// SPDX-License-Identifier: GPL-2.0 /* * su.c: Small serial driver for keyboard/mouse interface on sparc32/PCI * * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be) * Copyright (C) 1998-1999 Pete Zaitcev (zaitcev@yahoo.com) * * This is mainly a variation of 8250.c, credits go to authors mentioned * therein. In fact this driver should be merged into the generic 8250.c * infrastructure perhaps using a 8250_sparc.c module. * * Fixed to use tty_get_baud_rate(). * Theodore Ts'o , 2001-Oct-12 * * Converted to new 2.5.x UART layer. * David S. Miller (davem@davemloft.net), 2002-Jul-29 */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef CONFIG_SERIO #include #endif #include #include #include #include #include #include #include #include #include #include /* We are on a NS PC87303 clocked with 24.0 MHz, which results * in a UART clock of 1.8462 MHz. */ #define SU_BASE_BAUD (1846200 / 16) enum su_type { SU_PORT_NONE, SU_PORT_MS, SU_PORT_KBD, SU_PORT_PORT }; static char *su_typev[] = { "su(???)", "su(mouse)", "su(kbd)", "su(serial)" }; struct serial_uart_config { char *name; int dfl_xmit_fifo_size; int flags; }; /* * Here we define the default xmit fifo size used for each type of UART. */ static const struct serial_uart_config uart_config[] = { { "unknown", 1, 0 }, { "8250", 1, 0 }, { "16450", 1, 0 }, { "16550", 1, 0 }, { "16550A", 16, UART_CLEAR_FIFO | UART_USE_FIFO }, { "Cirrus", 1, 0 }, { "ST16650", 1, UART_CLEAR_FIFO | UART_STARTECH }, { "ST16650V2", 32, UART_CLEAR_FIFO | UART_USE_FIFO | UART_STARTECH }, { "TI16750", 64, UART_CLEAR_FIFO | UART_USE_FIFO }, { "Startech", 1, 0 }, { "16C950/954", 128, UART_CLEAR_FIFO | UART_USE_FIFO }, { "ST16654", 64, UART_CLEAR_FIFO | UART_USE_FIFO | UART_STARTECH }, { "XR16850", 128, UART_CLEAR_FIFO | UART_USE_FIFO | UART_STARTECH }, { "RSA", 2048, UART_CLEAR_FIFO | UART_USE_FIFO } }; struct uart_sunsu_port { struct uart_port port; unsigned char acr; unsigned char ier; unsigned short rev; unsigned char lcr; unsigned int lsr_break_flag; unsigned int cflag; /* Probing information. */ enum su_type su_type; unsigned int type_probed; /* XXX Stupid */ unsigned long reg_size; #ifdef CONFIG_SERIO struct serio serio; int serio_open; #endif }; static unsigned int serial_in(struct uart_sunsu_port *up, int offset) { offset <<= up->port.regshift; switch (up->port.iotype) { case UPIO_HUB6: outb(up->port.hub6 - 1 + offset, up->port.iobase); return inb(up->port.iobase + 1); case UPIO_MEM: return readb(up->port.membase + offset); default: return inb(up->port.iobase + offset); } } static void serial_out(struct uart_sunsu_port *up, int offset, int value) { #ifndef CONFIG_SPARC64 /* * MrCoffee has weird schematics: IRQ4 & P10(?) pins of SuperIO are * connected with a gate then go to SlavIO. When IRQ4 goes tristated * gate outputs a logical one. Since we use level triggered interrupts * we have lockup and watchdog reset. We cannot mask IRQ because * keyboard shares IRQ with us (Word has it as Bob Smelik's design). * This problem is similar to what Alpha people suffer, see * 8250_alpha.c. */ if (offset == UART_MCR) value |= UART_MCR_OUT2; #endif offset <<= up->port.regshift; switch (up->port.iotype) { case UPIO_HUB6: outb(up->port.hub6 - 1 + offset, up->port.iobase); outb(value, up->port.iobase + 1); break; case UPIO_MEM: writeb(value, up->port.membase + offset); break; default: outb(value, up->port.iobase + offset); } } /* * We used to support using pause I/O for certain machines. We * haven't supported this for a while, but just in case it's badly * needed for certain old 386 machines, I've left these #define's * in.... */ #define serial_inp(up, offset) serial_in(up, offset) #define serial_outp(up, offset, value) serial_out(up, offset, value) /* * For the 16C950 */ static void serial_icr_write(struct uart_sunsu_port *up, int offset, int value) { serial_out(up, UART_SCR, offset); serial_out(up, UART_ICR, value); } #if 0 /* Unused currently */ static unsigned int serial_icr_read(struct uart_sunsu_port *up, int offset) { unsigned int value; serial_icr_write(up, UART_ACR, up->acr | UART_ACR_ICRRD); serial_out(up, UART_SCR, offset); value = serial_in(up, UART_ICR); serial_icr_write(up, UART_ACR, up->acr); return value; } #endif #ifdef CONFIG_SERIAL_8250_RSA /* * Attempts to turn on the RSA FIFO. Returns zero on failure. * We set the port uart clock rate if we succeed. */ static int __enable_rsa(struct uart_sunsu_port *up) { unsigned char mode; int result; mode = serial_inp(up, UART_RSA_MSR); result = mode & UART_RSA_MSR_FIFO; if (!result) { serial_outp(up, UART_RSA_MSR, mode | UART_RSA_MSR_FIFO); mode = serial_inp(up, UART_RSA_MSR); result = mode & UART_RSA_MSR_FIFO; } if (result) up->port.uartclk = SERIAL_RSA_BAUD_BASE * 16; return result; } static void enable_rsa(struct uart_sunsu_port *up) { if (up->port.type == PORT_RSA) { if (up->port.uartclk != SERIAL_RSA_BAUD_BASE * 16) { spin_lock_irq(&up->port.lock); __enable_rsa(up); spin_unlock_irq(&up->port.lock); } if (up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16) serial_outp(up, UART_RSA_FRR, 0); } } /* * Attempts to turn off the RSA FIFO. Returns zero on failure. * It is unknown why interrupts were disabled in here. However, * the caller is expected to preserve this behaviour by grabbing * the spinlock before calling this function. */ static void disable_rsa(struct uart_sunsu_port *up) { unsigned char mode; int result; if (up->port.type == PORT_RSA && up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16) { spin_lock_irq(&up->port.lock); mode = serial_inp(up, UART_RSA_MSR); result = !(mode & UART_RSA_MSR_FIFO); if (!result) { serial_outp(up, UART_RSA_MSR, mode & ~UART_RSA_MSR_FIFO); mode = serial_inp(up, UART_RSA_MSR); result = !(mode & UART_RSA_MSR_FIFO); } if (result) up->port.uartclk = SERIAL_RSA_BAUD_BASE_LO * 16; spin_unlock_irq(&up->port.lock); } } #endif /* CONFIG_SERIAL_8250_RSA */ static inline void __stop_tx(struct uart_sunsu_port *p) { if (p->ier & UART_IER_THRI) { p->ier &= ~UART_IER_THRI; serial_out(p, UART_IER, p->ier); } } static void sunsu_stop_tx(struct uart_port *port) { struct uart_sunsu_port *up = container_of(port, struct uart_sunsu_port, port); __stop_tx(up); /* * We really want to stop the transmitter from sending. */ if (up->port.type == PORT_16C950) { up->acr |= UART_ACR_TXDIS; serial_icr_write(up, UART_ACR, up->acr); } } static void sunsu_start_tx(struct uart_port *port) { struct uart_sunsu_port *up = container_of(port, struct uart_sunsu_port, port); if (!(up->ier & UART_IER_THRI)) { up->ier |= UART_IER_THRI; serial_out(up, UART_IER, up->ier); } /* * Re-enable the transmitter if we disabled it. */ if (up->port.type == PORT_16C950 && up->acr & UART_ACR_TXDIS) { up->acr &= ~UART_ACR_TXDIS; serial_icr_write(up, UART_ACR, up->acr); } } static void sunsu_stop_rx(struct uart_port *port) { struct uart_sunsu_port *up = container_of(port, struct uart_sunsu_port, port); up->ier &= ~UART_IER_RLSI; up->port.read_status_mask &= ~UART_LSR_DR; serial_out(up, UART_IER, up->ier); } static void sunsu_enable_ms(struct uart_port *port) { struct uart_sunsu_port *up = container_of(port, struct uart_sunsu_port, port); unsigned long flags; spin_lock_irqsave(&up->port.lock, flags); up->ier |= UART_IER_MSI; serial_out(up, UART_IER, up->ier); spin_unlock_irqrestore(&up->port.lock, flags); } static void receive_chars(struct uart_sunsu_port *up, unsigned char *status) { struct tty_port *port = &up->port.state->port; unsigned char ch, flag; int max_count = 256; int saw_console_brk = 0; do { ch = serial_inp(up, UART_RX); flag = TTY_NORMAL; up->port.icount.rx++; if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE | UART_LSR_FE | UART_LSR_OE))) { /* * For statistics only */ if (*status & UART_LSR_BI) { *status &= ~(UART_LSR_FE | UART_LSR_PE); up->port.icount.brk++; if (up->port.cons != NULL && up->port.line == up->port.cons->index) saw_console_brk = 1; /* * We do the SysRQ and SAK checking * here because otherwise the break * may get masked by ignore_status_mask * or read_status_mask. */ if (uart_handle_break(&up->port)) goto ignore_char; } else if (*status & UART_LSR_PE) up->port.icount.parity++; else if (*status & UART_LSR_FE) up->port.icount.frame++; if (*status & UART_LSR_OE) up->port.icount.overrun++; /* * Mask off conditions which should be ingored. */ *status &= up->port.read_status_mask; if (up->port.cons != NULL && up->port.line == up->port.cons->index) { /* Recover the break flag from console xmit */ *status |= up->lsr_break_flag; up->lsr_break_flag = 0; } if (*status & UART_LSR_BI) { flag = TTY_BREAK; } else if (*status & UART_LSR_PE) flag = TTY_PARITY; else if (*status & UART_LSR_FE) flag = TTY_FRAME; } if (uart_handle_sysrq_char(&up->port, ch)) goto ignore_char; if ((*status & up->port.ignore_status_mask) == 0) tty_insert_flip_char(port, ch, flag); if (*status & UART_LSR_OE) /* * Overrun is special, since it's reported * immediately, and doesn't affect the current * character. */ tty_insert_flip_char(port, 0, TTY_OVERRUN); ignore_char: *status = serial_inp(up, UART_LSR); } while ((*status & UART_LSR_DR) && (max_count-- > 