Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/drivers/serial/pmac_zilog.c | |
3 | * | |
4 | * Driver for PowerMac Z85c30 based ESCC cell found in the | |
5 | * "macio" ASICs of various PowerMac models | |
6 | * | |
7 | * Copyright (C) 2003 Ben. Herrenschmidt (benh@kernel.crashing.org) | |
8 | * | |
9 | * Derived from drivers/macintosh/macserial.c by Paul Mackerras | |
10 | * and drivers/serial/sunzilog.c by David S. Miller | |
11 | * | |
12 | * Hrm... actually, I ripped most of sunzilog (Thanks David !) and | |
13 | * adapted special tweaks needed for us. I don't think it's worth | |
14 | * merging back those though. The DMA code still has to get in | |
15 | * and once done, I expect that driver to remain fairly stable in | |
16 | * the long term, unless we change the driver model again... | |
17 | * | |
18 | * This program is free software; you can redistribute it and/or modify | |
19 | * it under the terms of the GNU General Public License as published by | |
20 | * the Free Software Foundation; either version 2 of the License, or | |
21 | * (at your option) any later version. | |
22 | * | |
23 | * This program is distributed in the hope that it will be useful, | |
24 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
25 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
26 | * GNU General Public License for more details. | |
27 | * | |
28 | * You should have received a copy of the GNU General Public License | |
29 | * along with this program; if not, write to the Free Software | |
30 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
31 | * | |
32 | * 2004-08-06 Harald Welte <laforge@gnumonks.org> | |
33 | * - Enable BREAK interrupt | |
34 | * - Add support for sysreq | |
35 | * | |
36 | * TODO: - Add DMA support | |
37 | * - Defer port shutdown to a few seconds after close | |
38 | * - maybe put something right into uap->clk_divisor | |
39 | */ | |
40 | ||
41 | #undef DEBUG | |
42 | #undef DEBUG_HARD | |
43 | #undef USE_CTRL_O_SYSRQ | |
44 | ||
1da177e4 LT |
45 | #include <linux/module.h> |
46 | #include <linux/tty.h> | |
47 | ||
48 | #include <linux/tty_flip.h> | |
49 | #include <linux/major.h> | |
50 | #include <linux/string.h> | |
51 | #include <linux/fcntl.h> | |
52 | #include <linux/mm.h> | |
53 | #include <linux/kernel.h> | |
54 | #include <linux/delay.h> | |
55 | #include <linux/init.h> | |
56 | #include <linux/console.h> | |
57 | #include <linux/slab.h> | |
58 | #include <linux/adb.h> | |
59 | #include <linux/pmu.h> | |
60 | #include <linux/bitops.h> | |
61 | #include <linux/sysrq.h> | |
f392ecfa | 62 | #include <linux/mutex.h> |
1da177e4 LT |
63 | #include <asm/sections.h> |
64 | #include <asm/io.h> | |
65 | #include <asm/irq.h> | |
66 | #include <asm/prom.h> | |
67 | #include <asm/machdep.h> | |
68 | #include <asm/pmac_feature.h> | |
69 | #include <asm/dbdma.h> | |
70 | #include <asm/macio.h> | |
1da177e4 LT |
71 | |
72 | #if defined (CONFIG_SERIAL_PMACZILOG_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) | |
73 | #define SUPPORT_SYSRQ | |
74 | #endif | |
75 | ||
76 | #include <linux/serial.h> | |
77 | #include <linux/serial_core.h> | |
78 | ||
79 | #include "pmac_zilog.h" | |
80 | ||
81 | /* Not yet implemented */ | |
82 | #undef HAS_DBDMA | |
83 | ||
84 | static char version[] __initdata = "pmac_zilog: 0.6 (Benjamin Herrenschmidt <benh@kernel.crashing.org>)"; | |
85 | MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); | |
86 | MODULE_DESCRIPTION("Driver for the PowerMac serial ports."); | |
87 | MODULE_LICENSE("GPL"); | |
88 | ||
89 | #define PWRDBG(fmt, arg...) printk(KERN_DEBUG fmt , ## arg) | |
90 | ||
e4533b24 DW |
91 | #ifdef CONFIG_SERIAL_PMACZILOG_TTYS |
92 | #define PMACZILOG_MAJOR TTY_MAJOR | |
93 | #define PMACZILOG_MINOR 64 | |
94 | #define PMACZILOG_NAME "ttyS" | |
95 | #else | |
96 | #define PMACZILOG_MAJOR 204 | |
97 | #define PMACZILOG_MINOR 192 | |
98 | #define PMACZILOG_NAME "ttyPZ" | |
99 | #endif | |
100 | ||
1da177e4 LT |
101 | |
102 | /* | |
103 | * For the sake of early serial console, we can do a pre-probe | |
104 | * (optional) of the ports at rather early boot time. | |
105 | */ | |
106 | static struct uart_pmac_port pmz_ports[MAX_ZS_PORTS]; | |
107 | static int pmz_ports_count; | |
f392ecfa | 108 | static DEFINE_MUTEX(pmz_irq_mutex); |
1da177e4 LT |
109 | |
110 | static struct uart_driver pmz_uart_reg = { | |
111 | .owner = THIS_MODULE, | |
e4533b24 DW |
112 | .driver_name = PMACZILOG_NAME, |
113 | .dev_name = PMACZILOG_NAME, | |
114 | .major = PMACZILOG_MAJOR, | |
115 | .minor = PMACZILOG_MINOR, | |
1da177e4 LT |
116 | }; |
117 | ||
118 | ||
119 | /* | |
120 | * Load all registers to reprogram the port | |
121 | * This function must only be called when the TX is not busy. The UART | |
122 | * port lock must be held and local interrupts disabled. | |
123 | */ | |
124 | static void pmz_load_zsregs(struct uart_pmac_port *uap, u8 *regs) | |
125 | { | |
126 | int i; | |
127 | ||
128 | if (ZS_IS_ASLEEP(uap)) | |
129 | return; | |
130 | ||
131 | /* Let pending transmits finish. */ | |
132 | for (i = 0; i < 1000; i++) { | |
133 | unsigned char stat = read_zsreg(uap, R1); | |
134 | if (stat & ALL_SNT) | |
135 | break; | |
136 | udelay(100); | |
137 | } | |
138 | ||
139 | ZS_CLEARERR(uap); | |
140 | zssync(uap); | |
141 | ZS_CLEARFIFO(uap); | |
142 | zssync(uap); | |
143 | ZS_CLEARERR(uap); | |
144 | ||
145 | /* Disable all interrupts. */ | |
146 | write_zsreg(uap, R1, | |
147 | regs[R1] & ~(RxINT_MASK | TxINT_ENAB | EXT_INT_ENAB)); | |
148 | ||
149 | /* Set parity, sync config, stop bits, and clock divisor. */ | |
150 | write_zsreg(uap, R4, regs[R4]); | |
151 | ||
152 | /* Set misc. TX/RX control bits. */ | |
153 | write_zsreg(uap, R10, regs[R10]); | |
154 | ||
155 | /* Set TX/RX controls sans the enable bits. */ | |
156 | write_zsreg(uap, R3, regs[R3] & ~RxENABLE); | |
157 | write_zsreg(uap, R5, regs[R5] & ~TxENABLE); | |
158 | ||
159 | /* now set R7 "prime" on ESCC */ | |
160 | write_zsreg(uap, R15, regs[R15] | EN85C30); | |
161 | write_zsreg(uap, R7, regs[R7P]); | |
162 | ||
163 | /* make sure we use R7 "non-prime" on ESCC */ | |
164 | write_zsreg(uap, R15, regs[R15] & ~EN85C30); | |
165 | ||
166 | /* Synchronous mode config. */ | |
167 | write_zsreg(uap, R6, regs[R6]); | |
168 | write_zsreg(uap, R7, regs[R7]); | |
169 | ||
170 | /* Disable baud generator. */ | |
171 | write_zsreg(uap, R14, regs[R14] & ~BRENAB); | |
172 | ||
173 | /* Clock mode control. */ | |
174 | write_zsreg(uap, R11, regs[R11]); | |
175 | ||
176 | /* Lower and upper byte of baud rate generator divisor. */ | |
177 | write_zsreg(uap, R12, regs[R12]); | |
178 | write_zsreg(uap, R13, regs[R13]); | |
179 | ||
180 | /* Now rewrite R14, with BRENAB (if set). */ | |
181 | write_zsreg(uap, R14, regs[R14]); | |
182 | ||
183 | /* Reset external status interrupts. */ | |
184 | write_zsreg(uap, R0, RES_EXT_INT); | |
185 | write_zsreg(uap, R0, RES_EXT_INT); | |
186 | ||
187 | /* Rewrite R3/R5, this time without enables masked. */ | |
188 | write_zsreg(uap, R3, regs[R3]); | |
189 | write_zsreg(uap, R5, regs[R5]); | |
190 | ||
191 | /* Rewrite R1, this time without IRQ enabled masked. */ | |
192 | write_zsreg(uap, R1, regs[R1]); | |
193 | ||
194 | /* Enable interrupts */ | |
195 | write_zsreg(uap, R9, regs[R9]); | |
196 | } | |
197 | ||
198 | /* | |
199 | * We do like sunzilog to avoid disrupting pending Tx | |
200 | * Reprogram the Zilog channel HW registers with the copies found in the | |
201 | * software state struct. If the transmitter is busy, we defer this update | |
202 | * until the next TX complete interrupt. Else, we do it right now. | |
203 | * | |
204 | * The UART port lock must be held and local interrupts disabled. | |
205 | */ | |
206 | static void pmz_maybe_update_regs(struct uart_pmac_port *uap) | |
207 | { | |
208 | if (!ZS_REGS_HELD(uap)) { | |
209 | if (ZS_TX_ACTIVE(uap)) { | |
210 | uap->flags |= PMACZILOG_FLAG_REGS_HELD; | |
211 | } else { | |
212 | pmz_debug("pmz: maybe_update_regs: updating\n"); | |
213 | pmz_load_zsregs(uap, uap->curregs); | |
214 | } | |
215 | } | |
216 | } | |
217 | ||
7d12e780 | 218 | static struct tty_struct *pmz_receive_chars(struct uart_pmac_port *uap) |
1da177e4 LT |
219 | { |
220 | struct tty_struct *tty = NULL; | |
33f0f88f | 221 | unsigned char ch, r1, drop, error, flag; |
1da177e4 LT |
222 | int loops = 0; |
223 | ||
1da177e4 LT |
224 | /* The interrupt can be enabled when the port isn't open, typically |
225 | * that happens when using one port is open and the other closed (stale | |
226 | * interrupt) or when one port is used as a console. | |
227 | */ | |
228 | if (!ZS_IS_OPEN(uap)) { | |
229 | pmz_debug("pmz: draining input\n"); | |
230 | /* Port is closed, drain input data */ | |
231 | for (;;) { | |
232 | if ((++loops) > 1000) | |
233 | goto flood; | |
234 | (void)read_zsreg(uap, R1); | |
235 | write_zsreg(uap, R0, ERR_RES); | |
236 | (void)read_zsdata(uap); | |
237 | ch = read_zsreg(uap, R0); | |
