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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 | ||
1da177e4 LT |
25 | #include <linux/delay.h> |
26 | ||
1da177e4 LT |
27 | /* Set of debugging defines */ |
28 | ||
29 | #undef SERIAL_DEBUG_INTR | |
30 | #undef SERIAL_DEBUG_OPEN | |
31 | #undef SERIAL_DEBUG_FLOW | |
32 | #undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT | |
33 | ||
34 | /* Sanity checks */ | |
35 | ||
1da177e4 LT |
36 | #if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT) |
37 | #define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \ | |
01bd730d | 38 | tty->name, (info->tport.flags), serial_driver->refcount,info->count,tty->count,s) |
1da177e4 LT |
39 | #else |
40 | #define DBG_CNT(s) | |
41 | #endif | |
42 | ||
43 | /* | |
44 | * End of serial driver configuration section. | |
45 | */ | |
46 | ||
47 | #include <linux/module.h> | |
48 | ||
49 | #include <linux/types.h> | |
50 | #include <linux/serial.h> | |
1da177e4 LT |
51 | #include <linux/serial_reg.h> |
52 | static char *serial_version = "4.30"; | |
53 | ||
54 | #include <linux/errno.h> | |
55 | #include <linux/signal.h> | |
56 | #include <linux/sched.h> | |
57 | #include <linux/kernel.h> | |
58 | #include <linux/timer.h> | |
59 | #include <linux/interrupt.h> | |
60 | #include <linux/tty.h> | |
61 | #include <linux/tty_flip.h> | |
6fe18d26 | 62 | #include <linux/circ_buf.h> |
1da177e4 LT |
63 | #include <linux/console.h> |
64 | #include <linux/major.h> | |
65 | #include <linux/string.h> | |
66 | #include <linux/fcntl.h> | |
67 | #include <linux/ptrace.h> | |
68 | #include <linux/ioport.h> | |
69 | #include <linux/mm.h> | |
d594027d | 70 | #include <linux/seq_file.h> |
1da177e4 LT |
71 | #include <linux/slab.h> |
72 | #include <linux/init.h> | |
73 | #include <linux/bitops.h> | |
826e8c8c | 74 | #include <linux/platform_device.h> |
1da177e4 LT |
75 | |
76 | #include <asm/setup.h> | |
77 | ||
1da177e4 LT |
78 | |
79 | #include <asm/irq.h> | |
80 | ||
81 | #include <asm/amigahw.h> | |
82 | #include <asm/amigaints.h> | |
83 | ||
6fe18d26 JS |
84 | struct serial_state { |
85 | struct tty_port tport; | |
86 | struct circ_buf xmit; | |
87 | struct async_icount icount; | |
88 | ||
89 | unsigned long port; | |
90 | int baud_base; | |
91 | int xmit_fifo_size; | |
92 | int custom_divisor; | |
93 | int read_status_mask; | |
94 | int ignore_status_mask; | |
95 | int timeout; | |
96 | int quot; | |
97 | int IER; /* Interrupt Enable Register */ | |
98 | int MCR; /* Modem control register */ | |
99 | int x_char; /* xon/xoff character */ | |
100 | }; | |
101 | ||
b4290a23 | 102 | #define custom amiga_custom |
1da177e4 LT |
103 | static char *serial_name = "Amiga-builtin serial driver"; |
104 | ||
105 | static struct tty_driver *serial_driver; | |
106 | ||
107 | /* number of characters left in xmit buffer before we ask for more */ | |
108 | #define WAKEUP_CHARS 256 | |
109 | ||
1da177e4 LT |
110 | static unsigned char current_ctl_bits; |
111 | ||
588993dd JS |
112 | static void change_speed(struct tty_struct *tty, struct serial_state *info, |
113 | struct ktermios *old); | |
1da177e4 LT |
114 | static void rs_wait_until_sent(struct tty_struct *tty, int timeout); |
115 | ||
116 | ||
117 | static struct serial_state rs_table[1]; | |
118 | ||
fe971071 | 119 | #define NR_PORTS ARRAY_SIZE(rs_table) |
1da177e4 | 120 | |
7c0f6ba6 | 121 | #include <linux/uaccess.h> |
1da177e4 LT |
122 | |
123 | #define serial_isroot() (capable(CAP_SYS_ADMIN)) | |
124 | ||
1da177e4 LT |
125 | /* some serial hardware definitions */ |
126 | #define SDR_OVRUN (1<<15) | |
127 | #define SDR_RBF (1<<14) | |
128 | #define SDR_TBE (1<<13) | |
129 | #define SDR_TSRE (1<<12) | |
130 | ||
131 | #define SERPER_PARENB (1<<15) | |
132 | ||
133 | #define AC_SETCLR (1<<15) | |
134 | #define AC_UARTBRK (1<<11) | |
135 | ||
136 | #define SER_DTR (1<<7) | |
137 | #define SER_RTS (1<<6) | |
138 | #define SER_DCD (1<<5) | |
139 | #define SER_CTS (1<<4) | |
140 | #define SER_DSR (1<<3) | |
141 | ||
142 | static __inline__ void rtsdtr_ctrl(int bits) | |
143 | { | |
144 | ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR)); | |
145 | } | |
146 | ||
147 | /* | |
148 | * ------------------------------------------------------------ | |
149 | * rs_stop() and rs_start() | |
150 | * | |
151 | * This routines are called before setting or resetting tty->stopped. | |
152 | * They enable or disable transmitter interrupts, as necessary. | |
153 | * ------------------------------------------------------------ | |
154 | */ | |
155 | static void rs_stop(struct tty_struct *tty) | |
156 | { | |
916b7656 | 157 | struct serial_state *info = tty->driver_data; |
1da177e4 LT |
158 | unsigned long flags; |
159 | ||
1da177e4 LT |
160 | local_irq_save(flags); |
161 | if (info->IER & UART_IER_THRI) { | |
162 | info->IER &= ~UART_IER_THRI; | |
163 | /* disable Tx interrupt and remove any pending interrupts */ | |
164 | custom.intena = IF_TBE; | |
165 | mb(); | |
166 | custom.intreq = IF_TBE; | |
167 | mb(); | |
168 | } | |
169 | local_irq_restore(flags); | |
170 | } | |
171 | ||
172 | static void rs_start(struct tty_struct *tty) | |
173 | { | |
916b7656 | 174 | struct serial_state *info = tty->driver_data; |
1da177e4 LT |
175 | unsigned long flags; |
176 | ||
1da177e4 LT |
177 | local_irq_save(flags); |
178 | if (info->xmit.head != info->xmit.tail | |
179 | && info->xmit.buf | |
180 | && !(info->IER & UART_IER_THRI)) { | |
181 | info->IER |= UART_IER_THRI; | |
182 | custom.intena = IF_SETCLR | IF_TBE; | |
183 | mb(); | |
184 | /* set a pending Tx Interrupt, transmitter should restart now */ | |
185 | custom.intreq = IF_SETCLR | IF_TBE; | |
186 | mb(); | |
187 | } | |
188 | local_irq_restore(flags); | |
189 | } | |
190 | ||
191 | /* | |
192 | * ---------------------------------------------------------------------- | |
193 | * | |
194 | * Here starts the interrupt handling routines. All of the following | |
195 | * subroutines are declared as inline and are folded into | |
196 | * rs_interrupt(). They were separated out for readability's sake. | |
197 | * | |
198 | * Note: rs_interrupt() is a "fast" interrupt, which means that it | |
199 | * runs with interrupts turned off. People who may want to modify | |
200 | * rs_interrupt() should try to keep the interrupt handler as fast as | |
201 | * possible. After you are done making modifications, it is not a bad | |
202 | * idea to do: | |
203 | * | |
204 | * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c | |
205 | * | |
206 | * and look at the resulting assemble code in serial.s. | |
207 | * | |
208 | * - Ted Ts'o (tytso@mit.edu), 7-Mar-93 | |
209 | * ----------------------------------------------------------------------- | |
210 | */ | |
211 | ||
916b7656 | 212 | static void receive_chars(struct serial_state *info) |
1da177e4 LT |
213 | { |
214 | int status; | |
215 | int serdatr; | |
33f0f88f | 216 | unsigned char ch, flag; |
1da177e4 | 217 | struct async_icount *icount; |
33f0f88f | 218 | int oe = 0; |
1da177e4 | 219 | |
916b7656 | 220 | icount = &info->icount; |
1da177e4 LT |
221 | |
222 | status = UART_LSR_DR; /* We obviously have a character! */ | |
223 | serdatr = custom.serdatr; | |
224 | mb(); | |
225 | custom.intreq = IF_RBF; | |
226 | mb(); | |
227 | ||
228 | if((serdatr & 0x1ff) == 0) | |
229 | status |= UART_LSR_BI; | |
230 | if(serdatr & SDR_OVRUN) | |
231 | status |= UART_LSR_OE; | |
232 | ||
233 | ch = serdatr & 0xff; | |
1da177e4 LT |
234 | icount->rx++; |
235 | ||
236 | #ifdef SERIAL_DEBUG_INTR | |
237 | printk("DR%02x:%02x...", ch, status); | |
238 | #endif | |
33f0f88f | 239 | flag = TTY_NORMAL; |
1da177e4 LT |
240 | |
241 | /* | |
242 | * We don't handle parity or frame errors - but I have left | |
