xref: /openbmc/linux/drivers/tty/serial/serial_core.c (revision b289c496)
1e3b3d0f5SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0+
2ab4382d2SGreg Kroah-Hartman /*
3ab4382d2SGreg Kroah-Hartman  *  Driver core for serial ports
4ab4382d2SGreg Kroah-Hartman  *
5ab4382d2SGreg Kroah-Hartman  *  Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
6ab4382d2SGreg Kroah-Hartman  *
7ab4382d2SGreg Kroah-Hartman  *  Copyright 1999 ARM Limited
8ab4382d2SGreg Kroah-Hartman  *  Copyright (C) 2000-2001 Deep Blue Solutions Ltd.
9ab4382d2SGreg Kroah-Hartman  */
10ab4382d2SGreg Kroah-Hartman #include <linux/module.h>
11ab4382d2SGreg Kroah-Hartman #include <linux/tty.h>
12027d7dacSJiri Slaby #include <linux/tty_flip.h>
13ab4382d2SGreg Kroah-Hartman #include <linux/slab.h>
14174cd4b1SIngo Molnar #include <linux/sched/signal.h>
15ab4382d2SGreg Kroah-Hartman #include <linux/init.h>
16ab4382d2SGreg Kroah-Hartman #include <linux/console.h>
17a208ffd2SGrant Likely #include <linux/of.h>
18ab4382d2SGreg Kroah-Hartman #include <linux/proc_fs.h>
19ab4382d2SGreg Kroah-Hartman #include <linux/seq_file.h>
20ab4382d2SGreg Kroah-Hartman #include <linux/device.h>
21ab4382d2SGreg Kroah-Hartman #include <linux/serial.h> /* for serial_state and serial_icounter_struct */
22ab4382d2SGreg Kroah-Hartman #include <linux/serial_core.h>
23ab4382d2SGreg Kroah-Hartman #include <linux/delay.h>
24ab4382d2SGreg Kroah-Hartman #include <linux/mutex.h>
25ab4382d2SGreg Kroah-Hartman 
26aef3ad10SAndy Shevchenko #include <linux/irq.h>
277c0f6ba6SLinus Torvalds #include <linux/uaccess.h>
28ab4382d2SGreg Kroah-Hartman 
29ab4382d2SGreg Kroah-Hartman /*
30ab4382d2SGreg Kroah-Hartman  * This is used to lock changes in serial line configuration.
31ab4382d2SGreg Kroah-Hartman  */
32ab4382d2SGreg Kroah-Hartman static DEFINE_MUTEX(port_mutex);
33ab4382d2SGreg Kroah-Hartman 
34ab4382d2SGreg Kroah-Hartman /*
35ab4382d2SGreg Kroah-Hartman  * lockdep: port->lock is initialized in two places, but we
36ab4382d2SGreg Kroah-Hartman  *          want only one lock-class:
37ab4382d2SGreg Kroah-Hartman  */
38ab4382d2SGreg Kroah-Hartman static struct lock_class_key port_lock_key;
39ab4382d2SGreg Kroah-Hartman 
40ab4382d2SGreg Kroah-Hartman #define HIGH_BITS_OFFSET	((sizeof(long)-sizeof(int))*8)
41ab4382d2SGreg Kroah-Hartman 
42ab4382d2SGreg Kroah-Hartman static void uart_change_speed(struct tty_struct *tty, struct uart_state *state,
43ab4382d2SGreg Kroah-Hartman 					struct ktermios *old_termios);
441f33a51dSJiri Slaby static void uart_wait_until_sent(struct tty_struct *tty, int timeout);
456f538fe3SLinus Walleij static void uart_change_pm(struct uart_state *state,
466f538fe3SLinus Walleij 			   enum uart_pm_state pm_state);
47ab4382d2SGreg Kroah-Hartman 
48b922e19dSJiri Slaby static void uart_port_shutdown(struct tty_port *port);
49b922e19dSJiri Slaby 
50299245a1SPeter Hurley static int uart_dcd_enabled(struct uart_port *uport)
51299245a1SPeter Hurley {
52d4260b51SPeter Hurley 	return !!(uport->status & UPSTAT_DCD_ENABLE);
53299245a1SPeter Hurley }
54299245a1SPeter Hurley 
559ed19428SPeter Hurley static inline struct uart_port *uart_port_ref(struct uart_state *state)
569ed19428SPeter Hurley {
579ed19428SPeter Hurley 	if (atomic_add_unless(&state->refcount, 1, 0))
589ed19428SPeter Hurley 		return state->uart_port;
599ed19428SPeter Hurley 	return NULL;
609ed19428SPeter Hurley }
619ed19428SPeter Hurley 
629ed19428SPeter Hurley static inline void uart_port_deref(struct uart_port *uport)
639ed19428SPeter Hurley {
64ef510beaSAndy Shevchenko 	if (atomic_dec_and_test(&uport->state->refcount))
659ed19428SPeter Hurley 		wake_up(&uport->state->remove_wait);
669ed19428SPeter Hurley }
679ed19428SPeter Hurley 
689ed19428SPeter Hurley #define uart_port_lock(state, flags)					\
699ed19428SPeter Hurley 	({								\
709ed19428SPeter Hurley 		struct uart_port *__uport = uart_port_ref(state);	\
719ed19428SPeter Hurley 		if (__uport)						\
729ed19428SPeter Hurley 			spin_lock_irqsave(&__uport->lock, flags);	\
739ed19428SPeter Hurley 		__uport;						\
749ed19428SPeter Hurley 	})
759ed19428SPeter Hurley 
769ed19428SPeter Hurley #define uart_port_unlock(uport, flags)					\
779ed19428SPeter Hurley 	({								\
789ed19428SPeter Hurley 		struct uart_port *__uport = uport;			\
79ef510beaSAndy Shevchenko 		if (__uport) {						\
809ed19428SPeter Hurley 			spin_unlock_irqrestore(&__uport->lock, flags);	\
819ed19428SPeter Hurley 			uart_port_deref(__uport);			\
82ef510beaSAndy Shevchenko 		}							\
839ed19428SPeter Hurley 	})
849ed19428SPeter Hurley 
854047b371SPeter Hurley static inline struct uart_port *uart_port_check(struct uart_state *state)
864047b371SPeter Hurley {
877da4b8b7SPeter Hurley 	lockdep_assert_held(&state->port.mutex);
884047b371SPeter Hurley 	return state->uart_port;
894047b371SPeter Hurley }
904047b371SPeter Hurley 
91ab4382d2SGreg Kroah-Hartman /*
92ab4382d2SGreg Kroah-Hartman  * This routine is used by the interrupt handler to schedule processing in
93ab4382d2SGreg Kroah-Hartman  * the software interrupt portion of the driver.
94ab4382d2SGreg Kroah-Hartman  */
95ab4382d2SGreg Kroah-Hartman void uart_write_wakeup(struct uart_port *port)
96ab4382d2SGreg Kroah-Hartman {
97ab4382d2SGreg Kroah-Hartman 	struct uart_state *state = port->state;
98ab4382d2SGreg Kroah-Hartman 	/*
99ab4382d2SGreg Kroah-Hartman 	 * This means you called this function _after_ the port was
100ab4382d2SGreg Kroah-Hartman 	 * closed.  No cookie for you.
101ab4382d2SGreg Kroah-Hartman 	 */
102ab4382d2SGreg Kroah-Hartman 	BUG_ON(!state);
103d0f4bce2SRob Herring 	tty_port_tty_wakeup(&state->port);
104ab4382d2SGreg Kroah-Hartman }
105ab4382d2SGreg Kroah-Hartman 
106ab4382d2SGreg Kroah-Hartman static void uart_stop(struct tty_struct *tty)
107ab4382d2SGreg Kroah-Hartman {
108ab4382d2SGreg Kroah-Hartman 	struct uart_state *state = tty->driver_data;
1099ed19428SPeter Hurley 	struct uart_port *port;
110ab4382d2SGreg Kroah-Hartman 	unsigned long flags;
111ab4382d2SGreg Kroah-Hartman 
1129ed19428SPeter Hurley 	port = uart_port_lock(state, flags);
1139ed19428SPeter Hurley 	if (port)
114ab4382d2SGreg Kroah-Hartman 		port->ops->stop_tx(port);
1159ed19428SPeter Hurley 	uart_port_unlock(port, flags);
116ab4382d2SGreg Kroah-Hartman }
117ab4382d2SGreg Kroah-Hartman 
118ab4382d2SGreg Kroah-Hartman static void __uart_start(struct tty_struct *tty)
119ab4382d2SGreg Kroah-Hartman {
120ab4382d2SGreg Kroah-Hartman 	struct uart_state *state = tty->driver_data;
121ab4382d2SGreg Kroah-Hartman 	struct uart_port *port = state->uart_port;
122ab4382d2SGreg Kroah-Hartman 
1239ed19428SPeter Hurley 	if (port && !uart_tx_stopped(port))
124ab4382d2SGreg Kroah-Hartman 		port->ops->start_tx(port);
125ab4382d2SGreg Kroah-Hartman }
126ab4382d2SGreg Kroah-Hartman 
127ab4382d2SGreg Kroah-Hartman static void uart_start(struct tty_struct *tty)
128ab4382d2SGreg Kroah-Hartman {
129ab4382d2SGreg Kroah-Hartman 	struct uart_state *state = tty->driver_data;
1309ed19428SPeter Hurley 	struct uart_port *port;
131ab4382d2SGreg Kroah-Hartman 	unsigned long flags;
132ab4382d2SGreg Kroah-Hartman 
133fedb5760SGreg Kroah-Hartman 	if (!state)
134fedb5760SGreg Kroah-Hartman 		return;
135fedb5760SGreg Kroah-Hartman 
1369ed19428SPeter Hurley 	port = uart_port_lock(state, flags);
137ab4382d2SGreg Kroah-Hartman 	__uart_start(tty);
1389ed19428SPeter Hurley 	uart_port_unlock(port, flags);
139ab4382d2SGreg Kroah-Hartman }
140ab4382d2SGreg Kroah-Hartman 
141f4581cabSDenys Vlasenko static void
142ab4382d2SGreg Kroah-Hartman uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear)
143ab4382d2SGreg Kroah-Hartman {
144ab4382d2SGreg Kroah-Hartman 	unsigned long flags;
145ab4382d2SGreg Kroah-Hartman 	unsigned int old;
146ab4382d2SGreg Kroah-Hartman 
147ab4382d2SGreg Kroah-Hartman 	spin_lock_irqsave(&port->lock, flags);
148ab4382d2SGreg Kroah-Hartman 	old = port->mctrl;
149ab4382d2SGreg Kroah-Hartman 	port->mctrl = (old & ~clear) | set;
150ab4382d2SGreg Kroah-Hartman 	if (old != port->mctrl)
151ab4382d2SGreg Kroah-Hartman 		port->ops->set_mctrl(port, port->mctrl);
152ab4382d2SGreg Kroah-Hartman 	spin_unlock_irqrestore(&port->lock, flags);
153ab4382d2SGreg Kroah-Hartman }
154ab4382d2SGreg Kroah-Hartman 
155ab4382d2SGreg Kroah-Hartman #define uart_set_mctrl(port, set)	uart_update_mctrl(port, set, 0)
156ab4382d2SGreg Kroah-Hartman #define uart_clear_mctrl(port, clear)	uart_update_mctrl(port, 0, clear)
157ab4382d2SGreg Kroah-Hartman 
158a6845e1eSRafael Gago static void uart_port_dtr_rts(struct uart_port *uport, int raise)
159a6845e1eSRafael Gago {
160a6845e1eSRafael Gago 	int rs485_on = uport->rs485_config &&
161a6845e1eSRafael Gago 		(uport->rs485.flags & SER_RS485_ENABLED);
162a6845e1eSRafael Gago 	int RTS_after_send = !!(uport->rs485.flags & SER_RS485_RTS_AFTER_SEND);
163a6845e1eSRafael Gago 
164a6845e1eSRafael Gago 	if (raise) {
165a6845e1eSRafael Gago 		if (rs485_on && !RTS_after_send) {
166a6845e1eSRafael Gago 			uart_set_mctrl(uport, TIOCM_DTR);
167a6845e1eSRafael Gago 			uart_clear_mctrl(uport, TIOCM_RTS);
168a6845e1eSRafael Gago 		} else {
169a6845e1eSRafael Gago 			uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS);
170a6845e1eSRafael Gago 		}
171a6845e1eSRafael Gago 	} else {
172a6845e1eSRafael Gago 		unsigned int clear = TIOCM_DTR;
173a6845e1eSRafael Gago 
174a6845e1eSRafael Gago 		clear |= (!rs485_on || !RTS_after_send) ? TIOCM_RTS : 0;
175a6845e1eSRafael Gago 		uart_clear_mctrl(uport, clear);
176a6845e1eSRafael Gago 	}
177a6845e1eSRafael Gago }
178a6845e1eSRafael Gago 
179ab4382d2SGreg Kroah-Hartman /*
180ab4382d2SGreg Kroah-Hartman  * Startup the port.  This will be called once per open.  All calls
181ab4382d2SGreg Kroah-Hartman  * will be serialised by the per-port mutex.
182ab4382d2SGreg Kroah-Hartman  */
183c0d92be6SJiri Slaby static int uart_port_startup(struct tty_struct *tty, struct uart_state *state,
184c0d92be6SJiri Slaby 		int init_hw)
185ab4382d2SGreg Kroah-Hartman {
1864047b371SPeter Hurley 	struct uart_port *uport = uart_port_check(state);
187ab4382d2SGreg Kroah-Hartman 	unsigned long page;
188a5ba1d95STycho Andersen 	unsigned long flags = 0;
189ab4382d2SGreg Kroah-Hartman 	int retval = 0;
190ab4382d2SGreg Kroah-Hartman 
191ab4382d2SGreg Kroah-Hartman 	if (uport->type == PORT_UNKNOWN)
192c0d92be6SJiri Slaby 		return 1;
193ab4382d2SGreg Kroah-Hartman 
194ab4382d2SGreg Kroah-Hartman 	/*
1957deb39edSThomas Pfaff 	 * Make sure the device is in D0 state.
1967deb39edSThomas Pfaff 	 */
1977deb39edSThomas Pfaff 	uart_change_pm(state, UART_PM_STATE_ON);
1987deb39edSThomas Pfaff 
1997deb39edSThomas Pfaff 	/*
200ab4382d2SGreg Kroah-Hartman 	 * Initialise and allocate the transmit and temporary
201ab4382d2SGreg Kroah-Hartman 	 * buffer.
202ab4382d2SGreg Kroah-Hartman 	 */
203ab4382d2SGreg Kroah-Hartman 	page = get_zeroed_page(GFP_KERNEL);
204ab4382d2SGreg Kroah-Hartman 	if (!page)
205ab4382d2SGreg Kroah-Hartman 		return -ENOMEM;
206ab4382d2SGreg Kroah-Hartman 
207a5ba1d95STycho Andersen 	uart_port_lock(state, flags);
208a5ba1d95STycho Andersen 	if (!state->xmit.buf) {
209ab4382d2SGreg Kroah-Hartman 		state->xmit.buf = (unsigned char *) page;
210ab4382d2SGreg Kroah-Hartman 		uart_circ_clear(&state->xmit);
211d7240214SSergey Senozhatsky 		uart_port_unlock(uport, flags);
212a5ba1d95STycho Andersen 	} else {
213d7240214SSergey Senozhatsky 		uart_port_unlock(uport, flags);
214d7240214SSergey Senozhatsky 		/*
215d7240214SSergey Senozhatsky 		 * Do not free() the page under the port lock, see
216d7240214SSergey Senozhatsky 		 * uart_shutdown().
217d7240214SSergey Senozhatsky 		 */
218a5ba1d95STycho Andersen 		free_page(page);
219ab4382d2SGreg Kroah-Hartman 	}
220ab4382d2SGreg Kroah-Hartman 
221ab4382d2SGreg Kroah-Hartman 	retval = uport->ops->startup(uport);
222ab4382d2SGreg Kroah-Hartman 	if (retval == 0) {
223c7d7abffSJiri Slaby 		if (uart_console(uport) && uport->cons->cflag) {
224adc8d746SAlan Cox 			tty->termios.c_cflag = uport->cons->cflag;
225c7d7abffSJiri Slaby 			uport->cons->cflag = 0;
226c7d7abffSJiri Slaby 		}
227ab4382d2SGreg Kroah-Hartman 		/*
228ab4382d2SGreg Kroah-Hartman 		 * Initialise the hardware port settings.
229ab4382d2SGreg Kroah-Hartman 		 */
230ab4382d2SGreg Kroah-Hartman 		uart_change_speed(tty, state, NULL);
231ab4382d2SGreg Kroah-Hartman 
232ab4382d2SGreg Kroah-Hartman 		/*
233ab4382d2SGreg Kroah-Hartman 		 * Setup the RTS and DTR signals once the
234ab4382d2SGreg Kroah-Hartman 		 * port is open and ready to respond.
235ab4382d2SGreg Kroah-Hartman 		 */
2369db276f8SPeter Hurley 		if (init_hw && C_BAUD(tty))
237a6845e1eSRafael Gago 			uart_port_dtr_rts(uport, 1);
238ab4382d2SGreg Kroah-Hartman 	}
239ab4382d2SGreg Kroah-Hartman 
2400055197eSJiri Slaby 	/*
2410055197eSJiri Slaby 	 * This is to allow setserial on this port. People may want to set
2420055197eSJiri Slaby 	 * port/irq/type and then reconfigure the port properly if it failed
2430055197eSJiri Slaby 	 * now.
2440055197eSJiri Slaby 	 */
245ab4382d2SGreg Kroah-Hartman 	if (retval && capable(CAP_SYS_ADMIN))
246c0d92be6SJiri Slaby 		return 1;
247c0d92be6SJiri Slaby 
248c0d92be6SJiri Slaby 	return retval;
249c0d92be6SJiri Slaby }
250c0d92be6SJiri Slaby 
251c0d92be6SJiri Slaby static int uart_startup(struct tty_struct *tty, struct uart_state *state,
252c0d92be6SJiri Slaby 		int init_hw)
253c0d92be6SJiri Slaby {
254c0d92be6SJiri Slaby 	struct tty_port *port = &state->port;
255c0d92be6SJiri Slaby 	int retval;
256c0d92be6SJiri Slaby 
257d41861caSPeter Hurley 	if (tty_port_initialized(port))
258c0d92be6SJiri Slaby 		return 0;
259c0d92be6SJiri Slaby 
260c0d92be6SJiri Slaby 	retval = uart_port_startup(tty, state, init_hw);
261b3b57646SRob Herring 	if (retval)
262b3b57646SRob Herring 		set_bit(TTY_IO_ERROR, &tty->flags);
263ab4382d2SGreg Kroah-Hartman 
264ab4382d2SGreg Kroah-Hartman 	return retval;
265ab4382d2SGreg Kroah-Hartman }
266ab4382d2SGreg Kroah-Hartman 
267ab4382d2SGreg Kroah-Hartman /*
268ab4382d2SGreg Kroah-Hartman  * This routine will shutdown a serial port; interrupts are disabled, and
269ab4382d2SGreg Kroah-Hartman  * DTR is dropped if the hangup on close termio flag is on.  Calls to
270ab4382d2SGreg Kroah-Hartman  * uart_shutdown are serialised by the per-port semaphore.
271af224ca2SPeter Hurley  *
272af224ca2SPeter Hurley  * uport == NULL if uart_port has already been removed
273ab4382d2SGreg Kroah-Hartman  */
274ab4382d2SGreg Kroah-Hartman static void uart_shutdown(struct tty_struct *tty, struct uart_state *state)
275ab4382d2SGreg Kroah-Hartman {
2764047b371SPeter Hurley 	struct uart_port *uport = uart_port_check(state);
277ab4382d2SGreg Kroah-Hartman 	struct tty_port *port = &state->port;
278a5ba1d95STycho Andersen 	unsigned long flags = 0;
279d7240214SSergey Senozhatsky 	char *xmit_buf = NULL;
280ab4382d2SGreg Kroah-Hartman 
281ab4382d2SGreg Kroah-Hartman 	/*
282ab4382d2SGreg Kroah-Hartman 	 * Set the TTY IO error marker
283ab4382d2SGreg Kroah-Hartman 	 */
284ab4382d2SGreg Kroah-Hartman 	if (tty)
285ab4382d2SGreg Kroah-Hartman 		set_bit(TTY_IO_ERROR, &tty->flags);
286ab4382d2SGreg Kroah-Hartman 
287d41861caSPeter Hurley 	if (tty_port_initialized(port)) {
288d41861caSPeter Hurley 		tty_port_set_initialized(port, 0);
289d41861caSPeter Hurley 
290ab4382d2SGreg Kroah-Hartman 		/*
291ab4382d2SGreg Kroah-Hartman 		 * Turn off DTR and RTS early.
292ab4382d2SGreg Kroah-Hartman 		 */
293af224ca2SPeter Hurley 		if (uport && uart_console(uport) && tty)
294ae84db96SPeter Hurley 			uport->cons->cflag = tty->termios.c_cflag;
295ae84db96SPeter Hurley 
2969db276f8SPeter Hurley 		if (!tty || C_HUPCL(tty))
297a6845e1eSRafael Gago 			uart_port_dtr_rts(uport, 0);
298ab4382d2SGreg Kroah-Hartman 
299b922e19dSJiri Slaby 		uart_port_shutdown(port);
300ab4382d2SGreg Kroah-Hartman 	}
301ab4382d2SGreg Kroah-Hartman 
302ab4382d2SGreg Kroah-Hartman 	/*
303d208a3bfSDoug Anderson 	 * It's possible for shutdown to be called after suspend if we get
304d208a3bfSDoug Anderson 	 * a DCD drop (hangup) at just the right time.  Clear suspended bit so
305d208a3bfSDoug Anderson 	 * we don't try to resume a port that has been shutdown.
306ab4382d2SGreg Kroah-Hartman 	 */
30780f02d54SPeter Hurley 	tty_port_set_suspended(port, 0);
308ab4382d2SGreg Kroah-Hartman 
309ab4382d2SGreg Kroah-Hartman 	/*
310d7240214SSergey Senozhatsky 	 * Do not free() the transmit buffer page under the port lock since
311d7240214SSergey Senozhatsky 	 * this can create various circular locking scenarios. For instance,
312d7240214SSergey Senozhatsky 	 * console driver may need to allocate/free a debug object, which
313d7240214SSergey Senozhatsky 	 * can endup in printk() recursion.
314ab4382d2SGreg Kroah-Hartman 	 */
315a5ba1d95STycho Andersen 	uart_port_lock(state, flags);
316d7240214SSergey Senozhatsky 	xmit_buf = state->xmit.buf;
317ab4382d2SGreg Kroah-Hartman 	state->xmit.buf = NULL;
318a5ba1d95STycho Andersen 	uart_port_unlock(uport, flags);
319d7240214SSergey Senozhatsky 
320d7240214SSergey Senozhatsky 	if (xmit_buf)
321d7240214SSergey Senozhatsky 		free_page((unsigned long)xmit_buf);
322ab4382d2SGreg Kroah-Hartman }
323ab4382d2SGreg Kroah-Hartman 
324ab4382d2SGreg Kroah-Hartman /**
325ab4382d2SGreg Kroah-Hartman  *	uart_update_timeout - update per-port FIFO timeout.
326ab4382d2SGreg Kroah-Hartman  *	@port:  uart_port structure describing the port
327ab4382d2SGreg Kroah-Hartman  *	@cflag: termios cflag value
328ab4382d2SGreg Kroah-Hartman  *	@baud:  speed of the port
329ab4382d2SGreg Kroah-Hartman  *
330ab4382d2SGreg Kroah-Hartman  *	Set the port FIFO timeout value.  The @cflag value should
331ab4382d2SGreg Kroah-Hartman  *	reflect the actual hardware settings.
332ab4382d2SGreg Kroah-Hartman  */
333ab4382d2SGreg Kroah-Hartman void
334ab4382d2SGreg Kroah-Hartman uart_update_timeout(struct uart_port *port, unsigned int cflag,
335ab4382d2SGreg Kroah-Hartman 		    unsigned int baud)
336ab4382d2SGreg Kroah-Hartman {
337ab4382d2SGreg Kroah-Hartman 	unsigned int bits;
338ab4382d2SGreg Kroah-Hartman 
339ab4382d2SGreg Kroah-Hartman 	/* byte size and parity */
340ab4382d2SGreg Kroah-Hartman 	switch (cflag & CSIZE) {
341ab4382d2SGreg Kroah-Hartman 	case CS5:
342ab4382d2SGreg Kroah-Hartman 		bits = 7;
343ab4382d2SGreg Kroah-Hartman 		break;
344ab4382d2SGreg Kroah-Hartman 	case CS6:
345ab4382d2SGreg Kroah-Hartman 		bits = 8;
346ab4382d2SGreg Kroah-Hartman 		break;
347ab4382d2SGreg Kroah-Hartman 	case CS7:
348ab4382d2SGreg Kroah-Hartman 		bits = 9;
349ab4382d2SGreg Kroah-Hartman 		break;
350ab4382d2SGreg Kroah-Hartman 	default:
351ab4382d2SGreg Kroah-Hartman 		bits = 10;
352ab4382d2SGreg Kroah-Hartman 		break; /* CS8 */
353ab4382d2SGreg Kroah-Hartman 	}
354ab4382d2SGreg Kroah-Hartman 
355ab4382d2SGreg Kroah-Hartman 	if (cflag & CSTOPB)
356ab4382d2SGreg Kroah-Hartman 		bits++;
357ab4382d2SGreg Kroah-Hartman 	if (cflag & PARENB)
358ab4382d2SGreg Kroah-Hartman 		bits++;
359ab4382d2SGreg Kroah-Hartman 
360ab4382d2SGreg Kroah-Hartman 	/*
361ab4382d2SGreg Kroah-Hartman 	 * The total number of bits to be transmitted in the fifo.
362ab4382d2SGreg Kroah-Hartman 	 */
363ab4382d2SGreg Kroah-Hartman 	bits = bits * port->fifosize;
364ab4382d2SGreg Kroah-Hartman 
365ab4382d2SGreg Kroah-Hartman 	/*
366ab4382d2SGreg Kroah-Hartman 	 * Figure the timeout to send the above number of bits.
367ab4382d2SGreg Kroah-Hartman 	 * Add .02 seconds of slop
368ab4382d2SGreg Kroah-Hartman 	 */
369ab4382d2SGreg Kroah-Hartman 	port->timeout = (HZ * bits) / baud + HZ/50;
370ab4382d2SGreg Kroah-Hartman }
371ab4382d2SGreg Kroah-Hartman 
372ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_update_timeout);
373ab4382d2SGreg Kroah-Hartman 
374ab4382d2SGreg Kroah-Hartman /**
375ab4382d2SGreg Kroah-Hartman  *	uart_get_baud_rate - return baud rate for a particular port
376ab4382d2SGreg Kroah-Hartman  *	@port: uart_port structure describing the port in question.
377ab4382d2SGreg Kroah-Hartman  *	@termios: desired termios settings.
378ab4382d2SGreg Kroah-Hartman  *	@old: old termios (or NULL)
379ab4382d2SGreg Kroah-Hartman  *	@min: minimum acceptable baud rate
380ab4382d2SGreg Kroah-Hartman  *	@max: maximum acceptable baud rate
381ab4382d2SGreg Kroah-Hartman  *
382ab4382d2SGreg Kroah-Hartman  *	Decode the termios structure into a numeric baud rate,
383ab4382d2SGreg Kroah-Hartman  *	taking account of the magic 38400 baud rate (with spd_*
384ab4382d2SGreg Kroah-Hartman  *	flags), and mapping the %B0 rate to 9600 baud.
385ab4382d2SGreg Kroah-Hartman  *
386ab4382d2SGreg Kroah-Hartman  *	If the new baud rate is invalid, try the old termios setting.
387ab4382d2SGreg Kroah-Hartman  *	If it's still invalid, we try 9600 baud.
388ab4382d2SGreg Kroah-Hartman  *
389ab4382d2SGreg Kroah-Hartman  *	Update the @termios structure to reflect the baud rate
390ab4382d2SGreg Kroah-Hartman  *	we're actually going to be using. Don't do this for the case
391ab4382d2SGreg Kroah-Hartman  *	where B0 is requested ("hang up").