238 | if (!(ch & Rx_CH_AV)) | |
239 | break; | |
240 | } | |
241 | return NULL; | |
242 | } | |
243 | ||
244 | /* Sanity check, make sure the old bug is no longer happening */ | |
87c25ef0 | 245 | if (uap->port.info == NULL || uap->port.info->port.tty == NULL) { |
1da177e4 LT |
246 | WARN_ON(1); |
247 | (void)read_zsdata(uap); | |
248 | return NULL; | |
249 | } | |
87c25ef0 | 250 | tty = uap->port.info->port.tty; |
1da177e4 LT |
251 | |
252 | while (1) { | |
253 | error = 0; | |
254 | drop = 0; | |
255 | ||
1da177e4 LT |
256 | r1 = read_zsreg(uap, R1); |
257 | ch = read_zsdata(uap); | |
258 | ||
259 | if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR)) { | |
260 | write_zsreg(uap, R0, ERR_RES); | |
261 | zssync(uap); | |
262 | } | |
263 | ||
264 | ch &= uap->parity_mask; | |
265 | if (ch == 0 && uap->flags & PMACZILOG_FLAG_BREAK) { | |
266 | uap->flags &= ~PMACZILOG_FLAG_BREAK; | |
267 | } | |
268 | ||
269 | #if defined(CONFIG_MAGIC_SYSRQ) && defined(CONFIG_SERIAL_CORE_CONSOLE) | |
270 | #ifdef USE_CTRL_O_SYSRQ | |
271 | /* Handle the SysRq ^O Hack */ | |
272 | if (ch == '\x0f') { | |
273 | uap->port.sysrq = jiffies + HZ*5; | |
274 | goto next_char; | |
275 | } | |
276 | #endif /* USE_CTRL_O_SYSRQ */ | |
277 | if (uap->port.sysrq) { | |
278 | int swallow; | |
279 | spin_unlock(&uap->port.lock); | |
7d12e780 | 280 | swallow = uart_handle_sysrq_char(&uap->port, ch); |
1da177e4 LT |
281 | spin_lock(&uap->port.lock); |
282 | if (swallow) | |
283 | goto next_char; | |
284 | } | |
285 | #endif /* CONFIG_MAGIC_SYSRQ && CONFIG_SERIAL_CORE_CONSOLE */ | |
286 | ||
287 | /* A real serial line, record the character and status. */ | |
288 | if (drop) | |
289 | goto next_char; | |
290 | ||
33f0f88f | 291 | flag = TTY_NORMAL; |
1da177e4 LT |
292 | uap->port.icount.rx++; |
293 | ||
294 | if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR | BRK_ABRT)) { | |
295 | error = 1; | |
296 | if (r1 & BRK_ABRT) { | |
297 | pmz_debug("pmz: got break !\n"); | |
298 | r1 &= ~(PAR_ERR | CRC_ERR); | |
299 | uap->port.icount.brk++; | |
300 | if (uart_handle_break(&uap->port)) | |
301 | goto next_char; | |
302 | } | |
303 | else if (r1 & PAR_ERR) | |
304 | uap->port.icount.parity++; | |
305 | else if (r1 & CRC_ERR) | |
306 | uap->port.icount.frame++; | |
307 | if (r1 & Rx_OVR) | |
308 | uap->port.icount.overrun++; | |
309 | r1 &= uap->port.read_status_mask; | |
310 | if (r1 & BRK_ABRT) | |
33f0f88f | 311 | flag = TTY_BREAK; |
1da177e4 | 312 | else if (r1 & PAR_ERR) |
33f0f88f | 313 | flag = TTY_PARITY; |
1da177e4 | 314 | else if (r1 & CRC_ERR) |
33f0f88f | 315 | flag = TTY_FRAME; |
1da177e4 LT |
316 | } |
317 | ||
318 | if (uap->port.ignore_status_mask == 0xff || | |
319 | (r1 & uap->port.ignore_status_mask) == 0) { | |
33f0f88f | 320 | tty_insert_flip_char(tty, ch, flag); |
1da177e4 | 321 | } |
33f0f88f AC |
322 | if (r1 & Rx_OVR) |
323 | tty_insert_flip_char(tty, 0, TTY_OVERRUN); | |
1da177e4 LT |
324 | next_char: |
325 | /* We can get stuck in an infinite loop getting char 0 when the | |
326 | * line is in a wrong HW state, we break that here. | |
327 | * When that happens, I disable the receive side of the driver. | |
328 | * Note that what I've been experiencing is a real irq loop where | |
329 | * I'm getting flooded regardless of the actual port speed. | |
330 | * Something stange is going on with the HW | |
331 | */ | |
332 | if ((++loops) > 1000) | |
333 | goto flood; | |
334 | ch = read_zsreg(uap, R0); | |
335 | if (!(ch & Rx_CH_AV)) | |
336 | break; | |
337 | } | |
338 | ||
339 | return tty; | |
340 | flood: | |
341 | uap->curregs[R1] &= ~(EXT_INT_ENAB | TxINT_ENAB | RxINT_MASK); | |
342 | write_zsreg(uap, R1, uap->curregs[R1]); | |
343 | zssync(uap); | |
344 | dev_err(&uap->dev->ofdev.dev, "pmz: rx irq flood !\n"); | |
345 | return tty; | |
346 | } | |
347 | ||
7d12e780 | 348 | static void pmz_status_handle(struct uart_pmac_port *uap) |
1da177e4 LT |
349 | { |
350 | unsigned char status; | |
351 | ||
352 | status = read_zsreg(uap, R0); | |
353 | write_zsreg(uap, R0, RES_EXT_INT); | |
354 | zssync(uap); | |
355 | ||
356 | if (ZS_IS_OPEN(uap) && ZS_WANTS_MODEM_STATUS(uap)) { | |
357 | if (status & SYNC_HUNT) | |
358 | uap->port.icount.dsr++; | |
359 | ||
360 | /* The Zilog just gives us an interrupt when DCD/CTS/etc. change. | |
361 | * But it does not tell us which bit has changed, we have to keep | |
362 | * track of this ourselves. | |
363 | * The CTS input is inverted for some reason. -- paulus | |
364 | */ | |
365 | if ((status ^ uap->prev_status) & DCD) | |
366 | uart_handle_dcd_change(&uap->port, | |
367 | (status & DCD)); | |
368 | if ((status ^ uap->prev_status) & CTS) | |
369 | uart_handle_cts_change(&uap->port, | |
370 | !(status & CTS)); | |
371 | ||
372 | wake_up_interruptible(&uap->port.info->delta_msr_wait); | |
373 | } | |
374 | ||
375 | if (status & BRK_ABRT) | |
376 | uap->flags |= PMACZILOG_FLAG_BREAK; | |
377 | ||
378 | uap->prev_status = status; | |
379 | } | |
380 | ||
381 | static void pmz_transmit_chars(struct uart_pmac_port *uap) | |
382 | { | |
383 | struct circ_buf *xmit; | |
384 | ||
385 | if (ZS_IS_ASLEEP(uap)) | |
386 | return; | |
387 | if (ZS_IS_CONS(uap)) { | |
388 | unsigned char status = read_zsreg(uap, R0); | |
389 | ||
390 | /* TX still busy? Just wait for the next TX done interrupt. | |
391 | * | |
392 | * It can occur because of how we do serial console writes. It would | |
393 | * be nice to transmit console writes just like we normally would for | |
394 | * a TTY line. (ie. buffered and TX interrupt driven). That is not | |
395 | * easy because console writes cannot sleep. One solution might be | |
396 | * to poll on enough port->xmit space becomming free. -DaveM | |
397 | */ | |
398 | if (!(status & Tx_BUF_EMP)) | |
399 | return; | |
400 | } | |
401 | ||
402 | uap->flags &= ~PMACZILOG_FLAG_TX_ACTIVE; | |
403 | ||
404 | if (ZS_REGS_HELD(uap)) { | |
405 | pmz_load_zsregs(uap, uap->curregs); | |
406 | uap->flags &= ~PMACZILOG_FLAG_REGS_HELD; | |
407 | } | |
408 | ||
409 | if (ZS_TX_STOPPED(uap)) { | |
410 | uap->flags &= ~PMACZILOG_FLAG_TX_STOPPED; | |
411 | goto ack_tx_int; | |
412 | } | |
413 | ||
414 | if (uap->port.x_char) { | |
415 | uap->flags |= PMACZILOG_FLAG_TX_ACTIVE; | |
416 | write_zsdata(uap, uap->port.x_char); | |
417 | zssync(uap); | |
418 | uap->port.icount.tx++; | |
419 | uap->port.x_char = 0; | |
420 | return; | |
421 | } | |
422 | ||
423 | if (uap->port.info == NULL) | |
424 | goto ack_tx_int; | |
425 | xmit = &uap->port.info->xmit; | |
426 | if (uart_circ_empty(xmit)) { | |
427 | uart_write_wakeup(&uap->port); | |
428 | goto ack_tx_int; | |
429 | } | |
430 | if (uart_tx_stopped(&uap->port)) | |
431 | goto ack_tx_int; | |
432 | ||
433 | uap->flags |= PMACZILOG_FLAG_TX_ACTIVE; | |
434 | write_zsdata(uap, xmit->buf[xmit->tail]); | |
435 | zssync(uap); | |
436 | ||
437 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
438 | uap->port.icount.tx++; | |
439 | ||
440 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
441 | uart_write_wakeup(&uap->port); | |
442 | ||
443 | return; | |
444 | ||
445 | ack_tx_int: | |
446 | write_zsreg(uap, R0, RES_Tx_P); | |
447 | zssync(uap); | |
448 | } | |
449 | ||
450 | /* Hrm... we register that twice, fixme later.... */ | |
7d12e780 | 451 | static irqreturn_t pmz_interrupt(int irq, void *dev_id) |
1da177e4 LT |
452 | { |
453 | struct uart_pmac_port *uap = dev_id; | |
454 | struct uart_pmac_port *uap_a; | |
455 | struct uart_pmac_port *uap_b; | |
456 | int rc = IRQ_NONE; | |
457 | struct tty_struct *tty; | |
458 | u8 r3; | |
459 | ||
460 | uap_a = pmz_get_port_A(uap); | |
461 | uap_b = uap_a->mate; | |
462 | ||
463 | spin_lock(&uap_a->port.lock); | |
464 | r3 = read_zsreg(uap_a, R3); | |
465 | ||
466 | #ifdef DEBUG_HARD | |
467 | pmz_debug("irq, r3: %x\n", r3); | |
468 | #endif | |
469 | /* Channel A */ | |
470 | tty = NULL; | |
471 | if (r3 & (CHAEXT | CHATxIP | CHARxIP)) { | |
472 | write_zsreg(uap_a, R0, RES_H_IUS); | |
473 | zssync(uap_a); | |
474 | if (r3 & CHAEXT) | |
7d12e780 | 475 | pmz_status_handle(uap_a); |
1da177e4 | 476 | if (r3 & CHARxIP) |
7d12e780 | 477 | tty = pmz_receive_chars(uap_a); |
1da177e4 LT |
478 | if (r3 & CHATxIP) |
479 | pmz_transmit_chars(uap_a); | |
480 | rc = IRQ_HANDLED; | |
481 | } | |
482 | spin_unlock(&uap_a->port.lock); | |
483 | if (tty != NULL) | |
484 | tty_flip_buffer_push(tty); | |
485 | ||
486 | if (uap_b->node == NULL) | |
487 | goto out; | |
488 | ||
489 | spin_lock(&uap_b->port.lock); | |
490 | tty = NULL; | |
491 | if (r3 & (CHBEXT | CHBTxIP | CHBRxIP)) { | |
492 | write_zsreg(uap_b, R0, RES_H_IUS); | |
493 | zssync(uap_b); | |
494 | if (r3 & CHBEXT) | |
7d12e780 | 495 | pmz_status_handle(uap_b); |
1da177e4 | 496 | if (r3 & CHBRxIP) |
7d12e780 | 497 | tty = pmz_receive_chars(uap_b); |
1da177e4 LT |
498 | if (r3 & CHBTxIP) |
499 | pmz_transmit_chars(uap_b); | |
500 | rc = IRQ_HANDLED; | |
501 | } | |
502 | spin_unlock(&uap_b->port.lock); | |
503 | if (tty != NULL) | |
