xref: /openbmc/linux/drivers/tty/moxa.c (revision 95713967)
1 // SPDX-License-Identifier: GPL-2.0+
2 /*****************************************************************************/
3 /*
4  *           moxa.c  -- MOXA Intellio family multiport serial driver.
5  *
6  *      Copyright (C) 1999-2000  Moxa Technologies (support@moxa.com).
7  *      Copyright (c) 2007 Jiri Slaby <jirislaby@gmail.com>
8  *
9  *      This code is loosely based on the Linux serial driver, written by
10  *      Linus Torvalds, Theodore T'so and others.
11  */
12 
13 /*
14  *    MOXA Intellio Series Driver
15  *      for             : LINUX
16  *      date            : 1999/1/7
17  *      version         : 5.1
18  */
19 
20 #include <linux/module.h>
21 #include <linux/types.h>
22 #include <linux/mm.h>
23 #include <linux/ioport.h>
24 #include <linux/errno.h>
25 #include <linux/firmware.h>
26 #include <linux/signal.h>
27 #include <linux/sched.h>
28 #include <linux/timer.h>
29 #include <linux/interrupt.h>
30 #include <linux/tty.h>
31 #include <linux/tty_flip.h>
32 #include <linux/major.h>
33 #include <linux/string.h>
34 #include <linux/fcntl.h>
35 #include <linux/ptrace.h>
36 #include <linux/serial.h>
37 #include <linux/tty_driver.h>
38 #include <linux/delay.h>
39 #include <linux/pci.h>
40 #include <linux/init.h>
41 #include <linux/bitops.h>
42 #include <linux/slab.h>
43 #include <linux/ratelimit.h>
44 
45 #include <asm/io.h>
46 #include <linux/uaccess.h>
47 
48 #define	MOXA			0x400
49 #define MOXA_GET_IQUEUE		(MOXA + 1)	/* get input buffered count */
50 #define MOXA_GET_OQUEUE		(MOXA + 2)	/* get output buffered count */
51 #define MOXA_GETDATACOUNT       (MOXA + 23)
52 #define MOXA_GET_IOQUEUE	(MOXA + 27)
53 #define MOXA_FLUSH_QUEUE	(MOXA + 28)
54 #define MOXA_GETMSTATUS         (MOXA + 65)
55 
56 /*
57  *    System Configuration
58  */
59 
60 #define Magic_code	0x404
61 
62 /*
63  *    for C218 BIOS initialization
64  */
65 #define C218_ConfBase	0x800
66 #define C218_status	(C218_ConfBase + 0)	/* BIOS running status    */
67 #define C218_diag	(C218_ConfBase + 2)	/* diagnostic status      */
68 #define C218_key	(C218_ConfBase + 4)	/* WORD (0x218 for C218) */
69 #define C218DLoad_len	(C218_ConfBase + 6)	/* WORD           */
70 #define C218check_sum	(C218_ConfBase + 8)	/* BYTE           */
71 #define C218chksum_ok	(C218_ConfBase + 0x0a)	/* BYTE (1:ok)            */
72 #define C218_TestRx	(C218_ConfBase + 0x10)	/* 8 bytes for 8 ports    */
73 #define C218_TestTx	(C218_ConfBase + 0x18)	/* 8 bytes for 8 ports    */
74 #define C218_RXerr	(C218_ConfBase + 0x20)	/* 8 bytes for 8 ports    */
75 #define C218_ErrFlag	(C218_ConfBase + 0x28)	/* 8 bytes for 8 ports    */
76 
77 #define C218_LoadBuf	0x0F00
78 #define C218_KeyCode	0x218
79 #define CP204J_KeyCode	0x204
80 
81 /*
82  *    for C320 BIOS initialization
83  */
84 #define C320_ConfBase	0x800
85 #define C320_LoadBuf	0x0f00
86 #define STS_init	0x05	/* for C320_status        */
87 
88 #define C320_status	C320_ConfBase + 0	/* BIOS running status    */
89 #define C320_diag	C320_ConfBase + 2	/* diagnostic status      */
90 #define C320_key	C320_ConfBase + 4	/* WORD (0320H for C320) */
91 #define C320DLoad_len	C320_ConfBase + 6	/* WORD           */
92 #define C320check_sum	C320_ConfBase + 8	/* WORD           */
93 #define C320chksum_ok	C320_ConfBase + 0x0a	/* WORD (1:ok)            */
94 #define C320bapi_len	C320_ConfBase + 0x0c	/* WORD           */
95 #define C320UART_no	C320_ConfBase + 0x0e	/* WORD           */
96 
97 #define C320_KeyCode	0x320
98 
99 #define FixPage_addr	0x0000	/* starting addr of static page  */
100 #define DynPage_addr	0x2000	/* starting addr of dynamic page */
101 #define C218_start	0x3000	/* starting addr of C218 BIOS prg */
102 #define Control_reg	0x1ff0	/* select page and reset control */
103 #define HW_reset	0x80
104 
105 /*
106  *    Function Codes
107  */
108 #define FC_CardReset	0x80
109 #define FC_ChannelReset 1	/* C320 firmware not supported */
110 #define FC_EnableCH	2
111 #define FC_DisableCH	3
112 #define FC_SetParam	4
113 #define FC_SetMode	5
114 #define FC_SetRate	6
115 #define FC_LineControl	7
116 #define FC_LineStatus	8
117 #define FC_XmitControl	9
118 #define FC_FlushQueue	10
119 #define FC_SendBreak	11
120 #define FC_StopBreak	12
121 #define FC_LoopbackON	13
122 #define FC_LoopbackOFF	14
123 #define FC_ClrIrqTable	15
124 #define FC_SendXon	16
125 #define FC_SetTermIrq	17	/* C320 firmware not supported */
126 #define FC_SetCntIrq	18	/* C320 firmware not supported */
127 #define FC_SetBreakIrq	19
128 #define FC_SetLineIrq	20
129 #define FC_SetFlowCtl	21
130 #define FC_GenIrq	22
131 #define FC_InCD180	23
132 #define FC_OutCD180	24
133 #define FC_InUARTreg	23
134 #define FC_OutUARTreg	24
135 #define FC_SetXonXoff	25
136 #define FC_OutCD180CCR	26
137 #define FC_ExtIQueue	27
138 #define FC_ExtOQueue	28
139 #define FC_ClrLineIrq	29
140 #define FC_HWFlowCtl	30
141 #define FC_GetClockRate 35
142 #define FC_SetBaud	36
143 #define FC_SetDataMode  41
144 #define FC_GetCCSR      43
145 #define FC_GetDataError 45
146 #define FC_RxControl	50
147 #define FC_ImmSend	51
148 #define FC_SetXonState	52
149 #define FC_SetXoffState	53
150 #define FC_SetRxFIFOTrig 54
151 #define FC_SetTxFIFOCnt 55
152 #define FC_UnixRate	56
153 #define FC_UnixResetTimer 57
154 
155 #define	RxFIFOTrig1	0
156 #define	RxFIFOTrig4	1
157 #define	RxFIFOTrig8	2
158 #define	RxFIFOTrig14	3
159 
160 /*
161  *    Dual-Ported RAM
162  */
163 #define DRAM_global	0
164 #define INT_data	(DRAM_global + 0)
165 #define Config_base	(DRAM_global + 0x108)
166 
167 #define IRQindex	(INT_data + 0)
168 #define IRQpending	(INT_data + 4)
169 #define IRQtable	(INT_data + 8)
170 
171 /*
172  *    Interrupt Status
173  */
174 #define IntrRx		0x01	/* receiver data O.K.             */
175 #define IntrTx		0x02	/* transmit buffer empty  */
176 #define IntrFunc	0x04	/* function complete              */
177 #define IntrBreak	0x08	/* received break         */
178 #define IntrLine	0x10	/* line status change
179 				   for transmitter                */
180 #define IntrIntr	0x20	/* received INTR code             */
181 #define IntrQuit	0x40	/* received QUIT code             */
182 #define IntrEOF		0x80	/* received EOF code              */
183 
184 #define IntrRxTrigger	0x100	/* rx data count reach trigger value */
185 #define IntrTxTrigger	0x200	/* tx data count below trigger value */
186 
187 #define Magic_no	(Config_base + 0)
188 #define Card_model_no	(Config_base + 2)
189 #define Total_ports	(Config_base + 4)
190 #define Module_cnt	(Config_base + 8)
191 #define Module_no	(Config_base + 10)
192 #define Timer_10ms	(Config_base + 14)
193 #define Disable_IRQ	(Config_base + 20)
194 #define TMS320_PORT1	(Config_base + 22)
195 #define TMS320_PORT2	(Config_base + 24)
196 #define TMS320_CLOCK	(Config_base + 26)
197 
198 /*
199  *    DATA BUFFER in DRAM
200  */
201 #define Extern_table	0x400	/* Base address of the external table
202 				   (24 words *    64) total 3K bytes
203 				   (24 words * 128) total 6K bytes */
204 #define Extern_size	0x60	/* 96 bytes                       */
205 #define RXrptr		0x00	/* read pointer for RX buffer     */
206 #define RXwptr		0x02	/* write pointer for RX buffer    */
207 #define TXrptr		0x04	/* read pointer for TX buffer     */
208 #define TXwptr		0x06	/* write pointer for TX buffer    */
209 #define HostStat	0x08	/* IRQ flag and general flag      */
210 #define FlagStat	0x0A
211 #define FlowControl	0x0C	/* B7 B6 B5 B4 B3 B2 B1 B0              */
212 				/*  x  x  x  x  |  |  |  |            */
213 				/*              |  |  |  + CTS flow   */
214 				/*              |  |  +--- RTS flow   */
215 				/*              |  +------ TX Xon/Xoff */
216 				/*              +--------- RX Xon/Xoff */
217 #define Break_cnt	0x0E	/* received break count   */
218 #define CD180TXirq	0x10	/* if non-0: enable TX irq        */
219 #define RX_mask		0x12
220 #define TX_mask		0x14
221 #define Ofs_rxb		0x16
222 #define Ofs_txb		0x18
223 #define Page_rxb	0x1A
224 #define Page_txb	0x1C
225 #define EndPage_rxb	0x1E
226 #define EndPage_txb	0x20
227 #define Data_error	0x22
228 #define RxTrigger	0x28
229 #define TxTrigger	0x2a
230 
231 #define rRXwptr		0x34
232 #define Low_water	0x36
233 
234 #define FuncCode	0x40
235 #define FuncArg		0x42
236 #define FuncArg1	0x44
237 
238 #define C218rx_size	0x2000	/* 8K bytes */
239 #define C218tx_size	0x8000	/* 32K bytes */
240 
241 #define C218rx_mask	(C218rx_size - 1)
242 #define C218tx_mask	(C218tx_size - 1)
243 
244 #define C320p8rx_size	0x2000
245 #define C320p8tx_size	0x8000
246 #define C320p8rx_mask	(C320p8rx_size - 1)
247 #define C320p8tx_mask	(C320p8tx_size - 1)
248 
249 #define C320p16rx_size	0x2000
250 #define C320p16tx_size	0x4000
251 #define C320p16rx_mask	(C320p16rx_size - 1)
252 #define C320p16tx_mask	(C320p16tx_size - 1)
253 
254 #define C320p24rx_size	0x2000
255 #define C320p24tx_size	0x2000
256 #define C320p24rx_mask	(C320p24rx_size - 1)
257 #define C320p24tx_mask	(C320p24tx_size - 1)
258 
259 #define C320p32rx_size	0x1000
260 #define C320p32tx_size	0x1000
261 #define C320p32rx_mask	(C320p32rx_size - 1)
262 #define C320p32tx_mask	(C320p32tx_size - 1)
263 
264 #define Page_size	0x2000U
265 #define Page_mask	(Page_size - 1)
266 #define C218rx_spage	3
267 #define C218tx_spage	4
268 #define C218rx_pageno	1
269 #define C218tx_pageno	4
270 #define C218buf_pageno	5
271 
272 #define C320p8rx_spage	3
273 #define C320p8tx_spage	4
274 #define C320p8rx_pgno	1
275 #define C320p8tx_pgno	4
276 #define C320p8buf_pgno	5
277 
278 #define C320p16rx_spage 3
279 #define C320p16tx_spage 4
280 #define C320p16rx_pgno	1
281 #define C320p16tx_pgno	2
282 #define C320p16buf_pgno 3
283 
284 #define C320p24rx_spage 3
285 #define C320p24tx_spage 4
286 #define C320p24rx_pgno	1
287 #define C320p24tx_pgno	1
288 #define C320p24buf_pgno 2
289 
290 #define C320p32rx_spage 3
291 #define C320p32tx_ofs	C320p32rx_size
292 #define C320p32tx_spage 3
293 #define C320p32buf_pgno 1
294 
295 /*
296  *    Host Status
297  */
298 #define WakeupRx	0x01
299 #define WakeupTx	0x02
300 #define WakeupBreak	0x08
301 #define WakeupLine	0x10
302 #define WakeupIntr	0x20
303 #define WakeupQuit	0x40
304 #define WakeupEOF	0x80	/* used in VTIME control */
305 #define WakeupRxTrigger	0x100
306 #define WakeupTxTrigger	0x200
307 /*
308  *    Flag status
309  */
310 #define Rx_over		0x01
311 #define Xoff_state	0x02
312 #define Tx_flowOff	0x04
313 #define Tx_enable	0x08
314 #define CTS_state	0x10
315 #define DSR_state	0x20
316 #define DCD_state	0x80
317 /*
318  *    FlowControl
319  */
320 #define CTS_FlowCtl	1
321 #define RTS_FlowCtl	2
322 #define Tx_FlowCtl	4
323 #define Rx_FlowCtl	8
324 #define IXM_IXANY	0x10
325 
326 #define LowWater	128
327 
328 #define DTR_ON		1
329 #define RTS_ON		2
330 #define CTS_ON		1
331 #define DSR_ON		2
332 #define DCD_ON		8
333 
334 /* mode definition */
335 #define	MX_CS8		0x03
336 #define	MX_CS7		0x02
337 #define	MX_CS6		0x01
338 #define	MX_CS5		0x00
339 
340 #define	MX_STOP1	0x00
341 #define	MX_STOP15	0x04
342 #define	MX_STOP2	0x08
343 
344 #define	MX_PARNONE	0x00
345 #define	MX_PAREVEN	0x40
346 #define	MX_PARODD	0xC0
347 #define	MX_PARMARK	0xA0
348 #define	MX_PARSPACE	0x20
349 
350 #define MOXA_VERSION		"6.0k"
351 
352 #define MOXA_FW_HDRLEN		32
353 
354 #define MOXAMAJOR		172
355 
356 #define MAX_BOARDS		4	/* Don't change this value */
357 #define MAX_PORTS_PER_BOARD	32	/* Don't change this value */
358 #define MAX_PORTS		(MAX_BOARDS * MAX_PORTS_PER_BOARD)
359 
360 #define MOXA_IS_320(brd) ((brd)->boardType == MOXA_BOARD_C320_ISA || \
361 		(brd)->boardType == MOXA_BOARD_C320_PCI)
362 
363 /*
364  *    Define the Moxa PCI vendor and device IDs.