0)); if (saw_console_brk) sun_do_break(); } static void transmit_chars(struct uart_sunsu_port *up) { struct circ_buf *xmit = &up->port.state->xmit; int count; if (up->port.x_char) { serial_outp(up, UART_TX, up->port.x_char); up->port.icount.tx++; up->port.x_char = 0; return; } if (uart_tx_stopped(&up->port)) { sunsu_stop_tx(&up->port); return; } if (uart_circ_empty(xmit)) { __stop_tx(up); return; } count = up->port.fifosize; do { serial_out(up, UART_TX, xmit->buf[xmit->tail]); xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); up->port.icount.tx++; if (uart_circ_empty(xmit)) break; } while (--count > 0); if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) uart_write_wakeup(&up->port); if (uart_circ_empty(xmit)) __stop_tx(up); } static void check_modem_status(struct uart_sunsu_port *up) { int status; status = serial_in(up, UART_MSR); if ((status & UART_MSR_ANY_DELTA) == 0) return; if (status & UART_MSR_TERI) up->port.icount.rng++; if (status & UART_MSR_DDSR) up->port.icount.dsr++; if (status & UART_MSR_DDCD) uart_handle_dcd_change(&up->port, status & UART_MSR_DCD); if (status & UART_MSR_DCTS) uart_handle_cts_change(&up->port, status & UART_MSR_CTS); wake_up_interruptible(&up->port.state->port.delta_msr_wait); } static irqreturn_t sunsu_serial_interrupt(int irq, void *dev_id) { struct uart_sunsu_port *up = dev_id; unsigned long flags; unsigned char status; spin_lock_irqsave(&up->port.lock, flags); do { status = serial_inp(up, UART_LSR); if (status & UART_LSR_DR) receive_chars(up, &status); check_modem_status(up); if (status & UART_LSR_THRE) transmit_chars(up); tty_flip_buffer_push(&up->port.state->port); } while (!(serial_in(up, UART_IIR) & UART_IIR_NO_INT)); spin_unlock_irqrestore(&up->port.lock, flags); return IRQ_HANDLED; } /* Separate interrupt handling path for keyboard/mouse ports. */ static void sunsu_change_speed(struct uart_port *port, unsigned int cflag, unsigned int iflag, unsigned int quot); static void sunsu_change_mouse_baud(struct uart_sunsu_port *up) { unsigned int cur_cflag = up->cflag; int quot, new_baud; up->cflag &= ~CBAUD; up->cflag |= suncore_mouse_baud_cflag_next(cur_cflag, &new_baud); quot = up->port.uartclk / (16 * new_baud); sunsu_change_speed(&up->port, up->cflag, 0, quot); } static void receive_kbd_ms_chars(struct uart_sunsu_port *up, int is_break) { do { unsigned char ch = serial_inp(up, UART_RX); /* Stop-A is handled by drivers/char/keyboard.c now. */ if (up->su_type == SU_PORT_KBD) { #ifdef CONFIG_SERIO serio_interrupt(&up->serio, ch, 0); #endif } else if (up->su_type == SU_PORT_MS) { int ret = suncore_mouse_baud_detection(ch, is_break); switch (ret) { case 2: sunsu_change_mouse_baud(up); fallthrough; case 1: break; case 0: #ifdef CONFIG_SERIO serio_interrupt(&up->serio, ch, 0); #endif break; } } } while (serial_in(up, UART_LSR) & UART_LSR_DR); } static irqreturn_t sunsu_kbd_ms_interrupt(int irq, void *dev_id) { struct uart_sunsu_port *up = dev_id; if (!(serial_in(up, UART_IIR) & UART_IIR_NO_INT)) { unsigned char status = serial_inp(up, UART_LSR); if ((status & UART_LSR_DR) || (status & UART_LSR_BI)) receive_kbd_ms_chars(up, (status & UART_LSR_BI) != 0); } return IRQ_HANDLED; } static unsigned int sunsu_tx_empty(struct uart_port *port) { struct uart_sunsu_port *up = container_of(port, struct uart_sunsu_port, port); unsigned long flags; unsigned int ret; spin_lock_irqsave(&up->port.lock, flags); ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0; spin_unlock_irqrestore(&up->port.lock, flags); return ret; } static unsigned int sunsu_get_mctrl(struct uart_port *port) { struct uart_sunsu_port *up = container_of(port, struct uart_sunsu_port, port); unsigned char status; unsigned int ret; status = serial_in(up, UART_MSR); ret = 0; if (status & UART_MSR_DCD) ret |= TIOCM_CAR; if (status & UART_MSR_RI) ret |= TIOCM_RNG; if (status & UART_MSR_DSR) ret |= TIOCM_DSR; if (status & UART_MSR_CTS) ret |= TIOCM_CTS; return ret; } static void sunsu_set_mctrl(struct uart_port *port, unsigned int mctrl) { struct uart_sunsu_port *up = container_of(port, struct uart_sunsu_port, port); unsigned char mcr = 0; if (mctrl & TIOCM_RTS) mcr |= UART_MCR_RTS; if (mctrl & TIOCM_DTR) mcr |= UART_MCR_DTR; if (mctrl & TIOCM_OUT1) mcr |= UART_MCR_OUT1; if (mctrl & TIOCM_OUT2) mcr |= UART_MCR_OUT2; if (mctrl & TIOCM_LOOP) mcr |= UART_MCR_LOOP; serial_out(up, UART_MCR, mcr); } static void sunsu_break_ctl(struct uart_port *port, int break_state) { struct uart_sunsu_port *up = container_of(port, struct uart_sunsu_port, port); unsigned