Commit | Line | Data |
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1da177e4 LT |
1 | /* 68328serial.c: Serial port driver for 68328 microcontroller |
2 | * | |
3 | * Copyright (C) 1995 David S. Miller <davem@caip.rutgers.edu> | |
4 | * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com> | |
5 | * Copyright (C) 1998, 1999 D. Jeff Dionne <jeff@uclinux.org> | |
6 | * Copyright (C) 1999 Vladimir Gurevich <vgurevic@cisco.com> | |
7 | * Copyright (C) 2002-2003 David McCullough <davidm@snapgear.com> | |
8 | * Copyright (C) 2002 Greg Ungerer <gerg@snapgear.com> | |
9 | * | |
10 | * VZ Support/Fixes Evan Stawnyczy <e@lineo.ca> | |
11 | * Multiple UART support Daniel Potts <danielp@cse.unsw.edu.au> | |
12 | * Power management support Daniel Potts <danielp@cse.unsw.edu.au> | |
13 | * VZ Second Serial Port enable Phil Wilshire | |
14 | * 2.4/2.5 port David McCullough | |
15 | */ | |
16 | ||
1da177e4 LT |
17 | #include <linux/module.h> |
18 | #include <linux/errno.h> | |
cea4b2ce | 19 | #include <linux/serial.h> |
1da177e4 LT |
20 | #include <linux/signal.h> |
21 | #include <linux/sched.h> | |
22 | #include <linux/timer.h> | |
23 | #include <linux/interrupt.h> | |
24 | #include <linux/tty.h> | |
25 | #include <linux/tty_flip.h> | |
1da177e4 LT |
26 | #include <linux/major.h> |
27 | #include <linux/string.h> | |
28 | #include <linux/fcntl.h> | |
29 | #include <linux/mm.h> | |
30 | #include <linux/kernel.h> | |
31 | #include <linux/console.h> | |
32 | #include <linux/reboot.h> | |
33 | #include <linux/keyboard.h> | |
34 | #include <linux/init.h> | |
35 | #include <linux/pm.h> | |
36 | #include <linux/bitops.h> | |
37 | #include <linux/delay.h> | |
5a0e3ad6 | 38 | #include <linux/gfp.h> |
1da177e4 LT |
39 | |
40 | #include <asm/io.h> | |
41 | #include <asm/irq.h> | |
1da177e4 LT |
42 | #include <asm/delay.h> |
43 | #include <asm/uaccess.h> | |
44 | ||
45 | /* (es) */ | |
46 | /* note: perhaps we can murge these files, so that you can just | |
47 | * define 1 of them, and they can sort that out for themselves | |
48 | */ | |
49 | #if defined(CONFIG_M68EZ328) | |
50 | #include <asm/MC68EZ328.h> | |
51 | #else | |
52 | #if defined(CONFIG_M68VZ328) | |
53 | #include <asm/MC68VZ328.h> | |
54 | #else | |
55 | #include <asm/MC68328.h> | |
56 | #endif /* CONFIG_M68VZ328 */ | |
57 | #endif /* CONFIG_M68EZ328 */ | |
58 | ||
1da177e4 LT |
59 | /* Turn off usage of real serial interrupt code, to "support" Copilot */ |
60 | #ifdef CONFIG_XCOPILOT_BUGS | |
61 | #undef USE_INTS | |
62 | #else | |
63 | #define USE_INTS | |
64 | #endif | |
65 | ||
1bb2687c JS |
66 | /* |
67 | * I believe this is the optimal setting that reduces the number of interrupts. | |
68 | * At high speeds the output might become a little "bursted" (use USTCNT_TXHE | |
69 | * if that bothers you), but in most cases it will not, since we try to | |
70 | * transmit characters every time rs_interrupt is called. Thus, quite often | |
71 | * you'll see that a receive interrupt occures before the transmit one. | |
72 | * -- Vladimir Gurevich | |
73 | */ | |
74 | #define USTCNT_TX_INTR_MASK (USTCNT_TXEE) | |
75 | ||
76 | /* | |
77 | * 68328 and 68EZ328 UARTS are a little bit different. EZ328 has special | |
78 | * "Old data interrupt" which occures whenever the data stay in the FIFO | |
79 | * longer than 30 bits time. This allows us to use FIFO without compromising | |
80 | * latency. '328 does not have this feature and without the real 328-based | |
81 | * board I would assume that RXRE is the safest setting. | |
82 | * | |
83 | * For EZ328 I use RXHE (Half empty) interrupt to reduce the number of | |
84 | * interrupts. RXFE (receive queue full) causes the system to lose data | |
85 | * at least at 115200 baud | |
86 | * | |
87 | * If your board is busy doing other stuff, you might consider to use | |
88 | * RXRE (data ready intrrupt) instead. | |
89 | * | |
90 | * The other option is to make these INTR masks run-time configurable, so | |
91 | * that people can dynamically adapt them according to the current usage. | |
92 | * -- Vladimir Gurevich | |
93 | */ | |
94 | ||
95 | /* (es) */ | |
96 | #if defined(CONFIG_M68EZ328) || defined(CONFIG_M68VZ328) | |
97 | #define USTCNT_RX_INTR_MASK (USTCNT_RXHE | USTCNT_ODEN) | |
98 | #elif defined(CONFIG_M68328) | |
99 | #define USTCNT_RX_INTR_MASK (USTCNT_RXRE) | |
100 | #else | |
101 | #error Please, define the Rx interrupt events for your CPU | |
102 | #endif | |
103 | /* (/es) */ | |
104 | ||
105 | /* | |
106 | * This is our internal structure for each serial port's state. | |
1bb2687c JS |
107 | */ |
108 | struct m68k_serial { | |
86264341 | 109 | struct tty_port tport; |
1bb2687c JS |
110 | char is_cons; /* Is this our console. */ |
111 | int magic; | |
112 | int baud_base; | |
113 | int port; | |
114 | int irq; | |
1bb2687c | 115 | int type; /* UART type */ |
1bb2687c JS |
116 | int custom_divisor; |
117 | int x_char; /* xon/xoff character */ | |
1bb2687c | 118 | int line; |
1bb2687c JS |
119 | unsigned char *xmit_buf; |
120 | int xmit_head; | |
121 | int xmit_tail; | |
122 | int xmit_cnt; | |
1bb2687c JS |
123 | }; |
124 | ||
125 | #define SERIAL_MAGIC 0x5301 | |
126 | ||
127 | /* | |
128 | * Define the number of ports supported and their irqs. | |
129 | */ | |
130 | #define NR_PORTS 1 | |
131 | ||
1da177e4 | 132 | static struct m68k_serial m68k_soft[NR_PORTS]; |
1da177e4 | 133 | |
1bb2687c | 134 | static unsigned int uart_irqs[NR_PORTS] = { UART_IRQ_NUM }; |
1da177e4 LT |
135 | |
136 | /* multiple ports are contiguous in memory */ | |
137 | m68328_uart *uart_addr = (m68328_uart *)USTCNT_ADDR; | |
138 | ||
1da177e4 LT |
139 | struct tty_driver *serial_driver; |
140 | ||
467712c9 | 141 | static void change_speed(struct m68k_serial *info, struct tty_struct *tty); |
1da177e4 LT |
142 | |
143 | /* | |