365  */
366 #define MOXA_BUS_TYPE_ISA	0
367 #define MOXA_BUS_TYPE_PCI	1
368 
369 enum {
370 	MOXA_BOARD_C218_PCI = 1,
371 	MOXA_BOARD_C218_ISA,
372 	MOXA_BOARD_C320_PCI,
373 	MOXA_BOARD_C320_ISA,
374 	MOXA_BOARD_CP204J,
375 };
376 
377 static char *moxa_brdname[] =
378 {
379 	"C218 Turbo PCI series",
380 	"C218 Turbo ISA series",
381 	"C320 Turbo PCI series",
382 	"C320 Turbo ISA series",
383 	"CP-204J series",
384 };
385 
386 #ifdef CONFIG_PCI
387 static const struct pci_device_id moxa_pcibrds[] = {
388 	{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C218),
389 		.driver_data = MOXA_BOARD_C218_PCI },
390 	{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C320),
391 		.driver_data = MOXA_BOARD_C320_PCI },
392 	{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP204J),
393 		.driver_data = MOXA_BOARD_CP204J },
394 	{ 0 }
395 };
396 MODULE_DEVICE_TABLE(pci, moxa_pcibrds);
397 #endif /* CONFIG_PCI */
398 
399 struct moxa_port;
400 
401 static struct moxa_board_conf {
402 	int boardType;
403 	int numPorts;
404 	int busType;
405 
406 	unsigned int ready;
407 
408 	struct moxa_port *ports;
409 
410 	void __iomem *basemem;
411 	void __iomem *intNdx;
412 	void __iomem *intPend;
413 	void __iomem *intTable;
414 } moxa_boards[MAX_BOARDS];
415 
416 struct mxser_mstatus {
417 	tcflag_t cflag;
418 	int cts;
419 	int dsr;
420 	int ri;
421 	int dcd;
422 };
423 
424 struct moxaq_str {
425 	int inq;
426 	int outq;
427 };
428 
429 struct moxa_port {
430 	struct tty_port port;
431 	struct moxa_board_conf *board;
432 	void __iomem *tableAddr;
433 
434 	int type;
435 	int cflag;
436 	unsigned long statusflags;
437 
438 	u8 DCDState;		/* Protected by the port lock */
439 	u8 lineCtrl;
440 	u8 lowChkFlag;
441 };
442 
443 struct mon_str {
444 	int tick;
445 	int rxcnt[MAX_PORTS];
446 	int txcnt[MAX_PORTS];
447 };
448 
449 /* statusflags */
450 #define TXSTOPPED	1
451 #define LOWWAIT 	2
452 #define EMPTYWAIT	3
453 
454 
455 #define WAKEUP_CHARS		256
456 
457 static int ttymajor = MOXAMAJOR;
458 static struct mon_str moxaLog;
459 static unsigned int moxaFuncTout = HZ / 2;
460 static unsigned int moxaLowWaterChk;
461 static DEFINE_MUTEX(moxa_openlock);
462 static DEFINE_SPINLOCK(moxa_lock);
463 
464 static unsigned long baseaddr[MAX_BOARDS];
465 static unsigned int type[MAX_BOARDS];
466 static unsigned int numports[MAX_BOARDS];
467 static struct tty_port moxa_service_port;
468 
469 MODULE_AUTHOR("William Chen");
470 MODULE_DESCRIPTION("MOXA Intellio Family Multiport Board Device Driver");
471 MODULE_LICENSE("GPL");
472 MODULE_FIRMWARE("c218tunx.cod");
473 MODULE_FIRMWARE("cp204unx.cod");
474 MODULE_FIRMWARE("c320tunx.cod");
475 
476 module_param_array(type, uint, NULL, 0);
477 MODULE_PARM_DESC(type, "card type: C218=2, C320=4");
478 module_param_hw_array(baseaddr, ulong, ioport, NULL, 0);
479 MODULE_PARM_DESC(baseaddr, "base address");
480 module_param_array(numports, uint, NULL, 0);
481 MODULE_PARM_DESC(numports, "numports (ignored for C218)");
482 
483 module_param(ttymajor, int, 0);
484 
485 /*
486  * static functions:
487  */
488 static int moxa_open(struct tty_struct *, struct file *);
489 static void moxa_close(struct tty_struct *, struct file *);
490 static ssize_t moxa_write(struct tty_struct *, const u8 *, size_t);
491 static unsigned int moxa_write_room(struct tty_struct *);
492 static void moxa_flush_buffer(struct tty_struct *);
493 static unsigned int moxa_chars_in_buffer(struct tty_struct *);
494 static void moxa_set_termios(struct tty_struct *, const struct ktermios *);
495 static void moxa_stop(struct tty_struct *);
496 static void moxa_start(struct tty_struct *);
497 static void moxa_hangup(struct tty_struct *);
498 static int moxa_tiocmget(struct tty_struct *tty);
499 static int moxa_tiocmset(struct tty_struct *tty,
500 			 unsigned int set, unsigned int clear);
501 static void moxa_poll(struct timer_list *);
502 static void moxa_set_tty_param(struct tty_struct *, const struct ktermios *);
503 static void moxa_shutdown(struct tty_port *);
504 static bool moxa_carrier_raised(struct tty_port *);
505 static void moxa_dtr_rts(struct tty_port *, bool);
506 /*
507  * moxa board interface functions:
508  */
509 static void MoxaPortEnable(struct moxa_port *);
510 static void MoxaPortDisable(struct moxa_port *);
511 static int MoxaPortSetTermio(struct moxa_port *, struct ktermios *, speed_t);
512 static int MoxaPortGetLineOut(struct moxa_port *, bool *, bool *);
513 static void MoxaPortLineCtrl(struct moxa_port *, bool, bool);
514 static void MoxaPortFlowCtrl(struct moxa_port *, int, int, int, int, int);
515 static int MoxaPortLineStatus(struct moxa_port *);
516 static void MoxaPortFlushData(struct moxa_port *, int);
517 static int MoxaPortWriteData(struct tty_struct *, const unsigned char *, int);
518 static int MoxaPortReadData(struct moxa_port *);
519 static unsigned int MoxaPortTxQueue(struct moxa_port *);
520 static int MoxaPortRxQueue(struct moxa_port *);
521 static unsigned int MoxaPortTxFree(struct moxa_port *);
522 static void MoxaPortTxDisable(struct moxa_port *);
523 static void MoxaPortTxEnable(struct moxa_port *);
524 static int moxa_get_serial_info(struct tty_struct *, struct serial_struct *);
525 static int moxa_set_serial_info(struct tty_struct *, struct serial_struct *);
526 static void MoxaSetFifo(struct moxa_port *port, int enable);
527 
528 /*
529  * I/O functions
530  */
531 
532 static DEFINE_SPINLOCK(moxafunc_lock);
533 
moxa_wait_finish(void __iomem * ofsAddr)534 static void moxa_wait_finish(void __iomem *ofsAddr)
535 {
536 	unsigned long end = jiffies + moxaFuncTout;
537 
538 	while (readw(ofsAddr + FuncCode) != 0)
539 		if (time_after(jiffies, end))
540 			return;
541 	if (readw(ofsAddr + FuncCode) != 0)
542 		printk_ratelimited(KERN_WARNING "moxa function expired\n");
543 }
544 
moxafunc(void __iomem * ofsAddr,u16 cmd,u16 arg)545 static void moxafunc(void __iomem *ofsAddr, u16 cmd, u16 arg)
546 {
547         unsigned long flags;
548         spin_lock_irqsave(&moxafunc_lock, flags);
549 	writew(arg, ofsAddr + FuncArg);
550 	writew(cmd, ofsAddr + FuncCode);
551 	moxa_wait_finish(ofsAddr);
552 	spin_unlock_irqrestore(&moxafunc_lock, flags);
553 }
554 
moxafuncret(void __iomem * ofsAddr,u16 cmd,u16 arg)555 static int moxafuncret(void __iomem *ofsAddr, u16 cmd, u16 arg)
556 {
557         unsigned long flags;
558         u16 ret;
559         spin_lock_irqsave(&moxafunc_lock, flags);
560 	writew(arg, ofsAddr + FuncArg);
561 	writew(cmd, ofsAddr + FuncCode);
562 	moxa_wait_finish(ofsAddr);
563 	ret = readw(ofsAddr + FuncArg);
564 	spin_unlock_irqrestore(&moxafunc_lock, flags);
565 	return ret;
566 }
567 
moxa_low_water_check(void __iomem * ofsAddr)568 static void moxa_low_water_check(void __iomem *ofsAddr)
569 {
570 	u16 rptr, wptr, mask, len;
571 
572 	if (readb(ofsAddr + FlagStat) & Xoff_state) {
573 		rptr = readw(ofsAddr + RXrptr);
574 		wptr = readw(ofsAddr + RXwptr);
575 		mask = readw(ofsAddr + RX_mask);
576 		len = (wptr - rptr) & mask;
577 		if (len <= Low_water)
578 			moxafunc(ofsAddr, FC_SendXon, 0);
579 	}
580 }
581 
582 /*
583  * TTY operations
584  */
585 
moxa_ioctl(struct tty_struct * tty,unsigned int cmd,unsigned long arg)586 static int moxa_ioctl(struct tty_struct *tty,
587 		      unsigned int cmd, unsigned long arg)
588 {
589 	struct moxa_port *ch = tty->driver_data;
590 	void __user *argp = (void __user *)arg;
591 	int status, ret = 0;
592 
593 	if (tty->index == MAX_PORTS) {
594 		if (cmd != MOXA_GETDATACOUNT && cmd != MOXA_GET_IOQUEUE &&
595 				cmd != MOXA_GETMSTATUS)
596 			return -EINVAL;
597 	} else if (!ch)
598 		return -ENODEV;
599 
600 	switch (cmd) {
601 	case MOXA_GETDATACOUNT:
602 		moxaLog.tick = jiffies;
603 		if (copy_to_user(argp, &moxaLog, sizeof(moxaLog)))
604 			ret = -EFAULT;
605 		break;
606 	case MOXA_FLUSH_QUEUE:
607 		MoxaPortFlushData(ch, arg);
608 		break;
609 	case MOXA_GET_IOQUEUE: {
610 		struct moxaq_str __user *argm = argp;
611 		struct moxaq_str tmp;
612 		struct moxa_port *p;
613 		unsigned int i, j;
614 
615 		for (i = 0; i < MAX_BOARDS; i++) {
616 			p = moxa_boards[i].ports;
617 			for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) {
618 				memset(&tmp, 0, sizeof(tmp));
619 				spin_lock_bh(&moxa_lock);
620 				if (moxa_boards[i].ready) {
621 					tmp.inq = MoxaPortRxQueue(p);
622 					tmp.outq = MoxaPortTxQueue(p);
623 				}
624 				spin_unlock_bh(&moxa_lock);
625 				if (copy_to_user(argm, &tmp, sizeof(tmp)))
626 					return -EFAULT;
627 			}
628 		}
629 		break;
630 	} case MOXA_GET_OQUEUE:
631 		status = MoxaPortTxQueue(ch);
632 		ret = put_user(status, (unsigned long __user *)argp);
633 		break;
634 	case MOXA_GET_IQUEUE:
635 		status = MoxaPortRxQueue(ch);
636 		ret = put_user(status, (unsigned long __user *)argp);
637 		break;
638 	case MOXA_GETMSTATUS: {
639 		struct mxser_mstatus __user *argm = argp;
640 		struct mxser_mstatus tmp;
641 		struct moxa_port *p;
642 		unsigned int i, j;
643 
644 		for (i = 0; i < MAX_BOARDS; i++) {