243 | * the code in, since I'm not sure that the errors can't be | |
244 | * detected. | |
245 | */ | |
246 | ||
247 | if (status & (UART_LSR_BI | UART_LSR_PE | | |
248 | UART_LSR_FE | UART_LSR_OE)) { | |
249 | /* | |
250 | * For statistics only | |
251 | */ | |
252 | if (status & UART_LSR_BI) { | |
253 | status &= ~(UART_LSR_FE | UART_LSR_PE); | |
254 | icount->brk++; | |
255 | } else if (status & UART_LSR_PE) | |
256 | icount->parity++; | |
257 | else if (status & UART_LSR_FE) | |
258 | icount->frame++; | |
259 | if (status & UART_LSR_OE) | |
260 | icount->overrun++; | |
261 | ||
262 | /* | |
263 | * Now check to see if character should be | |
264 | * ignored, and mask off conditions which | |
265 | * should be ignored. | |
266 | */ | |
267 | if (status & info->ignore_status_mask) | |
33f0f88f | 268 | goto out; |
1da177e4 LT |
269 | |
270 | status &= info->read_status_mask; | |
271 | ||
272 | if (status & (UART_LSR_BI)) { | |
273 | #ifdef SERIAL_DEBUG_INTR | |
274 | printk("handling break...."); | |
275 | #endif | |
33f0f88f | 276 | flag = TTY_BREAK; |
01bd730d | 277 | if (info->tport.flags & ASYNC_SAK) |
2e124b4a | 278 | do_SAK(info->tport.tty); |
1da177e4 | 279 | } else if (status & UART_LSR_PE) |
33f0f88f | 280 | flag = TTY_PARITY; |
1da177e4 | 281 | else if (status & UART_LSR_FE) |
33f0f88f | 282 | flag = TTY_FRAME; |
1da177e4 LT |
283 | if (status & UART_LSR_OE) { |
284 | /* | |
285 | * Overrun is special, since it's | |
286 | * reported immediately, and doesn't | |
287 | * affect the current character | |
288 | */ | |
33f0f88f | 289 | oe = 1; |
1da177e4 LT |
290 | } |
291 | } | |
92a19f9c | 292 | tty_insert_flip_char(&info->tport, ch, flag); |
33f0f88f | 293 | if (oe == 1) |
92a19f9c | 294 | tty_insert_flip_char(&info->tport, 0, TTY_OVERRUN); |
2e124b4a | 295 | tty_flip_buffer_push(&info->tport); |
33f0f88f AC |
296 | out: |
297 | return; | |
1da177e4 LT |
298 | } |
299 | ||
916b7656 | 300 | static void transmit_chars(struct serial_state *info) |
1da177e4 LT |
301 | { |
302 | custom.intreq = IF_TBE; | |
303 | mb(); | |
304 | if (info->x_char) { | |
305 | custom.serdat = info->x_char | 0x100; | |
306 | mb(); | |
916b7656 | 307 | info->icount.tx++; |
1da177e4 LT |
308 | info->x_char = 0; |
309 | return; | |
310 | } | |
311 | if (info->xmit.head == info->xmit.tail | |
87758791 JS |
312 | || info->tport.tty->stopped |
313 | || info->tport.tty->hw_stopped) { | |
1da177e4 LT |
314 | info->IER &= ~UART_IER_THRI; |
315 | custom.intena = IF_TBE; | |
316 | mb(); | |
317 | return; | |
318 | } | |
319 | ||
320 | custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100; | |
321 | mb(); | |
322 | info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1); | |
916b7656 | 323 | info->icount.tx++; |
1da177e4 LT |
324 | |
325 | if (CIRC_CNT(info->xmit.head, | |
326 | info->xmit.tail, | |
327 | SERIAL_XMIT_SIZE) < WAKEUP_CHARS) | |
87758791 | 328 | tty_wakeup(info->tport.tty); |
1da177e4 LT |
329 | |
330 | #ifdef SERIAL_DEBUG_INTR | |
331 | printk("THRE..."); | |
332 | #endif | |
333 | if (info->xmit.head == info->xmit.tail) { | |
334 | custom.intena = IF_TBE; | |
335 | mb(); | |
336 | info->IER &= ~UART_IER_THRI; | |
337 | } | |
338 | } | |
339 | ||
916b7656 | 340 | static void check_modem_status(struct serial_state *info) |
1da177e4 | 341 | { |
7188dc20 | 342 | struct tty_port *port = &info->tport; |
1da177e4 LT |
343 | unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR); |
344 | unsigned char dstatus; | |
345 | struct async_icount *icount; | |
346 | ||
347 | /* Determine bits that have changed */ | |
348 | dstatus = status ^ current_ctl_bits; | |
349 | current_ctl_bits = status; | |
350 | ||
351 | if (dstatus) { | |
916b7656 | 352 | icount = &info->icount; |
1da177e4 LT |
353 | /* update input line counters */ |
354 | if (dstatus & SER_DSR) | |
355 | icount->dsr++; | |
356 | if (dstatus & SER_DCD) { | |
357 | icount->dcd++; | |
1da177e4 LT |
358 | } |
359 | if (dstatus & SER_CTS) | |
360 | icount->cts++; | |
7188dc20 | 361 | wake_up_interruptible(&port->delta_msr_wait); |
1da177e4 LT |
362 | } |
363 | ||
2d68655d | 364 | if (tty_port_check_carrier(port) && (dstatus & SER_DCD)) { |
1da177e4 LT |
365 | #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR)) |
366 | printk("ttyS%d CD now %s...", info->line, | |
367 | (!(status & SER_DCD)) ? "on" : "off"); | |
368 | #endif | |
369 | if (!(status & SER_DCD)) | |
7188dc20 | 370 | wake_up_interruptible(&port->open_wait); |
1da177e4 LT |
371 | else { |
372 | #ifdef SERIAL_DEBUG_OPEN | |
373 | printk("doing serial hangup..."); | |
374 | #endif | |
7188dc20 JS |
375 | if (port->tty) |
376 | tty_hangup(port->tty); | |
1da177e4 LT |
377 | } |
378 | } | |
f21ec3d2 | 379 | if (tty_port_cts_enabled(port)) { |
7188dc20 | 380 | if (port->tty->hw_stopped) { |
1da177e4 LT |
381 | if (!(status & SER_CTS)) { |
382 | #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW)) | |
383 | printk("CTS tx start..."); | |
384 | #endif | |
7188dc20 | 385 | port->tty->hw_stopped = 0; |
1da177e4 LT |
386 | info->IER |= UART_IER_THRI; |
387 | custom.intena = IF_SETCLR | IF_TBE; | |
388 | mb(); | |
389 | /* set a pending Tx Interrupt, transmitter should restart now */ | |
390 | custom.intreq = IF_SETCLR | IF_TBE; | |
391 | mb(); | |
7188dc20 | 392 | tty_wakeup(port->tty); |
1da177e4 LT |
393 | return; |
394 | } | |
395 | } else { | |
396 | if ((status & SER_CTS)) { | |
397 | #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW)) | |
398 | printk("CTS tx stop..."); | |
399 | #endif | |
7188dc20 | 400 | port->tty->hw_stopped = 1; |
1da177e4 LT |
401 | info->IER &= ~UART_IER_THRI; |
402 | /* disable Tx interrupt and remove any pending interrupts */ | |
403 | custom.intena = IF_TBE; | |
404 | mb(); | |
405 | custom.intreq = IF_TBE; | |
406 | mb(); | |
407 | } | |
408 | } | |
409 | } | |
410 | } | |
411 | ||
7d12e780 | 412 | static irqreturn_t ser_vbl_int( int irq, void *data) |
1da177e4 LT |
413 | { |
414 | /* vbl is just a periodic interrupt we tie into to update modem status */ | |
916b7656 | 415 | struct serial_state *info = data; |
1da177e4 LT |
416 | /* |
417 | * TBD - is it better to unregister from this interrupt or to | |
418 | * ignore it if MSI is clear ? | |
419 | */ | |
420 | if(info->IER & UART_IER_MSI) | |
421 | check_modem_status(info); | |
422 | return IRQ_HANDLED; | |
423 | } | |
424 | ||
7d12e780 | 425 | static irqreturn_t ser_rx_int(int irq, void *dev_id) |
1da177e4 | 426 | { |
916b7656 | 427 | struct serial_state *info = dev_id; |
1da177e4 LT |
428 | |
429 | #ifdef SERIAL_DEBUG_INTR | |
430 | printk("ser_rx_int..."); | |
431 | #endif | |
432 | ||
87758791 | 433 | if (!info->tport.tty) |
1da177e4 LT |
434 | return IRQ_NONE; |
435 | ||
436 | receive_chars(info); | |
1da177e4 LT |
437 | #ifdef SERIAL_DEBUG_INTR |
438 | printk("end.\n"); | |
439 | #endif | |
440 | return IRQ_HANDLED; | |
441 | } | |
442 | ||
7d12e780 | 443 | static irqreturn_t ser_tx_int(int irq, void *dev_id) |
1da177e4 | 444 | { |
916b7656 | 445 | struct serial_state *info = dev_id; |
1da177e4 LT |
446 | |
447 | if (custom.serdatr & SDR_TBE) { | |
448 | #ifdef SERIAL_DEBUG_INTR | |
449 | printk("ser_tx_int..."); | |
450 | #endif | |
451 | ||
87758791 | 452 | if (!info->tport.tty) |
1da177e4 LT |
453 | return IRQ_NONE; |
454 | ||
455 | transmit_chars(info); | |
1da177e4 LT |
456 | #ifdef SERIAL_DEBUG_INTR |
457 | printk("end.\n"); | |
458 | #endif | |
459 | } | |
460 | return IRQ_HANDLED; | |
461 | } | |
462 | ||
463 | /* | |
464 | * ------------------------------------------------------------------- | |
465 | * Here ends the serial interrupt routines. | |
466 | * ------------------------------------------------------------------- | |
467 | */ | |
468 | ||
1da177e4 LT |
469 | /* |
470 | * --------------------------------------------------------------- | |