392ab4382d2SGreg Kroah-Hartman  */
393ab4382d2SGreg Kroah-Hartman unsigned int
394ab4382d2SGreg Kroah-Hartman uart_get_baud_rate(struct uart_port *port, struct ktermios *termios,
395ab4382d2SGreg Kroah-Hartman 		   struct ktermios *old, unsigned int min, unsigned int max)
396ab4382d2SGreg Kroah-Hartman {
397f10a2233SJoakim Nordell 	unsigned int try;
398f10a2233SJoakim Nordell 	unsigned int baud;
399f10a2233SJoakim Nordell 	unsigned int altbaud;
400ab4382d2SGreg Kroah-Hartman 	int hung_up = 0;
401ab4382d2SGreg Kroah-Hartman 	upf_t flags = port->flags & UPF_SPD_MASK;
402ab4382d2SGreg Kroah-Hartman 
403f10a2233SJoakim Nordell 	switch (flags) {
404f10a2233SJoakim Nordell 	case UPF_SPD_HI:
405ab4382d2SGreg Kroah-Hartman 		altbaud = 57600;
406f10a2233SJoakim Nordell 		break;
407f10a2233SJoakim Nordell 	case UPF_SPD_VHI:
408ab4382d2SGreg Kroah-Hartman 		altbaud = 115200;
409f10a2233SJoakim Nordell 		break;
410f10a2233SJoakim Nordell 	case UPF_SPD_SHI:
411ab4382d2SGreg Kroah-Hartman 		altbaud = 230400;
412f10a2233SJoakim Nordell 		break;
413f10a2233SJoakim Nordell 	case UPF_SPD_WARP:
414ab4382d2SGreg Kroah-Hartman 		altbaud = 460800;
415f10a2233SJoakim Nordell 		break;
416f10a2233SJoakim Nordell 	default:
417f10a2233SJoakim Nordell 		altbaud = 38400;
418f10a2233SJoakim Nordell 		break;
419f10a2233SJoakim Nordell 	}
420ab4382d2SGreg Kroah-Hartman 
421ab4382d2SGreg Kroah-Hartman 	for (try = 0; try < 2; try++) {
422ab4382d2SGreg Kroah-Hartman 		baud = tty_termios_baud_rate(termios);
423ab4382d2SGreg Kroah-Hartman 
424ab4382d2SGreg Kroah-Hartman 		/*
425ab4382d2SGreg Kroah-Hartman 		 * The spd_hi, spd_vhi, spd_shi, spd_warp kludge...
426ab4382d2SGreg Kroah-Hartman 		 * Die! Die! Die!
427ab4382d2SGreg Kroah-Hartman 		 */
428547039ecSPeter Hurley 		if (try == 0 && baud == 38400)
429ab4382d2SGreg Kroah-Hartman 			baud = altbaud;
430ab4382d2SGreg Kroah-Hartman 
431ab4382d2SGreg Kroah-Hartman 		/*
432ab4382d2SGreg Kroah-Hartman 		 * Special case: B0 rate.
433ab4382d2SGreg Kroah-Hartman 		 */
434ab4382d2SGreg Kroah-Hartman 		if (baud == 0) {
435ab4382d2SGreg Kroah-Hartman 			hung_up = 1;
436ab4382d2SGreg Kroah-Hartman 			baud = 9600;
437ab4382d2SGreg Kroah-Hartman 		}
438ab4382d2SGreg Kroah-Hartman 
439ab4382d2SGreg Kroah-Hartman 		if (baud >= min && baud <= max)
440ab4382d2SGreg Kroah-Hartman 			return baud;
441ab4382d2SGreg Kroah-Hartman 
442ab4382d2SGreg Kroah-Hartman 		/*
443ab4382d2SGreg Kroah-Hartman 		 * Oops, the quotient was zero.  Try again with
444ab4382d2SGreg Kroah-Hartman 		 * the old baud rate if possible.
445ab4382d2SGreg Kroah-Hartman 		 */
446ab4382d2SGreg Kroah-Hartman 		termios->c_cflag &= ~CBAUD;
447ab4382d2SGreg Kroah-Hartman 		if (old) {
448ab4382d2SGreg Kroah-Hartman 			baud = tty_termios_baud_rate(old);
449ab4382d2SGreg Kroah-Hartman 			if (!hung_up)
450ab4382d2SGreg Kroah-Hartman 				tty_termios_encode_baud_rate(termios,
451ab4382d2SGreg Kroah-Hartman 								baud, baud);
452ab4382d2SGreg Kroah-Hartman 			old = NULL;
453ab4382d2SGreg Kroah-Hartman 			continue;
454ab4382d2SGreg Kroah-Hartman 		}
455ab4382d2SGreg Kroah-Hartman 
456ab4382d2SGreg Kroah-Hartman 		/*
457ab4382d2SGreg Kroah-Hartman 		 * As a last resort, if the range cannot be met then clip to
458ab4382d2SGreg Kroah-Hartman 		 * the nearest chip supported rate.
459ab4382d2SGreg Kroah-Hartman 		 */
460ab4382d2SGreg Kroah-Hartman 		if (!hung_up) {
461ab4382d2SGreg Kroah-Hartman 			if (baud <= min)
462ab4382d2SGreg Kroah-Hartman 				tty_termios_encode_baud_rate(termios,
463ab4382d2SGreg Kroah-Hartman 							min + 1, min + 1);
464ab4382d2SGreg Kroah-Hartman 			else
465ab4382d2SGreg Kroah-Hartman 				tty_termios_encode_baud_rate(termios,
466ab4382d2SGreg Kroah-Hartman 							max - 1, max - 1);
467ab4382d2SGreg Kroah-Hartman 		}
468ab4382d2SGreg Kroah-Hartman 	}
469ab4382d2SGreg Kroah-Hartman 	/* Should never happen */
470ab4382d2SGreg Kroah-Hartman 	WARN_ON(1);
471ab4382d2SGreg Kroah-Hartman 	return 0;
472ab4382d2SGreg Kroah-Hartman }
473ab4382d2SGreg Kroah-Hartman 
474ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_get_baud_rate);
475ab4382d2SGreg Kroah-Hartman 
476ab4382d2SGreg Kroah-Hartman /**
477ab4382d2SGreg Kroah-Hartman  *	uart_get_divisor - return uart clock divisor
478ab4382d2SGreg Kroah-Hartman  *	@port: uart_port structure describing the port.
479ab4382d2SGreg Kroah-Hartman  *	@baud: desired baud rate
480ab4382d2SGreg Kroah-Hartman  *
481ab4382d2SGreg Kroah-Hartman  *	Calculate the uart clock divisor for the port.
482ab4382d2SGreg Kroah-Hartman  */
483ab4382d2SGreg Kroah-Hartman unsigned int
484ab4382d2SGreg Kroah-Hartman uart_get_divisor(struct uart_port *port, unsigned int baud)
485ab4382d2SGreg Kroah-Hartman {
486ab4382d2SGreg Kroah-Hartman 	unsigned int quot;
487ab4382d2SGreg Kroah-Hartman 
488ab4382d2SGreg Kroah-Hartman 	/*
489ab4382d2SGreg Kroah-Hartman 	 * Old custom speed handling.
490ab4382d2SGreg Kroah-Hartman 	 */
491ab4382d2SGreg Kroah-Hartman 	if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST)
492ab4382d2SGreg Kroah-Hartman 		quot = port->custom_divisor;
493ab4382d2SGreg Kroah-Hartman 	else
49497d24634SUwe Kleine-König 		quot = DIV_ROUND_CLOSEST(port->uartclk, 16 * baud);
495ab4382d2SGreg Kroah-Hartman 
496ab4382d2SGreg Kroah-Hartman 	return quot;
497ab4382d2SGreg Kroah-Hartman }
498ab4382d2SGreg Kroah-Hartman 
499ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_get_divisor);
500ab4382d2SGreg Kroah-Hartman 
5017c8ab967SPeter Hurley /* Caller holds port mutex */
502ab4382d2SGreg Kroah-Hartman static void uart_change_speed(struct tty_struct *tty, struct uart_state *state,
503ab4382d2SGreg Kroah-Hartman 					struct ktermios *old_termios)
504ab4382d2SGreg Kroah-Hartman {
5054047b371SPeter Hurley 	struct uart_port *uport = uart_port_check(state);
506ab4382d2SGreg Kroah-Hartman 	struct ktermios *termios;
507391f93f2SPeter Hurley 	int hw_stopped;
508ab4382d2SGreg Kroah-Hartman 
509ab4382d2SGreg Kroah-Hartman 	/*
510ab4382d2SGreg Kroah-Hartman 	 * If we have no tty, termios, or the port does not exist,
511ab4382d2SGreg Kroah-Hartman 	 * then we can't set the parameters for this port.
512ab4382d2SGreg Kroah-Hartman 	 */
513adc8d746SAlan Cox 	if (!tty || uport->type == PORT_UNKNOWN)
514ab4382d2SGreg Kroah-Hartman 		return;
515ab4382d2SGreg Kroah-Hartman 
516adc8d746SAlan Cox 	termios = &tty->termios;
517c18b55fdSPeter Hurley 	uport->ops->set_termios(uport, termios, old_termios);
518ab4382d2SGreg Kroah-Hartman 
519ab4382d2SGreg Kroah-Hartman 	/*
520299245a1SPeter Hurley 	 * Set modem status enables based on termios cflag
521ab4382d2SGreg Kroah-Hartman 	 */
522299245a1SPeter Hurley 	spin_lock_irq(&uport->lock);
523ab4382d2SGreg Kroah-Hartman 	if (termios->c_cflag & CRTSCTS)
524299245a1SPeter Hurley 		uport->status |= UPSTAT_CTS_ENABLE;
525ab4382d2SGreg Kroah-Hartman 	else
526299245a1SPeter Hurley 		uport->status &= ~UPSTAT_CTS_ENABLE;
527ab4382d2SGreg Kroah-Hartman 
528ab4382d2SGreg Kroah-Hartman 	if (termios->c_cflag & CLOCAL)
529299245a1SPeter Hurley 		uport->status &= ~UPSTAT_DCD_ENABLE;
530ab4382d2SGreg Kroah-Hartman 	else
531299245a1SPeter Hurley 		uport->status |= UPSTAT_DCD_ENABLE;
532391f93f2SPeter Hurley 
533391f93f2SPeter Hurley 	/* reset sw-assisted CTS flow control based on (possibly) new mode */
534391f93f2SPeter Hurley 	hw_stopped = uport->hw_stopped;
535391f93f2SPeter Hurley 	uport->hw_stopped = uart_softcts_mode(uport) &&
536391f93f2SPeter Hurley 				!(uport->ops->get_mctrl(uport) & TIOCM_CTS);
537391f93f2SPeter Hurley 	if (uport->hw_stopped) {
538391f93f2SPeter Hurley 		if (!hw_stopped)
539391f93f2SPeter Hurley 			uport->ops->stop_tx(uport);
540391f93f2SPeter Hurley 	} else {
541391f93f2SPeter Hurley 		if (hw_stopped)
542391f93f2SPeter Hurley 			__uart_start(tty);
543391f93f2SPeter Hurley 	}
544299245a1SPeter Hurley 	spin_unlock_irq(&uport->lock);
545ab4382d2SGreg Kroah-Hartman }
546ab4382d2SGreg Kroah-Hartman 
547f5291eccSPeter Hurley static int uart_put_char(struct tty_struct *tty, unsigned char c)
548ab4382d2SGreg Kroah-Hartman {
549f5291eccSPeter Hurley 	struct uart_state *state = tty->driver_data;
5509ed19428SPeter Hurley 	struct uart_port *port;
551f5291eccSPeter Hurley 	struct circ_buf *circ;
552ab4382d2SGreg Kroah-Hartman 	unsigned long flags;
553ab4382d2SGreg Kroah-Hartman 	int ret = 0;
554ab4382d2SGreg Kroah-Hartman 
555f5291eccSPeter Hurley 	circ = &state->xmit;
5569ed19428SPeter Hurley 	port = uart_port_lock(state, flags);
557aff9cf59SSamir Virmani 	if (!circ->buf) {
558aff9cf59SSamir Virmani 		uart_port_unlock(port, flags);
559aff9cf59SSamir Virmani 		return 0;
560aff9cf59SSamir Virmani 	}
561aff9cf59SSamir Virmani 
5629ed19428SPeter Hurley 	if (port && uart_circ_chars_free(circ) != 0) {
563ab4382d2SGreg Kroah-Hartman 		circ->buf[circ->head] = c;
564ab4382d2SGreg Kroah-Hartman 		circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1);
565ab4382d2SGreg Kroah-Hartman 		ret = 1;
566ab4382d2SGreg Kroah-Hartman 	}
5679ed19428SPeter Hurley 	uart_port_unlock(port, flags);
568ab4382d2SGreg Kroah-Hartman 	return ret;
569ab4382d2SGreg Kroah-Hartman }
570ab4382d2SGreg Kroah-Hartman 
571ab4382d2SGreg Kroah-Hartman static void uart_flush_chars(struct tty_struct *tty)
572ab4382d2SGreg Kroah-Hartman {
573ab4382d2SGreg Kroah-Hartman 	uart_start(tty);
574ab4382d2SGreg Kroah-Hartman }
575ab4382d2SGreg Kroah-Hartman 
576ab4382d2SGreg Kroah-Hartman static int uart_write(struct tty_struct *tty,
577ab4382d2SGreg Kroah-Hartman 					const unsigned char *buf, int count)
578ab4382d2SGreg Kroah-Hartman {
579ab4382d2SGreg Kroah-Hartman 	struct uart_state *state = tty->driver_data;
580ab4382d2SGreg Kroah-Hartman 	struct uart_port *port;
581ab4382d2SGreg Kroah-Hartman 	struct circ_buf *circ;
582ab4382d2SGreg Kroah-Hartman 	unsigned long flags;
583ab4382d2SGreg Kroah-Hartman 	int c, ret = 0;
584ab4382d2SGreg Kroah-Hartman 
585ab4382d2SGreg Kroah-Hartman 	/*
586ab4382d2SGreg Kroah-Hartman 	 * This means you called this function _after_ the port was
587ab4382d2SGreg Kroah-Hartman 	 * closed.  No cookie for you.
588ab4382d2SGreg Kroah-Hartman 	 */
589ab4382d2SGreg Kroah-Hartman 	if (!state) {
590ab4382d2SGreg Kroah-Hartman 		WARN_ON(1);
591ab4382d2SGreg Kroah-Hartman 		return -EL3HLT;
592ab4382d2SGreg Kroah-Hartman 	}
593ab4382d2SGreg Kroah-Hartman 
5949ed19428SPeter Hurley 	port = uart_port_lock(state, flags);
595aff9cf59SSamir Virmani 	circ = &state->xmit;
596aff9cf59SSamir Virmani 	if (!circ->buf) {
597aff9cf59SSamir Virmani 		uart_port_unlock(port, flags);
598aff9cf59SSamir Virmani 		return 0;
599aff9cf59SSamir Virmani 	}
600aff9cf59SSamir Virmani 
6019ed19428SPeter Hurley 	while (port) {
602ab4382d2SGreg Kroah-Hartman 		c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE);
603ab4382d2SGreg Kroah-Hartman 		if (count < c)
604ab4382d2SGreg Kroah-Hartman 			c = count;
605ab4382d2SGreg Kroah-Hartman 		if (c <= 0)
606ab4382d2SGreg Kroah-Hartman 			break;
607ab4382d2SGreg Kroah-Hartman 		memcpy(circ->buf + circ->head, buf, c);
608ab4382d2SGreg Kroah-Hartman 		circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1);
609ab4382d2SGreg Kroah-Hartman 		buf += c;
610ab4382d2SGreg Kroah-Hartman 		count -= c;
611ab4382d2SGreg Kroah-Hartman 		ret += c;
612ab4382d2SGreg Kroah-Hartman 	}
61364dbee31SPeter Hurley 
61464dbee31SPeter Hurley 	__uart_start(tty);
6159ed19428SPeter Hurley 	uart_port_unlock(port, flags);
616ab4382d2SGreg Kroah-Hartman 	return ret;
617ab4382d2SGreg Kroah-Hartman }
618ab4382d2SGreg Kroah-Hartman 
619ab4382d2SGreg Kroah-Hartman static int uart_write_room(struct tty_struct *tty)
620ab4382d2SGreg Kroah-Hartman {
621ab4382d2SGreg Kroah-Hartman 	struct uart_state *state = tty->driver_data;
6229ed19428SPeter Hurley 	struct uart_port *port;
623ab4382d2SGreg Kroah-Hartman 	unsigned long flags;
624ab4382d2SGreg Kroah-Hartman 	int ret;
625ab4382d2SGreg Kroah-Hartman 
6269ed19428SPeter Hurley 	port = uart_port_lock(state, flags);
627ab4382d2SGreg Kroah-Hartman 	ret = uart_circ_chars_free(&state->xmit);
6289ed19428SPeter Hurley 	uart_port_unlock(port, flags);
629ab4382d2SGreg Kroah-Hartman 	return ret;
630ab4382d2SGreg Kroah-Hartman }
631ab4382d2SGreg Kroah-Hartman 
632ab4382d2SGreg Kroah-Hartman static int uart_chars_in_buffer(struct tty_struct *tty)
633ab4382d2SGreg Kroah-Hartman {
634ab4382d2SGreg Kroah-Hartman 	struct uart_state *state = tty->driver_data;
6359ed19428SPeter Hurley 	struct uart_port *port;
636ab4382d2SGreg Kroah-Hartman 	unsigned long flags;
637ab4382d2SGreg Kroah-Hartman 	int ret;
638ab4382d2SGreg Kroah-Hartman 
6399ed19428SPeter Hurley 	port = uart_port_lock(state, flags);
640ab4382d2SGreg Kroah-Hartman 	ret = uart_circ_chars_pending(&state->xmit);
6419ed19428SPeter Hurley 	uart_port_unlock(port, flags);
642ab4382d2SGreg Kroah-Hartman 	return ret;
643ab4382d2SGreg Kroah-Hartman }
644ab4382d2SGreg Kroah-Hartman 
645ab4382d2SGreg Kroah-Hartman static void uart_flush_buffer(struct tty_struct *tty)
646ab4382d2SGreg Kroah-Hartman {
647ab4382d2SGreg Kroah-Hartman 	struct uart_state *state = tty->driver_data;
648ab4382d2SGreg Kroah-Hartman 	struct uart_port *port;
649ab4382d2SGreg Kroah-Hartman 	unsigned long flags;
650ab4382d2SGreg Kroah-Hartman 
651ab4382d2SGreg Kroah-Hartman 	/*
652ab4382d2SGreg Kroah-Hartman 	 * This means you called this function _after_ the port was
653ab4382d2SGreg Kroah-Hartman 	 * closed.  No cookie for you.
654ab4382d2SGreg Kroah-Hartman 	 */
655ab4382d2SGreg Kroah-Hartman 	if (!state) {
656ab4382d2SGreg Kroah-Hartman 		WARN_ON(1);
657ab4382d2SGreg Kroah-Hartman 		return;
658ab4382d2SGreg Kroah-Hartman 	}
659ab4382d2SGreg Kroah-Hartman 
660ab4382d2SGreg Kroah-Hartman 	pr_debug("uart_flush_buffer(%d) called\n", tty->index);
661ab4382d2SGreg Kroah-Hartman 
6629ed19428SPeter Hurley 	port = uart_port_lock(state, flags);
6639ed19428SPeter Hurley 	if (!port)
6649ed19428SPeter Hurley 		return;
665ab4382d2SGreg Kroah-Hartman 	uart_circ_clear(&state->xmit);
666ab4382d2SGreg Kroah-Hartman 	if (port->ops->flush_buffer)
667ab4382d2SGreg Kroah-Hartman 		port->ops->flush_buffer(port);
6689ed19428SPeter Hurley 	uart_port_unlock(port, flags);
669d0f4bce2SRob Herring 	tty_port_tty_wakeup(&state->port);
670ab4382d2SGreg Kroah-Hartman }
671ab4382d2SGreg Kroah-Hartman 
672ab4382d2SGreg Kroah-Hartman /*
673ab4382d2SGreg Kroah-Hartman  * This function is used to send a high-priority XON/XOFF character to
674ab4382d2SGreg Kroah-Hartman  * the device
675ab4382d2SGreg Kroah-Hartman  */
676ab4382d2SGreg Kroah-Hartman static void uart_send_xchar(struct tty_struct *tty, char ch)
677ab4382d2SGreg Kroah-Hartman {
678ab4382d2SGreg Kroah-Hartman 	struct uart_state *state = tty->driver_data;
6799ed19428SPeter Hurley 	struct uart_port *port;
680ab4382d2SGreg Kroah-Hartman 	unsigned long flags;
681ab4382d2SGreg Kroah-Hartman 
6829ed19428SPeter Hurley 	port = uart_port_ref(state);
6839ed19428SPeter Hurley 	if (!port)
6849ed19428SPeter Hurley 		return;
6859ed19428SPeter Hurley 
686ab4382d2SGreg Kroah-Hartman 	if (port->ops->send_xchar)
687ab4382d2SGreg Kroah-Hartman 		port->ops->send_xchar(port, ch);
688ab4382d2SGreg Kroah-Hartman 	else {
689ab4382d2SGreg Kroah-Hartman 		spin_lock_irqsave(&port->lock, flags);
690c235ccc1SPeter Hurley 		port->x_char = ch;
691c235ccc1SPeter Hurley 		if (ch)
692ab4382d2SGreg Kroah-Hartman 			port->ops->start_tx(port);
693ab4382d2SGreg Kroah-Hartman 		spin_unlock_irqrestore(&port->lock, flags);
694ab4382d2SGreg Kroah-Hartman 	}
6959ed19428SPeter Hurley 	uart_port_deref(port);
696ab4382d2SGreg Kroah-Hartman }
697ab4382d2SGreg Kroah-Hartman 
698ab4382d2SGreg Kroah-Hartman static void uart_throttle(struct tty_struct *tty)
699ab4382d2SGreg Kroah-Hartman {
700ab4382d2SGreg Kroah-Hartman 	struct uart_state *state = tty->driver_data;
701c5f78b1fSJeremy Kerr 	upstat_t mask = UPSTAT_SYNC_FIFO;
7029ed19428SPeter Hurley 	struct uart_port *port;
703ab4382d2SGreg Kroah-Hartman 
7049ed19428SPeter Hurley 	port = uart_port_ref(state);
7059ed19428SPeter Hurley 	if (!port)
7069ed19428SPeter Hurley 		return;
7079ed19428SPeter Hurley 
708ab4382d2SGreg Kroah-Hartman 	if (I_IXOFF(tty))
709391f93f2SPeter Hurley 		mask |= UPSTAT_AUTOXOFF;
7109db276f8SPeter Hurley 	if (C_CRTSCTS(tty))
711391f93f2SPeter Hurley 		mask |= UPSTAT_AUTORTS;
7129aba8d5bSRussell King 
713391f93f2SPeter Hurley 	if (port->status & mask) {
7149aba8d5bSRussell King 		port->ops->throttle(port);
715391f93f2SPeter Hurley 		mask &= ~port->status;
7169aba8d5bSRussell King 	}
7179aba8d5bSRussell King 
718391f93f2SPeter Hurley 	if (mask & UPSTAT_AUTORTS)
7199aba8d5bSRussell King 		uart_clear_mctrl(port, TIOCM_RTS);
720b4749b97SPeter Hurley 
721b4749b97SPeter Hurley 	if (mask & UPSTAT_AUTOXOFF)
722b4749b97SPeter Hurley 		uart_send_xchar(tty, STOP_CHAR(tty));
7239ed19428SPeter Hurley 
7249ed19428SPeter Hurley 	uart_port_deref(port);
725ab4382d2SGreg Kroah-Hartman }
726ab4382d2SGreg Kroah-Hartman 
727ab4382d2SGreg Kroah-Hartman static void uart_unthrottle(struct tty_struct *tty)
728ab4382d2SGreg Kroah-Hartman {
729ab4382d2SGreg Kroah-Hartman 	struct uart_state *state = tty->driver_data;
730c5f78b1fSJeremy Kerr 	upstat_t mask = UPSTAT_SYNC_FIFO;
7319ed19428SPeter Hurley 	struct uart_port *port;
732ab4382d2SGreg Kroah-Hartman 
733fedb5760SGreg Kroah-Hartman 	if (!state)
734fedb5760SGreg Kroah-Hartman 		return;
735fedb5760SGreg Kroah-Hartman 
7369ed19428SPeter Hurley 	port = uart_port_ref(state);
7379ed19428SPeter Hurley 	if (!port)
7389ed19428SPeter Hurley 		return;
7399ed19428SPeter Hurley 
7409aba8d5bSRussell King 	if (I_IXOFF(tty))
741391f93f2SPeter Hurley 		mask |= UPSTAT_AUTOXOFF;
7429db276f8SPeter Hurley 	if (C_CRTSCTS(tty))
743391f93f2SPeter Hurley 		mask |= UPSTAT_AUTORTS;
7449aba8d5bSRussell King 
745391f93f2SPeter Hurley 	if (port->status & mask) {
7469aba8d5bSRussell King 		port->ops->unthrottle(port);
747391f93f2SPeter Hurley 		mask &= ~port->status;
7489aba8d5bSRussell King 	}
7499aba8d5bSRussell King 
750391f93f2SPeter Hurley 	if (mask & UPSTAT_AUTORTS)
751ab4382d2SGreg Kroah-Hartman 		uart_set_mctrl(port, TIOCM_RTS);
752b4749b97SPeter Hurley 
753b4749b97SPeter Hurley 	if (mask & UPSTAT_AUTOXOFF)
754b4749b97SPeter Hurley 		uart_send_xchar(tty, START_CHAR(tty));
7559ed19428SPeter Hurley 
7569ed19428SPeter Hurley 	uart_port_deref(port);
757ab4382d2SGreg Kroah-Hartman }
758ab4382d2SGreg Kroah-Hartman 
7594047b371SPeter Hurley static int uart_get_info(struct tty_port *port, struct serial_struct *retinfo)
760ab4382d2SGreg Kroah-Hartman {
7619f109694SAlan Cox 	struct uart_state *state = container_of(port, struct uart_state, port);
7624047b371SPeter Hurley 	struct uart_port *uport;
7634047b371SPeter Hurley 	int ret = -ENODEV;
7647ba2e769SAlan Cox 
76537cd0c99SFengguang Wu 	memset(retinfo, 0, sizeof(*retinfo));
7667ba2e769SAlan Cox 
7673abe8c76SPeter Hurley 	/*
7683abe8c76SPeter Hurley 	 * Ensure the state we copy is consistent and no hardware changes
7693abe8c76SPeter Hurley 	 * occur as we go
7703abe8c76SPeter Hurley 	 */
7713abe8c76SPeter Hurley 	mutex_lock(&port->mutex);
7724047b371SPeter Hurley 	uport = uart_port_check(state);
7734047b371SPeter Hurley 	if (!uport)
7744047b371SPeter Hurley 		goto out;
7754047b371SPeter Hurley 
7767ba2e769SAlan Cox 	retinfo->type	    = uport->type;
7777ba2e769SAlan Cox 	retinfo->line	    = uport->line;
7787ba2e769SAlan Cox 	retinfo->port	    = uport->iobase;
7797ba2e769SAlan Cox 	if (HIGH_BITS_OFFSET)
7807ba2e769SAlan Cox 		retinfo->port_high = (long) uport->iobase >> HIGH_BITS_OFFSET;
7817ba2e769SAlan Cox 	retinfo->irq		    = uport->irq;
782a17e74c5SAndy Shevchenko 	retinfo->flags	    = (__force int)uport->flags;
7837ba2e769SAlan Cox 	retinfo->xmit_fifo_size  = uport->fifosize;
7847ba2e769SAlan Cox 	retinfo->baud_base	    = uport->uartclk / 16;
7857ba2e769SAlan Cox 	retinfo->close_delay	    = jiffies_to_msecs(port->close_delay) / 10;
7867ba2e769SAlan Cox 	retinfo->closing_wait    = port->closing_wait == ASYNC_CLOSING_WAIT_NONE ?
7877ba2e769SAlan Cox 				ASYNC_CLOSING_WAIT_NONE :
7887ba2e769SAlan Cox 				jiffies_to_msecs(port->closing_wait) / 10;
7897ba2e769SAlan Cox 	retinfo->custom_divisor  = uport->custom_divisor;
7907ba2e769SAlan Cox 	retinfo->hub6	    = uport->hub6;
7917ba2e769SAlan Cox 	retinfo->io_type         = uport->iotype;
7927ba2e769SAlan Cox 	retinfo->iomem_reg_shift = uport->regshift;
7937ba2e769SAlan Cox 	retinfo->iomem_base      = (void *)(unsigned long)uport->mapbase;
7944047b371SPeter Hurley 
7954047b371SPeter Hurley 	ret = 0;
7964047b371SPeter Hurley out:
797ab4382d2SGreg Kroah-Hartman 	mutex_unlock(&port->mutex);
7984047b371SPeter Hurley 	return ret;
7999f109694SAlan Cox }
8009f109694SAlan Cox 
8015099d234SAl Viro static int uart_get_info_user(struct tty_struct *tty,
8025099d234SAl Viro 			 struct serial_struct *ss)
8039f109694SAlan Cox {
8045099d234SAl Viro 	struct uart_state *state = tty->driver_data;
8055099d234SAl Viro 	struct tty_port *port = &state->port;
8063abe8c76SPeter Hurley 
8075099d234SAl Viro 	return uart_get_info(port, ss) < 0 ? -EIO : 0;
808ab4382d2SGreg Kroah-Hartman }
809ab4382d2SGreg Kroah-Hartman 
8107ba2e769SAlan Cox static int uart_set_info(struct tty_struct *tty, struct tty_port *port,
8117ba2e769SAlan Cox 			 struct uart_state *state,
8127ba2e769SAlan Cox 			 struct serial_struct *new_info)
813ab4382d2SGreg Kroah-Hartman {
8144047b371SPeter Hurley 	struct uart_port *uport = uart_port_check(state);
815ab4382d2SGreg Kroah-Hartman 	unsigned long new_port;
816ab4382d2SGreg Kroah-Hartman 	unsigned int change_irq, change_port, closing_wait;
817ab4382d2SGreg Kroah-Hartman 	unsigned int old_custom_divisor, close_delay;
818ab4382d2SGreg Kroah-Hartman 	upf_t old_flags, new_flags;
819ab4382d2SGreg Kroah-Hartman 	int retval = 0;
820ab4382d2SGreg Kroah-Hartman 
8214047b371SPeter Hurley 	if (!uport)
8224047b371SPeter Hurley 		return -EIO;
8234047b371SPeter Hurley 
8247ba2e769SAlan Cox 	new_port = new_info->port;
825ab4382d2SGreg Kroah-Hartman 	if (HIGH_BITS_OFFSET)
8267ba2e769SAlan Cox 		new_port += (unsigned long) new_info->port_high << HIGH_BITS_OFFSET;
827ab4382d2SGreg Kroah-Hartman 
8287ba2e769SAlan Cox 	new_info->irq = irq_canonicalize(new_info->irq);
8297ba2e769SAlan Cox 	close_delay = msecs_to_jiffies(new_info->close_delay * 10);
8307ba2e769SAlan Cox 	closing_wait = new_info->closing_wait == ASYNC_CLOSING_WAIT_NONE ?