144 | * Setup for console. Argument comes from the boot command line. | |
145 | */ | |
146 | ||
f5e92c3f CE |
147 | /* note: this is messy, but it works, again, perhaps defined somewhere else?*/ |
148 | #ifdef CONFIG_M68VZ328 | |
149 | #define CONSOLE_BAUD_RATE 19200 | |
150 | #define DEFAULT_CBAUD B19200 | |
1da177e4 LT |
151 | #endif |
152 | ||
f5e92c3f | 153 | |
1da177e4 LT |
154 | #ifndef CONSOLE_BAUD_RATE |
155 | #define CONSOLE_BAUD_RATE 9600 | |
156 | #define DEFAULT_CBAUD B9600 | |
157 | #endif | |
158 | ||
159 | ||
160 | static int m68328_console_initted = 0; | |
161 | static int m68328_console_baud = CONSOLE_BAUD_RATE; | |
162 | static int m68328_console_cbaud = DEFAULT_CBAUD; | |
163 | ||
164 | ||
1da177e4 LT |
165 | static inline int serial_paranoia_check(struct m68k_serial *info, |
166 | char *name, const char *routine) | |
167 | { | |
168 | #ifdef SERIAL_PARANOIA_CHECK | |
169 | static const char *badmagic = | |
170 | "Warning: bad magic number for serial struct %s in %s\n"; | |
171 | static const char *badinfo = | |
172 | "Warning: null m68k_serial for %s in %s\n"; | |
173 | ||
174 | if (!info) { | |
175 | printk(badinfo, name, routine); | |
176 | return 1; | |
177 | } | |
178 | if (info->magic != SERIAL_MAGIC) { | |
179 | printk(badmagic, name, routine); | |
180 | return 1; | |
181 | } | |
182 | #endif | |
183 | return 0; | |
184 | } | |
185 | ||
186 | /* | |
187 | * This is used to figure out the divisor speeds and the timeouts | |
188 | */ | |
189 | static int baud_table[] = { | |
190 | 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800, | |
191 | 9600, 19200, 38400, 57600, 115200, 0 }; | |
192 | ||
1da177e4 LT |
193 | /* Utility routines */ |
194 | static inline int get_baud(struct m68k_serial *ss) | |
195 | { | |
196 | unsigned long result = 115200; | |
197 | unsigned short int baud = uart_addr[ss->line].ubaud; | |
198 | if (GET_FIELD(baud, UBAUD_PRESCALER) == 0x38) result = 38400; | |
199 | result >>= GET_FIELD(baud, UBAUD_DIVIDE); | |
200 | ||
201 | return result; | |
202 | } | |
203 | ||
204 | /* | |
205 | * ------------------------------------------------------------ | |
206 | * rs_stop() and rs_start() | |
207 | * | |
208 | * This routines are called before setting or resetting tty->stopped. | |
209 | * They enable or disable transmitter interrupts, as necessary. | |
210 | * ------------------------------------------------------------ | |
211 | */ | |
212 | static void rs_stop(struct tty_struct *tty) | |
213 | { | |
214 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
215 | m68328_uart *uart = &uart_addr[info->line]; | |
216 | unsigned long flags; | |
217 | ||
218 | if (serial_paranoia_check(info, tty->name, "rs_stop")) | |
219 | return; | |
220 | ||
727dda80 | 221 | local_irq_save(flags); |
1da177e4 | 222 | uart->ustcnt &= ~USTCNT_TXEN; |
727dda80 | 223 | local_irq_restore(flags); |
1da177e4 LT |
224 | } |
225 | ||
09a6ffa8 | 226 | static int rs_put_char(char ch) |
1da177e4 | 227 | { |
107afb7a JS |
228 | unsigned long flags; |
229 | int loops = 0; | |
1da177e4 | 230 | |
727dda80 | 231 | local_irq_save(flags); |
1da177e4 LT |
232 | |
233 | while (!(UTX & UTX_TX_AVAIL) && (loops < 1000)) { | |
234 | loops++; | |
235 | udelay(5); | |
236 | } | |
237 | ||
238 | UTX_TXDATA = ch; | |
239 | udelay(5); | |
727dda80 | 240 | local_irq_restore(flags); |
09a6ffa8 | 241 | return 1; |
1da177e4 LT |
242 | } |
243 | ||
244 | static void rs_start(struct tty_struct *tty) | |
245 | { | |
246 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
247 | m68328_uart *uart = &uart_addr[info->line]; | |
248 | unsigned long flags; | |
249 | ||
250 | if (serial_paranoia_check(info, tty->name, "rs_start")) | |
251 | return; | |
252 | ||
727dda80 | 253 | local_irq_save(flags); |
1da177e4 LT |
254 | if (info->xmit_cnt && info->xmit_buf && !(uart->ustcnt & USTCNT_TXEN)) { |
255 | #ifdef USE_INTS | |
256 | uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK; | |
257 | #else | |
258 | uart->ustcnt |= USTCNT_TXEN; | |
259 | #endif | |
260 | } | |
727dda80 | 261 | local_irq_restore(flags); |
1da177e4 LT |
262 | } |
263 | ||
6732c8bb | 264 | static void receive_chars(struct m68k_serial *info, unsigned short rx) |
1da177e4 | 265 | { |
1da177e4 | 266 | m68328_uart *uart = &uart_addr[info->line]; |
33f0f88f | 267 | unsigned char ch, flag; |
1da177e4 LT |
268 | |
269 | /* | |
270 | * This do { } while() loop will get ALL chars out of Rx FIFO | |
271 | */ | |
272 | #ifndef CONFIG_XCOPILOT_BUGS | |
273 | do { | |
274 | #endif | |
275 | ch = GET_FIELD(rx, URX_RXDATA); | |
276 | ||
277 | if(info->is_cons) { | |
278 | if(URX_BREAK & rx) { /* whee, break received */ | |
1da177e4 LT |
279 | return; |
280 | #ifdef CONFIG_MAGIC_SYSRQ | |
281 | } else if (ch == 0x10) { /* ^P */ | |
282 | show_state(); | |
7bf02ea2 | 283 | show_free_areas(0); |
1da177e4 LT |
284 | show_buffers(); |
285 | /* show_net_buffers(); */ | |
286 | return; | |
287 | } else if (ch == 0x12) { /* ^R */ | |
804ebf46 | 288 | emergency_restart(); |
1da177e4 LT |
289 | return; |
290 | #endif /* CONFIG_MAGIC_SYSRQ */ | |
291 | } | |
1da177e4 LT |
292 | } |
293 | ||
33f0f88f AC |
294 | flag = TTY_NORMAL; |
295 | ||
c21e2654 | 296 | if (rx & URX_PARITY_ERROR) |
33f0f88f | 297 | flag = TTY_PARITY; |
c21e2654 | 298 | else if (rx & URX_OVRUN) |
33f0f88f | 299 | flag = TTY_OVERRUN; |
c21e2654 | 300 | else if (rx & URX_FRAME_ERROR) |
33f0f88f | 301 | flag = TTY_FRAME; |
c21e2654 | 302 | |
92a19f9c | 303 | tty_insert_flip_char(&info->tport, ch, flag); |
1da177e4 LT |
304 | #ifndef CONFIG_XCOPILOT_BUGS |
305 | } while((rx = uart->urx.w) & URX_DATA_READY); | |
306 | #endif | |
307 | ||
6732c8bb | 308 | tty_schedule_flip(&info->tport); |
1da177e4 LT |
309 | } |
310 | ||
467712c9 | 311 | static void transmit_chars(struct m68k_serial *info, struct tty_struct *tty) |
1da177e4 LT |
312 | { |