471 | * Low level utility subroutines for the serial driver: routines to | |
472 | * figure out the appropriate timeout for an interrupt chain, routines | |
473 | * to initialize and startup a serial port, and routines to shutdown a | |
474 | * serial port. Useful stuff like that. | |
475 | * --------------------------------------------------------------- | |
476 | */ | |
477 | ||
588993dd | 478 | static int startup(struct tty_struct *tty, struct serial_state *info) |
1da177e4 | 479 | { |
01bd730d | 480 | struct tty_port *port = &info->tport; |
1da177e4 LT |
481 | unsigned long flags; |
482 | int retval=0; | |
483 | unsigned long page; | |
484 | ||
485 | page = get_zeroed_page(GFP_KERNEL); | |
486 | if (!page) | |
487 | return -ENOMEM; | |
488 | ||
489 | local_irq_save(flags); | |
490 | ||
d41861ca | 491 | if (tty_port_initialized(port)) { |
1da177e4 LT |
492 | free_page(page); |
493 | goto errout; | |
494 | } | |
495 | ||
496 | if (info->xmit.buf) | |
497 | free_page(page); | |
498 | else | |
499 | info->xmit.buf = (unsigned char *) page; | |
500 | ||
501 | #ifdef SERIAL_DEBUG_OPEN | |
502 | printk("starting up ttys%d ...", info->line); | |
503 | #endif | |
504 | ||
505 | /* Clear anything in the input buffer */ | |
506 | ||
507 | custom.intreq = IF_RBF; | |
508 | mb(); | |
509 | ||
510 | retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info); | |
511 | if (retval) { | |
512 | if (serial_isroot()) { | |
588993dd | 513 | set_bit(TTY_IO_ERROR, &tty->flags); |
1da177e4 LT |
514 | retval = 0; |
515 | } | |
516 | goto errout; | |
517 | } | |
518 | ||
519 | /* enable both Rx and Tx interrupts */ | |
520 | custom.intena = IF_SETCLR | IF_RBF | IF_TBE; | |
521 | mb(); | |
522 | info->IER = UART_IER_MSI; | |
523 | ||
524 | /* remember current state of the DCD and CTS bits */ | |
525 | current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR); | |
526 | ||
1da177e4 | 527 | info->MCR = 0; |
588993dd | 528 | if (C_BAUD(tty)) |
1da177e4 LT |
529 | info->MCR = SER_DTR | SER_RTS; |
530 | rtsdtr_ctrl(info->MCR); | |
531 | ||
588993dd | 532 | clear_bit(TTY_IO_ERROR, &tty->flags); |
1da177e4 LT |
533 | info->xmit.head = info->xmit.tail = 0; |
534 | ||
1da177e4 LT |
535 | /* |
536 | * and set the speed of the serial port | |
537 | */ | |
588993dd | 538 | change_speed(tty, info, NULL); |
1da177e4 | 539 | |
d41861ca | 540 | tty_port_set_initialized(port, 1); |
1da177e4 LT |
541 | local_irq_restore(flags); |
542 | return 0; | |
543 | ||
544 | errout: | |
545 | local_irq_restore(flags); | |
546 | return retval; | |
547 | } | |
548 | ||
549 | /* | |
550 | * This routine will shutdown a serial port; interrupts are disabled, and | |
551 | * DTR is dropped if the hangup on close termio flag is on. | |
552 | */ | |
588993dd | 553 | static void shutdown(struct tty_struct *tty, struct serial_state *info) |
1da177e4 LT |
554 | { |
555 | unsigned long flags; | |
556 | struct serial_state *state; | |
557 | ||
d41861ca | 558 | if (!tty_port_initialized(&info->tport)) |
1da177e4 LT |
559 | return; |
560 | ||
916b7656 | 561 | state = info; |
1da177e4 LT |
562 | |
563 | #ifdef SERIAL_DEBUG_OPEN | |
564 | printk("Shutting down serial port %d ....\n", info->line); | |
565 | #endif | |
566 | ||
567 | local_irq_save(flags); /* Disable interrupts */ | |
568 | ||
569 | /* | |
570 | * clear delta_msr_wait queue to avoid mem leaks: we may free the irq | |
571 | * here so the queue might never be waken up | |
572 | */ | |
87758791 | 573 | wake_up_interruptible(&info->tport.delta_msr_wait); |
1da177e4 | 574 | |
1da177e4 LT |
575 | /* |
576 | * Free the IRQ, if necessary | |
577 | */ | |
578 | free_irq(IRQ_AMIGA_VERTB, info); | |
579 | ||
580 | if (info->xmit.buf) { | |
581 | free_page((unsigned long) info->xmit.buf); | |
582 | info->xmit.buf = NULL; | |
583 | } | |
584 | ||
585 | info->IER = 0; | |
586 | custom.intena = IF_RBF | IF_TBE; | |
587 | mb(); | |
588 | ||
589 | /* disable break condition */ | |
590 | custom.adkcon = AC_UARTBRK; | |
591 | mb(); | |
592 | ||
9db276f8 | 593 | if (C_HUPCL(tty)) |
1da177e4 LT |
594 | info->MCR &= ~(SER_DTR|SER_RTS); |
595 | rtsdtr_ctrl(info->MCR); | |
596 | ||
588993dd | 597 | set_bit(TTY_IO_ERROR, &tty->flags); |
1da177e4 | 598 | |
d41861ca | 599 | tty_port_set_initialized(&info->tport, 0); |
1da177e4 LT |
600 | local_irq_restore(flags); |
601 | } | |
602 | ||
603 | ||
604 | /* | |
605 | * This routine is called to set the UART divisor registers to match | |
606 | * the specified baud rate for a serial port. | |
607 | */ | |
588993dd | 608 | static void change_speed(struct tty_struct *tty, struct serial_state *info, |
606d099c | 609 | struct ktermios *old_termios) |
1da177e4 | 610 | { |
01bd730d | 611 | struct tty_port *port = &info->tport; |
1da177e4 LT |
612 | int quot = 0, baud_base, baud; |
613 | unsigned cflag, cval = 0; | |
614 | int bits; | |
615 | unsigned long flags; | |
616 | ||
adc8d746 | 617 | cflag = tty->termios.c_cflag; |
1da177e4 LT |
618 | |
619 | /* Byte size is always 8 bits plus parity bit if requested */ | |
620 | ||
621 | cval = 3; bits = 10; | |
622 | if (cflag & CSTOPB) { | |
623 | cval |= 0x04; | |
624 | bits++; | |
625 | } | |
626 | if (cflag & PARENB) { | |
627 | cval |= UART_LCR_PARITY; | |
628 | bits++; | |
629 | } | |
630 | if (!(cflag & PARODD)) | |
631 | cval |= UART_LCR_EPAR; | |
632 | #ifdef CMSPAR | |
633 | if (cflag & CMSPAR) | |
634 | cval |= UART_LCR_SPAR; | |
635 | #endif | |
636 | ||
637 | /* Determine divisor based on baud rate */ | |
588993dd | 638 | baud = tty_get_baud_rate(tty); |
1da177e4 LT |
639 | if (!baud) |
640 | baud = 9600; /* B0 transition handled in rs_set_termios */ | |
916b7656 | 641 | baud_base = info->baud_base; |
01bd730d | 642 | if (baud == 38400 && (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) |
916b7656 | 643 | quot = info->custom_divisor; |
1da177e4 LT |
644 | else { |
645 | if (baud == 134) | |
646 | /* Special case since 134 is really 134.5 */ | |
647 | quot = (2*baud_base / 269); | |
648 | else if (baud) | |
649 | quot = baud_base / baud; | |
650 | } | |
651 | /* If the quotient is zero refuse the change */ | |
652 | if (!quot && old_termios) { | |
db0ef08e | 653 | /* FIXME: Will need updating for new tty in the end */ |
adc8d746 AC |
654 | tty->termios.c_cflag &= ~CBAUD; |
655 | tty->termios.c_cflag |= (old_termios->c_cflag & CBAUD); | |
588993dd | 656 | baud = tty_get_baud_rate(tty); |
1da177e4 LT |
657 | if (!baud) |
658 | baud = 9600; | |
659 | if (baud == 38400 && | |
01bd730d | 660 | (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) |
916b7656 | 661 | quot = info->custom_divisor; |
1da177e4 LT |
662 | else { |
663 | if (baud == 134) | |
664 | /* Special case since 134 is really 134.5 */ | |
665 | quot = (2*baud_base / 269); | |
666 | else if (baud) | |
667 | quot = baud_base / baud; | |
668 | } | |
669 | } | |
670 | /* As a last resort, if the quotient is zero, default to 9600 bps */ | |
671 | if (!quot) | |
672 | quot = baud_base / 9600; | |
673 | info->quot = quot; | |
916b7656 | 674 | info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base); |
1da177e4 LT |
675 | info->timeout += HZ/50; /* Add .02 seconds of slop */ |
676 | ||
677 | /* CTS flow control flag and modem status interrupts */ | |
678 | info->IER &= ~UART_IER_MSI; | |
01bd730d | 679 | if (port->flags & ASYNC_HARDPPS_CD) |
1da177e4 | 680 | info->IER |= UART_IER_MSI; |
5604a98e PH |
681 | tty_port_set_cts_flow(port, cflag & CRTSCTS); |
682 | if (cflag & CRTSCTS) | |
1da177e4 | 683 | info->IER |= UART_IER_MSI; |
2d68655d PH |
684 | tty_port_set_check_carrier(port, ~cflag & CLOCAL); |
685 | if (~cflag & CLOCAL) | |
1da177e4 | 686 | info->IER |= UART_IER_MSI; |
1da177e4 | 687 | /* TBD: |
4b512d26 | 688 | * Does clearing IER_MSI imply that we should disable the VBL interrupt ? |