645 			p = moxa_boards[i].ports;
646 			for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) {
647 				struct tty_struct *ttyp;
648 				memset(&tmp, 0, sizeof(tmp));
649 				spin_lock_bh(&moxa_lock);
650 				if (!moxa_boards[i].ready) {
651 				        spin_unlock_bh(&moxa_lock);
652 					goto copy;
653                                 }
654 
655 				status = MoxaPortLineStatus(p);
656 				spin_unlock_bh(&moxa_lock);
657 
658 				if (status & 1)
659 					tmp.cts = 1;
660 				if (status & 2)
661 					tmp.dsr = 1;
662 				if (status & 4)
663 					tmp.dcd = 1;
664 
665 				ttyp = tty_port_tty_get(&p->port);
666 				if (!ttyp)
667 					tmp.cflag = p->cflag;
668 				else
669 					tmp.cflag = ttyp->termios.c_cflag;
670 				tty_kref_put(ttyp);
671 copy:
672 				if (copy_to_user(argm, &tmp, sizeof(tmp)))
673 					return -EFAULT;
674 			}
675 		}
676 		break;
677 	}
678 	default:
679 		ret = -ENOIOCTLCMD;
680 	}
681 	return ret;
682 }
683 
moxa_break_ctl(struct tty_struct * tty,int state)684 static int moxa_break_ctl(struct tty_struct *tty, int state)
685 {
686 	struct moxa_port *port = tty->driver_data;
687 
688 	moxafunc(port->tableAddr, state ? FC_SendBreak : FC_StopBreak,
689 			Magic_code);
690 	return 0;
691 }
692 
693 static const struct tty_operations moxa_ops = {
694 	.open = moxa_open,
695 	.close = moxa_close,
696 	.write = moxa_write,
697 	.write_room = moxa_write_room,
698 	.flush_buffer = moxa_flush_buffer,
699 	.chars_in_buffer = moxa_chars_in_buffer,
700 	.ioctl = moxa_ioctl,
701 	.set_termios = moxa_set_termios,
702 	.stop = moxa_stop,
703 	.start = moxa_start,
704 	.hangup = moxa_hangup,
705 	.break_ctl = moxa_break_ctl,
706 	.tiocmget = moxa_tiocmget,
707 	.tiocmset = moxa_tiocmset,
708 	.set_serial = moxa_set_serial_info,
709 	.get_serial = moxa_get_serial_info,
710 };
711 
712 static const struct tty_port_operations moxa_port_ops = {
713 	.carrier_raised = moxa_carrier_raised,
714 	.dtr_rts = moxa_dtr_rts,
715 	.shutdown = moxa_shutdown,
716 };
717 
718 static struct tty_driver *moxaDriver;
719 static DEFINE_TIMER(moxaTimer, moxa_poll);
720 
721 /*
722  * HW init
723  */
724 
moxa_check_fw_model(struct moxa_board_conf * brd,u8 model)725 static int moxa_check_fw_model(struct moxa_board_conf *brd, u8 model)
726 {
727 	switch (brd->boardType) {
728 	case MOXA_BOARD_C218_ISA:
729 	case MOXA_BOARD_C218_PCI:
730 		if (model != 1)
731 			goto err;
732 		break;
733 	case MOXA_BOARD_CP204J:
734 		if (model != 3)
735 			goto err;
736 		break;
737 	default:
738 		if (model != 2)
739 			goto err;
740 		break;
741 	}
742 	return 0;
743 err:
744 	return -EINVAL;
745 }
746 
moxa_check_fw(const void * ptr)747 static int moxa_check_fw(const void *ptr)
748 {
749 	const __le16 *lptr = ptr;
750 
751 	if (*lptr != cpu_to_le16(0x7980))
752 		return -EINVAL;
753 
754 	return 0;
755 }
756 
moxa_load_bios(struct moxa_board_conf * brd,const u8 * buf,size_t len)757 static int moxa_load_bios(struct moxa_board_conf *brd, const u8 *buf,
758 		size_t len)
759 {
760 	void __iomem *baseAddr = brd->basemem;
761 	u16 tmp;
762 
763 	writeb(HW_reset, baseAddr + Control_reg);	/* reset */
764 	msleep(10);
765 	memset_io(baseAddr, 0, 4096);
766 	memcpy_toio(baseAddr, buf, len);	/* download BIOS */
767 	writeb(0, baseAddr + Control_reg);	/* restart */
768 
769 	msleep(2000);
770 
771 	switch (brd->boardType) {
772 	case MOXA_BOARD_C218_ISA:
773 	case MOXA_BOARD_C218_PCI:
774 		tmp = readw(baseAddr + C218_key);
775 		if (tmp != C218_KeyCode)
776 			goto err;
777 		break;
778 	case MOXA_BOARD_CP204J:
779 		tmp = readw(baseAddr + C218_key);
780 		if (tmp != CP204J_KeyCode)
781 			goto err;
782 		break;
783 	default:
784 		tmp = readw(baseAddr + C320_key);
785 		if (tmp != C320_KeyCode)
786 			goto err;
787 		tmp = readw(baseAddr + C320_status);
788 		if (tmp != STS_init) {
789 			printk(KERN_ERR "MOXA: bios upload failed -- CPU/Basic "
790 					"module not found\n");
791 			return -EIO;
792 		}
793 		break;
794 	}
795 
796 	return 0;
797 err:
798 	printk(KERN_ERR "MOXA: bios upload failed -- board not found\n");
799 	return -EIO;
800 }
801 
moxa_load_320b(struct moxa_board_conf * brd,const u8 * ptr,size_t len)802 static int moxa_load_320b(struct moxa_board_conf *brd, const u8 *ptr,
803 		size_t len)
804 {
805 	void __iomem *baseAddr = brd->basemem;
806 
807 	if (len < 7168) {
808 		printk(KERN_ERR "MOXA: invalid 320 bios -- too short\n");
809 		return -EINVAL;
810 	}
811 
812 	writew(len - 7168 - 2, baseAddr + C320bapi_len);
813 	writeb(1, baseAddr + Control_reg);	/* Select Page 1 */
814 	memcpy_toio(baseAddr + DynPage_addr, ptr, 7168);
815 	writeb(2, baseAddr + Control_reg);	/* Select Page 2 */
816 	memcpy_toio(baseAddr + DynPage_addr, ptr + 7168, len - 7168);
817 
818 	return 0;
819 }
820 
moxa_real_load_code(struct moxa_board_conf * brd,const void * ptr,size_t len)821 static int moxa_real_load_code(struct moxa_board_conf *brd, const void *ptr,
822 		size_t len)
823 {
824 	void __iomem *baseAddr = brd->basemem;
825 	const __le16 *uptr = ptr;
826 	size_t wlen, len2, j;
827 	unsigned long key, loadbuf, loadlen, checksum, checksum_ok;
828 	unsigned int i, retry;
829 	u16 usum, keycode;
830 
831 	keycode = (brd->boardType == MOXA_BOARD_CP204J) ? CP204J_KeyCode :
832 				C218_KeyCode;
833 
834 	switch (brd->boardType) {
835 	case MOXA_BOARD_CP204J:
836 	case MOXA_BOARD_C218_ISA:
837 	case MOXA_BOARD_C218_PCI:
838 		key = C218_key;
839 		loadbuf = C218_LoadBuf;
840 		loadlen = C218DLoad_len;
841 		checksum = C218check_sum;
842 		checksum_ok = C218chksum_ok;
843 		break;
844 	default:
845 		key = C320_key;
846 		keycode = C320_KeyCode;
847 		loadbuf = C320_LoadBuf;
848 		loadlen = C320DLoad_len;
849 		checksum = C320check_sum;
850 		checksum_ok = C320chksum_ok;
851 		break;
852 	}
853 
854 	usum = 0;
855 	wlen = len >> 1;
856 	for (i = 0; i < wlen; i++)
857 		usum += le16_to_cpu(uptr[i]);
858 	retry = 0;
859 	do {
860 		wlen = len >> 1;
861 		j = 0;
862 		while (wlen) {
863 			len2 = (wlen > 2048) ? 2048 : wlen;
864 			wlen -= len2;
865 			memcpy_toio(baseAddr + loadbuf, ptr + j, len2 << 1);
866 			j += len2 << 1;
867 
868 			writew(len2, baseAddr + loadlen);
869 			writew(0, baseAddr + key);
870 			for (i = 0; i < 100; i++) {
871 				if (readw(baseAddr + key) == keycode)
872 					break;
873 				msleep(10);
874 			}
875 			if (readw(baseAddr + key) != keycode)
876 				return -EIO;
877 		}
878 		writew(0, baseAddr + loadlen);
879 		writew(usum, baseAddr + checksum);
880 		writew(0, baseAddr + key);
881 		for (i = 0; i < 100; i++) {
882 			if (readw(baseAddr + key) == keycode)
883 				break;
884 			msleep(10);
885 		}
886 		retry++;
887 	} while ((readb(baseAddr + checksum_ok) != 1) && (retry < 3));
888 	if (readb(baseAddr + checksum_ok) != 1)
889 		return -EIO;
890 
891 	writew(0, baseAddr + key);
892 	for (i = 0; i < 600; i++) {
893 		if (readw(baseAddr + Magic_no) == Magic_code)
894 			break;
895 		msleep(10);
896 	}
897 	if (readw(baseAddr + Magic_no) != Magic_code)
898 		return -EIO;
899 
900 	if (MOXA_IS_320(brd)) {
901 		if (brd->busType == MOXA_BUS_TYPE_PCI) {	/* ASIC board */
902 			writew(0x3800, baseAddr + TMS320_PORT1);
903 			writew(0x3900, baseAddr + TMS320_PORT2);
904 			writew(28499, baseAddr + TMS320_CLOCK);
905 		} else {
906 			writew(0x3200, baseAddr + TMS320_PORT1);
907 			writew(0x3400, baseAddr + TMS320_PORT2);
908 			writew(19999, baseAddr + TMS320_CLOCK);
909 		}
910 	}
911 	writew(1, baseAddr + Disable_IRQ);
912 	writew(0, baseAddr + Magic_no);
913 	for (i = 0; i < 500; i++) {
914 		if (readw(baseAddr + Magic_no) == Magic_code)
915 			break;
916 		msleep(10);
917 	}
918 	if (readw(baseAddr + Magic_no) != Magic_code)
919 		return -EIO;
920 
921 	if (MOXA_IS_320(brd)) {
922 		j = readw(baseAddr + Module_cnt);
923 		if (j <= 0)
924 			return -EIO;
925 		brd->numPorts = j * 8;
926 		writew(j, baseAddr + Module_no);
927 		writew(0, baseAddr + Magic_no);
928 		for (i = 0; i < 600; i++) {
929 			if (readw(baseAddr + Magic_no) == Magic_code)
930 				break;
931 			msleep(10);
932 		}
933 		if (readw(baseAddr + Magic_no) != Magic_code)
934 			return -EIO;
935 	}
936 	brd->intNdx = baseAddr + IRQindex;
937 	brd->intPend = baseAddr + IRQpending;
938 	brd->intTable = baseAddr + IRQtable;
939 
940 	return 0;
941 }
942 
moxa_load_code(struct moxa_board_conf * brd,const void * ptr,size_t len)943 static int moxa_load_code(struct moxa_board_conf *brd, const void *ptr,
944 		size_t len)
945 {
946 	void __iomem *ofsAddr, *baseAddr = brd->basemem;
947 	struct moxa_port *port;
948 	int retval, i;
949 
950 	if (len % 2) {
951 		printk(KERN_ERR "MOXA: bios length is not even\n");
952 		return -EINVAL;
953 	}
954 
955 	retval = moxa_real_load_code(brd, ptr, len); /* may change numPorts */
956 	if (retval)
957 		return retval;
958 
959 	switch (brd->boardType) {
960 	case MOXA_BOARD_C218_ISA:
961 	case MOXA_BOARD_C218_PCI:
962 	case MOXA_BOARD_CP204J:
963 		port = brd->ports;
964 		for (i = 0; i < brd->numPorts; i++, port++) {
965 			port->board = brd;
966 			port->DCDState = 0;
