Loading...
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Miscellaneous Mac68K-specific stuff
4 */
5
6#include <linux/types.h>
7#include <linux/errno.h>
8#include <linux/kernel.h>
9#include <linux/delay.h>
10#include <linux/sched.h>
11#include <linux/time.h>
12#include <linux/rtc.h>
13#include <linux/mm.h>
14
15#include <linux/adb.h>
16#include <linux/cuda.h>
17#include <linux/pmu.h>
18
19#include <linux/uaccess.h>
20#include <asm/io.h>
21#include <asm/setup.h>
22#include <asm/macintosh.h>
23#include <asm/mac_via.h>
24#include <asm/mac_oss.h>
25
26#include <asm/machdep.h>
27
28/*
29 * Offset between Unix time (1970-based) and Mac time (1904-based). Cuda and PMU
30 * times wrap in 2040. If we need to handle later times, the read_time functions
31 * need to be changed to interpret wrapped times as post-2040.
32 */
33
34#define RTC_OFFSET 2082844800
35
36static void (*rom_reset)(void);
37
38#if IS_ENABLED(CONFIG_NVRAM)
39#ifdef CONFIG_ADB_CUDA
40static unsigned char cuda_pram_read_byte(int offset)
41{
42 struct adb_request req;
43
44 if (cuda_request(&req, NULL, 4, CUDA_PACKET, CUDA_GET_PRAM,
45 (offset >> 8) & 0xFF, offset & 0xFF) < 0)
46 return 0;
47 while (!req.complete)
48 cuda_poll();
49 return req.reply[3];
50}
51
52static void cuda_pram_write_byte(unsigned char data, int offset)
53{
54 struct adb_request req;
55
56 if (cuda_request(&req, NULL, 5, CUDA_PACKET, CUDA_SET_PRAM,
57 (offset >> 8) & 0xFF, offset & 0xFF, data) < 0)
58 return;
59 while (!req.complete)
60 cuda_poll();
61}
62#endif /* CONFIG_ADB_CUDA */
63
64#ifdef CONFIG_ADB_PMU
65static unsigned char pmu_pram_read_byte(int offset)
66{
67 struct adb_request req;
68
69 if (pmu_request(&req, NULL, 3, PMU_READ_XPRAM,
70 offset & 0xFF, 1) < 0)
71 return 0;
72 pmu_wait_complete(&req);
73
74 return req.reply[0];
75}
76
77static void pmu_pram_write_byte(unsigned char data, int offset)
78{
79 struct adb_request req;
80
81 if (pmu_request(&req, NULL, 4, PMU_WRITE_XPRAM,
82 offset & 0xFF, 1, data) < 0)
83 return;
84 pmu_wait_complete(&req);
85}
86#endif /* CONFIG_ADB_PMU */
87#endif /* CONFIG_NVRAM */
88
89/*
90 * VIA PRAM/RTC access routines
91 *
92 * Must be called with interrupts disabled and
93 * the RTC should be enabled.
94 */
95
96static __u8 via_rtc_recv(void)
97{
98 int i, reg;
99 __u8 data;
100
101 reg = via1[vBufB] & ~VIA1B_vRTCClk;
102
103 /* Set the RTC data line to be an input. */
104
105 via1[vDirB] &= ~VIA1B_vRTCData;
106
107 /* The bits of the byte come out in MSB order */
108
109 data = 0;
110 for (i = 0 ; i < 8 ; i++) {
111 via1[vBufB] = reg;
112 via1[vBufB] = reg | VIA1B_vRTCClk;
113 data = (data << 1) | (via1[vBufB] & VIA1B_vRTCData);
114 }
115
116 /* Return RTC data line to output state */
117
118 via1[vDirB] |= VIA1B_vRTCData;
119
120 return data;
121}
122
123static void via_rtc_send(__u8 data)
124{
125 int i, reg, bit;
126
127 reg = via1[vBufB] & ~(VIA1B_vRTCClk | VIA1B_vRTCData);
128
129 /* The bits of the byte go into the RTC in MSB order */
130
131 for (i = 0 ; i < 8 ; i++) {
132 bit = data & 0x80? 1 : 0;
133 data <<= 1;
134 via1[vBufB] = reg | bit;
135 via1[vBufB] = reg | bit | VIA1B_vRTCClk;
136 }
137}
138
139/*
140 * These values can be found in Inside Macintosh vol. III ch. 2
141 * which has a description of the RTC chip in the original Mac.
142 */
143
144#define RTC_FLG_READ BIT(7)
145#define RTC_FLG_WRITE_PROTECT BIT(7)
146#define RTC_CMD_READ(r) (RTC_FLG_READ | (r << 2))
147#define RTC_CMD_WRITE(r) (r << 2)
148#define RTC_REG_SECONDS_0 0
149#define RTC_REG_SECONDS_1 1
150#define RTC_REG_SECONDS_2 2
151#define RTC_REG_SECONDS_3 3
152#define RTC_REG_WRITE_PROTECT 13
153
154/*
155 * Inside Mac has no information about two-byte RTC commands but
156 * the MAME/MESS source code has the essentials.
157 */
158
159#define RTC_REG_XPRAM 14
160#define RTC_CMD_XPRAM_READ (RTC_CMD_READ(RTC_REG_XPRAM) << 8)
161#define RTC_CMD_XPRAM_WRITE (RTC_CMD_WRITE(RTC_REG_XPRAM) << 8)
162#define RTC_CMD_XPRAM_ARG(a) (((a & 0xE0) << 3) | ((a & 0x1F) << 2))
163
164/*
165 * Execute a VIA PRAM/RTC command. For read commands
166 * data should point to a one-byte buffer for the
167 * resulting data. For write commands it should point
168 * to the data byte to for the command.