504 | tty_flip_buffer_push(tty); | |
505 | ||
506 | out: | |
507 | #ifdef DEBUG_HARD | |
508 | pmz_debug("irq done.\n"); | |
509 | #endif | |
510 | return rc; | |
511 | } | |
512 | ||
513 | /* | |
514 | * Peek the status register, lock not held by caller | |
515 | */ | |
516 | static inline u8 pmz_peek_status(struct uart_pmac_port *uap) | |
517 | { | |
518 | unsigned long flags; | |
519 | u8 status; | |
520 | ||
521 | spin_lock_irqsave(&uap->port.lock, flags); | |
522 | status = read_zsreg(uap, R0); | |
523 | spin_unlock_irqrestore(&uap->port.lock, flags); | |
524 | ||
525 | return status; | |
526 | } | |
527 | ||
528 | /* | |
529 | * Check if transmitter is empty | |
530 | * The port lock is not held. | |
531 | */ | |
532 | static unsigned int pmz_tx_empty(struct uart_port *port) | |
533 | { | |
534 | struct uart_pmac_port *uap = to_pmz(port); | |
535 | unsigned char status; | |
536 | ||
537 | if (ZS_IS_ASLEEP(uap) || uap->node == NULL) | |
538 | return TIOCSER_TEMT; | |
539 | ||
540 | status = pmz_peek_status(to_pmz(port)); | |
541 | if (status & Tx_BUF_EMP) | |
542 | return TIOCSER_TEMT; | |
543 | return 0; | |
544 | } | |
545 | ||
546 | /* | |
547 | * Set Modem Control (RTS & DTR) bits | |
548 | * The port lock is held and interrupts are disabled. | |
549 | * Note: Shall we really filter out RTS on external ports or | |
550 | * should that be dealt at higher level only ? | |
551 | */ | |
552 | static void pmz_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
553 | { | |
554 | struct uart_pmac_port *uap = to_pmz(port); | |
555 | unsigned char set_bits, clear_bits; | |
556 | ||
557 | /* Do nothing for irda for now... */ | |
558 | if (ZS_IS_IRDA(uap)) | |
559 | return; | |
560 | /* We get called during boot with a port not up yet */ | |
561 | if (ZS_IS_ASLEEP(uap) || | |
562 | !(ZS_IS_OPEN(uap) || ZS_IS_CONS(uap))) | |
563 | return; | |
564 | ||
565 | set_bits = clear_bits = 0; | |
566 | ||
567 | if (ZS_IS_INTMODEM(uap)) { | |
568 | if (mctrl & TIOCM_RTS) | |
569 | set_bits |= RTS; | |
570 | else | |
571 | clear_bits |= RTS; | |
572 | } | |
573 | if (mctrl & TIOCM_DTR) | |
574 | set_bits |= DTR; | |
575 | else | |
576 | clear_bits |= DTR; | |
577 | ||
578 | /* NOTE: Not subject to 'transmitter active' rule. */ | |
579 | uap->curregs[R5] |= set_bits; | |
580 | uap->curregs[R5] &= ~clear_bits; | |
581 | if (ZS_IS_ASLEEP(uap)) | |
582 | return; | |
583 | write_zsreg(uap, R5, uap->curregs[R5]); | |
584 | pmz_debug("pmz_set_mctrl: set bits: %x, clear bits: %x -> %x\n", | |
585 | set_bits, clear_bits, uap->curregs[R5]); | |
586 | zssync(uap); | |
587 | } | |
588 | ||
589 | /* | |
590 | * Get Modem Control bits (only the input ones, the core will | |
591 | * or that with a cached value of the control ones) | |
c5f4644e | 592 | * The port lock is held and interrupts are disabled. |
1da177e4 LT |
593 | */ |
594 | static unsigned int pmz_get_mctrl(struct uart_port *port) | |
595 | { | |
596 | struct uart_pmac_port *uap = to_pmz(port); | |
597 | unsigned char status; | |
598 | unsigned int ret; | |
599 | ||
600 | if (ZS_IS_ASLEEP(uap) || uap->node == NULL) | |
601 | return 0; | |
602 | ||
c5f4644e | 603 | status = read_zsreg(uap, R0); |
1da177e4 LT |
604 | |
605 | ret = 0; | |
606 | if (status & DCD) | |
607 | ret |= TIOCM_CAR; | |
608 | if (status & SYNC_HUNT) | |
609 | ret |= TIOCM_DSR; | |
610 | if (!(status & CTS)) | |
611 | ret |= TIOCM_CTS; | |
612 | ||
613 | return ret; | |
614 | } | |
615 | ||
616 | /* | |
617 | * Stop TX side. Dealt like sunzilog at next Tx interrupt, | |
b129a8cc | 618 | * though for DMA, we will have to do a bit more. |
1da177e4 LT |
619 | * The port lock is held and interrupts are disabled. |
620 | */ | |
b129a8cc | 621 | static void pmz_stop_tx(struct uart_port *port) |
1da177e4 LT |
622 | { |
623 | to_pmz(port)->flags |= PMACZILOG_FLAG_TX_STOPPED; | |
624 | } | |
625 | ||
626 | /* | |
627 | * Kick the Tx side. | |
628 | * The port lock is held and interrupts are disabled. | |
629 | */ | |
b129a8cc | 630 | static void pmz_start_tx(struct uart_port *port) |
1da177e4 LT |
631 | { |
632 | struct uart_pmac_port *uap = to_pmz(port); | |
633 | unsigned char status; | |
634 | ||
635 | pmz_debug("pmz: start_tx()\n"); | |
636 | ||
637 | uap->flags |= PMACZILOG_FLAG_TX_ACTIVE; | |
638 | uap->flags &= ~PMACZILOG_FLAG_TX_STOPPED; | |
639 | ||
640 | if (ZS_IS_ASLEEP(uap) || uap->node == NULL) | |
641 | return; | |
642 | ||
643 | status = read_zsreg(uap, R0); | |
644 | ||
645 | /* TX busy? Just wait for the TX done interrupt. */ | |
646 | if (!(status & Tx_BUF_EMP)) | |
647 | return; | |
648 | ||
649 | /* Send the first character to jump-start the TX done | |
650 | * IRQ sending engine. | |
651 | */ | |
652 | if (port->x_char) { | |
653 | write_zsdata(uap, port->x_char); | |
654 | zssync(uap); | |
655 | port->icount.tx++; | |
656 | port->x_char = 0; | |
657 | } else { | |
658 | struct circ_buf *xmit = &port->info->xmit; | |
659 | ||
660 | write_zsdata(uap, xmit->buf[xmit->tail]); | |
661 | zssync(uap); | |
662 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
663 | port->icount.tx++; | |
664 | ||
665 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
666 | uart_write_wakeup(&uap->port); | |
667 | } | |
668 | pmz_debug("pmz: start_tx() done.\n"); | |
669 | } | |
670 | ||
671 | /* | |
672 | * Stop Rx side, basically disable emitting of | |
673 | * Rx interrupts on the port. We don't disable the rx | |
674 | * side of the chip proper though | |
675 | * The port lock is held. | |
676 | */ | |
677 | static void pmz_stop_rx(struct uart_port *port) | |
678 | { | |
679 | struct uart_pmac_port *uap = to_pmz(port); | |
680 | ||
681 | if (ZS_IS_ASLEEP(uap) || uap->node == NULL) | |
682 | return; | |
683 | ||
684 | pmz_debug("pmz: stop_rx()()\n"); | |
685 | ||
686 | /* Disable all RX interrupts. */ | |
687 | uap->curregs[R1] &= ~RxINT_MASK; | |
688 | pmz_maybe_update_regs(uap); | |
689 | ||
690 | pmz_debug("pmz: stop_rx() done.\n"); | |
691 | } | |
692 | ||
693 | /* | |
694 | * Enable modem status change interrupts | |
695 | * The port lock is held. | |
696 | */ | |
697 | static void pmz_enable_ms(struct uart_port *port) | |
698 | { | |
699 | struct uart_pmac_port *uap = to_pmz(port); | |
700 | unsigned char new_reg; | |
701 | ||
702 | if (ZS_IS_IRDA(uap) || uap->node == NULL) | |
703 | return; | |
704 | new_reg = uap->curregs[R15] | (DCDIE | SYNCIE | CTSIE); | |
705 | if (new_reg != uap->curregs[R15]) { | |
706 | uap->curregs[R15] = new_reg; | |
707 | ||
708 | if (ZS_IS_ASLEEP(uap)) | |
709 | return; | |
710 | /* NOTE: Not subject to 'transmitter active' rule. */ | |
711 | write_zsreg(uap, R15, uap->curregs[R15]); | |
712 | } | |
713 | } | |
714 | ||
715 | /* | |
716 | * Control break state emission | |
717 | * The port lock is not held. | |
718 | */ | |
719 | static void pmz_break_ctl(struct uart_port *port, int break_state) | |
720 | { | |
721 | struct uart_pmac_port *uap = to_pmz(port); | |
722 | unsigned char set_bits, clear_bits, new_reg; | |
723 | unsigned long flags; | |
724 | ||
725 | if (uap->node == NULL) | |
726 | return; | |
727 | set_bits = clear_bits = 0; | |
728 | ||
729 | if (break_state) | |
730 | set_bits |= SND_BRK; | |
731 | else | |
732 | clear_bits |= SND_BRK; | |
733 | ||
734 | spin_lock_irqsave(&port->lock, flags); | |
735 | ||
736 | new_reg = (uap->curregs[R5] | set_bits) & ~clear_bits; | |
737 | if (new_reg != uap->curregs[R5]) { | |
738 | uap->curregs[R5] = new_reg; | |
739 | ||
740 | /* NOTE: Not subject to 'transmitter active' rule. */ | |
741 | if (ZS_IS_ASLEEP(uap)) | |
742 | return; | |
743 | write_zsreg(uap, R5, uap->curregs[R5]); | |
744 | } | |
745 | ||
746 | spin_unlock_irqrestore(&port->lock, flags); | |
747 | } | |
748 | ||
749 | /* | |
750 | * Turn power on or off to the SCC and associated stuff | |
751 | * (port drivers, modem, IR port, etc.) | |
752 | * Returns the number of milliseconds we should wait before | |
753 | * trying to use the port. | |
754 | */ | |
755 | static int pmz_set_scc_power(struct uart_pmac_port *uap, int state) | |
756 | { | |
757 | int delay = 0; | |
758 | int rc; | |
759 | ||
760 | if (state) { | |
761 | rc = pmac_call_feature( | |
762 | PMAC_FTR_SCC_ENABLE, uap->node, uap->port_type, 1); | |
763 | pmz_debug("port power on result: %d\n", rc); | |
764 | if (ZS_IS_INTMODEM(uap)) { | |
765 | rc = pmac_call_feature( | |
766 | PMAC_FTR_MODEM_ENABLE, uap->node, 0, 1); | |
767 | delay = 2500; /* wait for 2.5s before using */ | |
768 | pmz_debug("modem power result: %d\n", rc); | |
769 | } | |
770 | } else { | |
771 | /* TODO: Make that depend on a timer, don't power down | |
772 | * immediately | |
773 | */ | |
774 | if (ZS_IS_INTMODEM(uap)) { | |
775 | rc = pmac_call_feature( | |
776 | PMAC_FTR_MODEM_ENABLE, uap->node, 0, 0); | |
777 | pmz_debug("port power off result: %d\n", rc); | |
778 | } | |
779 | pmac_call_feature(PMAC_FTR_SCC_ENABLE, uap->node, uap->port_type, 0); | |
780 | } | |
781 | return delay; | |
782 | } | |
783 | ||