long flags; spin_lock_irqsave(&up->port.lock, flags); if (break_state == -1) up->lcr |= UART_LCR_SBC; else up->lcr &= ~UART_LCR_SBC; serial_out(up, UART_LCR, up->lcr); spin_unlock_irqrestore(&up->port.lock, flags); } static int sunsu_startup(struct uart_port *port) { struct uart_sunsu_port *up = container_of(port, struct uart_sunsu_port, port); unsigned long flags; int retval; if (up->port.type == PORT_16C950) { /* Wake up and initialize UART */ up->acr = 0; serial_outp(up, UART_LCR, 0xBF); serial_outp(up, UART_EFR, UART_EFR_ECB); serial_outp(up, UART_IER, 0); serial_outp(up, UART_LCR, 0); serial_icr_write(up, UART_CSR, 0); /* Reset the UART */ serial_outp(up, UART_LCR, 0xBF); serial_outp(up, UART_EFR, UART_EFR_ECB); serial_outp(up, UART_LCR, 0); } #ifdef CONFIG_SERIAL_8250_RSA /* * If this is an RSA port, see if we can kick it up to the * higher speed clock. */ enable_rsa(up); #endif /* * Clear the FIFO buffers and disable them. * (they will be reenabled in set_termios()) */ if (uart_config[up->port.type].flags & UART_CLEAR_FIFO) { serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO); serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); serial_outp(up, UART_FCR, 0); } /* * Clear the interrupt registers. */ (void) serial_inp(up, UART_LSR); (void) serial_inp(up, UART_RX); (void) serial_inp(up, UART_IIR); (void) serial_inp(up, UART_MSR); /* * At this point, there's no way the LSR could still be 0xff; * if it is, then bail out, because there's likely no UART * here. */ if (!(up->port.flags & UPF_BUGGY_UART) && (serial_inp(up, UART_LSR) == 0xff)) { printk("ttyS%d: LSR safety check engaged!\n", up->port.line); return -ENODEV; } if (up->su_type != SU_PORT_PORT) { retval = request_irq(up->port.irq, sunsu_kbd_ms_interrupt, IRQF_SHARED, su_typev[up->su_type], up); } else { retval = request_irq(up->port.irq, sunsu_serial_interrupt, IRQF_SHARED, su_typev[up->su_type], up); } if (retval) { printk("su: Cannot register IRQ %d\n", up->port.irq); return retval; } /* * Now, initialize the UART */ serial_outp(up, UART_LCR, UART_LCR_WLEN8); spin_lock_irqsave(&up->port.lock, flags); up->port.mctrl |= TIOCM_OUT2; sunsu_set_mctrl(&up->port, up->port.mctrl); spin_unlock_irqrestore(&up->port.lock, flags); /* * Finally, enable interrupts. Note: Modem status interrupts * are set via set_termios(), which will be occurring imminently * anyway, so we don't enable them here. */ up->ier = UART_IER_RLSI | UART_IER_RDI; serial_outp(up, UART_IER, up->ier); if (up->port.flags & UPF_FOURPORT) { unsigned int icp; /* * Enable interrupts on the AST Fourport board */ icp = (up->port.iobase & 0xfe0) | 0x01f; outb_p(0x80, icp); (void) inb_p(icp); } /* * And clear the interrupt registers again for luck. */ (void) serial_inp(up, UART_LSR); (void) serial_inp(up, UART_RX); (void) serial_inp(up, UART_IIR); (void) serial_inp(up, UART_MSR); return 0; } static void sunsu_shutdown(struct uart_port *port) { struct uart_sunsu_port *up = container_of(port, struct uart_sunsu_port, port); unsigned long flags; /* * Disable interrupts from this port */ up->ier = 0; serial_outp(up, UART_IER, 0); spin_lock_irqsave(&up->port.lock, flags); if (up->port.flags & UPF_FOURPORT) { /* reset interrupts on the AST Fourport board */ inb((up->port.iobase & 0xfe0) | 0x1f); up->port.mctrl |= TIOCM_OUT1; } else up->port.mctrl &= ~TIOCM_OUT2; sunsu_set_mctrl(&up->port, up->port.mctrl); spin_unlock_irqrestore(&up->port.lock, flags); /* * Disable break condition and FIFOs */ serial_out(up, UART_LCR, serial_inp(up, UART_LCR) & ~UART_LCR_SBC); serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); serial_outp(up, UART_FCR, 0); #ifdef CONFIG_SERIAL_8250_RSA /* * Reset the RSA board back to 115kbps compat mode. */ disable_rsa(up); #endif /* * Read data port to reset things. */ (void) serial_in(up, UART_RX); free_irq(up->port.irq, up); } static void sunsu_change_speed(struct uart_port *port, unsigned int cflag, unsigned int iflag, unsigned int quot) { struct uart_sunsu_port *up = container_of(port, struct uart_sunsu_port, port); unsigned char cval, fcr = 0; unsigned long flags; switch (cflag & CSIZE) { case CS5: cval = 0x00; break; case CS6: cval = 0x01; break; case CS7: cval = 0x02; break; default: case CS8: cval = 0x03; break; } if (cflag & CSTOPB) cval |= 0x04; if (cflag & PARENB) cval |= UART_LCR_PARITY; if (!