169 *
170 * This function disables all interrupts while running.
171 */
172
173static void via_rtc_command(int command, __u8 *data)
174{
175 unsigned long flags;
176 int is_read;
177
178 local_irq_save(flags);
179
180 /* The least significant bits must be 0b01 according to Inside Mac */
181
182 command = (command & ~3) | 1;
183
184 /* Enable the RTC and make sure the strobe line is high */
185
186 via1[vBufB] = (via1[vBufB] | VIA1B_vRTCClk) & ~VIA1B_vRTCEnb;
187
188 if (command & 0xFF00) { /* extended (two-byte) command */
189 via_rtc_send((command & 0xFF00) >> 8);
190 via_rtc_send(command & 0xFF);
191 is_read = command & (RTC_FLG_READ << 8);
192 } else { /* one-byte command */
193 via_rtc_send(command);
194 is_read = command & RTC_FLG_READ;
195 }
196 if (is_read) {
197 *data = via_rtc_recv();
198 } else {
199 via_rtc_send(*data);
200 }
201
202 /* All done, disable the RTC */
203
204 via1[vBufB] |= VIA1B_vRTCEnb;
205
206 local_irq_restore(flags);
207}
208
209#if IS_ENABLED(CONFIG_NVRAM)
210static unsigned char via_pram_read_byte(int offset)
211{
212 unsigned char temp;
213
214 via_rtc_command(RTC_CMD_XPRAM_READ | RTC_CMD_XPRAM_ARG(offset), &temp);
215
216 return temp;
217}
218
219static void via_pram_write_byte(unsigned char data, int offset)
220{
221 unsigned char temp;
222
223 temp = 0x55;
224 via_rtc_command(RTC_CMD_WRITE(RTC_REG_WRITE_PROTECT), &temp);
225
226 temp = data;
227 via_rtc_command(RTC_CMD_XPRAM_WRITE | RTC_CMD_XPRAM_ARG(offset), &temp);
228
229 temp = 0x55 | RTC_FLG_WRITE_PROTECT;
230 via_rtc_command(RTC_CMD_WRITE(RTC_REG_WRITE_PROTECT), &temp);
231}
232#endif /* CONFIG_NVRAM */
233
234/*
235 * Return the current time in seconds since January 1, 1904.
236 *
237 * This only works on machines with the VIA-based PRAM/RTC, which
238 * is basically any machine with Mac II-style ADB.
239 */
240
241static time64_t via_read_time(void)
242{
243 union {
244 __u8 cdata[4];
245 __u32 idata;
246 } result, last_result;
247 int count = 1;
248
249 via_rtc_command(RTC_CMD_READ(RTC_REG_SECONDS_0), &last_result.cdata[3]);
250 via_rtc_command(RTC_CMD_READ(RTC_REG_SECONDS_1), &last_result.cdata[2]);
251 via_rtc_command(RTC_CMD_READ(RTC_REG_SECONDS_2), &last_result.cdata[1]);
252 via_rtc_command(RTC_CMD_READ(RTC_REG_SECONDS_3), &last_result.cdata[0]);
253
254 /*
255 * The NetBSD guys say to loop until you get the same reading
256 * twice in a row.
257 */
258
259 while (1) {
260 via_rtc_command(RTC_CMD_READ(RTC_REG_SECONDS_0),
261 &result.cdata[3]);
262 via_rtc_command(RTC_CMD_READ(RTC_REG_SECONDS_1),
263 &result.cdata[2]);
264 via_rtc_command(RTC_CMD_READ(RTC_REG_SECONDS_2),
265 &result.cdata[1]);
266 via_rtc_command(RTC_CMD_READ(RTC_REG_SECONDS_3),
267 &result.cdata[0]);
268
269 if (result.idata == last_result.idata)
270 return (time64_t)result.idata - RTC_OFFSET;
271
272 if (++count > 10)
273 break;
274
275 last_result.idata = result.idata;
276 }
277
278 pr_err("%s: failed to read a stable value; got 0x%08x then 0x%08x\n",
279 __func__, last_result.idata, result.idata);
280
281 return 0;
282}
283
284/*
285 * Set the current time to a number of seconds since January 1, 1904.
286 *
287 * This only works on machines with the VIA-based PRAM/RTC, which
288 * is basically any machine with Mac II-style ADB.