967 			port->tableAddr = baseAddr + Extern_table +
968 					Extern_size * i;
969 			ofsAddr = port->tableAddr;
970 			writew(C218rx_mask, ofsAddr + RX_mask);
971 			writew(C218tx_mask, ofsAddr + TX_mask);
972 			writew(C218rx_spage + i * C218buf_pageno, ofsAddr + Page_rxb);
973 			writew(readw(ofsAddr + Page_rxb) + C218rx_pageno, ofsAddr + EndPage_rxb);
974 
975 			writew(C218tx_spage + i * C218buf_pageno, ofsAddr + Page_txb);
976 			writew(readw(ofsAddr + Page_txb) + C218tx_pageno, ofsAddr + EndPage_txb);
977 
978 		}
979 		break;
980 	default:
981 		port = brd->ports;
982 		for (i = 0; i < brd->numPorts; i++, port++) {
983 			port->board = brd;
984 			port->DCDState = 0;
985 			port->tableAddr = baseAddr + Extern_table +
986 					Extern_size * i;
987 			ofsAddr = port->tableAddr;
988 			switch (brd->numPorts) {
989 			case 8:
990 				writew(C320p8rx_mask, ofsAddr + RX_mask);
991 				writew(C320p8tx_mask, ofsAddr + TX_mask);
992 				writew(C320p8rx_spage + i * C320p8buf_pgno, ofsAddr + Page_rxb);
993 				writew(readw(ofsAddr + Page_rxb) + C320p8rx_pgno, ofsAddr + EndPage_rxb);
994 				writew(C320p8tx_spage + i * C320p8buf_pgno, ofsAddr + Page_txb);
995 				writew(readw(ofsAddr + Page_txb) + C320p8tx_pgno, ofsAddr + EndPage_txb);
996 
997 				break;
998 			case 16:
999 				writew(C320p16rx_mask, ofsAddr + RX_mask);
1000 				writew(C320p16tx_mask, ofsAddr + TX_mask);
1001 				writew(C320p16rx_spage + i * C320p16buf_pgno, ofsAddr + Page_rxb);
1002 				writew(readw(ofsAddr + Page_rxb) + C320p16rx_pgno, ofsAddr + EndPage_rxb);
1003 				writew(C320p16tx_spage + i * C320p16buf_pgno, ofsAddr + Page_txb);
1004 				writew(readw(ofsAddr + Page_txb) + C320p16tx_pgno, ofsAddr + EndPage_txb);
1005 				break;
1006 
1007 			case 24:
1008 				writew(C320p24rx_mask, ofsAddr + RX_mask);
1009 				writew(C320p24tx_mask, ofsAddr + TX_mask);
1010 				writew(C320p24rx_spage + i * C320p24buf_pgno, ofsAddr + Page_rxb);
1011 				writew(readw(ofsAddr + Page_rxb) + C320p24rx_pgno, ofsAddr + EndPage_rxb);
1012 				writew(C320p24tx_spage + i * C320p24buf_pgno, ofsAddr + Page_txb);
1013 				writew(readw(ofsAddr + Page_txb), ofsAddr + EndPage_txb);
1014 				break;
1015 			case 32:
1016 				writew(C320p32rx_mask, ofsAddr + RX_mask);
1017 				writew(C320p32tx_mask, ofsAddr + TX_mask);
1018 				writew(C320p32tx_ofs, ofsAddr + Ofs_txb);
1019 				writew(C320p32rx_spage + i * C320p32buf_pgno, ofsAddr + Page_rxb);
1020 				writew(readb(ofsAddr + Page_rxb), ofsAddr + EndPage_rxb);
1021 				writew(C320p32tx_spage + i * C320p32buf_pgno, ofsAddr + Page_txb);
1022 				writew(readw(ofsAddr + Page_txb), ofsAddr + EndPage_txb);
1023 				break;
1024 			}
1025 		}
1026 		break;
1027 	}
1028 	return 0;
1029 }
1030 
moxa_load_fw(struct moxa_board_conf * brd,const struct firmware * fw)1031 static int moxa_load_fw(struct moxa_board_conf *brd, const struct firmware *fw)
1032 {
1033 	const void *ptr = fw->data;
1034 	char rsn[64];
1035 	u16 lens[5];
1036 	size_t len;
1037 	unsigned int a, lenp, lencnt;
1038 	int ret = -EINVAL;
1039 	struct {
1040 		__le32 magic;	/* 0x34303430 */
1041 		u8 reserved1[2];
1042 		u8 type;	/* UNIX = 3 */
1043 		u8 model;	/* C218T=1, C320T=2, CP204=3 */
1044 		u8 reserved2[8];
1045 		__le16 len[5];
1046 	} const *hdr = ptr;
1047 
1048 	BUILD_BUG_ON(ARRAY_SIZE(hdr->len) != ARRAY_SIZE(lens));
1049 
1050 	if (fw->size < MOXA_FW_HDRLEN) {
1051 		strcpy(rsn, "too short (even header won't fit)");
1052 		goto err;
1053 	}
1054 	if (hdr->magic != cpu_to_le32(0x30343034)) {
1055 		sprintf(rsn, "bad magic: %.8x", le32_to_cpu(hdr->magic));
1056 		goto err;
1057 	}
1058 	if (hdr->type != 3) {
1059 		sprintf(rsn, "not for linux, type is %u", hdr->type);
1060 		goto err;
1061 	}
1062 	if (moxa_check_fw_model(brd, hdr->model)) {
1063 		sprintf(rsn, "not for this card, model is %u", hdr->model);
1064 		goto err;
1065 	}
1066 
1067 	len = MOXA_FW_HDRLEN;
1068 	lencnt = hdr->model == 2 ? 5 : 3;
1069 	for (a = 0; a < ARRAY_SIZE(lens); a++) {
1070 		lens[a] = le16_to_cpu(hdr->len[a]);
1071 		if (lens[a] && len + lens[a] <= fw->size &&
1072 				moxa_check_fw(&fw->data[len]))
1073 			printk(KERN_WARNING "MOXA firmware: unexpected input "
1074 				"at offset %u, but going on\n", (u32)len);
1075 		if (!lens[a] && a < lencnt) {
1076 			sprintf(rsn, "too few entries in fw file");
1077 			goto err;
1078 		}
1079 		len += lens[a];
1080 	}
1081 
1082 	if (len != fw->size) {
1083 		sprintf(rsn, "bad length: %u (should be %u)", (u32)fw->size,
1084 				(u32)len);
1085 		goto err;
1086 	}
1087 
1088 	ptr += MOXA_FW_HDRLEN;
1089 	lenp = 0; /* bios */
1090 
1091 	strcpy(rsn, "read above");
1092 
1093 	ret = moxa_load_bios(brd, ptr, lens[lenp]);
1094 	if (ret)
1095 		goto err;
1096 
1097 	/* we skip the tty section (lens[1]), since we don't need it */
1098 	ptr += lens[lenp] + lens[lenp + 1];
1099 	lenp += 2; /* comm */
1100 
1101 	if (hdr->model == 2) {
1102 		ret = moxa_load_320b(brd, ptr, lens[lenp]);
1103 		if (ret)
1104 			goto err;
1105 		/* skip another tty */
1106 		ptr += lens[lenp] + lens[lenp + 1];
1107 		lenp += 2;
1108 	}
1109 
1110 	ret = moxa_load_code(brd, ptr, lens[lenp]);
1111 	if (ret)
1112 		goto err;
1113 
1114 	return 0;
1115 err:
1116 	printk(KERN_ERR "firmware failed to load, reason: %s\n", rsn);
1117 	return ret;
1118 }
1119 
moxa_init_board(struct moxa_board_conf * brd,struct device * dev)1120 static int moxa_init_board(struct moxa_board_conf *brd, struct device *dev)
1121 {
1122 	const struct firmware *fw;
1123 	const char *file;
1124 	struct moxa_port *p;
1125 	unsigned int i, first_idx;
1126 	int ret;
1127 
1128 	brd->ports = kcalloc(MAX_PORTS_PER_BOARD, sizeof(*brd->ports),
1129 			GFP_KERNEL);
1130 	if (brd->ports == NULL) {
1131 		printk(KERN_ERR "cannot allocate memory for ports\n");
1132 		ret = -ENOMEM;
1133 		goto err;
1134 	}
1135 
1136 	for (i = 0, p = brd->ports; i < MAX_PORTS_PER_BOARD; i++, p++) {
1137 		tty_port_init(&p->port);
1138 		p->port.ops = &moxa_port_ops;
1139 		p->type = PORT_16550A;
1140 		p->cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
1141 	}
1142 
1143 	switch (brd->boardType) {
1144 	case MOXA_BOARD_C218_ISA:
1145 	case MOXA_BOARD_C218_PCI:
1146 		file = "c218tunx.cod";
1147 		break;
1148 	case MOXA_BOARD_CP204J:
1149 		file = "cp204unx.cod";
1150 		break;
1151 	default:
1152 		file = "c320tunx.cod";
1153 		break;
1154 	}
1155 
1156 	ret = request_firmware(&fw, file, dev);
1157 	if (ret) {
1158 		printk(KERN_ERR "MOXA: request_firmware failed. Make sure "
1159 				"you've placed '%s' file into your firmware "
1160 				"loader directory (e.g. /lib/firmware)\n",
1161 				file);
1162 		goto err_free;
1163 	}
1164 
1165 	ret = moxa_load_fw(brd, fw);
1166 
1167 	release_firmware(fw);
1168 
1169 	if (ret)
1170 		goto err_free;
1171 
1172 	spin_lock_bh(&moxa_lock);
1173 	brd->ready = 1;
1174 	if (!timer_pending(&moxaTimer))
1175 		mod_timer(&moxaTimer, jiffies + HZ / 50);
1176 	spin_unlock_bh(&moxa_lock);
1177 
1178 	first_idx = (brd - moxa_boards) * MAX_PORTS_PER_BOARD;
1179 	for (i = 0; i < brd->numPorts; i++)
1180 		tty_port_register_device(&brd->ports[i].port, moxaDriver,
1181 				first_idx + i, dev);
1182 
1183 	return 0;
1184 err_free:
1185 	for (i = 0; i < MAX_PORTS_PER_BOARD; i++)
1186 		tty_port_destroy(&brd->ports[i].port);
1187 	kfree(brd->ports);
1188 err:
1189 	return ret;
1190 }
1191 
moxa_board_deinit(struct moxa_board_conf * brd)1192 static void moxa_board_deinit(struct moxa_board_conf *brd)
1193 {
1194 	unsigned int a, opened, first_idx;
1195 
1196 	mutex_lock(&moxa_openlock);
1197 	spin_lock_bh(&moxa_lock);
1198 	brd->ready = 0;
1199 	spin_unlock_bh(&moxa_lock);
1200 
1201 	/* pci hot-un-plug support */
1202 	for (a = 0; a < brd->numPorts; a++)
1203 		if (tty_port_initialized(&brd->ports[a].port))
1204 			tty_port_tty_hangup(&brd->ports[a].port, false);
1205 
1206 	for (a = 0; a < MAX_PORTS_PER_BOARD; a++)
1207 		tty_port_destroy(&brd->ports[a].port);
1208 
1209 	while (1) {
1210 		opened = 0;
1211 		for (a = 0; a < brd->numPorts; a++)
1212 			if (tty_port_initialized(&brd->ports[a].port))
1213 				opened++;
1214 		mutex_unlock(&moxa_openlock);
1215 		if (!opened)
1216 			break;
1217 		msleep(50);
1218 		mutex_lock(&moxa_openlock);
1219 	}
1220 
1221 	first_idx = (brd - moxa_boards) * MAX_PORTS_PER_BOARD;
1222 	for (a = 0; a < brd->numPorts; a++)
1223 		tty_unregister_device(moxaDriver, first_idx + a);
1224 
1225 	iounmap(brd->basemem);
1226 	brd->basemem = NULL;
1227 	kfree(brd->ports);
1228 }
1229 
1230 #ifdef CONFIG_PCI
moxa_pci_probe(struct pci_dev * pdev,const struct pci_device_id * ent)1231 static int moxa_pci_probe(struct pci_dev *pdev,
1232 		const struct pci_device_id *ent)
1233 {
1234 	struct moxa_board_conf *board;
1235 	unsigned int i;
1236 	int board_type = ent->driver_data;
1237 	int retval;
1238 
1239 	retval = pci_enable_device(pdev);
1240 	if (retval) {
1241 		dev_err(&pdev->dev, "can't enable pci device\n");
1242 		goto err;
1243 	}
1244 
1245 	for (i = 0; i < MAX_BOARDS; i++)
1246 		if (moxa_boards[i].basemem == NULL)