1da177e4 LT |
689 | */ |
690 | ||
691 | /* | |
692 | * Set up parity check flag | |
693 | */ | |
1da177e4 LT |
694 | |
695 | info->read_status_mask = UART_LSR_OE | UART_LSR_DR; | |
588993dd | 696 | if (I_INPCK(tty)) |
1da177e4 | 697 | info->read_status_mask |= UART_LSR_FE | UART_LSR_PE; |
588993dd | 698 | if (I_BRKINT(tty) || I_PARMRK(tty)) |
1da177e4 LT |
699 | info->read_status_mask |= UART_LSR_BI; |
700 | ||
701 | /* | |
702 | * Characters to ignore | |
703 | */ | |
704 | info->ignore_status_mask = 0; | |
588993dd | 705 | if (I_IGNPAR(tty)) |
1da177e4 | 706 | info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; |
588993dd | 707 | if (I_IGNBRK(tty)) { |
1da177e4 LT |
708 | info->ignore_status_mask |= UART_LSR_BI; |
709 | /* | |
710 | * If we're ignore parity and break indicators, ignore | |
711 | * overruns too. (For real raw support). | |
712 | */ | |
588993dd | 713 | if (I_IGNPAR(tty)) |
1da177e4 LT |
714 | info->ignore_status_mask |= UART_LSR_OE; |
715 | } | |
716 | /* | |
717 | * !!! ignore all characters if CREAD is not set | |
718 | */ | |
719 | if ((cflag & CREAD) == 0) | |
720 | info->ignore_status_mask |= UART_LSR_DR; | |
721 | local_irq_save(flags); | |
722 | ||
723 | { | |
724 | short serper; | |
725 | ||
726 | /* Set up the baud rate */ | |
727 | serper = quot - 1; | |
728 | ||
729 | /* Enable or disable parity bit */ | |
730 | ||
731 | if(cval & UART_LCR_PARITY) | |
732 | serper |= (SERPER_PARENB); | |
733 | ||
734 | custom.serper = serper; | |
735 | mb(); | |
736 | } | |
737 | ||
1da177e4 LT |
738 | local_irq_restore(flags); |
739 | } | |
740 | ||
257afa3c | 741 | static int rs_put_char(struct tty_struct *tty, unsigned char ch) |
1da177e4 | 742 | { |
916b7656 | 743 | struct serial_state *info; |
1da177e4 LT |
744 | unsigned long flags; |
745 | ||
d9ad7ef1 TJRMI |
746 | info = tty->driver_data; |
747 | ||
d9ad7ef1 | 748 | if (!info->xmit.buf) |
257afa3c | 749 | return 0; |
1da177e4 LT |
750 | |
751 | local_irq_save(flags); | |
752 | if (CIRC_SPACE(info->xmit.head, | |
753 | info->xmit.tail, | |
754 | SERIAL_XMIT_SIZE) == 0) { | |
755 | local_irq_restore(flags); | |
257afa3c | 756 | return 0; |
1da177e4 LT |
757 | } |
758 | ||
759 | info->xmit.buf[info->xmit.head++] = ch; | |
760 | info->xmit.head &= SERIAL_XMIT_SIZE-1; | |
761 | local_irq_restore(flags); | |
257afa3c | 762 | return 1; |
1da177e4 LT |
763 | } |
764 | ||
765 | static void rs_flush_chars(struct tty_struct *tty) | |
766 | { | |
916b7656 | 767 | struct serial_state *info = tty->driver_data; |
1da177e4 LT |
768 | unsigned long flags; |
769 | ||
1da177e4 LT |
770 | if (info->xmit.head == info->xmit.tail |
771 | || tty->stopped | |
772 | || tty->hw_stopped | |
773 | || !info->xmit.buf) | |
774 | return; | |
775 | ||
776 | local_irq_save(flags); | |
777 | info->IER |= UART_IER_THRI; | |
778 | custom.intena = IF_SETCLR | IF_TBE; | |
779 | mb(); | |
780 | /* set a pending Tx Interrupt, transmitter should restart now */ | |
781 | custom.intreq = IF_SETCLR | IF_TBE; | |
782 | mb(); | |
783 | local_irq_restore(flags); | |
784 | } | |
785 | ||
786 | static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count) | |
787 | { | |
788 | int c, ret = 0; | |
916b7656 | 789 | struct serial_state *info = tty->driver_data; |
1da177e4 LT |
790 | unsigned long flags; |
791 | ||
b3218a79 | 792 | if (!info->xmit.buf) |
1da177e4 LT |
793 | return 0; |
794 | ||
3abf3bed | 795 | local_irq_save(flags); |
1da177e4 LT |
796 | while (1) { |
797 | c = CIRC_SPACE_TO_END(info->xmit.head, | |
798 | info->xmit.tail, | |
799 | SERIAL_XMIT_SIZE); | |
800 | if (count < c) | |
801 | c = count; | |
802 | if (c <= 0) { | |
803 | break; | |
804 | } | |
805 | memcpy(info->xmit.buf + info->xmit.head, buf, c); | |
806 | info->xmit.head = ((info->xmit.head + c) & | |
807 | (SERIAL_XMIT_SIZE-1)); | |
808 | buf += c; | |
809 | count -= c; | |
810 | ret += c; | |
811 | } | |
812 | local_irq_restore(flags); | |
813 | ||
814 | if (info->xmit.head != info->xmit.tail | |
815 | && !tty->stopped | |
816 | && !tty->hw_stopped | |
817 | && !(info->IER & UART_IER_THRI)) { | |
818 | info->IER |= UART_IER_THRI; | |
819 | local_irq_disable(); | |
820 | custom.intena = IF_SETCLR | IF_TBE; | |
821 | mb(); | |
822 | /* set a pending Tx Interrupt, transmitter should restart now */ | |
823 | custom.intreq = IF_SETCLR | IF_TBE; | |
824 | mb(); | |
825 | local_irq_restore(flags); | |
826 | } | |
827 | return ret; | |
828 | } | |
829 | ||
830 | static int rs_write_room(struct tty_struct *tty) | |
831 | { | |
916b7656 | 832 | struct serial_state *info = tty->driver_data; |
1da177e4 | 833 | |
1da177e4 LT |
834 | return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); |
835 | } | |
836 | ||
837 | static int rs_chars_in_buffer(struct tty_struct *tty) | |
838 | { | |
916b7656 | 839 | struct serial_state *info = tty->driver_data; |
1da177e4 | 840 | |
1da177e4 LT |
841 | return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); |
842 | } | |
843 | ||
844 | static void rs_flush_buffer(struct tty_struct *tty) | |
845 | { | |
916b7656 | 846 | struct serial_state *info = tty->driver_data; |
1da177e4 LT |
847 | unsigned long flags; |
848 | ||
1da177e4 LT |
849 | local_irq_save(flags); |
850 | info->xmit.head = info->xmit.tail = 0; | |
851 | local_irq_restore(flags); | |
1da177e4 LT |
852 | tty_wakeup(tty); |
853 | } | |
854 | ||
855 | /* | |
856 | * This function is used to send a high-priority XON/XOFF character to | |
857 | * the device | |
858 | */ | |
859 | static void rs_send_xchar(struct tty_struct *tty, char ch) | |
860 | { | |
916b7656 | 861 | struct serial_state *info = tty->driver_data; |
1da177e4 LT |
862 | unsigned long flags; |
863 | ||
1da177e4 LT |
864 | info->x_char = ch; |
865 | if (ch) { | |
866 | /* Make sure transmit interrupts are on */ | |
867 | ||
868 | /* Check this ! */ | |
869 | local_irq_save(flags); | |
870 | if(!(custom.intenar & IF_TBE)) { | |
871 | custom.intena = IF_SETCLR | IF_TBE; | |
872 | mb(); | |
873 | /* set a pending Tx Interrupt, transmitter should restart now */ | |
874 | custom.intreq = IF_SETCLR | IF_TBE; | |
875 | mb(); | |
876 | } | |
877 | local_irq_restore(flags); | |
878 | ||
879 | info->IER |= UART_IER_THRI; | |
880 | } | |
881 | } | |
882 | ||
883 | /* | |
884 | * ------------------------------------------------------------ | |
885 | * rs_throttle() | |
886 | * | |
887 | * This routine is called by the upper-layer tty layer to signal that | |
888 | * incoming characters should be throttled. | |
889 | * ------------------------------------------------------------ | |
890 | */ | |
891 | static void rs_throttle(struct tty_struct * tty) | |
892 | { | |
916b7656 | 893 | struct serial_state *info = tty->driver_data; |
1da177e4 LT |
894 | unsigned long flags; |
895 | #ifdef SERIAL_DEBUG_THROTTLE | |
fdfb719e | 896 | printk("throttle %s ....\n", tty_name(tty)); |
1da177e4 LT |
897 | #endif |
898 | ||
1da177e4 LT |
899 | if (I_IXOFF(tty)) |
900 | rs_send_xchar(tty, STOP_CHAR(tty)); | |
901 | ||
9db276f8 | 902 | if (C_CRTSCTS(tty)) |
1da177e4 LT |
903 | info->MCR &= ~SER_RTS; |
904 | ||
905 | local_irq_save(flags); | |
906 | rtsdtr_ctrl(info->MCR); | |
907 | local_irq_restore(flags); | |
908 | } | |
909 | ||
910 | static void rs_unthrottle(struct tty_struct * tty) | |
911 | { | |
916b7656 | 912 | struct serial_state *info = tty->driver_data; |
1da177e4 LT |
913 | unsigned long flags; |
914 | #ifdef SERIAL_DEBUG_THROTTLE | |
fdfb719e | 915 | printk("unthrottle %s ....\n", tty_name(tty)); |
1da177e4 LT |
916 | #endif |
917 | ||
1da177e4 LT |
918 | if (I_IXOFF(tty)) { |
919 | if (info->x_char) | |
920 | info->x_char = 0; | |
921 | else | |
922 | rs_send_xchar(tty, START_CHAR(tty)); | |
923 | } | |
9db276f8 | 924 | if (C_CRTSCTS(tty)) |