313 | m68328_uart *uart = &uart_addr[info->line]; | |
314 | ||
315 | if (info->x_char) { | |
316 | /* Send next char */ | |
317 | uart->utx.b.txdata = info->x_char; | |
318 | info->x_char = 0; | |
319 | goto clear_and_return; | |
320 | } | |
321 | ||
467712c9 | 322 | if ((info->xmit_cnt <= 0) || !tty || tty->stopped) { |
1da177e4 LT |
323 | /* That's peculiar... TX ints off */ |
324 | uart->ustcnt &= ~USTCNT_TX_INTR_MASK; | |
325 | goto clear_and_return; | |
326 | } | |
327 | ||
328 | /* Send char */ | |
329 | uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++]; | |
330 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); | |
331 | info->xmit_cnt--; | |
332 | ||
1da177e4 LT |
333 | if(info->xmit_cnt <= 0) { |
334 | /* All done for now... TX ints off */ | |
335 | uart->ustcnt &= ~USTCNT_TX_INTR_MASK; | |
336 | goto clear_and_return; | |
337 | } | |
338 | ||
339 | clear_and_return: | |
340 | /* Clear interrupt (should be auto)*/ | |
341 | return; | |
342 | } | |
343 | ||
344 | /* | |
345 | * This is the serial driver's generic interrupt routine | |
346 | */ | |
7d12e780 | 347 | irqreturn_t rs_interrupt(int irq, void *dev_id) |
1da177e4 | 348 | { |
25db8ad5 | 349 | struct m68k_serial *info = dev_id; |
665569d0 | 350 | struct tty_struct *tty = tty_port_tty_get(&info->tport); |
1da177e4 LT |
351 | m68328_uart *uart; |
352 | unsigned short rx; | |
353 | unsigned short tx; | |
354 | ||
1da177e4 LT |
355 | uart = &uart_addr[info->line]; |
356 | rx = uart->urx.w; | |
357 | ||
358 | #ifdef USE_INTS | |
359 | tx = uart->utx.w; | |
360 | ||
467712c9 | 361 | if (rx & URX_DATA_READY) |
6732c8bb | 362 | receive_chars(info, rx); |
467712c9 JS |
363 | if (tx & UTX_TX_AVAIL) |
364 | transmit_chars(info, tty); | |
1da177e4 | 365 | #else |
6732c8bb | 366 | receive_chars(info, rx); |
1da177e4 | 367 | #endif |
665569d0 JS |
368 | tty_kref_put(tty); |
369 | ||
1da177e4 LT |
370 | return IRQ_HANDLED; |
371 | } | |
372 | ||
467712c9 | 373 | static int startup(struct m68k_serial *info, struct tty_struct *tty) |
1da177e4 LT |
374 | { |
375 | m68328_uart *uart = &uart_addr[info->line]; | |
376 | unsigned long flags; | |
377 | ||
a85dd82c | 378 | if (info->tport.flags & ASYNC_INITIALIZED) |
1da177e4 LT |
379 | return 0; |
380 | ||
381 | if (!info->xmit_buf) { | |
382 | info->xmit_buf = (unsigned char *) __get_free_page(GFP_KERNEL); | |
383 | if (!info->xmit_buf) | |
384 | return -ENOMEM; | |
385 | } | |
386 | ||
727dda80 | 387 | local_irq_save(flags); |
1da177e4 LT |
388 | |
389 | /* | |
390 | * Clear the FIFO buffers and disable them | |
391 | * (they will be reenabled in change_speed()) | |
392 | */ | |
393 | ||
394 | uart->ustcnt = USTCNT_UEN; | |
1da177e4 LT |
395 | uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_TXEN; |
396 | (void)uart->urx.w; | |
397 | ||
398 | /* | |
399 | * Finally, enable sequencing and interrupts | |
400 | */ | |
401 | #ifdef USE_INTS | |
402 | uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | | |
403 | USTCNT_RX_INTR_MASK | USTCNT_TX_INTR_MASK; | |
404 | #else | |
405 | uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_RX_INTR_MASK; | |
406 | #endif | |
407 | ||
467712c9 JS |
408 | if (tty) |
409 | clear_bit(TTY_IO_ERROR, &tty->flags); | |
1da177e4 LT |
410 | info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; |
411 | ||
412 | /* | |
413 | * and set the speed of the serial port | |
414 | */ | |
415 | ||
467712c9 | 416 | change_speed(info, tty); |
1da177e4 | 417 | |
a85dd82c | 418 | info->tport.flags |= ASYNC_INITIALIZED; |
727dda80 | 419 | local_irq_restore(flags); |
1da177e4 LT |
420 | return 0; |
421 | } | |
422 | ||
423 | /* | |
424 | * This routine will shutdown a serial port; interrupts are disabled, and | |
425 | * DTR is dropped if the hangup on close termio flag is on. | |
426 | */ | |
467712c9 | 427 | static void shutdown(struct m68k_serial *info, struct tty_struct *tty) |
1da177e4 LT |
428 | { |
429 | m68328_uart *uart = &uart_addr[info->line]; | |
430 | unsigned long flags; | |
431 | ||
432 | uart->ustcnt = 0; /* All off! */ | |
a85dd82c | 433 | if (!(info->tport.flags & ASYNC_INITIALIZED)) |
1da177e4 LT |
434 | return; |
435 | ||
727dda80 | 436 | local_irq_save(flags); |
1da177e4 LT |
437 | |
438 | if (info->xmit_buf) { | |
439 | free_page((unsigned long) info->xmit_buf); | |
440 | info->xmit_buf = 0; | |
441 | } | |
442 | ||
467712c9 JS |
443 | if (tty) |
444 | set_bit(TTY_IO_ERROR, &tty->flags); | |
1da177e4 | 445 | |
a85dd82c | 446 | info->tport.flags &= ~ASYNC_INITIALIZED; |
727dda80 | 447 | local_irq_restore(flags); |
1da177e4 LT |
448 | } |
449 | ||
450 | struct { | |
451 | int divisor, prescale; | |
452 | } | |
453 | #ifndef CONFIG_M68VZ328 | |
454 | hw_baud_table[18] = { | |
455 | {0,0}, /* 0 */ | |
456 | {0,0}, /* 50 */ | |
457 | {0,0}, /* 75 */ | |
458 | {0,0}, /* 110 */ | |
459 | {0,0}, /* 134 */ | |
460 | {0,0}, /* 150 */ | |
461 | {0,0}, /* 200 */ | |
462 | {7,0x26}, /* 300 */ | |
463 | {6,0x26}, /* 600 */ | |
464 | {5,0x26}, /* 1200 */ | |
465 | {0,0}, /* 1800 */ | |
466 | {4,0x26}, /* 2400 */ | |
467 | {3,0x26}, /* 4800 */ | |
468 | {2,0x26}, /* 9600 */ | |
469 | {1,0x26}, /* 19200 */ | |
470 | {0,0x26}, /* 38400 */ | |
471 | {1,0x38}, /* 57600 */ | |
472 | {0,0x38}, /* 115200 */ | |
473 | }; | |
474 | #else | |
475 | hw_baud_table[18] = { | |
476 | {0,0}, /* 0 */ | |
477 | {0,0}, /* 50 */ | |
478 | {0,0}, /* 75 */ | |
479 | {0,0}, /* 110 */ | |
480 | {0,0}, /* 134 */ | |
481 | {0,0}, /* 150 */ | |
482 | {0,0}, /* 200 */ | |
483 | {0,0}, /* 300 */ | |
484 | {7,0x26}, /* 600 */ | |
485 | {6,0x26}, /* 1200 */ | |
486 | {0,0}, /* 1800 */ | |
487 | {5,0x26}, /* 2400 */ | |
488 | {4,0x26}, /* 4800 */ | |
489 | {3,0x26}, /* 9600 */ | |
490 | {2,0x26}, /* 19200 */ | |
491 | {1,0x26}, /* 38400 */ | |
492 | {0,0x26}, /* 57600 */ | |
493 | {1,0x38}, /* 115200 */ | |
494 | }; | |
495 | #endif | |