784 | /* | |
785 | * FixZeroBug....Works around a bug in the SCC receving channel. | |
786 | * Inspired from Darwin code, 15 Sept. 2000 -DanM | |
787 | * | |
788 | * The following sequence prevents a problem that is seen with O'Hare ASICs | |
789 | * (most versions -- also with some Heathrow and Hydra ASICs) where a zero | |
790 | * at the input to the receiver becomes 'stuck' and locks up the receiver. | |
791 | * This problem can occur as a result of a zero bit at the receiver input | |
792 | * coincident with any of the following events: | |
793 | * | |
794 | * The SCC is initialized (hardware or software). | |
795 | * A framing error is detected. | |
796 | * The clocking option changes from synchronous or X1 asynchronous | |
797 | * clocking to X16, X32, or X64 asynchronous clocking. | |
798 | * The decoding mode is changed among NRZ, NRZI, FM0, or FM1. | |
799 | * | |
800 | * This workaround attempts to recover from the lockup condition by placing | |
801 | * the SCC in synchronous loopback mode with a fast clock before programming | |
802 | * any of the asynchronous modes. | |
803 | */ | |
804 | static void pmz_fix_zero_bug_scc(struct uart_pmac_port *uap) | |
805 | { | |
806 | write_zsreg(uap, 9, ZS_IS_CHANNEL_A(uap) ? CHRA : CHRB); | |
807 | zssync(uap); | |
808 | udelay(10); | |
809 | write_zsreg(uap, 9, (ZS_IS_CHANNEL_A(uap) ? CHRA : CHRB) | NV); | |
810 | zssync(uap); | |
811 | ||
812 | write_zsreg(uap, 4, X1CLK | MONSYNC); | |
813 | write_zsreg(uap, 3, Rx8); | |
814 | write_zsreg(uap, 5, Tx8 | RTS); | |
815 | write_zsreg(uap, 9, NV); /* Didn't we already do this? */ | |
816 | write_zsreg(uap, 11, RCBR | TCBR); | |
817 | write_zsreg(uap, 12, 0); | |
818 | write_zsreg(uap, 13, 0); | |
819 | write_zsreg(uap, 14, (LOOPBAK | BRSRC)); | |
820 | write_zsreg(uap, 14, (LOOPBAK | BRSRC | BRENAB)); | |
821 | write_zsreg(uap, 3, Rx8 | RxENABLE); | |
822 | write_zsreg(uap, 0, RES_EXT_INT); | |
823 | write_zsreg(uap, 0, RES_EXT_INT); | |
824 | write_zsreg(uap, 0, RES_EXT_INT); /* to kill some time */ | |
825 | ||
826 | /* The channel should be OK now, but it is probably receiving | |
827 | * loopback garbage. | |
828 | * Switch to asynchronous mode, disable the receiver, | |
829 | * and discard everything in the receive buffer. | |
830 | */ | |
831 | write_zsreg(uap, 9, NV); | |
832 | write_zsreg(uap, 4, X16CLK | SB_MASK); | |
833 | write_zsreg(uap, 3, Rx8); | |
834 | ||
835 | while (read_zsreg(uap, 0) & Rx_CH_AV) { | |
836 | (void)read_zsreg(uap, 8); | |
837 | write_zsreg(uap, 0, RES_EXT_INT); | |
838 | write_zsreg(uap, 0, ERR_RES); | |
839 | } | |
840 | } | |
841 | ||
842 | /* | |
843 | * Real startup routine, powers up the hardware and sets up | |
844 | * the SCC. Returns a delay in ms where you need to wait before | |
845 | * actually using the port, this is typically the internal modem | |
846 | * powerup delay. This routine expect the lock to be taken. | |
847 | */ | |
848 | static int __pmz_startup(struct uart_pmac_port *uap) | |
849 | { | |
850 | int pwr_delay = 0; | |
851 | ||
852 | memset(&uap->curregs, 0, sizeof(uap->curregs)); | |
853 | ||
854 | /* Power up the SCC & underlying hardware (modem/irda) */ | |
855 | pwr_delay = pmz_set_scc_power(uap, 1); | |
856 | ||
857 | /* Nice buggy HW ... */ | |
858 | pmz_fix_zero_bug_scc(uap); | |
859 | ||
860 | /* Reset the channel */ | |
861 | uap->curregs[R9] = 0; | |
862 | write_zsreg(uap, 9, ZS_IS_CHANNEL_A(uap) ? CHRA : CHRB); | |
863 | zssync(uap); | |
864 | udelay(10); | |
865 | write_zsreg(uap, 9, 0); | |
866 | zssync(uap); | |
867 | ||
868 | /* Clear the interrupt registers */ | |
869 | write_zsreg(uap, R1, 0); | |
870 | write_zsreg(uap, R0, ERR_RES); | |
871 | write_zsreg(uap, R0, ERR_RES); | |
872 | write_zsreg(uap, R0, RES_H_IUS); | |
873 | write_zsreg(uap, R0, RES_H_IUS); | |
874 | ||
875 | /* Setup some valid baud rate */ | |
876 | uap->curregs[R4] = X16CLK | SB1; | |
877 | uap->curregs[R3] = Rx8; | |
878 | uap->curregs[R5] = Tx8 | RTS; | |
879 | if (!ZS_IS_IRDA(uap)) | |
880 | uap->curregs[R5] |= DTR; | |
881 | uap->curregs[R12] = 0; | |
882 | uap->curregs[R13] = 0; | |
883 | uap->curregs[R14] = BRENAB; | |
884 | ||
885 | /* Clear handshaking, enable BREAK interrupts */ | |
886 | uap->curregs[R15] = BRKIE; | |
887 | ||
888 | /* Master interrupt enable */ | |
889 | uap->curregs[R9] |= NV | MIE; | |
890 | ||
891 | pmz_load_zsregs(uap, uap->curregs); | |
892 | ||
893 | /* Enable receiver and transmitter. */ | |
894 | write_zsreg(uap, R3, uap->curregs[R3] |= RxENABLE); | |
895 | write_zsreg(uap, R5, uap->curregs[R5] |= TxENABLE); | |
896 | ||
897 | /* Remember status for DCD/CTS changes */ | |
898 | uap->prev_status = read_zsreg(uap, R0); | |
899 | ||
900 | ||
901 | return pwr_delay; | |
902 | } | |
903 | ||
904 | static void pmz_irda_reset(struct uart_pmac_port *uap) | |
905 | { | |
906 | uap->curregs[R5] |= DTR; | |
907 | write_zsreg(uap, R5, uap->curregs[R5]); | |
908 | zssync(uap); | |
909 | mdelay(110); | |
910 | uap->curregs[R5] &= ~DTR; | |
911 | write_zsreg(uap, R5, uap->curregs[R5]); | |
912 | zssync(uap); | |
913 | mdelay(10); | |
914 | } | |
915 | ||
916 | /* | |
917 | * This is the "normal" startup routine, using the above one | |
918 | * wrapped with the lock and doing a schedule delay | |
919 | */ | |
920 | static int pmz_startup(struct uart_port *port) | |
921 | { | |
922 | struct uart_pmac_port *uap = to_pmz(port); | |
923 | unsigned long flags; | |
924 | int pwr_delay = 0; | |
925 | ||
926 | pmz_debug("pmz: startup()\n"); | |
927 | ||
928 | if (ZS_IS_ASLEEP(uap)) | |
929 | return -EAGAIN; | |
930 | if (uap->node == NULL) | |
931 | return -ENODEV; | |
932 | ||
f392ecfa | 933 | mutex_lock(&pmz_irq_mutex); |
1da177e4 LT |
934 | |
935 | uap->flags |= PMACZILOG_FLAG_IS_OPEN; | |
936 | ||
937 | /* A console is never powered down. Else, power up and | |
938 | * initialize the chip | |
939 | */ | |
940 | if (!ZS_IS_CONS(uap)) { | |
941 | spin_lock_irqsave(&port->lock, flags); | |
942 | pwr_delay = __pmz_startup(uap); | |
943 | spin_unlock_irqrestore(&port->lock, flags); | |
944 | } | |
945 | ||
946 | pmz_get_port_A(uap)->flags |= PMACZILOG_FLAG_IS_IRQ_ON; | |
40663cc7 | 947 | if (request_irq(uap->port.irq, pmz_interrupt, IRQF_SHARED, "PowerMac Zilog", uap)) { |
1da177e4 LT |
948 | dev_err(&uap->dev->ofdev.dev, |
949 | "Unable to register zs interrupt handler.\n"); | |
950 | pmz_set_scc_power(uap, 0); | |
f392ecfa | 951 | mutex_unlock(&pmz_irq_mutex); |
1da177e4 LT |
952 | return -ENXIO; |
953 | } | |
954 | ||
f392ecfa | 955 | mutex_unlock(&pmz_irq_mutex); |
1da177e4 LT |
956 | |
957 | /* Right now, we deal with delay by blocking here, I'll be | |
958 | * smarter later on | |
959 | */ | |
960 | if (pwr_delay != 0) { | |
961 | pmz_debug("pmz: delaying %d ms\n", pwr_delay); | |
962 | msleep(pwr_delay); | |
963 | } | |
964 | ||
965 | /* IrDA reset is done now */ | |
966 | if (ZS_IS_IRDA(uap)) | |
967 | pmz_irda_reset(uap); | |
968 | ||
969 | /* Enable interrupts emission from the chip */ | |
970 | spin_lock_irqsave(&port->lock, flags); | |
971 | uap->curregs[R1] |= INT_ALL_Rx | TxINT_ENAB; | |
972 | if (!ZS_IS_EXTCLK(uap)) | |
973 | uap->curregs[R1] |= EXT_INT_ENAB; | |
974 | write_zsreg(uap, R1, uap->curregs[R1]); | |
975 | spin_unlock_irqrestore(&port->lock, flags); | |
976 | ||
977 | pmz_debug("pmz: startup() done.\n"); | |
978 | ||
979 | return 0; | |
980 | } | |
981 | ||
982 | static void pmz_shutdown(struct uart_port *port) | |
983 | { | |
984 | struct uart_pmac_port *uap = to_pmz(port); | |
985 | unsigned long flags; | |
986 | ||
987 | pmz_debug("pmz: shutdown()\n"); | |
988 | ||
989 | if (uap->node == NULL) | |
990 | return; | |
991 | ||
f392ecfa | 992 | mutex_lock(&pmz_irq_mutex); |
1da177e4 LT |
993 | |
994 | /* Release interrupt handler */ | |
995 | free_irq(uap->port.irq, uap); | |
996 | ||
997 | spin_lock_irqsave(&port->lock, flags); | |
998 | ||
999 | uap->flags &= ~PMACZILOG_FLAG_IS_OPEN; | |
1000 | ||
1001 | if (!ZS_IS_OPEN(uap->mate)) | |
1002 | pmz_get_port_A(uap)->flags &= ~PMACZILOG_FLAG_IS_IRQ_ON; | |
1003 | ||
1004 | /* Disable interrupts */ | |
1005 | if (!ZS_IS_ASLEEP(uap)) { | |
1006 | uap->curregs[R1] &= ~(EXT_INT_ENAB | TxINT_ENAB | RxINT_MASK); | |
1007 | write_zsreg(uap, R1, uap->curregs[R1]); | |
1008 | zssync(uap); | |
1009 | } | |
1010 | ||
1011 | if (ZS_IS_CONS(uap) || ZS_IS_ASLEEP(uap)) { | |
1012 | spin_unlock_irqrestore(&port->lock, flags); | |
f392ecfa | 1013 | mutex_unlock(&pmz_irq_mutex); |
1da177e4 LT |
1014 | return; |
1015 | } | |
1016 | ||
1017 | /* Disable receiver and transmitter. */ | |
1018 | uap->curregs[R3] &= ~RxENABLE; | |
1019 | uap->curregs[R5] &= ~TxENABLE; | |
1020 | ||
1021 | /* Disable all interrupts and BRK assertion. */ | |
1022 | uap->curregs[R5] &= ~SND_BRK; | |
1023 | pmz_maybe_update_regs(uap); | |
1024 | ||
1025 | /* Shut the chip down */ | |
1026 | pmz_set_scc_power(uap, 0); | |
1027 | ||
1028 | spin_unlock_irqrestore(&port->lock, flags); | |
1029 | ||