1da177e4 LT |
925 | info->MCR |= SER_RTS; |
926 | local_irq_save(flags); | |
927 | rtsdtr_ctrl(info->MCR); | |
928 | local_irq_restore(flags); | |
929 | } | |
930 | ||
931 | /* | |
932 | * ------------------------------------------------------------ | |
933 | * rs_ioctl() and friends | |
934 | * ------------------------------------------------------------ | |
935 | */ | |
936 | ||
b129cbc9 | 937 | static int get_serial_info(struct tty_struct *tty, struct serial_struct *ss) |
1da177e4 | 938 | { |
b129cbc9 AV |
939 | struct serial_state *state = tty->driver_data; |
940 | ||
89c8d91e | 941 | tty_lock(tty); |
b129cbc9 AV |
942 | ss->line = tty->index; |
943 | ss->port = state->port; | |
944 | ss->flags = state->tport.flags; | |
945 | ss->xmit_fifo_size = state->xmit_fifo_size; | |
946 | ss->baud_base = state->baud_base; | |
947 | ss->close_delay = state->tport.close_delay; | |
948 | ss->closing_wait = state->tport.closing_wait; | |
949 | ss->custom_divisor = state->custom_divisor; | |
89c8d91e | 950 | tty_unlock(tty); |
1da177e4 LT |
951 | return 0; |
952 | } | |
953 | ||
b129cbc9 | 954 | static int set_serial_info(struct tty_struct *tty, struct serial_struct *ss) |
1da177e4 | 955 | { |
b129cbc9 | 956 | struct serial_state *state = tty->driver_data; |
01bd730d | 957 | struct tty_port *port = &state->tport; |
0f9b9684 | 958 | bool change_spd; |
1da177e4 LT |
959 | int retval = 0; |
960 | ||
89c8d91e | 961 | tty_lock(tty); |
b129cbc9 AV |
962 | change_spd = ((ss->flags ^ port->flags) & ASYNC_SPD_MASK) || |
963 | ss->custom_divisor != state->custom_divisor; | |
964 | if (ss->irq || ss->port != state->port || | |
965 | ss->xmit_fifo_size != state->xmit_fifo_size) { | |
89c8d91e | 966 | tty_unlock(tty); |
0f9b9684 | 967 | return -EINVAL; |
e18ce49b | 968 | } |
1da177e4 LT |
969 | |
970 | if (!serial_isroot()) { | |
b129cbc9 AV |
971 | if ((ss->baud_base != state->baud_base) || |
972 | (ss->close_delay != port->close_delay) || | |
abb6d296 | 973 | (ss->closing_wait != port->closing_wait) || |
b129cbc9 AV |
974 | (ss->xmit_fifo_size != state->xmit_fifo_size) || |
975 | ((ss->flags & ~ASYNC_USR_MASK) != | |
d3a7b83f | 976 | (port->flags & ~ASYNC_USR_MASK))) { |
89c8d91e | 977 | tty_unlock(tty); |
1da177e4 | 978 | return -EPERM; |
d3a7b83f | 979 | } |
01bd730d | 980 | port->flags = ((port->flags & ~ASYNC_USR_MASK) | |
b129cbc9 AV |
981 | (ss->flags & ASYNC_USR_MASK)); |
982 | state->custom_divisor = ss->custom_divisor; | |
1da177e4 LT |
983 | goto check_and_exit; |
984 | } | |
985 | ||
b129cbc9 | 986 | if (ss->baud_base < 9600) { |
89c8d91e | 987 | tty_unlock(tty); |
1da177e4 | 988 | return -EINVAL; |
e18ce49b | 989 | } |
1da177e4 LT |
990 | |
991 | /* | |
992 | * OK, past this point, all the error checking has been done. | |
993 | * At this point, we start making changes..... | |
994 | */ | |
995 | ||
b129cbc9 | 996 | state->baud_base = ss->baud_base; |
01bd730d | 997 | port->flags = ((port->flags & ~ASYNC_FLAGS) | |
b129cbc9 AV |
998 | (ss->flags & ASYNC_FLAGS)); |
999 | state->custom_divisor = ss->custom_divisor; | |
1000 | port->close_delay = ss->close_delay * HZ/100; | |
1001 | port->closing_wait = ss->closing_wait * HZ/100; | |
d6c53c0e | 1002 | port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0; |
1da177e4 LT |
1003 | |
1004 | check_and_exit: | |
d41861ca | 1005 | if (tty_port_initialized(port)) { |
0f9b9684 | 1006 | if (change_spd) { |
6086380a | 1007 | /* warn about deprecation unless clearing */ |
b129cbc9 | 1008 | if (ss->flags & ASYNC_SPD_MASK) |
6086380a | 1009 | dev_warn_ratelimited(tty->dev, "use of SPD flags is deprecated\n"); |
588993dd | 1010 | change_speed(tty, state, NULL); |
1da177e4 LT |
1011 | } |
1012 | } else | |
588993dd | 1013 | retval = startup(tty, state); |
89c8d91e | 1014 | tty_unlock(tty); |
1da177e4 LT |
1015 | return retval; |
1016 | } | |
1017 | ||
1da177e4 LT |
1018 | /* |
1019 | * get_lsr_info - get line status register info | |
1020 | * | |
1021 | * Purpose: Let user call ioctl() to get info when the UART physically | |
1022 | * is emptied. On bus types like RS485, the transmitter must | |
1023 | * release the bus after transmitting. This must be done when | |
1024 | * the transmit shift register is empty, not be done when the | |
1025 | * transmit holding register is empty. This functionality | |
1026 | * allows an RS485 driver to be written in user space. | |
1027 | */ | |
916b7656 | 1028 | static int get_lsr_info(struct serial_state *info, unsigned int __user *value) |
1da177e4 LT |
1029 | { |
1030 | unsigned char status; | |
1031 | unsigned int result; | |
1032 | unsigned long flags; | |
1033 | ||
1034 | local_irq_save(flags); | |
1035 | status = custom.serdatr; | |
1036 | mb(); | |
1037 | local_irq_restore(flags); | |
1038 | result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0); | |
1039 | if (copy_to_user(value, &result, sizeof(int))) | |
1040 | return -EFAULT; | |
1041 | return 0; | |
1042 | } | |
1043 | ||
1044 | ||
60b33c13 | 1045 | static int rs_tiocmget(struct tty_struct *tty) |
1da177e4 | 1046 | { |
916b7656 | 1047 | struct serial_state *info = tty->driver_data; |
1da177e4 LT |
1048 | unsigned char control, status; |
1049 | unsigned long flags; | |
1050 | ||
18900ca6 | 1051 | if (tty_io_error(tty)) |
1da177e4 LT |
1052 | return -EIO; |
1053 | ||
1054 | control = info->MCR; | |
1055 | local_irq_save(flags); | |
1056 | status = ciab.pra; | |
1057 | local_irq_restore(flags); | |
1058 | return ((control & SER_RTS) ? TIOCM_RTS : 0) | |
1059 | | ((control & SER_DTR) ? TIOCM_DTR : 0) | |
1060 | | (!(status & SER_DCD) ? TIOCM_CAR : 0) | |
1061 | | (!(status & SER_DSR) ? TIOCM_DSR : 0) | |
1062 | | (!(status & SER_CTS) ? TIOCM_CTS : 0); | |
1063 | } | |
1064 | ||
20b9d177 AC |
1065 | static int rs_tiocmset(struct tty_struct *tty, unsigned int set, |
1066 | unsigned int clear) | |
1da177e4 | 1067 | { |
916b7656 | 1068 | struct serial_state *info = tty->driver_data; |
1da177e4 LT |
1069 | unsigned long flags; |
1070 | ||
18900ca6 | 1071 | if (tty_io_error(tty)) |
1da177e4 LT |
1072 | return -EIO; |
1073 | ||
1074 | local_irq_save(flags); | |
1075 | if (set & TIOCM_RTS) | |
1076 | info->MCR |= SER_RTS; | |
1077 | if (set & TIOCM_DTR) | |
1078 | info->MCR |= SER_DTR; | |
1079 | if (clear & TIOCM_RTS) | |
1080 | info->MCR &= ~SER_RTS; | |
1081 | if (clear & TIOCM_DTR) | |
1082 | info->MCR &= ~SER_DTR; | |
1083 | rtsdtr_ctrl(info->MCR); | |
1084 | local_irq_restore(flags); | |
1085 | return 0; | |
1086 | } | |
1087 | ||
1088 | /* | |
1089 | * rs_break() --- routine which turns the break handling on or off | |
1090 | */ | |
9e98966c | 1091 | static int rs_break(struct tty_struct *tty, int break_state) |
1da177e4 | 1092 | { |
1da177e4 LT |
1093 | unsigned long flags; |
1094 | ||
1da177e4 LT |
1095 | local_irq_save(flags); |
1096 | if (break_state == -1) | |
1097 | custom.adkcon = AC_SETCLR | AC_UARTBRK; | |
1098 | else | |
1099 | custom.adkcon = AC_UARTBRK; | |
1100 | mb(); | |
1101 | local_irq_restore(flags); | |
9e98966c | 1102 | return 0; |
1da177e4 LT |
1103 | } |
1104 | ||
0587102c AC |
1105 | /* |
1106 | * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) | |
1107 | * Return: write counters to the user passed counter struct | |
1108 | * NB: both 1->0 and 0->1 transitions are counted except for | |
1109 | * RI where only 0->1 is counted. | |
1110 | */ | |
1111 | static int rs_get_icount(struct tty_struct *tty, | |
1112 | struct serial_icounter_struct *icount) | |
1113 | { | |
916b7656 | 1114 | struct serial_state *info = tty->driver_data; |
0587102c AC |
1115 | struct async_icount cnow; |
1116 | unsigned long flags; | |
1117 | ||
1118 | local_irq_save(flags); | |
916b7656 | 1119 | cnow = info->icount; |
0587102c AC |
1120 | local_irq_restore(flags); |
1121 | icount->cts = cnow.cts; | |