8314cb0fbfdSJiri Slaby 			ASYNC_CLOSING_WAIT_NONE :
8327ba2e769SAlan Cox 			msecs_to_jiffies(new_info->closing_wait * 10);
833ab4382d2SGreg Kroah-Hartman 
834ab4382d2SGreg Kroah-Hartman 
835ab4382d2SGreg Kroah-Hartman 	change_irq  = !(uport->flags & UPF_FIXED_PORT)
8367ba2e769SAlan Cox 		&& new_info->irq != uport->irq;
837ab4382d2SGreg Kroah-Hartman 
838ab4382d2SGreg Kroah-Hartman 	/*
839ab4382d2SGreg Kroah-Hartman 	 * Since changing the 'type' of the port changes its resource
840ab4382d2SGreg Kroah-Hartman 	 * allocations, we should treat type changes the same as
841ab4382d2SGreg Kroah-Hartman 	 * IO port changes.
842ab4382d2SGreg Kroah-Hartman 	 */
843ab4382d2SGreg Kroah-Hartman 	change_port = !(uport->flags & UPF_FIXED_PORT)
844ab4382d2SGreg Kroah-Hartman 		&& (new_port != uport->iobase ||
8457ba2e769SAlan Cox 		    (unsigned long)new_info->iomem_base != uport->mapbase ||
8467ba2e769SAlan Cox 		    new_info->hub6 != uport->hub6 ||
8477ba2e769SAlan Cox 		    new_info->io_type != uport->iotype ||
8487ba2e769SAlan Cox 		    new_info->iomem_reg_shift != uport->regshift ||
8497ba2e769SAlan Cox 		    new_info->type != uport->type);
850ab4382d2SGreg Kroah-Hartman 
851ab4382d2SGreg Kroah-Hartman 	old_flags = uport->flags;
852a17e74c5SAndy Shevchenko 	new_flags = (__force upf_t)new_info->flags;
853ab4382d2SGreg Kroah-Hartman 	old_custom_divisor = uport->custom_divisor;
854ab4382d2SGreg Kroah-Hartman 
855ab4382d2SGreg Kroah-Hartman 	if (!capable(CAP_SYS_ADMIN)) {
856ab4382d2SGreg Kroah-Hartman 		retval = -EPERM;
857ab4382d2SGreg Kroah-Hartman 		if (change_irq || change_port ||
8587ba2e769SAlan Cox 		    (new_info->baud_base != uport->uartclk / 16) ||
859ab4382d2SGreg Kroah-Hartman 		    (close_delay != port->close_delay) ||
860ab4382d2SGreg Kroah-Hartman 		    (closing_wait != port->closing_wait) ||
8617ba2e769SAlan Cox 		    (new_info->xmit_fifo_size &&
8627ba2e769SAlan Cox 		     new_info->xmit_fifo_size != uport->fifosize) ||
863ab4382d2SGreg Kroah-Hartman 		    (((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0))
864ab4382d2SGreg Kroah-Hartman 			goto exit;
865ab4382d2SGreg Kroah-Hartman 		uport->flags = ((uport->flags & ~UPF_USR_MASK) |
866ab4382d2SGreg Kroah-Hartman 			       (new_flags & UPF_USR_MASK));
8677ba2e769SAlan Cox 		uport->custom_divisor = new_info->custom_divisor;
868ab4382d2SGreg Kroah-Hartman 		goto check_and_exit;
869ab4382d2SGreg Kroah-Hartman 	}
870ab4382d2SGreg Kroah-Hartman 
871ab4382d2SGreg Kroah-Hartman 	/*
872ab4382d2SGreg Kroah-Hartman 	 * Ask the low level driver to verify the settings.
873ab4382d2SGreg Kroah-Hartman 	 */
874ab4382d2SGreg Kroah-Hartman 	if (uport->ops->verify_port)
8757ba2e769SAlan Cox 		retval = uport->ops->verify_port(uport, new_info);
876ab4382d2SGreg Kroah-Hartman 
8777ba2e769SAlan Cox 	if ((new_info->irq >= nr_irqs) || (new_info->irq < 0) ||
8787ba2e769SAlan Cox 	    (new_info->baud_base < 9600))
879ab4382d2SGreg Kroah-Hartman 		retval = -EINVAL;
880ab4382d2SGreg Kroah-Hartman 
881ab4382d2SGreg Kroah-Hartman 	if (retval)
882ab4382d2SGreg Kroah-Hartman 		goto exit;
883ab4382d2SGreg Kroah-Hartman 
884ab4382d2SGreg Kroah-Hartman 	if (change_port || change_irq) {
885ab4382d2SGreg Kroah-Hartman 		retval = -EBUSY;
886ab4382d2SGreg Kroah-Hartman 
887ab4382d2SGreg Kroah-Hartman 		/*
888ab4382d2SGreg Kroah-Hartman 		 * Make sure that we are the sole user of this port.
889ab4382d2SGreg Kroah-Hartman 		 */
890ab4382d2SGreg Kroah-Hartman 		if (tty_port_users(port) > 1)
891ab4382d2SGreg Kroah-Hartman 			goto exit;
892ab4382d2SGreg Kroah-Hartman 
893ab4382d2SGreg Kroah-Hartman 		/*
894ab4382d2SGreg Kroah-Hartman 		 * We need to shutdown the serial port at the old
895ab4382d2SGreg Kroah-Hartman 		 * port/type/irq combination.
896ab4382d2SGreg Kroah-Hartman 		 */
897ab4382d2SGreg Kroah-Hartman 		uart_shutdown(tty, state);
898ab4382d2SGreg Kroah-Hartman 	}
899ab4382d2SGreg Kroah-Hartman 
900ab4382d2SGreg Kroah-Hartman 	if (change_port) {
901ab4382d2SGreg Kroah-Hartman 		unsigned long old_iobase, old_mapbase;
902ab4382d2SGreg Kroah-Hartman 		unsigned int old_type, old_iotype, old_hub6, old_shift;
903ab4382d2SGreg Kroah-Hartman 
904ab4382d2SGreg Kroah-Hartman 		old_iobase = uport->iobase;
905ab4382d2SGreg Kroah-Hartman 		old_mapbase = uport->mapbase;
906ab4382d2SGreg Kroah-Hartman 		old_type = uport->type;
907ab4382d2SGreg Kroah-Hartman 		old_hub6 = uport->hub6;
908ab4382d2SGreg Kroah-Hartman 		old_iotype = uport->iotype;
909ab4382d2SGreg Kroah-Hartman 		old_shift = uport->regshift;
910ab4382d2SGreg Kroah-Hartman 
911ab4382d2SGreg Kroah-Hartman 		/*
912ab4382d2SGreg Kroah-Hartman 		 * Free and release old regions
913ab4382d2SGreg Kroah-Hartman 		 */
914a7cfaf16SFabio Estevam 		if (old_type != PORT_UNKNOWN && uport->ops->release_port)
915ab4382d2SGreg Kroah-Hartman 			uport->ops->release_port(uport);
916ab4382d2SGreg Kroah-Hartman 
917ab4382d2SGreg Kroah-Hartman 		uport->iobase = new_port;
9187ba2e769SAlan Cox 		uport->type = new_info->type;
9197ba2e769SAlan Cox 		uport->hub6 = new_info->hub6;
9207ba2e769SAlan Cox 		uport->iotype = new_info->io_type;
9217ba2e769SAlan Cox 		uport->regshift = new_info->iomem_reg_shift;
9227ba2e769SAlan Cox 		uport->mapbase = (unsigned long)new_info->iomem_base;
923ab4382d2SGreg Kroah-Hartman 
924ab4382d2SGreg Kroah-Hartman 		/*
925ab4382d2SGreg Kroah-Hartman 		 * Claim and map the new regions
926ab4382d2SGreg Kroah-Hartman 		 */
927a7cfaf16SFabio Estevam 		if (uport->type != PORT_UNKNOWN && uport->ops->request_port) {
928ab4382d2SGreg Kroah-Hartman 			retval = uport->ops->request_port(uport);
929ab4382d2SGreg Kroah-Hartman 		} else {
930ab4382d2SGreg Kroah-Hartman 			/* Always success - Jean II */
931ab4382d2SGreg Kroah-Hartman 			retval = 0;
932ab4382d2SGreg Kroah-Hartman 		}
933ab4382d2SGreg Kroah-Hartman 
934ab4382d2SGreg Kroah-Hartman 		/*
935ab4382d2SGreg Kroah-Hartman 		 * If we fail to request resources for the
936ab4382d2SGreg Kroah-Hartman 		 * new port, try to restore the old settings.
937ab4382d2SGreg Kroah-Hartman 		 */
9387deb39edSThomas Pfaff 		if (retval) {
939ab4382d2SGreg Kroah-Hartman 			uport->iobase = old_iobase;
940ab4382d2SGreg Kroah-Hartman 			uport->type = old_type;
941ab4382d2SGreg Kroah-Hartman 			uport->hub6 = old_hub6;
942ab4382d2SGreg Kroah-Hartman 			uport->iotype = old_iotype;
943ab4382d2SGreg Kroah-Hartman 			uport->regshift = old_shift;
944ab4382d2SGreg Kroah-Hartman 			uport->mapbase = old_mapbase;
9457deb39edSThomas Pfaff 
9467deb39edSThomas Pfaff 			if (old_type != PORT_UNKNOWN) {
947ab4382d2SGreg Kroah-Hartman 				retval = uport->ops->request_port(uport);
948ab4382d2SGreg Kroah-Hartman 				/*
949ab4382d2SGreg Kroah-Hartman 				 * If we failed to restore the old settings,
950ab4382d2SGreg Kroah-Hartman 				 * we fail like this.
951ab4382d2SGreg Kroah-Hartman 				 */
952ab4382d2SGreg Kroah-Hartman 				if (retval)
953ab4382d2SGreg Kroah-Hartman 					uport->type = PORT_UNKNOWN;
954ab4382d2SGreg Kroah-Hartman 
955ab4382d2SGreg Kroah-Hartman 				/*
956ab4382d2SGreg Kroah-Hartman 				 * We failed anyway.
957ab4382d2SGreg Kroah-Hartman 				 */
958ab4382d2SGreg Kroah-Hartman 				retval = -EBUSY;
9597deb39edSThomas Pfaff 			}
9607deb39edSThomas Pfaff 
961ab4382d2SGreg Kroah-Hartman 			/* Added to return the correct error -Ram Gupta */
962ab4382d2SGreg Kroah-Hartman 			goto exit;
963ab4382d2SGreg Kroah-Hartman 		}
964ab4382d2SGreg Kroah-Hartman 	}
965ab4382d2SGreg Kroah-Hartman 
966ab4382d2SGreg Kroah-Hartman 	if (change_irq)
9677ba2e769SAlan Cox 		uport->irq      = new_info->irq;
968ab4382d2SGreg Kroah-Hartman 	if (!(uport->flags & UPF_FIXED_PORT))
9697ba2e769SAlan Cox 		uport->uartclk  = new_info->baud_base * 16;
970ab4382d2SGreg Kroah-Hartman 	uport->flags            = (uport->flags & ~UPF_CHANGE_MASK) |
971ab4382d2SGreg Kroah-Hartman 				 (new_flags & UPF_CHANGE_MASK);
9727ba2e769SAlan Cox 	uport->custom_divisor   = new_info->custom_divisor;
973ab4382d2SGreg Kroah-Hartman 	port->close_delay     = close_delay;
974ab4382d2SGreg Kroah-Hartman 	port->closing_wait    = closing_wait;
9757ba2e769SAlan Cox 	if (new_info->xmit_fifo_size)
9767ba2e769SAlan Cox 		uport->fifosize = new_info->xmit_fifo_size;
977d6c53c0eSJiri Slaby 	port->low_latency = (uport->flags & UPF_LOW_LATENCY) ? 1 : 0;
978ab4382d2SGreg Kroah-Hartman 
979ab4382d2SGreg Kroah-Hartman  check_and_exit:
980ab4382d2SGreg Kroah-Hartman 	retval = 0;
981ab4382d2SGreg Kroah-Hartman 	if (uport->type == PORT_UNKNOWN)
982ab4382d2SGreg Kroah-Hartman 		goto exit;
983d41861caSPeter Hurley 	if (tty_port_initialized(port)) {
984ab4382d2SGreg Kroah-Hartman 		if (((old_flags ^ uport->flags) & UPF_SPD_MASK) ||
985ab4382d2SGreg Kroah-Hartman 		    old_custom_divisor != uport->custom_divisor) {
986ab4382d2SGreg Kroah-Hartman 			/*
987ab4382d2SGreg Kroah-Hartman 			 * If they're setting up a custom divisor or speed,
988dc2f7271SJohan Hovold 			 * instead of clearing it, then bitch about it.
989ab4382d2SGreg Kroah-Hartman 			 */
990ab4382d2SGreg Kroah-Hartman 			if (uport->flags & UPF_SPD_MASK) {
991dc2f7271SJohan Hovold 				dev_notice_ratelimited(uport->dev,
9922f2dafe7SSudip Mukherjee 				       "%s sets custom speed on %s. This is deprecated.\n",
9932f2dafe7SSudip Mukherjee 				      current->comm,
994429b4749SRasmus Villemoes 				      tty_name(port->tty));
995ab4382d2SGreg Kroah-Hartman 			}
996ab4382d2SGreg Kroah-Hartman 			uart_change_speed(tty, state, NULL);
997ab4382d2SGreg Kroah-Hartman 		}
998b3b57646SRob Herring 	} else {
999ab4382d2SGreg Kroah-Hartman 		retval = uart_startup(tty, state, 1);
100044117a1dSSebastian Andrzej Siewior 		if (retval == 0)
100144117a1dSSebastian Andrzej Siewior 			tty_port_set_initialized(port, true);
1002b3b57646SRob Herring 		if (retval > 0)
1003b3b57646SRob Herring 			retval = 0;
1004b3b57646SRob Herring 	}
1005ab4382d2SGreg Kroah-Hartman  exit:
10067ba2e769SAlan Cox 	return retval;
10077ba2e769SAlan Cox }
10087ba2e769SAlan Cox 
10095099d234SAl Viro static int uart_set_info_user(struct tty_struct *tty, struct serial_struct *ss)
10107ba2e769SAlan Cox {
10115099d234SAl Viro 	struct uart_state *state = tty->driver_data;
10127ba2e769SAlan Cox 	struct tty_port *port = &state->port;
10137ba2e769SAlan Cox 	int retval;
10147ba2e769SAlan Cox 
10155099d234SAl Viro 	down_write(&tty->termios_rwsem);
10167ba2e769SAlan Cox 	/*
10177ba2e769SAlan Cox 	 * This semaphore protects port->count.  It is also
10187ba2e769SAlan Cox 	 * very useful to prevent opens.  Also, take the
10197ba2e769SAlan Cox 	 * port configuration semaphore to make sure that a
10207ba2e769SAlan Cox 	 * module insertion/removal doesn't change anything
10217ba2e769SAlan Cox 	 * under us.
10227ba2e769SAlan Cox 	 */
10237ba2e769SAlan Cox 	mutex_lock(&port->mutex);
10245099d234SAl Viro 	retval = uart_set_info(tty, port, state, ss);
1025ab4382d2SGreg Kroah-Hartman 	mutex_unlock(&port->mutex);
10265099d234SAl Viro 	up_write(&tty->termios_rwsem);
1027ab4382d2SGreg Kroah-Hartman 	return retval;
1028ab4382d2SGreg Kroah-Hartman }
1029ab4382d2SGreg Kroah-Hartman 
1030ab4382d2SGreg Kroah-Hartman /**
1031ab4382d2SGreg Kroah-Hartman  *	uart_get_lsr_info	-	get line status register info
1032ab4382d2SGreg Kroah-Hartman  *	@tty: tty associated with the UART
1033ab4382d2SGreg Kroah-Hartman  *	@state: UART being queried
1034ab4382d2SGreg Kroah-Hartman  *	@value: returned modem value
1035ab4382d2SGreg Kroah-Hartman  */
1036ab4382d2SGreg Kroah-Hartman static int uart_get_lsr_info(struct tty_struct *tty,
1037ab4382d2SGreg Kroah-Hartman 			struct uart_state *state, unsigned int __user *value)
1038ab4382d2SGreg Kroah-Hartman {
10394047b371SPeter Hurley 	struct uart_port *uport = uart_port_check(state);
1040ab4382d2SGreg Kroah-Hartman 	unsigned int result;
1041ab4382d2SGreg Kroah-Hartman 
1042ab4382d2SGreg Kroah-Hartman 	result = uport->ops->tx_empty(uport);
1043ab4382d2SGreg Kroah-Hartman 
1044ab4382d2SGreg Kroah-Hartman 	/*
1045ab4382d2SGreg Kroah-Hartman 	 * If we're about to load something into the transmit
1046ab4382d2SGreg Kroah-Hartman 	 * register, we'll pretend the transmitter isn't empty to
1047ab4382d2SGreg Kroah-Hartman 	 * avoid a race condition (depending on when the transmit
1048ab4382d2SGreg Kroah-Hartman 	 * interrupt happens).
1049ab4382d2SGreg Kroah-Hartman 	 */
1050ab4382d2SGreg Kroah-Hartman 	if (uport->x_char ||
1051ab4382d2SGreg Kroah-Hartman 	    ((uart_circ_chars_pending(&state->xmit) > 0) &&
1052d01f4d18SPeter Hurley 	     !uart_tx_stopped(uport)))
1053ab4382d2SGreg Kroah-Hartman 		result &= ~TIOCSER_TEMT;
1054ab4382d2SGreg Kroah-Hartman 
1055ab4382d2SGreg Kroah-Hartman 	return put_user(result, value);
1056ab4382d2SGreg Kroah-Hartman }
1057ab4382d2SGreg Kroah-Hartman 
105860b33c13SAlan Cox static int uart_tiocmget(struct tty_struct *tty)
1059ab4382d2SGreg Kroah-Hartman {
1060ab4382d2SGreg Kroah-Hartman 	struct uart_state *state = tty->driver_data;
1061ab4382d2SGreg Kroah-Hartman 	struct tty_port *port = &state->port;
10624047b371SPeter Hurley 	struct uart_port *uport;
1063ab4382d2SGreg Kroah-Hartman 	int result = -EIO;
1064ab4382d2SGreg Kroah-Hartman 
1065ab4382d2SGreg Kroah-Hartman 	mutex_lock(&port->mutex);
10664047b371SPeter Hurley 	uport = uart_port_check(state);
10674047b371SPeter Hurley 	if (!uport)
10684047b371SPeter Hurley 		goto out;
10694047b371SPeter Hurley 
107018900ca6SPeter Hurley 	if (!tty_io_error(tty)) {
1071ab4382d2SGreg Kroah-Hartman 		result = uport->mctrl;
1072ab4382d2SGreg Kroah-Hartman 		spin_lock_irq(&uport->lock);
1073ab4382d2SGreg Kroah-Hartman 		result |= uport->ops->get_mctrl(uport);
1074ab4382d2SGreg Kroah-Hartman 		spin_unlock_irq(&uport->lock);
1075ab4382d2SGreg Kroah-Hartman 	}
10764047b371SPeter Hurley out:
1077ab4382d2SGreg Kroah-Hartman 	mutex_unlock(&port->mutex);
1078ab4382d2SGreg Kroah-Hartman 	return result;
1079ab4382d2SGreg Kroah-Hartman }
1080ab4382d2SGreg Kroah-Hartman 
1081ab4382d2SGreg Kroah-Hartman static int
108220b9d177SAlan Cox uart_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear)
1083ab4382d2SGreg Kroah-Hartman {
1084ab4382d2SGreg Kroah-Hartman 	struct uart_state *state = tty->driver_data;
1085ab4382d2SGreg Kroah-Hartman 	struct tty_port *port = &state->port;
10864047b371SPeter Hurley 	struct uart_port *uport;
1087ab4382d2SGreg Kroah-Hartman 	int ret = -EIO;
1088ab4382d2SGreg Kroah-Hartman 
1089ab4382d2SGreg Kroah-Hartman 	mutex_lock(&port->mutex);
10904047b371SPeter Hurley 	uport = uart_port_check(state);
10914047b371SPeter Hurley 	if (!uport)
10924047b371SPeter Hurley 		goto out;
10934047b371SPeter Hurley 
109418900ca6SPeter Hurley 	if (!tty_io_error(tty)) {
1095ab4382d2SGreg Kroah-Hartman 		uart_update_mctrl(uport, set, clear);
1096ab4382d2SGreg Kroah-Hartman 		ret = 0;
1097ab4382d2SGreg Kroah-Hartman 	}
10984047b371SPeter Hurley out:
1099ab4382d2SGreg Kroah-Hartman 	mutex_unlock(&port->mutex);
1100ab4382d2SGreg Kroah-Hartman 	return ret;
1101ab4382d2SGreg Kroah-Hartman }
1102ab4382d2SGreg Kroah-Hartman 
1103ab4382d2SGreg Kroah-Hartman static int uart_break_ctl(struct tty_struct *tty, int break_state)
1104ab4382d2SGreg Kroah-Hartman {
1105ab4382d2SGreg Kroah-Hartman 	struct uart_state *state = tty->driver_data;
1106ab4382d2SGreg Kroah-Hartman 	struct tty_port *port = &state->port;
11074047b371SPeter Hurley 	struct uart_port *uport;
11084047b371SPeter Hurley 	int ret = -EIO;
1109ab4382d2SGreg Kroah-Hartman 
1110ab4382d2SGreg Kroah-Hartman 	mutex_lock(&port->mutex);
11114047b371SPeter Hurley 	uport = uart_port_check(state);
11124047b371SPeter Hurley 	if (!uport)
11134047b371SPeter Hurley 		goto out;
1114ab4382d2SGreg Kroah-Hartman 
1115ab4382d2SGreg Kroah-Hartman 	if (uport->type != PORT_UNKNOWN)
1116ab4382d2SGreg Kroah-Hartman 		uport->ops->break_ctl(uport, break_state);
11174047b371SPeter Hurley 	ret = 0;
11184047b371SPeter Hurley out:
1119ab4382d2SGreg Kroah-Hartman 	mutex_unlock(&port->mutex);
11204047b371SPeter Hurley 	return ret;
1121ab4382d2SGreg Kroah-Hartman }
1122ab4382d2SGreg Kroah-Hartman 
1123ab4382d2SGreg Kroah-Hartman static int uart_do_autoconfig(struct tty_struct *tty,struct uart_state *state)
1124ab4382d2SGreg Kroah-Hartman {
1125ab4382d2SGreg Kroah-Hartman 	struct tty_port *port = &state->port;
11264047b371SPeter Hurley 	struct uart_port *uport;
1127ab4382d2SGreg Kroah-Hartman 	int flags, ret;
1128ab4382d2SGreg Kroah-Hartman 
1129ab4382d2SGreg Kroah-Hartman 	if (!capable(CAP_SYS_ADMIN))
1130ab4382d2SGreg Kroah-Hartman 		return -EPERM;
1131ab4382d2SGreg Kroah-Hartman 
1132ab4382d2SGreg Kroah-Hartman 	/*
1133ab4382d2SGreg Kroah-Hartman 	 * Take the per-port semaphore.  This prevents count from
1134ab4382d2SGreg Kroah-Hartman 	 * changing, and hence any extra opens of the port while
1135ab4382d2SGreg Kroah-Hartman 	 * we're auto-configuring.
1136ab4382d2SGreg Kroah-Hartman 	 */
1137ab4382d2SGreg Kroah-Hartman 	if (mutex_lock_interruptible(&port->mutex))
1138ab4382d2SGreg Kroah-Hartman 		return -ERESTARTSYS;
1139ab4382d2SGreg Kroah-Hartman 
11404047b371SPeter Hurley 	uport = uart_port_check(state);
11414047b371SPeter Hurley 	if (!uport) {
11424047b371SPeter Hurley 		ret = -EIO;
11434047b371SPeter Hurley 		goto out;
11444047b371SPeter Hurley 	}
11454047b371SPeter Hurley 
1146ab4382d2SGreg Kroah-Hartman 	ret = -EBUSY;
1147ab4382d2SGreg Kroah-Hartman 	if (tty_port_users(port) == 1) {
1148ab4382d2SGreg Kroah-Hartman 		uart_shutdown(tty, state);
1149ab4382d2SGreg Kroah-Hartman 
1150ab4382d2SGreg Kroah-Hartman 		/*
1151ab4382d2SGreg Kroah-Hartman 		 * If we already have a port type configured,
1152ab4382d2SGreg Kroah-Hartman 		 * we must release its resources.
1153ab4382d2SGreg Kroah-Hartman 		 */
1154a7cfaf16SFabio Estevam 		if (uport->type != PORT_UNKNOWN && uport->ops->release_port)
1155ab4382d2SGreg Kroah-Hartman 			uport->ops->release_port(uport);
1156ab4382d2SGreg Kroah-Hartman 
1157ab4382d2SGreg Kroah-Hartman 		flags = UART_CONFIG_TYPE;
1158ab4382d2SGreg Kroah-Hartman 		if (uport->flags & UPF_AUTO_IRQ)
1159ab4382d2SGreg Kroah-Hartman 			flags |= UART_CONFIG_IRQ;
1160ab4382d2SGreg Kroah-Hartman 
1161ab4382d2SGreg Kroah-Hartman 		/*
1162ab4382d2SGreg Kroah-Hartman 		 * This will claim the ports resources if
1163ab4382d2SGreg Kroah-Hartman 		 * a port is found.
1164ab4382d2SGreg Kroah-Hartman 		 */
1165ab4382d2SGreg Kroah-Hartman 		uport->ops->config_port(uport, flags);
1166ab4382d2SGreg Kroah-Hartman 
1167ab4382d2SGreg Kroah-Hartman 		ret = uart_startup(tty, state, 1);
116871456906SSebastian Andrzej Siewior 		if (ret == 0)
116971456906SSebastian Andrzej Siewior 			tty_port_set_initialized(port, true);
1170b3b57646SRob Herring 		if (ret > 0)
1171b3b57646SRob Herring 			ret = 0;
1172ab4382d2SGreg Kroah-Hartman 	}
11734047b371SPeter Hurley out:
1174ab4382d2SGreg Kroah-Hartman 	mutex_unlock(&port->mutex);
1175ab4382d2SGreg Kroah-Hartman 	return ret;
1176ab4382d2SGreg Kroah-Hartman }
1177ab4382d2SGreg Kroah-Hartman 
11781fdc3106SAlexander Shiyan static void uart_enable_ms(struct uart_port *uport)
11791fdc3106SAlexander Shiyan {
11801fdc3106SAlexander Shiyan 	/*
11811fdc3106SAlexander Shiyan 	 * Force modem status interrupts on
11821fdc3106SAlexander Shiyan 	 */
11831fdc3106SAlexander Shiyan 	if (uport->ops->enable_ms)
11841fdc3106SAlexander Shiyan 		uport->ops->enable_ms(uport);
11851fdc3106SAlexander Shiyan }
11861fdc3106SAlexander Shiyan 
1187ab4382d2SGreg Kroah-Hartman /*
1188ab4382d2SGreg Kroah-Hartman  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1189ab4382d2SGreg Kroah-Hartman  * - mask passed in arg for lines of interest
1190ab4382d2SGreg Kroah-Hartman  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1191ab4382d2SGreg Kroah-Hartman  * Caller should use TIOCGICOUNT to see which one it was
1192ab4382d2SGreg Kroah-Hartman  *
1193ab4382d2SGreg Kroah-Hartman  * FIXME: This wants extracting into a common all driver implementation
1194ab4382d2SGreg Kroah-Hartman  * of TIOCMWAIT using tty_port.
