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e3b3d0f5 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | /* |
1da177e4 LT |
3 | * Serial driver for the amiga builtin port. |
4 | * | |
5 | * This code was created by taking serial.c version 4.30 from kernel | |
6 | * release 2.3.22, replacing all hardware related stuff with the | |
7 | * corresponding amiga hardware actions, and removing all irrelevant | |
8 | * code. As a consequence, it uses many of the constants and names | |
9 | * associated with the registers and bits of 16550 compatible UARTS - | |
10 | * but only to keep track of status, etc in the state variables. It | |
11 | * was done this was to make it easier to keep the code in line with | |
12 | * (non hardware specific) changes to serial.c. | |
13 | * | |
14 | * The port is registered with the tty driver as minor device 64, and | |
15 | * therefore other ports should should only use 65 upwards. | |
16 | * | |
17 | * Richard Lucock 28/12/99 | |
18 | * | |
19 | * Copyright (C) 1991, 1992 Linus Torvalds | |
20 | * Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, | |
21 | * 1998, 1999 Theodore Ts'o | |
22 | * | |
23 | */ | |
24 | ||
25 | /* | |
26 | * Serial driver configuration section. Here are the various options: | |
27 | * | |
28 | * SERIAL_PARANOIA_CHECK | |
29 | * Check the magic number for the async_structure where | |
30 | * ever possible. | |
31 | */ | |
32 | ||
1da177e4 LT |
33 | #include <linux/delay.h> |
34 | ||
35 | #undef SERIAL_PARANOIA_CHECK | |
1da177e4 LT |
36 | |
37 | /* Set of debugging defines */ | |
38 | ||
39 | #undef SERIAL_DEBUG_INTR | |
40 | #undef SERIAL_DEBUG_OPEN | |
41 | #undef SERIAL_DEBUG_FLOW | |
42 | #undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT | |
43 | ||
44 | /* Sanity checks */ | |
45 | ||
1da177e4 LT |
46 | #if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT) |
47 | #define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \ | |
01bd730d | 48 | tty->name, (info->tport.flags), serial_driver->refcount,info->count,tty->count,s) |
1da177e4 LT |
49 | #else |
50 | #define DBG_CNT(s) | |
51 | #endif | |
52 | ||
53 | /* | |
54 | * End of serial driver configuration section. | |
55 | */ | |
56 | ||
57 | #include <linux/module.h> | |
58 | ||
59 | #include <linux/types.h> | |
60 | #include <linux/serial.h> | |
1da177e4 LT |
61 | #include <linux/serial_reg.h> |
62 | static char *serial_version = "4.30"; | |
63 | ||
64 | #include <linux/errno.h> | |
65 | #include <linux/signal.h> | |
66 | #include <linux/sched.h> | |
67 | #include <linux/kernel.h> | |
68 | #include <linux/timer.h> | |
69 | #include <linux/interrupt.h> | |
70 | #include <linux/tty.h> | |
71 | #include <linux/tty_flip.h> | |
6fe18d26 | 72 | #include <linux/circ_buf.h> |
1da177e4 LT |
73 | #include <linux/console.h> |
74 | #include <linux/major.h> | |
75 | #include <linux/string.h> | |
76 | #include <linux/fcntl.h> | |
77 | #include <linux/ptrace.h> | |
78 | #include <linux/ioport.h> | |
79 | #include <linux/mm.h> | |
d594027d | 80 | #include <linux/seq_file.h> |
1da177e4 LT |
81 | #include <linux/slab.h> |
82 | #include <linux/init.h> | |
83 | #include <linux/bitops.h> | |
826e8c8c | 84 | #include <linux/platform_device.h> |
1da177e4 LT |
85 | |
86 | #include <asm/setup.h> | |
87 | ||
1da177e4 LT |
88 | |
89 | #include <asm/irq.h> | |
90 | ||
91 | #include <asm/amigahw.h> | |
92 | #include <asm/amigaints.h> | |
93 | ||
6fe18d26 JS |
94 | struct serial_state { |
95 | struct tty_port tport; | |
96 | struct circ_buf xmit; | |
97 | struct async_icount icount; | |
98 | ||
99 | unsigned long port; | |
100 | int baud_base; | |
101 | int xmit_fifo_size; | |
102 | int custom_divisor; | |
103 | int read_status_mask; | |
104 | int ignore_status_mask; | |
105 | int timeout; | |
106 | int quot; | |
107 | int IER; /* Interrupt Enable Register */ | |
108 | int MCR; /* Modem control register */ | |
109 | int x_char; /* xon/xoff character */ | |
110 | }; | |
111 | ||
b4290a23 | 112 | #define custom amiga_custom |
1da177e4 LT |
113 | static char *serial_name = "Amiga-builtin serial driver"; |
114 | ||
115 | static struct tty_driver *serial_driver; | |
116 | ||
117 | /* number of characters left in xmit buffer before we ask for more */ | |
118 | #define WAKEUP_CHARS 256 | |
119 | ||
1da177e4 LT |
120 | static unsigned char current_ctl_bits; |
121 | ||
588993dd JS |
122 | static void change_speed(struct tty_struct *tty, struct serial_state *info, |
123 | struct ktermios *old); | |
1da177e4 LT |
124 | static void rs_wait_until_sent(struct tty_struct *tty, int timeout); |
125 | ||
126 | ||
127 | static struct serial_state rs_table[1]; | |
128 | ||
fe971071 | 129 | #define NR_PORTS ARRAY_SIZE(rs_table) |
1da177e4 | 130 | |
7c0f6ba6 | 131 | #include <linux/uaccess.h> |
1da177e4 LT |
132 | |
133 | #define serial_isroot() (capable(CAP_SYS_ADMIN)) | |
134 | ||
135 | ||
916b7656 | 136 | static inline int serial_paranoia_check(struct serial_state *info, |
1da177e4 LT |
137 | char *name, const char *routine) |
138 | { | |
139 | #ifdef SERIAL_PARANOIA_CHECK | |
140 | static const char *badmagic = | |
141 | "Warning: bad magic number for serial struct (%s) in %s\n"; | |
142 | static const char *badinfo = | |
143 | "Warning: null async_struct for (%s) in %s\n"; | |
144 | ||
145 | if (!info) { | |
146 | printk(badinfo, name, routine); | |
147 | return 1; | |
148 | } | |
149 | if (info->magic != SERIAL_MAGIC) { | |
150 | printk(badmagic, name, routine); | |
151 | return 1; | |
152 | } | |
153 | #endif | |
154 | return 0; | |
155 | } | |
156 | ||
157 | /* some serial hardware definitions */ | |
158 | #define SDR_OVRUN (1<<15) | |
159 | #define SDR_RBF (1<<14) | |
160 | #define SDR_TBE (1<<13) | |
161 | #define SDR_TSRE (1<<12) | |
162 | ||
163 | #define SERPER_PARENB (1<<15) | |
164 | ||
165 | #define AC_SETCLR (1<<15) | |
166 | #define AC_UARTBRK (1<<11) | |
167 | ||
168 | #define SER_DTR (1<<7) | |
169 | #define SER_RTS (1<<6) | |
170 | #define SER_DCD (1<<5) | |
171 | #define SER_CTS (1<<4) | |
172 | #define SER_DSR (1<<3) | |
173 | ||
174 | static __inline__ void rtsdtr_ctrl(int bits) | |
175 | { | |
176 | ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR)); | |
177 | } | |
178 | ||
179 | /* | |
180 | * ------------------------------------------------------------ | |
181 | * rs_stop() and rs_start() | |
182 | * | |
183 | * This routines are called before setting or resetting tty->stopped. | |
184 | * They enable or disable transmitter interrupts, as necessary. | |
185 | * ------------------------------------------------------------ | |
186 | */ | |
187 | static void rs_stop(struct tty_struct *tty) | |
188 | { | |
916b7656 | 189 | struct serial_state *info = tty->driver_data; |
1da177e4 LT |
190 | unsigned long flags; |
191 | ||
192 | if (serial_paranoia_check(info, tty->name, "rs_stop")) | |
193 | return; | |
194 | ||
195 | local_irq_save(flags); | |
196 | if (info->IER & UART_IER_THRI) { | |
197 | info->IER &= ~UART_IER_THRI; | |
198 | /* disable Tx interrupt and remove any pending interrupts */ | |
199 | custom.intena = IF_TBE; | |
200 | mb(); | |
201 | custom.intreq = IF_TBE; | |
202 | mb(); | |
203 | } | |
204 | local_irq_restore(flags); | |
205 | } | |
206 | ||
207 | static void rs_start(struct tty_struct *tty) | |
208 | { | |
916b7656 | 209 | struct serial_state *info = tty->driver_data; |
1da177e4 LT |
210 | unsigned long flags; |
211 | ||
212 | if (serial_paranoia_check(info, tty->name, "rs_start")) | |
213 | return; | |
214 | ||
215 | local_irq_save(flags); | |
216 | if (info->xmit.head != info->xmit.tail | |
217 | && info->xmit.buf | |
218 | && !(info->IER & UART_IER_THRI)) { | |
219 | info->IER |= UART_IER_THRI; | |
220 | custom.intena = IF_SETCLR | IF_TBE; | |
221 | mb(); | |
222 | /* set a pending Tx Interrupt, transmitter should restart now */ | |
223 | custom.intreq = IF_SETCLR | IF_TBE; | |
224 | mb(); | |
225 | } | |
226 | local_irq_restore(flags); | |
227 | } | |
228 | ||
229 | /* | |
230 | * ---------------------------------------------------------------------- | |
231 | * | |
232 | * Here starts the interrupt handling routines. All of the following | |
233 | * subroutines are declared as inline and are folded into | |
234 | * rs_interrupt(). They were separated out for readability's sake. | |
235 | * | |
236 | * Note: rs_interrupt() is a "fast" interrupt, which means that it | |