1122 | icount->dsr = cnow.dsr; | |
1123 | icount->rng = cnow.rng; | |
1124 | icount->dcd = cnow.dcd; | |
1125 | icount->rx = cnow.rx; | |
1126 | icount->tx = cnow.tx; | |
1127 | icount->frame = cnow.frame; | |
1128 | icount->overrun = cnow.overrun; | |
1129 | icount->parity = cnow.parity; | |
1130 | icount->brk = cnow.brk; | |
1131 | icount->buf_overrun = cnow.buf_overrun; | |
1132 | ||
1133 | return 0; | |
1134 | } | |
1da177e4 | 1135 | |
6caa76b7 | 1136 | static int rs_ioctl(struct tty_struct *tty, |
1da177e4 LT |
1137 | unsigned int cmd, unsigned long arg) |
1138 | { | |
916b7656 | 1139 | struct serial_state *info = tty->driver_data; |
1da177e4 | 1140 | struct async_icount cprev, cnow; /* kernel counter temps */ |
ab14caec | 1141 | void __user *argp = (void __user *)arg; |
1da177e4 | 1142 | unsigned long flags; |
591cee0a AB |
1143 | DEFINE_WAIT(wait); |
1144 | int ret; | |
1da177e4 | 1145 | |
ce5a9831 | 1146 | if ((cmd != TIOCSERCONFIG) && |
1da177e4 | 1147 | (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) { |
18900ca6 | 1148 | if (tty_io_error(tty)) |
1da177e4 LT |
1149 | return -EIO; |
1150 | } | |
1151 | ||
1152 | switch (cmd) { | |
1da177e4 LT |
1153 | case TIOCSERCONFIG: |
1154 | return 0; | |
1155 | ||
1156 | case TIOCSERGETLSR: /* Get line status register */ | |
ab14caec | 1157 | return get_lsr_info(info, argp); |
1da177e4 | 1158 | |
1da177e4 LT |
1159 | /* |
1160 | * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change | |
1161 | * - mask passed in arg for lines of interest | |
1162 | * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) | |
1163 | * Caller should use TIOCGICOUNT to see which one it was | |
1164 | */ | |
1165 | case TIOCMIWAIT: | |
1166 | local_irq_save(flags); | |
1167 | /* note the counters on entry */ | |
916b7656 | 1168 | cprev = info->icount; |
1da177e4 LT |
1169 | local_irq_restore(flags); |
1170 | while (1) { | |
591cee0a AB |
1171 | prepare_to_wait(&info->tport.delta_msr_wait, |
1172 | &wait, TASK_INTERRUPTIBLE); | |
1da177e4 | 1173 | local_irq_save(flags); |
916b7656 | 1174 | cnow = info->icount; /* atomic copy */ |
1da177e4 LT |
1175 | local_irq_restore(flags); |
1176 | if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && | |
591cee0a AB |
1177 | cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) { |
1178 | ret = -EIO; /* no change => error */ | |
1179 | break; | |
1180 | } | |
1da177e4 LT |
1181 | if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || |
1182 | ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || | |
1183 | ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || | |
1184 | ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) { | |
591cee0a AB |
1185 | ret = 0; |
1186 | break; | |
1187 | } | |
1188 | schedule(); | |
1189 | /* see if a signal did it */ | |
1190 | if (signal_pending(current)) { | |
1191 | ret = -ERESTARTSYS; | |
1192 | break; | |
1da177e4 LT |
1193 | } |
1194 | cprev = cnow; | |
1195 | } | |
591cee0a AB |
1196 | finish_wait(&info->tport.delta_msr_wait, &wait); |
1197 | return ret; | |
1da177e4 | 1198 | |
1da177e4 LT |
1199 | default: |
1200 | return -ENOIOCTLCMD; | |
1201 | } | |
1202 | return 0; | |
1203 | } | |
1204 | ||
606d099c | 1205 | static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios) |
1da177e4 | 1206 | { |
916b7656 | 1207 | struct serial_state *info = tty->driver_data; |
1da177e4 | 1208 | unsigned long flags; |
adc8d746 | 1209 | unsigned int cflag = tty->termios.c_cflag; |
1da177e4 | 1210 | |
588993dd | 1211 | change_speed(tty, info, old_termios); |
1da177e4 LT |
1212 | |
1213 | /* Handle transition to B0 status */ | |
9db276f8 | 1214 | if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) { |
1da177e4 LT |
1215 | info->MCR &= ~(SER_DTR|SER_RTS); |
1216 | local_irq_save(flags); | |
1217 | rtsdtr_ctrl(info->MCR); | |
1218 | local_irq_restore(flags); | |
1219 | } | |
1220 | ||
1221 | /* Handle transition away from B0 status */ | |
9db276f8 | 1222 | if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { |
1da177e4 | 1223 | info->MCR |= SER_DTR; |
97ef38b8 | 1224 | if (!C_CRTSCTS(tty) || !tty_throttled(tty)) |
1da177e4 | 1225 | info->MCR |= SER_RTS; |
1da177e4 LT |
1226 | local_irq_save(flags); |
1227 | rtsdtr_ctrl(info->MCR); | |
1228 | local_irq_restore(flags); | |
1229 | } | |
1230 | ||
1231 | /* Handle turning off CRTSCTS */ | |
9db276f8 | 1232 | if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) { |
1da177e4 LT |
1233 | tty->hw_stopped = 0; |
1234 | rs_start(tty); | |
1235 | } | |
1236 | ||
1237 | #if 0 | |
1238 | /* | |
1239 | * No need to wake up processes in open wait, since they | |
1240 | * sample the CLOCAL flag once, and don't recheck it. | |
1241 | * XXX It's not clear whether the current behavior is correct | |
1242 | * or not. Hence, this may change..... | |
1243 | */ | |
9db276f8 | 1244 | if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty)) |
1da177e4 LT |
1245 | wake_up_interruptible(&info->open_wait); |
1246 | #endif | |
1247 | } | |
1248 | ||
1249 | /* | |
1250 | * ------------------------------------------------------------ | |
1251 | * rs_close() | |
1252 | * | |
1253 | * This routine is called when the serial port gets closed. First, we | |
1254 | * wait for the last remaining data to be sent. Then, we unlink its | |
1255 | * async structure from the interrupt chain if necessary, and we free | |
1256 | * that IRQ if nothing is left in the chain. | |
1257 | * ------------------------------------------------------------ | |
1258 | */ | |
1259 | static void rs_close(struct tty_struct *tty, struct file * filp) | |
1260 | { | |
916b7656 | 1261 | struct serial_state *state = tty->driver_data; |
7188dc20 | 1262 | struct tty_port *port = &state->tport; |
1da177e4 | 1263 | |
9b937421 | 1264 | if (tty_port_close_start(port, tty, filp) == 0) |
1da177e4 | 1265 | return; |
1da177e4 | 1266 | |
1da177e4 LT |
1267 | /* |
1268 | * At this point we stop accepting input. To do this, we | |
1269 | * disable the receive line status interrupts, and tell the | |
1270 | * interrupt driver to stop checking the data ready bit in the | |
1271 | * line status register. | |
1272 | */ | |
916b7656 | 1273 | state->read_status_mask &= ~UART_LSR_DR; |
d41861ca | 1274 | if (tty_port_initialized(port)) { |
1da177e4 LT |
1275 | /* disable receive interrupts */ |
1276 | custom.intena = IF_RBF; | |
1277 | mb(); | |
1278 | /* clear any pending receive interrupt */ | |
1279 | custom.intreq = IF_RBF; | |
1280 | mb(); | |
1281 | ||
1282 | /* | |
1283 | * Before we drop DTR, make sure the UART transmitter | |
1284 | * has completely drained; this is especially | |
1285 | * important if there is a transmit FIFO! | |
1286 | */ | |
916b7656 | 1287 | rs_wait_until_sent(tty, state->timeout); |
1da177e4 | 1288 | } |
588993dd | 1289 | shutdown(tty, state); |
978e595f | 1290 | rs_flush_buffer(tty); |
1da177e4 LT |
1291 | |
1292 | tty_ldisc_flush(tty); | |
7188dc20 | 1293 | port->tty = NULL; |
b8edebe4 JS |
1294 | |
1295 | tty_port_close_end(port, tty); | |
1da177e4 LT |
1296 | } |
1297 | ||
1298 | /* | |
1299 | * rs_wait_until_sent() --- wait until the transmitter is empty | |
1300 | */ | |
1301 | static void rs_wait_until_sent(struct tty_struct *tty, int timeout) | |
1302 | { | |
916b7656 | 1303 | struct serial_state *info = tty->driver_data; |
1da177e4 LT |
1304 | unsigned long orig_jiffies, char_time; |
1305 | int lsr; | |
1306 | ||
916b7656 | 1307 | if (info->xmit_fifo_size == 0) |
1da177e4 LT |
1308 | return; /* Just in case.... */ |
1309 | ||
1310 | orig_jiffies = jiffies; | |
978e595f | 1311 | |
1da177e4 LT |
1312 | /* |
1313 | * Set the check interval to be 1/5 of the estimated time to | |
1314 | * send a single character, and make it at least 1. The check | |
1315 | * interval should also be less than the timeout. | |