(cflag & PARODD)) cval |= UART_LCR_EPAR; if (cflag & CMSPAR) cval |= UART_LCR_SPAR; /* * Work around a bug in the Oxford Semiconductor 952 rev B * chip which causes it to seriously miscalculate baud rates * when DLL is 0. */ if ((quot & 0xff) == 0 && up->port.type == PORT_16C950 && up->rev == 0x5201) quot ++; if (uart_config[up->port.type].flags & UART_USE_FIFO) { if ((up->port.uartclk / quot) < (2400 * 16)) fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_1; #ifdef CONFIG_SERIAL_8250_RSA else if (up->port.type == PORT_RSA) fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_14; #endif else fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_8; } if (up->port.type == PORT_16750) fcr |= UART_FCR7_64BYTE; /* * Ok, we're now changing the port state. Do it with * interrupts disabled. */ spin_lock_irqsave(&up->port.lock, flags); /* * Update the per-port timeout. */ uart_update_timeout(port, cflag, (port->uartclk / (16 * quot))); up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; if (iflag & INPCK) up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE; if (iflag & (IGNBRK | BRKINT | PARMRK)) up->port.read_status_mask |= UART_LSR_BI; /* * Characteres to ignore */ up->port.ignore_status_mask = 0; if (iflag & IGNPAR) up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; if (iflag & IGNBRK) { up->port.ignore_status_mask |= UART_LSR_BI; /* * If we're ignoring parity and break indicators, * ignore overruns too (for real raw support). */ if (iflag & IGNPAR) up->port.ignore_status_mask |= UART_LSR_OE; } /* * ignore all characters if CREAD is not set */ if ((cflag & CREAD) == 0) up->port.ignore_status_mask |= UART_LSR_DR; /* * CTS flow control flag and modem status interrupts */ up->ier &= ~UART_IER_MSI; if (UART_ENABLE_MS(&up->port, cflag)) up->ier |= UART_IER_MSI; serial_out(up, UART_IER, up->ier); if (uart_config[up->port.type].flags & UART_STARTECH) { serial_outp(up, UART_LCR, 0xBF); serial_outp(up, UART_EFR, cflag & CRTSCTS ? UART_EFR_CTS :0); } serial_outp(up, UART_LCR, cval | UART_LCR_DLAB);/* set DLAB */ serial_outp(up, UART_DLL, quot & 0xff); /* LS of divisor */ serial_outp(up, UART_DLM, quot >> 8); /* MS of divisor */ if (up->port.type == PORT_16750) serial_outp(up, UART_FCR, fcr); /* set fcr */ serial_outp(up, UART_LCR, cval); /* reset DLAB */ up->lcr = cval; /* Save LCR */ if (up->port.type != PORT_16750) { if (fcr & UART_FCR_ENABLE_FIFO) { /* emulated UARTs (Lucent Venus 167x) need two steps */ serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO); } serial_outp(up, UART_FCR, fcr); /* set fcr */ } up->cflag = cflag; spin_unlock_irqrestore(&up->port.lock, flags); } static void sunsu_set_termios(struct uart_port *port, struct ktermios *termios, struct ktermios *old) { unsigned int baud, quot; /* * Ask the core to calculate the divisor for us. */ baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); quot = uart_get_divisor(port, baud); sunsu_change_speed(port, termios->c_cflag, termios->c_iflag, quot); } static void sunsu_release_port(struct uart_port *port) { } static int sunsu_request_port(struct uart_port *port) { return 0; } static void sunsu_config_port(struct uart_port *port, int flags) { struct uart_sunsu_port *up = container_of(port, struct uart_sunsu_port, port); if (flags & UART_CONFIG_TYPE) { /* * We are supposed to call autoconfig here, but this requires * splitting all the OBP probing crap from the UART probing. * We'll do it when we kill sunsu.c altogether. */ port->type = up->type_probed; /* XXX */ } } static int sunsu_verify_port(struct uart_port *port, struct serial_struct *ser) { return -EINVAL; } static const char * sunsu_type(struct uart_port *port) { int type = port->type; if (type >= ARRAY_SIZE(uart_config)) type = 0; return uart_config[type].name; } static const struct uart_ops sunsu_pops = { .tx_empty = sunsu_tx_empty, .set_mctrl = sunsu_set_mctrl, .get_mctrl = sunsu_get_mctrl, .stop_tx = sunsu_stop_tx, .start_tx = sunsu_start_tx, .stop_rx = sunsu_stop_rx, .enable_ms = sunsu_enable_ms, .break_ctl = sunsu_break_ctl, .startup = sunsu_startup, .shutdown = sunsu_shutdown, .set_termios = sunsu_set_termios, .type = sunsu_type, .release_port = sunsu_release_port, .request_port = sunsu_request_port, .config_port = sunsu_config_port, .verify_port = sunsu_verify_port, }; #define UART_NR 4 static struct uart_sunsu_port sunsu_ports[UART_NR]; static int nr_inst; /* Number of already registered ports */ #ifdef CONFIG_SERIO static DEFINE_SPINLOCK(sunsu_serio_lock); static int sunsu_serio_write(struct serio *serio, unsigned char ch) { struct uart_sunsu_port *up = serio->port_data; unsigned long flags; int lsr; spin_lock_irqsave(&sunsu_serio_lock, flags); do { lsr = serial_in(up, UART_LSR); } while (!