289 */
290
291static void via_set_rtc_time(struct rtc_time *tm)
292{
293 union {
294 __u8 cdata[4];
295 __u32 idata;
296 } data;
297 __u8 temp;
298 time64_t time;
299
300 time = mktime64(tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
301 tm->tm_hour, tm->tm_min, tm->tm_sec);
302
303 /* Clear the write protect bit */
304
305 temp = 0x55;
306 via_rtc_command(RTC_CMD_WRITE(RTC_REG_WRITE_PROTECT), &temp);
307
308 data.idata = lower_32_bits(time + RTC_OFFSET);
309 via_rtc_command(RTC_CMD_WRITE(RTC_REG_SECONDS_0), &data.cdata[3]);
310 via_rtc_command(RTC_CMD_WRITE(RTC_REG_SECONDS_1), &data.cdata[2]);
311 via_rtc_command(RTC_CMD_WRITE(RTC_REG_SECONDS_2), &data.cdata[1]);
312 via_rtc_command(RTC_CMD_WRITE(RTC_REG_SECONDS_3), &data.cdata[0]);
313
314 /* Set the write protect bit */
315
316 temp = 0x55 | RTC_FLG_WRITE_PROTECT;
317 via_rtc_command(RTC_CMD_WRITE(RTC_REG_WRITE_PROTECT), &temp);
318}
319
320static void via_shutdown(void)
321{
322 if (rbv_present) {
323 via2[rBufB] &= ~0x04;
324 } else {
325 /* Direction of vDirB is output */
326 via2[vDirB] |= 0x04;
327 /* Send a value of 0 on that line */
328 via2[vBufB] &= ~0x04;
329 mdelay(1000);
330 }
331}
332
333static void oss_shutdown(void)
334{
335 oss->rom_ctrl = OSS_POWEROFF;
336}
337
338#ifdef CONFIG_ADB_CUDA
339static void cuda_restart(void)
340{
341 struct adb_request req;
342
343 if (cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM) < 0)
344 return;
345 while (!req.complete)
346 cuda_poll();
347}
348
349static void cuda_shutdown(void)
350{
351 struct adb_request req;
352
353 if (cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN) < 0)
354 return;
355
356 /* Avoid infinite polling loop when PSU is not under Cuda control */
357 switch (macintosh_config->ident) {
358 case MAC_MODEL_C660:
359 case MAC_MODEL_Q605:
360 case MAC_MODEL_Q605_ACC:
361 case MAC_MODEL_P475:
362 case MAC_MODEL_P475F:
363 return;
364 }
365
366 while (!req.complete)
367 cuda_poll();
368}
369#endif /* CONFIG_ADB_CUDA */
370
371/*
372 *-------------------------------------------------------------------
373 * Below this point are the generic routines; they'll dispatch to the
374 * correct routine for the hardware on which we're running.
375 *-------------------------------------------------------------------
376 */
377
378#if IS_ENABLED(CONFIG_NVRAM)
379unsigned char mac_pram_read_byte(int addr)
380{
381 switch (macintosh_config->adb_type) {
382 case MAC_ADB_IOP:
383 case MAC_ADB_II:
384 case MAC_ADB_PB1:
385 return via_pram_read_byte(addr);
386#ifdef CONFIG_ADB_CUDA
387 case MAC_ADB_EGRET:
388 case MAC_ADB_CUDA:
389 return cuda_pram_read_byte(addr);
390#endif
391#ifdef CONFIG_ADB_PMU
392 case MAC_ADB_PB2:
393 return pmu_pram_read_byte(addr);
394#endif
395 default:
396 return 0xFF;
397 }
398}
399
400void mac_pram_write_byte(unsigned char val, int addr)
401{
402 switch (macintosh_config->adb_type) {
403 case MAC_ADB_IOP:
404 case MAC_ADB_II:
405 case MAC_ADB_PB1:
406 via_pram_write_byte(val, addr);
407 break;
408#ifdef CONFIG_ADB_CUDA
409 case MAC_ADB_EGRET:
410 case MAC_ADB_CUDA:
411 cuda_pram_write_byte(val, addr);
412 break;
413#endif
414#ifdef CONFIG_ADB_PMU
415 case MAC_ADB_PB2:
416 pmu_pram_write_byte(val, addr);
417 break;
418#endif
419 default:
420 break;
421 }
422}
423
424ssize_t mac_pram_get_size(void)
425{
426 return 256;
427}
428#endif /* CONFIG_NVRAM */
429
430void mac_poweroff(void)
431{
432 if (oss_present) {
433 oss_shutdown();
434 } else if (macintosh_config->adb_type == MAC_ADB_II) {
435 via_shutdown();
436#ifdef CONFIG_ADB_CUDA
437 } else if (macintosh_config->adb_type == MAC_ADB_EGRET ||
438 macintosh_config->adb_type == MAC_ADB_CUDA) {
439 cuda_shutdown();
440#endif
441#ifdef CONFIG_ADB_PMU
442 } else if (macintosh_config->adb_type == MAC_ADB_PB2) {
443 pmu_shutdown();
444#endif
445 }
446
447 pr_crit("It is now safe to turn off your Macintosh.\n");
448 local_irq_disable();
449 while(1);
450}
451
452void mac_reset(void)
453{
454 if (macintosh_config->adb_type == MAC_ADB_II &&
455 macintosh_config->ident != MAC_MODEL_SE30) {
456 /* need ROMBASE in booter */
457 /* indeed, plus need to MAP THE ROM !! */
458
459 if (mac_bi_data.rombase == 0)
460 mac_bi_data.rombase = 0x40800000;
461
462 /* works on some */
463 rom_reset = (void *) (mac_bi_data.rombase + 0xa);
464
465 local_irq_disable();
466 rom_reset();
467#ifdef CONFIG_ADB_CUDA
468 } else if (macintosh_config->adb_type == MAC_ADB_EGRET ||
469 macintosh_config->adb_type == MAC_ADB_CUDA) {
470 cuda_restart();
471#endif
472#ifdef CONFIG_ADB_PMU
473 } else if (macintosh_config->adb_type == MAC_ADB_PB2) {
474 pmu_restart();
475#endif
476 } else if (CPU_IS_030) {
477
478 /* 030-specific reset routine. The idea is general, but the
479 * specific registers to reset are '030-specific. Until I
480 * have a non-030 machine, I can't test anything else.