496 | /* rate = 1036800 / ((65 - prescale) * (1<<divider)) */ | |
497 | ||
498 | /* | |
499 | * This routine is called to set the UART divisor registers to match | |
500 | * the specified baud rate for a serial port. | |
501 | */ | |
467712c9 | 502 | static void change_speed(struct m68k_serial *info, struct tty_struct *tty) |
1da177e4 LT |
503 | { |
504 | m68328_uart *uart = &uart_addr[info->line]; | |
505 | unsigned short port; | |
506 | unsigned short ustcnt; | |
507 | unsigned cflag; | |
508 | int i; | |
509 | ||
3dd332c5 | 510 | cflag = tty->termios.c_cflag; |
1da177e4 LT |
511 | if (!(port = info->port)) |
512 | return; | |
513 | ||
514 | ustcnt = uart->ustcnt; | |
515 | uart->ustcnt = ustcnt & ~USTCNT_TXEN; | |
516 | ||
517 | i = cflag & CBAUD; | |
518 | if (i & CBAUDEX) { | |
519 | i = (i & ~CBAUDEX) + B38400; | |
520 | } | |
521 | ||
1da177e4 LT |
522 | uart->ubaud = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) | |
523 | PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale); | |
524 | ||
525 | ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7); | |
526 | ||
527 | if ((cflag & CSIZE) == CS8) | |
528 | ustcnt |= USTCNT_8_7; | |
529 | ||
530 | if (cflag & CSTOPB) | |
531 | ustcnt |= USTCNT_STOP; | |
532 | ||
533 | if (cflag & PARENB) | |
534 | ustcnt |= USTCNT_PARITYEN; | |
535 | if (cflag & PARODD) | |
536 | ustcnt |= USTCNT_ODD_EVEN; | |
537 | ||
538 | #ifdef CONFIG_SERIAL_68328_RTS_CTS | |
539 | if (cflag & CRTSCTS) { | |
540 | uart->utx.w &= ~ UTX_NOCTS; | |
541 | } else { | |
542 | uart->utx.w |= UTX_NOCTS; | |
543 | } | |
544 | #endif | |
545 | ||
546 | ustcnt |= USTCNT_TXEN; | |
547 | ||
548 | uart->ustcnt = ustcnt; | |
549 | return; | |
550 | } | |
551 | ||
552 | /* | |
553 | * Fair output driver allows a process to speak. | |
554 | */ | |
555 | static void rs_fair_output(void) | |
556 | { | |
557 | int left; /* Output no more than that */ | |
558 | unsigned long flags; | |
559 | struct m68k_serial *info = &m68k_soft[0]; | |
560 | char c; | |
561 | ||
562 | if (info == 0) return; | |
563 | if (info->xmit_buf == 0) return; | |
564 | ||
727dda80 | 565 | local_irq_save(flags); |
1da177e4 LT |
566 | left = info->xmit_cnt; |
567 | while (left != 0) { | |
568 | c = info->xmit_buf[info->xmit_tail]; | |
569 | info->xmit_tail = (info->xmit_tail+1) & (SERIAL_XMIT_SIZE-1); | |
570 | info->xmit_cnt--; | |
727dda80 | 571 | local_irq_restore(flags); |
1da177e4 LT |
572 | |
573 | rs_put_char(c); | |
574 | ||
727dda80 | 575 | local_irq_save(flags); |
1da177e4 LT |
576 | left = min(info->xmit_cnt, left-1); |
577 | } | |
578 | ||
579 | /* Last character is being transmitted now (hopefully). */ | |
580 | udelay(5); | |
581 | ||
727dda80 | 582 | local_irq_restore(flags); |
1da177e4 LT |
583 | return; |
584 | } | |
585 | ||
586 | /* | |
587 | * m68k_console_print is registered for printk. | |
588 | */ | |
589 | void console_print_68328(const char *p) | |
590 | { | |
591 | char c; | |
592 | ||
593 | while((c=*(p++)) != 0) { | |
594 | if(c == '\n') | |
595 | rs_put_char('\r'); | |
596 | rs_put_char(c); | |
597 | } | |
598 | ||
599 | /* Comment this if you want to have a strict interrupt-driven output */ | |
600 | rs_fair_output(); | |
601 | ||
602 | return; | |
603 | } | |
604 | ||
605 | static void rs_set_ldisc(struct tty_struct *tty) | |
606 | { | |
607 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
608 | ||
609 | if (serial_paranoia_check(info, tty->name, "rs_set_ldisc")) | |
610 | return; | |
611 | ||
3dd332c5 | 612 | info->is_cons = (tty->termios.c_line == N_TTY); |
1da177e4 LT |
613 | |
614 | printk("ttyS%d console mode %s\n", info->line, info->is_cons ? "on" : "off"); | |
615 | } | |
616 | ||
617 | static void rs_flush_chars(struct tty_struct *tty) | |
618 | { | |
619 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
620 | m68328_uart *uart = &uart_addr[info->line]; | |
621 | unsigned long flags; | |
622 | ||
623 | if (serial_paranoia_check(info, tty->name, "rs_flush_chars")) | |
624 | return; | |
625 | #ifndef USE_INTS | |
626 | for(;;) { | |
627 | #endif | |
628 | ||
629 | /* Enable transmitter */ | |
727dda80 | 630 | local_irq_save(flags); |
1da177e4 | 631 | |
ee797069 | 632 | if (info->xmit_cnt <= 0 || tty->stopped || !info->xmit_buf) { |
727dda80 | 633 | local_irq_restore(flags); |
1da177e4 LT |
634 | return; |
635 | } | |
636 | ||
637 | #ifdef USE_INTS | |
638 | uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK; | |
639 | #else | |
640 | uart->ustcnt |= USTCNT_TXEN; | |
641 | #endif | |
642 | ||
643 | #ifdef USE_INTS | |
644 | if (uart->utx.w & UTX_TX_AVAIL) { | |
645 | #else | |
646 | if (1) { | |
647 | #endif | |
648 | /* Send char */ | |
649 | uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++]; | |
650 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); | |
651 | info->xmit_cnt--; | |
652 | } | |
653 | ||
654 | #ifndef USE_INTS | |
655 | while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5); | |
656 | } | |
657 | #endif | |
727dda80 | 658 | local_irq_restore(flags); |
1da177e4 LT |
659 | } |
660 | ||
661 | extern void console_printn(const char * b, int count); | |
662 | ||
663 | static int rs_write(struct tty_struct * tty, | |
664 | const unsigned char *buf, int count) | |
665 | { | |
666 | int c, total = 0; | |
667 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
668 | m68328_uart *uart = &uart_addr[info->line]; | |
669 | unsigned long flags; | |
670 | ||
671 | if (serial_paranoia_check(info, tty->name, "rs_write")) | |
672 | return 0; | |
673 | ||
674 | if (!tty || !info->xmit_buf) | |
675 | return 0; | |
676 | ||
727dda80 | 677 | local_save_flags(flags); |
1da177e4 | 678 | while (1) { |
727dda80 | 679 | local_irq_disable(); |
1da177e4 LT |
680 | c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1, |
681 | SERIAL_XMIT_SIZE - info->xmit_head)); | |
727dda80 GU |