1195ab4382d2SGreg Kroah-Hartman  */
11969ed19428SPeter Hurley static int uart_wait_modem_status(struct uart_state *state, unsigned long arg)
1197ab4382d2SGreg Kroah-Hartman {
11989ed19428SPeter Hurley 	struct uart_port *uport;
1199ab4382d2SGreg Kroah-Hartman 	struct tty_port *port = &state->port;
1200ab4382d2SGreg Kroah-Hartman 	DECLARE_WAITQUEUE(wait, current);
1201ab4382d2SGreg Kroah-Hartman 	struct uart_icount cprev, cnow;
1202ab4382d2SGreg Kroah-Hartman 	int ret;
1203ab4382d2SGreg Kroah-Hartman 
1204ab4382d2SGreg Kroah-Hartman 	/*
1205ab4382d2SGreg Kroah-Hartman 	 * note the counters on entry
1206ab4382d2SGreg Kroah-Hartman 	 */
12079ed19428SPeter Hurley 	uport = uart_port_ref(state);
12089ed19428SPeter Hurley 	if (!uport)
12099ed19428SPeter Hurley 		return -EIO;
1210ab4382d2SGreg Kroah-Hartman 	spin_lock_irq(&uport->lock);
1211ab4382d2SGreg Kroah-Hartman 	memcpy(&cprev, &uport->icount, sizeof(struct uart_icount));
12121fdc3106SAlexander Shiyan 	uart_enable_ms(uport);
1213ab4382d2SGreg Kroah-Hartman 	spin_unlock_irq(&uport->lock);
1214ab4382d2SGreg Kroah-Hartman 
1215ab4382d2SGreg Kroah-Hartman 	add_wait_queue(&port->delta_msr_wait, &wait);
1216ab4382d2SGreg Kroah-Hartman 	for (;;) {
1217ab4382d2SGreg Kroah-Hartman 		spin_lock_irq(&uport->lock);
1218ab4382d2SGreg Kroah-Hartman 		memcpy(&cnow, &uport->icount, sizeof(struct uart_icount));
1219ab4382d2SGreg Kroah-Hartman 		spin_unlock_irq(&uport->lock);
1220ab4382d2SGreg Kroah-Hartman 
1221ab4382d2SGreg Kroah-Hartman 		set_current_state(TASK_INTERRUPTIBLE);
1222ab4382d2SGreg Kroah-Hartman 
1223ab4382d2SGreg Kroah-Hartman 		if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1224ab4382d2SGreg Kroah-Hartman 		    ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1225ab4382d2SGreg Kroah-Hartman 		    ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
1226ab4382d2SGreg Kroah-Hartman 		    ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
1227ab4382d2SGreg Kroah-Hartman 			ret = 0;
1228ab4382d2SGreg Kroah-Hartman 			break;
1229ab4382d2SGreg Kroah-Hartman 		}
1230ab4382d2SGreg Kroah-Hartman 
1231ab4382d2SGreg Kroah-Hartman 		schedule();
1232ab4382d2SGreg Kroah-Hartman 
1233ab4382d2SGreg Kroah-Hartman 		/* see if a signal did it */
1234ab4382d2SGreg Kroah-Hartman 		if (signal_pending(current)) {
1235ab4382d2SGreg Kroah-Hartman 			ret = -ERESTARTSYS;
1236ab4382d2SGreg Kroah-Hartman 			break;
1237ab4382d2SGreg Kroah-Hartman 		}
1238ab4382d2SGreg Kroah-Hartman 
1239ab4382d2SGreg Kroah-Hartman 		cprev = cnow;
1240ab4382d2SGreg Kroah-Hartman 	}
124197f9f707SFabian Frederick 	__set_current_state(TASK_RUNNING);
1242ab4382d2SGreg Kroah-Hartman 	remove_wait_queue(&port->delta_msr_wait, &wait);
12439ed19428SPeter Hurley 	uart_port_deref(uport);
1244ab4382d2SGreg Kroah-Hartman 
1245ab4382d2SGreg Kroah-Hartman 	return ret;
1246ab4382d2SGreg Kroah-Hartman }
1247ab4382d2SGreg Kroah-Hartman 
1248ab4382d2SGreg Kroah-Hartman /*
1249ab4382d2SGreg Kroah-Hartman  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1250ab4382d2SGreg Kroah-Hartman  * Return: write counters to the user passed counter struct
1251ab4382d2SGreg Kroah-Hartman  * NB: both 1->0 and 0->1 transitions are counted except for
1252ab4382d2SGreg Kroah-Hartman  *     RI where only 0->1 is counted.
1253ab4382d2SGreg Kroah-Hartman  */
1254ab4382d2SGreg Kroah-Hartman static int uart_get_icount(struct tty_struct *tty,
1255ab4382d2SGreg Kroah-Hartman 			  struct serial_icounter_struct *icount)
1256ab4382d2SGreg Kroah-Hartman {
1257ab4382d2SGreg Kroah-Hartman 	struct uart_state *state = tty->driver_data;
1258ab4382d2SGreg Kroah-Hartman 	struct uart_icount cnow;
12599ed19428SPeter Hurley 	struct uart_port *uport;
1260ab4382d2SGreg Kroah-Hartman 
12619ed19428SPeter Hurley 	uport = uart_port_ref(state);
12629ed19428SPeter Hurley 	if (!uport)
12639ed19428SPeter Hurley 		return -EIO;
1264ab4382d2SGreg Kroah-Hartman 	spin_lock_irq(&uport->lock);
1265ab4382d2SGreg Kroah-Hartman 	memcpy(&cnow, &uport->icount, sizeof(struct uart_icount));
1266ab4382d2SGreg Kroah-Hartman 	spin_unlock_irq(&uport->lock);
12679ed19428SPeter Hurley 	uart_port_deref(uport);
1268ab4382d2SGreg Kroah-Hartman 
1269ab4382d2SGreg Kroah-Hartman 	icount->cts         = cnow.cts;
1270ab4382d2SGreg Kroah-Hartman 	icount->dsr         = cnow.dsr;
1271ab4382d2SGreg Kroah-Hartman 	icount->rng         = cnow.rng;
1272ab4382d2SGreg Kroah-Hartman 	icount->dcd         = cnow.dcd;
1273ab4382d2SGreg Kroah-Hartman 	icount->rx          = cnow.rx;
1274ab4382d2SGreg Kroah-Hartman 	icount->tx          = cnow.tx;
1275ab4382d2SGreg Kroah-Hartman 	icount->frame       = cnow.frame;
1276ab4382d2SGreg Kroah-Hartman 	icount->overrun     = cnow.overrun;
1277ab4382d2SGreg Kroah-Hartman 	icount->parity      = cnow.parity;
1278ab4382d2SGreg Kroah-Hartman 	icount->brk         = cnow.brk;
1279ab4382d2SGreg Kroah-Hartman 	icount->buf_overrun = cnow.buf_overrun;
1280ab4382d2SGreg Kroah-Hartman 
1281ab4382d2SGreg Kroah-Hartman 	return 0;
1282ab4382d2SGreg Kroah-Hartman }
1283ab4382d2SGreg Kroah-Hartman 
1284a5f276f1SRicardo Ribalda Delgado static int uart_get_rs485_config(struct uart_port *port,
1285a5f276f1SRicardo Ribalda Delgado 			 struct serial_rs485 __user *rs485)
1286a5f276f1SRicardo Ribalda Delgado {
1287bd737f87SRicardo Ribalda Delgado 	unsigned long flags;
1288bd737f87SRicardo Ribalda Delgado 	struct serial_rs485 aux;
1289bd737f87SRicardo Ribalda Delgado 
1290bd737f87SRicardo Ribalda Delgado 	spin_lock_irqsave(&port->lock, flags);
1291bd737f87SRicardo Ribalda Delgado 	aux = port->rs485;
1292bd737f87SRicardo Ribalda Delgado 	spin_unlock_irqrestore(&port->lock, flags);
1293bd737f87SRicardo Ribalda Delgado 
1294bd737f87SRicardo Ribalda Delgado 	if (copy_to_user(rs485, &aux, sizeof(aux)))
1295a5f276f1SRicardo Ribalda Delgado 		return -EFAULT;
1296bd737f87SRicardo Ribalda Delgado 
1297a5f276f1SRicardo Ribalda Delgado 	return 0;
1298a5f276f1SRicardo Ribalda Delgado }
1299a5f276f1SRicardo Ribalda Delgado 
1300a5f276f1SRicardo Ribalda Delgado static int uart_set_rs485_config(struct uart_port *port,
1301a5f276f1SRicardo Ribalda Delgado 			 struct serial_rs485 __user *rs485_user)
1302a5f276f1SRicardo Ribalda Delgado {
1303a5f276f1SRicardo Ribalda Delgado 	struct serial_rs485 rs485;
1304a5f276f1SRicardo Ribalda Delgado 	int ret;
1305bd737f87SRicardo Ribalda Delgado 	unsigned long flags;
1306a5f276f1SRicardo Ribalda Delgado 
1307a5f276f1SRicardo Ribalda Delgado 	if (!port->rs485_config)
1308a5f276f1SRicardo Ribalda Delgado 		return -ENOIOCTLCMD;
1309a5f276f1SRicardo Ribalda Delgado 
1310a5f276f1SRicardo Ribalda Delgado 	if (copy_from_user(&rs485, rs485_user, sizeof(*rs485_user)))
1311a5f276f1SRicardo Ribalda Delgado 		return -EFAULT;
1312a5f276f1SRicardo Ribalda Delgado 
1313bd737f87SRicardo Ribalda Delgado 	spin_lock_irqsave(&port->lock, flags);
1314a5f276f1SRicardo Ribalda Delgado 	ret = port->rs485_config(port, &rs485);
1315bd737f87SRicardo Ribalda Delgado 	spin_unlock_irqrestore(&port->lock, flags);
1316a5f276f1SRicardo Ribalda Delgado 	if (ret)
1317a5f276f1SRicardo Ribalda Delgado 		return ret;
1318a5f276f1SRicardo Ribalda Delgado 
1319a5f276f1SRicardo Ribalda Delgado 	if (copy_to_user(rs485_user, &port->rs485, sizeof(port->rs485)))
1320a5f276f1SRicardo Ribalda Delgado 		return -EFAULT;
1321a5f276f1SRicardo Ribalda Delgado 
1322a5f276f1SRicardo Ribalda Delgado 	return 0;
1323a5f276f1SRicardo Ribalda Delgado }
1324a5f276f1SRicardo Ribalda Delgado 
1325ad8c0eaaSNicolas Ferre static int uart_get_iso7816_config(struct uart_port *port,
1326ad8c0eaaSNicolas Ferre 				   struct serial_iso7816 __user *iso7816)
1327ad8c0eaaSNicolas Ferre {
1328ad8c0eaaSNicolas Ferre 	unsigned long flags;
1329ad8c0eaaSNicolas Ferre 	struct serial_iso7816 aux;
1330ad8c0eaaSNicolas Ferre 
1331ad8c0eaaSNicolas Ferre 	if (!port->iso7816_config)
1332ad8c0eaaSNicolas Ferre 		return -ENOIOCTLCMD;
1333ad8c0eaaSNicolas Ferre 
1334ad8c0eaaSNicolas Ferre 	spin_lock_irqsave(&port->lock, flags);
1335ad8c0eaaSNicolas Ferre 	aux = port->iso7816;
1336ad8c0eaaSNicolas Ferre 	spin_unlock_irqrestore(&port->lock, flags);
1337ad8c0eaaSNicolas Ferre 
1338ad8c0eaaSNicolas Ferre 	if (copy_to_user(iso7816, &aux, sizeof(aux)))
1339ad8c0eaaSNicolas Ferre 		return -EFAULT;
1340ad8c0eaaSNicolas Ferre 
1341ad8c0eaaSNicolas Ferre 	return 0;
1342ad8c0eaaSNicolas Ferre }
1343ad8c0eaaSNicolas Ferre 
1344ad8c0eaaSNicolas Ferre static int uart_set_iso7816_config(struct uart_port *port,
1345ad8c0eaaSNicolas Ferre 				   struct serial_iso7816 __user *iso7816_user)
1346ad8c0eaaSNicolas Ferre {
1347ad8c0eaaSNicolas Ferre 	struct serial_iso7816 iso7816;
1348ad8c0eaaSNicolas Ferre 	int i, ret;
1349ad8c0eaaSNicolas Ferre 	unsigned long flags;
1350ad8c0eaaSNicolas Ferre 
1351ad8c0eaaSNicolas Ferre 	if (!port->iso7816_config)
1352ad8c0eaaSNicolas Ferre 		return -ENOIOCTLCMD;
1353ad8c0eaaSNicolas Ferre 
1354ad8c0eaaSNicolas Ferre 	if (copy_from_user(&iso7816, iso7816_user, sizeof(*iso7816_user)))
1355ad8c0eaaSNicolas Ferre 		return -EFAULT;
1356ad8c0eaaSNicolas Ferre 
1357ad8c0eaaSNicolas Ferre 	/*
1358ad8c0eaaSNicolas Ferre 	 * There are 5 words reserved for future use. Check that userspace
1359ad8c0eaaSNicolas Ferre 	 * doesn't put stuff in there to prevent breakages in the future.
1360ad8c0eaaSNicolas Ferre 	 */
1361ad8c0eaaSNicolas Ferre 	for (i = 0; i < 5; i++)
1362ad8c0eaaSNicolas Ferre 		if (iso7816.reserved[i])
1363ad8c0eaaSNicolas Ferre 			return -EINVAL;
1364ad8c0eaaSNicolas Ferre 
1365ad8c0eaaSNicolas Ferre 	spin_lock_irqsave(&port->lock, flags);
1366ad8c0eaaSNicolas Ferre 	ret = port->iso7816_config(port, &iso7816);
1367ad8c0eaaSNicolas Ferre 	spin_unlock_irqrestore(&port->lock, flags);
1368ad8c0eaaSNicolas Ferre 	if (ret)
1369ad8c0eaaSNicolas Ferre 		return ret;
1370ad8c0eaaSNicolas Ferre 
1371ad8c0eaaSNicolas Ferre 	if (copy_to_user(iso7816_user, &port->iso7816, sizeof(port->iso7816)))
1372ad8c0eaaSNicolas Ferre 		return -EFAULT;
1373ad8c0eaaSNicolas Ferre 
1374ad8c0eaaSNicolas Ferre 	return 0;
1375ad8c0eaaSNicolas Ferre }
1376ad8c0eaaSNicolas Ferre 
1377ab4382d2SGreg Kroah-Hartman /*
1378ab4382d2SGreg Kroah-Hartman  * Called via sys_ioctl.  We can use spin_lock_irq() here.
1379ab4382d2SGreg Kroah-Hartman  */
1380ab4382d2SGreg Kroah-Hartman static int
13814047b371SPeter Hurley uart_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg)
1382ab4382d2SGreg Kroah-Hartman {
1383ab4382d2SGreg Kroah-Hartman 	struct uart_state *state = tty->driver_data;
1384ab4382d2SGreg Kroah-Hartman 	struct tty_port *port = &state->port;
13854047b371SPeter Hurley 	struct uart_port *uport;
1386ab4382d2SGreg Kroah-Hartman 	void __user *uarg = (void __user *)arg;
1387ab4382d2SGreg Kroah-Hartman 	int ret = -ENOIOCTLCMD;
1388ab4382d2SGreg Kroah-Hartman 
1389ab4382d2SGreg Kroah-Hartman 
1390ab4382d2SGreg Kroah-Hartman 	/*
1391ab4382d2SGreg Kroah-Hartman 	 * These ioctls don't rely on the hardware to be present.
1392ab4382d2SGreg Kroah-Hartman 	 */
1393ab4382d2SGreg Kroah-Hartman 	switch (cmd) {
1394ab4382d2SGreg Kroah-Hartman 	case TIOCSERCONFIG:
13957c8ab967SPeter Hurley 		down_write(&tty->termios_rwsem);
1396ab4382d2SGreg Kroah-Hartman 		ret = uart_do_autoconfig(tty, state);
13977c8ab967SPeter Hurley 		up_write(&tty->termios_rwsem);
1398ab4382d2SGreg Kroah-Hartman 		break;
1399ab4382d2SGreg Kroah-Hartman 	}
1400ab4382d2SGreg Kroah-Hartman 
1401ab4382d2SGreg Kroah-Hartman 	if (ret != -ENOIOCTLCMD)
1402ab4382d2SGreg Kroah-Hartman 		goto out;
1403ab4382d2SGreg Kroah-Hartman 
140418900ca6SPeter Hurley 	if (tty_io_error(tty)) {
1405ab4382d2SGreg Kroah-Hartman 		ret = -EIO;
1406ab4382d2SGreg Kroah-Hartman 		goto out;
1407ab4382d2SGreg Kroah-Hartman 	}
1408ab4382d2SGreg Kroah-Hartman 
1409ab4382d2SGreg Kroah-Hartman 	/*
1410ab4382d2SGreg Kroah-Hartman 	 * The following should only be used when hardware is present.
1411ab4382d2SGreg Kroah-Hartman 	 */
1412ab4382d2SGreg Kroah-Hartman 	switch (cmd) {
1413ab4382d2SGreg Kroah-Hartman 	case TIOCMIWAIT:
1414ab4382d2SGreg Kroah-Hartman 		ret = uart_wait_modem_status(state, arg);
1415ab4382d2SGreg Kroah-Hartman 		break;
1416ab4382d2SGreg Kroah-Hartman 	}
1417ab4382d2SGreg Kroah-Hartman 
1418ab4382d2SGreg Kroah-Hartman 	if (ret != -ENOIOCTLCMD)
1419ab4382d2SGreg Kroah-Hartman 		goto out;
1420ab4382d2SGreg Kroah-Hartman 
1421ab4382d2SGreg Kroah-Hartman 	mutex_lock(&port->mutex);
14224047b371SPeter Hurley 	uport = uart_port_check(state);
1423ab4382d2SGreg Kroah-Hartman 
14244047b371SPeter Hurley 	if (!uport || tty_io_error(tty)) {
1425ab4382d2SGreg Kroah-Hartman 		ret = -EIO;
1426ab4382d2SGreg Kroah-Hartman 		goto out_up;
1427ab4382d2SGreg Kroah-Hartman 	}
1428ab4382d2SGreg Kroah-Hartman 
1429ab4382d2SGreg Kroah-Hartman 	/*
1430ab4382d2SGreg Kroah-Hartman 	 * All these rely on hardware being present and need to be
1431ab4382d2SGreg Kroah-Hartman 	 * protected against the tty being hung up.
1432ab4382d2SGreg Kroah-Hartman 	 */
1433a9c20a9cSRicardo Ribalda Delgado 
1434ab4382d2SGreg Kroah-Hartman 	switch (cmd) {
1435a9c20a9cSRicardo Ribalda Delgado 	case TIOCSERGETLSR: /* Get line status register */
1436a9c20a9cSRicardo Ribalda Delgado 		ret = uart_get_lsr_info(tty, state, uarg);
1437a9c20a9cSRicardo Ribalda Delgado 		break;
1438a9c20a9cSRicardo Ribalda Delgado 
1439a5f276f1SRicardo Ribalda Delgado 	case TIOCGRS485:
14404047b371SPeter Hurley 		ret = uart_get_rs485_config(uport, uarg);
1441a5f276f1SRicardo Ribalda Delgado 		break;
1442a5f276f1SRicardo Ribalda Delgado 
1443a5f276f1SRicardo Ribalda Delgado 	case TIOCSRS485:
14444047b371SPeter Hurley 		ret = uart_set_rs485_config(uport, uarg);
1445a5f276f1SRicardo Ribalda Delgado 		break;
1446ad8c0eaaSNicolas Ferre 
1447ad8c0eaaSNicolas Ferre 	case TIOCSISO7816:
1448ad8c0eaaSNicolas Ferre 		ret = uart_set_iso7816_config(state->uart_port, uarg);
1449ad8c0eaaSNicolas Ferre 		break;
1450ad8c0eaaSNicolas Ferre 
1451ad8c0eaaSNicolas Ferre 	case TIOCGISO7816:
1452ad8c0eaaSNicolas Ferre 		ret = uart_get_iso7816_config(state->uart_port, uarg);
1453ad8c0eaaSNicolas Ferre 		break;
14544047b371SPeter Hurley 	default:
1455ab4382d2SGreg Kroah-Hartman 		if (uport->ops->ioctl)
1456ab4382d2SGreg Kroah-Hartman 			ret = uport->ops->ioctl(uport, cmd, arg);
1457ab4382d2SGreg Kroah-Hartman 		break;
1458ab4382d2SGreg Kroah-Hartman 	}
1459ab4382d2SGreg Kroah-Hartman out_up:
1460ab4382d2SGreg Kroah-Hartman 	mutex_unlock(&port->mutex);
1461ab4382d2SGreg Kroah-Hartman out:
1462ab4382d2SGreg Kroah-Hartman 	return ret;
1463ab4382d2SGreg Kroah-Hartman }
1464ab4382d2SGreg Kroah-Hartman 
1465ab4382d2SGreg Kroah-Hartman static void uart_set_ldisc(struct tty_struct *tty)
1466ab4382d2SGreg Kroah-Hartman {
1467ab4382d2SGreg Kroah-Hartman 	struct uart_state *state = tty->driver_data;
14684047b371SPeter Hurley 	struct uart_port *uport;
1469ab4382d2SGreg Kroah-Hartman 
1470db1b9dfcSPeter Hurley 	mutex_lock(&state->port.mutex);
14714047b371SPeter Hurley 	uport = uart_port_check(state);
14724047b371SPeter Hurley 	if (uport && uport->ops->set_ldisc)
1473732a84a0SPeter Hurley 		uport->ops->set_ldisc(uport, &tty->termios);
1474db1b9dfcSPeter Hurley 	mutex_unlock(&state->port.mutex);
1475db1b9dfcSPeter Hurley }
1476ab4382d2SGreg Kroah-Hartman 
1477ab4382d2SGreg Kroah-Hartman static void uart_set_termios(struct tty_struct *tty,
1478ab4382d2SGreg Kroah-Hartman 						struct ktermios *old_termios)
1479ab4382d2SGreg Kroah-Hartman {
1480ab4382d2SGreg Kroah-Hartman 	struct uart_state *state = tty->driver_data;
14814047b371SPeter Hurley 	struct uart_port *uport;
1482adc8d746SAlan Cox 	unsigned int cflag = tty->termios.c_cflag;
14832cbacafdSRussell King 	unsigned int iflag_mask = IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK;
14842cbacafdSRussell King 	bool sw_changed = false;
1485ab4382d2SGreg Kroah-Hartman 
14864047b371SPeter Hurley 	mutex_lock(&state->port.mutex);
14874047b371SPeter Hurley 	uport = uart_port_check(state);
14884047b371SPeter Hurley 	if (!uport)
14894047b371SPeter Hurley 		goto out;
14904047b371SPeter Hurley 
14912cbacafdSRussell King 	/*
14922cbacafdSRussell King 	 * Drivers doing software flow control also need to know
14932cbacafdSRussell King 	 * about changes to these input settings.
14942cbacafdSRussell King 	 */
14952cbacafdSRussell King 	if (uport->flags & UPF_SOFT_FLOW) {
14962cbacafdSRussell King 		iflag_mask |= IXANY|IXON|IXOFF;
14972cbacafdSRussell King 		sw_changed =
14982cbacafdSRussell King 		   tty->termios.c_cc[VSTART] != old_termios->c_cc[VSTART] ||
14992cbacafdSRussell King 		   tty->termios.c_cc[VSTOP] != old_termios->c_cc[VSTOP];
15002cbacafdSRussell King 	}
1501ab4382d2SGreg Kroah-Hartman 
1502ab4382d2SGreg Kroah-Hartman 	/*
1503ab4382d2SGreg Kroah-Hartman 	 * These are the bits that are used to setup various
1504ab4382d2SGreg Kroah-Hartman 	 * flags in the low level driver. We can ignore the Bfoo
1505ab4382d2SGreg Kroah-Hartman 	 * bits in c_cflag; c_[io]speed will always be set
1506ab4382d2SGreg Kroah-Hartman 	 * appropriately by set_termios() in tty_ioctl.c
1507ab4382d2SGreg Kroah-Hartman 	 */
1508ab4382d2SGreg Kroah-Hartman 	if ((cflag ^ old_termios->c_cflag) == 0 &&
1509adc8d746SAlan Cox 	    tty->termios.c_ospeed == old_termios->c_ospeed &&
1510adc8d746SAlan Cox 	    tty->termios.c_ispeed == old_termios->c_ispeed &&
15112cbacafdSRussell King 	    ((tty->termios.c_iflag ^ old_termios->c_iflag) & iflag_mask) == 0 &&
15122cbacafdSRussell King 	    !sw_changed) {
15134047b371SPeter Hurley 		goto out;
1514ab4382d2SGreg Kroah-Hartman 	}
1515ab4382d2SGreg Kroah-Hartman 
1516ab4382d2SGreg Kroah-Hartman 	uart_change_speed(tty, state, old_termios);
1517c18b55fdSPeter Hurley 	/* reload cflag from termios; port driver may have overriden flags */
1518c18b55fdSPeter Hurley 	cflag = tty->termios.c_cflag;
1519ab4382d2SGreg Kroah-Hartman 
1520ab4382d2SGreg Kroah-Hartman 	/* Handle transition to B0 status */
1521ab4382d2SGreg Kroah-Hartman 	if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD))
1522dec94e70SRussell King 		uart_clear_mctrl(uport, TIOCM_RTS | TIOCM_DTR);
1523ab4382d2SGreg Kroah-Hartman 	/* Handle transition away from B0 status */
1524ab4382d2SGreg Kroah-Hartman 	else if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) {
1525ab4382d2SGreg Kroah-Hartman 		unsigned int mask = TIOCM_DTR;
152697ef38b8SPeter Hurley 		if (!(cflag & CRTSCTS) || !tty_throttled(tty))
1527ab4382d2SGreg Kroah-Hartman 			mask |= TIOCM_RTS;
1528dec94e70SRussell King 		uart_set_mctrl(uport, mask);
1529ab4382d2SGreg Kroah-Hartman 	}
15304047b371SPeter Hurley out:
15314047b371SPeter Hurley 	mutex_unlock(&state->port.mutex);
1532ab4382d2SGreg Kroah-Hartman }
1533ab4382d2SGreg Kroah-Hartman 
1534ab4382d2SGreg Kroah-Hartman /*
1535ef4f527cSKevin Cernekee  * Calls to uart_close() are serialised via the tty_lock in
1536ef4f527cSKevin Cernekee  *   drivers/tty/tty_io.c:tty_release()
1537ef4f527cSKevin Cernekee  *   drivers/tty/tty_io.c:do_tty_hangup()
1538ab4382d2SGreg Kroah-Hartman  */
1539ab4382d2SGreg Kroah-Hartman static void uart_close(struct tty_struct *tty, struct file *filp)
1540ab4382d2SGreg Kroah-Hartman {
1541ab4382d2SGreg Kroah-Hartman 	struct uart_state *state = tty->driver_data;
1542ab4382d2SGreg Kroah-Hartman 
154391b32f54SPeter Hurley 	if (!state) {
154491b32f54SPeter Hurley 		struct uart_driver *drv = tty->driver->driver_state;
15459356335fSColin Ian King 		struct tty_port *port;
154691b32f54SPeter Hurley 
154791b32f54SPeter Hurley 		state = drv->state + tty->index;
154891b32f54SPeter Hurley 		port = &state->port;
154991b32f54SPeter Hurley 		spin_lock_irq(&port->lock);
155091b32f54SPeter Hurley 		--port->count;
155191b32f54SPeter Hurley 		spin_unlock_irq(&port->lock);
1552ab4382d2SGreg Kroah-Hartman 		return;
155391b32f54SPeter Hurley 	}
1554ab4382d2SGreg Kroah-Hartman 
155539b3d892SPeter Hurley 	pr_debug("uart_close(%d) called\n", tty->index);
1556ab4382d2SGreg Kroah-Hartman 
1557761ed4a9SRob Herring 	tty_port_close(tty->port, tty, filp);
1558761ed4a9SRob Herring }
1559ab4382d2SGreg Kroah-Hartman 
1560761ed4a9SRob Herring static void uart_tty_port_shutdown(struct tty_port *port)
1561761ed4a9SRob Herring {
1562761ed4a9SRob Herring 	struct uart_state *state = container_of(port, struct uart_state, port);
1563761ed4a9SRob Herring 	struct uart_port *uport = uart_port_check(state);
1564af224ca2SPeter Hurley 
1565ab4382d2SGreg Kroah-Hartman 	/*
1566ab4382d2SGreg Kroah-Hartman 	 * At this point, we stop accepting input.  To do this, we
1567ab4382d2SGreg Kroah-Hartman 	 * disable the receive line status interrupts.
1568ab4382d2SGreg Kroah-Hartman 	 */
1569a5a2b130SAndy Shevchenko 	if (WARN(!uport, "detached port still initialized!\n"))
1570a5a2b130SAndy Shevchenko 		return;
1571761ed4a9SRob Herring 
1572a5a2b130SAndy Shevchenko 	spin_lock_irq(&uport->lock);
1573ab4382d2SGreg Kroah-Hartman 	uport->ops->stop_rx(uport);
15746fb98fb3SPeter Hurley 	spin_unlock_irq(&uport->lock);
1575761ed4a9SRob Herring 
1576761ed4a9SRob Herring 	uart_port_shutdown(port);
1577761ed4a9SRob Herring 
1578ab4382d2SGreg Kroah-Hartman 	/*
1579761ed4a9SRob Herring 	 * It's possible for shutdown to be called after suspend if we get
1580761ed4a9SRob Herring 	 * a DCD drop (hangup) at just the right time.  Clear suspended bit so
1581761ed4a9SRob Herring 	 * we don't try to resume a port that has been shutdown.