1316 | * | |
1317 | * Note: we have to use pretty tight timings here to satisfy | |
1318 | * the NIST-PCTS. | |
1319 | */ | |
916b7656 | 1320 | char_time = (info->timeout - HZ/50) / info->xmit_fifo_size; |
1da177e4 LT |
1321 | char_time = char_time / 5; |
1322 | if (char_time == 0) | |
1323 | char_time = 1; | |
1324 | if (timeout) | |
1325 | char_time = min_t(unsigned long, char_time, timeout); | |
1326 | /* | |
1327 | * If the transmitter hasn't cleared in twice the approximate | |
1328 | * amount of time to send the entire FIFO, it probably won't | |
1329 | * ever clear. This assumes the UART isn't doing flow | |
1330 | * control, which is currently the case. Hence, if it ever | |
1331 | * takes longer than info->timeout, this is probably due to a | |
1332 | * UART bug of some kind. So, we clamp the timeout parameter at | |
1333 | * 2*info->timeout. | |
1334 | */ | |
1335 | if (!timeout || timeout > 2*info->timeout) | |
1336 | timeout = 2*info->timeout; | |
1337 | #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT | |
1338 | printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time); | |
1339 | printk("jiff=%lu...", jiffies); | |
1340 | #endif | |
1341 | while(!((lsr = custom.serdatr) & SDR_TSRE)) { | |
1342 | #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT | |
1343 | printk("serdatr = %d (jiff=%lu)...", lsr, jiffies); | |
1344 | #endif | |
1345 | msleep_interruptible(jiffies_to_msecs(char_time)); | |
1346 | if (signal_pending(current)) | |
1347 | break; | |
1348 | if (timeout && time_after(jiffies, orig_jiffies + timeout)) | |
1349 | break; | |
1350 | } | |
cc0a8fbb | 1351 | __set_current_state(TASK_RUNNING); |
eff4b0b9 | 1352 | |
1da177e4 LT |
1353 | #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT |
1354 | printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies); | |
1355 | #endif | |
1356 | } | |
1357 | ||
1358 | /* | |
1359 | * rs_hangup() --- called by tty_hangup() when a hangup is signaled. | |
1360 | */ | |
1361 | static void rs_hangup(struct tty_struct *tty) | |
1362 | { | |
916b7656 | 1363 | struct serial_state *info = tty->driver_data; |
1da177e4 | 1364 | |
1da177e4 | 1365 | rs_flush_buffer(tty); |
588993dd | 1366 | shutdown(tty, info); |
12c80354 | 1367 | info->tport.count = 0; |
807c8d81 | 1368 | tty_port_set_active(&info->tport, 0); |
87758791 JS |
1369 | info->tport.tty = NULL; |
1370 | wake_up_interruptible(&info->tport.open_wait); | |
1da177e4 LT |
1371 | } |
1372 | ||
1da177e4 LT |
1373 | /* |
1374 | * This routine is called whenever a serial port is opened. It | |
1375 | * enables interrupts for a serial port, linking in its async structure into | |
1376 | * the IRQ chain. It also performs the serial-specific | |
1377 | * initialization for the tty structure. | |
1378 | */ | |
1379 | static int rs_open(struct tty_struct *tty, struct file * filp) | |
1380 | { | |
916b7656 | 1381 | struct serial_state *info = rs_table + tty->index; |
7188dc20 | 1382 | struct tty_port *port = &info->tport; |
410235fd | 1383 | int retval; |
1da177e4 | 1384 | |
7188dc20 JS |
1385 | port->count++; |
1386 | port->tty = tty; | |
916b7656 | 1387 | tty->driver_data = info; |
7188dc20 | 1388 | tty->port = port; |
1da177e4 | 1389 | |
d6c53c0e | 1390 | port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0; |
1da177e4 | 1391 | |
588993dd | 1392 | retval = startup(tty, info); |
1da177e4 LT |
1393 | if (retval) { |
1394 | return retval; | |
1395 | } | |
1396 | ||
6e1aeb03 | 1397 | return tty_port_block_til_ready(port, tty, filp); |
1da177e4 LT |
1398 | } |
1399 | ||
1400 | /* | |
1401 | * /proc fs routines.... | |
1402 | */ | |
1403 | ||
ff169e5c JS |
1404 | static inline void line_info(struct seq_file *m, int line, |
1405 | struct serial_state *state) | |
1da177e4 | 1406 | { |
1da177e4 | 1407 | char stat_buf[30], control, status; |
1da177e4 LT |
1408 | unsigned long flags; |
1409 | ||
ff169e5c | 1410 | seq_printf(m, "%d: uart:amiga_builtin", line); |
1da177e4 | 1411 | |
1da177e4 LT |
1412 | local_irq_save(flags); |
1413 | status = ciab.pra; | |
d41861ca | 1414 | control = tty_port_initialized(&state->tport) ? state->MCR : status; |
1da177e4 LT |
1415 | local_irq_restore(flags); |
1416 | ||
1417 | stat_buf[0] = 0; | |
1418 | stat_buf[1] = 0; | |
1419 | if(!(control & SER_RTS)) | |
1420 | strcat(stat_buf, "|RTS"); | |
1421 | if(!(status & SER_CTS)) | |
1422 | strcat(stat_buf, "|CTS"); | |
1423 | if(!(control & SER_DTR)) | |
1424 | strcat(stat_buf, "|DTR"); | |
1425 | if(!(status & SER_DSR)) | |
1426 | strcat(stat_buf, "|DSR"); | |
1427 | if(!(status & SER_DCD)) | |
1428 | strcat(stat_buf, "|CD"); | |
1429 | ||
916b7656 JS |
1430 | if (state->quot) |
1431 | seq_printf(m, " baud:%d", state->baud_base / state->quot); | |
1da177e4 | 1432 | |
d594027d | 1433 | seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx); |
1da177e4 LT |
1434 | |
1435 | if (state->icount.frame) | |
d594027d | 1436 | seq_printf(m, " fe:%d", state->icount.frame); |
1da177e4 LT |
1437 | |
1438 | if (state->icount.parity) | |
d594027d | 1439 | seq_printf(m, " pe:%d", state->icount.parity); |
1da177e4 LT |
1440 | |
1441 | if (state->icount.brk) | |
d594027d | 1442 | seq_printf(m, " brk:%d", state->icount.brk); |
1da177e4 LT |
1443 | |
1444 | if (state->icount.overrun) | |
d594027d | 1445 | seq_printf(m, " oe:%d", state->icount.overrun); |
1da177e4 LT |
1446 | |
1447 | /* | |
1448 | * Last thing is the RS-232 status lines | |
1449 | */ | |
d594027d | 1450 | seq_printf(m, " %s\n", stat_buf+1); |
1da177e4 LT |
1451 | } |
1452 | ||
d594027d | 1453 | static int rs_proc_show(struct seq_file *m, void *v) |
1da177e4 | 1454 | { |
d594027d | 1455 | seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version); |
ff169e5c | 1456 | line_info(m, 0, &rs_table[0]); |
d594027d | 1457 | return 0; |
1da177e4 LT |
1458 | } |
1459 | ||
1460 | /* | |
1461 | * --------------------------------------------------------------------- | |
1462 | * rs_init() and friends | |
1463 | * | |
1464 | * rs_init() is called at boot-time to initialize the serial driver. | |
1465 | * --------------------------------------------------------------------- | |
1466 | */ | |
1467 | ||
1468 | /* | |
1469 | * This routine prints out the appropriate serial driver version | |
1470 | * number, and identifies which options were configured into this | |
1471 | * driver. | |
1472 | */ | |
41c28ff1 | 1473 | static void show_serial_version(void) |
1da177e4 LT |
1474 | { |
1475 | printk(KERN_INFO "%s version %s\n", serial_name, serial_version); | |
1476 | } | |
1477 | ||
1478 | ||
b68e31d0 | 1479 | static const struct tty_operations serial_ops = { |
1da177e4 LT |
1480 | .open = rs_open, |
1481 | .close = rs_close, | |
1482 | .write = rs_write, | |
1483 | .put_char = rs_put_char, | |
1484 | .flush_chars = rs_flush_chars, | |
1485 | .write_room = rs_write_room, | |
1486 | .chars_in_buffer = rs_chars_in_buffer, | |
1487 | .flush_buffer = rs_flush_buffer, | |
1488 | .ioctl = rs_ioctl, | |
1489 | .throttle = rs_throttle, | |
1490 | .unthrottle = rs_unthrottle, | |
1491 | .set_termios = rs_set_termios, | |
1492 | .stop = rs_stop, | |
1493 | .start = rs_start, | |
1494 | .hangup = rs_hangup, | |
1495 | .break_ctl = rs_break, | |
1496 | .send_xchar = rs_send_xchar, | |
1497 | .wait_until_sent = rs_wait_until_sent, | |
1da177e4 LT |
1498 | .tiocmget = rs_tiocmget, |
1499 | .tiocmset = rs_tiocmset, | |
0587102c | 1500 | .get_icount = rs_get_icount, |
b129cbc9 AV |
1501 | .set_serial = set_serial_info, |
1502 | .get_serial = get_serial_info, | |
8a8dcabf | 1503 | .proc_show = rs_proc_show, |
1da177e4 LT |
1504 | }; |
1505 | ||
f1166604 JS |
1506 | static int amiga_carrier_raised(struct tty_port *port) |
1507 | { | |
1508 | return !(ciab.pra & SER_DCD); | |
1509 | } | |