682 | local_irq_restore(flags); |
683 | ||
1da177e4 LT |
684 | if (c <= 0) |
685 | break; | |
686 | ||
687 | memcpy(info->xmit_buf + info->xmit_head, buf, c); | |
727dda80 GU |
688 | |
689 | local_irq_disable(); | |
1da177e4 LT |
690 | info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1); |
691 | info->xmit_cnt += c; | |
727dda80 | 692 | local_irq_restore(flags); |
1da177e4 LT |
693 | buf += c; |
694 | count -= c; | |
695 | total += c; | |
696 | } | |
697 | ||
ee797069 | 698 | if (info->xmit_cnt && !tty->stopped) { |
1da177e4 | 699 | /* Enable transmitter */ |
727dda80 | 700 | local_irq_disable(); |
1da177e4 LT |
701 | #ifndef USE_INTS |
702 | while(info->xmit_cnt) { | |
703 | #endif | |
704 | ||
705 | uart->ustcnt |= USTCNT_TXEN; | |
706 | #ifdef USE_INTS | |
707 | uart->ustcnt |= USTCNT_TX_INTR_MASK; | |
708 | #else | |
709 | while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5); | |
710 | #endif | |
711 | if (uart->utx.w & UTX_TX_AVAIL) { | |
712 | uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++]; | |
713 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); | |
714 | info->xmit_cnt--; | |
715 | } | |
716 | ||
717 | #ifndef USE_INTS | |
718 | } | |
719 | #endif | |
727dda80 | 720 | local_irq_restore(flags); |
1da177e4 | 721 | } |
727dda80 | 722 | |
1da177e4 LT |
723 | return total; |
724 | } | |
725 | ||
726 | static int rs_write_room(struct tty_struct *tty) | |
727 | { | |
728 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
729 | int ret; | |
730 | ||
731 | if (serial_paranoia_check(info, tty->name, "rs_write_room")) | |
732 | return 0; | |
733 | ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1; | |
734 | if (ret < 0) | |
735 | ret = 0; | |
736 | return ret; | |
737 | } | |
738 | ||
739 | static int rs_chars_in_buffer(struct tty_struct *tty) | |
740 | { | |
741 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
742 | ||
743 | if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer")) | |
744 | return 0; | |
745 | return info->xmit_cnt; | |
746 | } | |
747 | ||
748 | static void rs_flush_buffer(struct tty_struct *tty) | |
749 | { | |
750 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
727dda80 | 751 | unsigned long flags; |
1da177e4 LT |
752 | |
753 | if (serial_paranoia_check(info, tty->name, "rs_flush_buffer")) | |
754 | return; | |
727dda80 | 755 | local_irq_save(flags); |
1da177e4 | 756 | info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; |
727dda80 | 757 | local_irq_restore(flags); |
1da177e4 LT |
758 | tty_wakeup(tty); |
759 | } | |
760 | ||
761 | /* | |
762 | * ------------------------------------------------------------ | |
763 | * rs_throttle() | |
764 | * | |
765 | * This routine is called by the upper-layer tty layer to signal that | |
766 | * incoming characters should be throttled. | |
767 | * ------------------------------------------------------------ | |
768 | */ | |
769 | static void rs_throttle(struct tty_struct * tty) | |
770 | { | |
771 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
772 | ||
773 | if (serial_paranoia_check(info, tty->name, "rs_throttle")) | |
774 | return; | |
775 | ||
776 | if (I_IXOFF(tty)) | |
777 | info->x_char = STOP_CHAR(tty); | |
778 | ||
779 | /* Turn off RTS line (do this atomic) */ | |
780 | } | |
781 | ||
782 | static void rs_unthrottle(struct tty_struct * tty) | |
783 | { | |
784 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
785 | ||
786 | if (serial_paranoia_check(info, tty->name, "rs_unthrottle")) | |
787 | return; | |
788 | ||
789 | if (I_IXOFF(tty)) { | |
790 | if (info->x_char) | |
791 | info->x_char = 0; | |
792 | else | |
793 | info->x_char = START_CHAR(tty); | |
794 | } | |
795 | ||
796 | /* Assert RTS line (do this atomic) */ | |
797 | } | |
798 | ||
799 | /* | |
800 | * ------------------------------------------------------------ | |
801 | * rs_ioctl() and friends | |
802 | * ------------------------------------------------------------ | |
803 | */ | |
804 | ||
805 | static int get_serial_info(struct m68k_serial * info, | |
806 | struct serial_struct * retinfo) | |
807 | { | |
808 | struct serial_struct tmp; | |
809 | ||
810 | if (!retinfo) | |
811 | return -EFAULT; | |
812 | memset(&tmp, 0, sizeof(tmp)); | |
813 | tmp.type = info->type; | |
814 | tmp.line = info->line; | |
815 | tmp.port = info->port; | |
816 | tmp.irq = info->irq; | |
a85dd82c | 817 | tmp.flags = info->tport.flags; |
1da177e4 | 818 | tmp.baud_base = info->baud_base; |
4a85b1fc JS |
819 | tmp.close_delay = info->tport.close_delay; |
820 | tmp.closing_wait = info->tport.closing_wait; | |
1da177e4 | 821 | tmp.custom_divisor = info->custom_divisor; |
5d56356a KV |
822 | if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) |
823 | return -EFAULT; | |
824 | ||
1da177e4 LT |
825 | return 0; |
826 | } | |
827 | ||
467712c9 | 828 | static int set_serial_info(struct m68k_serial *info, struct tty_struct *tty, |
1da177e4 LT |
829 | struct serial_struct * new_info) |
830 | { | |
4a85b1fc | 831 | struct tty_port *port = &info->tport; |
1da177e4 LT |
832 | struct serial_struct new_serial; |
833 | struct m68k_serial old_info; | |
834 | int retval = 0; | |
835 | ||
836 | if (!new_info) | |
837 | return -EFAULT; | |
5d56356a KV |
838 | if (copy_from_user(&new_serial, new_info, sizeof(new_serial))) |
839 | return -EFAULT; | |
1da177e4 LT |
840 | old_info = *info; |
841 | ||
842 | if (!capable(CAP_SYS_ADMIN)) { | |
843 | if ((new_serial.baud_base != info->baud_base) || | |
844 | (new_serial.type != info->type) || | |
4a85b1fc | 845 | (new_serial.close_delay != port->close_delay) || |
cea4b2ce | 846 | ((new_serial.flags & ~ASYNC_USR_MASK) != |
a85dd82c | 847 | (port->flags & ~ASYNC_USR_MASK))) |
1da177e4 | 848 | return -EPERM; |
a85dd82c | 849 | port->flags = ((port->flags & ~ASYNC_USR_MASK) | |
cea4b2ce | 850 | (new_serial.flags & ASYNC_USR_MASK)); |