1582ab4382d2SGreg Kroah-Hartman 	 */
1583761ed4a9SRob Herring 	tty_port_set_suspended(port, 0);
1584ab4382d2SGreg Kroah-Hartman 
15856f538fe3SLinus Walleij 	uart_change_pm(state, UART_PM_STATE_OFF);
1586ab4382d2SGreg Kroah-Hartman 
1587ab4382d2SGreg Kroah-Hartman }
1588ab4382d2SGreg Kroah-Hartman 
15891f33a51dSJiri Slaby static void uart_wait_until_sent(struct tty_struct *tty, int timeout)
1590ab4382d2SGreg Kroah-Hartman {
15911f33a51dSJiri Slaby 	struct uart_state *state = tty->driver_data;
15929ed19428SPeter Hurley 	struct uart_port *port;
1593ab4382d2SGreg Kroah-Hartman 	unsigned long char_time, expire;
1594ab4382d2SGreg Kroah-Hartman 
15959ed19428SPeter Hurley 	port = uart_port_ref(state);
1596ef510beaSAndy Shevchenko 	if (!port)
1597ef510beaSAndy Shevchenko 		return;
1598ef510beaSAndy Shevchenko 
1599ef510beaSAndy Shevchenko 	if (port->type == PORT_UNKNOWN || port->fifosize == 0) {
16009ed19428SPeter Hurley 		uart_port_deref(port);
1601ab4382d2SGreg Kroah-Hartman 		return;
16029ed19428SPeter Hurley 	}
1603ab4382d2SGreg Kroah-Hartman 
1604ab4382d2SGreg Kroah-Hartman 	/*
1605ab4382d2SGreg Kroah-Hartman 	 * Set the check interval to be 1/5 of the estimated time to
1606ab4382d2SGreg Kroah-Hartman 	 * send a single character, and make it at least 1.  The check
1607ab4382d2SGreg Kroah-Hartman 	 * interval should also be less than the timeout.
1608ab4382d2SGreg Kroah-Hartman 	 *
1609ab4382d2SGreg Kroah-Hartman 	 * Note: we have to use pretty tight timings here to satisfy
1610ab4382d2SGreg Kroah-Hartman 	 * the NIST-PCTS.
1611ab4382d2SGreg Kroah-Hartman 	 */
1612ab4382d2SGreg Kroah-Hartman 	char_time = (port->timeout - HZ/50) / port->fifosize;
1613ab4382d2SGreg Kroah-Hartman 	char_time = char_time / 5;
1614ab4382d2SGreg Kroah-Hartman 	if (char_time == 0)
1615ab4382d2SGreg Kroah-Hartman 		char_time = 1;
1616ab4382d2SGreg Kroah-Hartman 	if (timeout && timeout < char_time)
1617ab4382d2SGreg Kroah-Hartman 		char_time = timeout;
1618ab4382d2SGreg Kroah-Hartman 
1619ab4382d2SGreg Kroah-Hartman 	/*
1620ab4382d2SGreg Kroah-Hartman 	 * If the transmitter hasn't cleared in twice the approximate
1621ab4382d2SGreg Kroah-Hartman 	 * amount of time to send the entire FIFO, it probably won't
1622ab4382d2SGreg Kroah-Hartman 	 * ever clear.  This assumes the UART isn't doing flow
1623ab4382d2SGreg Kroah-Hartman 	 * control, which is currently the case.  Hence, if it ever
1624ab4382d2SGreg Kroah-Hartman 	 * takes longer than port->timeout, this is probably due to a
1625ab4382d2SGreg Kroah-Hartman 	 * UART bug of some kind.  So, we clamp the timeout parameter at
1626ab4382d2SGreg Kroah-Hartman 	 * 2*port->timeout.
1627ab4382d2SGreg Kroah-Hartman 	 */
1628ab4382d2SGreg Kroah-Hartman 	if (timeout == 0 || timeout > 2 * port->timeout)
1629ab4382d2SGreg Kroah-Hartman 		timeout = 2 * port->timeout;
1630ab4382d2SGreg Kroah-Hartman 
1631ab4382d2SGreg Kroah-Hartman 	expire = jiffies + timeout;
1632ab4382d2SGreg Kroah-Hartman 
1633ab4382d2SGreg Kroah-Hartman 	pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n",
1634ab4382d2SGreg Kroah-Hartman 		port->line, jiffies, expire);
1635ab4382d2SGreg Kroah-Hartman 
1636ab4382d2SGreg Kroah-Hartman 	/*
1637ab4382d2SGreg Kroah-Hartman 	 * Check whether the transmitter is empty every 'char_time'.
1638ab4382d2SGreg Kroah-Hartman 	 * 'timeout' / 'expire' give us the maximum amount of time
1639ab4382d2SGreg Kroah-Hartman 	 * we wait.
1640ab4382d2SGreg Kroah-Hartman 	 */
1641ab4382d2SGreg Kroah-Hartman 	while (!port->ops->tx_empty(port)) {
1642ab4382d2SGreg Kroah-Hartman 		msleep_interruptible(jiffies_to_msecs(char_time));
1643ab4382d2SGreg Kroah-Hartman 		if (signal_pending(current))
1644ab4382d2SGreg Kroah-Hartman 			break;
1645ab4382d2SGreg Kroah-Hartman 		if (time_after(jiffies, expire))
1646ab4382d2SGreg Kroah-Hartman 			break;
1647ab4382d2SGreg Kroah-Hartman 	}
16489ed19428SPeter Hurley 	uart_port_deref(port);
1649ab4382d2SGreg Kroah-Hartman }
1650ab4382d2SGreg Kroah-Hartman 
1651ab4382d2SGreg Kroah-Hartman /*
1652ef4f527cSKevin Cernekee  * Calls to uart_hangup() are serialised by the tty_lock in
1653ef4f527cSKevin Cernekee  *   drivers/tty/tty_io.c:do_tty_hangup()
1654ef4f527cSKevin Cernekee  * This runs from a workqueue and can sleep for a _short_ time only.
1655ab4382d2SGreg Kroah-Hartman  */
1656ab4382d2SGreg Kroah-Hartman static void uart_hangup(struct tty_struct *tty)
1657ab4382d2SGreg Kroah-Hartman {
1658ab4382d2SGreg Kroah-Hartman 	struct uart_state *state = tty->driver_data;
1659ab4382d2SGreg Kroah-Hartman 	struct tty_port *port = &state->port;
1660af224ca2SPeter Hurley 	struct uart_port *uport;
1661ab4382d2SGreg Kroah-Hartman 	unsigned long flags;
1662ab4382d2SGreg Kroah-Hartman 
166339b3d892SPeter Hurley 	pr_debug("uart_hangup(%d)\n", tty->index);
1664ab4382d2SGreg Kroah-Hartman 
1665ab4382d2SGreg Kroah-Hartman 	mutex_lock(&port->mutex);
1666af224ca2SPeter Hurley 	uport = uart_port_check(state);
1667af224ca2SPeter Hurley 	WARN(!uport, "hangup of detached port!\n");
1668af224ca2SPeter Hurley 
1669807c8d81SPeter Hurley 	if (tty_port_active(port)) {
1670ab4382d2SGreg Kroah-Hartman 		uart_flush_buffer(tty);
1671ab4382d2SGreg Kroah-Hartman 		uart_shutdown(tty, state);
1672ab4382d2SGreg Kroah-Hartman 		spin_lock_irqsave(&port->lock, flags);
1673ab4382d2SGreg Kroah-Hartman 		port->count = 0;
1674ab4382d2SGreg Kroah-Hartman 		spin_unlock_irqrestore(&port->lock, flags);
1675807c8d81SPeter Hurley 		tty_port_set_active(port, 0);
1676ab4382d2SGreg Kroah-Hartman 		tty_port_tty_set(port, NULL);
1677af224ca2SPeter Hurley 		if (uport && !uart_console(uport))
1678bf903c0cSGeert Uytterhoeven 			uart_change_pm(state, UART_PM_STATE_OFF);
1679ab4382d2SGreg Kroah-Hartman 		wake_up_interruptible(&port->open_wait);
1680ab4382d2SGreg Kroah-Hartman 		wake_up_interruptible(&port->delta_msr_wait);
1681ab4382d2SGreg Kroah-Hartman 	}
1682ab4382d2SGreg Kroah-Hartman 	mutex_unlock(&port->mutex);
1683ab4382d2SGreg Kroah-Hartman }
1684ab4382d2SGreg Kroah-Hartman 
1685af224ca2SPeter Hurley /* uport == NULL if uart_port has already been removed */
16860b1db830SJiri Slaby static void uart_port_shutdown(struct tty_port *port)
16870b1db830SJiri Slaby {
1688b922e19dSJiri Slaby 	struct uart_state *state = container_of(port, struct uart_state, port);
16894047b371SPeter Hurley 	struct uart_port *uport = uart_port_check(state);
1690b922e19dSJiri Slaby 
1691b922e19dSJiri Slaby 	/*
1692b922e19dSJiri Slaby 	 * clear delta_msr_wait queue to avoid mem leaks: we may free
1693b922e19dSJiri Slaby 	 * the irq here so the queue might never be woken up.  Note
1694b922e19dSJiri Slaby 	 * that we won't end up waiting on delta_msr_wait again since
1695b922e19dSJiri Slaby 	 * any outstanding file descriptors should be pointing at
1696b922e19dSJiri Slaby 	 * hung_up_tty_fops now.
1697b922e19dSJiri Slaby 	 */
1698b922e19dSJiri Slaby 	wake_up_interruptible(&port->delta_msr_wait);
1699b922e19dSJiri Slaby 
1700b922e19dSJiri Slaby 	/*
1701b922e19dSJiri Slaby 	 * Free the IRQ and disable the port.
1702b922e19dSJiri Slaby 	 */
1703af224ca2SPeter Hurley 	if (uport)
1704b922e19dSJiri Slaby 		uport->ops->shutdown(uport);
1705b922e19dSJiri Slaby 
1706b922e19dSJiri Slaby 	/*
1707b922e19dSJiri Slaby 	 * Ensure that the IRQ handler isn't running on another CPU.
1708b922e19dSJiri Slaby 	 */
1709af224ca2SPeter Hurley 	if (uport)
1710b922e19dSJiri Slaby 		synchronize_irq(uport->irq);
17110b1db830SJiri Slaby }
17120b1db830SJiri Slaby 
1713ab4382d2SGreg Kroah-Hartman static int uart_carrier_raised(struct tty_port *port)
1714ab4382d2SGreg Kroah-Hartman {
1715ab4382d2SGreg Kroah-Hartman 	struct uart_state *state = container_of(port, struct uart_state, port);
17169ed19428SPeter Hurley 	struct uart_port *uport;
1717ab4382d2SGreg Kroah-Hartman 	int mctrl;
17189ed19428SPeter Hurley 
17199ed19428SPeter Hurley 	uport = uart_port_ref(state);
17209ed19428SPeter Hurley 	/*
17219ed19428SPeter Hurley 	 * Should never observe uport == NULL since checks for hangup should
17229ed19428SPeter Hurley 	 * abort the tty_port_block_til_ready() loop before checking for carrier
17239ed19428SPeter Hurley 	 * raised -- but report carrier raised if it does anyway so open will
17249ed19428SPeter Hurley 	 * continue and not sleep
17259ed19428SPeter Hurley 	 */
17269ed19428SPeter Hurley 	if (WARN_ON(!uport))
17279ed19428SPeter Hurley 		return 1;
1728ab4382d2SGreg Kroah-Hartman 	spin_lock_irq(&uport->lock);
17291fdc3106SAlexander Shiyan 	uart_enable_ms(uport);
1730ab4382d2SGreg Kroah-Hartman 	mctrl = uport->ops->get_mctrl(uport);
1731ab4382d2SGreg Kroah-Hartman 	spin_unlock_irq(&uport->lock);
17329ed19428SPeter Hurley 	uart_port_deref(uport);
1733ab4382d2SGreg Kroah-Hartman 	if (mctrl & TIOCM_CAR)
1734ab4382d2SGreg Kroah-Hartman 		return 1;
1735ab4382d2SGreg Kroah-Hartman 	return 0;
1736ab4382d2SGreg Kroah-Hartman }
1737ab4382d2SGreg Kroah-Hartman 
1738a6845e1eSRafael Gago static void uart_dtr_rts(struct tty_port *port, int raise)
1739ab4382d2SGreg Kroah-Hartman {
1740ab4382d2SGreg Kroah-Hartman 	struct uart_state *state = container_of(port, struct uart_state, port);
17419ed19428SPeter Hurley 	struct uart_port *uport;
17429ed19428SPeter Hurley 
17439ed19428SPeter Hurley 	uport = uart_port_ref(state);
17449ed19428SPeter Hurley 	if (!uport)
17459ed19428SPeter Hurley 		return;
1746a6845e1eSRafael Gago 	uart_port_dtr_rts(uport, raise);
17479ed19428SPeter Hurley 	uart_port_deref(uport);
1748ab4382d2SGreg Kroah-Hartman }
1749ab4382d2SGreg Kroah-Hartman 
1750ab4382d2SGreg Kroah-Hartman /*
1751ef4f527cSKevin Cernekee  * Calls to uart_open are serialised by the tty_lock in
1752ef4f527cSKevin Cernekee  *   drivers/tty/tty_io.c:tty_open()
1753ab4382d2SGreg Kroah-Hartman  * Note that if this fails, then uart_close() _will_ be called.
1754ab4382d2SGreg Kroah-Hartman  *
1755ab4382d2SGreg Kroah-Hartman  * In time, we want to scrap the "opening nonpresent ports"
1756ab4382d2SGreg Kroah-Hartman  * behaviour and implement an alternative way for setserial
1757ab4382d2SGreg Kroah-Hartman  * to set base addresses/ports/types.  This will allow us to
1758ab4382d2SGreg Kroah-Hartman  * get rid of a certain amount of extra tests.
1759ab4382d2SGreg Kroah-Hartman  */
1760ab4382d2SGreg Kroah-Hartman static int uart_open(struct tty_struct *tty, struct file *filp)
1761ab4382d2SGreg Kroah-Hartman {
17625e388027SPeter Hurley 	struct uart_driver *drv = tty->driver->driver_state;
1763ab4382d2SGreg Kroah-Hartman 	int retval, line = tty->index;
17641c7b13c4SJiri Slaby 	struct uart_state *state = drv->state + line;
1765ab4382d2SGreg Kroah-Hartman 
1766ab4382d2SGreg Kroah-Hartman 	tty->driver_data = state;
1767b3b57646SRob Herring 
1768b3b57646SRob Herring 	retval = tty_port_open(&state->port, tty, filp);
1769b3b57646SRob Herring 	if (retval > 0)
1770b3b57646SRob Herring 		retval = 0;
1771b3b57646SRob Herring 
1772b3b57646SRob Herring 	return retval;
1773b3b57646SRob Herring }
1774b3b57646SRob Herring 
1775b3b57646SRob Herring static int uart_port_activate(struct tty_port *port, struct tty_struct *tty)
1776b3b57646SRob Herring {
1777b3b57646SRob Herring 	struct uart_state *state = container_of(port, struct uart_state, port);
1778b3b57646SRob Herring 	struct uart_port *uport;
1779b3b57646SRob Herring 
1780b3b57646SRob Herring 	uport = uart_port_check(state);
1781b3b57646SRob Herring 	if (!uport || uport->flags & UPF_DEAD)
1782b3b57646SRob Herring 		return -ENXIO;
1783b3b57646SRob Herring 
17844047b371SPeter Hurley 	port->low_latency = (uport->flags & UPF_LOW_LATENCY) ? 1 : 0;
1785ab4382d2SGreg Kroah-Hartman 
1786ab4382d2SGreg Kroah-Hartman 	/*
1787ab4382d2SGreg Kroah-Hartman 	 * Start up the serial port.
1788ab4382d2SGreg Kroah-Hartman 	 */
1789b3b57646SRob Herring 	return uart_startup(tty, state, 0);
1790ab4382d2SGreg Kroah-Hartman }
1791ab4382d2SGreg Kroah-Hartman 
1792ab4382d2SGreg Kroah-Hartman static const char *uart_type(struct uart_port *port)
1793ab4382d2SGreg Kroah-Hartman {
1794ab4382d2SGreg Kroah-Hartman 	const char *str = NULL;
1795ab4382d2SGreg Kroah-Hartman 
1796ab4382d2SGreg Kroah-Hartman 	if (port->ops->type)
1797ab4382d2SGreg Kroah-Hartman 		str = port->ops->type(port);
1798ab4382d2SGreg Kroah-Hartman 
1799ab4382d2SGreg Kroah-Hartman 	if (!str)
1800ab4382d2SGreg Kroah-Hartman 		str = "unknown";
1801ab4382d2SGreg Kroah-Hartman 
1802ab4382d2SGreg Kroah-Hartman 	return str;
1803ab4382d2SGreg Kroah-Hartman }
1804ab4382d2SGreg Kroah-Hartman 
1805ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS
1806ab4382d2SGreg Kroah-Hartman 
1807ab4382d2SGreg Kroah-Hartman static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i)
1808ab4382d2SGreg Kroah-Hartman {
1809ab4382d2SGreg Kroah-Hartman 	struct uart_state *state = drv->state + i;
1810ab4382d2SGreg Kroah-Hartman 	struct tty_port *port = &state->port;
18116f538fe3SLinus Walleij 	enum uart_pm_state pm_state;
18124047b371SPeter Hurley 	struct uart_port *uport;
1813ab4382d2SGreg Kroah-Hartman 	char stat_buf[32];
1814ab4382d2SGreg Kroah-Hartman 	unsigned int status;
1815ab4382d2SGreg Kroah-Hartman 	int mmio;
1816ab4382d2SGreg Kroah-Hartman 
18174047b371SPeter Hurley 	mutex_lock(&port->mutex);
18184047b371SPeter Hurley 	uport = uart_port_check(state);
1819ab4382d2SGreg Kroah-Hartman 	if (!uport)
18204047b371SPeter Hurley 		goto out;
1821ab4382d2SGreg Kroah-Hartman 
1822ab4382d2SGreg Kroah-Hartman 	mmio = uport->iotype >= UPIO_MEM;
1823ab4382d2SGreg Kroah-Hartman 	seq_printf(m, "%d: uart:%s %s%08llX irq:%d",
1824ab4382d2SGreg Kroah-Hartman 			uport->line, uart_type(uport),
1825ab4382d2SGreg Kroah-Hartman 			mmio ? "mmio:0x" : "port:",
1826ab4382d2SGreg Kroah-Hartman 			mmio ? (unsigned long long)uport->mapbase
1827ab4382d2SGreg Kroah-Hartman 			     : (unsigned long long)uport->iobase,
1828ab4382d2SGreg Kroah-Hartman 			uport->irq);
1829ab4382d2SGreg Kroah-Hartman 
1830ab4382d2SGreg Kroah-Hartman 	if (uport->type == PORT_UNKNOWN) {
1831ab4382d2SGreg Kroah-Hartman 		seq_putc(m, '\n');
18324047b371SPeter Hurley 		goto out;
1833ab4382d2SGreg Kroah-Hartman 	}
1834ab4382d2SGreg Kroah-Hartman 
1835ab4382d2SGreg Kroah-Hartman 	if (capable(CAP_SYS_ADMIN)) {
1836ab4382d2SGreg Kroah-Hartman 		pm_state = state->pm_state;
18376f538fe3SLinus Walleij 		if (pm_state != UART_PM_STATE_ON)
18386f538fe3SLinus Walleij 			uart_change_pm(state, UART_PM_STATE_ON);
1839ab4382d2SGreg Kroah-Hartman 		spin_lock_irq(&uport->lock);
1840ab4382d2SGreg Kroah-Hartman 		status = uport->ops->get_mctrl(uport);
1841ab4382d2SGreg Kroah-Hartman 		spin_unlock_irq(&uport->lock);
18426f538fe3SLinus Walleij 		if (pm_state != UART_PM_STATE_ON)
1843ab4382d2SGreg Kroah-Hartman 			uart_change_pm(state, pm_state);
1844ab4382d2SGreg Kroah-Hartman 
1845ab4382d2SGreg Kroah-Hartman 		seq_printf(m, " tx:%d rx:%d",
1846ab4382d2SGreg Kroah-Hartman 				uport->icount.tx, uport->icount.rx);
1847ab4382d2SGreg Kroah-Hartman 		if (uport->icount.frame)
1848968af298SPeter Hurley 			seq_printf(m, " fe:%d",	uport->icount.frame);
1849ab4382d2SGreg Kroah-Hartman 		if (uport->icount.parity)
1850968af298SPeter Hurley 			seq_printf(m, " pe:%d",	uport->icount.parity);
1851ab4382d2SGreg Kroah-Hartman 		if (uport->icount.brk)
1852968af298SPeter Hurley 			seq_printf(m, " brk:%d", uport->icount.brk);
1853ab4382d2SGreg Kroah-Hartman 		if (uport->icount.overrun)
1854968af298SPeter Hurley 			seq_printf(m, " oe:%d", uport->icount.overrun);
18554f794097SJeremy Kerr 		if (uport->icount.buf_overrun)
18564f794097SJeremy Kerr 			seq_printf(m, " bo:%d", uport->icount.buf_overrun);
1857ab4382d2SGreg Kroah-Hartman 
1858ab4382d2SGreg Kroah-Hartman #define INFOBIT(bit, str) \
1859ab4382d2SGreg Kroah-Hartman 	if (uport->mctrl & (bit)) \
1860ab4382d2SGreg Kroah-Hartman 		strncat(stat_buf, (str), sizeof(stat_buf) - \
1861ab4382d2SGreg Kroah-Hartman 			strlen(stat_buf) - 2)
1862ab4382d2SGreg Kroah-Hartman #define STATBIT(bit, str) \
1863ab4382d2SGreg Kroah-Hartman 	if (status & (bit)) \
1864ab4382d2SGreg Kroah-Hartman 		strncat(stat_buf, (str), sizeof(stat_buf) - \
1865ab4382d2SGreg Kroah-Hartman 		       strlen(stat_buf) - 2)
1866ab4382d2SGreg Kroah-Hartman 
1867ab4382d2SGreg Kroah-Hartman 		stat_buf[0] = '\0';
1868ab4382d2SGreg Kroah-Hartman 		stat_buf[1] = '\0';
1869ab4382d2SGreg Kroah-Hartman 		INFOBIT(TIOCM_RTS, "|RTS");
1870ab4382d2SGreg Kroah-Hartman 		STATBIT(TIOCM_CTS, "|CTS");
1871ab4382d2SGreg Kroah-Hartman 		INFOBIT(TIOCM_DTR, "|DTR");
1872ab4382d2SGreg Kroah-Hartman 		STATBIT(TIOCM_DSR, "|DSR");
1873ab4382d2SGreg Kroah-Hartman 		STATBIT(TIOCM_CAR, "|CD");
1874ab4382d2SGreg Kroah-Hartman 		STATBIT(TIOCM_RNG, "|RI");
1875ab4382d2SGreg Kroah-Hartman 		if (stat_buf[0])
1876ab4382d2SGreg Kroah-Hartman 			stat_buf[0] = ' ';
1877ab4382d2SGreg Kroah-Hartman 
1878ab4382d2SGreg Kroah-Hartman 		seq_puts(m, stat_buf);
1879ab4382d2SGreg Kroah-Hartman 	}
1880ab4382d2SGreg Kroah-Hartman 	seq_putc(m, '\n');
1881ab4382d2SGreg Kroah-Hartman #undef STATBIT
1882ab4382d2SGreg Kroah-Hartman #undef INFOBIT
18834047b371SPeter Hurley out:
18844047b371SPeter Hurley 	mutex_unlock(&port->mutex);
1885ab4382d2SGreg Kroah-Hartman }
1886ab4382d2SGreg Kroah-Hartman 
1887ab4382d2SGreg Kroah-Hartman static int uart_proc_show(struct seq_file *m, void *v)
1888ab4382d2SGreg Kroah-Hartman {
1889ab4382d2SGreg Kroah-Hartman 	struct tty_driver *ttydrv = m->private;
1890ab4382d2SGreg Kroah-Hartman 	struct uart_driver *drv = ttydrv->driver_state;
1891ab4382d2SGreg Kroah-Hartman 	int i;
1892ab4382d2SGreg Kroah-Hartman 
1893968af298SPeter Hurley 	seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", "", "", "");
1894ab4382d2SGreg Kroah-Hartman 	for (i = 0; i < drv->nr; i++)
1895ab4382d2SGreg Kroah-Hartman 		uart_line_info(m, drv, i);
1896ab4382d2SGreg Kroah-Hartman 	return 0;
1897ab4382d2SGreg Kroah-Hartman }
1898ab4382d2SGreg Kroah-Hartman #endif
1899ab4382d2SGreg Kroah-Hartman 
1900ab4382d2SGreg Kroah-Hartman #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL)
19011cfe42b7SPeter Hurley /**
1902ab4382d2SGreg Kroah-Hartman  *	uart_console_write - write a console message to a serial port
1903ab4382d2SGreg Kroah-Hartman  *	@port: the port to write the message
1904ab4382d2SGreg Kroah-Hartman  *	@s: array of characters
1905ab4382d2SGreg Kroah-Hartman  *	@count: number of characters in string to write
190610afbe34SPeter Hurley  *	@putchar: function to write character to port
1907ab4382d2SGreg Kroah-Hartman  */
1908ab4382d2SGreg Kroah-Hartman void uart_console_write(struct uart_port *port, const char *s,
1909ab4382d2SGreg Kroah-Hartman 			unsigned int count,
1910ab4382d2SGreg Kroah-Hartman 			void (*putchar)(struct uart_port *, int))
1911ab4382d2SGreg Kroah-Hartman {
1912ab4382d2SGreg Kroah-Hartman 	unsigned int i;
1913ab4382d2SGreg Kroah-Hartman 
1914ab4382d2SGreg Kroah-Hartman 	for (i = 0; i < count; i++, s++) {
1915ab4382d2SGreg Kroah-Hartman 		if (*s == '\n')
1916ab4382d2SGreg Kroah-Hartman 			putchar(port, '\r');
1917ab4382d2SGreg Kroah-Hartman 		putchar(port, *s);
1918ab4382d2SGreg Kroah-Hartman 	}
1919ab4382d2SGreg Kroah-Hartman }
1920ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_console_write);
1921ab4382d2SGreg Kroah-Hartman 
1922ab4382d2SGreg Kroah-Hartman /*
1923ab4382d2SGreg Kroah-Hartman  *	Check whether an invalid uart number has been specified, and
1924ab4382d2SGreg Kroah-Hartman  *	if so, search for the first available port that does have
1925ab4382d2SGreg Kroah-Hartman  *	console support.
1926ab4382d2SGreg Kroah-Hartman  */
1927ab4382d2SGreg Kroah-Hartman struct uart_port * __init
1928ab4382d2SGreg Kroah-Hartman uart_get_console(struct uart_port *ports, int nr, struct console *co)
1929ab4382d2SGreg Kroah-Hartman {
1930ab4382d2SGreg Kroah-Hartman 	int idx = co->index;
1931ab4382d2SGreg Kroah-Hartman 
1932ab4382d2SGreg Kroah-Hartman 	if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 &&
1933ab4382d2SGreg Kroah-Hartman 				     ports[idx].membase == NULL))
1934ab4382d2SGreg Kroah-Hartman 		for (idx = 0; idx < nr; idx++)
1935ab4382d2SGreg Kroah-Hartman 			if (ports[idx].iobase != 0 ||
1936ab4382d2SGreg Kroah-Hartman 			    ports[idx].membase != NULL)
1937ab4382d2SGreg Kroah-Hartman 				break;
1938ab4382d2SGreg Kroah-Hartman 
1939ab4382d2SGreg Kroah-Hartman 	co->index = idx;
1940ab4382d2SGreg Kroah-Hartman 
1941ab4382d2SGreg Kroah-Hartman 	return ports + idx;
1942ab4382d2SGreg Kroah-Hartman }
1943ab4382d2SGreg Kroah-Hartman 
1944ab4382d2SGreg Kroah-Hartman /**
194573abaf87SPeter Hurley  *	uart_parse_earlycon - Parse earlycon options
194673abaf87SPeter Hurley  *	@p:	  ptr to 2nd field (ie., just beyond '<name>,')
194773abaf87SPeter Hurley  *	@iotype:  ptr for decoded iotype (out)
194873abaf87SPeter Hurley  *	@addr:    ptr for decoded mapbase/iobase (out)
194973abaf87SPeter Hurley  *	@options: ptr for <options> field; NULL if not present (out)
195073abaf87SPeter Hurley  *
195173abaf87SPeter Hurley  *	Decodes earlycon kernel command line parameters of the form
1952bd94c407SMasahiro Yamada  *	   earlycon=<name>,io|mmio|mmio16|mmio32|mmio32be|mmio32native,<addr>,<options>
1953bd94c407SMasahiro Yamada  *	   console=<name>,io|mmio|mmio16|mmio32|mmio32be|mmio32native,<addr>,<options>
195473abaf87SPeter Hurley  *
195573abaf87SPeter Hurley  *	The optional form
195673abaf87SPeter Hurley  *	   earlycon=<name>,0x<addr>,<options>
195773abaf87SPeter Hurley  *	   console=<name>,0x<addr>,<options>
195873abaf87SPeter Hurley  *	is also accepted; the returned @iotype will be UPIO_MEM.
195973abaf87SPeter Hurley  *
19608b2303deSAlexander Sverdlin  *	Returns 0 on success or -EINVAL on failure
196173abaf87SPeter Hurley  */
196246e36683SAlexander Sverdlin int uart_parse_earlycon(char *p, unsigned char *iotype, resource_size_t *addr,
196373abaf87SPeter Hurley 			char **options)
196473abaf87SPeter Hurley {
196573abaf87SPeter Hurley 	if (strncmp(p, "mmio,", 5) == 0) {
196673abaf87SPeter Hurley 		*iotype = UPIO_MEM;
196773abaf87SPeter Hurley 		p += 5;
1968bd94c407SMasahiro Yamada 	} else if (strncmp(p, "mmio16,", 7) == 0) {
1969bd94c407SMasahiro Yamada 		*iotype = UPIO_MEM16;
1970bd94c407SMasahiro Yamada 		p += 7;
197173abaf87SPeter Hurley 	} else if (strncmp(p, "mmio32,", 7) == 0) {
197273abaf87SPeter Hurley 		*iotype = UPIO_MEM32;
197373abaf87SPeter Hurley 		p += 7;
19746e63be3fSNoam Camus 	} else if (strncmp(p, "mmio32be,", 9) == 0) {
19756e63be3fSNoam Camus 		*iotype = UPIO_MEM32BE;
19766e63be3fSNoam Camus 		p += 9;
1977d215d809SMax Filippov 	} else if (strncmp(p, "mmio32native,", 13) == 0) {
1978d215d809SMax Filippov 		*iotype = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) ?