1247 			break;
1248 
1249 	retval = -ENODEV;
1250 	if (i >= MAX_BOARDS) {
1251 		dev_warn(&pdev->dev, "more than %u MOXA Intellio family boards "
1252 				"found. Board is ignored.\n", MAX_BOARDS);
1253 		goto err;
1254 	}
1255 
1256 	board = &moxa_boards[i];
1257 
1258 	retval = pci_request_region(pdev, 2, "moxa-base");
1259 	if (retval) {
1260 		dev_err(&pdev->dev, "can't request pci region 2\n");
1261 		goto err;
1262 	}
1263 
1264 	board->basemem = ioremap(pci_resource_start(pdev, 2), 0x4000);
1265 	if (board->basemem == NULL) {
1266 		dev_err(&pdev->dev, "can't remap io space 2\n");
1267 		retval = -ENOMEM;
1268 		goto err_reg;
1269 	}
1270 
1271 	board->boardType = board_type;
1272 	switch (board_type) {
1273 	case MOXA_BOARD_C218_ISA:
1274 	case MOXA_BOARD_C218_PCI:
1275 		board->numPorts = 8;
1276 		break;
1277 
1278 	case MOXA_BOARD_CP204J:
1279 		board->numPorts = 4;
1280 		break;
1281 	default:
1282 		board->numPorts = 0;
1283 		break;
1284 	}
1285 	board->busType = MOXA_BUS_TYPE_PCI;
1286 
1287 	retval = moxa_init_board(board, &pdev->dev);
1288 	if (retval)
1289 		goto err_base;
1290 
1291 	pci_set_drvdata(pdev, board);
1292 
1293 	dev_info(&pdev->dev, "board '%s' ready (%u ports, firmware loaded)\n",
1294 			moxa_brdname[board_type - 1], board->numPorts);
1295 
1296 	return 0;
1297 err_base:
1298 	iounmap(board->basemem);
1299 	board->basemem = NULL;
1300 err_reg:
1301 	pci_release_region(pdev, 2);
1302 err:
1303 	return retval;
1304 }
1305 
moxa_pci_remove(struct pci_dev * pdev)1306 static void moxa_pci_remove(struct pci_dev *pdev)
1307 {
1308 	struct moxa_board_conf *brd = pci_get_drvdata(pdev);
1309 
1310 	moxa_board_deinit(brd);
1311 
1312 	pci_release_region(pdev, 2);
1313 }
1314 
1315 static struct pci_driver moxa_pci_driver = {
1316 	.name = "moxa",
1317 	.id_table = moxa_pcibrds,
1318 	.probe = moxa_pci_probe,
1319 	.remove = moxa_pci_remove
1320 };
1321 #endif /* CONFIG_PCI */
1322 
moxa_init(void)1323 static int __init moxa_init(void)
1324 {
1325 	unsigned int isabrds = 0;
1326 	int retval = 0;
1327 	struct moxa_board_conf *brd = moxa_boards;
1328 	unsigned int i;
1329 
1330 	printk(KERN_INFO "MOXA Intellio family driver version %s\n",
1331 			MOXA_VERSION);
1332 
1333 	tty_port_init(&moxa_service_port);
1334 
1335 	moxaDriver = tty_alloc_driver(MAX_PORTS + 1,
1336 			TTY_DRIVER_REAL_RAW |
1337 			TTY_DRIVER_DYNAMIC_DEV);
1338 	if (IS_ERR(moxaDriver))
1339 		return PTR_ERR(moxaDriver);
1340 
1341 	moxaDriver->name = "ttyMX";
1342 	moxaDriver->major = ttymajor;
1343 	moxaDriver->minor_start = 0;
1344 	moxaDriver->type = TTY_DRIVER_TYPE_SERIAL;
1345 	moxaDriver->subtype = SERIAL_TYPE_NORMAL;
1346 	moxaDriver->init_termios = tty_std_termios;
1347 	moxaDriver->init_termios.c_cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
1348 	moxaDriver->init_termios.c_ispeed = 9600;
1349 	moxaDriver->init_termios.c_ospeed = 9600;
1350 	tty_set_operations(moxaDriver, &moxa_ops);
1351 	/* Having one more port only for ioctls is ugly */
1352 	tty_port_link_device(&moxa_service_port, moxaDriver, MAX_PORTS);
1353 
1354 	if (tty_register_driver(moxaDriver)) {
1355 		printk(KERN_ERR "can't register MOXA Smartio tty driver!\n");
1356 		tty_driver_kref_put(moxaDriver);
1357 		return -1;
1358 	}
1359 
1360 	/* Find the boards defined from module args. */
1361 
1362 	for (i = 0; i < MAX_BOARDS; i++) {
1363 		if (!baseaddr[i])
1364 			break;
1365 		if (type[i] == MOXA_BOARD_C218_ISA ||
1366 				type[i] == MOXA_BOARD_C320_ISA) {
1367 			pr_debug("Moxa board %2d: %s board(baseAddr=%lx)\n",
1368 					isabrds + 1, moxa_brdname[type[i] - 1],
1369 					baseaddr[i]);
1370 			brd->boardType = type[i];
1371 			brd->numPorts = type[i] == MOXA_BOARD_C218_ISA ? 8 :
1372 					numports[i];
1373 			brd->busType = MOXA_BUS_TYPE_ISA;
1374 			brd->basemem = ioremap(baseaddr[i], 0x4000);
1375 			if (!brd->basemem) {
1376 				printk(KERN_ERR "MOXA: can't remap %lx\n",
1377 						baseaddr[i]);
1378 				continue;
1379 			}
1380 			if (moxa_init_board(brd, NULL)) {
1381 				iounmap(brd->basemem);
1382 				brd->basemem = NULL;
1383 				continue;
1384 			}
1385 
1386 			printk(KERN_INFO "MOXA isa board found at 0x%.8lx and "
1387 					"ready (%u ports, firmware loaded)\n",
1388 					baseaddr[i], brd->numPorts);
1389 
1390 			brd++;
1391 			isabrds++;
1392 		}
1393 	}
1394 
1395 #ifdef CONFIG_PCI
1396 	retval = pci_register_driver(&moxa_pci_driver);
1397 	if (retval) {
1398 		printk(KERN_ERR "Can't register MOXA pci driver!\n");
1399 		if (isabrds)
1400 			retval = 0;
1401 	}
1402 #endif
1403 
1404 	return retval;
1405 }
1406 
moxa_exit(void)1407 static void __exit moxa_exit(void)
1408 {
1409 	unsigned int i;
1410 
1411 #ifdef CONFIG_PCI
1412 	pci_unregister_driver(&moxa_pci_driver);
1413 #endif
1414 
1415 	for (i = 0; i < MAX_BOARDS; i++) /* ISA boards */
1416 		if (moxa_boards[i].ready)
1417 			moxa_board_deinit(&moxa_boards[i]);
1418 
1419 	del_timer_sync(&moxaTimer);
1420 
1421 	tty_unregister_driver(moxaDriver);
1422 	tty_driver_kref_put(moxaDriver);
1423 }
1424 
1425 module_init(moxa_init);
1426 module_exit(moxa_exit);
1427 
moxa_shutdown(struct tty_port * port)1428 static void moxa_shutdown(struct tty_port *port)
1429 {
1430 	struct moxa_port *ch = container_of(port, struct moxa_port, port);
1431         MoxaPortDisable(ch);
1432 	MoxaPortFlushData(ch, 2);
1433 }
1434 
moxa_carrier_raised(struct tty_port * port)1435 static bool moxa_carrier_raised(struct tty_port *port)
1436 {
1437 	struct moxa_port *ch = container_of(port, struct moxa_port, port);
1438 	int dcd;
1439 
1440 	spin_lock_irq(&port->lock);
1441 	dcd = ch->DCDState;
1442 	spin_unlock_irq(&port->lock);
1443 	return dcd;
1444 }
1445 
moxa_dtr_rts(struct tty_port * port,bool active)1446 static void moxa_dtr_rts(struct tty_port *port, bool active)
1447 {
1448 	struct moxa_port *ch = container_of(port, struct moxa_port, port);
1449 	MoxaPortLineCtrl(ch, active, active);
1450 }
1451 
1452 
moxa_open(struct tty_struct * tty,struct file * filp)1453 static int moxa_open(struct tty_struct *tty, struct file *filp)
1454 {
1455 	struct moxa_board_conf *brd;
1456 	struct moxa_port *ch;
1457 	int port;
1458 
1459 	port = tty->index;
1460 	if (port == MAX_PORTS) {
1461 		return capable(CAP_SYS_ADMIN) ? 0 : -EPERM;
1462 	}
1463 	if (mutex_lock_interruptible(&moxa_openlock))
1464 		return -ERESTARTSYS;
1465 	brd = &moxa_boards[port / MAX_PORTS_PER_BOARD];
1466 	if (!brd->ready) {
1467 		mutex_unlock(&moxa_openlock);
1468 		return -ENODEV;
1469 	}
1470 
1471 	if (port % MAX_PORTS_PER_BOARD >= brd->numPorts) {
1472 		mutex_unlock(&moxa_openlock);
1473 		return -ENODEV;
1474 	}
1475 
1476 	ch = &brd->ports[port % MAX_PORTS_PER_BOARD];
1477 	ch->port.count++;
1478 	tty->driver_data = ch;
1479 	tty_port_tty_set(&ch->port, tty);
1480 	mutex_lock(&ch->port.mutex);
1481 	if (!tty_port_initialized(&ch->port)) {
1482 		ch->statusflags = 0;
1483 		moxa_set_tty_param(tty, &tty->termios);
1484 		MoxaPortLineCtrl(ch, true, true);
1485 		MoxaPortEnable(ch);
1486 		MoxaSetFifo(ch, ch->type == PORT_16550A);
1487 		tty_port_set_initialized(&ch->port, true);
1488 	}
1489 	mutex_unlock(&ch->port.mutex);
1490 	mutex_unlock(&moxa_openlock);
1491 
1492 	return tty_port_block_til_ready(&ch->port, tty, filp);
1493 }
1494 
moxa_close(struct tty_struct * tty,struct file * filp)1495 static void moxa_close(struct tty_struct *tty, struct file *filp)
1496 {
1497 	struct moxa_port *ch = tty->driver_data;
1498 	ch->cflag = tty->termios.c_cflag;
1499 	tty_port_close(&ch->port, tty, filp);
1500 }
1501 
moxa_write(struct tty_struct * tty,const u8 * buf,size_t count)1502 static ssize_t moxa_write(struct tty_struct *tty, const u8 *buf, size_t count)
1503 {
1504 	struct moxa_port *ch = tty->driver_data;
1505 	unsigned long flags;
1506 	int len;
1507 
1508 	if (ch == NULL)
1509 		return 0;
1510 
1511 	spin_lock_irqsave(&moxa_lock, flags);
1512 	len = MoxaPortWriteData(tty, buf, count);
1513 	spin_unlock_irqrestore(&moxa_lock, flags);
1514 
1515 	set_bit(LOWWAIT, &ch->statusflags);
1516 	return len;
1517 }
1518 
moxa_write_room(struct tty_struct * tty)1519 static unsigned int moxa_write_room(struct tty_struct *tty)
1520 {
1521 	struct moxa_port *ch;
1522 
1523 	if (tty->flow.stopped)
1524 		return 0;
1525 	ch = tty->driver_data;
1526 	if (ch == NULL)
1527 		return 0;
1528 	return MoxaPortTxFree(ch);
1529 }
1530 
moxa_flush_buffer(struct tty_struct * tty)1531 static void moxa_flush_buffer(struct tty_struct *tty)
1532 {
1533 	struct moxa_port *ch = tty->driver_data;
1534 
1535 	if (ch == NULL)
1536 		return;
1537 	MoxaPortFlushData(ch, 1);
1538 	tty_wakeup(tty);
1539 }
1540 
moxa_chars_in_buffer(struct tty_struct * tty)1541 static unsigned int moxa_chars_in_buffer(struct tty_struct *tty)
1542 {
1543 	struct moxa_port *ch = tty->driver_data;
1544 	unsigned int chars;
1545 
1546 	chars = MoxaPortTxQueue(ch);
1547 	if (chars)
1548 		/*
1549 		 * Make it possible to wakeup anything waiting for output
1550 		 * in tty_ioctl.c, etc.