1510 | ||
1511 | static void amiga_dtr_rts(struct tty_port *port, int raise) | |
1512 | { | |
1513 | struct serial_state *info = container_of(port, struct serial_state, | |
1514 | tport); | |
1515 | unsigned long flags; | |
1516 | ||
1517 | if (raise) | |
1518 | info->MCR |= SER_DTR|SER_RTS; | |
1519 | else | |
1520 | info->MCR &= ~(SER_DTR|SER_RTS); | |
1521 | ||
1522 | local_irq_save(flags); | |
1523 | rtsdtr_ctrl(info->MCR); | |
1524 | local_irq_restore(flags); | |
1525 | } | |
1526 | ||
1527 | static const struct tty_port_operations amiga_port_ops = { | |
1528 | .carrier_raised = amiga_carrier_raised, | |
1529 | .dtr_rts = amiga_dtr_rts, | |
1530 | }; | |
1531 | ||
1da177e4 LT |
1532 | /* |
1533 | * The serial driver boot-time initialization code! | |
1534 | */ | |
826e8c8c | 1535 | static int __init amiga_serial_probe(struct platform_device *pdev) |
1da177e4 LT |
1536 | { |
1537 | unsigned long flags; | |
1538 | struct serial_state * state; | |
5edc304f | 1539 | int error; |
1da177e4 | 1540 | |
410235fd | 1541 | serial_driver = alloc_tty_driver(NR_PORTS); |
1da177e4 LT |
1542 | if (!serial_driver) |
1543 | return -ENOMEM; | |
1544 | ||
1da177e4 LT |
1545 | show_serial_version(); |
1546 | ||
1547 | /* Initialize the tty_driver structure */ | |
1548 | ||
1da177e4 LT |
1549 | serial_driver->driver_name = "amiserial"; |
1550 | serial_driver->name = "ttyS"; | |
1551 | serial_driver->major = TTY_MAJOR; | |
1552 | serial_driver->minor_start = 64; | |
1553 | serial_driver->type = TTY_DRIVER_TYPE_SERIAL; | |
1554 | serial_driver->subtype = SERIAL_TYPE_NORMAL; | |
1555 | serial_driver->init_termios = tty_std_termios; | |
1556 | serial_driver->init_termios.c_cflag = | |
1557 | B9600 | CS8 | CREAD | HUPCL | CLOCAL; | |
1558 | serial_driver->flags = TTY_DRIVER_REAL_RAW; | |
1559 | tty_set_operations(serial_driver, &serial_ops); | |
1560 | ||
1da177e4 | 1561 | state = rs_table; |
1da177e4 | 1562 | state->port = (int)&custom.serdatr; /* Just to give it a value */ |
1da177e4 | 1563 | state->custom_divisor = 0; |
1da177e4 LT |
1564 | state->icount.cts = state->icount.dsr = |
1565 | state->icount.rng = state->icount.dcd = 0; | |
1566 | state->icount.rx = state->icount.tx = 0; | |
1567 | state->icount.frame = state->icount.parity = 0; | |
1568 | state->icount.overrun = state->icount.brk = 0; | |
87758791 | 1569 | tty_port_init(&state->tport); |
f1166604 | 1570 | state->tport.ops = &amiga_port_ops; |
b19e2ca7 JS |
1571 | tty_port_link_device(&state->tport, serial_driver, 0); |
1572 | ||
1573 | error = tty_register_driver(serial_driver); | |
1574 | if (error) | |
1575 | goto fail_put_tty_driver; | |
1da177e4 | 1576 | |
ff169e5c | 1577 | printk(KERN_INFO "ttyS0 is the amiga builtin serial port\n"); |
1da177e4 LT |
1578 | |
1579 | /* Hardware set up */ | |
1580 | ||
1581 | state->baud_base = amiga_colorclock; | |
1582 | state->xmit_fifo_size = 1; | |
1583 | ||
1da177e4 | 1584 | /* set ISRs, and then disable the rx interrupts */ |
5edc304f GU |
1585 | error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state); |
1586 | if (error) | |
1587 | goto fail_unregister; | |
1588 | ||
9cfb5c05 | 1589 | error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0, |
5edc304f GU |
1590 | "serial RX", state); |
1591 | if (error) | |
1592 | goto fail_free_irq; | |
1da177e4 | 1593 | |
c70c036f JL |
1594 | local_irq_save(flags); |
1595 | ||
1da177e4 LT |
1596 | /* turn off Rx and Tx interrupts */ |
1597 | custom.intena = IF_RBF | IF_TBE; | |
1598 | mb(); | |
1599 | ||
1600 | /* clear any pending interrupt */ | |
1601 | custom.intreq = IF_RBF | IF_TBE; | |
1602 | mb(); | |
1603 | ||
1604 | local_irq_restore(flags); | |
1605 | ||
1606 | /* | |
1607 | * set the appropriate directions for the modem control flags, | |
1608 | * and clear RTS and DTR | |
1609 | */ | |
1610 | ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */ | |
1611 | ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */ | |
1612 | ||
826e8c8c GU |
1613 | platform_set_drvdata(pdev, state); |
1614 | ||
1da177e4 | 1615 | return 0; |
5edc304f GU |
1616 | |
1617 | fail_free_irq: | |
1618 | free_irq(IRQ_AMIGA_TBE, state); | |
1619 | fail_unregister: | |
1620 | tty_unregister_driver(serial_driver); | |
5edc304f | 1621 | fail_put_tty_driver: |
191c5f10 | 1622 | tty_port_destroy(&state->tport); |
5edc304f GU |
1623 | put_tty_driver(serial_driver); |
1624 | return error; | |
1da177e4 LT |
1625 | } |
1626 | ||
826e8c8c | 1627 | static int __exit amiga_serial_remove(struct platform_device *pdev) |
1da177e4 LT |
1628 | { |
1629 | int error; | |
826e8c8c | 1630 | struct serial_state *state = platform_get_drvdata(pdev); |
1da177e4 LT |
1631 | |
1632 | /* printk("Unloading %s: version %s\n", serial_name, serial_version); */ | |
2eeaf0bb GKH |
1633 | error = tty_unregister_driver(serial_driver); |
1634 | if (error) | |
1da177e4 LT |
1635 | printk("SERIAL: failed to unregister serial driver (%d)\n", |
1636 | error); | |
1637 | put_tty_driver(serial_driver); | |
191c5f10 | 1638 | tty_port_destroy(&state->tport); |
1da177e4 | 1639 | |
916b7656 JS |
1640 | free_irq(IRQ_AMIGA_TBE, state); |
1641 | free_irq(IRQ_AMIGA_RBF, state); | |
5edc304f | 1642 | |
826e8c8c GU |
1643 | return error; |
1644 | } | |
1645 | ||
1646 | static struct platform_driver amiga_serial_driver = { | |
1647 | .remove = __exit_p(amiga_serial_remove), | |
1648 | .driver = { | |
1649 | .name = "amiga-serial", | |
826e8c8c GU |
1650 | }, |
1651 | }; | |
1652 | ||
fec6bee3 | 1653 | module_platform_driver_probe(amiga_serial_driver, amiga_serial_probe); |
1da177e4 LT |
1654 | |
1655 | ||
d1a35e4d GU |
1656 | #if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE) |
1657 | ||
1da177e4 LT |
1658 | /* |
1659 | * ------------------------------------------------------------ | |
1660 | * Serial console driver | |
1661 | * ------------------------------------------------------------ | |
1662 | */ | |
1da177e4 LT |
1663 | |
1664 | static void amiga_serial_putc(char c) | |
1665 | { | |
1666 | custom.serdat = (unsigned char)c | 0x100; | |
1667 | while (!(custom.serdatr & 0x2000)) | |
1668 | barrier(); | |
1669 | } | |
1670 | ||
1671 | /* | |
1672 | * Print a string to the serial port trying not to disturb | |
1673 | * any possible real use of the port... | |
1674 | * | |
1675 | * The console must be locked when we get here. | |
1676 | */ | |
1677 | static void serial_console_write(struct console *co, const char *s, | |
1678 | unsigned count) | |
1679 | { | |
1680 | unsigned short intena = custom.intenar; | |
1681 | ||
1682 | custom.intena = IF_TBE; | |
1683 | ||
1684 | while (count--) { | |
1685 | if (*s == '\n') | |
1686 | amiga_serial_putc('\r'); | |
1687 | amiga_serial_putc(*s++); | |
1688 | } | |
1689 | ||
1690 | custom.intena = IF_SETCLR | (intena & IF_TBE); | |
1691 | } | |
1692 | ||
1693 | static struct tty_driver *serial_console_device(struct console *c, int *index) | |
1694 | { | |
1695 | *index = 0; | |
1696 | return serial_driver; | |
1697 | } | |
1698 | ||
1699 | static struct console sercons = { | |
1700 | .name = "ttyS", | |
1701 | .write = serial_console_write, | |
1702 | .device = serial_console_device, | |
1703 | .flags = CON_PRINTBUFFER, | |
1704 | .index = -1, | |
1705 | }; | |
1706 | ||
1707 | /* | |
1708 | * Register console. | |
1709 | */ | |
1710 | static int __init amiserial_console_init(void) | |
1711 | { | |
3dcf344b GU |
1712 | if (!MACH_IS_AMIGA) |
1713 | return -ENODEV; | |
1714 | ||
1da177e4 LT |
1715 | register_console(&sercons); |
1716 | return 0; | |
1717 | } | |
1718 | console_initcall(amiserial_console_init); | |
d1a35e4d GU |
1719 | |
1720 | #endif /* CONFIG_SERIAL_CONSOLE && !MODULE */ | |
1da177e4 LT |
1721 | |
1722 | MODULE_LICENSE("GPL"); | |
826e8c8c | 1723 | MODULE_ALIAS("platform:amiga-serial"); |