1979d215d809SMax Filippov 			UPIO_MEM32BE : UPIO_MEM32;
1980d215d809SMax Filippov 		p += 13;
198173abaf87SPeter Hurley 	} else if (strncmp(p, "io,", 3) == 0) {
198273abaf87SPeter Hurley 		*iotype = UPIO_PORT;
198373abaf87SPeter Hurley 		p += 3;
198473abaf87SPeter Hurley 	} else if (strncmp(p, "0x", 2) == 0) {
198573abaf87SPeter Hurley 		*iotype = UPIO_MEM;
198673abaf87SPeter Hurley 	} else {
198773abaf87SPeter Hurley 		return -EINVAL;
198873abaf87SPeter Hurley 	}
198973abaf87SPeter Hurley 
19908b2303deSAlexander Sverdlin 	/*
19918b2303deSAlexander Sverdlin 	 * Before you replace it with kstrtoull(), think about options separator
19928b2303deSAlexander Sverdlin 	 * (',') it will not tolerate
19938b2303deSAlexander Sverdlin 	 */
19948b2303deSAlexander Sverdlin 	*addr = simple_strtoull(p, NULL, 0);
199573abaf87SPeter Hurley 	p = strchr(p, ',');
199673abaf87SPeter Hurley 	if (p)
199773abaf87SPeter Hurley 		p++;
199873abaf87SPeter Hurley 
199973abaf87SPeter Hurley 	*options = p;
200073abaf87SPeter Hurley 	return 0;
200173abaf87SPeter Hurley }
200273abaf87SPeter Hurley EXPORT_SYMBOL_GPL(uart_parse_earlycon);
200373abaf87SPeter Hurley 
200473abaf87SPeter Hurley /**
200502088ca6SGeert Uytterhoeven  *	uart_parse_options - Parse serial port baud/parity/bits/flow control.
2006ab4382d2SGreg Kroah-Hartman  *	@options: pointer to option string
2007ab4382d2SGreg Kroah-Hartman  *	@baud: pointer to an 'int' variable for the baud rate.
2008ab4382d2SGreg Kroah-Hartman  *	@parity: pointer to an 'int' variable for the parity.
2009ab4382d2SGreg Kroah-Hartman  *	@bits: pointer to an 'int' variable for the number of data bits.
2010ab4382d2SGreg Kroah-Hartman  *	@flow: pointer to an 'int' variable for the flow control character.
2011ab4382d2SGreg Kroah-Hartman  *
2012ab4382d2SGreg Kroah-Hartman  *	uart_parse_options decodes a string containing the serial console
2013ab4382d2SGreg Kroah-Hartman  *	options.  The format of the string is <baud><parity><bits><flow>,
2014ab4382d2SGreg Kroah-Hartman  *	eg: 115200n8r
2015ab4382d2SGreg Kroah-Hartman  */
2016ab4382d2SGreg Kroah-Hartman void
20170f646b63SPaul Cercueil uart_parse_options(const char *options, int *baud, int *parity,
20180f646b63SPaul Cercueil 		   int *bits, int *flow)
2019ab4382d2SGreg Kroah-Hartman {
20200f646b63SPaul Cercueil 	const char *s = options;
2021ab4382d2SGreg Kroah-Hartman 
2022ab4382d2SGreg Kroah-Hartman 	*baud = simple_strtoul(s, NULL, 10);
2023ab4382d2SGreg Kroah-Hartman 	while (*s >= '0' && *s <= '9')
2024ab4382d2SGreg Kroah-Hartman 		s++;
2025ab4382d2SGreg Kroah-Hartman 	if (*s)
2026ab4382d2SGreg Kroah-Hartman 		*parity = *s++;
2027ab4382d2SGreg Kroah-Hartman 	if (*s)
2028ab4382d2SGreg Kroah-Hartman 		*bits = *s++ - '0';
2029ab4382d2SGreg Kroah-Hartman 	if (*s)
2030ab4382d2SGreg Kroah-Hartman 		*flow = *s;
2031ab4382d2SGreg Kroah-Hartman }
2032ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_parse_options);
2033ab4382d2SGreg Kroah-Hartman 
2034ab4382d2SGreg Kroah-Hartman /**
2035ab4382d2SGreg Kroah-Hartman  *	uart_set_options - setup the serial console parameters
2036ab4382d2SGreg Kroah-Hartman  *	@port: pointer to the serial ports uart_port structure
2037ab4382d2SGreg Kroah-Hartman  *	@co: console pointer
2038ab4382d2SGreg Kroah-Hartman  *	@baud: baud rate
2039ab4382d2SGreg Kroah-Hartman  *	@parity: parity character - 'n' (none), 'o' (odd), 'e' (even)
2040ab4382d2SGreg Kroah-Hartman  *	@bits: number of data bits
2041ab4382d2SGreg Kroah-Hartman  *	@flow: flow control character - 'r' (rts)
2042ab4382d2SGreg Kroah-Hartman  */
2043ab4382d2SGreg Kroah-Hartman int
2044ab4382d2SGreg Kroah-Hartman uart_set_options(struct uart_port *port, struct console *co,
2045ab4382d2SGreg Kroah-Hartman 		 int baud, int parity, int bits, int flow)
2046ab4382d2SGreg Kroah-Hartman {
2047ab4382d2SGreg Kroah-Hartman 	struct ktermios termios;
2048ab4382d2SGreg Kroah-Hartman 	static struct ktermios dummy;
2049ab4382d2SGreg Kroah-Hartman 
2050ab4382d2SGreg Kroah-Hartman 	/*
2051ab4382d2SGreg Kroah-Hartman 	 * Ensure that the serial console lock is initialised
2052ab4382d2SGreg Kroah-Hartman 	 * early.
205342b6a1baSRandy Witt 	 * If this port is a console, then the spinlock is already
205442b6a1baSRandy Witt 	 * initialised.
2055ab4382d2SGreg Kroah-Hartman 	 */
205642b6a1baSRandy Witt 	if (!(uart_console(port) && (port->cons->flags & CON_ENABLED))) {
2057ab4382d2SGreg Kroah-Hartman 		spin_lock_init(&port->lock);
2058ab4382d2SGreg Kroah-Hartman 		lockdep_set_class(&port->lock, &port_lock_key);
205942b6a1baSRandy Witt 	}
2060ab4382d2SGreg Kroah-Hartman 
2061ab4382d2SGreg Kroah-Hartman 	memset(&termios, 0, sizeof(struct ktermios));
2062ab4382d2SGreg Kroah-Hartman 
2063ba47f97aSJeffy Chen 	termios.c_cflag |= CREAD | HUPCL | CLOCAL;
2064ba47f97aSJeffy Chen 	tty_termios_encode_baud_rate(&termios, baud, baud);
2065ab4382d2SGreg Kroah-Hartman 
2066ab4382d2SGreg Kroah-Hartman 	if (bits == 7)
2067ab4382d2SGreg Kroah-Hartman 		termios.c_cflag |= CS7;
2068ab4382d2SGreg Kroah-Hartman 	else
2069ab4382d2SGreg Kroah-Hartman 		termios.c_cflag |= CS8;
2070ab4382d2SGreg Kroah-Hartman 
2071ab4382d2SGreg Kroah-Hartman 	switch (parity) {
2072ab4382d2SGreg Kroah-Hartman 	case 'o': case 'O':
2073ab4382d2SGreg Kroah-Hartman 		termios.c_cflag |= PARODD;
2074ab4382d2SGreg Kroah-Hartman 		/*fall through*/
2075ab4382d2SGreg Kroah-Hartman 	case 'e': case 'E':
2076ab4382d2SGreg Kroah-Hartman 		termios.c_cflag |= PARENB;
2077ab4382d2SGreg Kroah-Hartman 		break;
2078ab4382d2SGreg Kroah-Hartman 	}
2079ab4382d2SGreg Kroah-Hartman 
2080ab4382d2SGreg Kroah-Hartman 	if (flow == 'r')
2081ab4382d2SGreg Kroah-Hartman 		termios.c_cflag |= CRTSCTS;
2082ab4382d2SGreg Kroah-Hartman 
2083ab4382d2SGreg Kroah-Hartman 	/*
2084ab4382d2SGreg Kroah-Hartman 	 * some uarts on other side don't support no flow control.
2085ab4382d2SGreg Kroah-Hartman 	 * So we set * DTR in host uart to make them happy
2086ab4382d2SGreg Kroah-Hartman 	 */
2087ab4382d2SGreg Kroah-Hartman 	port->mctrl |= TIOCM_DTR;
2088ab4382d2SGreg Kroah-Hartman 
2089ab4382d2SGreg Kroah-Hartman 	port->ops->set_termios(port, &termios, &dummy);
2090ab4382d2SGreg Kroah-Hartman 	/*
2091ab4382d2SGreg Kroah-Hartman 	 * Allow the setting of the UART parameters with a NULL console
2092ab4382d2SGreg Kroah-Hartman 	 * too:
2093ab4382d2SGreg Kroah-Hartman 	 */
2094ab4382d2SGreg Kroah-Hartman 	if (co)
2095ab4382d2SGreg Kroah-Hartman 		co->cflag = termios.c_cflag;
2096ab4382d2SGreg Kroah-Hartman 
2097ab4382d2SGreg Kroah-Hartman 	return 0;
2098ab4382d2SGreg Kroah-Hartman }
2099ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_set_options);
2100ab4382d2SGreg Kroah-Hartman #endif /* CONFIG_SERIAL_CORE_CONSOLE */
2101ab4382d2SGreg Kroah-Hartman 
2102cf75525fSJiri Slaby /**
2103cf75525fSJiri Slaby  * uart_change_pm - set power state of the port
2104cf75525fSJiri Slaby  *
2105cf75525fSJiri Slaby  * @state: port descriptor
2106cf75525fSJiri Slaby  * @pm_state: new state
2107cf75525fSJiri Slaby  *
2108cf75525fSJiri Slaby  * Locking: port->mutex has to be held
2109cf75525fSJiri Slaby  */
21106f538fe3SLinus Walleij static void uart_change_pm(struct uart_state *state,
21116f538fe3SLinus Walleij 			   enum uart_pm_state pm_state)
2112ab4382d2SGreg Kroah-Hartman {
21134047b371SPeter Hurley 	struct uart_port *port = uart_port_check(state);
2114ab4382d2SGreg Kroah-Hartman 
2115ab4382d2SGreg Kroah-Hartman 	if (state->pm_state != pm_state) {
21164047b371SPeter Hurley 		if (port && port->ops->pm)
2117ab4382d2SGreg Kroah-Hartman 			port->ops->pm(port, pm_state, state->pm_state);
2118ab4382d2SGreg Kroah-Hartman 		state->pm_state = pm_state;
2119ab4382d2SGreg Kroah-Hartman 	}
2120ab4382d2SGreg Kroah-Hartman }
2121ab4382d2SGreg Kroah-Hartman 
2122ab4382d2SGreg Kroah-Hartman struct uart_match {
2123ab4382d2SGreg Kroah-Hartman 	struct uart_port *port;
2124ab4382d2SGreg Kroah-Hartman 	struct uart_driver *driver;
2125ab4382d2SGreg Kroah-Hartman };
2126ab4382d2SGreg Kroah-Hartman 
2127ab4382d2SGreg Kroah-Hartman static int serial_match_port(struct device *dev, void *data)
2128ab4382d2SGreg Kroah-Hartman {
2129ab4382d2SGreg Kroah-Hartman 	struct uart_match *match = data;
2130ab4382d2SGreg Kroah-Hartman 	struct tty_driver *tty_drv = match->driver->tty_driver;
2131ab4382d2SGreg Kroah-Hartman 	dev_t devt = MKDEV(tty_drv->major, tty_drv->minor_start) +
2132ab4382d2SGreg Kroah-Hartman 		match->port->line;
2133ab4382d2SGreg Kroah-Hartman 
2134ab4382d2SGreg Kroah-Hartman 	return dev->devt == devt; /* Actually, only one tty per port */
2135ab4382d2SGreg Kroah-Hartman }
2136ab4382d2SGreg Kroah-Hartman 
2137ab4382d2SGreg Kroah-Hartman int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport)
2138ab4382d2SGreg Kroah-Hartman {
2139ab4382d2SGreg Kroah-Hartman 	struct uart_state *state = drv->state + uport->line;
2140ab4382d2SGreg Kroah-Hartman 	struct tty_port *port = &state->port;
2141ab4382d2SGreg Kroah-Hartman 	struct device *tty_dev;
2142ab4382d2SGreg Kroah-Hartman 	struct uart_match match = {uport, drv};
2143ab4382d2SGreg Kroah-Hartman 
2144ab4382d2SGreg Kroah-Hartman 	mutex_lock(&port->mutex);
2145ab4382d2SGreg Kroah-Hartman 
2146ab4382d2SGreg Kroah-Hartman 	tty_dev = device_find_child(uport->dev, &match, serial_match_port);
214788e2582eSLucas Stach 	if (tty_dev && device_may_wakeup(tty_dev)) {
2148aef3ad10SAndy Shevchenko 		enable_irq_wake(uport->irq);
2149ab4382d2SGreg Kroah-Hartman 		put_device(tty_dev);
2150ab4382d2SGreg Kroah-Hartman 		mutex_unlock(&port->mutex);
2151ab4382d2SGreg Kroah-Hartman 		return 0;
2152ab4382d2SGreg Kroah-Hartman 	}
21535a65dcc0SFederico Vaga 	put_device(tty_dev);
21545a65dcc0SFederico Vaga 
2155b164c972SPeter Hurley 	/* Nothing to do if the console is not suspending */
2156b164c972SPeter Hurley 	if (!console_suspend_enabled && uart_console(uport))
2157b164c972SPeter Hurley 		goto unlock;
2158b164c972SPeter Hurley 
2159ab4382d2SGreg Kroah-Hartman 	uport->suspended = 1;
2160ab4382d2SGreg Kroah-Hartman 
2161d41861caSPeter Hurley 	if (tty_port_initialized(port)) {
2162ab4382d2SGreg Kroah-Hartman 		const struct uart_ops *ops = uport->ops;
2163ab4382d2SGreg Kroah-Hartman 		int tries;
2164ab4382d2SGreg Kroah-Hartman 
216580f02d54SPeter Hurley 		tty_port_set_suspended(port, 1);
2166d41861caSPeter Hurley 		tty_port_set_initialized(port, 0);
2167ab4382d2SGreg Kroah-Hartman 
2168ab4382d2SGreg Kroah-Hartman 		spin_lock_irq(&uport->lock);
2169ab4382d2SGreg Kroah-Hartman 		ops->stop_tx(uport);
2170ab4382d2SGreg Kroah-Hartman 		ops->set_mctrl(uport, 0);
2171ab4382d2SGreg Kroah-Hartman 		ops->stop_rx(uport);
2172ab4382d2SGreg Kroah-Hartman 		spin_unlock_irq(&uport->lock);
2173ab4382d2SGreg Kroah-Hartman 
2174ab4382d2SGreg Kroah-Hartman 		/*
2175ab4382d2SGreg Kroah-Hartman 		 * Wait for the transmitter to empty.
2176ab4382d2SGreg Kroah-Hartman 		 */
2177ab4382d2SGreg Kroah-Hartman 		for (tries = 3; !ops->tx_empty(uport) && tries; tries--)
2178ab4382d2SGreg Kroah-Hartman 			msleep(10);
2179ab4382d2SGreg Kroah-Hartman 		if (!tries)
2180cade3580SAndy Shevchenko 			dev_err(uport->dev, "%s: Unable to drain transmitter\n",
2181cade3580SAndy Shevchenko 				uport->name);
2182ab4382d2SGreg Kroah-Hartman 
2183ab4382d2SGreg Kroah-Hartman 		ops->shutdown(uport);
2184ab4382d2SGreg Kroah-Hartman 	}
2185ab4382d2SGreg Kroah-Hartman 
2186ab4382d2SGreg Kroah-Hartman 	/*
2187ab4382d2SGreg Kroah-Hartman 	 * Disable the console device before suspending.
2188ab4382d2SGreg Kroah-Hartman 	 */
2189b164c972SPeter Hurley 	if (uart_console(uport))
2190ab4382d2SGreg Kroah-Hartman 		console_stop(uport->cons);
2191ab4382d2SGreg Kroah-Hartman 
21926f538fe3SLinus Walleij 	uart_change_pm(state, UART_PM_STATE_OFF);
2193b164c972SPeter Hurley unlock:
2194ab4382d2SGreg Kroah-Hartman 	mutex_unlock(&port->mutex);
2195ab4382d2SGreg Kroah-Hartman 
2196ab4382d2SGreg Kroah-Hartman 	return 0;
2197ab4382d2SGreg Kroah-Hartman }
2198ab4382d2SGreg Kroah-Hartman 
2199ab4382d2SGreg Kroah-Hartman int uart_resume_port(struct uart_driver *drv, struct uart_port *uport)
2200ab4382d2SGreg Kroah-Hartman {
2201ab4382d2SGreg Kroah-Hartman 	struct uart_state *state = drv->state + uport->line;
2202ab4382d2SGreg Kroah-Hartman 	struct tty_port *port = &state->port;
2203ab4382d2SGreg Kroah-Hartman 	struct device *tty_dev;
2204ab4382d2SGreg Kroah-Hartman 	struct uart_match match = {uport, drv};
2205ab4382d2SGreg Kroah-Hartman 	struct ktermios termios;
2206ab4382d2SGreg Kroah-Hartman 
2207ab4382d2SGreg Kroah-Hartman 	mutex_lock(&port->mutex);
2208ab4382d2SGreg Kroah-Hartman 
2209ab4382d2SGreg Kroah-Hartman 	tty_dev = device_find_child(uport->dev, &match, serial_match_port);
2210ab4382d2SGreg Kroah-Hartman 	if (!uport->suspended && device_may_wakeup(tty_dev)) {
2211aef3ad10SAndy Shevchenko 		if (irqd_is_wakeup_set(irq_get_irq_data((uport->irq))))
2212ab4382d2SGreg Kroah-Hartman 			disable_irq_wake(uport->irq);
22135a65dcc0SFederico Vaga 		put_device(tty_dev);
2214ab4382d2SGreg Kroah-Hartman 		mutex_unlock(&port->mutex);
2215ab4382d2SGreg Kroah-Hartman 		return 0;
2216ab4382d2SGreg Kroah-Hartman 	}
22175a65dcc0SFederico Vaga 	put_device(tty_dev);
2218ab4382d2SGreg Kroah-Hartman 	uport->suspended = 0;
2219ab4382d2SGreg Kroah-Hartman 
2220ab4382d2SGreg Kroah-Hartman 	/*
2221ab4382d2SGreg Kroah-Hartman 	 * Re-enable the console device after suspending.
2222ab4382d2SGreg Kroah-Hartman 	 */
22235933a161SYin Kangkai 	if (uart_console(uport)) {
2224ab4382d2SGreg Kroah-Hartman 		/*
2225ab4382d2SGreg Kroah-Hartman 		 * First try to use the console cflag setting.
2226ab4382d2SGreg Kroah-Hartman 		 */
2227ab4382d2SGreg Kroah-Hartman 		memset(&termios, 0, sizeof(struct ktermios));
2228ab4382d2SGreg Kroah-Hartman 		termios.c_cflag = uport->cons->cflag;
2229ab4382d2SGreg Kroah-Hartman 
2230ab4382d2SGreg Kroah-Hartman 		/*
2231ab4382d2SGreg Kroah-Hartman 		 * If that's unset, use the tty termios setting.
2232ab4382d2SGreg Kroah-Hartman 		 */
2233adc8d746SAlan Cox 		if (port->tty && termios.c_cflag == 0)
2234adc8d746SAlan Cox 			termios = port->tty->termios;
2235ab4382d2SGreg Kroah-Hartman 
223694abc56fSNing Jiang 		if (console_suspend_enabled)
22376f538fe3SLinus Walleij 			uart_change_pm(state, UART_PM_STATE_ON);
2238ab4382d2SGreg Kroah-Hartman 		uport->ops->set_termios(uport, &termios, NULL);
22395933a161SYin Kangkai 		if (console_suspend_enabled)
2240ab4382d2SGreg Kroah-Hartman 			console_start(uport->cons);
2241ab4382d2SGreg Kroah-Hartman 	}
2242ab4382d2SGreg Kroah-Hartman 
224380f02d54SPeter Hurley 	if (tty_port_suspended(port)) {
2244ab4382d2SGreg Kroah-Hartman 		const struct uart_ops *ops = uport->ops;
2245ab4382d2SGreg Kroah-Hartman 		int ret;
2246ab4382d2SGreg Kroah-Hartman 
22476f538fe3SLinus Walleij 		uart_change_pm(state, UART_PM_STATE_ON);
2248ab4382d2SGreg Kroah-Hartman 		spin_lock_irq(&uport->lock);
2249ab4382d2SGreg Kroah-Hartman 		ops->set_mctrl(uport, 0);
2250ab4382d2SGreg Kroah-Hartman 		spin_unlock_irq(&uport->lock);
2251ab4382d2SGreg Kroah-Hartman 		if (console_suspend_enabled || !uart_console(uport)) {
2252ab4382d2SGreg Kroah-Hartman 			/* Protected by port mutex for now */
2253ab4382d2SGreg Kroah-Hartman 			struct tty_struct *tty = port->tty;
2254ab4382d2SGreg Kroah-Hartman 			ret = ops->startup(uport);
2255ab4382d2SGreg Kroah-Hartman 			if (ret == 0) {
2256ab4382d2SGreg Kroah-Hartman 				if (tty)
2257ab4382d2SGreg Kroah-Hartman 					uart_change_speed(tty, state, NULL);
2258ab4382d2SGreg Kroah-Hartman 				spin_lock_irq(&uport->lock);
2259ab4382d2SGreg Kroah-Hartman 				ops->set_mctrl(uport, uport->mctrl);
2260ab4382d2SGreg Kroah-Hartman 				ops->start_tx(uport);
2261ab4382d2SGreg Kroah-Hartman 				spin_unlock_irq(&uport->lock);
2262d41861caSPeter Hurley 				tty_port_set_initialized(port, 1);
2263ab4382d2SGreg Kroah-Hartman 			} else {
2264ab4382d2SGreg Kroah-Hartman 				/*
2265ab4382d2SGreg Kroah-Hartman 				 * Failed to resume - maybe hardware went away?
2266ab4382d2SGreg Kroah-Hartman 				 * Clear the "initialized" flag so we won't try
2267ab4382d2SGreg Kroah-Hartman 				 * to call the low level drivers shutdown method.
2268ab4382d2SGreg Kroah-Hartman 				 */
2269ab4382d2SGreg Kroah-Hartman 				uart_shutdown(tty, state);
2270ab4382d2SGreg Kroah-Hartman 			}
2271ab4382d2SGreg Kroah-Hartman 		}
2272ab4382d2SGreg Kroah-Hartman 
227380f02d54SPeter Hurley 		tty_port_set_suspended(port, 0);
2274ab4382d2SGreg Kroah-Hartman 	}
2275ab4382d2SGreg Kroah-Hartman 
2276ab4382d2SGreg Kroah-Hartman 	mutex_unlock(&port->mutex);
2277ab4382d2SGreg Kroah-Hartman 
2278ab4382d2SGreg Kroah-Hartman 	return 0;
2279ab4382d2SGreg Kroah-Hartman }
2280ab4382d2SGreg Kroah-Hartman 
2281ab4382d2SGreg Kroah-Hartman static inline void
2282ab4382d2SGreg Kroah-Hartman uart_report_port(struct uart_driver *drv, struct uart_port *port)
2283ab4382d2SGreg Kroah-Hartman {
2284ab4382d2SGreg Kroah-Hartman 	char address[64];
2285ab4382d2SGreg Kroah-Hartman 
2286ab4382d2SGreg Kroah-Hartman 	switch (port->iotype) {
2287ab4382d2SGreg Kroah-Hartman 	case UPIO_PORT:
2288ab4382d2SGreg Kroah-Hartman 		snprintf(address, sizeof(address), "I/O 0x%lx", port->iobase);
2289ab4382d2SGreg Kroah-Hartman 		break;
2290ab4382d2SGreg Kroah-Hartman 	case UPIO_HUB6:
2291ab4382d2SGreg Kroah-Hartman 		snprintf(address, sizeof(address),
2292ab4382d2SGreg Kroah-Hartman 			 "I/O 0x%lx offset 0x%x", port->iobase, port->hub6);
2293ab4382d2SGreg Kroah-Hartman 		break;
2294ab4382d2SGreg Kroah-Hartman 	case UPIO_MEM:
2295bd94c407SMasahiro Yamada 	case UPIO_MEM16:
2296ab4382d2SGreg Kroah-Hartman 	case UPIO_MEM32:
22973ffb1a81SKevin Cernekee 	case UPIO_MEM32BE:
2298ab4382d2SGreg Kroah-Hartman 	case UPIO_AU:
2299ab4382d2SGreg Kroah-Hartman 	case UPIO_TSI:
2300ab4382d2SGreg Kroah-Hartman 		snprintf(address, sizeof(address),
2301ab4382d2SGreg Kroah-Hartman 			 "MMIO 0x%llx", (unsigned long long)port->mapbase);
2302ab4382d2SGreg Kroah-Hartman 		break;
2303ab4382d2SGreg Kroah-Hartman 	default:
2304ab4382d2SGreg Kroah-Hartman 		strlcpy(address, "*unknown*", sizeof(address));
2305ab4382d2SGreg Kroah-Hartman 		break;
2306ab4382d2SGreg Kroah-Hartman 	}
2307ab4382d2SGreg Kroah-Hartman 
2308cade3580SAndy Shevchenko 	pr_info("%s%s%s at %s (irq = %d, base_baud = %d) is a %s\n",
230968ed7e1cSJames Bottomley 	       port->dev ? dev_name(port->dev) : "",
231068ed7e1cSJames Bottomley 	       port->dev ? ": " : "",
2311cade3580SAndy Shevchenko 	       port->name,
23127d12b976SKees Cook 	       address, port->irq, port->uartclk / 16, uart_type(port));
2313ab4382d2SGreg Kroah-Hartman }
2314ab4382d2SGreg Kroah-Hartman 
2315ab4382d2SGreg Kroah-Hartman static void
2316ab4382d2SGreg Kroah-Hartman uart_configure_port(struct uart_driver *drv, struct uart_state *state,
2317ab4382d2SGreg Kroah-Hartman 		    struct uart_port *port)
2318ab4382d2SGreg Kroah-Hartman {
2319ab4382d2SGreg Kroah-Hartman 	unsigned int flags;
2320ab4382d2SGreg Kroah-Hartman 
2321ab4382d2SGreg Kroah-Hartman 	/*
2322ab4382d2SGreg Kroah-Hartman 	 * If there isn't a port here, don't do anything further.
2323ab4382d2SGreg Kroah-Hartman 	 */
2324ab4382d2SGreg Kroah-Hartman 	if (!port->iobase && !port->mapbase && !port->membase)
2325ab4382d2SGreg Kroah-Hartman 		return;
2326ab4382d2SGreg Kroah-Hartman 
2327ab4382d2SGreg Kroah-Hartman 	/*
2328ab4382d2SGreg Kroah-Hartman 	 * Now do the auto configuration stuff.  Note that config_port
2329ab4382d2SGreg Kroah-Hartman 	 * is expected to claim the resources and map the port for us.
2330ab4382d2SGreg Kroah-Hartman 	 */
2331ab4382d2SGreg Kroah-Hartman 	flags = 0;
2332ab4382d2SGreg Kroah-Hartman 	if (port->flags & UPF_AUTO_IRQ)
2333ab4382d2SGreg Kroah-Hartman 		flags |= UART_CONFIG_IRQ;
2334ab4382d2SGreg Kroah-Hartman 	if (port->flags & UPF_BOOT_AUTOCONF) {
2335ab4382d2SGreg Kroah-Hartman 		if (!(port->flags & UPF_FIXED_TYPE)) {
2336ab4382d2SGreg Kroah-Hartman 			port->type = PORT_UNKNOWN;
2337ab4382d2SGreg Kroah-Hartman 			flags |= UART_CONFIG_TYPE;
2338ab4382d2SGreg Kroah-Hartman 		}
2339ab4382d2SGreg Kroah-Hartman 		port->ops->config_port(port, flags);
2340ab4382d2SGreg Kroah-Hartman 	}
2341ab4382d2SGreg Kroah-Hartman 
2342ab4382d2SGreg Kroah-Hartman 	if (port->type != PORT_UNKNOWN) {
2343ab4382d2SGreg Kroah-Hartman 		unsigned long flags;
2344ab4382d2SGreg Kroah-Hartman 
2345ab4382d2SGreg Kroah-Hartman 		uart_report_port(drv, port);
2346ab4382d2SGreg Kroah-Hartman 
2347ab4382d2SGreg Kroah-Hartman 		/* Power up port for set_mctrl() */
23486f538fe3SLinus Walleij 		uart_change_pm(state, UART_PM_STATE_ON);
2349ab4382d2SGreg Kroah-Hartman 
2350ab4382d2SGreg Kroah-Hartman 		/*
2351ab4382d2SGreg Kroah-Hartman 		 * Ensure that the modem control lines are de-activated.