1551 		 */
1552         	set_bit(EMPTYWAIT, &ch->statusflags);
1553 	return chars;
1554 }
1555 
moxa_tiocmget(struct tty_struct * tty)1556 static int moxa_tiocmget(struct tty_struct *tty)
1557 {
1558 	struct moxa_port *ch = tty->driver_data;
1559 	bool dtr_active, rts_active;
1560 	int flag = 0;
1561 	int status;
1562 
1563 	MoxaPortGetLineOut(ch, &dtr_active, &rts_active);
1564 	if (dtr_active)
1565 		flag |= TIOCM_DTR;
1566 	if (rts_active)
1567 		flag |= TIOCM_RTS;
1568 	status = MoxaPortLineStatus(ch);
1569 	if (status & 1)
1570 		flag |= TIOCM_CTS;
1571 	if (status & 2)
1572 		flag |= TIOCM_DSR;
1573 	if (status & 4)
1574 		flag |= TIOCM_CD;
1575 	return flag;
1576 }
1577 
moxa_tiocmset(struct tty_struct * tty,unsigned int set,unsigned int clear)1578 static int moxa_tiocmset(struct tty_struct *tty,
1579 			 unsigned int set, unsigned int clear)
1580 {
1581 	bool dtr_active, rts_active;
1582 	struct moxa_port *ch;
1583 
1584 	mutex_lock(&moxa_openlock);
1585 	ch = tty->driver_data;
1586 	if (!ch) {
1587 		mutex_unlock(&moxa_openlock);
1588 		return -EINVAL;
1589 	}
1590 
1591 	MoxaPortGetLineOut(ch, &dtr_active, &rts_active);
1592 	if (set & TIOCM_RTS)
1593 		rts_active = true;
1594 	if (set & TIOCM_DTR)
1595 		dtr_active = true;
1596 	if (clear & TIOCM_RTS)
1597 		rts_active = false;
1598 	if (clear & TIOCM_DTR)
1599 		dtr_active = false;
1600 	MoxaPortLineCtrl(ch, dtr_active, rts_active);
1601 	mutex_unlock(&moxa_openlock);
1602 	return 0;
1603 }
1604 
moxa_set_termios(struct tty_struct * tty,const struct ktermios * old_termios)1605 static void moxa_set_termios(struct tty_struct *tty,
1606 		             const struct ktermios *old_termios)
1607 {
1608 	struct moxa_port *ch = tty->driver_data;
1609 
1610 	if (ch == NULL)
1611 		return;
1612 	moxa_set_tty_param(tty, old_termios);
1613 	if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty))
1614 		wake_up_interruptible(&ch->port.open_wait);
1615 }
1616 
moxa_stop(struct tty_struct * tty)1617 static void moxa_stop(struct tty_struct *tty)
1618 {
1619 	struct moxa_port *ch = tty->driver_data;
1620 
1621 	if (ch == NULL)
1622 		return;
1623 	MoxaPortTxDisable(ch);
1624 	set_bit(TXSTOPPED, &ch->statusflags);
1625 }
1626 
1627 
moxa_start(struct tty_struct * tty)1628 static void moxa_start(struct tty_struct *tty)
1629 {
1630 	struct moxa_port *ch = tty->driver_data;
1631 
1632 	if (ch == NULL)
1633 		return;
1634 
1635 	if (!test_bit(TXSTOPPED, &ch->statusflags))
1636 		return;
1637 
1638 	MoxaPortTxEnable(ch);
1639 	clear_bit(TXSTOPPED, &ch->statusflags);
1640 }
1641 
moxa_hangup(struct tty_struct * tty)1642 static void moxa_hangup(struct tty_struct *tty)
1643 {
1644 	struct moxa_port *ch = tty->driver_data;
1645 	tty_port_hangup(&ch->port);
1646 }
1647 
moxa_new_dcdstate(struct moxa_port * p,u8 dcd)1648 static void moxa_new_dcdstate(struct moxa_port *p, u8 dcd)
1649 {
1650 	unsigned long flags;
1651 	dcd = !!dcd;
1652 
1653 	spin_lock_irqsave(&p->port.lock, flags);
1654 	if (dcd != p->DCDState) {
1655         	p->DCDState = dcd;
1656         	spin_unlock_irqrestore(&p->port.lock, flags);
1657 		if (!dcd)
1658 			tty_port_tty_hangup(&p->port, true);
1659 	}
1660 	else
1661 		spin_unlock_irqrestore(&p->port.lock, flags);
1662 }
1663 
moxa_poll_port(struct moxa_port * p,unsigned int handle,u16 __iomem * ip)1664 static int moxa_poll_port(struct moxa_port *p, unsigned int handle,
1665 		u16 __iomem *ip)
1666 {
1667 	struct tty_struct *tty = tty_port_tty_get(&p->port);
1668 	bool inited = tty_port_initialized(&p->port);
1669 	void __iomem *ofsAddr;
1670 	u16 intr;
1671 
1672 	if (tty) {
1673 		if (test_bit(EMPTYWAIT, &p->statusflags) &&
1674 				MoxaPortTxQueue(p) == 0) {
1675 			clear_bit(EMPTYWAIT, &p->statusflags);
1676 			tty_wakeup(tty);
1677 		}
1678 		if (test_bit(LOWWAIT, &p->statusflags) && !tty->flow.stopped &&
1679 				MoxaPortTxQueue(p) <= WAKEUP_CHARS) {
1680 			clear_bit(LOWWAIT, &p->statusflags);
1681 			tty_wakeup(tty);
1682 		}
1683 
1684 		if (inited && !tty_throttled(tty) &&
1685 				MoxaPortRxQueue(p) > 0) { /* RX */
1686 			MoxaPortReadData(p);
1687 			tty_flip_buffer_push(&p->port);
1688 		}
1689 	} else {
1690 		clear_bit(EMPTYWAIT, &p->statusflags);
1691 		MoxaPortFlushData(p, 0); /* flush RX */
1692 	}
1693 
1694 	if (!handle) /* nothing else to do */
1695 		goto put;
1696 
1697 	intr = readw(ip); /* port irq status */
1698 	if (intr == 0)
1699 		goto put;
1700 
1701 	writew(0, ip); /* ACK port */
1702 	ofsAddr = p->tableAddr;
1703 	if (intr & IntrTx) /* disable tx intr */
1704 		writew(readw(ofsAddr + HostStat) & ~WakeupTx,
1705 				ofsAddr + HostStat);
1706 
1707 	if (!inited)
1708 		goto put;
1709 
1710 	if (tty && (intr & IntrBreak) && !I_IGNBRK(tty)) { /* BREAK */
1711 		tty_insert_flip_char(&p->port, 0, TTY_BREAK);
1712 		tty_flip_buffer_push(&p->port);
1713 	}
1714 
1715 	if (intr & IntrLine)
1716 		moxa_new_dcdstate(p, readb(ofsAddr + FlagStat) & DCD_state);
1717 put:
1718 	tty_kref_put(tty);
1719 
1720 	return 0;
1721 }
1722 
moxa_poll(struct timer_list * unused)1723 static void moxa_poll(struct timer_list *unused)
1724 {
1725 	struct moxa_board_conf *brd;
1726 	u16 __iomem *ip;
1727 	unsigned int card, port, served = 0;
1728 
1729 	spin_lock(&moxa_lock);
1730 	for (card = 0; card < MAX_BOARDS; card++) {
1731 		brd = &moxa_boards[card];
1732 		if (!brd->ready)
1733 			continue;
1734 
1735 		served++;
1736 
1737 		ip = NULL;
1738 		if (readb(brd->intPend) == 0xff)
1739 			ip = brd->intTable + readb(brd->intNdx);
1740 
1741 		for (port = 0; port < brd->numPorts; port++)
1742 			moxa_poll_port(&brd->ports[port], !!ip, ip + port);
1743 
1744 		if (ip)
1745 			writeb(0, brd->intPend); /* ACK */
1746 
1747 		if (moxaLowWaterChk) {
1748 			struct moxa_port *p = brd->ports;
1749 			for (port = 0; port < brd->numPorts; port++, p++)
1750 				if (p->lowChkFlag) {
1751 					p->lowChkFlag = 0;
1752 					moxa_low_water_check(p->tableAddr);
1753 				}
1754 		}
1755 	}
1756 	moxaLowWaterChk = 0;
1757 
1758 	if (served)
1759 		mod_timer(&moxaTimer, jiffies + HZ / 50);
1760 	spin_unlock(&moxa_lock);
1761 }
1762 
1763 /******************************************************************************/
1764 
moxa_set_tty_param(struct tty_struct * tty,const struct ktermios * old_termios)1765 static void moxa_set_tty_param(struct tty_struct *tty,
1766 			       const struct ktermios *old_termios)
1767 {
1768 	register struct ktermios *ts = &tty->termios;
1769 	struct moxa_port *ch = tty->driver_data;
1770 	int rts, cts, txflow, rxflow, xany, baud;
1771 
1772 	rts = cts = txflow = rxflow = xany = 0;
1773 	if (ts->c_cflag & CRTSCTS)
1774 		rts = cts = 1;
1775 	if (ts->c_iflag & IXON)
1776 		txflow = 1;
1777 	if (ts->c_iflag & IXOFF)
1778 		rxflow = 1;
1779 	if (ts->c_iflag & IXANY)
1780 		xany = 1;
1781 
1782 	MoxaPortFlowCtrl(ch, rts, cts, txflow, rxflow, xany);
1783 	baud = MoxaPortSetTermio(ch, ts, tty_get_baud_rate(tty));
1784 	if (baud == -1)
1785 		baud = tty_termios_baud_rate(old_termios);
1786 	/* Not put the baud rate into the termios data */
1787 	tty_encode_baud_rate(tty, baud, baud);
1788 }
1789 
1790 /*****************************************************************************
1791  *	Driver level functions: 					     *
1792  *****************************************************************************/
1793 
MoxaPortFlushData(struct moxa_port * port,int mode)1794 static void MoxaPortFlushData(struct moxa_port *port, int mode)
1795 {
1796 	void __iomem *ofsAddr;
1797 	if (mode < 0 || mode > 2)
1798 		return;
1799 	ofsAddr = port->tableAddr;
1800 	moxafunc(ofsAddr, FC_FlushQueue, mode);
1801 	if (mode != 1) {
1802 		port->lowChkFlag = 0;
1803 		moxa_low_water_check(ofsAddr);
1804 	}
1805 }
1806 
1807 /*
1808  *    Moxa Port Number Description:
1809  *
1810  *      MOXA serial driver supports up to 4 MOXA-C218/C320 boards. And,
1811  *      the port number using in MOXA driver functions will be 0 to 31 for
1812  *      first MOXA board, 32 to 63 for second, 64 to 95 for third and 96
1813  *      to 127 for fourth. For example, if you setup three MOXA boards,
1814  *      first board is C218, second board is C320-16 and third board is
1815  *      C320-32. The port number of first board (C218 - 8 ports) is from
1816  *      0 to 7. The port number of second board (C320 - 16 ports) is form
1817  *      32 to 47. The port number of third board (C320 - 32 ports) is from
1818  *      64 to 95. And those port numbers form 8 to 31, 48 to 63 and 96 to
1819  *      127 will be invalid.