f392ecfa | 1030 | mutex_unlock(&pmz_irq_mutex); |
1da177e4 LT |
1031 | |
1032 | pmz_debug("pmz: shutdown() done.\n"); | |
1033 | } | |
1034 | ||
1035 | /* Shared by TTY driver and serial console setup. The port lock is held | |
1036 | * and local interrupts are disabled. | |
1037 | */ | |
1038 | static void pmz_convert_to_zs(struct uart_pmac_port *uap, unsigned int cflag, | |
1039 | unsigned int iflag, unsigned long baud) | |
1040 | { | |
1041 | int brg; | |
1042 | ||
1043 | ||
1044 | /* Switch to external clocking for IrDA high clock rates. That | |
1045 | * code could be re-used for Midi interfaces with different | |
1046 | * multipliers | |
1047 | */ | |
1048 | if (baud >= 115200 && ZS_IS_IRDA(uap)) { | |
1049 | uap->curregs[R4] = X1CLK; | |
1050 | uap->curregs[R11] = RCTRxCP | TCTRxCP; | |
1051 | uap->curregs[R14] = 0; /* BRG off */ | |
1052 | uap->curregs[R12] = 0; | |
1053 | uap->curregs[R13] = 0; | |
1054 | uap->flags |= PMACZILOG_FLAG_IS_EXTCLK; | |
1055 | } else { | |
1056 | switch (baud) { | |
1057 | case ZS_CLOCK/16: /* 230400 */ | |
1058 | uap->curregs[R4] = X16CLK; | |
1059 | uap->curregs[R11] = 0; | |
1060 | uap->curregs[R14] = 0; | |
1061 | break; | |
1062 | case ZS_CLOCK/32: /* 115200 */ | |
1063 | uap->curregs[R4] = X32CLK; | |
1064 | uap->curregs[R11] = 0; | |
1065 | uap->curregs[R14] = 0; | |
1066 | break; | |
1067 | default: | |
1068 | uap->curregs[R4] = X16CLK; | |
1069 | uap->curregs[R11] = TCBR | RCBR; | |
1070 | brg = BPS_TO_BRG(baud, ZS_CLOCK / 16); | |
1071 | uap->curregs[R12] = (brg & 255); | |
1072 | uap->curregs[R13] = ((brg >> 8) & 255); | |
1073 | uap->curregs[R14] = BRENAB; | |
1074 | } | |
1075 | uap->flags &= ~PMACZILOG_FLAG_IS_EXTCLK; | |
1076 | } | |
1077 | ||
1078 | /* Character size, stop bits, and parity. */ | |
1079 | uap->curregs[3] &= ~RxN_MASK; | |
1080 | uap->curregs[5] &= ~TxN_MASK; | |
1081 | ||
1082 | switch (cflag & CSIZE) { | |
1083 | case CS5: | |
1084 | uap->curregs[3] |= Rx5; | |
1085 | uap->curregs[5] |= Tx5; | |
1086 | uap->parity_mask = 0x1f; | |
1087 | break; | |
1088 | case CS6: | |
1089 | uap->curregs[3] |= Rx6; | |
1090 | uap->curregs[5] |= Tx6; | |
1091 | uap->parity_mask = 0x3f; | |
1092 | break; | |
1093 | case CS7: | |
1094 | uap->curregs[3] |= Rx7; | |
1095 | uap->curregs[5] |= Tx7; | |
1096 | uap->parity_mask = 0x7f; | |
1097 | break; | |
1098 | case CS8: | |
1099 | default: | |
1100 | uap->curregs[3] |= Rx8; | |
1101 | uap->curregs[5] |= Tx8; | |
1102 | uap->parity_mask = 0xff; | |
1103 | break; | |
1104 | }; | |
1105 | uap->curregs[4] &= ~(SB_MASK); | |
1106 | if (cflag & CSTOPB) | |
1107 | uap->curregs[4] |= SB2; | |
1108 | else | |
1109 | uap->curregs[4] |= SB1; | |
1110 | if (cflag & PARENB) | |
1111 | uap->curregs[4] |= PAR_ENAB; | |
1112 | else | |
1113 | uap->curregs[4] &= ~PAR_ENAB; | |
1114 | if (!(cflag & PARODD)) | |
1115 | uap->curregs[4] |= PAR_EVEN; | |
1116 | else | |
1117 | uap->curregs[4] &= ~PAR_EVEN; | |
1118 | ||
1119 | uap->port.read_status_mask = Rx_OVR; | |
1120 | if (iflag & INPCK) | |
1121 | uap->port.read_status_mask |= CRC_ERR | PAR_ERR; | |
1122 | if (iflag & (BRKINT | PARMRK)) | |
1123 | uap->port.read_status_mask |= BRK_ABRT; | |
1124 | ||
1125 | uap->port.ignore_status_mask = 0; | |
1126 | if (iflag & IGNPAR) | |
1127 | uap->port.ignore_status_mask |= CRC_ERR | PAR_ERR; | |
1128 | if (iflag & IGNBRK) { | |
1129 | uap->port.ignore_status_mask |= BRK_ABRT; | |
1130 | if (iflag & IGNPAR) | |
1131 | uap->port.ignore_status_mask |= Rx_OVR; | |
1132 | } | |
1133 | ||
1134 | if ((cflag & CREAD) == 0) | |
1135 | uap->port.ignore_status_mask = 0xff; | |
1136 | } | |
1137 | ||
1138 | ||
1139 | /* | |
1140 | * Set the irda codec on the imac to the specified baud rate. | |
1141 | */ | |
1142 | static void pmz_irda_setup(struct uart_pmac_port *uap, unsigned long *baud) | |
1143 | { | |
1144 | u8 cmdbyte; | |
1145 | int t, version; | |
1146 | ||
1147 | switch (*baud) { | |
1148 | /* SIR modes */ | |
1149 | case 2400: | |
1150 | cmdbyte = 0x53; | |
1151 | break; | |
1152 | case 4800: | |
1153 | cmdbyte = 0x52; | |
1154 | break; | |
1155 | case 9600: | |
1156 | cmdbyte = 0x51; | |
1157 | break; | |
1158 | case 19200: | |
1159 | cmdbyte = 0x50; | |
1160 | break; | |
1161 | case 38400: | |
1162 | cmdbyte = 0x4f; | |
1163 | break; | |
1164 | case 57600: | |
1165 | cmdbyte = 0x4e; | |
1166 | break; | |
1167 | case 115200: | |
1168 | cmdbyte = 0x4d; | |
1169 | break; | |
1170 | /* The FIR modes aren't really supported at this point, how | |
1171 | * do we select the speed ? via the FCR on KeyLargo ? | |
1172 | */ | |
1173 | case 1152000: | |
1174 | cmdbyte = 0; | |
1175 | break; | |
1176 | case 4000000: | |
1177 | cmdbyte = 0; | |
1178 | break; | |
1179 | default: /* 9600 */ | |
1180 | cmdbyte = 0x51; | |
1181 | *baud = 9600; | |
1182 | break; | |
1183 | } | |
1184 | ||
1185 | /* Wait for transmitter to drain */ | |
1186 | t = 10000; | |
1187 | while ((read_zsreg(uap, R0) & Tx_BUF_EMP) == 0 | |
1188 | || (read_zsreg(uap, R1) & ALL_SNT) == 0) { | |
1189 | if (--t <= 0) { | |
1190 | dev_err(&uap->dev->ofdev.dev, "transmitter didn't drain\n"); | |
1191 | return; | |
1192 | } | |
1193 | udelay(10); | |
1194 | } | |
1195 | ||
1196 | /* Drain the receiver too */ | |
1197 | t = 100; | |
1198 | (void)read_zsdata(uap); | |
1199 | (void)read_zsdata(uap); | |
1200 | (void)read_zsdata(uap); | |
1201 | mdelay(10); | |
1202 | while (read_zsreg(uap, R0) & Rx_CH_AV) { | |
1203 | read_zsdata(uap); | |
1204 | mdelay(10); | |
1205 | if (--t <= 0) { | |
1206 | dev_err(&uap->dev->ofdev.dev, "receiver didn't drain\n"); | |
1207 | return; | |
1208 | } | |
1209 | } | |
1210 | ||
1211 | /* Switch to command mode */ | |
1212 | uap->curregs[R5] |= DTR; | |
1213 | write_zsreg(uap, R5, uap->curregs[R5]); | |
1214 | zssync(uap); | |
1215 | mdelay(1); | |
1216 | ||
1217 | /* Switch SCC to 19200 */ | |
1218 | pmz_convert_to_zs(uap, CS8, 0, 19200); | |
1219 | pmz_load_zsregs(uap, uap->curregs); | |
1220 | mdelay(1); | |
1221 | ||
1222 | /* Write get_version command byte */ | |
1223 | write_zsdata(uap, 1); | |
1224 | t = 5000; | |
1225 | while ((read_zsreg(uap, R0) & Rx_CH_AV) == 0) { | |
1226 | if (--t <= 0) { | |
1227 | dev_err(&uap->dev->ofdev.dev, | |
1228 | "irda_setup timed out on get_version byte\n"); | |
1229 | goto out; | |
1230 | } | |
1231 | udelay(10); | |
1232 | } | |
1233 | version = read_zsdata(uap); | |
1234 | ||
1235 | if (version < 4) { | |
1236 | dev_info(&uap->dev->ofdev.dev, "IrDA: dongle version %d not supported\n", | |
1237 | version); | |
1238 | goto out; | |
1239 | } | |
1240 | ||
1241 | /* Send speed mode */ | |
1242 | write_zsdata(uap, cmdbyte); | |
1243 | t = 5000; | |
1244 | while ((read_zsreg(uap, R0) & Rx_CH_AV) == 0) { | |
1245 | if (--t <= 0) { | |
1246 | dev_err(&uap->dev->ofdev.dev, | |
1247 | "irda_setup timed out on speed mode byte\n"); | |
1248 | goto out; | |
1249 | } | |
1250 | udelay(10); | |
1251 | } | |
1252 | t = read_zsdata(uap); | |
1253 | if (t != cmdbyte) | |
1254 | dev_err(&uap->dev->ofdev.dev, | |
1255 | "irda_setup speed mode byte = %x (%x)\n", t, cmdbyte); | |
1256 | ||
1257 | dev_info(&uap->dev->ofdev.dev, "IrDA setup for %ld bps, dongle version: %d\n", | |
1258 | *baud, version); | |
1259 | ||
1260 | (void)read_zsdata(uap); | |
1261 | (void)read_zsdata(uap); | |
1262 | (void)read_zsdata(uap); | |
1263 | ||
1264 | out: | |
1265 | /* Switch back to data mode */ | |
1266 | uap->curregs[R5] &= ~DTR; | |
1267 | write_zsreg(uap, R5, uap->curregs[R5]); | |
1268 | zssync(uap); | |
1269 | ||
1270 | (void)read_zsdata(uap); | |
1271 | (void)read_zsdata(uap); | |
1272 | (void)read_zsdata(uap); | |
1273 | } | |
1274 | ||
1275 | ||
606d099c AC |
1276 | static void __pmz_set_termios(struct uart_port *port, struct ktermios *termios, |
1277 | struct ktermios *old) | |
1da177e4 LT |
1278 | { |
1279 | struct uart_pmac_port *uap = to_pmz(port); | |
1280 | unsigned long baud; | |
1281 | ||
1282 | pmz_debug("pmz: set_termios()\n"); | |
1283 | ||
1284 | if (ZS_IS_ASLEEP(uap)) | |
1285 | return; | |
1286 | ||
606d099c | 1287 | memcpy(&uap->termios_cache, termios, sizeof(struct ktermios)); |
1da177e4 LT |
1288 | |
1289 | /* XXX Check which revs of machines actually allow 1 and 4Mb speeds | |
1290 | * on the IR dongle. Note that the IRTTY driver currently doesn't know | |
1291 | * about the FIR mode and high speed modes. So these are unused. For | |
1292 | * implementing proper support for these, we should probably add some | |
1293 | * DMA as well, at least on the Rx side, which isn't a simple thing | |
1294 | * at this point. | |
1295 | */ | |
1296 | if (ZS_IS_IRDA(uap)) { | |
1297 | /* Calc baud rate */ | |
1298 | baud = uart_get_baud_rate(port, termios, old, 1200, 4000000); | |
1299 | pmz_debug("pmz: switch IRDA to %ld bauds\n", baud); | |
1300 | /* Cet the irda codec to the right rate */ | |
1301 | pmz_irda_setup(uap, &baud); | |
1302 | /* Set final baud rate */ | |
1303 | pmz_convert_to_zs(uap, termios->c_cflag, termios->c_iflag, baud); | |