2352ab4382d2SGreg Kroah-Hartman 		 * keep the DTR setting that is set in uart_set_options()
2353ab4382d2SGreg Kroah-Hartman 		 * We probably don't need a spinlock around this, but
2354ab4382d2SGreg Kroah-Hartman 		 */
2355ab4382d2SGreg Kroah-Hartman 		spin_lock_irqsave(&port->lock, flags);
2356ab4382d2SGreg Kroah-Hartman 		port->ops->set_mctrl(port, port->mctrl & TIOCM_DTR);
2357ab4382d2SGreg Kroah-Hartman 		spin_unlock_irqrestore(&port->lock, flags);
2358ab4382d2SGreg Kroah-Hartman 
2359ab4382d2SGreg Kroah-Hartman 		/*
2360ab4382d2SGreg Kroah-Hartman 		 * If this driver supports console, and it hasn't been
2361ab4382d2SGreg Kroah-Hartman 		 * successfully registered yet, try to re-register it.
2362ab4382d2SGreg Kroah-Hartman 		 * It may be that the port was not available.
2363ab4382d2SGreg Kroah-Hartman 		 */
2364ab4382d2SGreg Kroah-Hartman 		if (port->cons && !(port->cons->flags & CON_ENABLED))
2365ab4382d2SGreg Kroah-Hartman 			register_console(port->cons);
2366ab4382d2SGreg Kroah-Hartman 
2367ab4382d2SGreg Kroah-Hartman 		/*
2368ab4382d2SGreg Kroah-Hartman 		 * Power down all ports by default, except the
2369ab4382d2SGreg Kroah-Hartman 		 * console if we have one.
2370ab4382d2SGreg Kroah-Hartman 		 */
2371ab4382d2SGreg Kroah-Hartman 		if (!uart_console(port))
23726f538fe3SLinus Walleij 			uart_change_pm(state, UART_PM_STATE_OFF);
2373ab4382d2SGreg Kroah-Hartman 	}
2374ab4382d2SGreg Kroah-Hartman }
2375ab4382d2SGreg Kroah-Hartman 
2376ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL
2377ab4382d2SGreg Kroah-Hartman 
2378ab4382d2SGreg Kroah-Hartman static int uart_poll_init(struct tty_driver *driver, int line, char *options)
2379ab4382d2SGreg Kroah-Hartman {
2380ab4382d2SGreg Kroah-Hartman 	struct uart_driver *drv = driver->driver_state;
2381ab4382d2SGreg Kroah-Hartman 	struct uart_state *state = drv->state + line;
238249c02304SPeter Hurley 	struct tty_port *tport;
2383ab4382d2SGreg Kroah-Hartman 	struct uart_port *port;
2384ab4382d2SGreg Kroah-Hartman 	int baud = 9600;
2385ab4382d2SGreg Kroah-Hartman 	int bits = 8;
2386ab4382d2SGreg Kroah-Hartman 	int parity = 'n';
2387ab4382d2SGreg Kroah-Hartman 	int flow = 'n';
238849c02304SPeter Hurley 	int ret = 0;
2389ab4382d2SGreg Kroah-Hartman 
239049c02304SPeter Hurley 	tport = &state->port;
239149c02304SPeter Hurley 	mutex_lock(&tport->mutex);
239249c02304SPeter Hurley 
23934047b371SPeter Hurley 	port = uart_port_check(state);
23944047b371SPeter Hurley 	if (!port || !(port->ops->poll_get_char && port->ops->poll_put_char)) {
239549c02304SPeter Hurley 		ret = -1;
239649c02304SPeter Hurley 		goto out;
239749c02304SPeter Hurley 	}
2398ab4382d2SGreg Kroah-Hartman 
2399c7f3e708SAnton Vorontsov 	if (port->ops->poll_init) {
2400c7f3e708SAnton Vorontsov 		/*
2401d41861caSPeter Hurley 		 * We don't set initialized as we only initialized the hw,
2402d41861caSPeter Hurley 		 * e.g. state->xmit is still uninitialized.
2403c7f3e708SAnton Vorontsov 		 */
2404d41861caSPeter Hurley 		if (!tty_port_initialized(tport))
2405c7f3e708SAnton Vorontsov 			ret = port->ops->poll_init(port);
2406c7f3e708SAnton Vorontsov 	}
2407c7f3e708SAnton Vorontsov 
240849c02304SPeter Hurley 	if (!ret && options) {
2409ab4382d2SGreg Kroah-Hartman 		uart_parse_options(options, &baud, &parity, &bits, &flow);
241049c02304SPeter Hurley 		ret = uart_set_options(port, NULL, baud, parity, bits, flow);
2411ab4382d2SGreg Kroah-Hartman 	}
241249c02304SPeter Hurley out:
241349c02304SPeter Hurley 	mutex_unlock(&tport->mutex);
241449c02304SPeter Hurley 	return ret;
2415ab4382d2SGreg Kroah-Hartman }
2416ab4382d2SGreg Kroah-Hartman 
2417ab4382d2SGreg Kroah-Hartman static int uart_poll_get_char(struct tty_driver *driver, int line)
2418ab4382d2SGreg Kroah-Hartman {
2419ab4382d2SGreg Kroah-Hartman 	struct uart_driver *drv = driver->driver_state;
2420ab4382d2SGreg Kroah-Hartman 	struct uart_state *state = drv->state + line;
2421ab4382d2SGreg Kroah-Hartman 	struct uart_port *port;
24229ed19428SPeter Hurley 	int ret = -1;
2423ab4382d2SGreg Kroah-Hartman 
24249ed19428SPeter Hurley 	port = uart_port_ref(state);
2425ef510beaSAndy Shevchenko 	if (port) {
24269ed19428SPeter Hurley 		ret = port->ops->poll_get_char(port);
24279ed19428SPeter Hurley 		uart_port_deref(port);
24289ed19428SPeter Hurley 	}
242922077b09SJiri Slaby 
24309ed19428SPeter Hurley 	return ret;
2431ab4382d2SGreg Kroah-Hartman }
2432ab4382d2SGreg Kroah-Hartman 
2433ab4382d2SGreg Kroah-Hartman static void uart_poll_put_char(struct tty_driver *driver, int line, char ch)
2434ab4382d2SGreg Kroah-Hartman {
2435ab4382d2SGreg Kroah-Hartman 	struct uart_driver *drv = driver->driver_state;
2436ab4382d2SGreg Kroah-Hartman 	struct uart_state *state = drv->state + line;
2437ab4382d2SGreg Kroah-Hartman 	struct uart_port *port;
2438ab4382d2SGreg Kroah-Hartman 
24399ed19428SPeter Hurley 	port = uart_port_ref(state);
24409ed19428SPeter Hurley 	if (!port)
24419ed19428SPeter Hurley 		return;
2442c7d44a02SDoug Anderson 
2443c7d44a02SDoug Anderson 	if (ch == '\n')
2444c7d44a02SDoug Anderson 		port->ops->poll_put_char(port, '\r');
2445ab4382d2SGreg Kroah-Hartman 	port->ops->poll_put_char(port, ch);
24469ed19428SPeter Hurley 	uart_port_deref(port);
2447ab4382d2SGreg Kroah-Hartman }
2448ab4382d2SGreg Kroah-Hartman #endif
2449ab4382d2SGreg Kroah-Hartman 
2450ab4382d2SGreg Kroah-Hartman static const struct tty_operations uart_ops = {
2451ab4382d2SGreg Kroah-Hartman 	.open		= uart_open,
2452ab4382d2SGreg Kroah-Hartman 	.close		= uart_close,
2453ab4382d2SGreg Kroah-Hartman 	.write		= uart_write,
2454ab4382d2SGreg Kroah-Hartman 	.put_char	= uart_put_char,
2455ab4382d2SGreg Kroah-Hartman 	.flush_chars	= uart_flush_chars,
2456ab4382d2SGreg Kroah-Hartman 	.write_room	= uart_write_room,
2457ab4382d2SGreg Kroah-Hartman 	.chars_in_buffer= uart_chars_in_buffer,
2458ab4382d2SGreg Kroah-Hartman 	.flush_buffer	= uart_flush_buffer,
2459ab4382d2SGreg Kroah-Hartman 	.ioctl		= uart_ioctl,
2460ab4382d2SGreg Kroah-Hartman 	.throttle	= uart_throttle,
2461ab4382d2SGreg Kroah-Hartman 	.unthrottle	= uart_unthrottle,
2462ab4382d2SGreg Kroah-Hartman 	.send_xchar	= uart_send_xchar,
2463ab4382d2SGreg Kroah-Hartman 	.set_termios	= uart_set_termios,
2464ab4382d2SGreg Kroah-Hartman 	.set_ldisc	= uart_set_ldisc,
2465ab4382d2SGreg Kroah-Hartman 	.stop		= uart_stop,
2466ab4382d2SGreg Kroah-Hartman 	.start		= uart_start,
2467ab4382d2SGreg Kroah-Hartman 	.hangup		= uart_hangup,
2468ab4382d2SGreg Kroah-Hartman 	.break_ctl	= uart_break_ctl,
2469ab4382d2SGreg Kroah-Hartman 	.wait_until_sent= uart_wait_until_sent,
2470ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS
24718a8dcabfSChristoph Hellwig 	.proc_show	= uart_proc_show,
2472ab4382d2SGreg Kroah-Hartman #endif
2473ab4382d2SGreg Kroah-Hartman 	.tiocmget	= uart_tiocmget,
2474ab4382d2SGreg Kroah-Hartman 	.tiocmset	= uart_tiocmset,
24755099d234SAl Viro 	.set_serial	= uart_set_info_user,
24765099d234SAl Viro 	.get_serial	= uart_get_info_user,
2477ab4382d2SGreg Kroah-Hartman 	.get_icount	= uart_get_icount,
2478ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL
2479ab4382d2SGreg Kroah-Hartman 	.poll_init	= uart_poll_init,
2480ab4382d2SGreg Kroah-Hartman 	.poll_get_char	= uart_poll_get_char,
2481ab4382d2SGreg Kroah-Hartman 	.poll_put_char	= uart_poll_put_char,
2482ab4382d2SGreg Kroah-Hartman #endif
2483ab4382d2SGreg Kroah-Hartman };
2484ab4382d2SGreg Kroah-Hartman 
2485ab4382d2SGreg Kroah-Hartman static const struct tty_port_operations uart_port_ops = {
2486ab4382d2SGreg Kroah-Hartman 	.carrier_raised = uart_carrier_raised,
2487ab4382d2SGreg Kroah-Hartman 	.dtr_rts	= uart_dtr_rts,
2488b3b57646SRob Herring 	.activate	= uart_port_activate,
2489761ed4a9SRob Herring 	.shutdown	= uart_tty_port_shutdown,
2490ab4382d2SGreg Kroah-Hartman };
2491ab4382d2SGreg Kroah-Hartman 
2492ab4382d2SGreg Kroah-Hartman /**
2493ab4382d2SGreg Kroah-Hartman  *	uart_register_driver - register a driver with the uart core layer
2494ab4382d2SGreg Kroah-Hartman  *	@drv: low level driver structure
2495ab4382d2SGreg Kroah-Hartman  *
2496ab4382d2SGreg Kroah-Hartman  *	Register a uart driver with the core driver.  We in turn register
2497ab4382d2SGreg Kroah-Hartman  *	with the tty layer, and initialise the core driver per-port state.
2498ab4382d2SGreg Kroah-Hartman  *
2499ab4382d2SGreg Kroah-Hartman  *	We have a proc file in /proc/tty/driver which is named after the
2500ab4382d2SGreg Kroah-Hartman  *	normal driver.
2501ab4382d2SGreg Kroah-Hartman  *
2502ab4382d2SGreg Kroah-Hartman  *	drv->port should be NULL, and the per-port structures should be
2503ab4382d2SGreg Kroah-Hartman  *	registered using uart_add_one_port after this call has succeeded.
2504ab4382d2SGreg Kroah-Hartman  */
2505ab4382d2SGreg Kroah-Hartman int uart_register_driver(struct uart_driver *drv)
2506ab4382d2SGreg Kroah-Hartman {
2507ab4382d2SGreg Kroah-Hartman 	struct tty_driver *normal;
2508ab4382d2SGreg Kroah-Hartman 	int i, retval;
2509ab4382d2SGreg Kroah-Hartman 
2510ab4382d2SGreg Kroah-Hartman 	BUG_ON(drv->state);
2511ab4382d2SGreg Kroah-Hartman 
2512ab4382d2SGreg Kroah-Hartman 	/*
2513ab4382d2SGreg Kroah-Hartman 	 * Maybe we should be using a slab cache for this, especially if
2514ab4382d2SGreg Kroah-Hartman 	 * we have a large number of ports to handle.
2515ab4382d2SGreg Kroah-Hartman 	 */
25166396bb22SKees Cook 	drv->state = kcalloc(drv->nr, sizeof(struct uart_state), GFP_KERNEL);
2517ab4382d2SGreg Kroah-Hartman 	if (!drv->state)
2518ab4382d2SGreg Kroah-Hartman 		goto out;
2519ab4382d2SGreg Kroah-Hartman 
2520ab4382d2SGreg Kroah-Hartman 	normal = alloc_tty_driver(drv->nr);
2521ab4382d2SGreg Kroah-Hartman 	if (!normal)
2522ab4382d2SGreg Kroah-Hartman 		goto out_kfree;
2523ab4382d2SGreg Kroah-Hartman 
2524ab4382d2SGreg Kroah-Hartman 	drv->tty_driver = normal;
2525ab4382d2SGreg Kroah-Hartman 
2526ab4382d2SGreg Kroah-Hartman 	normal->driver_name	= drv->driver_name;
2527ab4382d2SGreg Kroah-Hartman 	normal->name		= drv->dev_name;
2528ab4382d2SGreg Kroah-Hartman 	normal->major		= drv->major;
2529ab4382d2SGreg Kroah-Hartman 	normal->minor_start	= drv->minor;
2530ab4382d2SGreg Kroah-Hartman 	normal->type		= TTY_DRIVER_TYPE_SERIAL;
2531ab4382d2SGreg Kroah-Hartman 	normal->subtype		= SERIAL_TYPE_NORMAL;
2532ab4382d2SGreg Kroah-Hartman 	normal->init_termios	= tty_std_termios;
2533ab4382d2SGreg Kroah-Hartman 	normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2534ab4382d2SGreg Kroah-Hartman 	normal->init_termios.c_ispeed = normal->init_termios.c_ospeed = 9600;
2535ab4382d2SGreg Kroah-Hartman 	normal->flags		= TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
2536ab4382d2SGreg Kroah-Hartman 	normal->driver_state    = drv;
2537ab4382d2SGreg Kroah-Hartman 	tty_set_operations(normal, &uart_ops);
2538ab4382d2SGreg Kroah-Hartman 
2539ab4382d2SGreg Kroah-Hartman 	/*
2540ab4382d2SGreg Kroah-Hartman 	 * Initialise the UART state(s).
2541ab4382d2SGreg Kroah-Hartman 	 */
2542ab4382d2SGreg Kroah-Hartman 	for (i = 0; i < drv->nr; i++) {
2543ab4382d2SGreg Kroah-Hartman 		struct uart_state *state = drv->state + i;
2544ab4382d2SGreg Kroah-Hartman 		struct tty_port *port = &state->port;
2545ab4382d2SGreg Kroah-Hartman 
2546ab4382d2SGreg Kroah-Hartman 		tty_port_init(port);
2547ab4382d2SGreg Kroah-Hartman 		port->ops = &uart_port_ops;
2548ab4382d2SGreg Kroah-Hartman 	}
2549ab4382d2SGreg Kroah-Hartman 
2550ab4382d2SGreg Kroah-Hartman 	retval = tty_register_driver(normal);
2551ab4382d2SGreg Kroah-Hartman 	if (retval >= 0)
2552ab4382d2SGreg Kroah-Hartman 		return retval;
2553ab4382d2SGreg Kroah-Hartman 
2554191c5f10SJiri Slaby 	for (i = 0; i < drv->nr; i++)
2555191c5f10SJiri Slaby 		tty_port_destroy(&drv->state[i].port);
2556ab4382d2SGreg Kroah-Hartman 	put_tty_driver(normal);
2557ab4382d2SGreg Kroah-Hartman out_kfree:
2558ab4382d2SGreg Kroah-Hartman 	kfree(drv->state);
2559ab4382d2SGreg Kroah-Hartman out:
2560ab4382d2SGreg Kroah-Hartman 	return -ENOMEM;
2561ab4382d2SGreg Kroah-Hartman }
2562ab4382d2SGreg Kroah-Hartman 
2563ab4382d2SGreg Kroah-Hartman /**
2564ab4382d2SGreg Kroah-Hartman  *	uart_unregister_driver - remove a driver from the uart core layer
2565ab4382d2SGreg Kroah-Hartman  *	@drv: low level driver structure
2566ab4382d2SGreg Kroah-Hartman  *
2567ab4382d2SGreg Kroah-Hartman  *	Remove all references to a driver from the core driver.  The low
2568ab4382d2SGreg Kroah-Hartman  *	level driver must have removed all its ports via the
2569ab4382d2SGreg Kroah-Hartman  *	uart_remove_one_port() if it registered them with uart_add_one_port().
2570ab4382d2SGreg Kroah-Hartman  *	(ie, drv->port == NULL)
2571ab4382d2SGreg Kroah-Hartman  */
2572ab4382d2SGreg Kroah-Hartman void uart_unregister_driver(struct uart_driver *drv)
2573ab4382d2SGreg Kroah-Hartman {
2574ab4382d2SGreg Kroah-Hartman 	struct tty_driver *p = drv->tty_driver;
2575191c5f10SJiri Slaby 	unsigned int i;
2576191c5f10SJiri Slaby 
2577ab4382d2SGreg Kroah-Hartman 	tty_unregister_driver(p);
2578ab4382d2SGreg Kroah-Hartman 	put_tty_driver(p);
2579191c5f10SJiri Slaby 	for (i = 0; i < drv->nr; i++)
2580191c5f10SJiri Slaby 		tty_port_destroy(&drv->state[i].port);
2581ab4382d2SGreg Kroah-Hartman 	kfree(drv->state);
25821e66cdedSAlan Cox 	drv->state = NULL;
2583ab4382d2SGreg Kroah-Hartman 	drv->tty_driver = NULL;
2584ab4382d2SGreg Kroah-Hartman }
2585ab4382d2SGreg Kroah-Hartman 
2586ab4382d2SGreg Kroah-Hartman struct tty_driver *uart_console_device(struct console *co, int *index)
2587ab4382d2SGreg Kroah-Hartman {
2588ab4382d2SGreg Kroah-Hartman 	struct uart_driver *p = co->data;
2589ab4382d2SGreg Kroah-Hartman 	*index = co->index;
2590ab4382d2SGreg Kroah-Hartman 	return p->tty_driver;
2591ab4382d2SGreg Kroah-Hartman }
2592ab4382d2SGreg Kroah-Hartman 
25936915c0e4STomas Hlavacek static ssize_t uart_get_attr_uartclk(struct device *dev,
25946915c0e4STomas Hlavacek 	struct device_attribute *attr, char *buf)
25956915c0e4STomas Hlavacek {
2596bebe73e3SAlan Cox 	struct serial_struct tmp;
25976915c0e4STomas Hlavacek 	struct tty_port *port = dev_get_drvdata(dev);
2598b1b79916STomas Hlavacek 
25999f109694SAlan Cox 	uart_get_info(port, &tmp);
2600bebe73e3SAlan Cox 	return snprintf(buf, PAGE_SIZE, "%d\n", tmp.baud_base * 16);
26016915c0e4STomas Hlavacek }
26026915c0e4STomas Hlavacek 
2603373bac4cSAlan Cox static ssize_t uart_get_attr_type(struct device *dev,
2604373bac4cSAlan Cox 	struct device_attribute *attr, char *buf)
2605373bac4cSAlan Cox {
2606373bac4cSAlan Cox 	struct serial_struct tmp;
2607373bac4cSAlan Cox 	struct tty_port *port = dev_get_drvdata(dev);
2608373bac4cSAlan Cox 
2609373bac4cSAlan Cox 	uart_get_info(port, &tmp);
2610373bac4cSAlan Cox 	return snprintf(buf, PAGE_SIZE, "%d\n", tmp.type);
2611373bac4cSAlan Cox }
2612373bac4cSAlan Cox static ssize_t uart_get_attr_line(struct device *dev,
2613373bac4cSAlan Cox 	struct device_attribute *attr, char *buf)
2614373bac4cSAlan Cox {
2615373bac4cSAlan Cox 	struct serial_struct tmp;
2616373bac4cSAlan Cox 	struct tty_port *port = dev_get_drvdata(dev);
2617373bac4cSAlan Cox 
2618373bac4cSAlan Cox 	uart_get_info(port, &tmp);
2619373bac4cSAlan Cox 	return snprintf(buf, PAGE_SIZE, "%d\n", tmp.line);
2620373bac4cSAlan Cox }
2621373bac4cSAlan Cox 
2622373bac4cSAlan Cox static ssize_t uart_get_attr_port(struct device *dev,
2623373bac4cSAlan Cox 	struct device_attribute *attr, char *buf)
2624373bac4cSAlan Cox {
2625373bac4cSAlan Cox 	struct serial_struct tmp;
2626373bac4cSAlan Cox 	struct tty_port *port = dev_get_drvdata(dev);
2627fd985e1dSAndrew Morton 	unsigned long ioaddr;
2628373bac4cSAlan Cox 
2629373bac4cSAlan Cox 	uart_get_info(port, &tmp);
2630fd985e1dSAndrew Morton 	ioaddr = tmp.port;
2631fd985e1dSAndrew Morton 	if (HIGH_BITS_OFFSET)
2632fd985e1dSAndrew Morton 		ioaddr |= (unsigned long)tmp.port_high << HIGH_BITS_OFFSET;
2633fd985e1dSAndrew Morton 	return snprintf(buf, PAGE_SIZE, "0x%lX\n", ioaddr);
2634373bac4cSAlan Cox }
2635373bac4cSAlan Cox 
2636373bac4cSAlan Cox static ssize_t uart_get_attr_irq(struct device *dev,
2637373bac4cSAlan Cox 	struct device_attribute *attr, char *buf)
2638373bac4cSAlan Cox {
2639373bac4cSAlan Cox 	struct serial_struct tmp;
2640373bac4cSAlan Cox 	struct tty_port *port = dev_get_drvdata(dev);
2641373bac4cSAlan Cox 
2642373bac4cSAlan Cox 	uart_get_info(port, &tmp);
2643373bac4cSAlan Cox 	return snprintf(buf, PAGE_SIZE, "%d\n", tmp.irq);
2644373bac4cSAlan Cox }
2645373bac4cSAlan Cox 
2646373bac4cSAlan Cox static ssize_t uart_get_attr_flags(struct device *dev,
2647373bac4cSAlan Cox 	struct device_attribute *attr, char *buf)
2648373bac4cSAlan Cox {
2649373bac4cSAlan Cox 	struct serial_struct tmp;
2650373bac4cSAlan Cox 	struct tty_port *port = dev_get_drvdata(dev);
2651373bac4cSAlan Cox 
2652373bac4cSAlan Cox 	uart_get_info(port, &tmp);
2653373bac4cSAlan Cox 	return snprintf(buf, PAGE_SIZE, "0x%X\n", tmp.flags);
2654373bac4cSAlan Cox }
2655373bac4cSAlan Cox 
2656373bac4cSAlan Cox static ssize_t uart_get_attr_xmit_fifo_size(struct device *dev,
2657373bac4cSAlan Cox 	struct device_attribute *attr, char *buf)
2658373bac4cSAlan Cox {
2659373bac4cSAlan Cox 	struct serial_struct tmp;
2660373bac4cSAlan Cox 	struct tty_port *port = dev_get_drvdata(dev);
2661373bac4cSAlan Cox 
2662373bac4cSAlan Cox 	uart_get_info(port, &tmp);
2663373bac4cSAlan Cox 	return snprintf(buf, PAGE_SIZE, "%d\n", tmp.xmit_fifo_size);
2664373bac4cSAlan Cox }
2665373bac4cSAlan Cox 
2666373bac4cSAlan Cox 
2667373bac4cSAlan Cox static ssize_t uart_get_attr_close_delay(struct device *dev,
2668373bac4cSAlan Cox 	struct device_attribute *attr, char *buf)
2669373bac4cSAlan Cox {
2670373bac4cSAlan Cox 	struct serial_struct tmp;
2671373bac4cSAlan Cox 	struct tty_port *port = dev_get_drvdata(dev);
2672373bac4cSAlan Cox 
2673373bac4cSAlan Cox 	uart_get_info(port, &tmp);
2674373bac4cSAlan Cox 	return snprintf(buf, PAGE_SIZE, "%d\n", tmp.close_delay);
2675373bac4cSAlan Cox }
2676373bac4cSAlan Cox 
2677373bac4cSAlan Cox 
2678373bac4cSAlan Cox static ssize_t uart_get_attr_closing_wait(struct device *dev,
2679373bac4cSAlan Cox 	struct device_attribute *attr, char *buf)
2680373bac4cSAlan Cox {
2681373bac4cSAlan Cox 	struct serial_struct tmp;
2682373bac4cSAlan Cox 	struct tty_port *port = dev_get_drvdata(dev);
2683373bac4cSAlan Cox 
2684373bac4cSAlan Cox 	uart_get_info(port, &tmp);
2685373bac4cSAlan Cox 	return snprintf(buf, PAGE_SIZE, "%d\n", tmp.closing_wait);
2686373bac4cSAlan Cox }
2687373bac4cSAlan Cox 
2688373bac4cSAlan Cox static ssize_t uart_get_attr_custom_divisor(struct device *dev,
2689373bac4cSAlan Cox 	struct device_attribute *attr, char *buf)
2690373bac4cSAlan Cox {
2691373bac4cSAlan Cox 	struct serial_struct tmp;
2692373bac4cSAlan Cox 	struct tty_port *port = dev_get_drvdata(dev);
2693373bac4cSAlan Cox 
2694373bac4cSAlan Cox 	uart_get_info(port, &tmp);
2695373bac4cSAlan Cox 	return snprintf(buf, PAGE_SIZE, "%d\n", tmp.custom_divisor);
2696373bac4cSAlan Cox }
2697373bac4cSAlan Cox 
2698373bac4cSAlan Cox static ssize_t uart_get_attr_io_type(struct device *dev,
2699373bac4cSAlan Cox 	struct device_attribute *attr, char *buf)
2700373bac4cSAlan Cox {
2701373bac4cSAlan Cox 	struct serial_struct tmp;
2702373bac4cSAlan Cox 	struct tty_port *port = dev_get_drvdata(dev);
2703373bac4cSAlan Cox 
2704373bac4cSAlan Cox 	uart_get_info(port, &tmp);
2705373bac4cSAlan Cox 	return snprintf(buf, PAGE_SIZE, "%d\n", tmp.io_type);
2706373bac4cSAlan Cox }
2707373bac4cSAlan Cox 
2708373bac4cSAlan Cox static ssize_t uart_get_attr_iomem_base(struct device *dev,
2709373bac4cSAlan Cox 	struct device_attribute *attr, char *buf)
2710373bac4cSAlan Cox {
2711373bac4cSAlan Cox 	struct serial_struct tmp;
2712373bac4cSAlan Cox 	struct tty_port *port = dev_get_drvdata(dev);
2713373bac4cSAlan Cox 
2714373bac4cSAlan Cox 	uart_get_info(port, &tmp);
2715373bac4cSAlan Cox 	return snprintf(buf, PAGE_SIZE, "0x%lX\n", (unsigned long)tmp.iomem_base);
2716373bac4cSAlan Cox }
2717373bac4cSAlan Cox 
2718373bac4cSAlan Cox static ssize_t uart_get_attr_iomem_reg_shift(struct device *dev,
2719373bac4cSAlan Cox 	struct device_attribute *attr, char *buf)
2720373bac4cSAlan Cox {
2721373bac4cSAlan Cox 	struct serial_struct tmp;
2722373bac4cSAlan Cox 	struct tty_port *port = dev_get_drvdata(dev);
2723373bac4cSAlan Cox 
2724373bac4cSAlan Cox 	uart_get_info(port, &tmp);
2725373bac4cSAlan Cox 	return snprintf(buf, PAGE_SIZE, "%d\n", tmp.iomem_reg_shift);
2726373bac4cSAlan Cox }
2727373bac4cSAlan Cox 
2728373bac4cSAlan Cox static DEVICE_ATTR(type, S_IRUSR | S_IRGRP, uart_get_attr_type, NULL);
2729373bac4cSAlan Cox static DEVICE_ATTR(line, S_IRUSR | S_IRGRP, uart_get_attr_line, NULL);
2730373bac4cSAlan Cox static DEVICE_ATTR(port, S_IRUSR | S_IRGRP, uart_get_attr_port, NULL);
2731373bac4cSAlan Cox static DEVICE_ATTR(irq, S_IRUSR | S_IRGRP, uart_get_attr_irq, NULL);
2732373bac4cSAlan Cox static DEVICE_ATTR(flags, S_IRUSR | S_IRGRP, uart_get_attr_flags, NULL);
2733373bac4cSAlan Cox static DEVICE_ATTR(xmit_fifo_size, S_IRUSR | S_IRGRP, uart_get_attr_xmit_fifo_size, NULL);
27346915c0e4STomas Hlavacek static DEVICE_ATTR(uartclk, S_IRUSR | S_IRGRP, uart_get_attr_uartclk, NULL);
2735373bac4cSAlan Cox static DEVICE_ATTR(close_delay, S_IRUSR | S_IRGRP, uart_get_attr_close_delay, NULL);
2736373bac4cSAlan Cox static DEVICE_ATTR(closing_wait, S_IRUSR | S_IRGRP, uart_get_attr_closing_wait, NULL);
2737373bac4cSAlan Cox static DEVICE_ATTR(custom_divisor, S_IRUSR | S_IRGRP, uart_get_attr_custom_divisor, NULL);
2738373bac4cSAlan Cox static DEVICE_ATTR(io_type, S_IRUSR | S_IRGRP, uart_get_attr_io_type, NULL);
2739373bac4cSAlan Cox static DEVICE_ATTR(iomem_base, S_IRUSR | S_IRGRP, uart_get_attr_iomem_base, NULL);
2740373bac4cSAlan Cox static DEVICE_ATTR(iomem_reg_shift, S_IRUSR | S_IRGRP, uart_get_attr_iomem_reg_shift, NULL);
27416915c0e4STomas Hlavacek 
27426915c0e4STomas Hlavacek static struct attribute *tty_dev_attrs[] = {
2743373bac4cSAlan Cox 	&dev_attr_type.attr,
2744373bac4cSAlan Cox 	&dev_attr_line.attr,
2745373bac4cSAlan Cox 	&dev_attr_port.attr,
2746373bac4cSAlan Cox 	&dev_attr_irq.attr,
2747373bac4cSAlan Cox 	&dev_attr_flags.attr,
2748373bac4cSAlan Cox 	&dev_attr_xmit_fifo_size.attr,
27496915c0e4STomas Hlavacek 	&dev_attr_uartclk.attr,
2750373bac4cSAlan Cox 	&dev_attr_close_delay.attr,
2751373bac4cSAlan Cox 	&dev_attr_closing_wait.attr,
2752373bac4cSAlan Cox 	&dev_attr_custom_divisor.attr,
2753373bac4cSAlan Cox 	&dev_attr_io_type.attr,
2754373bac4cSAlan Cox 	&dev_attr_iomem_base.attr,
2755373bac4cSAlan Cox 	&dev_attr_iomem_reg_shift.attr,
27566915c0e4STomas Hlavacek 	NULL,
27576915c0e4STomas Hlavacek 	};
27586915c0e4STomas Hlavacek 
2759b1b79916STomas Hlavacek static const struct attribute_group tty_dev_attr_group = {
27606915c0e4STomas Hlavacek 	.attrs = tty_dev_attrs,
27616915c0e4STomas Hlavacek 	};
27626915c0e4STomas Hlavacek 
2763ab4382d2SGreg Kroah-Hartman /**
2764ab4382d2SGreg Kroah-Hartman  *	uart_add_one_port - attach a driver-defined port structure
2765ab4382d2SGreg Kroah-Hartman  *	@drv: pointer to the uart low level driver structure for this port
2766ab4382d2SGreg Kroah-Hartman  *	@uport: uart port structure to use for this port.