481 * -- C. Scott Ananian <cananian@alumni.princeton.edu>
482 */
483
484 unsigned long rombase = 0x40000000;
485
486 /* make a 1-to-1 mapping, using the transparent tran. reg. */
487 unsigned long virt = (unsigned long) mac_reset;
488 unsigned long phys = virt_to_phys(mac_reset);
489 unsigned long addr = (phys&0xFF000000)|0x8777;
490 unsigned long offset = phys-virt;
491
492 local_irq_disable(); /* lets not screw this up, ok? */
493 __asm__ __volatile__(".chip 68030\n\t"
494 "pmove %0,%/tt0\n\t"
495 ".chip 68k"
496 : : "m" (addr));
497 /* Now jump to physical address so we can disable MMU */
498 __asm__ __volatile__(
499 ".chip 68030\n\t"
500 "lea %/pc@(1f),%/a0\n\t"
501 "addl %0,%/a0\n\t"/* fixup target address and stack ptr */
502 "addl %0,%/sp\n\t"
503 "pflusha\n\t"
504 "jmp %/a0@\n\t" /* jump into physical memory */
505 "0:.long 0\n\t" /* a constant zero. */
506 /* OK. Now reset everything and jump to reset vector. */
507 "1:\n\t"
508 "lea %/pc@(0b),%/a0\n\t"
509 "pmove %/a0@, %/tc\n\t" /* disable mmu */
510 "pmove %/a0@, %/tt0\n\t" /* disable tt0 */
511 "pmove %/a0@, %/tt1\n\t" /* disable tt1 */
512 "movel #0, %/a0\n\t"
513 "movec %/a0, %/vbr\n\t" /* clear vector base register */
514 "movec %/a0, %/cacr\n\t" /* disable caches */
515 "movel #0x0808,%/a0\n\t"
516 "movec %/a0, %/cacr\n\t" /* flush i&d caches */
517 "movew #0x2700,%/sr\n\t" /* set up status register */
518 "movel %1@(0x0),%/a0\n\t"/* load interrupt stack pointer */
519 "movec %/a0, %/isp\n\t"
520 "movel %1@(0x4),%/a0\n\t" /* load reset vector */
521 "reset\n\t" /* reset external devices */
522 "jmp %/a0@\n\t" /* jump to the reset vector */
523 ".chip 68k"
524 : : "r" (offset), "a" (rombase) : "a0");
525 }
526
527 /* should never get here */
528 pr_crit("Restart failed. Please restart manually.\n");
529 local_irq_disable();
530 while(1);
531}
532
533/*
534 * This function translates seconds since 1970 into a proper date.
535 *
536 * Algorithm cribbed from glibc2.1, __offtime().
537 *
538 * This is roughly same as rtc_time64_to_tm(), which we should probably
539 * use here, but it's only available when CONFIG_RTC_LIB is enabled.
540 */
541#define SECS_PER_MINUTE (60)
542#define SECS_PER_HOUR (SECS_PER_MINUTE * 60)
543#define SECS_PER_DAY (SECS_PER_HOUR * 24)
544
545static void unmktime(time64_t time, long offset,
546 int *yearp, int *monp, int *dayp,
547 int *hourp, int *minp, int *secp)
548{
549 /* How many days come before each month (0-12). */
550 static const unsigned short int __mon_yday[2][13] =
551 {
552 /* Normal years. */
553 { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
554 /* Leap years. */
555 { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
556 };
557 int days, rem, y, wday, yday;
558 const unsigned short int *ip;
559
560 days = div_u64_rem(time, SECS_PER_DAY, &rem);
561 rem += offset;
562 while (rem < 0) {
563 rem += SECS_PER_DAY;
564 --days;
565 }
566 while (rem >= SECS_PER_DAY) {
567 rem -= SECS_PER_DAY;
568 ++days;
569 }
570 *hourp = rem / SECS_PER_HOUR;
571 rem %= SECS_PER_HOUR;
572 *minp = rem / SECS_PER_MINUTE;
573 *secp = rem % SECS_PER_MINUTE;
574 /* January 1, 1970 was a Thursday. */
575 wday = (4 + days) % 7; /* Day in the week. Not currently used */
576 if (wday < 0) wday += 7;
577 y = 1970;
578
579#define DIV(a, b) ((a) / (b) - ((a) % (b) < 0))
580#define LEAPS_THRU_END_OF(y) (DIV (y, 4) - DIV (y, 100) + DIV (y, 400))
581#define __isleap(year) \
582 ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
583
584 while (days < 0 || days >= (__isleap (y) ? 366 : 365))
585 {
586 /* Guess a corrected year, assuming 365 days per year. */
587 long int yg = y + days / 365 - (days % 365 < 0);
588
589 /* Adjust DAYS and Y to match the guessed year. */
590 days -= (yg - y) * 365 +
591 LEAPS_THRU_END_OF(yg - 1) - LEAPS_THRU_END_OF(y - 1);
592 y = yg;
593 }
594 *yearp = y - 1900;
595 yday = days; /* day in the year. Not currently used. */
596 ip = __mon_yday[__isleap(y)];
597 for (y = 11; days < (long int) ip[y]; --y)
598 continue;
599 days -= ip[y];
600 *monp = y;
601 *dayp = days + 1; /* day in the month */
602 return;
603}
604
605/*
606 * Read/write the hardware clock.