1304 | pmz_load_zsregs(uap, uap->curregs); | |
1305 | zssync(uap); | |
1306 | } else { | |
1307 | baud = uart_get_baud_rate(port, termios, old, 1200, 230400); | |
1308 | pmz_convert_to_zs(uap, termios->c_cflag, termios->c_iflag, baud); | |
1309 | /* Make sure modem status interrupts are correctly configured */ | |
1310 | if (UART_ENABLE_MS(&uap->port, termios->c_cflag)) { | |
1311 | uap->curregs[R15] |= DCDIE | SYNCIE | CTSIE; | |
1312 | uap->flags |= PMACZILOG_FLAG_MODEM_STATUS; | |
1313 | } else { | |
1314 | uap->curregs[R15] &= ~(DCDIE | SYNCIE | CTSIE); | |
1315 | uap->flags &= ~PMACZILOG_FLAG_MODEM_STATUS; | |
1316 | } | |
1317 | ||
1318 | /* Load registers to the chip */ | |
1319 | pmz_maybe_update_regs(uap); | |
1320 | } | |
1321 | uart_update_timeout(port, termios->c_cflag, baud); | |
1322 | ||
1323 | pmz_debug("pmz: set_termios() done.\n"); | |
1324 | } | |
1325 | ||
1326 | /* The port lock is not held. */ | |
606d099c AC |
1327 | static void pmz_set_termios(struct uart_port *port, struct ktermios *termios, |
1328 | struct ktermios *old) | |
1da177e4 LT |
1329 | { |
1330 | struct uart_pmac_port *uap = to_pmz(port); | |
1331 | unsigned long flags; | |
1332 | ||
1333 | spin_lock_irqsave(&port->lock, flags); | |
1334 | ||
1335 | /* Disable IRQs on the port */ | |
1336 | uap->curregs[R1] &= ~(EXT_INT_ENAB | TxINT_ENAB | RxINT_MASK); | |
1337 | write_zsreg(uap, R1, uap->curregs[R1]); | |
1338 | ||
1339 | /* Setup new port configuration */ | |
1340 | __pmz_set_termios(port, termios, old); | |
1341 | ||
1342 | /* Re-enable IRQs on the port */ | |
1343 | if (ZS_IS_OPEN(uap)) { | |
1344 | uap->curregs[R1] |= INT_ALL_Rx | TxINT_ENAB; | |
1345 | if (!ZS_IS_EXTCLK(uap)) | |
1346 | uap->curregs[R1] |= EXT_INT_ENAB; | |
1347 | write_zsreg(uap, R1, uap->curregs[R1]); | |
1348 | } | |
1349 | spin_unlock_irqrestore(&port->lock, flags); | |
1350 | } | |
1351 | ||
1352 | static const char *pmz_type(struct uart_port *port) | |
1353 | { | |
1354 | struct uart_pmac_port *uap = to_pmz(port); | |
1355 | ||
1356 | if (ZS_IS_IRDA(uap)) | |
1357 | return "Z85c30 ESCC - Infrared port"; | |
1358 | else if (ZS_IS_INTMODEM(uap)) | |
1359 | return "Z85c30 ESCC - Internal modem"; | |
1360 | return "Z85c30 ESCC - Serial port"; | |
1361 | } | |
1362 | ||
1363 | /* We do not request/release mappings of the registers here, this | |
1364 | * happens at early serial probe time. | |
1365 | */ | |
1366 | static void pmz_release_port(struct uart_port *port) | |
1367 | { | |
1368 | } | |
1369 | ||
1370 | static int pmz_request_port(struct uart_port *port) | |
1371 | { | |
1372 | return 0; | |
1373 | } | |
1374 | ||
1375 | /* These do not need to do anything interesting either. */ | |
1376 | static void pmz_config_port(struct uart_port *port, int flags) | |
1377 | { | |
1378 | } | |
1379 | ||
1380 | /* We do not support letting the user mess with the divisor, IRQ, etc. */ | |
1381 | static int pmz_verify_port(struct uart_port *port, struct serial_struct *ser) | |
1382 | { | |
1383 | return -EINVAL; | |
1384 | } | |
1385 | ||
8c653186 CA |
1386 | #ifdef CONFIG_CONSOLE_POLL |
1387 | ||
1388 | static int pmz_poll_get_char(struct uart_port *port) | |
1389 | { | |
1390 | struct uart_pmac_port *uap = (struct uart_pmac_port *)port; | |
1391 | ||
1392 | while ((read_zsreg(uap, R0) & Rx_CH_AV) == 0) | |
1393 | udelay(5); | |
1394 | return read_zsdata(uap); | |
1395 | } | |
1396 | ||
1397 | static void pmz_poll_put_char(struct uart_port *port, unsigned char c) | |
1398 | { | |
1399 | struct uart_pmac_port *uap = (struct uart_pmac_port *)port; | |
1400 | ||
1401 | /* Wait for the transmit buffer to empty. */ | |
1402 | while ((read_zsreg(uap, R0) & Tx_BUF_EMP) == 0) | |
1403 | udelay(5); | |
1404 | write_zsdata(uap, c); | |
1405 | } | |
1406 | ||
1407 | #endif | |
1408 | ||
1da177e4 LT |
1409 | static struct uart_ops pmz_pops = { |
1410 | .tx_empty = pmz_tx_empty, | |
1411 | .set_mctrl = pmz_set_mctrl, | |
1412 | .get_mctrl = pmz_get_mctrl, | |
1413 | .stop_tx = pmz_stop_tx, | |
1414 | .start_tx = pmz_start_tx, | |
1415 | .stop_rx = pmz_stop_rx, | |
1416 | .enable_ms = pmz_enable_ms, | |
1417 | .break_ctl = pmz_break_ctl, | |
1418 | .startup = pmz_startup, | |
1419 | .shutdown = pmz_shutdown, | |
1420 | .set_termios = pmz_set_termios, | |
1421 | .type = pmz_type, | |
1422 | .release_port = pmz_release_port, | |
1423 | .request_port = pmz_request_port, | |
1424 | .config_port = pmz_config_port, | |
1425 | .verify_port = pmz_verify_port, | |
8c653186 CA |
1426 | #ifdef CONFIG_CONSOLE_POLL |
1427 | .poll_get_char = pmz_poll_get_char, | |
1428 | .poll_put_char = pmz_poll_put_char, | |
1429 | #endif | |
1da177e4 LT |
1430 | }; |
1431 | ||
1432 | /* | |
1433 | * Setup one port structure after probing, HW is down at this point, | |
1434 | * Unlike sunzilog, we don't need to pre-init the spinlock as we don't | |
1435 | * register our console before uart_add_one_port() is called | |
1436 | */ | |
1437 | static int __init pmz_init_port(struct uart_pmac_port *uap) | |
1438 | { | |
1439 | struct device_node *np = uap->node; | |
018a3d1d JK |
1440 | const char *conn; |
1441 | const struct slot_names_prop { | |
1da177e4 LT |
1442 | int count; |
1443 | char name[1]; | |
1444 | } *slots; | |
1445 | int len; | |
cc5d0189 | 1446 | struct resource r_ports, r_rxdma, r_txdma; |
1da177e4 LT |
1447 | |
1448 | /* | |
1449 | * Request & map chip registers | |
1450 | */ | |
cc5d0189 BH |
1451 | if (of_address_to_resource(np, 0, &r_ports)) |
1452 | return -ENODEV; | |
1453 | uap->port.mapbase = r_ports.start; | |
1da177e4 LT |
1454 | uap->port.membase = ioremap(uap->port.mapbase, 0x1000); |
1455 | ||
1456 | uap->control_reg = uap->port.membase; | |
1457 | uap->data_reg = uap->control_reg + 0x10; | |
1458 | ||
1459 | /* | |
1460 | * Request & map DBDMA registers | |
1461 | */ | |
1462 | #ifdef HAS_DBDMA | |
cc5d0189 BH |
1463 | if (of_address_to_resource(np, 1, &r_txdma) == 0 && |
1464 | of_address_to_resource(np, 2, &r_rxdma) == 0) | |
1da177e4 | 1465 | uap->flags |= PMACZILOG_FLAG_HAS_DMA; |
cc5d0189 BH |
1466 | #else |
1467 | memset(&r_txdma, 0, sizeof(struct resource)); | |
1468 | memset(&r_rxdma, 0, sizeof(struct resource)); | |
1da177e4 LT |
1469 | #endif |
1470 | if (ZS_HAS_DMA(uap)) { | |
cc5d0189 | 1471 | uap->tx_dma_regs = ioremap(r_txdma.start, 0x100); |
1da177e4 LT |
1472 | if (uap->tx_dma_regs == NULL) { |
1473 | uap->flags &= ~PMACZILOG_FLAG_HAS_DMA; | |
1474 | goto no_dma; | |
1475 | } | |
cc5d0189 | 1476 | uap->rx_dma_regs = ioremap(r_rxdma.start, 0x100); |
1da177e4 LT |
1477 | if (uap->rx_dma_regs == NULL) { |
1478 | iounmap(uap->tx_dma_regs); | |
1479 | uap->tx_dma_regs = NULL; | |
1480 | uap->flags &= ~PMACZILOG_FLAG_HAS_DMA; | |
1481 | goto no_dma; | |
1482 | } | |
0ebfff14 BH |
1483 | uap->tx_dma_irq = irq_of_parse_and_map(np, 1); |
1484 | uap->rx_dma_irq = irq_of_parse_and_map(np, 2); | |
1da177e4 LT |
1485 | } |
1486 | no_dma: | |
1487 | ||
1488 | /* | |
1489 | * Detect port type | |
1490 | */ | |
55b61fec | 1491 | if (of_device_is_compatible(np, "cobalt")) |
1da177e4 | 1492 | uap->flags |= PMACZILOG_FLAG_IS_INTMODEM; |
40cd3a45 | 1493 | conn = of_get_property(np, "AAPL,connector", &len); |
1da177e4 LT |
1494 | if (conn && (strcmp(conn, "infrared") == 0)) |
1495 | uap->flags |= PMACZILOG_FLAG_IS_IRDA; | |
1496 | uap->port_type = PMAC_SCC_ASYNC; | |
1497 | /* 1999 Powerbook G3 has slot-names property instead */ | |
40cd3a45 | 1498 | slots = of_get_property(np, "slot-names", &len); |
1da177e4 LT |
1499 | if (slots && slots->count > 0) { |
1500 | if (strcmp(slots->name, "IrDA") == 0) | |
1501 | uap->flags |= PMACZILOG_FLAG_IS_IRDA; | |
1502 | else if (strcmp(slots->name, "Modem") == 0) | |
1503 | uap->flags |= PMACZILOG_FLAG_IS_INTMODEM; | |
1504 | } | |
1505 | if (ZS_IS_IRDA(uap)) | |
1506 | uap->port_type = PMAC_SCC_IRDA; | |
1507 | if (ZS_IS_INTMODEM(uap)) { | |
30686ba6 SR |
1508 | struct device_node* i2c_modem = |
1509 | of_find_node_by_name(NULL, "i2c-modem"); | |
1da177e4 | 1510 | if (i2c_modem) { |
018a3d1d | 1511 | const char* mid = |
40cd3a45 | 1512 | of_get_property(i2c_modem, "modem-id", NULL); |
1da177e4 LT |
1513 | if (mid) switch(*mid) { |
1514 | case 0x04 : | |
1515 | case 0x05 : | |
1516 | case 0x07 : | |
1517 | case 0x08 : | |
1518 | case 0x0b : | |
1519 | case 0x0c : | |
1520 | uap->port_type = PMAC_SCC_I2S1; | |
1521 | } | |
1522 | printk(KERN_INFO "pmac_zilog: i2c-modem detected, id: %d\n", | |
1523 | mid ? (*mid) : 0); | |
30686ba6 | 1524 | of_node_put(i2c_modem); |
1da177e4 LT |
1525 | } else { |
1526 | printk(KERN_INFO "pmac_zilog: serial modem detected\n"); | |
1527 | } | |
1528 | } | |
1529 | ||
1530 | /* | |
1531 | * Init remaining bits of "port" structure | |
1532 | */ | |
9b4a1617 | 1533 | uap->port.iotype = UPIO_MEM; |
0ebfff14 | 1534 | uap->port.irq = irq_of_parse_and_map(np, 0); |
1da177e4 LT |
1535 | uap->port.uartclk = ZS_CLOCK; |
1536 | uap->port.fifosize = 1; | |
1537 | uap->port.ops = &pmz_pops; | |