237 | * runs with interrupts turned off. People who may want to modify | |
238 | * rs_interrupt() should try to keep the interrupt handler as fast as | |
239 | * possible. After you are done making modifications, it is not a bad | |
240 | * idea to do: | |
241 | * | |
242 | * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c | |
243 | * | |
244 | * and look at the resulting assemble code in serial.s. | |
245 | * | |
246 | * - Ted Ts'o (tytso@mit.edu), 7-Mar-93 | |
247 | * ----------------------------------------------------------------------- | |
248 | */ | |
249 | ||
916b7656 | 250 | static void receive_chars(struct serial_state *info) |
1da177e4 LT |
251 | { |
252 | int status; | |
253 | int serdatr; | |
33f0f88f | 254 | unsigned char ch, flag; |
1da177e4 | 255 | struct async_icount *icount; |
33f0f88f | 256 | int oe = 0; |
1da177e4 | 257 | |
916b7656 | 258 | icount = &info->icount; |
1da177e4 LT |
259 | |
260 | status = UART_LSR_DR; /* We obviously have a character! */ | |
261 | serdatr = custom.serdatr; | |
262 | mb(); | |
263 | custom.intreq = IF_RBF; | |
264 | mb(); | |
265 | ||
266 | if((serdatr & 0x1ff) == 0) | |
267 | status |= UART_LSR_BI; | |
268 | if(serdatr & SDR_OVRUN) | |
269 | status |= UART_LSR_OE; | |
270 | ||
271 | ch = serdatr & 0xff; | |
1da177e4 LT |
272 | icount->rx++; |
273 | ||
274 | #ifdef SERIAL_DEBUG_INTR | |
275 | printk("DR%02x:%02x...", ch, status); | |
276 | #endif | |
33f0f88f | 277 | flag = TTY_NORMAL; |
1da177e4 LT |
278 | |
279 | /* | |
280 | * We don't handle parity or frame errors - but I have left | |
281 | * the code in, since I'm not sure that the errors can't be | |
282 | * detected. | |
283 | */ | |
284 | ||
285 | if (status & (UART_LSR_BI | UART_LSR_PE | | |
286 | UART_LSR_FE | UART_LSR_OE)) { | |
287 | /* | |
288 | * For statistics only | |
289 | */ | |
290 | if (status & UART_LSR_BI) { | |
291 | status &= ~(UART_LSR_FE | UART_LSR_PE); | |
292 | icount->brk++; | |
293 | } else if (status & UART_LSR_PE) | |
294 | icount->parity++; | |
295 | else if (status & UART_LSR_FE) | |
296 | icount->frame++; | |
297 | if (status & UART_LSR_OE) | |
298 | icount->overrun++; | |
299 | ||
300 | /* | |
301 | * Now check to see if character should be | |
302 | * ignored, and mask off conditions which | |
303 | * should be ignored. | |
304 | */ | |
305 | if (status & info->ignore_status_mask) | |
33f0f88f | 306 | goto out; |
1da177e4 LT |
307 | |
308 | status &= info->read_status_mask; | |
309 | ||
310 | if (status & (UART_LSR_BI)) { | |
311 | #ifdef SERIAL_DEBUG_INTR | |
312 | printk("handling break...."); | |
313 | #endif | |
33f0f88f | 314 | flag = TTY_BREAK; |
01bd730d | 315 | if (info->tport.flags & ASYNC_SAK) |
2e124b4a | 316 | do_SAK(info->tport.tty); |
1da177e4 | 317 | } else if (status & UART_LSR_PE) |
33f0f88f | 318 | flag = TTY_PARITY; |
1da177e4 | 319 | else if (status & UART_LSR_FE) |
33f0f88f | 320 | flag = TTY_FRAME; |
1da177e4 LT |
321 | if (status & UART_LSR_OE) { |
322 | /* | |
323 | * Overrun is special, since it's | |
324 | * reported immediately, and doesn't | |
325 | * affect the current character | |
326 | */ | |
33f0f88f | 327 | oe = 1; |
1da177e4 LT |
328 | } |
329 | } | |
92a19f9c | 330 | tty_insert_flip_char(&info->tport, ch, flag); |
33f0f88f | 331 | if (oe == 1) |
92a19f9c | 332 | tty_insert_flip_char(&info->tport, 0, TTY_OVERRUN); |
2e124b4a | 333 | tty_flip_buffer_push(&info->tport); |
33f0f88f AC |
334 | out: |
335 | return; | |
1da177e4 LT |
336 | } |
337 | ||
916b7656 | 338 | static void transmit_chars(struct serial_state *info) |
1da177e4 LT |
339 | { |
340 | custom.intreq = IF_TBE; | |
341 | mb(); | |
342 | if (info->x_char) { | |
343 | custom.serdat = info->x_char | 0x100; | |
344 | mb(); | |
916b7656 | 345 | info->icount.tx++; |
1da177e4 LT |
346 | info->x_char = 0; |
347 | return; | |
348 | } | |
349 | if (info->xmit.head == info->xmit.tail | |
87758791 JS |
350 | || info->tport.tty->stopped |
351 | || info->tport.tty->hw_stopped) { | |
1da177e4 LT |
352 | info->IER &= ~UART_IER_THRI; |
353 | custom.intena = IF_TBE; | |
354 | mb(); | |
355 | return; | |
356 | } | |
357 | ||
358 | custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100; | |
359 | mb(); | |
360 | info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1); | |
916b7656 | 361 | info->icount.tx++; |
1da177e4 LT |
362 | |
363 | if (CIRC_CNT(info->xmit.head, | |
364 | info->xmit.tail, | |
365 | SERIAL_XMIT_SIZE) < WAKEUP_CHARS) | |
87758791 | 366 | tty_wakeup(info->tport.tty); |
1da177e4 LT |
367 | |
368 | #ifdef SERIAL_DEBUG_INTR | |
369 | printk("THRE..."); | |
370 | #endif | |
371 | if (info->xmit.head == info->xmit.tail) { | |
372 | custom.intena = IF_TBE; | |
373 | mb(); | |
374 | info->IER &= ~UART_IER_THRI; | |
375 | } | |
376 | } | |
377 | ||
916b7656 | 378 | static void check_modem_status(struct serial_state *info) |
1da177e4 | 379 | { |
7188dc20 | 380 | struct tty_port *port = &info->tport; |
1da177e4 LT |
381 | unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR); |
382 | unsigned char dstatus; | |
383 | struct async_icount *icount; | |
384 | ||
385 | /* Determine bits that have changed */ | |
386 | dstatus = status ^ current_ctl_bits; | |
387 | current_ctl_bits = status; | |
388 | ||
389 | if (dstatus) { | |
916b7656 | 390 | icount = &info->icount; |
1da177e4 LT |
391 | /* update input line counters */ |
392 | if (dstatus & SER_DSR) | |
393 | icount->dsr++; | |
394 | if (dstatus & SER_DCD) { | |
395 | icount->dcd++; | |
1da177e4 LT |
396 | } |
397 | if (dstatus & SER_CTS) | |
398 | icount->cts++; | |
7188dc20 | 399 | wake_up_interruptible(&port->delta_msr_wait); |
1da177e4 LT |
400 | } |
401 | ||
2d68655d | 402 | if (tty_port_check_carrier(port) && (dstatus & SER_DCD)) { |
1da177e4 LT |
403 | #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR)) |
404 | printk("ttyS%d CD now %s...", info->line, | |
405 | (!(status & SER_DCD)) ? "on" : "off"); | |
406 | #endif | |
407 | if (!(status & SER_DCD)) | |
7188dc20 | 408 | wake_up_interruptible(&port->open_wait); |
1da177e4 LT |
409 | else { |
410 | #ifdef SERIAL_DEBUG_OPEN | |
411 | printk("doing serial hangup..."); | |
412 | #endif | |
7188dc20 JS |
413 | if (port->tty) |
414 | tty_hangup(port->tty); | |
1da177e4 LT |
415 | } |
416 | } | |
f21ec3d2 | 417 | if (tty_port_cts_enabled(port)) { |
7188dc20 | 418 | if (port->tty->hw_stopped) { |
1da177e4 LT |
419 | if (!(status & SER_CTS)) { |
420 | #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW)) | |
421 | printk("CTS tx start..."); | |
422 | #endif | |
7188dc20 | 423 | port->tty->hw_stopped = 0; |
1da177e4 LT |
424 | info->IER |= UART_IER_THRI; |
425 | custom.intena = IF_SETCLR | IF_TBE; | |
426 | mb(); | |
427 | /* set a pending Tx Interrupt, transmitter should restart now */ | |
428 | custom.intreq = IF_SETCLR | IF_TBE; | |
429 | mb(); | |
7188dc20 | 430 | tty_wakeup(port->tty); |
1da177e4 LT |
431 | return; |
432 | } | |
433 | } else { | |
434 | if ((status & SER_CTS)) { | |
435 | #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW)) | |
436 | printk("CTS tx stop..."); | |
437 | #endif | |
7188dc20 | 438 | port->tty->hw_stopped = 1; |
1da177e4 LT |
439 | info->IER &= ~UART_IER_THRI; |
440 | /* disable Tx interrupt and remove any pending interrupts */ | |
441 | custom.intena = IF_TBE; | |
442 | mb(); | |
443 | custom.intreq = IF_TBE; | |
444 | mb(); | |
445 | } | |
446 | } | |
447 | } | |
448 | } | |
449 | ||
7d12e780 | 450 | static irqreturn_t ser_vbl_int( int irq, void *data) |
1da177e4 LT |
451 | { |
452 | /* vbl is just a periodic interrupt we tie into to update modem status */ | |
916b7656 | 453 | struct serial_state *info = data; |
1da177e4 LT |
454 | /* |
455 | * TBD - is it better to unregister from this interrupt or to | |
456 | * ignore it if MSI is clear ? | |
457 | */ | |
458 | if(info->IER & UART_IER_MSI) | |
459 | check_modem_status(info); | |
460 | return IRQ_HANDLED; | |
461 | } | |
462 | ||
7d12e780 | 463 | static irqreturn_t ser_rx_int(int irq, void *dev_id) |
1da177e4 | 464 | { |
916b7656 | 465 | struct serial_state *info = dev_id; |
1da177e4 LT |
466 | |
467 | #ifdef SERIAL_DEBUG_INTR | |
468 | printk("ser_rx_int..."); | |
469 | #endif | |
470 | ||
87758791 | 471 | if (!info->tport.tty) |
1da177e4 LT |
472 | return IRQ_NONE; |
473 | ||
474 | receive_chars(info); | |
1da177e4 LT |
475 | #ifdef SERIAL_DEBUG_INTR |
476 | printk("end.\n"); | |
477 | #endif | |
478 | return IRQ_HANDLED; | |