2767ab4382d2SGreg Kroah-Hartman  *
2768ab4382d2SGreg Kroah-Hartman  *	This allows the driver to register its own uart_port structure
2769ab4382d2SGreg Kroah-Hartman  *	with the core driver.  The main purpose is to allow the low
2770ab4382d2SGreg Kroah-Hartman  *	level uart drivers to expand uart_port, rather than having yet
2771ab4382d2SGreg Kroah-Hartman  *	more levels of structures.
2772ab4382d2SGreg Kroah-Hartman  */
2773ab4382d2SGreg Kroah-Hartman int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport)
2774ab4382d2SGreg Kroah-Hartman {
2775ab4382d2SGreg Kroah-Hartman 	struct uart_state *state;
2776ab4382d2SGreg Kroah-Hartman 	struct tty_port *port;
2777ab4382d2SGreg Kroah-Hartman 	int ret = 0;
2778ab4382d2SGreg Kroah-Hartman 	struct device *tty_dev;
2779266dcff0SGreg Kroah-Hartman 	int num_groups;
2780ab4382d2SGreg Kroah-Hartman 
2781ab4382d2SGreg Kroah-Hartman 	BUG_ON(in_interrupt());
2782ab4382d2SGreg Kroah-Hartman 
2783ab4382d2SGreg Kroah-Hartman 	if (uport->line >= drv->nr)
2784ab4382d2SGreg Kroah-Hartman 		return -EINVAL;
2785ab4382d2SGreg Kroah-Hartman 
2786ab4382d2SGreg Kroah-Hartman 	state = drv->state + uport->line;
2787ab4382d2SGreg Kroah-Hartman 	port = &state->port;
2788ab4382d2SGreg Kroah-Hartman 
2789ab4382d2SGreg Kroah-Hartman 	mutex_lock(&port_mutex);
2790ab4382d2SGreg Kroah-Hartman 	mutex_lock(&port->mutex);
2791ab4382d2SGreg Kroah-Hartman 	if (state->uart_port) {
2792ab4382d2SGreg Kroah-Hartman 		ret = -EINVAL;
2793ab4382d2SGreg Kroah-Hartman 		goto out;
2794ab4382d2SGreg Kroah-Hartman 	}
2795ab4382d2SGreg Kroah-Hartman 
27962b702b9bSPeter Hurley 	/* Link the port to the driver state table and vice versa */
27979ed19428SPeter Hurley 	atomic_set(&state->refcount, 1);
27989ed19428SPeter Hurley 	init_waitqueue_head(&state->remove_wait);
2799ab4382d2SGreg Kroah-Hartman 	state->uart_port = uport;
2800ab4382d2SGreg Kroah-Hartman 	uport->state = state;
2801ab4382d2SGreg Kroah-Hartman 
28022b702b9bSPeter Hurley 	state->pm_state = UART_PM_STATE_UNDEFINED;
28032b702b9bSPeter Hurley 	uport->cons = drv->cons;
2804959801feSPeter Hurley 	uport->minor = drv->tty_driver->minor_start + uport->line;
2805f7048b15SVignesh R 	uport->name = kasprintf(GFP_KERNEL, "%s%d", drv->dev_name,
2806f7048b15SVignesh R 				drv->tty_driver->name_base + uport->line);
2807f7048b15SVignesh R 	if (!uport->name) {
2808f7048b15SVignesh R 		ret = -ENOMEM;
2809f7048b15SVignesh R 		goto out;
2810f7048b15SVignesh R 	}
28112b702b9bSPeter Hurley 
2812ab4382d2SGreg Kroah-Hartman 	/*
2813ab4382d2SGreg Kroah-Hartman 	 * If this port is a console, then the spinlock is already
2814ab4382d2SGreg Kroah-Hartman 	 * initialised.
2815ab4382d2SGreg Kroah-Hartman 	 */
2816ab4382d2SGreg Kroah-Hartman 	if (!(uart_console(uport) && (uport->cons->flags & CON_ENABLED))) {
2817ab4382d2SGreg Kroah-Hartman 		spin_lock_init(&uport->lock);
2818ab4382d2SGreg Kroah-Hartman 		lockdep_set_class(&uport->lock, &port_lock_key);
2819ab4382d2SGreg Kroah-Hartman 	}
2820a208ffd2SGrant Likely 	if (uport->cons && uport->dev)
2821a208ffd2SGrant Likely 		of_console_check(uport->dev->of_node, uport->cons->name, uport->line);
2822ab4382d2SGreg Kroah-Hartman 
2823ab4382d2SGreg Kroah-Hartman 	uart_configure_port(drv, state, uport);
2824ab4382d2SGreg Kroah-Hartman 
28254dda864dSGeert Uytterhoeven 	port->console = uart_console(uport);
28264dda864dSGeert Uytterhoeven 
2827266dcff0SGreg Kroah-Hartman 	num_groups = 2;
2828266dcff0SGreg Kroah-Hartman 	if (uport->attr_group)
2829266dcff0SGreg Kroah-Hartman 		num_groups++;
2830266dcff0SGreg Kroah-Hartman 
2831c2b703b8SYoshihiro YUNOMAE 	uport->tty_groups = kcalloc(num_groups, sizeof(*uport->tty_groups),
2832266dcff0SGreg Kroah-Hartman 				    GFP_KERNEL);
2833266dcff0SGreg Kroah-Hartman 	if (!uport->tty_groups) {
2834266dcff0SGreg Kroah-Hartman 		ret = -ENOMEM;
2835266dcff0SGreg Kroah-Hartman 		goto out;
2836266dcff0SGreg Kroah-Hartman 	}
2837266dcff0SGreg Kroah-Hartman 	uport->tty_groups[0] = &tty_dev_attr_group;
2838266dcff0SGreg Kroah-Hartman 	if (uport->attr_group)
2839266dcff0SGreg Kroah-Hartman 		uport->tty_groups[1] = uport->attr_group;
2840266dcff0SGreg Kroah-Hartman 
2841ab4382d2SGreg Kroah-Hartman 	/*
2842ab4382d2SGreg Kroah-Hartman 	 * Register the port whether it's detected or not.  This allows
2843015355b7SGeert Uytterhoeven 	 * setserial to be used to alter this port's parameters.
2844ab4382d2SGreg Kroah-Hartman 	 */
2845da4c2799SJohan Hovold 	tty_dev = tty_port_register_device_attr_serdev(port, drv->tty_driver,
2846266dcff0SGreg Kroah-Hartman 			uport->line, uport->dev, port, uport->tty_groups);
2847b289c496SChengguang Xu 	if (!IS_ERR(tty_dev)) {
284877359835SSimon Glass 		device_set_wakeup_capable(tty_dev, 1);
284977359835SSimon Glass 	} else {
28502f2dafe7SSudip Mukherjee 		dev_err(uport->dev, "Cannot register tty device on line %d\n",
2851ab4382d2SGreg Kroah-Hartman 		       uport->line);
285277359835SSimon Glass 	}
2853ab4382d2SGreg Kroah-Hartman 
2854ab4382d2SGreg Kroah-Hartman 	/*
2855ab4382d2SGreg Kroah-Hartman 	 * Ensure UPF_DEAD is not set.
2856ab4382d2SGreg Kroah-Hartman 	 */
2857ab4382d2SGreg Kroah-Hartman 	uport->flags &= ~UPF_DEAD;
2858ab4382d2SGreg Kroah-Hartman 
2859ab4382d2SGreg Kroah-Hartman  out:
2860ab4382d2SGreg Kroah-Hartman 	mutex_unlock(&port->mutex);
2861ab4382d2SGreg Kroah-Hartman 	mutex_unlock(&port_mutex);
2862ab4382d2SGreg Kroah-Hartman 
2863ab4382d2SGreg Kroah-Hartman 	return ret;
2864ab4382d2SGreg Kroah-Hartman }
2865ab4382d2SGreg Kroah-Hartman 
2866ab4382d2SGreg Kroah-Hartman /**
2867ab4382d2SGreg Kroah-Hartman  *	uart_remove_one_port - detach a driver defined port structure
2868ab4382d2SGreg Kroah-Hartman  *	@drv: pointer to the uart low level driver structure for this port
2869ab4382d2SGreg Kroah-Hartman  *	@uport: uart port structure for this port
2870ab4382d2SGreg Kroah-Hartman  *
2871ab4382d2SGreg Kroah-Hartman  *	This unhooks (and hangs up) the specified port structure from the
2872ab4382d2SGreg Kroah-Hartman  *	core driver.  No further calls will be made to the low-level code
2873ab4382d2SGreg Kroah-Hartman  *	for this port.
2874ab4382d2SGreg Kroah-Hartman  */
2875ab4382d2SGreg Kroah-Hartman int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport)
2876ab4382d2SGreg Kroah-Hartman {
2877ab4382d2SGreg Kroah-Hartman 	struct uart_state *state = drv->state + uport->line;
2878ab4382d2SGreg Kroah-Hartman 	struct tty_port *port = &state->port;
28794047b371SPeter Hurley 	struct uart_port *uart_port;
28804c6d5b4dSGeert Uytterhoeven 	struct tty_struct *tty;
2881b342dd51SChen Gang 	int ret = 0;
2882ab4382d2SGreg Kroah-Hartman 
2883ab4382d2SGreg Kroah-Hartman 	BUG_ON(in_interrupt());
2884ab4382d2SGreg Kroah-Hartman 
2885ab4382d2SGreg Kroah-Hartman 	mutex_lock(&port_mutex);
2886ab4382d2SGreg Kroah-Hartman 
2887ab4382d2SGreg Kroah-Hartman 	/*
2888ab4382d2SGreg Kroah-Hartman 	 * Mark the port "dead" - this prevents any opens from
2889ab4382d2SGreg Kroah-Hartman 	 * succeeding while we shut down the port.
2890ab4382d2SGreg Kroah-Hartman 	 */
2891ab4382d2SGreg Kroah-Hartman 	mutex_lock(&port->mutex);
28924047b371SPeter Hurley 	uart_port = uart_port_check(state);
28934047b371SPeter Hurley 	if (uart_port != uport)
28944047b371SPeter Hurley 		dev_alert(uport->dev, "Removing wrong port: %p != %p\n",
28954047b371SPeter Hurley 			  uart_port, uport);
28964047b371SPeter Hurley 
28974047b371SPeter Hurley 	if (!uart_port) {
2898b342dd51SChen Gang 		mutex_unlock(&port->mutex);
2899b342dd51SChen Gang 		ret = -EINVAL;
2900b342dd51SChen Gang 		goto out;
2901b342dd51SChen Gang 	}
2902ab4382d2SGreg Kroah-Hartman 	uport->flags |= UPF_DEAD;
2903ab4382d2SGreg Kroah-Hartman 	mutex_unlock(&port->mutex);
2904ab4382d2SGreg Kroah-Hartman 
2905ab4382d2SGreg Kroah-Hartman 	/*
2906ab4382d2SGreg Kroah-Hartman 	 * Remove the devices from the tty layer
2907ab4382d2SGreg Kroah-Hartman 	 */
2908da4c2799SJohan Hovold 	tty_port_unregister_device(port, drv->tty_driver, uport->line);
2909ab4382d2SGreg Kroah-Hartman 
29104c6d5b4dSGeert Uytterhoeven 	tty = tty_port_tty_get(port);
29114c6d5b4dSGeert Uytterhoeven 	if (tty) {
2912ab4382d2SGreg Kroah-Hartman 		tty_vhangup(port->tty);
29134c6d5b4dSGeert Uytterhoeven 		tty_kref_put(tty);
29144c6d5b4dSGeert Uytterhoeven 	}
2915ab4382d2SGreg Kroah-Hartman 
2916ab4382d2SGreg Kroah-Hartman 	/*
29175f5c9ae5SGeert Uytterhoeven 	 * If the port is used as a console, unregister it
29185f5c9ae5SGeert Uytterhoeven 	 */
29195f5c9ae5SGeert Uytterhoeven 	if (uart_console(uport))
29205f5c9ae5SGeert Uytterhoeven 		unregister_console(uport->cons);
29215f5c9ae5SGeert Uytterhoeven 
29225f5c9ae5SGeert Uytterhoeven 	/*
2923ab4382d2SGreg Kroah-Hartman 	 * Free the port IO and memory resources, if any.
2924ab4382d2SGreg Kroah-Hartman 	 */
2925a7cfaf16SFabio Estevam 	if (uport->type != PORT_UNKNOWN && uport->ops->release_port)
2926ab4382d2SGreg Kroah-Hartman 		uport->ops->release_port(uport);
2927266dcff0SGreg Kroah-Hartman 	kfree(uport->tty_groups);
2928f7048b15SVignesh R 	kfree(uport->name);
2929ab4382d2SGreg Kroah-Hartman 
2930ab4382d2SGreg Kroah-Hartman 	/*
2931ab4382d2SGreg Kroah-Hartman 	 * Indicate that there isn't a port here anymore.
2932ab4382d2SGreg Kroah-Hartman 	 */
2933ab4382d2SGreg Kroah-Hartman 	uport->type = PORT_UNKNOWN;
2934ab4382d2SGreg Kroah-Hartman 
29354047b371SPeter Hurley 	mutex_lock(&port->mutex);
29369ed19428SPeter Hurley 	WARN_ON(atomic_dec_return(&state->refcount) < 0);
29379ed19428SPeter Hurley 	wait_event(state->remove_wait, !atomic_read(&state->refcount));
2938ab4382d2SGreg Kroah-Hartman 	state->uart_port = NULL;
29394047b371SPeter Hurley 	mutex_unlock(&port->mutex);
2940b342dd51SChen Gang out:
2941ab4382d2SGreg Kroah-Hartman 	mutex_unlock(&port_mutex);
2942ab4382d2SGreg Kroah-Hartman 
2943b342dd51SChen Gang 	return ret;
2944ab4382d2SGreg Kroah-Hartman }
2945ab4382d2SGreg Kroah-Hartman 
2946ab4382d2SGreg Kroah-Hartman /*
2947ab4382d2SGreg Kroah-Hartman  *	Are the two ports equivalent?
2948ab4382d2SGreg Kroah-Hartman  */
2949ab4382d2SGreg Kroah-Hartman int uart_match_port(struct uart_port *port1, struct uart_port *port2)
2950ab4382d2SGreg Kroah-Hartman {
2951ab4382d2SGreg Kroah-Hartman 	if (port1->iotype != port2->iotype)
2952ab4382d2SGreg Kroah-Hartman 		return 0;
2953ab4382d2SGreg Kroah-Hartman 
2954ab4382d2SGreg Kroah-Hartman 	switch (port1->iotype) {
2955ab4382d2SGreg Kroah-Hartman 	case UPIO_PORT:
2956ab4382d2SGreg Kroah-Hartman 		return (port1->iobase == port2->iobase);
2957ab4382d2SGreg Kroah-Hartman 	case UPIO_HUB6:
2958ab4382d2SGreg Kroah-Hartman 		return (port1->iobase == port2->iobase) &&
2959ab4382d2SGreg Kroah-Hartman 		       (port1->hub6   == port2->hub6);
2960ab4382d2SGreg Kroah-Hartman 	case UPIO_MEM:
2961bd94c407SMasahiro Yamada 	case UPIO_MEM16:
2962ab4382d2SGreg Kroah-Hartman 	case UPIO_MEM32:
29633ffb1a81SKevin Cernekee 	case UPIO_MEM32BE:
2964ab4382d2SGreg Kroah-Hartman 	case UPIO_AU:
2965ab4382d2SGreg Kroah-Hartman 	case UPIO_TSI:
2966ab4382d2SGreg Kroah-Hartman 		return (port1->mapbase == port2->mapbase);
2967ab4382d2SGreg Kroah-Hartman 	}
2968ab4382d2SGreg Kroah-Hartman 	return 0;
2969ab4382d2SGreg Kroah-Hartman }
2970ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_match_port);
2971ab4382d2SGreg Kroah-Hartman 
2972027d7dacSJiri Slaby /**
2973027d7dacSJiri Slaby  *	uart_handle_dcd_change - handle a change of carrier detect state
2974027d7dacSJiri Slaby  *	@uport: uart_port structure for the open port
2975027d7dacSJiri Slaby  *	@status: new carrier detect status, nonzero if active
29764d90bb14SPeter Hurley  *
29774d90bb14SPeter Hurley  *	Caller must hold uport->lock
2978027d7dacSJiri Slaby  */
2979027d7dacSJiri Slaby void uart_handle_dcd_change(struct uart_port *uport, unsigned int status)
2980027d7dacSJiri Slaby {
298142381572SGeorge Spelvin 	struct tty_port *port = &uport->state->port;
298243eca0aeSAlan Cox 	struct tty_struct *tty = port->tty;
2983c993257bSPeter Hurley 	struct tty_ldisc *ld;
2984027d7dacSJiri Slaby 
29854d90bb14SPeter Hurley 	lockdep_assert_held_once(&uport->lock);
29864d90bb14SPeter Hurley 
2987c993257bSPeter Hurley 	if (tty) {
2988c993257bSPeter Hurley 		ld = tty_ldisc_ref(tty);
298942381572SGeorge Spelvin 		if (ld) {
299042381572SGeorge Spelvin 			if (ld->ops->dcd_change)
2991593fb1aeSGeorge Spelvin 				ld->ops->dcd_change(tty, status);
299242381572SGeorge Spelvin 			tty_ldisc_deref(ld);
299342381572SGeorge Spelvin 		}
2994c993257bSPeter Hurley 	}
2995027d7dacSJiri Slaby 
2996027d7dacSJiri Slaby 	uport->icount.dcd++;
2997027d7dacSJiri Slaby 
2998299245a1SPeter Hurley 	if (uart_dcd_enabled(uport)) {
2999027d7dacSJiri Slaby 		if (status)
3000027d7dacSJiri Slaby 			wake_up_interruptible(&port->open_wait);
300143eca0aeSAlan Cox 		else if (tty)
300243eca0aeSAlan Cox 			tty_hangup(tty);
3003027d7dacSJiri Slaby 	}
3004027d7dacSJiri Slaby }
3005027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_handle_dcd_change);
3006027d7dacSJiri Slaby 
3007027d7dacSJiri Slaby /**
3008027d7dacSJiri Slaby  *	uart_handle_cts_change - handle a change of clear-to-send state
3009027d7dacSJiri Slaby  *	@uport: uart_port structure for the open port
3010027d7dacSJiri Slaby  *	@status: new clear to send status, nonzero if active
30114d90bb14SPeter Hurley  *
30124d90bb14SPeter Hurley  *	Caller must hold uport->lock
3013027d7dacSJiri Slaby  */
3014027d7dacSJiri Slaby void uart_handle_cts_change(struct uart_port *uport, unsigned int status)
3015027d7dacSJiri Slaby {
30164d90bb14SPeter Hurley 	lockdep_assert_held_once(&uport->lock);
30174d90bb14SPeter Hurley 
3018027d7dacSJiri Slaby 	uport->icount.cts++;
3019027d7dacSJiri Slaby 
3020391f93f2SPeter Hurley 	if (uart_softcts_mode(uport)) {
3021d01f4d18SPeter Hurley 		if (uport->hw_stopped) {
3022027d7dacSJiri Slaby 			if (status) {
3023d01f4d18SPeter Hurley 				uport->hw_stopped = 0;
3024027d7dacSJiri Slaby 				uport->ops->start_tx(uport);
3025027d7dacSJiri Slaby 				uart_write_wakeup(uport);
3026027d7dacSJiri Slaby 			}
3027027d7dacSJiri Slaby 		} else {
3028027d7dacSJiri Slaby 			if (!status) {
3029d01f4d18SPeter Hurley 				uport->hw_stopped = 1;
3030027d7dacSJiri Slaby 				uport->ops->stop_tx(uport);
3031027d7dacSJiri Slaby 			}
3032027d7dacSJiri Slaby 		}
3033391f93f2SPeter Hurley 
3034027d7dacSJiri Slaby 	}
3035027d7dacSJiri Slaby }
3036027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_handle_cts_change);
3037027d7dacSJiri Slaby 
3038cf75525fSJiri Slaby /**
3039cf75525fSJiri Slaby  * uart_insert_char - push a char to the uart layer
3040cf75525fSJiri Slaby  *
3041cf75525fSJiri Slaby  * User is responsible to call tty_flip_buffer_push when they are done with
3042cf75525fSJiri Slaby  * insertion.
3043cf75525fSJiri Slaby  *
3044cf75525fSJiri Slaby  * @port: corresponding port
3045cf75525fSJiri Slaby  * @status: state of the serial port RX buffer (LSR for 8250)
3046cf75525fSJiri Slaby  * @overrun: mask of overrun bits in @status
3047cf75525fSJiri Slaby  * @ch: character to push
3048cf75525fSJiri Slaby  * @flag: flag for the character (see TTY_NORMAL and friends)
3049cf75525fSJiri Slaby  */
3050027d7dacSJiri Slaby void uart_insert_char(struct uart_port *port, unsigned int status,
3051027d7dacSJiri Slaby 		 unsigned int overrun, unsigned int ch, unsigned int flag)
3052027d7dacSJiri Slaby {
305392a19f9cSJiri Slaby 	struct tty_port *tport = &port->state->port;
3054027d7dacSJiri Slaby 
3055027d7dacSJiri Slaby 	if ((status & port->ignore_status_mask & ~overrun) == 0)
305692a19f9cSJiri Slaby 		if (tty_insert_flip_char(tport, ch, flag) == 0)
3057dabfb351SCorbin 			++port->icount.buf_overrun;
3058027d7dacSJiri Slaby 
3059027d7dacSJiri Slaby 	/*
3060027d7dacSJiri Slaby 	 * Overrun is special.  Since it's reported immediately,
3061027d7dacSJiri Slaby 	 * it doesn't affect the current character.
3062027d7dacSJiri Slaby 	 */
3063027d7dacSJiri Slaby 	if (status & ~port->ignore_status_mask & overrun)
306492a19f9cSJiri Slaby 		if (tty_insert_flip_char(tport, 0, TTY_OVERRUN) == 0)
3065dabfb351SCorbin 			++port->icount.buf_overrun;
3066027d7dacSJiri Slaby }
3067027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_insert_char);
3068027d7dacSJiri Slaby 
3069ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_write_wakeup);
3070ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_register_driver);
3071ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_unregister_driver);
3072ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_suspend_port);
3073ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_resume_port);
3074ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_add_one_port);
3075ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_remove_one_port);
3076ab4382d2SGreg Kroah-Hartman 
3077ef838a81SUwe Kleine-König /**
3078743f93f8SLukas Wunner  * uart_get_rs485_mode() - retrieve rs485 properties for given uart
3079743f93f8SLukas Wunner  * @dev: uart device
3080ef838a81SUwe Kleine-König  * @rs485conf: output parameter
3081ef838a81SUwe Kleine-König  *
3082ef838a81SUwe Kleine-König  * This function implements the device tree binding described in
3083ef838a81SUwe Kleine-König  * Documentation/devicetree/bindings/serial/rs485.txt.
3084ef838a81SUwe Kleine-König  */
3085743f93f8SLukas Wunner void uart_get_rs485_mode(struct device *dev, struct serial_rs485 *rs485conf)
3086ef838a81SUwe Kleine-König {
3087ef838a81SUwe Kleine-König 	u32 rs485_delay[2];
3088ef838a81SUwe Kleine-König 	int ret;
3089ef838a81SUwe Kleine-König 
3090743f93f8SLukas Wunner 	ret = device_property_read_u32_array(dev, "rs485-rts-delay",
3091743f93f8SLukas Wunner 					     rs485_delay, 2);
3092ef838a81SUwe Kleine-König 	if (!ret) {
3093ef838a81SUwe Kleine-König 		rs485conf->delay_rts_before_send = rs485_delay[0];
3094ef838a81SUwe Kleine-König 		rs485conf->delay_rts_after_send = rs485_delay[1];
3095ef838a81SUwe Kleine-König 	} else {
3096ef838a81SUwe Kleine-König 		rs485conf->delay_rts_before_send = 0;
3097ef838a81SUwe Kleine-König 		rs485conf->delay_rts_after_send = 0;
3098ef838a81SUwe Kleine-König 	}
3099ef838a81SUwe Kleine-König 
3100ef838a81SUwe Kleine-König 	/*
3101f1e5b618SLukas Wunner 	 * Clear full-duplex and enabled flags, set RTS polarity to active high
3102f1e5b618SLukas Wunner 	 * to get to a defined state with the following properties:
3103ef838a81SUwe Kleine-König 	 */
3104f1e5b618SLukas Wunner 	rs485conf->flags &= ~(SER_RS485_RX_DURING_TX | SER_RS485_ENABLED |
3105f1e5b618SLukas Wunner 			      SER_RS485_RTS_AFTER_SEND);
3106f1e5b618SLukas Wunner 	rs485conf->flags |= SER_RS485_RTS_ON_SEND;
3107ef838a81SUwe Kleine-König 
3108743f93f8SLukas Wunner 	if (device_property_read_bool(dev, "rs485-rx-during-tx"))
3109ef838a81SUwe Kleine-König 		rs485conf->flags |= SER_RS485_RX_DURING_TX;
3110ef838a81SUwe Kleine-König 
3111743f93f8SLukas Wunner 	if (device_property_read_bool(dev, "linux,rs485-enabled-at-boot-time"))
3112ef838a81SUwe Kleine-König 		rs485conf->flags |= SER_RS485_ENABLED;
3113f1e5b618SLukas Wunner 
3114f1e5b618SLukas Wunner 	if (device_property_read_bool(dev, "rs485-rts-active-low")) {
3115f1e5b618SLukas Wunner 		rs485conf->flags &= ~SER_RS485_RTS_ON_SEND;
3116f1e5b618SLukas Wunner 		rs485conf->flags |= SER_RS485_RTS_AFTER_SEND;
3117f1e5b618SLukas Wunner 	}
3118ef838a81SUwe Kleine-König }
3119743f93f8SLukas Wunner EXPORT_SYMBOL_GPL(uart_get_rs485_mode);
3120ef838a81SUwe Kleine-König 
3121ab4382d2SGreg Kroah-Hartman MODULE_DESCRIPTION("Serial driver core");
3122ab4382d2SGreg Kroah-Hartman MODULE_LICENSE("GPL");
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