1538 | uap->port.type = PORT_PMAC_ZILOG; | |
1539 | uap->port.flags = 0; | |
1540 | ||
1541 | /* Setup some valid baud rate information in the register | |
1542 | * shadows so we don't write crap there before baud rate is | |
1543 | * first initialized. | |
1544 | */ | |
1545 | pmz_convert_to_zs(uap, CS8, 0, 9600); | |
1546 | ||
1547 | return 0; | |
1548 | } | |
1549 | ||
1550 | /* | |
1551 | * Get rid of a port on module removal | |
1552 | */ | |
1553 | static void pmz_dispose_port(struct uart_pmac_port *uap) | |
1554 | { | |
1555 | struct device_node *np; | |
1556 | ||
1557 | np = uap->node; | |
1558 | iounmap(uap->rx_dma_regs); | |
1559 | iounmap(uap->tx_dma_regs); | |
1560 | iounmap(uap->control_reg); | |
1561 | uap->node = NULL; | |
1562 | of_node_put(np); | |
1563 | memset(uap, 0, sizeof(struct uart_pmac_port)); | |
1564 | } | |
1565 | ||
1566 | /* | |
1567 | * Called upon match with an escc node in the devive-tree. | |
1568 | */ | |
5e655772 | 1569 | static int pmz_attach(struct macio_dev *mdev, const struct of_device_id *match) |
1da177e4 LT |
1570 | { |
1571 | int i; | |
1572 | ||
1573 | /* Iterate the pmz_ports array to find a matching entry | |
1574 | */ | |
1575 | for (i = 0; i < MAX_ZS_PORTS; i++) | |
1576 | if (pmz_ports[i].node == mdev->ofdev.node) { | |
1577 | struct uart_pmac_port *uap = &pmz_ports[i]; | |
1578 | ||
1579 | uap->dev = mdev; | |
1580 | dev_set_drvdata(&mdev->ofdev.dev, uap); | |
1581 | if (macio_request_resources(uap->dev, "pmac_zilog")) | |
1582 | printk(KERN_WARNING "%s: Failed to request resource" | |
1583 | ", port still active\n", | |
1584 | uap->node->name); | |
1585 | else | |
1586 | uap->flags |= PMACZILOG_FLAG_RSRC_REQUESTED; | |
1587 | return 0; | |
1588 | } | |
1589 | return -ENODEV; | |
1590 | } | |
1591 | ||
1592 | /* | |
1593 | * That one should not be called, macio isn't really a hotswap device, | |
1594 | * we don't expect one of those serial ports to go away... | |
1595 | */ | |
1596 | static int pmz_detach(struct macio_dev *mdev) | |
1597 | { | |
1598 | struct uart_pmac_port *uap = dev_get_drvdata(&mdev->ofdev.dev); | |
1599 | ||
1600 | if (!uap) | |
1601 | return -ENODEV; | |
1602 | ||
1603 | if (uap->flags & PMACZILOG_FLAG_RSRC_REQUESTED) { | |
1604 | macio_release_resources(uap->dev); | |
1605 | uap->flags &= ~PMACZILOG_FLAG_RSRC_REQUESTED; | |
1606 | } | |
1607 | dev_set_drvdata(&mdev->ofdev.dev, NULL); | |
1608 | uap->dev = NULL; | |
1609 | ||
1610 | return 0; | |
1611 | } | |
1612 | ||
1613 | ||
0370affe | 1614 | static int pmz_suspend(struct macio_dev *mdev, pm_message_t pm_state) |
1da177e4 LT |
1615 | { |
1616 | struct uart_pmac_port *uap = dev_get_drvdata(&mdev->ofdev.dev); | |
1617 | struct uart_state *state; | |
1618 | unsigned long flags; | |
1619 | ||
1620 | if (uap == NULL) { | |
1621 | printk("HRM... pmz_suspend with NULL uap\n"); | |
1622 | return 0; | |
1623 | } | |
1624 | ||
ca078bae | 1625 | if (pm_state.event == mdev->ofdev.dev.power.power_state.event) |
1da177e4 LT |
1626 | return 0; |
1627 | ||
aa015429 | 1628 | pmz_debug("suspend, switching to state %d\n", pm_state.event); |
1da177e4 LT |
1629 | |
1630 | state = pmz_uart_reg.state + uap->port.line; | |
1631 | ||
f392ecfa | 1632 | mutex_lock(&pmz_irq_mutex); |
e2862f6a | 1633 | mutex_lock(&state->mutex); |
1da177e4 LT |
1634 | |
1635 | spin_lock_irqsave(&uap->port.lock, flags); | |
1636 | ||
1637 | if (ZS_IS_OPEN(uap) || ZS_IS_CONS(uap)) { | |
1638 | /* Disable receiver and transmitter. */ | |
1639 | uap->curregs[R3] &= ~RxENABLE; | |
1640 | uap->curregs[R5] &= ~TxENABLE; | |
1641 | ||
1642 | /* Disable all interrupts and BRK assertion. */ | |
1643 | uap->curregs[R1] &= ~(EXT_INT_ENAB | TxINT_ENAB | RxINT_MASK); | |
1644 | uap->curregs[R5] &= ~SND_BRK; | |
1645 | pmz_load_zsregs(uap, uap->curregs); | |
1646 | uap->flags |= PMACZILOG_FLAG_IS_ASLEEP; | |
1647 | mb(); | |
1648 | } | |
1649 | ||
1650 | spin_unlock_irqrestore(&uap->port.lock, flags); | |
1651 | ||
1652 | if (ZS_IS_OPEN(uap) || ZS_IS_OPEN(uap->mate)) | |
1653 | if (ZS_IS_ASLEEP(uap->mate) && ZS_IS_IRQ_ON(pmz_get_port_A(uap))) { | |
1654 | pmz_get_port_A(uap)->flags &= ~PMACZILOG_FLAG_IS_IRQ_ON; | |
1655 | disable_irq(uap->port.irq); | |
1656 | } | |
1657 | ||
1658 | if (ZS_IS_CONS(uap)) | |
1659 | uap->port.cons->flags &= ~CON_ENABLED; | |
1660 | ||
1661 | /* Shut the chip down */ | |
1662 | pmz_set_scc_power(uap, 0); | |
1663 | ||
e2862f6a | 1664 | mutex_unlock(&state->mutex); |
f392ecfa | 1665 | mutex_unlock(&pmz_irq_mutex); |
1da177e4 LT |
1666 | |
1667 | pmz_debug("suspend, switching complete\n"); | |
1668 | ||
1669 | mdev->ofdev.dev.power.power_state = pm_state; | |
1670 | ||
1671 | return 0; | |
1672 | } | |
1673 | ||
1674 | ||
1675 | static int pmz_resume(struct macio_dev *mdev) | |
1676 | { | |
1677 | struct uart_pmac_port *uap = dev_get_drvdata(&mdev->ofdev.dev); | |
1678 | struct uart_state *state; | |
1679 | unsigned long flags; | |
1680 | int pwr_delay = 0; | |
1681 | ||
1682 | if (uap == NULL) | |
1683 | return 0; | |
1684 | ||
ca078bae | 1685 | if (mdev->ofdev.dev.power.power_state.event == PM_EVENT_ON) |
1da177e4 LT |
1686 | return 0; |
1687 | ||
1688 | pmz_debug("resume, switching to state 0\n"); | |
1689 | ||
1690 | state = pmz_uart_reg.state + uap->port.line; | |
1691 | ||
f392ecfa | 1692 | mutex_lock(&pmz_irq_mutex); |
e2862f6a | 1693 | mutex_lock(&state->mutex); |
1da177e4 LT |
1694 | |
1695 | spin_lock_irqsave(&uap->port.lock, flags); | |
1696 | if (!ZS_IS_OPEN(uap) && !ZS_IS_CONS(uap)) { | |
1697 | spin_unlock_irqrestore(&uap->port.lock, flags); | |
1698 | goto bail; | |
1699 | } | |
1700 | pwr_delay = __pmz_startup(uap); | |
1701 | ||
1702 | /* Take care of config that may have changed while asleep */ | |
1703 | __pmz_set_termios(&uap->port, &uap->termios_cache, NULL); | |
1704 | ||
1705 | if (ZS_IS_OPEN(uap)) { | |
1706 | /* Enable interrupts */ | |
1707 | uap->curregs[R1] |= INT_ALL_Rx | TxINT_ENAB; | |
1708 | if (!ZS_IS_EXTCLK(uap)) | |
1709 | uap->curregs[R1] |= EXT_INT_ENAB; | |
1710 | write_zsreg(uap, R1, uap->curregs[R1]); | |
1711 | } | |
1712 | ||
1713 | spin_unlock_irqrestore(&uap->port.lock, flags); | |
1714 | ||
1715 | if (ZS_IS_CONS(uap)) | |
1716 | uap->port.cons->flags |= CON_ENABLED; | |
1717 | ||
1718 | /* Re-enable IRQ on the controller */ | |
1719 | if (ZS_IS_OPEN(uap) && !ZS_IS_IRQ_ON(pmz_get_port_A(uap))) { | |
1720 | pmz_get_port_A(uap)->flags |= PMACZILOG_FLAG_IS_IRQ_ON; | |
1721 | enable_irq(uap->port.irq); | |
1722 | } | |
1723 | ||
1724 | bail: | |
e2862f6a | 1725 | mutex_unlock(&state->mutex); |
f392ecfa | 1726 | mutex_unlock(&pmz_irq_mutex); |
1da177e4 LT |
1727 | |
1728 | /* Right now, we deal with delay by blocking here, I'll be | |
1729 | * smarter later on | |
1730 | */ | |
1731 | if (pwr_delay != 0) { | |
1732 | pmz_debug("pmz: delaying %d ms\n", pwr_delay); | |
1733 | msleep(pwr_delay); | |
1734 | } | |
1735 | ||
1736 | pmz_debug("resume, switching complete\n"); | |
1737 | ||
ca078bae | 1738 | mdev->ofdev.dev.power.power_state.event = PM_EVENT_ON; |
1da177e4 LT |
1739 | |
1740 | return 0; | |
1741 | } | |
1742 | ||
1743 | /* | |
1744 | * Probe all ports in the system and build the ports array, we register | |
1745 | * with the serial layer at this point, the macio-type probing is only | |
1746 | * used later to "attach" to the sysfs tree so we get power management | |
1747 | * events | |
1748 | */ | |
1749 | static int __init pmz_probe(void) | |
1750 | { | |
1751 | struct device_node *node_p, *node_a, *node_b, *np; | |
1752 | int count = 0; | |
1753 | int rc; | |
1754 | ||
1755 | /* | |
1756 | * Find all escc chips in the system | |
1757 | */ | |
1758 | node_p = of_find_node_by_name(NULL, "escc"); | |
1759 | while (node_p) { | |
1760 | /* | |
1761 | * First get channel A/B node pointers | |
1762 | * | |
1763 | * TODO: Add routines with proper locking to do that... | |
1764 | */ | |
1765 | node_a = node_b = NULL; | |
1766 | for (np = NULL; (np = of_get_next_child(node_p, np)) != NULL;) { | |
1767 | if (strncmp(np->name, "ch-a", 4) == 0) | |
1768 | node_a = of_node_get(np); | |
1769 | else if (strncmp(np->name, "ch-b", 4) == 0) | |
1770 | node_b = of_node_get(np); | |
1771 | } | |
1772 | if (!node_a && !node_b) { | |
1773 | of_node_put(node_a); | |
1774 | of_node_put(node_b); | |
1775 | printk(KERN_ERR "pmac_zilog: missing node %c for escc %s\n", | |
1776 | (!node_a) ? 'a' : 'b', node_p->full_name); | |
1777 | goto next; | |
1778 | } | |
1779 | ||
1780 | /* | |
1781 | * Fill basic fields in the port structures | |
1782 | */ | |
1783 | pmz_ports[count].mate = &pmz_ports[count+1]; | |
1784 | pmz_ports[count+1].mate = &pmz_ports[count]; | |
1785 | pmz_ports[count].flags = PMACZILOG_FLAG_IS_CHANNEL_A; | |
1786 | pmz_ports[count].node = node_a; | |
1787 | pmz_ports[count+1].node = node_b; | |
1788 | pmz_ports[count].port.line = count; | |
1789 | pmz_ports[count+1].port.line = count+1; | |
1790 | ||
1791 | /* | |
1792 | * Setup the ports for real | |