479 | } | |
480 | ||
7d12e780 | 481 | static irqreturn_t ser_tx_int(int irq, void *dev_id) |
1da177e4 | 482 | { |
916b7656 | 483 | struct serial_state *info = dev_id; |
1da177e4 LT |
484 | |
485 | if (custom.serdatr & SDR_TBE) { | |
486 | #ifdef SERIAL_DEBUG_INTR | |
487 | printk("ser_tx_int..."); | |
488 | #endif | |
489 | ||
87758791 | 490 | if (!info->tport.tty) |
1da177e4 LT |
491 | return IRQ_NONE; |
492 | ||
493 | transmit_chars(info); | |
1da177e4 LT |
494 | #ifdef SERIAL_DEBUG_INTR |
495 | printk("end.\n"); | |
496 | #endif | |
497 | } | |
498 | return IRQ_HANDLED; | |
499 | } | |
500 | ||
501 | /* | |
502 | * ------------------------------------------------------------------- | |
503 | * Here ends the serial interrupt routines. | |
504 | * ------------------------------------------------------------------- | |
505 | */ | |
506 | ||
1da177e4 LT |
507 | /* |
508 | * --------------------------------------------------------------- | |
509 | * Low level utility subroutines for the serial driver: routines to | |
510 | * figure out the appropriate timeout for an interrupt chain, routines | |
511 | * to initialize and startup a serial port, and routines to shutdown a | |
512 | * serial port. Useful stuff like that. | |
513 | * --------------------------------------------------------------- | |
514 | */ | |
515 | ||
588993dd | 516 | static int startup(struct tty_struct *tty, struct serial_state *info) |
1da177e4 | 517 | { |
01bd730d | 518 | struct tty_port *port = &info->tport; |
1da177e4 LT |
519 | unsigned long flags; |
520 | int retval=0; | |
521 | unsigned long page; | |
522 | ||
523 | page = get_zeroed_page(GFP_KERNEL); | |
524 | if (!page) | |
525 | return -ENOMEM; | |
526 | ||
527 | local_irq_save(flags); | |
528 | ||
d41861ca | 529 | if (tty_port_initialized(port)) { |
1da177e4 LT |
530 | free_page(page); |
531 | goto errout; | |
532 | } | |
533 | ||
534 | if (info->xmit.buf) | |
535 | free_page(page); | |
536 | else | |
537 | info->xmit.buf = (unsigned char *) page; | |
538 | ||
539 | #ifdef SERIAL_DEBUG_OPEN | |
540 | printk("starting up ttys%d ...", info->line); | |
541 | #endif | |
542 | ||
543 | /* Clear anything in the input buffer */ | |
544 | ||
545 | custom.intreq = IF_RBF; | |
546 | mb(); | |
547 | ||
548 | retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info); | |
549 | if (retval) { | |
550 | if (serial_isroot()) { | |
588993dd | 551 | set_bit(TTY_IO_ERROR, &tty->flags); |
1da177e4 LT |
552 | retval = 0; |
553 | } | |
554 | goto errout; | |
555 | } | |
556 | ||
557 | /* enable both Rx and Tx interrupts */ | |
558 | custom.intena = IF_SETCLR | IF_RBF | IF_TBE; | |
559 | mb(); | |
560 | info->IER = UART_IER_MSI; | |
561 | ||
562 | /* remember current state of the DCD and CTS bits */ | |
563 | current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR); | |
564 | ||
1da177e4 | 565 | info->MCR = 0; |
588993dd | 566 | if (C_BAUD(tty)) |
1da177e4 LT |
567 | info->MCR = SER_DTR | SER_RTS; |
568 | rtsdtr_ctrl(info->MCR); | |
569 | ||
588993dd | 570 | clear_bit(TTY_IO_ERROR, &tty->flags); |
1da177e4 LT |
571 | info->xmit.head = info->xmit.tail = 0; |
572 | ||
1da177e4 LT |
573 | /* |
574 | * and set the speed of the serial port | |
575 | */ | |
588993dd | 576 | change_speed(tty, info, NULL); |
1da177e4 | 577 | |
d41861ca | 578 | tty_port_set_initialized(port, 1); |
1da177e4 LT |
579 | local_irq_restore(flags); |
580 | return 0; | |
581 | ||
582 | errout: | |
583 | local_irq_restore(flags); | |
584 | return retval; | |
585 | } | |
586 | ||
587 | /* | |
588 | * This routine will shutdown a serial port; interrupts are disabled, and | |
589 | * DTR is dropped if the hangup on close termio flag is on. | |
590 | */ | |
588993dd | 591 | static void shutdown(struct tty_struct *tty, struct serial_state *info) |
1da177e4 LT |
592 | { |
593 | unsigned long flags; | |
594 | struct serial_state *state; | |
595 | ||
d41861ca | 596 | if (!tty_port_initialized(&info->tport)) |
1da177e4 LT |
597 | return; |
598 | ||
916b7656 | 599 | state = info; |
1da177e4 LT |
600 | |
601 | #ifdef SERIAL_DEBUG_OPEN | |
602 | printk("Shutting down serial port %d ....\n", info->line); | |
603 | #endif | |
604 | ||
605 | local_irq_save(flags); /* Disable interrupts */ | |
606 | ||
607 | /* | |
608 | * clear delta_msr_wait queue to avoid mem leaks: we may free the irq | |
609 | * here so the queue might never be waken up | |
610 | */ | |
87758791 | 611 | wake_up_interruptible(&info->tport.delta_msr_wait); |
1da177e4 | 612 | |
1da177e4 LT |
613 | /* |
614 | * Free the IRQ, if necessary | |
615 | */ | |
616 | free_irq(IRQ_AMIGA_VERTB, info); | |
617 | ||
618 | if (info->xmit.buf) { | |
619 | free_page((unsigned long) info->xmit.buf); | |
620 | info->xmit.buf = NULL; | |
621 | } | |
622 | ||
623 | info->IER = 0; | |
624 | custom.intena = IF_RBF | IF_TBE; | |
625 | mb(); | |
626 | ||
627 | /* disable break condition */ | |
628 | custom.adkcon = AC_UARTBRK; | |
629 | mb(); | |
630 | ||
9db276f8 | 631 | if (C_HUPCL(tty)) |
1da177e4 LT |
632 | info->MCR &= ~(SER_DTR|SER_RTS); |
633 | rtsdtr_ctrl(info->MCR); | |
634 | ||
588993dd | 635 | set_bit(TTY_IO_ERROR, &tty->flags); |
1da177e4 | 636 | |
d41861ca | 637 | tty_port_set_initialized(&info->tport, 0); |
1da177e4 LT |
638 | local_irq_restore(flags); |
639 | } | |
640 | ||
641 | ||
642 | /* | |
643 | * This routine is called to set the UART divisor registers to match | |
644 | * the specified baud rate for a serial port. | |
645 | */ | |
588993dd | 646 | static void change_speed(struct tty_struct *tty, struct serial_state *info, |
606d099c | 647 | struct ktermios *old_termios) |
1da177e4 | 648 | { |
01bd730d | 649 | struct tty_port *port = &info->tport; |
1da177e4 LT |
650 | int quot = 0, baud_base, baud; |
651 | unsigned cflag, cval = 0; | |
652 | int bits; | |
653 | unsigned long flags; | |
654 | ||
adc8d746 | 655 | cflag = tty->termios.c_cflag; |
1da177e4 LT |
656 | |
657 | /* Byte size is always 8 bits plus parity bit if requested */ | |
658 | ||
659 | cval = 3; bits = 10; | |
660 | if (cflag & CSTOPB) { | |
661 | cval |= 0x04; | |
662 | bits++; | |
663 | } | |
664 | if (cflag & PARENB) { | |
665 | cval |= UART_LCR_PARITY; | |
666 | bits++; | |
667 | } | |
668 | if (!(cflag & PARODD)) | |
669 | cval |= UART_LCR_EPAR; | |
670 | #ifdef CMSPAR | |
671 | if (cflag & CMSPAR) | |
672 | cval |= UART_LCR_SPAR; | |
673 | #endif | |
674 | ||
675 | /* Determine divisor based on baud rate */ | |
588993dd | 676 | baud = tty_get_baud_rate(tty); |
1da177e4 LT |
677 | if (!baud) |
678 | baud = 9600; /* B0 transition handled in rs_set_termios */ | |
916b7656 | 679 | baud_base = info->baud_base; |
01bd730d | 680 | if (baud == 38400 && (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) |
916b7656 | 681 | quot = info->custom_divisor; |
1da177e4 LT |
682 | else { |
683 | if (baud == 134) | |
684 | /* Special case since 134 is really 134.5 */ | |
685 | quot = (2*baud_base / 269); | |
686 | else if (baud) | |
687 | quot = baud_base / baud; | |
688 | } | |
689 | /* If the quotient is zero refuse the change */ | |
690 | if (!quot && old_termios) { | |
db0ef08e | 691 | /* FIXME: Will need updating for new tty in the end */ |
adc8d746 AC |
692 | tty->termios.c_cflag &= ~CBAUD; |
693 | tty->termios.c_cflag |= (old_termios->c_cflag & CBAUD); | |
588993dd | 694 | baud = tty_get_baud_rate(tty); |
1da177e4 LT |
695 | if (!baud) |
696 | baud = 9600; | |
697 | if (baud == 38400 && | |
01bd730d | 698 | (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) |
916b7656 | 699 | quot = info->custom_divisor; |
1da177e4 LT |
700 | else { |
701 | if (baud == 134) | |
702 | /* Special case since 134 is really 134.5 */ | |
703 | quot = (2*baud_base / 269); | |
704 | else if (baud) | |
705 | quot = baud_base / baud; | |
706 | } | |
707 | } | |
708 | /* As a last resort, if the quotient is zero, default to 9600 bps */ | |
709 | if (!quot) | |
710 | quot = baud_base / 9600; | |
711 | info->quot = quot; | |
916b7656 | 712 | info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base); |
1da177e4 LT |
713 | info->timeout += HZ/50; /* Add .02 seconds of slop */ |
714 | ||
715 | /* CTS flow control flag and modem status interrupts */ | |
716 | info->IER &= ~UART_IER_MSI; | |
01bd730d | 717 | if (port->flags & ASYNC_HARDPPS_CD) |
1da177e4 | 718 | info->IER |= UART_IER_MSI; |
5604a98e PH |
719 | tty_port_set_cts_flow(port, cflag & CRTSCTS); |