1820  *
1821  *
1822  *      Moxa Functions Description:
1823  *
1824  *      Function 1:     Driver initialization routine, this routine must be
1825  *                      called when initialized driver.
1826  *      Syntax:
1827  *      void MoxaDriverInit();
1828  *
1829  *
1830  *      Function 2:     Moxa driver private IOCTL command processing.
1831  *      Syntax:
1832  *      int  MoxaDriverIoctl(unsigned int cmd, unsigned long arg, int port);
1833  *
1834  *           unsigned int cmd   : IOCTL command
1835  *           unsigned long arg  : IOCTL argument
1836  *           int port           : port number (0 - 127)
1837  *
1838  *           return:    0  (OK)
1839  *                      -EINVAL
1840  *                      -ENOIOCTLCMD
1841  *
1842  *
1843  *      Function 6:     Enable this port to start Tx/Rx data.
1844  *      Syntax:
1845  *      void MoxaPortEnable(int port);
1846  *           int port           : port number (0 - 127)
1847  *
1848  *
1849  *      Function 7:     Disable this port
1850  *      Syntax:
1851  *      void MoxaPortDisable(int port);
1852  *           int port           : port number (0 - 127)
1853  *
1854  *
1855  *      Function 10:    Setting baud rate of this port.
1856  *      Syntax:
1857  *      speed_t MoxaPortSetBaud(int port, speed_t baud);
1858  *           int port           : port number (0 - 127)
1859  *           long baud          : baud rate (50 - 115200)
1860  *
1861  *           return:    0       : this port is invalid or baud < 50
1862  *                      50 - 115200 : the real baud rate set to the port, if
1863  *                                    the argument baud is large than maximun
1864  *                                    available baud rate, the real setting
1865  *                                    baud rate will be the maximun baud rate.
1866  *
1867  *
1868  *      Function 12:    Configure the port.
1869  *      Syntax:
1870  *      int  MoxaPortSetTermio(int port, struct ktermios *termio, speed_t baud);
1871  *           int port           : port number (0 - 127)
1872  *           struct ktermios * termio : termio structure pointer
1873  *	     speed_t baud	: baud rate
1874  *
1875  *           return:    -1      : this port is invalid or termio == NULL
1876  *                      0       : setting O.K.
1877  *
1878  *
1879  *      Function 13:    Get the DTR/RTS state of this port.
1880  *      Syntax:
1881  *      int  MoxaPortGetLineOut(int port, bool *dtrState, bool *rtsState);
1882  *           int port           : port number (0 - 127)
1883  *           bool * dtr_active  : pointer to bool to receive the current DTR
1884  *                                state. (if NULL, this function will not
1885  *                                write to this address)
1886  *           bool * rts_active  : pointer to bool to receive the current RTS
1887  *                                state. (if NULL, this function will not
1888  *                                write to this address)
1889  *
1890  *           return:    -1      : this port is invalid
1891  *                      0       : O.K.
1892  *
1893  *
1894  *      Function 14:    Setting the DTR/RTS output state of this port.
1895  *      Syntax:
1896  *      void MoxaPortLineCtrl(int port, bool dtrState, bool rtsState);
1897  *           int port           : port number (0 - 127)
1898  *           bool dtr_active    : DTR output state
1899  *           bool rts_active    : RTS output state
1900  *
1901  *
1902  *      Function 15:    Setting the flow control of this port.
1903  *      Syntax:
1904  *      void MoxaPortFlowCtrl(int port, int rtsFlow, int ctsFlow, int rxFlow,
1905  *                            int txFlow,int xany);
1906  *           int port           : port number (0 - 127)
1907  *           int rtsFlow        : H/W RTS flow control (0: no, 1: yes)
1908  *           int ctsFlow        : H/W CTS flow control (0: no, 1: yes)
1909  *           int rxFlow         : S/W Rx XON/XOFF flow control (0: no, 1: yes)
1910  *           int txFlow         : S/W Tx XON/XOFF flow control (0: no, 1: yes)
1911  *           int xany           : S/W XANY flow control (0: no, 1: yes)
1912  *
1913  *
1914  *      Function 16:    Get ths line status of this port
1915  *      Syntax:
1916  *      int  MoxaPortLineStatus(int port);
1917  *           int port           : port number (0 - 127)
1918  *
1919  *           return:    Bit 0 - CTS state (0: off, 1: on)
1920  *                      Bit 1 - DSR state (0: off, 1: on)
1921  *                      Bit 2 - DCD state (0: off, 1: on)
1922  *
1923  *
1924  *      Function 19:    Flush the Rx/Tx buffer data of this port.
1925  *      Syntax:
1926  *      void MoxaPortFlushData(int port, int mode);
1927  *           int port           : port number (0 - 127)
1928  *           int mode
1929  *                      0       : flush the Rx buffer
1930  *                      1       : flush the Tx buffer
1931  *                      2       : flush the Rx and Tx buffer
1932  *
1933  *
1934  *      Function 20:    Write data.
1935  *      Syntax:
1936  *      int  MoxaPortWriteData(int port, unsigned char * buffer, int length);
1937  *           int port           : port number (0 - 127)
1938  *           unsigned char * buffer     : pointer to write data buffer.
1939  *           int length         : write data length
1940  *
1941  *           return:    0 - length      : real write data length
1942  *
1943  *
1944  *      Function 21:    Read data.
1945  *      Syntax:
1946  *      int  MoxaPortReadData(int port, struct tty_struct *tty);
1947  *           int port           : port number (0 - 127)
1948  *	     struct tty_struct *tty : tty for data
1949  *
1950  *           return:    0 - length      : real read data length
1951  *
1952  *
1953  *      Function 24:    Get the Tx buffer current queued data bytes
1954  *      Syntax:
1955  *      int  MoxaPortTxQueue(int port);
1956  *           int port           : port number (0 - 127)
1957  *
1958  *           return:    ..      : Tx buffer current queued data bytes
1959  *
1960  *
1961  *      Function 25:    Get the Tx buffer current free space
1962  *      Syntax:
1963  *      int  MoxaPortTxFree(int port);
1964  *           int port           : port number (0 - 127)
1965  *
1966  *           return:    ..      : Tx buffer current free space
1967  *
1968  *
1969  *      Function 26:    Get the Rx buffer current queued data bytes
1970  *      Syntax:
1971  *      int  MoxaPortRxQueue(int port);
1972  *           int port           : port number (0 - 127)
1973  *
1974  *           return:    ..      : Rx buffer current queued data bytes
1975  *
1976  *
1977  *      Function 28:    Disable port data transmission.
1978  *      Syntax:
1979  *      void MoxaPortTxDisable(int port);
1980  *           int port           : port number (0 - 127)
1981  *
1982  *
1983  *      Function 29:    Enable port data transmission.
1984  *      Syntax:
1985  *      void MoxaPortTxEnable(int port);
1986  *           int port           : port number (0 - 127)
1987  *
1988  *
1989  *      Function 31:    Get the received BREAK signal count and reset it.
1990  *      Syntax:
1991  *      int  MoxaPortResetBrkCnt(int port);
1992  *           int port           : port number (0 - 127)
1993  *
1994  *           return:    0 - ..  : BREAK signal count
1995  *
1996  *
1997  */
1998 
MoxaPortEnable(struct moxa_port * port)1999 static void MoxaPortEnable(struct moxa_port *port)
2000 {
2001 	void __iomem *ofsAddr;
2002 	u16 lowwater = 512;
2003 
2004 	ofsAddr = port->tableAddr;
2005 	writew(lowwater, ofsAddr + Low_water);
2006 	if (MOXA_IS_320(port->board))
2007 		moxafunc(ofsAddr, FC_SetBreakIrq, 0);
2008 	else
2009 		writew(readw(ofsAddr + HostStat) | WakeupBreak,
2010 				ofsAddr + HostStat);
2011 
2012 	moxafunc(ofsAddr, FC_SetLineIrq, Magic_code);
2013 	moxafunc(ofsAddr, FC_FlushQueue, 2);
2014 
2015 	moxafunc(ofsAddr, FC_EnableCH, Magic_code);
2016 	MoxaPortLineStatus(port);
2017 }
2018 
MoxaPortDisable(struct moxa_port * port)2019 static void MoxaPortDisable(struct moxa_port *port)
2020 {
2021 	void __iomem *ofsAddr = port->tableAddr;
2022 
2023 	moxafunc(ofsAddr, FC_SetFlowCtl, 0);	/* disable flow control */
2024 	moxafunc(ofsAddr, FC_ClrLineIrq, Magic_code);
2025 	writew(0, ofsAddr + HostStat);
2026 	moxafunc(ofsAddr, FC_DisableCH, Magic_code);
2027 }
2028 
MoxaPortSetBaud(struct moxa_port * port,speed_t baud)2029 static speed_t MoxaPortSetBaud(struct moxa_port *port, speed_t baud)
2030 {
2031 	void __iomem *ofsAddr = port->tableAddr;
2032 	unsigned int clock, val;
2033 	speed_t max;
2034 
2035 	max = MOXA_IS_320(port->board) ? 460800 : 921600;
2036 	if (baud < 50)
2037 		return 0;
2038 	if (baud > max)
2039 		baud = max;
2040 	clock = 921600;
2041 	val = clock / baud;
2042 	moxafunc(ofsAddr, FC_SetBaud, val);
2043 	baud = clock / val;
2044 	return baud;
2045 }
2046 
MoxaPortSetTermio(struct moxa_port * port,struct ktermios * termio,speed_t baud)2047 static int MoxaPortSetTermio(struct moxa_port *port, struct ktermios *termio,
2048 		speed_t baud)
2049 {
2050 	void __iomem *ofsAddr;
2051 	tcflag_t mode = 0;
2052 
2053 	ofsAddr = port->tableAddr;
2054 
2055 	mode = termio->c_cflag & CSIZE;
2056 	if (mode == CS5)
2057 		mode = MX_CS5;
2058 	else if (mode == CS6)
2059 		mode = MX_CS6;
2060 	else if (mode == CS7)
2061 		mode = MX_CS7;
2062 	else if (mode == CS8)
2063 		mode = MX_CS8;
2064 
2065 	if (termio->c_cflag & CSTOPB) {
2066 		if (mode == MX_CS5)
2067 			mode |= MX_STOP15;
2068 		else
2069 			mode |= MX_STOP2;
2070 	} else
2071 		mode |= MX_STOP1;
2072 
2073 	if (termio->c_cflag & PARENB) {
2074 		if (termio->c_cflag & PARODD) {
2075 			if (termio->c_cflag & CMSPAR)
2076 				mode |= MX_PARMARK;
2077 			else
2078 				mode |= MX_PARODD;
2079 		} else {
2080 			if (termio->c_cflag & CMSPAR)
2081 				mode |= MX_PARSPACE;
2082 			else
2083 				mode |= MX_PAREVEN;
2084 		}
2085 	} else