607 */
608
609int mac_hwclk(int op, struct rtc_time *t)
610{
611 time64_t now;
612
613 if (!op) { /* read */
614 switch (macintosh_config->adb_type) {
615 case MAC_ADB_IOP:
616 case MAC_ADB_II:
617 case MAC_ADB_PB1:
618 now = via_read_time();
619 break;
620#ifdef CONFIG_ADB_CUDA
621 case MAC_ADB_EGRET:
622 case MAC_ADB_CUDA:
623 now = cuda_get_time();
624 break;
625#endif
626#ifdef CONFIG_ADB_PMU
627 case MAC_ADB_PB2:
628 now = pmu_get_time();
629 break;
630#endif
631 default:
632 now = 0;
633 }
634
635 t->tm_wday = 0;
636 unmktime(now, 0,
637 &t->tm_year, &t->tm_mon, &t->tm_mday,
638 &t->tm_hour, &t->tm_min, &t->tm_sec);
639 pr_debug("%s: read %ptR\n", __func__, t);
640 } else { /* write */
641 pr_debug("%s: tried to write %ptR\n", __func__, t);
642
643 switch (macintosh_config->adb_type) {
644 case MAC_ADB_IOP:
645 case MAC_ADB_II:
646 case MAC_ADB_PB1:
647 via_set_rtc_time(t);
648 break;
649#ifdef CONFIG_ADB_CUDA
650 case MAC_ADB_EGRET:
651 case MAC_ADB_CUDA:
652 cuda_set_rtc_time(t);
653 break;
654#endif
655#ifdef CONFIG_ADB_PMU
656 case MAC_ADB_PB2:
657 pmu_set_rtc_time(t);
658 break;
659#endif
660 default:
661 return -ENODEV;
662 }
663 }
664 return 0;
665}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Miscellaneous Mac68K-specific stuff
4 */
5
6#include <linux/types.h>
7#include <linux/errno.h>
8#include <linux/kernel.h>
9#include <linux/delay.h>
10#include <linux/sched.h>
11#include <linux/time.h>
12#include <linux/rtc.h>
13#include <linux/mm.h>
14
15#include <linux/adb.h>
16#include <linux/cuda.h>
17#include <linux/pmu.h>
18
19#include <linux/uaccess.h>
20#include <asm/io.h>
21#include <asm/segment.h>
22#include <asm/setup.h>
23#include <asm/macintosh.h>
24#include <asm/mac_via.h>
25#include <asm/mac_oss.h>
26
27#include <asm/machdep.h>
28
29/*
30 * Offset between Unix time (1970-based) and Mac time (1904-based). Cuda and PMU
31 * times wrap in 2040. If we need to handle later times, the read_time functions
32 * need to be changed to interpret wrapped times as post-2040.
33 */
34
35#define RTC_OFFSET 2082844800
36
37static void (*rom_reset)(void);
38
39#if IS_ENABLED(CONFIG_NVRAM)
40#ifdef CONFIG_ADB_CUDA
41static unsigned char cuda_pram_read_byte(int offset)
42{
43 struct adb_request req;
44
45 if (cuda_request(&req, NULL, 4, CUDA_PACKET, CUDA_GET_PRAM,
46 (offset >> 8) & 0xFF, offset & 0xFF) < 0)
47 return 0;
48 while (!req.complete)
49 cuda_poll();
50 return req.reply[3];
51}
52
53static void cuda_pram_write_byte(unsigned char data, int offset)
54{
55 struct adb_request req;
56
57 if (cuda_request(&req, NULL, 5, CUDA_PACKET, CUDA_SET_PRAM,
58 (offset >> 8) & 0xFF, offset & 0xFF, data) < 0)
59 return;
60 while (!req.complete)
61 cuda_poll();
62}
63#endif /* CONFIG_ADB_CUDA */
64
65#ifdef CONFIG_ADB_PMU
66static unsigned char pmu_pram_read_byte(int offset)
67{
68 struct adb_request req;
69
70 if (pmu_request(&req, NULL, 3, PMU_READ_XPRAM,
71 offset & 0xFF, 1) < 0)
72 return 0;
73 pmu_wait_complete(&req);
74
75 return req.reply[0];
76}
77
78static void pmu_pram_write_byte(unsigned char data, int offset)
79{
80 struct adb_request req;
81
82 if (pmu_request(&req, NULL, 4, PMU_WRITE_XPRAM,
83 offset & 0xFF, 1, data) < 0)
84 return;
85 pmu_wait_complete(&req);
86}
87#endif /* CONFIG_ADB_PMU */
88#endif /* CONFIG_NVRAM */
89
90/*
91 * VIA PRAM/RTC access routines
92 *
93 * Must be called with interrupts disabled and
94 * the RTC should be enabled.
95 */
96
97static __u8 via_rtc_recv(void)
98{
99 int i, reg;
100 __u8 data;
101
102 reg = via1[vBufB] & ~VIA1B_vRTCClk;
103
104 /* Set the RTC data line to be an input. */
105
106 via1[vDirB] &= ~VIA1B_vRTCData;
107
108 /* The bits of the byte come out in MSB order */
109
110 data = 0;
111 for (i = 0 ; i < 8 ; i++) {
112 via1[vBufB] = reg;
113 via1[vBufB] = reg | VIA1B_vRTCClk;
114 data = (data << 1) | (via1[vBufB] & VIA1B_vRTCData);
115 }
116
117 /* Return RTC data line to output state */
118
119 via1[vDirB] |= VIA1B_vRTCData;
120
121 return data;
122}
123
124static void via_rtc_send(__u8 data)
125{
126 int i, reg, bit;
127
128 reg = via1[vBufB] & ~(VIA1B_vRTCClk | VIA1B_vRTCData);
129
130 /* The bits of the byte go in in MSB order */
131
132 for (i = 0 ; i < 8 ; i++) {
133 bit = data & 0x80? 1 : 0;
134 data <<= 1;
135 via1[vBufB] = reg | bit;
136 via1[vBufB] = reg | bit | VIA1B_vRTCClk;
137 }
138}
139
140/*
141 * These values can be found in Inside Macintosh vol. III ch. 2
142 * which has a description of the RTC chip in the original Mac.