720 | if (cflag & CRTSCTS) | |
1da177e4 | 721 | info->IER |= UART_IER_MSI; |
2d68655d PH |
722 | tty_port_set_check_carrier(port, ~cflag & CLOCAL); |
723 | if (~cflag & CLOCAL) | |
1da177e4 | 724 | info->IER |= UART_IER_MSI; |
1da177e4 | 725 | /* TBD: |
4b512d26 | 726 | * Does clearing IER_MSI imply that we should disable the VBL interrupt ? |
1da177e4 LT |
727 | */ |
728 | ||
729 | /* | |
730 | * Set up parity check flag | |
731 | */ | |
1da177e4 LT |
732 | |
733 | info->read_status_mask = UART_LSR_OE | UART_LSR_DR; | |
588993dd | 734 | if (I_INPCK(tty)) |
1da177e4 | 735 | info->read_status_mask |= UART_LSR_FE | UART_LSR_PE; |
588993dd | 736 | if (I_BRKINT(tty) || I_PARMRK(tty)) |
1da177e4 LT |
737 | info->read_status_mask |= UART_LSR_BI; |
738 | ||
739 | /* | |
740 | * Characters to ignore | |
741 | */ | |
742 | info->ignore_status_mask = 0; | |
588993dd | 743 | if (I_IGNPAR(tty)) |
1da177e4 | 744 | info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; |
588993dd | 745 | if (I_IGNBRK(tty)) { |
1da177e4 LT |
746 | info->ignore_status_mask |= UART_LSR_BI; |
747 | /* | |
748 | * If we're ignore parity and break indicators, ignore | |
749 | * overruns too. (For real raw support). | |
750 | */ | |
588993dd | 751 | if (I_IGNPAR(tty)) |
1da177e4 LT |
752 | info->ignore_status_mask |= UART_LSR_OE; |
753 | } | |
754 | /* | |
755 | * !!! ignore all characters if CREAD is not set | |
756 | */ | |
757 | if ((cflag & CREAD) == 0) | |
758 | info->ignore_status_mask |= UART_LSR_DR; | |
759 | local_irq_save(flags); | |
760 | ||
761 | { | |
762 | short serper; | |
763 | ||
764 | /* Set up the baud rate */ | |
765 | serper = quot - 1; | |
766 | ||
767 | /* Enable or disable parity bit */ | |
768 | ||
769 | if(cval & UART_LCR_PARITY) | |
770 | serper |= (SERPER_PARENB); | |
771 | ||
772 | custom.serper = serper; | |
773 | mb(); | |
774 | } | |
775 | ||
1da177e4 LT |
776 | local_irq_restore(flags); |
777 | } | |
778 | ||
257afa3c | 779 | static int rs_put_char(struct tty_struct *tty, unsigned char ch) |
1da177e4 | 780 | { |
916b7656 | 781 | struct serial_state *info; |
1da177e4 LT |
782 | unsigned long flags; |
783 | ||
d9ad7ef1 TJRMI |
784 | info = tty->driver_data; |
785 | ||
1da177e4 | 786 | if (serial_paranoia_check(info, tty->name, "rs_put_char")) |
257afa3c | 787 | return 0; |
1da177e4 | 788 | |
d9ad7ef1 | 789 | if (!info->xmit.buf) |
257afa3c | 790 | return 0; |
1da177e4 LT |
791 | |
792 | local_irq_save(flags); | |
793 | if (CIRC_SPACE(info->xmit.head, | |
794 | info->xmit.tail, | |
795 | SERIAL_XMIT_SIZE) == 0) { | |
796 | local_irq_restore(flags); | |
257afa3c | 797 | return 0; |
1da177e4 LT |
798 | } |
799 | ||
800 | info->xmit.buf[info->xmit.head++] = ch; | |
801 | info->xmit.head &= SERIAL_XMIT_SIZE-1; | |
802 | local_irq_restore(flags); | |
257afa3c | 803 | return 1; |
1da177e4 LT |
804 | } |
805 | ||
806 | static void rs_flush_chars(struct tty_struct *tty) | |
807 | { | |
916b7656 | 808 | struct serial_state *info = tty->driver_data; |
1da177e4 LT |
809 | unsigned long flags; |
810 | ||
811 | if (serial_paranoia_check(info, tty->name, "rs_flush_chars")) | |
812 | return; | |
813 | ||
814 | if (info->xmit.head == info->xmit.tail | |
815 | || tty->stopped | |
816 | || tty->hw_stopped | |
817 | || !info->xmit.buf) | |
818 | return; | |
819 | ||
820 | local_irq_save(flags); | |
821 | info->IER |= UART_IER_THRI; | |
822 | custom.intena = IF_SETCLR | IF_TBE; | |
823 | mb(); | |
824 | /* set a pending Tx Interrupt, transmitter should restart now */ | |
825 | custom.intreq = IF_SETCLR | IF_TBE; | |
826 | mb(); | |
827 | local_irq_restore(flags); | |
828 | } | |
829 | ||
830 | static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count) | |
831 | { | |
832 | int c, ret = 0; | |
916b7656 | 833 | struct serial_state *info = tty->driver_data; |
1da177e4 LT |
834 | unsigned long flags; |
835 | ||
836 | if (serial_paranoia_check(info, tty->name, "rs_write")) | |
837 | return 0; | |
838 | ||
b3218a79 | 839 | if (!info->xmit.buf) |
1da177e4 LT |
840 | return 0; |
841 | ||
3abf3bed | 842 | local_irq_save(flags); |
1da177e4 LT |
843 | while (1) { |
844 | c = CIRC_SPACE_TO_END(info->xmit.head, | |
845 | info->xmit.tail, | |
846 | SERIAL_XMIT_SIZE); | |
847 | if (count < c) | |
848 | c = count; | |
849 | if (c <= 0) { | |
850 | break; | |
851 | } | |
852 | memcpy(info->xmit.buf + info->xmit.head, buf, c); | |
853 | info->xmit.head = ((info->xmit.head + c) & | |
854 | (SERIAL_XMIT_SIZE-1)); | |
855 | buf += c; | |
856 | count -= c; | |
857 | ret += c; | |
858 | } | |
859 | local_irq_restore(flags); | |
860 | ||
861 | if (info->xmit.head != info->xmit.tail | |
862 | && !tty->stopped | |
863 | && !tty->hw_stopped | |
864 | && !(info->IER & UART_IER_THRI)) { | |
865 | info->IER |= UART_IER_THRI; | |
866 | local_irq_disable(); | |
867 | custom.intena = IF_SETCLR | IF_TBE; | |
868 | mb(); | |
869 | /* set a pending Tx Interrupt, transmitter should restart now */ | |
870 | custom.intreq = IF_SETCLR | IF_TBE; | |
871 | mb(); | |
872 | local_irq_restore(flags); | |
873 | } | |
874 | return ret; | |
875 | } | |
876 | ||
877 | static int rs_write_room(struct tty_struct *tty) | |
878 | { | |
916b7656 | 879 | struct serial_state *info = tty->driver_data; |
1da177e4 LT |
880 | |
881 | if (serial_paranoia_check(info, tty->name, "rs_write_room")) | |
882 | return 0; | |
883 | return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); | |
884 | } | |
885 | ||
886 | static int rs_chars_in_buffer(struct tty_struct *tty) | |
887 | { | |
916b7656 | 888 | struct serial_state *info = tty->driver_data; |
1da177e4 LT |
889 | |
890 | if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer")) | |
891 | return 0; | |
892 | return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); | |
893 | } | |
894 | ||
895 | static void rs_flush_buffer(struct tty_struct *tty) | |
896 | { | |
916b7656 | 897 | struct serial_state *info = tty->driver_data; |
1da177e4 LT |
898 | unsigned long flags; |
899 | ||
900 | if (serial_paranoia_check(info, tty->name, "rs_flush_buffer")) | |
901 | return; | |
902 | local_irq_save(flags); | |
903 | info->xmit.head = info->xmit.tail = 0; | |
904 | local_irq_restore(flags); | |
1da177e4 LT |
905 | tty_wakeup(tty); |
906 | } | |
907 | ||
908 | /* | |
909 | * This function is used to send a high-priority XON/XOFF character to | |
910 | * the device | |
911 | */ | |
912 | static void rs_send_xchar(struct tty_struct *tty, char ch) | |
913 | { | |
916b7656 | 914 | struct serial_state *info = tty->driver_data; |
1da177e4 LT |
915 | unsigned long flags; |
916 | ||
1d6a5e4c | 917 | if (serial_paranoia_check(info, tty->name, "rs_send_xchar")) |
1da177e4 LT |
918 | return; |
919 | ||
920 | info->x_char = ch; | |
921 | if (ch) { | |
922 | /* Make sure transmit interrupts are on */ | |
923 | ||
924 | /* Check this ! */ | |
925 | local_irq_save(flags); | |
926 | if(!(custom.intenar & IF_TBE)) { | |
927 | custom.intena = IF_SETCLR | IF_TBE; | |
928 | mb(); | |
929 | /* set a pending Tx Interrupt, transmitter should restart now */ | |
930 | custom.intreq = IF_SETCLR | IF_TBE; | |
931 | mb(); | |
932 | } | |
933 | local_irq_restore(flags); | |
934 | ||
935 | info->IER |= UART_IER_THRI; | |
936 | } | |
937 | } | |
938 | ||
939 | /* | |
940 | * ------------------------------------------------------------ | |
941 | * rs_throttle() | |
942 | * | |
943 | * This routine is called by the upper-layer tty layer to signal that | |
944 | * incoming characters should be throttled. | |
945 | * ------------------------------------------------------------ | |
946 | */ | |
947 | static void rs_throttle(struct tty_struct * tty) | |
948 | { | |
916b7656 | 949 | struct serial_state *info = tty->driver_data; |
1da177e4 LT |
950 | unsigned long flags; |
951 | #ifdef SERIAL_DEBUG_THROTTLE | |
fdfb719e | 952 | printk("throttle %s ....\n", tty_name(tty)); |
1da177e4 LT |
953 | #endif |
954 | ||
955 | if (serial_paranoia_check(info, tty->name, "rs_throttle")) | |
956 | return; | |
957 | ||
958 | if (I_IXOFF(tty)) | |
959 | rs_send_xchar(tty, STOP_CHAR(tty)); | |
960 | ||
9db276f8 | 961 | if (C_CRTSCTS(tty)) |
1da177e4 LT |
962 | info->MCR &= ~SER_RTS; |
963 | ||
964 | local_irq_save(flags); | |
965 | rtsdtr_ctrl(info->MCR); | |
966 | local_irq_restore(flags); | |
967 | } | |
968 | ||
969 | static void rs_unthrottle(struct tty_struct * tty) | |
970 | { | |
916b7656 | 971 | struct serial_state *info = tty->driver_data; |