2086 		mode |= MX_PARNONE;
2087 
2088 	moxafunc(ofsAddr, FC_SetDataMode, (u16)mode);
2089 
2090 	if (MOXA_IS_320(port->board) && baud >= 921600)
2091 		return -1;
2092 
2093 	baud = MoxaPortSetBaud(port, baud);
2094 
2095 	if (termio->c_iflag & (IXON | IXOFF | IXANY)) {
2096 	        spin_lock_irq(&moxafunc_lock);
2097 		writeb(termio->c_cc[VSTART], ofsAddr + FuncArg);
2098 		writeb(termio->c_cc[VSTOP], ofsAddr + FuncArg1);
2099 		writeb(FC_SetXonXoff, ofsAddr + FuncCode);
2100 		moxa_wait_finish(ofsAddr);
2101 		spin_unlock_irq(&moxafunc_lock);
2102 
2103 	}
2104 	return baud;
2105 }
2106 
MoxaPortGetLineOut(struct moxa_port * port,bool * dtr_active,bool * rts_active)2107 static int MoxaPortGetLineOut(struct moxa_port *port, bool *dtr_active,
2108 		bool *rts_active)
2109 {
2110 	if (dtr_active)
2111 		*dtr_active = port->lineCtrl & DTR_ON;
2112 	if (rts_active)
2113 		*rts_active = port->lineCtrl & RTS_ON;
2114 
2115 	return 0;
2116 }
2117 
MoxaPortLineCtrl(struct moxa_port * port,bool dtr_active,bool rts_active)2118 static void MoxaPortLineCtrl(struct moxa_port *port, bool dtr_active, bool rts_active)
2119 {
2120 	u8 mode = 0;
2121 
2122 	if (dtr_active)
2123 		mode |= DTR_ON;
2124 	if (rts_active)
2125 		mode |= RTS_ON;
2126 	port->lineCtrl = mode;
2127 	moxafunc(port->tableAddr, FC_LineControl, mode);
2128 }
2129 
MoxaPortFlowCtrl(struct moxa_port * port,int rts,int cts,int txflow,int rxflow,int txany)2130 static void MoxaPortFlowCtrl(struct moxa_port *port, int rts, int cts,
2131 		int txflow, int rxflow, int txany)
2132 {
2133 	int mode = 0;
2134 
2135 	if (rts)
2136 		mode |= RTS_FlowCtl;
2137 	if (cts)
2138 		mode |= CTS_FlowCtl;
2139 	if (txflow)
2140 		mode |= Tx_FlowCtl;
2141 	if (rxflow)
2142 		mode |= Rx_FlowCtl;
2143 	if (txany)
2144 		mode |= IXM_IXANY;
2145 	moxafunc(port->tableAddr, FC_SetFlowCtl, mode);
2146 }
2147 
MoxaPortLineStatus(struct moxa_port * port)2148 static int MoxaPortLineStatus(struct moxa_port *port)
2149 {
2150 	void __iomem *ofsAddr;
2151 	int val;
2152 
2153 	ofsAddr = port->tableAddr;
2154 	if (MOXA_IS_320(port->board))
2155 		val = moxafuncret(ofsAddr, FC_LineStatus, 0);
2156 	else
2157 		val = readw(ofsAddr + FlagStat) >> 4;
2158 	val &= 0x0B;
2159 	if (val & 8)
2160 		val |= 4;
2161 	moxa_new_dcdstate(port, val & 8);
2162 	val &= 7;
2163 	return val;
2164 }
2165 
MoxaPortWriteData(struct tty_struct * tty,const u8 * buffer,int len)2166 static int MoxaPortWriteData(struct tty_struct *tty, const u8 *buffer, int len)
2167 {
2168 	struct moxa_port *port = tty->driver_data;
2169 	void __iomem *baseAddr, *ofsAddr, *ofs;
2170 	unsigned int c, total;
2171 	u16 head, tail, tx_mask, spage, epage;
2172 	u16 pageno, pageofs, bufhead;
2173 
2174 	ofsAddr = port->tableAddr;
2175 	baseAddr = port->board->basemem;
2176 	tx_mask = readw(ofsAddr + TX_mask);
2177 	spage = readw(ofsAddr + Page_txb);
2178 	epage = readw(ofsAddr + EndPage_txb);
2179 	tail = readw(ofsAddr + TXwptr);
2180 	head = readw(ofsAddr + TXrptr);
2181 	c = (head > tail) ? (head - tail - 1) : (head - tail + tx_mask);
2182 	if (c > len)
2183 		c = len;
2184 	moxaLog.txcnt[port->port.tty->index] += c;
2185 	total = c;
2186 	if (spage == epage) {
2187 		bufhead = readw(ofsAddr + Ofs_txb);
2188 		writew(spage, baseAddr + Control_reg);
2189 		while (c > 0) {
2190 			if (head > tail)
2191 				len = head - tail - 1;
2192 			else
2193 				len = tx_mask + 1 - tail;
2194 			len = (c > len) ? len : c;
2195 			ofs = baseAddr + DynPage_addr + bufhead + tail;
2196 			memcpy_toio(ofs, buffer, len);
2197 			buffer += len;
2198 			tail = (tail + len) & tx_mask;
2199 			c -= len;
2200 		}
2201 	} else {
2202 		pageno = spage + (tail >> 13);
2203 		pageofs = tail & Page_mask;
2204 		while (c > 0) {
2205 			len = Page_size - pageofs;
2206 			if (len > c)
2207 				len = c;
2208 			writeb(pageno, baseAddr + Control_reg);
2209 			ofs = baseAddr + DynPage_addr + pageofs;
2210 			memcpy_toio(ofs, buffer, len);
2211 			buffer += len;
2212 			if (++pageno == epage)
2213 				pageno = spage;
2214 			pageofs = 0;
2215 			c -= len;
2216 		}
2217 		tail = (tail + total) & tx_mask;
2218 	}
2219 	writew(tail, ofsAddr + TXwptr);
2220 	writeb(1, ofsAddr + CD180TXirq);	/* start to send */
2221 	return total;
2222 }
2223 
MoxaPortReadData(struct moxa_port * port)2224 static int MoxaPortReadData(struct moxa_port *port)
2225 {
2226 	struct tty_struct *tty = port->port.tty;
2227 	unsigned char *dst;
2228 	void __iomem *baseAddr, *ofsAddr, *ofs;
2229 	unsigned int count, len, total;
2230 	u16 tail, rx_mask, spage, epage;
2231 	u16 pageno, pageofs, bufhead, head;
2232 
2233 	ofsAddr = port->tableAddr;
2234 	baseAddr = port->board->basemem;
2235 	head = readw(ofsAddr + RXrptr);
2236 	tail = readw(ofsAddr + RXwptr);
2237 	rx_mask = readw(ofsAddr + RX_mask);
2238 	spage = readw(ofsAddr + Page_rxb);
2239 	epage = readw(ofsAddr + EndPage_rxb);
2240 	count = (tail >= head) ? (tail - head) : (tail - head + rx_mask + 1);
2241 	if (count == 0)
2242 		return 0;
2243 
2244 	total = count;
2245 	moxaLog.rxcnt[tty->index] += total;
2246 	if (spage == epage) {
2247 		bufhead = readw(ofsAddr + Ofs_rxb);
2248 		writew(spage, baseAddr + Control_reg);
2249 		while (count > 0) {
2250 			ofs = baseAddr + DynPage_addr + bufhead + head;
2251 			len = (tail >= head) ? (tail - head) :
2252 					(rx_mask + 1 - head);
2253 			len = tty_prepare_flip_string(&port->port, &dst,
2254 					min(len, count));
2255 			memcpy_fromio(dst, ofs, len);
2256 			head = (head + len) & rx_mask;
2257 			count -= len;
2258 		}
2259 	} else {
2260 		pageno = spage + (head >> 13);
2261 		pageofs = head & Page_mask;
2262 		while (count > 0) {
2263 			writew(pageno, baseAddr + Control_reg);
2264 			ofs = baseAddr + DynPage_addr + pageofs;
2265 			len = tty_prepare_flip_string(&port->port, &dst,
2266 					min(Page_size - pageofs, count));
2267 			memcpy_fromio(dst, ofs, len);
2268 
2269 			count -= len;
2270 			pageofs = (pageofs + len) & Page_mask;
2271 			if (pageofs == 0 && ++pageno == epage)
2272 				pageno = spage;
2273 		}
2274 		head = (head + total) & rx_mask;
2275 	}
2276 	writew(head, ofsAddr + RXrptr);
2277 	if (readb(ofsAddr + FlagStat) & Xoff_state) {
2278 		moxaLowWaterChk = 1;
2279 		port->lowChkFlag = 1;
2280 	}
2281 	return total;
2282 }
2283 
2284 
MoxaPortTxQueue(struct moxa_port * port)2285 static unsigned int MoxaPortTxQueue(struct moxa_port *port)
2286 {
2287 	void __iomem *ofsAddr = port->tableAddr;
2288 	u16 rptr, wptr, mask;
2289 
2290 	rptr = readw(ofsAddr + TXrptr);
2291 	wptr = readw(ofsAddr + TXwptr);
2292 	mask = readw(ofsAddr + TX_mask);
2293 	return (wptr - rptr) & mask;
2294 }
2295 
MoxaPortTxFree(struct moxa_port * port)2296 static unsigned int MoxaPortTxFree(struct moxa_port *port)
2297 {
2298 	void __iomem *ofsAddr = port->tableAddr;
2299 	u16 rptr, wptr, mask;
2300 
2301 	rptr = readw(ofsAddr + TXrptr);
2302 	wptr = readw(ofsAddr + TXwptr);
2303 	mask = readw(ofsAddr + TX_mask);
2304 	return mask - ((wptr - rptr) & mask);
2305 }
2306 
MoxaPortRxQueue(struct moxa_port * port)2307 static int MoxaPortRxQueue(struct moxa_port *port)
2308 {
2309 	void __iomem *ofsAddr = port->tableAddr;
2310 	u16 rptr, wptr, mask;
2311 
2312 	rptr = readw(ofsAddr + RXrptr);
2313 	wptr = readw(ofsAddr + RXwptr);
2314 	mask = readw(ofsAddr + RX_mask);
2315 	return (wptr - rptr) & mask;
2316 }
2317 
MoxaPortTxDisable(struct moxa_port * port)2318 static void MoxaPortTxDisable(struct moxa_port *port)
2319 {
2320 	moxafunc(port->tableAddr, FC_SetXoffState, Magic_code);
2321 }
2322 
MoxaPortTxEnable(struct moxa_port * port)2323 static void MoxaPortTxEnable(struct moxa_port *port)
2324 {
2325 	moxafunc(port->tableAddr, FC_SetXonState, Magic_code);
2326 }
2327 
moxa_get_serial_info(struct tty_struct * tty,struct serial_struct * ss)2328 static int moxa_get_serial_info(struct tty_struct *tty,
2329 		struct serial_struct *ss)
2330 {
2331 	struct moxa_port *info = tty->driver_data;
2332 
2333 	if (tty->index == MAX_PORTS)
2334 		return -EINVAL;
2335 	if (!info)
2336 		return -ENODEV;
2337 	mutex_lock(&info->port.mutex);
2338 	ss->type = info->type;
2339 	ss->line = info->port.tty->index;
2340 	ss->flags = info->port.flags;
2341 	ss->baud_base = 921600;
2342 	ss->close_delay = jiffies_to_msecs(info->port.close_delay) / 10;
2343 	mutex_unlock(&info->port.mutex);
2344 	return 0;
2345 }
2346 
2347 
moxa_set_serial_info(struct tty_struct * tty,struct serial_struct * ss)2348 static int moxa_set_serial_info(struct tty_struct *tty,
2349 		struct serial_struct *ss)
2350 {
2351 	struct moxa_port *info = tty->driver_data;
2352 	unsigned int close_delay;
2353 
2354 	if (tty->index == MAX_PORTS)
2355 		return -EINVAL;
2356 	if (!info)
2357 		return -ENODEV;
2358 
2359 	close_delay = msecs_to_jiffies(ss->close_delay * 10);
2360 
2361 	mutex_lock(&info->port.mutex);
2362 	if (!capable(CAP_SYS_ADMIN)) {
2363 		if (close_delay != info->port.close_delay ||
2364 		    ss->type != info->type ||
2365 		    ((ss->flags & ~ASYNC_USR_MASK) !=
2366 		     (info->port.flags & ~ASYNC_USR_MASK))) {
2367 			mutex_unlock(&info->port.mutex);
2368 			return -EPERM;
2369 		}
2370 	} else {
2371 		info->port.close_delay = close_delay;
2372 
2373 		MoxaSetFifo(info, ss->type == PORT_16550A);
2374 
2375 		info->type = ss->type;
2376 	}
2377 	mutex_unlock(&info->port.mutex);
2378 	return 0;
2379 }
2380 
2381 
2382 
2383 /*****************************************************************************
2384  *	Static local functions: 					     *
2385  *****************************************************************************/
2386 
MoxaSetFifo(struct moxa_port * port,int enable)2387 static void MoxaSetFifo(struct moxa_port *port, int enable)
2388 {
2389 	void __iomem *ofsAddr = port->tableAddr;
2390 
2391 	if (!enable) {
2392 		moxafunc(ofsAddr, FC_SetRxFIFOTrig, 0);
2393 		moxafunc(ofsAddr, FC_SetTxFIFOCnt, 1);
2394 	} else {
2395 		moxafunc(ofsAddr, FC_SetRxFIFOTrig, 3);
2396 		moxafunc(ofsAddr, FC_SetTxFIFOCnt, 16);
2397 	}
2398 }
2399