143 */
144
145#define RTC_FLG_READ BIT(7)
146#define RTC_FLG_WRITE_PROTECT BIT(7)
147#define RTC_CMD_READ(r) (RTC_FLG_READ | (r << 2))
148#define RTC_CMD_WRITE(r) (r << 2)
149#define RTC_REG_SECONDS_0 0
150#define RTC_REG_SECONDS_1 1
151#define RTC_REG_SECONDS_2 2
152#define RTC_REG_SECONDS_3 3
153#define RTC_REG_WRITE_PROTECT 13
154
155/*
156 * Inside Mac has no information about two-byte RTC commands but
157 * the MAME/MESS source code has the essentials.
158 */
159
160#define RTC_REG_XPRAM 14
161#define RTC_CMD_XPRAM_READ (RTC_CMD_READ(RTC_REG_XPRAM) << 8)
162#define RTC_CMD_XPRAM_WRITE (RTC_CMD_WRITE(RTC_REG_XPRAM) << 8)
163#define RTC_CMD_XPRAM_ARG(a) (((a & 0xE0) << 3) | ((a & 0x1F) << 2))
164
165/*
166 * Execute a VIA PRAM/RTC command. For read commands
167 * data should point to a one-byte buffer for the
168 * resulting data. For write commands it should point
169 * to the data byte to for the command.
170 *
171 * This function disables all interrupts while running.
172 */
173
174static void via_rtc_command(int command, __u8 *data)
175{
176 unsigned long flags;
177 int is_read;
178
179 local_irq_save(flags);
180
181 /* The least significant bits must be 0b01 according to Inside Mac */
182
183 command = (command & ~3) | 1;
184
185 /* Enable the RTC and make sure the strobe line is high */
186
187 via1[vBufB] = (via1[vBufB] | VIA1B_vRTCClk) & ~VIA1B_vRTCEnb;
188
189 if (command & 0xFF00) { /* extended (two-byte) command */
190 via_rtc_send((command & 0xFF00) >> 8);
191 via_rtc_send(command & 0xFF);
192 is_read = command & (RTC_FLG_READ << 8);
193 } else { /* one-byte command */
194 via_rtc_send(command);
195 is_read = command & RTC_FLG_READ;
196 }
197 if (is_read) {
198 *data = via_rtc_recv();
199 } else {
200 via_rtc_send(*data);
201 }
202
203 /* All done, disable the RTC */
204
205 via1[vBufB] |= VIA1B_vRTCEnb;
206
207 local_irq_restore(flags);
208}
209
210#if IS_ENABLED(CONFIG_NVRAM)
211static unsigned char via_pram_read_byte(int offset)
212{
213 unsigned char temp;
214
215 via_rtc_command(RTC_CMD_XPRAM_READ | RTC_CMD_XPRAM_ARG(offset), &temp);
216
217 return temp;
218}
219
220static void via_pram_write_byte(unsigned char data, int offset)
221{
222 unsigned char temp;
223
224 temp = 0x55;
225 via_rtc_command(RTC_CMD_WRITE(RTC_REG_WRITE_PROTECT), &temp);
226
227 temp = data;
228 via_rtc_command(RTC_CMD_XPRAM_WRITE | RTC_CMD_XPRAM_ARG(offset), &temp);
229
230 temp = 0x55 | RTC_FLG_WRITE_PROTECT;
231 via_rtc_command(RTC_CMD_WRITE(RTC_REG_WRITE_PROTECT), &temp);
232}
233#endif /* CONFIG_NVRAM */
234
235/*
236 * Return the current time in seconds since January 1, 1904.
237 *
238 * This only works on machines with the VIA-based PRAM/RTC, which
239 * is basically any machine with Mac II-style ADB.
240 */
241
242static time64_t via_read_time(void)
243{
244 union {
245 __u8 cdata[4];
246 __u32 idata;
247 } result, last_result;
248 int count = 1;
249
250 via_rtc_command(RTC_CMD_READ(RTC_REG_SECONDS_0), &last_result.cdata[3]);
251 via_rtc_command(RTC_CMD_READ(RTC_REG_SECONDS_1), &last_result.cdata[2]);
252 via_rtc_command(RTC_CMD_READ(RTC_REG_SECONDS_2), &last_result.cdata[1]);
253 via_rtc_command(RTC_CMD_READ(RTC_REG_SECONDS_3), &last_result.cdata[0]);
254
255 /*
256 * The NetBSD guys say to loop until you get the same reading
257 * twice in a row.