1da177e4 LT |
851 | info->custom_divisor = new_serial.custom_divisor; |
852 | goto check_and_exit; | |
853 | } | |
854 | ||
4a85b1fc | 855 | if (port->count > 1) |
1da177e4 LT |
856 | return -EBUSY; |
857 | ||
858 | /* | |
859 | * OK, past this point, all the error checking has been done. | |
860 | * At this point, we start making changes..... | |
861 | */ | |
862 | ||
863 | info->baud_base = new_serial.baud_base; | |
a85dd82c | 864 | port->flags = ((port->flags & ~ASYNC_FLAGS) | |
cea4b2ce | 865 | (new_serial.flags & ASYNC_FLAGS)); |
1da177e4 | 866 | info->type = new_serial.type; |
4a85b1fc JS |
867 | port->close_delay = new_serial.close_delay; |
868 | port->closing_wait = new_serial.closing_wait; | |
1da177e4 LT |
869 | |
870 | check_and_exit: | |
467712c9 | 871 | retval = startup(info, tty); |
1da177e4 LT |
872 | return retval; |
873 | } | |
874 | ||
875 | /* | |
876 | * get_lsr_info - get line status register info | |
877 | * | |
878 | * Purpose: Let user call ioctl() to get info when the UART physically | |
879 | * is emptied. On bus types like RS485, the transmitter must | |
880 | * release the bus after transmitting. This must be done when | |
881 | * the transmit shift register is empty, not be done when the | |
882 | * transmit holding register is empty. This functionality | |
883 | * allows an RS485 driver to be written in user space. | |
884 | */ | |
885 | static int get_lsr_info(struct m68k_serial * info, unsigned int *value) | |
886 | { | |
887 | #ifdef CONFIG_SERIAL_68328_RTS_CTS | |
888 | m68328_uart *uart = &uart_addr[info->line]; | |
889 | #endif | |
890 | unsigned char status; | |
727dda80 | 891 | unsigned long flags; |
1da177e4 | 892 | |
727dda80 | 893 | local_irq_save(flags); |
1da177e4 LT |
894 | #ifdef CONFIG_SERIAL_68328_RTS_CTS |
895 | status = (uart->utx.w & UTX_CTS_STAT) ? 1 : 0; | |
896 | #else | |
897 | status = 0; | |
898 | #endif | |
727dda80 | 899 | local_irq_restore(flags); |
5d56356a | 900 | return put_user(status, value); |
1da177e4 LT |
901 | } |
902 | ||
903 | /* | |
904 | * This routine sends a break character out the serial port. | |
905 | */ | |
6a72c7ba | 906 | static void send_break(struct m68k_serial * info, unsigned int duration) |
1da177e4 LT |
907 | { |
908 | m68328_uart *uart = &uart_addr[info->line]; | |
909 | unsigned long flags; | |
910 | if (!info->port) | |
911 | return; | |
727dda80 | 912 | local_irq_save(flags); |
1da177e4 LT |
913 | #ifdef USE_INTS |
914 | uart->utx.w |= UTX_SEND_BREAK; | |
6a72c7ba | 915 | msleep_interruptible(duration); |
1da177e4 LT |
916 | uart->utx.w &= ~UTX_SEND_BREAK; |
917 | #endif | |
727dda80 | 918 | local_irq_restore(flags); |
1da177e4 LT |
919 | } |
920 | ||
6caa76b7 | 921 | static int rs_ioctl(struct tty_struct *tty, |
1da177e4 LT |
922 | unsigned int cmd, unsigned long arg) |
923 | { | |
1da177e4 LT |
924 | struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; |
925 | int retval; | |
926 | ||
927 | if (serial_paranoia_check(info, tty->name, "rs_ioctl")) | |
928 | return -ENODEV; | |
929 | ||
930 | if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && | |
931 | (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) && | |
932 | (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) { | |
933 | if (tty->flags & (1 << TTY_IO_ERROR)) | |
934 | return -EIO; | |
935 | } | |
936 | ||
937 | switch (cmd) { | |
938 | case TCSBRK: /* SVID version: non-zero arg --> no break */ | |
939 | retval = tty_check_change(tty); | |
940 | if (retval) | |
941 | return retval; | |
942 | tty_wait_until_sent(tty, 0); | |
943 | if (!arg) | |
6a72c7ba | 944 | send_break(info, 250); /* 1/4 second */ |
1da177e4 LT |
945 | return 0; |
946 | case TCSBRKP: /* support for POSIX tcsendbreak() */ | |
947 | retval = tty_check_change(tty); | |
948 | if (retval) | |
949 | return retval; | |
950 | tty_wait_until_sent(tty, 0); | |
6a72c7ba | 951 | send_break(info, arg ? arg*(100) : 250); |
1da177e4 | 952 | return 0; |
1da177e4 | 953 | case TIOCGSERIAL: |
5d56356a KV |
954 | return get_serial_info(info, |
955 | (struct serial_struct *) arg); | |
1da177e4 | 956 | case TIOCSSERIAL: |
467712c9 | 957 | return set_serial_info(info, tty, |
1da177e4 LT |
958 | (struct serial_struct *) arg); |
959 | case TIOCSERGETLSR: /* Get line status register */ | |
5d56356a | 960 | return get_lsr_info(info, (unsigned int *) arg); |
1da177e4 | 961 | case TIOCSERGSTRUCT: |
5d56356a KV |
962 | if (copy_to_user((struct m68k_serial *) arg, |
963 | info, sizeof(struct m68k_serial))) | |
1da177e4 | 964 | return -EFAULT; |
1da177e4 | 965 | return 0; |
1da177e4 LT |
966 | default: |
967 | return -ENOIOCTLCMD; | |
968 | } | |
969 | return 0; | |
970 | } | |
971 | ||
606d099c | 972 | static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios) |
1da177e4 LT |
973 | { |
974 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
975 | ||
467712c9 | 976 | change_speed(info, tty); |
1da177e4 LT |
977 | |
978 | if ((old_termios->c_cflag & CRTSCTS) && | |
ee797069 | 979 | !(tty->termios.c_cflag & CRTSCTS)) |
1da177e4 | 980 | rs_start(tty); |
1da177e4 LT |
981 | |
982 | } | |
983 | ||
984 | /* | |
985 | * ------------------------------------------------------------ | |
986 | * rs_close() | |
987 | * | |
988 | * This routine is called when the serial port gets closed. First, we | |
989 | * wait for the last remaining data to be sent. Then, we unlink its | |
990 | * S structure from the interrupt chain if necessary, and we free | |
991 | * that IRQ if nothing is left in the chain. | |
992 | * ------------------------------------------------------------ | |
993 | */ | |
994 | static void rs_close(struct tty_struct *tty, struct file * filp) | |
995 | { | |
996 | struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; | |
86264341 | 997 | struct tty_port *port = &info->tport; |
1da177e4 LT |