1da177e4 LT |
972 | unsigned long flags; |
973 | #ifdef SERIAL_DEBUG_THROTTLE | |
fdfb719e | 974 | printk("unthrottle %s ....\n", tty_name(tty)); |
1da177e4 LT |
975 | #endif |
976 | ||
977 | if (serial_paranoia_check(info, tty->name, "rs_unthrottle")) | |
978 | return; | |
979 | ||
980 | if (I_IXOFF(tty)) { | |
981 | if (info->x_char) | |
982 | info->x_char = 0; | |
983 | else | |
984 | rs_send_xchar(tty, START_CHAR(tty)); | |
985 | } | |
9db276f8 | 986 | if (C_CRTSCTS(tty)) |
1da177e4 LT |
987 | info->MCR |= SER_RTS; |
988 | local_irq_save(flags); | |
989 | rtsdtr_ctrl(info->MCR); | |
990 | local_irq_restore(flags); | |
991 | } | |
992 | ||
993 | /* | |
994 | * ------------------------------------------------------------ | |
995 | * rs_ioctl() and friends | |
996 | * ------------------------------------------------------------ | |
997 | */ | |
998 | ||
ff169e5c | 999 | static int get_serial_info(struct tty_struct *tty, struct serial_state *state, |
ab14caec | 1000 | struct serial_struct __user * retinfo) |
1da177e4 LT |
1001 | { |
1002 | struct serial_struct tmp; | |
1da177e4 | 1003 | |
1da177e4 | 1004 | memset(&tmp, 0, sizeof(tmp)); |
89c8d91e | 1005 | tty_lock(tty); |
ff169e5c | 1006 | tmp.line = tty->index; |
1da177e4 | 1007 | tmp.port = state->port; |
01bd730d | 1008 | tmp.flags = state->tport.flags; |
1da177e4 LT |
1009 | tmp.xmit_fifo_size = state->xmit_fifo_size; |
1010 | tmp.baud_base = state->baud_base; | |
799be6ff JS |
1011 | tmp.close_delay = state->tport.close_delay; |
1012 | tmp.closing_wait = state->tport.closing_wait; | |
1da177e4 | 1013 | tmp.custom_divisor = state->custom_divisor; |
89c8d91e | 1014 | tty_unlock(tty); |
1da177e4 LT |
1015 | if (copy_to_user(retinfo,&tmp,sizeof(*retinfo))) |
1016 | return -EFAULT; | |
1017 | return 0; | |
1018 | } | |
1019 | ||
588993dd | 1020 | static int set_serial_info(struct tty_struct *tty, struct serial_state *state, |
ab14caec | 1021 | struct serial_struct __user * new_info) |
1da177e4 | 1022 | { |
01bd730d | 1023 | struct tty_port *port = &state->tport; |
1da177e4 | 1024 | struct serial_struct new_serial; |
0f9b9684 | 1025 | bool change_spd; |
1da177e4 LT |
1026 | int retval = 0; |
1027 | ||
1028 | if (copy_from_user(&new_serial,new_info,sizeof(new_serial))) | |
1029 | return -EFAULT; | |
e18ce49b | 1030 | |
89c8d91e | 1031 | tty_lock(tty); |
01bd730d | 1032 | change_spd = ((new_serial.flags ^ port->flags) & ASYNC_SPD_MASK) || |
0f9b9684 | 1033 | new_serial.custom_divisor != state->custom_divisor; |
ff169e5c | 1034 | if (new_serial.irq || new_serial.port != state->port || |
0f9b9684 | 1035 | new_serial.xmit_fifo_size != state->xmit_fifo_size) { |
89c8d91e | 1036 | tty_unlock(tty); |
0f9b9684 | 1037 | return -EINVAL; |
e18ce49b | 1038 | } |
1da177e4 LT |
1039 | |
1040 | if (!serial_isroot()) { | |
1041 | if ((new_serial.baud_base != state->baud_base) || | |
01bd730d | 1042 | (new_serial.close_delay != port->close_delay) || |
1da177e4 LT |
1043 | (new_serial.xmit_fifo_size != state->xmit_fifo_size) || |
1044 | ((new_serial.flags & ~ASYNC_USR_MASK) != | |
d3a7b83f | 1045 | (port->flags & ~ASYNC_USR_MASK))) { |
89c8d91e | 1046 | tty_unlock(tty); |
1da177e4 | 1047 | return -EPERM; |
d3a7b83f | 1048 | } |
01bd730d | 1049 | port->flags = ((port->flags & ~ASYNC_USR_MASK) | |
1da177e4 | 1050 | (new_serial.flags & ASYNC_USR_MASK)); |
1da177e4 LT |
1051 | state->custom_divisor = new_serial.custom_divisor; |
1052 | goto check_and_exit; | |
1053 | } | |
1054 | ||
e18ce49b | 1055 | if (new_serial.baud_base < 9600) { |
89c8d91e | 1056 | tty_unlock(tty); |
1da177e4 | 1057 | return -EINVAL; |
e18ce49b | 1058 | } |
1da177e4 LT |
1059 | |
1060 | /* | |
1061 | * OK, past this point, all the error checking has been done. | |
1062 | * At this point, we start making changes..... | |
1063 | */ | |
1064 | ||
1065 | state->baud_base = new_serial.baud_base; | |
01bd730d | 1066 | port->flags = ((port->flags & ~ASYNC_FLAGS) | |
1da177e4 | 1067 | (new_serial.flags & ASYNC_FLAGS)); |
1da177e4 | 1068 | state->custom_divisor = new_serial.custom_divisor; |
01bd730d JS |
1069 | port->close_delay = new_serial.close_delay * HZ/100; |
1070 | port->closing_wait = new_serial.closing_wait * HZ/100; | |
d6c53c0e | 1071 | port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0; |
1da177e4 LT |
1072 | |
1073 | check_and_exit: | |
d41861ca | 1074 | if (tty_port_initialized(port)) { |
0f9b9684 | 1075 | if (change_spd) { |
6086380a JH |
1076 | /* warn about deprecation unless clearing */ |
1077 | if (new_serial.flags & ASYNC_SPD_MASK) | |
1078 | dev_warn_ratelimited(tty->dev, "use of SPD flags is deprecated\n"); | |
588993dd | 1079 | change_speed(tty, state, NULL); |
1da177e4 LT |
1080 | } |
1081 | } else | |
588993dd | 1082 | retval = startup(tty, state); |
89c8d91e | 1083 | tty_unlock(tty); |
1da177e4 LT |
1084 | return retval; |
1085 | } | |
1086 | ||
1087 | ||
1088 | /* | |
1089 | * get_lsr_info - get line status register info | |
1090 | * | |
1091 | * Purpose: Let user call ioctl() to get info when the UART physically | |
1092 | * is emptied. On bus types like RS485, the transmitter must | |
1093 | * release the bus after transmitting. This must be done when | |
1094 | * the transmit shift register is empty, not be done when the | |
1095 | * transmit holding register is empty. This functionality | |
1096 | * allows an RS485 driver to be written in user space. | |
1097 | */ | |
916b7656 | 1098 | static int get_lsr_info(struct serial_state *info, unsigned int __user *value) |
1da177e4 LT |
1099 | { |
1100 | unsigned char status; | |
1101 | unsigned int result; | |
1102 | unsigned long flags; | |
1103 | ||
1104 | local_irq_save(flags); | |
1105 | status = custom.serdatr; | |
1106 | mb(); | |
1107 | local_irq_restore(flags); | |
1108 | result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0); | |
1109 | if (copy_to_user(value, &result, sizeof(int))) | |
1110 | return -EFAULT; | |
1111 | return 0; | |
1112 | } | |
1113 | ||
1114 | ||
60b33c13 | 1115 | static int rs_tiocmget(struct tty_struct *tty) |
1da177e4 | 1116 | { |
916b7656 | 1117 | struct serial_state *info = tty->driver_data; |
1da177e4 LT |
1118 | unsigned char control, status; |
1119 | unsigned long flags; | |
1120 | ||
1121 | if (serial_paranoia_check(info, tty->name, "rs_ioctl")) | |
1122 | return -ENODEV; | |
18900ca6 | 1123 | if (tty_io_error(tty)) |
1da177e4 LT |
1124 | return -EIO; |
1125 | ||
1126 | control = info->MCR; | |
1127 | local_irq_save(flags); | |
1128 | status = ciab.pra; | |
1129 | local_irq_restore(flags); | |
1130 | return ((control & SER_RTS) ? TIOCM_RTS : 0) | |
1131 | | ((control & SER_DTR) ? TIOCM_DTR : 0) | |
1132 | | (!(status & SER_DCD) ? TIOCM_CAR : 0) | |
1133 | | (!(status & SER_DSR) ? TIOCM_DSR : 0) | |
1134 | | (!(status & SER_CTS) ? TIOCM_CTS : 0); | |
1135 | } | |
1136 | ||
20b9d177 AC |
1137 | static int rs_tiocmset(struct tty_struct *tty, unsigned int set, |
1138 | unsigned int clear) | |
1da177e4 | 1139 | { |
916b7656 | 1140 | struct serial_state *info = tty->driver_data; |
1da177e4 LT |
1141 | unsigned long flags; |
1142 | ||
1143 | if (serial_paranoia_check(info, tty->name, "rs_ioctl")) | |
1144 | return -ENODEV; | |
18900ca6 | 1145 | if (tty_io_error(tty)) |
1da177e4 LT |
1146 | return -EIO; |
1147 | ||
1148 | local_irq_save(flags); | |
1149 | if (set & TIOCM_RTS) | |
1150 | info->MCR |= SER_RTS; | |
1151 | if (set & TIOCM_DTR) | |
1152 | info->MCR |= SER_DTR; | |
1153 | if (clear & TIOCM_RTS) | |
1154 | info->MCR &= ~SER_RTS; | |
1155 | if (clear & TIOCM_DTR) | |
1156 | info->MCR &= ~SER_DTR; | |
1157 | rtsdtr_ctrl(info->MCR); | |
1158 | local_irq_restore(flags); | |
1159 | return 0; | |
1160 | } | |
1161 | ||
1162 | /* | |
1163 | * rs_break() --- routine which turns the break handling on or off | |
1164 | */ | |
9e98966c | 1165 | static int rs_break(struct tty_struct *tty, int break_state) |
1da177e4 | 1166 | { |
916b7656 | 1167 | struct serial_state *info = tty->driver_data; |
1da177e4 LT |
1168 | unsigned long flags; |
1169 | ||
1170 | if (serial_paranoia_check(info, tty->name, "rs_break")) | |
970a8a51 | 1171 | return -EINVAL; |
1da177e4 LT |
1172 | |
1173 | local_irq_save(flags); | |
1174 | if (break_state == -1) | |
1175 | custom.adkcon = AC_SETCLR | AC_UARTBRK; | |
1176 | else | |
1177 | custom.adkcon = AC_UARTBRK; | |
1178 | mb(); | |
1179 | local_irq_restore(flags); | |