1793 | */ | |
1794 | rc = pmz_init_port(&pmz_ports[count]); | |
1795 | if (rc == 0 && node_b != NULL) | |
1796 | rc = pmz_init_port(&pmz_ports[count+1]); | |
1797 | if (rc != 0) { | |
1798 | of_node_put(node_a); | |
1799 | of_node_put(node_b); | |
1800 | memset(&pmz_ports[count], 0, sizeof(struct uart_pmac_port)); | |
1801 | memset(&pmz_ports[count+1], 0, sizeof(struct uart_pmac_port)); | |
1802 | goto next; | |
1803 | } | |
1804 | count += 2; | |
1805 | next: | |
1806 | node_p = of_find_node_by_name(node_p, "escc"); | |
1807 | } | |
1808 | pmz_ports_count = count; | |
1809 | ||
1810 | return 0; | |
1811 | } | |
1812 | ||
1813 | #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE | |
1814 | ||
1815 | static void pmz_console_write(struct console *con, const char *s, unsigned int count); | |
1816 | static int __init pmz_console_setup(struct console *co, char *options); | |
1817 | ||
1818 | static struct console pmz_console = { | |
e4533b24 | 1819 | .name = PMACZILOG_NAME, |
1da177e4 LT |
1820 | .write = pmz_console_write, |
1821 | .device = uart_console_device, | |
1822 | .setup = pmz_console_setup, | |
1823 | .flags = CON_PRINTBUFFER, | |
1824 | .index = -1, | |
1825 | .data = &pmz_uart_reg, | |
1826 | }; | |
1827 | ||
1828 | #define PMACZILOG_CONSOLE &pmz_console | |
1829 | #else /* CONFIG_SERIAL_PMACZILOG_CONSOLE */ | |
1830 | #define PMACZILOG_CONSOLE (NULL) | |
1831 | #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */ | |
1832 | ||
1833 | /* | |
1834 | * Register the driver, console driver and ports with the serial | |
1835 | * core | |
1836 | */ | |
1837 | static int __init pmz_register(void) | |
1838 | { | |
1839 | int i, rc; | |
1840 | ||
1841 | pmz_uart_reg.nr = pmz_ports_count; | |
1842 | pmz_uart_reg.cons = PMACZILOG_CONSOLE; | |
1da177e4 LT |
1843 | |
1844 | /* | |
1845 | * Register this driver with the serial core | |
1846 | */ | |
1847 | rc = uart_register_driver(&pmz_uart_reg); | |
1848 | if (rc) | |
1849 | return rc; | |
1850 | ||
1851 | /* | |
1852 | * Register each port with the serial core | |
1853 | */ | |
1854 | for (i = 0; i < pmz_ports_count; i++) { | |
1855 | struct uart_pmac_port *uport = &pmz_ports[i]; | |
1856 | /* NULL node may happen on wallstreet */ | |
1857 | if (uport->node != NULL) | |
1858 | rc = uart_add_one_port(&pmz_uart_reg, &uport->port); | |
1859 | if (rc) | |
1860 | goto err_out; | |
1861 | } | |
1862 | ||
1863 | return 0; | |
1864 | err_out: | |
1865 | while (i-- > 0) { | |
1866 | struct uart_pmac_port *uport = &pmz_ports[i]; | |
1867 | uart_remove_one_port(&pmz_uart_reg, &uport->port); | |
1868 | } | |
1869 | uart_unregister_driver(&pmz_uart_reg); | |
1870 | return rc; | |
1871 | } | |
1872 | ||
5e655772 | 1873 | static struct of_device_id pmz_match[] = |
1da177e4 LT |
1874 | { |
1875 | { | |
1876 | .name = "ch-a", | |
1da177e4 LT |
1877 | }, |
1878 | { | |
1879 | .name = "ch-b", | |
1da177e4 LT |
1880 | }, |
1881 | {}, | |
1882 | }; | |
5e655772 | 1883 | MODULE_DEVICE_TABLE (of, pmz_match); |
1da177e4 LT |
1884 | |
1885 | static struct macio_driver pmz_driver = | |
1886 | { | |
1887 | .name = "pmac_zilog", | |
1888 | .match_table = pmz_match, | |
1889 | .probe = pmz_attach, | |
1890 | .remove = pmz_detach, | |
1891 | .suspend = pmz_suspend, | |
1892 | .resume = pmz_resume, | |
1893 | }; | |
1894 | ||
1895 | static int __init init_pmz(void) | |
1896 | { | |
1897 | int rc, i; | |
1898 | printk(KERN_INFO "%s\n", version); | |
1899 | ||
1900 | /* | |
1901 | * First, we need to do a direct OF-based probe pass. We | |
1902 | * do that because we want serial console up before the | |
1903 | * macio stuffs calls us back, and since that makes it | |
1904 | * easier to pass the proper number of channels to | |
1905 | * uart_register_driver() | |
1906 | */ | |
1907 | if (pmz_ports_count == 0) | |
1908 | pmz_probe(); | |
1909 | ||
1910 | /* | |
1911 | * Bail early if no port found | |
1912 | */ | |
1913 | if (pmz_ports_count == 0) | |
1914 | return -ENODEV; | |
1915 | ||
1916 | /* | |
1917 | * Now we register with the serial layer | |
1918 | */ | |
1919 | rc = pmz_register(); | |
1920 | if (rc) { | |
1921 | printk(KERN_ERR | |
1922 | "pmac_zilog: Error registering serial device, disabling pmac_zilog.\n" | |
1923 | "pmac_zilog: Did another serial driver already claim the minors?\n"); | |
1924 | /* effectively "pmz_unprobe()" */ | |
1925 | for (i=0; i < pmz_ports_count; i++) | |
1926 | pmz_dispose_port(&pmz_ports[i]); | |
1927 | return rc; | |
1928 | } | |
1929 | ||
1930 | /* | |
1931 | * Then we register the macio driver itself | |
1932 | */ | |
1933 | return macio_register_driver(&pmz_driver); | |
1934 | } | |
1935 | ||
1936 | static void __exit exit_pmz(void) | |
1937 | { | |
1938 | int i; | |
1939 | ||
1940 | /* Get rid of macio-driver (detach from macio) */ | |
1941 | macio_unregister_driver(&pmz_driver); | |
1942 | ||
1943 | for (i = 0; i < pmz_ports_count; i++) { | |
1944 | struct uart_pmac_port *uport = &pmz_ports[i]; | |
1945 | if (uport->node != NULL) { | |
1946 | uart_remove_one_port(&pmz_uart_reg, &uport->port); | |
1947 | pmz_dispose_port(uport); | |
1948 | } | |
1949 | } | |
1950 | /* Unregister UART driver */ | |
1951 | uart_unregister_driver(&pmz_uart_reg); | |
1952 | } | |
1953 | ||
1954 | #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE | |
1955 | ||
d358788f RK |
1956 | static void pmz_console_putchar(struct uart_port *port, int ch) |
1957 | { | |
1958 | struct uart_pmac_port *uap = (struct uart_pmac_port *)port; | |
1959 | ||
1960 | /* Wait for the transmit buffer to empty. */ | |
1961 | while ((read_zsreg(uap, R0) & Tx_BUF_EMP) == 0) | |
1962 | udelay(5); | |
1963 | write_zsdata(uap, ch); | |
1964 | } | |
1965 | ||
1da177e4 LT |
1966 | /* |
1967 | * Print a string to the serial port trying not to disturb | |
1968 | * any possible real use of the port... | |
1969 | */ | |
1970 | static void pmz_console_write(struct console *con, const char *s, unsigned int count) | |
1971 | { | |
1972 | struct uart_pmac_port *uap = &pmz_ports[con->index]; | |
1973 | unsigned long flags; | |
1da177e4 LT |
1974 | |
1975 | if (ZS_IS_ASLEEP(uap)) | |
1976 | return; | |
1977 | spin_lock_irqsave(&uap->port.lock, flags); | |
1978 | ||
1979 | /* Turn of interrupts and enable the transmitter. */ | |
1980 | write_zsreg(uap, R1, uap->curregs[1] & ~TxINT_ENAB); | |
1981 | write_zsreg(uap, R5, uap->curregs[5] | TxENABLE | RTS | DTR); | |
1982 | ||
d358788f | 1983 | uart_console_write(&uap->port, s, count, pmz_console_putchar); |
1da177e4 LT |
1984 | |
1985 | /* Restore the values in the registers. */ | |
1986 | write_zsreg(uap, R1, uap->curregs[1]); | |
1987 | /* Don't disable the transmitter. */ | |
1988 | ||
1989 | spin_unlock_irqrestore(&uap->port.lock, flags); | |
1990 | } | |
1991 | ||
1992 | /* | |
1993 | * Setup the serial console | |
1994 | */ | |
1995 | static int __init pmz_console_setup(struct console *co, char *options) | |
1996 | { | |
1997 | struct uart_pmac_port *uap; | |
1998 | struct uart_port *port; | |
1999 | int baud = 38400; | |
2000 | int bits = 8; | |
2001 | int parity = 'n'; | |
2002 | int flow = 'n'; | |
2003 | unsigned long pwr_delay; | |
2004 | ||
2005 | /* | |
2006 | * XServe's default to 57600 bps | |
2007 | */ | |
2008 | if (machine_is_compatible("RackMac1,1") | |
2009 | || machine_is_compatible("RackMac1,2") | |
2010 | || machine_is_compatible("MacRISC4")) | |
2011 | baud = 57600; | |
2012 | ||
2013 | /* | |
2014 | * Check whether an invalid uart number has been specified, and | |
2015 | * if so, search for the first available port that does have | |
2016 | * console support. | |
2017 | */ | |
2018 | if (co->index >= pmz_ports_count) | |
2019 | co->index = 0; | |
2020 | uap = &pmz_ports[co->index]; | |
2021 | if (uap->node == NULL) | |
2022 | return -ENODEV; | |
2023 | port = &uap->port; | |
2024 | ||
2025 | /* | |
2026 | * Mark port as beeing a console | |
2027 | */ | |
2028 | uap->flags |= PMACZILOG_FLAG_IS_CONS; | |
2029 | ||
2030 | /* | |
2031 | * Temporary fix for uart layer who didn't setup the spinlock yet | |
2032 | */ | |
2033 | spin_lock_init(&port->lock); | |
2034 | ||
2035 | /* | |
2036 | * Enable the hardware | |
2037 | */ | |
2038 | pwr_delay = __pmz_startup(uap); | |
2039 | if (pwr_delay) | |
2040 | mdelay(pwr_delay); | |
2041 | ||
2042 | if (options) | |
2043 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
2044 | ||
2045 | return uart_set_options(port, co, baud, parity, bits, flow); | |
2046 | } | |
2047 | ||
2048 | static int __init pmz_console_init(void) | |
2049 | { | |
2050 | /* Probe ports */ | |
2051 | pmz_probe(); | |
2052 | ||
2053 | /* TODO: Autoprobe console based on OF */ | |
2054 | /* pmz_console.index = i; */ | |
2055 | register_console(&pmz_console); | |
2056 | ||
2057 | return 0; | |
2058 | ||
2059 | } | |
2060 | console_initcall(pmz_console_init); | |
2061 | #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */ | |
2062 | ||
2063 | module_init(init_pmz); | |
2064 | module_exit(exit_pmz); |