258 */
259
260 while (1) {
261 via_rtc_command(RTC_CMD_READ(RTC_REG_SECONDS_0),
262 &result.cdata[3]);
263 via_rtc_command(RTC_CMD_READ(RTC_REG_SECONDS_1),
264 &result.cdata[2]);
265 via_rtc_command(RTC_CMD_READ(RTC_REG_SECONDS_2),
266 &result.cdata[1]);
267 via_rtc_command(RTC_CMD_READ(RTC_REG_SECONDS_3),
268 &result.cdata[0]);
269
270 if (result.idata == last_result.idata)
271 return (time64_t)result.idata - RTC_OFFSET;
272
273 if (++count > 10)
274 break;
275
276 last_result.idata = result.idata;
277 }
278
279 pr_err("%s: failed to read a stable value; got 0x%08x then 0x%08x\n",
280 __func__, last_result.idata, result.idata);
281
282 return 0;
283}
284
285/*
286 * Set the current time to a number of seconds since January 1, 1904.
287 *
288 * This only works on machines with the VIA-based PRAM/RTC, which
289 * is basically any machine with Mac II-style ADB.
290 */
291
292static void via_set_rtc_time(struct rtc_time *tm)
293{
294 union {
295 __u8 cdata[4];
296 __u32 idata;
297 } data;
298 __u8 temp;
299 time64_t time;
300
301 time = mktime64(tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
302 tm->tm_hour, tm->tm_min, tm->tm_sec);
303
304 /* Clear the write protect bit */
305
306 temp = 0x55;
307 via_rtc_command(RTC_CMD_WRITE(RTC_REG_WRITE_PROTECT), &temp);
308
309 data.idata = lower_32_bits(time + RTC_OFFSET);
310 via_rtc_command(RTC_CMD_WRITE(RTC_REG_SECONDS_0), &data.cdata[3]);
311 via_rtc_command(RTC_CMD_WRITE(RTC_REG_SECONDS_1), &data.cdata[2]);
312 via_rtc_command(RTC_CMD_WRITE(RTC_REG_SECONDS_2), &data.cdata[1]);
313 via_rtc_command(RTC_CMD_WRITE(RTC_REG_SECONDS_3), &data.cdata[0]);
314
315 /* Set the write protect bit */
316
317 temp = 0x55 | RTC_FLG_WRITE_PROTECT;
318 via_rtc_command(RTC_CMD_WRITE(RTC_REG_WRITE_PROTECT), &temp);
319}
320
321static void via_shutdown(void)
322{
323 if (rbv_present) {
324 via2[rBufB] &= ~0x04;
325 } else {
326 /* Direction of vDirB is output */
327 via2[vDirB] |= 0x04;
328 /* Send a value of 0 on that line */
329 via2[vBufB] &= ~0x04;
330 mdelay(1000);
331 }
332}
333
334static void oss_shutdown(void)
335{
336 oss->rom_ctrl = OSS_POWEROFF;
337}
338
339#ifdef CONFIG_ADB_CUDA
340static void cuda_restart(void)
341{
342 struct adb_request req;
343
344 if (cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM) < 0)
345 return;
346 while (!req.complete)
347 cuda_poll();
348}
349
350static void cuda_shutdown(void)
351{
352 struct adb_request req;
353
354 if (cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN) < 0)
355 return;
356
357 /* Avoid infinite polling loop when PSU is not under Cuda control */
358 switch (macintosh_config->ident) {
359 case MAC_MODEL_C660:
360 case MAC_MODEL_Q605:
361 case MAC_MODEL_Q605_ACC:
362 case MAC_MODEL_P475:
363 case MAC_MODEL_P475F:
364 return;
365 }
366
367 while (!req.complete)
368 cuda_poll();
369}
370#endif /* CONFIG_ADB_CUDA */
371
372/*
373 *-------------------------------------------------------------------
374 * Below this point are the generic routines; they'll dispatch to the
375 * correct routine for the hardware on which we're running.
376 *-------------------------------------------------------------------
377 */
378
379#if IS_ENABLED(CONFIG_NVRAM)
380unsigned char mac_pram_read_byte(int addr)
381{
382 switch (macintosh_config->adb_type) {
383 case MAC_ADB_IOP:
384 case MAC_ADB_II:
385 case MAC_ADB_PB1:
386 return via_pram_read_byte(addr);
387#ifdef CONFIG_ADB_CUDA
388 case MAC_ADB_EGRET:
389 case MAC_ADB_CUDA:
390 return cuda_pram_read_byte(addr);
391#endif
392#ifdef CONFIG_ADB_PMU
393 case MAC_ADB_PB2:
394 return pmu_pram_read_byte(addr);
395#endif
396 default:
397 return 0xFF;
398 }
399}
400
401void mac_pram_write_byte(unsigned char val, int addr)
402{
403 switch (macintosh_config->adb_type) {
404 case MAC_ADB_IOP:
405 case MAC_ADB_II:
406 case MAC_ADB_PB1:
407 via_pram_write_byte(val, addr);
408 break;
409#ifdef CONFIG_ADB_CUDA
410 case MAC_ADB_EGRET:
411 case MAC_ADB_CUDA:
412 cuda_pram_write_byte(val, addr);
413 break;
414#endif
415#ifdef CONFIG_ADB_PMU
416 case MAC_ADB_PB2:
417 pmu_pram_write_byte(val, addr);
418 break;
419#endif
420 default:
421 break;
422 }
423}
424
425ssize_t mac_pram_get_size(void)
426{
427 return 256;
428}
429#endif /* CONFIG_NVRAM */
430
431void mac_poweroff(void)
432{
433 if (oss_present) {