9e98966c | 1180 | return 0; |
1da177e4 LT |
1181 | } |
1182 | ||
0587102c AC |
1183 | /* |
1184 | * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) | |
1185 | * Return: write counters to the user passed counter struct | |
1186 | * NB: both 1->0 and 0->1 transitions are counted except for | |
1187 | * RI where only 0->1 is counted. | |
1188 | */ | |
1189 | static int rs_get_icount(struct tty_struct *tty, | |
1190 | struct serial_icounter_struct *icount) | |
1191 | { | |
916b7656 | 1192 | struct serial_state *info = tty->driver_data; |
0587102c AC |
1193 | struct async_icount cnow; |
1194 | unsigned long flags; | |
1195 | ||
1196 | local_irq_save(flags); | |
916b7656 | 1197 | cnow = info->icount; |
0587102c AC |
1198 | local_irq_restore(flags); |
1199 | icount->cts = cnow.cts; | |
1200 | icount->dsr = cnow.dsr; | |
1201 | icount->rng = cnow.rng; | |
1202 | icount->dcd = cnow.dcd; | |
1203 | icount->rx = cnow.rx; | |
1204 | icount->tx = cnow.tx; | |
1205 | icount->frame = cnow.frame; | |
1206 | icount->overrun = cnow.overrun; | |
1207 | icount->parity = cnow.parity; | |
1208 | icount->brk = cnow.brk; | |
1209 | icount->buf_overrun = cnow.buf_overrun; | |
1210 | ||
1211 | return 0; | |
1212 | } | |
1da177e4 | 1213 | |
6caa76b7 | 1214 | static int rs_ioctl(struct tty_struct *tty, |
1da177e4 LT |
1215 | unsigned int cmd, unsigned long arg) |
1216 | { | |
916b7656 | 1217 | struct serial_state *info = tty->driver_data; |
1da177e4 | 1218 | struct async_icount cprev, cnow; /* kernel counter temps */ |
ab14caec | 1219 | void __user *argp = (void __user *)arg; |
1da177e4 | 1220 | unsigned long flags; |
591cee0a AB |
1221 | DEFINE_WAIT(wait); |
1222 | int ret; | |
1da177e4 LT |
1223 | |
1224 | if (serial_paranoia_check(info, tty->name, "rs_ioctl")) | |
1225 | return -ENODEV; | |
1226 | ||
1227 | if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && | |
1228 | (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) && | |
1229 | (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) { | |
18900ca6 | 1230 | if (tty_io_error(tty)) |
1da177e4 LT |
1231 | return -EIO; |
1232 | } | |
1233 | ||
1234 | switch (cmd) { | |
1235 | case TIOCGSERIAL: | |
ff169e5c | 1236 | return get_serial_info(tty, info, argp); |
1da177e4 | 1237 | case TIOCSSERIAL: |
588993dd | 1238 | return set_serial_info(tty, info, argp); |
1da177e4 LT |
1239 | case TIOCSERCONFIG: |
1240 | return 0; | |
1241 | ||
1242 | case TIOCSERGETLSR: /* Get line status register */ | |
ab14caec | 1243 | return get_lsr_info(info, argp); |
1da177e4 LT |
1244 | |
1245 | case TIOCSERGSTRUCT: | |
ab14caec | 1246 | if (copy_to_user(argp, |
916b7656 | 1247 | info, sizeof(struct serial_state))) |
1da177e4 LT |
1248 | return -EFAULT; |
1249 | return 0; | |
1250 | ||
1251 | /* | |
1252 | * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change | |
1253 | * - mask passed in arg for lines of interest | |
1254 | * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) | |
1255 | * Caller should use TIOCGICOUNT to see which one it was | |
1256 | */ | |
1257 | case TIOCMIWAIT: | |
1258 | local_irq_save(flags); | |
1259 | /* note the counters on entry */ | |
916b7656 | 1260 | cprev = info->icount; |
1da177e4 LT |
1261 | local_irq_restore(flags); |
1262 | while (1) { | |
591cee0a AB |
1263 | prepare_to_wait(&info->tport.delta_msr_wait, |
1264 | &wait, TASK_INTERRUPTIBLE); | |
1da177e4 | 1265 | local_irq_save(flags); |
916b7656 | 1266 | cnow = info->icount; /* atomic copy */ |
1da177e4 LT |
1267 | local_irq_restore(flags); |
1268 | if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && | |
591cee0a AB |
1269 | cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) { |
1270 | ret = -EIO; /* no change => error */ | |
1271 | break; | |
1272 | } | |
1da177e4 LT |
1273 | if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || |
1274 | ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || | |
1275 | ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || | |
1276 | ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) { | |
591cee0a AB |
1277 | ret = 0; |
1278 | break; | |
1279 | } | |
1280 | schedule(); | |
1281 | /* see if a signal did it */ | |
1282 | if (signal_pending(current)) { | |
1283 | ret = -ERESTARTSYS; | |
1284 | break; | |
1da177e4 LT |
1285 | } |
1286 | cprev = cnow; | |
1287 | } | |
591cee0a AB |
1288 | finish_wait(&info->tport.delta_msr_wait, &wait); |
1289 | return ret; | |
1da177e4 | 1290 | |
1da177e4 LT |
1291 | case TIOCSERGWILD: |
1292 | case TIOCSERSWILD: | |
1293 | /* "setserial -W" is called in Debian boot */ | |
1294 | printk ("TIOCSER?WILD ioctl obsolete, ignored.\n"); | |
1295 | return 0; | |
1296 | ||
1297 | default: | |
1298 | return -ENOIOCTLCMD; | |
1299 | } | |
1300 | return 0; | |
1301 | } | |
1302 | ||
606d099c | 1303 | static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios) |
1da177e4 | 1304 | { |
916b7656 | 1305 | struct serial_state *info = tty->driver_data; |
1da177e4 | 1306 | unsigned long flags; |
adc8d746 | 1307 | unsigned int cflag = tty->termios.c_cflag; |
1da177e4 | 1308 | |
588993dd | 1309 | change_speed(tty, info, old_termios); |
1da177e4 LT |
1310 | |
1311 | /* Handle transition to B0 status */ | |
9db276f8 | 1312 | if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) { |
1da177e4 LT |
1313 | info->MCR &= ~(SER_DTR|SER_RTS); |
1314 | local_irq_save(flags); | |
1315 | rtsdtr_ctrl(info->MCR); | |
1316 | local_irq_restore(flags); | |
1317 | } | |
1318 | ||
1319 | /* Handle transition away from B0 status */ | |
9db276f8 | 1320 | if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { |
1da177e4 | 1321 | info->MCR |= SER_DTR; |
97ef38b8 | 1322 | if (!C_CRTSCTS(tty) || !tty_throttled(tty)) |
1da177e4 | 1323 | info->MCR |= SER_RTS; |
1da177e4 LT |
1324 | local_irq_save(flags); |
1325 | rtsdtr_ctrl(info->MCR); | |
1326 | local_irq_restore(flags); | |
1327 | } | |
1328 | ||
1329 | /* Handle turning off CRTSCTS */ | |
9db276f8 | 1330 | if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) { |
1da177e4 LT |
1331 | tty->hw_stopped = 0; |
1332 | rs_start(tty); | |
1333 | } | |
1334 | ||
1335 | #if 0 | |
1336 | /* | |
1337 | * No need to wake up processes in open wait, since they | |
1338 | * sample the CLOCAL flag once, and don't recheck it. | |
1339 | * XXX It's not clear whether the current behavior is correct | |
1340 | * or not. Hence, this may change..... | |
1341 | */ | |
9db276f8 | 1342 | if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty)) |
1da177e4 LT |
1343 | wake_up_interruptible(&info->open_wait); |
1344 | #endif | |
1345 | } | |
1346 | ||
1347 | /* | |
1348 | * ------------------------------------------------------------ | |
1349 | * rs_close() | |
1350 | * | |
1351 | * This routine is called when the serial port gets closed. First, we | |
1352 | * wait for the last remaining data to be sent. Then, we unlink its | |
1353 | * async structure from the interrupt chain if necessary, and we free | |
1354 | * that IRQ if nothing is left in the chain. | |
1355 | * ------------------------------------------------------------ | |
1356 | */ | |
1357 | static void rs_close(struct tty_struct *tty, struct file * filp) | |
1358 | { | |
916b7656 | 1359 | struct serial_state *state = tty->driver_data; |
7188dc20 | 1360 | struct tty_port *port = &state->tport; |
1da177e4 | 1361 | |
9b937421 | 1362 | if (serial_paranoia_check(state, tty->name, "rs_close")) |
1da177e4 LT |
1363 | return; |
1364 | ||
9b937421 | 1365 | if (tty_port_close_start(port, tty, filp) == 0) |
1da177e4 | 1366 | return; |
1da177e4 | 1367 | |
1da177e4 LT |
1368 | /* |
1369 | * At this point we stop accepting input. To do this, we | |
1370 | * disable the receive line status interrupts, and tell the | |
1371 | * interrupt driver to stop checking the data ready bit in the | |
1372 | * line status register. | |
1373 | */ | |
916b7656 | 1374 | state->read_status_mask &= ~UART_LSR_DR; |
d41861ca | 1375 | if (tty_port_initialized(port)) { |
1da177e4 LT |
1376 | /* disable receive interrupts */ |
1377 | custom.intena = IF_RBF; | |
1378 | mb(); | |
1379 | /* clear any pending receive interrupt */ | |
1380 | custom.intreq = IF_RBF; | |
1381 | mb(); | |
1382 | ||
1383 | /* | |
1384 | * Before we drop DTR, make sure the UART transmitter | |
1385 | * has completely drained; this is especially | |
1386 | * important if there is a transmit FIFO! | |
1387 | */ | |
916b7656 | 1388 | rs_wait_until_sent(tty, state->timeout); |