998 | m68328_uart *uart = &uart_addr[info->line]; |
999 | unsigned long flags; | |
1000 | ||
9ef20d52 | 1001 | if (serial_paranoia_check(info, tty->name, "rs_close")) |
1da177e4 LT |
1002 | return; |
1003 | ||
727dda80 | 1004 | local_irq_save(flags); |
1da177e4 LT |
1005 | |
1006 | if (tty_hung_up_p(filp)) { | |
727dda80 | 1007 | local_irq_restore(flags); |
1da177e4 LT |
1008 | return; |
1009 | } | |
1010 | ||
86264341 | 1011 | if ((tty->count == 1) && (port->count != 1)) { |
1da177e4 LT |
1012 | /* |
1013 | * Uh, oh. tty->count is 1, which means that the tty | |
1014 | * structure will be freed. Info->count should always | |
1015 | * be one in these conditions. If it's greater than | |
1016 | * one, we've got real problems, since it means the | |
1017 | * serial port won't be shutdown. | |
1018 | */ | |
1019 | printk("rs_close: bad serial port count; tty->count is 1, " | |
86264341 JS |
1020 | "port->count is %d\n", port->count); |
1021 | port->count = 1; | |
1da177e4 | 1022 | } |
86264341 | 1023 | if (--port->count < 0) { |
1da177e4 | 1024 | printk("rs_close: bad serial port count for ttyS%d: %d\n", |
86264341 JS |
1025 | info->line, port->count); |
1026 | port->count = 0; | |
1da177e4 | 1027 | } |
86264341 | 1028 | if (port->count) { |
727dda80 | 1029 | local_irq_restore(flags); |
1da177e4 LT |
1030 | return; |
1031 | } | |
a85dd82c | 1032 | port->flags |= ASYNC_CLOSING; |
1da177e4 LT |
1033 | /* |
1034 | * Now we wait for the transmit buffer to clear; and we notify | |
1035 | * the line discipline to only process XON/XOFF characters. | |
1036 | */ | |
1037 | tty->closing = 1; | |
4a85b1fc JS |
1038 | if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE) |
1039 | tty_wait_until_sent(tty, port->closing_wait); | |
1da177e4 LT |
1040 | /* |
1041 | * At this point we stop accepting input. To do this, we | |
1042 | * disable the receive line status interrupts, and tell the | |
1043 | * interrupt driver to stop checking the data ready bit in the | |
1044 | * line status register. | |
1045 | */ | |
1046 | ||
1047 | uart->ustcnt &= ~USTCNT_RXEN; | |
1048 | uart->ustcnt &= ~(USTCNT_RXEN | USTCNT_RX_INTR_MASK); | |
1049 | ||
467712c9 | 1050 | shutdown(info, tty); |
978e595f | 1051 | rs_flush_buffer(tty); |
1da177e4 LT |
1052 | |
1053 | tty_ldisc_flush(tty); | |
1054 | tty->closing = 0; | |
665569d0 | 1055 | tty_port_tty_set(&info->tport, NULL); |
1da177e4 LT |
1056 | #warning "This is not and has never been valid so fix it" |
1057 | #if 0 | |
1058 | if (tty->ldisc.num != ldiscs[N_TTY].num) { | |
1059 | if (tty->ldisc.close) | |
1060 | (tty->ldisc.close)(tty); | |
1061 | tty->ldisc = ldiscs[N_TTY]; | |
3dd332c5 | 1062 | tty->termios.c_line = N_TTY; |
1da177e4 LT |
1063 | if (tty->ldisc.open) |
1064 | (tty->ldisc.open)(tty); | |
1065 | } | |
1066 | #endif | |
86264341 | 1067 | if (port->blocked_open) { |
4a85b1fc JS |
1068 | if (port->close_delay) |
1069 | msleep_interruptible(jiffies_to_msecs(port->close_delay)); | |
c26f0115 | 1070 | wake_up_interruptible(&port->open_wait); |
1da177e4 | 1071 | } |
a85dd82c | 1072 | port->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING); |
c26f0115 | 1073 | wake_up_interruptible(&port->close_wait); |
727dda80 | 1074 | local_irq_restore(flags); |
1da177e4 LT |
1075 | } |
1076 | ||
1077 | /* | |
1078 | * rs_hangup() --- called by tty_hangup() when a hangup is signaled. | |
1079 | */ | |
1080 | void rs_hangup(struct tty_struct *tty) | |
1081 | { | |
1082 | struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; | |
1083 | ||
1084 | if (serial_paranoia_check(info, tty->name, "rs_hangup")) | |
1085 | return; | |
1086 | ||
1087 | rs_flush_buffer(tty); | |
467712c9 | 1088 | shutdown(info, tty); |
86264341 | 1089 | info->tport.count = 0; |
a85dd82c | 1090 | info->tport.flags &= ~ASYNC_NORMAL_ACTIVE; |
665569d0 | 1091 | tty_port_tty_set(&info->tport, NULL); |
c26f0115 | 1092 | wake_up_interruptible(&info->tport.open_wait); |
1da177e4 LT |
1093 | } |
1094 | ||
1da177e4 LT |
1095 | /* |
1096 | * This routine is called whenever a serial port is opened. It | |
1097 | * enables interrupts for a serial port, linking in its S structure into | |
1098 | * the IRQ chain. It also performs the serial-specific | |
1099 | * initialization for the tty structure. | |
1100 | */ | |
1101 | int rs_open(struct tty_struct *tty, struct file * filp) | |
1102 | { | |
1103 | struct m68k_serial *info; | |
410235fd | 1104 | int retval; |
1da177e4 | 1105 | |
410235fd | 1106 | info = &m68k_soft[tty->index]; |
1da177e4 LT |
1107 | |
1108 | if (serial_paranoia_check(info, tty->name, "rs_open")) | |
1109 | return -ENODEV; | |
1110 | ||
86264341 | 1111 | info->tport.count++; |
1da177e4 | 1112 | tty->driver_data = info; |
665569d0 | 1113 | tty_port_tty_set(&info->tport, tty); |
1da177e4 LT |
1114 | |
1115 | /* | |
1116 | * Start up serial port | |
1117 | */ | |
467712c9 | 1118 | retval = startup(info, tty); |
1da177e4 LT |
1119 | if (retval) |
1120 | return retval; | |
1121 | ||
8e328416 | 1122 | return tty_port_block_til_ready(&info->tport, tty, filp); |
1da177e4 LT |
1123 | } |
1124 | ||
1125 | /* Finally, routines used to initialize the serial driver. */ | |
1126 | ||
1127 | static void show_serial_version(void) | |
1128 | { | |
1129 | printk("MC68328 serial driver version 1.00\n"); | |
1130 | } | |
1131 | ||
b68e31d0 | 1132 | static const struct tty_operations rs_ops = { |
1da177e4 LT |
1133 | .open = rs_open, |
1134 | .close = rs_close, | |
1135 | .write = rs_write, | |
1136 | .flush_chars = rs_flush_chars, | |
1137 | .write_room = rs_write_room, | |
1138 | .chars_in_buffer = rs_chars_in_buffer, | |
1139 | .flush_buffer = rs_flush_buffer, | |
1140 | .ioctl = rs_ioctl, | |
1141 | .throttle = rs_throttle, | |
1142 | .unthrottle = rs_unthrottle, | |
1143 | .set_termios = rs_set_termios, | |
1144 | .stop = rs_stop, | |
1145 | .start = rs_start, | |