(lsr & UART_LSR_THRE)); /* Send the character out. */ serial_out(up, UART_TX, ch); spin_unlock_irqrestore(&sunsu_serio_lock, flags); return 0; } static int sunsu_serio_open(struct serio *serio) { struct uart_sunsu_port *up = serio->port_data; unsigned long flags; int ret; spin_lock_irqsave(&sunsu_serio_lock, flags); if (!up->serio_open) { up->serio_open = 1; ret = 0; } else ret = -EBUSY; spin_unlock_irqrestore(&sunsu_serio_lock, flags); return ret; } static void sunsu_serio_close(struct serio *serio) { struct uart_sunsu_port *up = serio->port_data; unsigned long flags; spin_lock_irqsave(&sunsu_serio_lock, flags); up->serio_open = 0; spin_unlock_irqrestore(&sunsu_serio_lock, flags); } #endif /* CONFIG_SERIO */ static void sunsu_autoconfig(struct uart_sunsu_port *up) { unsigned char status1, status2, scratch, scratch2, scratch3; unsigned char save_lcr, save_mcr; unsigned long flags; if (up->su_type == SU_PORT_NONE) return; up->type_probed = PORT_UNKNOWN; up->port.iotype = UPIO_MEM; spin_lock_irqsave(&up->port.lock, flags); if (!(up->port.flags & UPF_BUGGY_UART)) { /* * Do a simple existence test first; if we fail this, there's * no point trying anything else. * * 0x80 is used as a nonsense port to prevent against false * positives due to ISA bus float. The assumption is that * 0x80 is a non-existent port; which should be safe since * include/asm/io.h also makes this assumption. */ scratch = serial_inp(up, UART_IER); serial_outp(up, UART_IER, 0); #ifdef __i386__ outb(0xff, 0x080); #endif scratch2 = serial_inp(up, UART_IER); serial_outp(up, UART_IER, 0x0f); #ifdef __i386__ outb(0, 0x080); #endif scratch3 = serial_inp(up, UART_IER); serial_outp(up, UART_IER, scratch); if (scratch2 != 0 || scratch3 != 0x0F) goto out; /* We failed; there's nothing here */ } save_mcr = serial_in(up, UART_MCR); save_lcr = serial_in(up, UART_LCR); /* * Check to see if a UART is really there. Certain broken * internal modems based on the Rockwell chipset fail this * test, because they apparently don't implement the loopback * test mode. So this test is skipped on the COM 1 through * COM 4 ports. This *should* be safe, since no board * manufacturer would be stupid enough to design a board * that conflicts with COM 1-4 --- we hope! */ if (!(up->port.flags & UPF_SKIP_TEST)) { serial_outp(up, UART_MCR, UART_MCR_LOOP | 0x0A); status1 = serial_inp(up, UART_MSR) & 0xF0; serial_outp(up, UART_MCR, save_mcr); if (status1 != 0x90) goto out; /* We failed loopback test */ } serial_outp(up, UART_LCR, 0xBF); /* set up for StarTech test */ serial_outp(up, UART_EFR, 0); /* EFR is the same as FCR */ serial_outp(up, UART_LCR, 0); serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO); scratch = serial_in(up, UART_IIR) >> 6; switch (scratch) { case 0: up->port.type = PORT_16450; break; case 1: up->port.type = PORT_UNKNOWN; break; case 2: up->port.type = PORT_16550; break; case 3: up->port.type = PORT_16550A; break; } if (up->port.type == PORT_16550A) { /* Check for Startech UART's */ serial_outp(up, UART_LCR, UART_LCR_DLAB); if (serial_in(up, UART_EFR) == 0) { up->port.type = PORT_16650; } else { serial_outp(up, UART_LCR, 0xBF); if (serial_in(up, UART_EFR) == 0) up->port.type = PORT_16650V2; } } if (up->port.type == PORT_16550A) { /* Check for TI 16750 */ serial_outp(up, UART_LCR, save_lcr | UART_LCR_DLAB); serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE); scratch = serial_in(up, UART_IIR) >> 5; if (scratch == 7) { /* * If this is a 16750, and not a cheap UART * clone, then it should only go into 64 byte * mode if the UART_FCR7_64BYTE bit was set * while UART_LCR_DLAB was latched. */ serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO); serial_outp(up, UART_LCR, 0); serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE); scratch = serial_in(up, UART_IIR) >> 5; if (scratch == 6) up->port.type = PORT_16750; } serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO); } serial_outp(up, UART_LCR, save_lcr); if (up->port.type == PORT_16450) { scratch = serial_in(up, UART_SCR); serial_outp(up, UART_SCR, 0xa5); status1 = serial_in(up, UART_SCR); serial_outp(up, UART_SCR, 0x5a); status2 = serial_in(up, UART_SCR); serial_outp(up, UART_SCR, scratch); if ((status1 != 0xa5) || (status2 != 0x5a)) up->port.type = PORT_8250; } up->port.fifosize = uart_config[up->port.type].dfl_xmit_fifo_size; if (up->port.type == PORT_UNKNOWN) goto out; up->type_probed = up->port.type; /* XXX */ /* * Reset the UART. */ #ifdef CONFIG_SERIAL_8250_RSA if (up->port.type == PORT_RSA) serial_outp(up, UART_RSA_FRR, 0); #endif