1da177e4 | 1389 | } |
588993dd | 1390 | shutdown(tty, state); |
978e595f | 1391 | rs_flush_buffer(tty); |
1da177e4 LT |
1392 | |
1393 | tty_ldisc_flush(tty); | |
7188dc20 | 1394 | port->tty = NULL; |
b8edebe4 JS |
1395 | |
1396 | tty_port_close_end(port, tty); | |
1da177e4 LT |
1397 | } |
1398 | ||
1399 | /* | |
1400 | * rs_wait_until_sent() --- wait until the transmitter is empty | |
1401 | */ | |
1402 | static void rs_wait_until_sent(struct tty_struct *tty, int timeout) | |
1403 | { | |
916b7656 | 1404 | struct serial_state *info = tty->driver_data; |
1da177e4 LT |
1405 | unsigned long orig_jiffies, char_time; |
1406 | int lsr; | |
1407 | ||
1408 | if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent")) | |
1409 | return; | |
1410 | ||
916b7656 | 1411 | if (info->xmit_fifo_size == 0) |
1da177e4 LT |
1412 | return; /* Just in case.... */ |
1413 | ||
1414 | orig_jiffies = jiffies; | |
978e595f | 1415 | |
1da177e4 LT |
1416 | /* |
1417 | * Set the check interval to be 1/5 of the estimated time to | |
1418 | * send a single character, and make it at least 1. The check | |
1419 | * interval should also be less than the timeout. | |
1420 | * | |
1421 | * Note: we have to use pretty tight timings here to satisfy | |
1422 | * the NIST-PCTS. | |
1423 | */ | |
916b7656 | 1424 | char_time = (info->timeout - HZ/50) / info->xmit_fifo_size; |
1da177e4 LT |
1425 | char_time = char_time / 5; |
1426 | if (char_time == 0) | |
1427 | char_time = 1; | |
1428 | if (timeout) | |
1429 | char_time = min_t(unsigned long, char_time, timeout); | |
1430 | /* | |
1431 | * If the transmitter hasn't cleared in twice the approximate | |
1432 | * amount of time to send the entire FIFO, it probably won't | |
1433 | * ever clear. This assumes the UART isn't doing flow | |
1434 | * control, which is currently the case. Hence, if it ever | |
1435 | * takes longer than info->timeout, this is probably due to a | |
1436 | * UART bug of some kind. So, we clamp the timeout parameter at | |
1437 | * 2*info->timeout. | |
1438 | */ | |
1439 | if (!timeout || timeout > 2*info->timeout) | |
1440 | timeout = 2*info->timeout; | |
1441 | #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT | |
1442 | printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time); | |
1443 | printk("jiff=%lu...", jiffies); | |
1444 | #endif | |
1445 | while(!((lsr = custom.serdatr) & SDR_TSRE)) { | |
1446 | #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT | |
1447 | printk("serdatr = %d (jiff=%lu)...", lsr, jiffies); | |
1448 | #endif | |
1449 | msleep_interruptible(jiffies_to_msecs(char_time)); | |
1450 | if (signal_pending(current)) | |
1451 | break; | |
1452 | if (timeout && time_after(jiffies, orig_jiffies + timeout)) | |
1453 | break; | |
1454 | } | |
cc0a8fbb | 1455 | __set_current_state(TASK_RUNNING); |
eff4b0b9 | 1456 | |
1da177e4 LT |
1457 | #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT |
1458 | printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies); | |
1459 | #endif | |
1460 | } | |
1461 | ||
1462 | /* | |
1463 | * rs_hangup() --- called by tty_hangup() when a hangup is signaled. | |
1464 | */ | |
1465 | static void rs_hangup(struct tty_struct *tty) | |
1466 | { | |
916b7656 | 1467 | struct serial_state *info = tty->driver_data; |
1da177e4 LT |
1468 | |
1469 | if (serial_paranoia_check(info, tty->name, "rs_hangup")) | |
1470 | return; | |
1471 | ||
1da177e4 | 1472 | rs_flush_buffer(tty); |
588993dd | 1473 | shutdown(tty, info); |
12c80354 | 1474 | info->tport.count = 0; |
807c8d81 | 1475 | tty_port_set_active(&info->tport, 0); |
87758791 JS |
1476 | info->tport.tty = NULL; |
1477 | wake_up_interruptible(&info->tport.open_wait); | |
1da177e4 LT |
1478 | } |
1479 | ||
1da177e4 LT |
1480 | /* |
1481 | * This routine is called whenever a serial port is opened. It | |
1482 | * enables interrupts for a serial port, linking in its async structure into | |
1483 | * the IRQ chain. It also performs the serial-specific | |
1484 | * initialization for the tty structure. | |
1485 | */ | |
1486 | static int rs_open(struct tty_struct *tty, struct file * filp) | |
1487 | { | |
916b7656 | 1488 | struct serial_state *info = rs_table + tty->index; |
7188dc20 | 1489 | struct tty_port *port = &info->tport; |
410235fd | 1490 | int retval; |
1da177e4 | 1491 | |
7188dc20 JS |
1492 | port->count++; |
1493 | port->tty = tty; | |
916b7656 | 1494 | tty->driver_data = info; |
7188dc20 | 1495 | tty->port = port; |
1da177e4 LT |
1496 | if (serial_paranoia_check(info, tty->name, "rs_open")) |
1497 | return -ENODEV; | |
1498 | ||
d6c53c0e | 1499 | port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0; |
1da177e4 | 1500 | |
588993dd | 1501 | retval = startup(tty, info); |
1da177e4 LT |
1502 | if (retval) { |
1503 | return retval; | |
1504 | } | |
1505 | ||
6e1aeb03 | 1506 | return tty_port_block_til_ready(port, tty, filp); |
1da177e4 LT |
1507 | } |
1508 | ||
1509 | /* | |
1510 | * /proc fs routines.... | |
1511 | */ | |
1512 | ||
ff169e5c JS |
1513 | static inline void line_info(struct seq_file *m, int line, |
1514 | struct serial_state *state) | |
1da177e4 | 1515 | { |
1da177e4 | 1516 | char stat_buf[30], control, status; |
1da177e4 LT |
1517 | unsigned long flags; |
1518 | ||
ff169e5c | 1519 | seq_printf(m, "%d: uart:amiga_builtin", line); |
1da177e4 | 1520 | |
1da177e4 LT |
1521 | local_irq_save(flags); |
1522 | status = ciab.pra; | |
d41861ca | 1523 | control = tty_port_initialized(&state->tport) ? state->MCR : status; |
1da177e4 LT |
1524 | local_irq_restore(flags); |
1525 | ||
1526 | stat_buf[0] = 0; | |
1527 | stat_buf[1] = 0; | |
1528 | if(!(control & SER_RTS)) | |
1529 | strcat(stat_buf, "|RTS"); | |
1530 | if(!(status & SER_CTS)) | |
1531 | strcat(stat_buf, "|CTS"); | |
1532 | if(!(control & SER_DTR)) | |
1533 | strcat(stat_buf, "|DTR"); | |
1534 | if(!(status & SER_DSR)) | |
1535 | strcat(stat_buf, "|DSR"); | |
1536 | if(!(status & SER_DCD)) | |
1537 | strcat(stat_buf, "|CD"); | |
1538 | ||
916b7656 JS |
1539 | if (state->quot) |
1540 | seq_printf(m, " baud:%d", state->baud_base / state->quot); | |
1da177e4 | 1541 | |
d594027d | 1542 | seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx); |
1da177e4 LT |
1543 | |
1544 | if (state->icount.frame) | |
d594027d | 1545 | seq_printf(m, " fe:%d", state->icount.frame); |
1da177e4 LT |
1546 | |
1547 | if (state->icount.parity) | |
d594027d | 1548 | seq_printf(m, " pe:%d", state->icount.parity); |
1da177e4 LT |
1549 | |
1550 | if (state->icount.brk) | |
d594027d | 1551 | seq_printf(m, " brk:%d", state->icount.brk); |
1da177e4 LT |
1552 | |
1553 | if (state->icount.overrun) | |
d594027d | 1554 | seq_printf(m, " oe:%d", state->icount.overrun); |
1da177e4 LT |
1555 | |
1556 | /* | |
1557 | * Last thing is the RS-232 status lines | |
1558 | */ | |
d594027d | 1559 | seq_printf(m, " %s\n", stat_buf+1); |
1da177e4 LT |
1560 | } |
1561 | ||
d594027d | 1562 | static int rs_proc_show(struct seq_file *m, void *v) |
1da177e4 | 1563 | { |
d594027d | 1564 | seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version); |
ff169e5c | 1565 | line_info(m, 0, &rs_table[0]); |
d594027d | 1566 | return 0; |
1da177e4 LT |
1567 | } |
1568 | ||
1569 | /* | |
1570 | * --------------------------------------------------------------------- | |
1571 | * rs_init() and friends | |
1572 | * | |
1573 | * rs_init() is called at boot-time to initialize the serial driver. | |
1574 | * --------------------------------------------------------------------- | |
1575 | */ | |
1576 | ||
1577 | /* | |
1578 | * This routine prints out the appropriate serial driver version | |
1579 | * number, and identifies which options were configured into this | |
1580 | * driver. | |
1581 | */ | |
41c28ff1 | 1582 | static void show_serial_version(void) |
1da177e4 LT |
1583 | { |
1584 | printk(KERN_INFO "%s version %s\n", serial_name, serial_version); | |
1585 | } | |
1586 | ||
1587 | ||
b68e31d0 | 1588 | static const struct tty_operations serial_ops = { |
1da177e4 LT |
1589 | .open = rs_open, |
1590 | .close = rs_close, | |
1591 | .write = rs_write, | |
1592 | .put_char = rs_put_char, | |
1593 | .flush_chars = rs_flush_chars, | |
1594 | .write_room = rs_write_room, | |
1595 | .chars_in_buffer = rs_chars_in_buffer, | |
1596 | .flush_buffer = rs_flush_buffer, | |
1597 | .ioctl = rs_ioctl, | |
1598 | .throttle = rs_throttle, | |
1599 | .unthrottle = rs_unthrottle, | |