1146 | .hangup = rs_hangup, | |
1147 | .set_ldisc = rs_set_ldisc, | |
1148 | }; | |
1149 | ||
8e328416 JS |
1150 | static const struct tty_port_operations rs_port_ops = { |
1151 | }; | |
1152 | ||
1da177e4 LT |
1153 | /* rs_init inits the driver */ |
1154 | static int __init | |
1155 | rs68328_init(void) | |
1156 | { | |
107afb7a JS |
1157 | unsigned long flags; |
1158 | int i; | |
1da177e4 LT |
1159 | struct m68k_serial *info; |
1160 | ||
1161 | serial_driver = alloc_tty_driver(NR_PORTS); | |
1162 | if (!serial_driver) | |
1163 | return -ENOMEM; | |
1164 | ||
1165 | show_serial_version(); | |
1166 | ||
1167 | /* Initialize the tty_driver structure */ | |
1168 | /* SPARC: Not all of this is exactly right for us. */ | |
1169 | ||
1170 | serial_driver->name = "ttyS"; | |
1171 | serial_driver->major = TTY_MAJOR; | |
1172 | serial_driver->minor_start = 64; | |
1173 | serial_driver->type = TTY_DRIVER_TYPE_SERIAL; | |
1174 | serial_driver->subtype = SERIAL_TYPE_NORMAL; | |
1175 | serial_driver->init_termios = tty_std_termios; | |
1176 | serial_driver->init_termios.c_cflag = | |
1177 | m68328_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL; | |
1178 | serial_driver->flags = TTY_DRIVER_REAL_RAW; | |
1179 | tty_set_operations(serial_driver, &rs_ops); | |
1180 | ||
727dda80 | 1181 | local_irq_save(flags); |
1da177e4 LT |
1182 | |
1183 | for(i=0;i<NR_PORTS;i++) { | |
1184 | ||
1185 | info = &m68k_soft[i]; | |
86264341 | 1186 | tty_port_init(&info->tport); |
8e328416 | 1187 | info->tport.ops = &rs_port_ops; |
1da177e4 LT |
1188 | info->magic = SERIAL_MAGIC; |
1189 | info->port = (int) &uart_addr[i]; | |
1da177e4 LT |
1190 | info->irq = uart_irqs[i]; |
1191 | info->custom_divisor = 16; | |
1da177e4 | 1192 | info->x_char = 0; |
1da177e4 LT |
1193 | info->line = i; |
1194 | info->is_cons = 1; /* Means shortcuts work */ | |
1195 | ||
1196 | printk("%s%d at 0x%08x (irq = %d)", serial_driver->name, info->line, | |
1197 | info->port, info->irq); | |
1198 | printk(" is a builtin MC68328 UART\n"); | |
1199 | ||
1da177e4 LT |
1200 | #ifdef CONFIG_M68VZ328 |
1201 | if (i > 0 ) | |
1202 | PJSEL &= 0xCF; /* PSW enable second port output */ | |
1203 | #endif | |
1204 | ||
1205 | if (request_irq(uart_irqs[i], | |
1206 | rs_interrupt, | |
9cfb5c05 | 1207 | 0, |
25db8ad5 | 1208 | "M68328_UART", info)) |
1da177e4 | 1209 | panic("Unable to attach 68328 serial interrupt\n"); |
b19e2ca7 JS |
1210 | |
1211 | tty_port_link_device(&info->tport, serial_driver, i); | |
1da177e4 | 1212 | } |
727dda80 | 1213 | local_irq_restore(flags); |
b19e2ca7 JS |
1214 | |
1215 | if (tty_register_driver(serial_driver)) { | |
1216 | put_tty_driver(serial_driver); | |
191c5f10 JS |
1217 | for (i = 0; i < NR_PORTS; i++) |
1218 | tty_port_destroy(&m68k_soft[i].tport); | |
b19e2ca7 JS |
1219 | printk(KERN_ERR "Couldn't register serial driver\n"); |
1220 | return -ENOMEM; | |
1221 | } | |
1222 | ||
1da177e4 LT |
1223 | return 0; |
1224 | } | |
1225 | ||
1da177e4 LT |
1226 | module_init(rs68328_init); |
1227 | ||
1228 | ||
1229 | ||
1230 | static void m68328_set_baud(void) | |
1231 | { | |
1232 | unsigned short ustcnt; | |
1233 | int i; | |
1234 | ||
1235 | ustcnt = USTCNT; | |
1236 | USTCNT = ustcnt & ~USTCNT_TXEN; | |
1237 | ||
1238 | again: | |
8b505ca8 | 1239 | for (i = 0; i < ARRAY_SIZE(baud_table); i++) |
1da177e4 LT |
1240 | if (baud_table[i] == m68328_console_baud) |
1241 | break; | |
8b505ca8 | 1242 | if (i >= ARRAY_SIZE(baud_table)) { |
1da177e4 LT |
1243 | m68328_console_baud = 9600; |
1244 | goto again; | |
1245 | } | |
1246 | ||
1247 | UBAUD = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) | | |
1248 | PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale); | |
1249 | ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7); | |
1250 | ustcnt |= USTCNT_8_7; | |
1251 | ustcnt |= USTCNT_TXEN; | |
1252 | USTCNT = ustcnt; | |
1253 | m68328_console_initted = 1; | |
1254 | return; | |
1255 | } | |
1256 | ||
1257 | ||
1258 | int m68328_console_setup(struct console *cp, char *arg) | |
1259 | { | |
1260 | int i, n = CONSOLE_BAUD_RATE; | |
1261 | ||
1262 | if (!cp) | |
1263 | return(-1); | |
1264 | ||
1265 | if (arg) | |
1266 | n = simple_strtoul(arg,NULL,0); | |
1267 | ||
8b505ca8 | 1268 | for (i = 0; i < ARRAY_SIZE(baud_table); i++) |
1da177e4 LT |
1269 | if (baud_table[i] == n) |
1270 | break; | |
e9a137cb | 1271 | if (i < ARRAY_SIZE(baud_table)) { |
1da177e4 LT |
1272 | m68328_console_baud = n; |
1273 | m68328_console_cbaud = 0; | |
1274 | if (i > 15) { | |
1275 | m68328_console_cbaud |= CBAUDEX; | |
1276 | i -= 15; | |
1277 | } | |
1278 | m68328_console_cbaud |= i; | |
1279 | } | |
1280 | ||
1281 | m68328_set_baud(); /* make sure baud rate changes */ | |
1282 | return(0); | |
1283 | } | |
1284 | ||
1285 | ||
1286 | static struct tty_driver *m68328_console_device(struct console *c, int *index) | |
1287 | { | |
1288 | *index = c->index; | |
1289 | return serial_driver; | |
1290 | } | |
1291 | ||
1292 | ||
1293 | void m68328_console_write (struct console *co, const char *str, | |
1294 | unsigned int count) | |
1295 | { | |
1296 | if (!m68328_console_initted) | |
1297 | m68328_set_baud(); | |
1298 | while (count--) { | |
1299 | if (*str == '\n') | |
1300 | rs_put_char('\r'); | |
1301 | rs_put_char( *str++ ); | |
1302 | } | |
1303 | } | |
1304 | ||
1305 | ||
1306 | static struct console m68328_driver = { | |
1307 | .name = "ttyS", | |
1308 | .write = m68328_console_write, | |
1309 | .device = m68328_console_device, | |
1310 | .setup = m68328_console_setup, | |
1311 | .flags = CON_PRINTBUFFER, | |
1312 | .index = -1, | |
1313 | }; | |
1314 | ||
1315 | ||
1316 | static int __init m68328_console_init(void) | |
1317 | { | |
1318 | register_console(&m68328_driver); | |
1319 | return 0; | |
1320 | } | |
1321 | ||
1322 | console_initcall(m68328_console_init); |