serial_outp(up, UART_MCR, save_mcr); serial_outp(up, UART_FCR, (UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT)); serial_outp(up, UART_FCR, 0); (void)serial_in(up, UART_RX); serial_outp(up, UART_IER, 0); out: spin_unlock_irqrestore(&up->port.lock, flags); } static struct uart_driver sunsu_reg = { .owner = THIS_MODULE, .driver_name = "sunsu", .dev_name = "ttyS", .major = TTY_MAJOR, }; static int sunsu_kbd_ms_init(struct uart_sunsu_port *up) { int quot, baud; #ifdef CONFIG_SERIO struct serio *serio; #endif if (up->su_type == SU_PORT_KBD) { up->cflag = B1200 | CS8 | CLOCAL | CREAD; baud = 1200; } else { up->cflag = B4800 | CS8 | CLOCAL | CREAD; baud = 4800; } quot = up->port.uartclk / (16 * baud); sunsu_autoconfig(up); if (up->port.type == PORT_UNKNOWN) return -ENODEV; printk("%pOF: %s port at %llx, irq %u\n", up->port.dev->of_node, (up->su_type == SU_PORT_KBD) ? "Keyboard" : "Mouse", (unsigned long long) up->port.mapbase, up->port.irq); #ifdef CONFIG_SERIO serio = &up->serio; serio->port_data = up; serio->id.type = SERIO_RS232; if (up->su_type == SU_PORT_KBD) { serio->id.proto = SERIO_SUNKBD; strlcpy(serio->name, "sukbd", sizeof(serio->name)); } else { serio->id.proto = SERIO_SUN; serio->id.extra = 1; strlcpy(serio->name, "sums", sizeof(serio->name)); } strlcpy(serio->phys, (!(up->port.line & 1) ? "su/serio0" : "su/serio1"), sizeof(serio->phys)); serio->write = sunsu_serio_write; serio->open = sunsu_serio_open; serio->close = sunsu_serio_close; serio->dev.parent = up->port.dev; serio_register_port(serio); #endif sunsu_change_speed(&up->port, up->cflag, 0, quot); sunsu_startup(&up->port); return 0; } /* * ------------------------------------------------------------ * Serial console driver * ------------------------------------------------------------ */ #ifdef CONFIG_SERIAL_SUNSU_CONSOLE #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE) /* * Wait for transmitter & holding register to empty */ static void wait_for_xmitr(struct uart_sunsu_port *up) { unsigned int status, tmout = 10000; /* Wait up to 10ms for the character(s) to be sent. */ do { status = serial_in(up, UART_LSR); if (status & UART_LSR_BI) up->lsr_break_flag = UART_LSR_BI; if (--tmout == 0) break; udelay(1); } while ((status & BOTH_EMPTY) != BOTH_EMPTY); /* Wait up to 1s for flow control if necessary */ if (up->port.flags & UPF_CONS_FLOW) { tmout = 1000000; while (--tmout && ((serial_in(up, UART_MSR) & UART_MSR_CTS) == 0)) udelay(1); } } static void sunsu_console_putchar(struct uart_port *port, unsigned char ch) { struct uart_sunsu_port *up = container_of(port, struct uart_sunsu_port, port); wait_for_xmitr(up); serial_out(up, UART_TX, ch); } /* * Print a string to the serial port trying not to disturb * any possible real use of the port... */ static void sunsu_console_write(struct console *co, const char *s, unsigned int count) { struct uart_sunsu_port *up = &sunsu_ports[co->index]; unsigned long flags; unsigned int ier; int locked = 1; if (up->port.sysrq || oops_in_progress) locked = spin_trylock_irqsave(&up->port.lock, flags); else spin_lock_irqsave(&up->port.lock, flags); /* * First save the UER then disable the interrupts */ ier = serial_in(up, UART_IER); serial_out(up, UART_IER, 0); uart_console_write(&up->port, s, count, sunsu_console_putchar); /* * Finally, wait for transmitter to become empty * and restore the IER */ wait_for_xmitr(up); serial_out(up, UART_IER, ier); if (locked) spin_unlock_irqrestore(&up->port.lock, flags); } /* * Setup initial baud/bits/parity. We do two things here: * - construct a cflag setting for the first su_open() * - initialize the serial port * Return non-zero if we didn't find a serial port. */ static int __init sunsu_console_setup(struct console *co, char *options) { static struct ktermios dummy; struct ktermios termios; struct uart_port *port; printk("Console: ttyS%d (SU)\n", (sunsu_reg.minor - 64) + co->index); if (co->index > nr_inst) return -ENODEV; port = &sunsu_ports[co->index].port; /* * Temporary fix. */ spin_lock_init(&port->lock); /* Get firmware console settings. */ sunserial_console_termios(co, port->dev->of_node); memset(&termios, 0, sizeof(struct ktermios)); termios.c_cflag = co->cflag; port->mctrl |= TIOCM_DTR; port->ops->set_termios(port, &termios, &dummy); return 0; } static struct console sunsu_console = { .name = "ttyS", .write = sunsu_console_write, .device = uart_console_device, .setup = sunsu_console_setup, .flags = CON_PRINTBUFFER, .index = -1, .data = &sunsu_reg, }; /* * Register console. */ static inline struct console *SUNSU_CONSOLE(void) { return &sunsu_console; } #else #define SUNSU_CONSOLE() (NULL) #define sunsu_serial_console_init() do { } while (0) #endif static enum su_type su_get_type(struct device_node *dp) { struct device_node *ap = of_find_node_by_path("/aliases"); enum su_type rc = SU_PORT_PORT; if (ap) { const char *keyb = of_get_property(ap, "keyboard", NULL); const char *ms = of_get_property(ap, "mouse", NULL); struct device_node *match; if (keyb) { match = of_find_node_by_path(keyb); /* * The pointer is used as an identifier not * as a pointer, we can drop the refcount on * the of__node immediately after getting it. */ of_node_put(match); if (dp == match) { rc = SU_PORT_KBD; goto out; } } if (ms) { match = of_find_node_by_path(ms); of_node_put(match); if (dp == match) { rc = SU_PORT_MS; goto out; } } } out: of_node_put(ap); return rc; } static int su_probe(struct platform_device *op) { struct device_node *dp = op->dev.of_node; struct uart_sunsu_port *up; struct resource *rp; enum su_type type; bool ignore_line; int err; type = su_get_type(dp); if (type == SU_PORT_PORT) { if (nr_inst >= UART_NR) return -EINVAL; up = &sunsu_ports[nr_inst]; } else { up = kzalloc(sizeof(*up), GFP_KERNEL); if (!up) return -ENOMEM; } up->port.line = nr_inst; spin_lock_init(&up->port.lock); up->su_type = type; rp = &op->resource[0]; up->port.mapbase = rp->start; up->reg_size = resource_size(rp); up->port.membase = of_ioremap(rp, 0, up->reg_size, "su"); if (!up->port.membase) { if (type != SU_PORT_PORT) kfree(up); return -ENOMEM; } up->port.irq = op->archdata.irqs[0]; up->port.dev = &op->dev; up->port.type = PORT_UNKNOWN; up->port.uartclk = (SU_BASE_BAUD * 16); up->port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_SUNSU_CONSOLE); err = 0; if (up->su_type == SU_PORT_KBD || up->su_type == SU_PORT_MS) { err = sunsu_kbd_ms_init(up); if (err) { of_iounmap(&op->resource[0], up->port.membase, up->reg_size); kfree(up); return err; } platform_set_drvdata(op, up); nr_inst++; return 0; } up->port.flags |= UPF_BOOT_AUTOCONF; sunsu_autoconfig(up); err = -ENODEV; if (up->port.type == PORT_UNKNOWN) goto out_unmap; up->port.ops = &sunsu_pops; ignore_line = false; if (of_node_name_eq(dp, "rsc-console") || of_node_name_eq(dp, "lom-console")) ignore_line = true; sunserial_console_match(SUNSU_CONSOLE(), dp, &sunsu_reg, up->port.line, ignore_line); err = uart_add_one_port(&sunsu_reg, &up->port); if (err) goto out_unmap; platform_set_drvdata(op, up); nr_inst++; return 0; out_unmap: of_iounmap(&op->resource[0], up->port.membase, up->reg_size); kfree(up); return err; } static int su_remove(struct platform_device *op) { struct uart_sunsu_port *up = platform_get_drvdata(op); bool kbdms = false; if (up->su_type == SU_PORT_MS || up->su_type == SU_PORT_KBD) kbdms = true; if (kbdms) { #ifdef CONFIG_SERIO serio_unregister_port(&up->serio); #endif } else if (up->port.type != PORT_UNKNOWN) uart_remove_one_port(&sunsu_reg, &up->port); if (up->port.membase) of_iounmap(&op->resource[0], up->port.membase, up->reg_size); if (kbdms) kfree(up); return 0; } static const struct of_device_id su_match[] = { { .name = "su", }, { .name = "su_pnp", }, { .name = "serial", .compatible = "su", }, { .type = "serial", .compatible = "su", }, {}, }; MODULE_DEVICE_TABLE(of, su_match); static struct platform_driver su_driver = { .driver = { .name = "su", .of_match_table = su_match, }, .probe = su_probe, .remove = su_remove, }; static int __init sunsu_init(void) { struct device_node *dp; int err; int num_uart = 0; for_each_node_by_name(dp, "su") { if (su_get_type(dp) == SU_PORT_PORT) num_uart++; } for_each_node_by_name(dp, "su_pnp") { if (su_get_type(dp) == SU_PORT_PORT) num_uart++; } for_each_node_by_name(dp, "serial") { if (of_device_is_compatible(dp, "su")) { if (su_get_type(dp) == SU_PORT_PORT) num_uart++; } } for_each_node_by_type(dp, "serial") { if (of_device_is_compatible(dp, "su")) { if (su_get_type(dp) == SU_PORT_PORT) num_uart++; } } if (num_uart) { err = sunserial_register_minors(&sunsu_reg, num_uart); if (err) return err; } err = platform_driver_register(&su_driver); if (err && num_uart) sunserial_unregister_minors(&sunsu_reg, num_uart); return err; } static void __exit sunsu_exit(void) { platform_driver_unregister(&su_driver); if (sunsu_reg.nr) sunserial_unregister_minors(&sunsu_reg, sunsu_reg.nr); } module_init(sunsu_init); module_exit(sunsu_exit); MODULE_AUTHOR("Eddie C. Dost, Peter Zaitcev, and David S. Miller"); MODULE_DESCRIPTION("Sun SU serial port driver"); MODULE_VERSION("2.0"); MODULE_LICENSE("GPL");