1600 | .set_termios = rs_set_termios, | |
1601 | .stop = rs_stop, | |
1602 | .start = rs_start, | |
1603 | .hangup = rs_hangup, | |
1604 | .break_ctl = rs_break, | |
1605 | .send_xchar = rs_send_xchar, | |
1606 | .wait_until_sent = rs_wait_until_sent, | |
1da177e4 LT |
1607 | .tiocmget = rs_tiocmget, |
1608 | .tiocmset = rs_tiocmset, | |
0587102c | 1609 | .get_icount = rs_get_icount, |
8a8dcabf | 1610 | .proc_show = rs_proc_show, |
1da177e4 LT |
1611 | }; |
1612 | ||
f1166604 JS |
1613 | static int amiga_carrier_raised(struct tty_port *port) |
1614 | { | |
1615 | return !(ciab.pra & SER_DCD); | |
1616 | } | |
1617 | ||
1618 | static void amiga_dtr_rts(struct tty_port *port, int raise) | |
1619 | { | |
1620 | struct serial_state *info = container_of(port, struct serial_state, | |
1621 | tport); | |
1622 | unsigned long flags; | |
1623 | ||
1624 | if (raise) | |
1625 | info->MCR |= SER_DTR|SER_RTS; | |
1626 | else | |
1627 | info->MCR &= ~(SER_DTR|SER_RTS); | |
1628 | ||
1629 | local_irq_save(flags); | |
1630 | rtsdtr_ctrl(info->MCR); | |
1631 | local_irq_restore(flags); | |
1632 | } | |
1633 | ||
1634 | static const struct tty_port_operations amiga_port_ops = { | |
1635 | .carrier_raised = amiga_carrier_raised, | |
1636 | .dtr_rts = amiga_dtr_rts, | |
1637 | }; | |
1638 | ||
1da177e4 LT |
1639 | /* |
1640 | * The serial driver boot-time initialization code! | |
1641 | */ | |
826e8c8c | 1642 | static int __init amiga_serial_probe(struct platform_device *pdev) |
1da177e4 LT |
1643 | { |
1644 | unsigned long flags; | |
1645 | struct serial_state * state; | |
5edc304f | 1646 | int error; |
1da177e4 | 1647 | |
410235fd | 1648 | serial_driver = alloc_tty_driver(NR_PORTS); |
1da177e4 LT |
1649 | if (!serial_driver) |
1650 | return -ENOMEM; | |
1651 | ||
1da177e4 LT |
1652 | show_serial_version(); |
1653 | ||
1654 | /* Initialize the tty_driver structure */ | |
1655 | ||
1da177e4 LT |
1656 | serial_driver->driver_name = "amiserial"; |
1657 | serial_driver->name = "ttyS"; | |
1658 | serial_driver->major = TTY_MAJOR; | |
1659 | serial_driver->minor_start = 64; | |
1660 | serial_driver->type = TTY_DRIVER_TYPE_SERIAL; | |
1661 | serial_driver->subtype = SERIAL_TYPE_NORMAL; | |
1662 | serial_driver->init_termios = tty_std_termios; | |
1663 | serial_driver->init_termios.c_cflag = | |
1664 | B9600 | CS8 | CREAD | HUPCL | CLOCAL; | |
1665 | serial_driver->flags = TTY_DRIVER_REAL_RAW; | |
1666 | tty_set_operations(serial_driver, &serial_ops); | |
1667 | ||
1da177e4 | 1668 | state = rs_table; |
1da177e4 | 1669 | state->port = (int)&custom.serdatr; /* Just to give it a value */ |
1da177e4 | 1670 | state->custom_divisor = 0; |
1da177e4 LT |
1671 | state->icount.cts = state->icount.dsr = |
1672 | state->icount.rng = state->icount.dcd = 0; | |
1673 | state->icount.rx = state->icount.tx = 0; | |
1674 | state->icount.frame = state->icount.parity = 0; | |
1675 | state->icount.overrun = state->icount.brk = 0; | |
87758791 | 1676 | tty_port_init(&state->tport); |
f1166604 | 1677 | state->tport.ops = &amiga_port_ops; |
b19e2ca7 JS |
1678 | tty_port_link_device(&state->tport, serial_driver, 0); |
1679 | ||
1680 | error = tty_register_driver(serial_driver); | |
1681 | if (error) | |
1682 | goto fail_put_tty_driver; | |
1da177e4 | 1683 | |
ff169e5c | 1684 | printk(KERN_INFO "ttyS0 is the amiga builtin serial port\n"); |
1da177e4 LT |
1685 | |
1686 | /* Hardware set up */ | |
1687 | ||
1688 | state->baud_base = amiga_colorclock; | |
1689 | state->xmit_fifo_size = 1; | |
1690 | ||
1da177e4 | 1691 | /* set ISRs, and then disable the rx interrupts */ |
5edc304f GU |
1692 | error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state); |
1693 | if (error) | |
1694 | goto fail_unregister; | |
1695 | ||
9cfb5c05 | 1696 | error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0, |
5edc304f GU |
1697 | "serial RX", state); |
1698 | if (error) | |
1699 | goto fail_free_irq; | |
1da177e4 | 1700 | |
c70c036f JL |
1701 | local_irq_save(flags); |
1702 | ||
1da177e4 LT |
1703 | /* turn off Rx and Tx interrupts */ |
1704 | custom.intena = IF_RBF | IF_TBE; | |
1705 | mb(); | |
1706 | ||
1707 | /* clear any pending interrupt */ | |
1708 | custom.intreq = IF_RBF | IF_TBE; | |
1709 | mb(); | |
1710 | ||
1711 | local_irq_restore(flags); | |
1712 | ||
1713 | /* | |
1714 | * set the appropriate directions for the modem control flags, | |
1715 | * and clear RTS and DTR | |
1716 | */ | |
1717 | ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */ | |
1718 | ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */ | |
1719 | ||
826e8c8c GU |
1720 | platform_set_drvdata(pdev, state); |
1721 | ||
1da177e4 | 1722 | return 0; |
5edc304f GU |
1723 | |
1724 | fail_free_irq: | |
1725 | free_irq(IRQ_AMIGA_TBE, state); | |
1726 | fail_unregister: | |
1727 | tty_unregister_driver(serial_driver); | |
5edc304f | 1728 | fail_put_tty_driver: |
191c5f10 | 1729 | tty_port_destroy(&state->tport); |
5edc304f GU |
1730 | put_tty_driver(serial_driver); |
1731 | return error; | |
1da177e4 LT |
1732 | } |
1733 | ||
826e8c8c | 1734 | static int __exit amiga_serial_remove(struct platform_device *pdev) |
1da177e4 LT |
1735 | { |
1736 | int error; | |
826e8c8c | 1737 | struct serial_state *state = platform_get_drvdata(pdev); |
1da177e4 LT |
1738 | |
1739 | /* printk("Unloading %s: version %s\n", serial_name, serial_version); */ | |
2eeaf0bb GKH |
1740 | error = tty_unregister_driver(serial_driver); |
1741 | if (error) | |
1da177e4 LT |
1742 | printk("SERIAL: failed to unregister serial driver (%d)\n", |
1743 | error); | |
1744 | put_tty_driver(serial_driver); | |
191c5f10 | 1745 | tty_port_destroy(&state->tport); |
1da177e4 | 1746 | |
916b7656 JS |
1747 | free_irq(IRQ_AMIGA_TBE, state); |
1748 | free_irq(IRQ_AMIGA_RBF, state); | |
5edc304f | 1749 | |
826e8c8c GU |
1750 | return error; |
1751 | } | |
1752 | ||
1753 | static struct platform_driver amiga_serial_driver = { | |
1754 | .remove = __exit_p(amiga_serial_remove), | |
1755 | .driver = { | |
1756 | .name = "amiga-serial", | |
826e8c8c GU |
1757 | }, |
1758 | }; | |
1759 | ||
fec6bee3 | 1760 | module_platform_driver_probe(amiga_serial_driver, amiga_serial_probe); |
1da177e4 LT |
1761 | |
1762 | ||
d1a35e4d GU |
1763 | #if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE) |
1764 | ||
1da177e4 LT |
1765 | /* |
1766 | * ------------------------------------------------------------ | |
1767 | * Serial console driver | |
1768 | * ------------------------------------------------------------ | |
1769 | */ | |
1da177e4 LT |
1770 | |
1771 | static void amiga_serial_putc(char c) | |
1772 | { | |
1773 | custom.serdat = (unsigned char)c | 0x100; | |
1774 | while (!(custom.serdatr & 0x2000)) | |
1775 | barrier(); | |
1776 | } | |
1777 | ||
1778 | /* | |
1779 | * Print a string to the serial port trying not to disturb | |
1780 | * any possible real use of the port... | |
1781 | * | |
1782 | * The console must be locked when we get here. | |
1783 | */ | |
1784 | static void serial_console_write(struct console *co, const char *s, | |
1785 | unsigned count) | |
1786 | { | |
1787 | unsigned short intena = custom.intenar; | |
1788 | ||
1789 | custom.intena = IF_TBE; | |
1790 | ||
1791 | while (count--) { | |
1792 | if (*s == '\n') | |
1793 | amiga_serial_putc('\r'); | |
1794 | amiga_serial_putc(*s++); | |
1795 | } | |
1796 | ||
1797 | custom.intena = IF_SETCLR | (intena & IF_TBE); | |
1798 | } | |
1799 | ||
1800 | static struct tty_driver *serial_console_device(struct console *c, int *index) | |
1801 | { | |
1802 | *index = 0; | |
1803 | return serial_driver; | |
1804 | } | |
1805 | ||
1806 | static struct console sercons = { | |
1807 | .name = "ttyS", | |
1808 | .write = serial_console_write, | |
1809 | .device = serial_console_device, | |
1810 | .flags = CON_PRINTBUFFER, | |
1811 | .index = -1, | |
1812 | }; | |
1813 | ||
1814 | /* | |
1815 | * Register console. | |
1816 | */ | |
1817 | static int __init amiserial_console_init(void) | |
1818 | { | |
3dcf344b GU |
1819 | if (!MACH_IS_AMIGA) |
1820 | return -ENODEV; | |
1821 | ||
1da177e4 LT |
1822 | register_console(&sercons); |
1823 | return 0; | |
1824 | } | |
1825 | console_initcall(amiserial_console_init); | |
d1a35e4d GU |
1826 | |
1827 | #endif /* CONFIG_SERIAL_CONSOLE && !MODULE */ | |
1da177e4 LT |
1828 | |
1829 | MODULE_LICENSE("GPL"); | |
826e8c8c | 1830 | MODULE_ALIAS("platform:amiga-serial"); |