434 oss_shutdown();
435 } else if (macintosh_config->adb_type == MAC_ADB_II) {
436 via_shutdown();
437#ifdef CONFIG_ADB_CUDA
438 } else if (macintosh_config->adb_type == MAC_ADB_EGRET ||
439 macintosh_config->adb_type == MAC_ADB_CUDA) {
440 cuda_shutdown();
441#endif
442#ifdef CONFIG_ADB_PMU
443 } else if (macintosh_config->adb_type == MAC_ADB_PB2) {
444 pmu_shutdown();
445#endif
446 }
447
448 pr_crit("It is now safe to turn off your Macintosh.\n");
449 local_irq_disable();
450 while(1);
451}
452
453void mac_reset(void)
454{
455 if (macintosh_config->adb_type == MAC_ADB_II &&
456 macintosh_config->ident != MAC_MODEL_SE30) {
457 /* need ROMBASE in booter */
458 /* indeed, plus need to MAP THE ROM !! */
459
460 if (mac_bi_data.rombase == 0)
461 mac_bi_data.rombase = 0x40800000;
462
463 /* works on some */
464 rom_reset = (void *) (mac_bi_data.rombase + 0xa);
465
466 local_irq_disable();
467 rom_reset();
468#ifdef CONFIG_ADB_CUDA
469 } else if (macintosh_config->adb_type == MAC_ADB_EGRET ||
470 macintosh_config->adb_type == MAC_ADB_CUDA) {
471 cuda_restart();
472#endif
473#ifdef CONFIG_ADB_PMU
474 } else if (macintosh_config->adb_type == MAC_ADB_PB2) {
475 pmu_restart();
476#endif
477 } else if (CPU_IS_030) {
478
479 /* 030-specific reset routine. The idea is general, but the
480 * specific registers to reset are '030-specific. Until I
481 * have a non-030 machine, I can't test anything else.
482 * -- C. Scott Ananian <cananian@alumni.princeton.edu>
483 */
484
485 unsigned long rombase = 0x40000000;
486
487 /* make a 1-to-1 mapping, using the transparent tran. reg. */
488 unsigned long virt = (unsigned long) mac_reset;
489 unsigned long phys = virt_to_phys(mac_reset);
490 unsigned long addr = (phys&0xFF000000)|0x8777;
491 unsigned long offset = phys-virt;
492
493 local_irq_disable(); /* lets not screw this up, ok? */
494 __asm__ __volatile__(".chip 68030\n\t"
495 "pmove %0,%/tt0\n\t"
496 ".chip 68k"
497 : : "m" (addr));
498 /* Now jump to physical address so we can disable MMU */
499 __asm__ __volatile__(
500 ".chip 68030\n\t"
501 "lea %/pc@(1f),%/a0\n\t"
502 "addl %0,%/a0\n\t"/* fixup target address and stack ptr */
503 "addl %0,%/sp\n\t"
504 "pflusha\n\t"
505 "jmp %/a0@\n\t" /* jump into physical memory */
506 "0:.long 0\n\t" /* a constant zero. */
507 /* OK. Now reset everything and jump to reset vector. */
508 "1:\n\t"
509 "lea %/pc@(0b),%/a0\n\t"
510 "pmove %/a0@, %/tc\n\t" /* disable mmu */
511 "pmove %/a0@, %/tt0\n\t" /* disable tt0 */
512 "pmove %/a0@, %/tt1\n\t" /* disable tt1 */
513 "movel #0, %/a0\n\t"
514 "movec %/a0, %/vbr\n\t" /* clear vector base register */
515 "movec %/a0, %/cacr\n\t" /* disable caches */
516 "movel #0x0808,%/a0\n\t"
517 "movec %/a0, %/cacr\n\t" /* flush i&d caches */
518 "movew #0x2700,%/sr\n\t" /* set up status register */
519 "movel %1@(0x0),%/a0\n\t"/* load interrupt stack pointer */
520 "movec %/a0, %/isp\n\t"
521 "movel %1@(0x4),%/a0\n\t" /* load reset vector */
522 "reset\n\t" /* reset external devices */
523 "jmp %/a0@\n\t" /* jump to the reset vector */
524 ".chip 68k"
525 : : "r" (offset), "a" (rombase) : "a0");
526 }
527
528 /* should never get here */
529 pr_crit("Restart failed. Please restart manually.\n");
530 local_irq_disable();
531 while(1);
532}
533
534/*
535 * This function translates seconds since 1970 into a proper date.
536 *
537 * Algorithm cribbed from glibc2.1, __offtime().
538 *
539 * This is roughly same as rtc_time64_to_tm(), which we should probably
540 * use here, but it's only available when CONFIG_RTC_LIB is enabled.
541 */
542#define SECS_PER_MINUTE (60)
543#define SECS_PER_HOUR (SECS_PER_MINUTE * 60)
544#define SECS_PER_DAY (SECS_PER_HOUR * 24)
545
546static void unmktime(time64_t time, long offset,
547 int *yearp, int *monp, int *dayp,
548 int *hourp, int *minp, int *secp)
549{
550 /* How many days come before each month (0-12). */
551 static const unsigned short int __mon_yday[2][13] =
552 {
553 /* Normal years. */
554 { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
555 /* Leap years. */
556 { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
557 };
558 int days, rem, y, wday, yday;
559 const unsigned short int *ip;
560
561 days = div_u64_rem(time, SECS_PER_DAY, &rem);
562 rem += offset;
563 while (rem < 0) {
564 rem += SECS_PER_DAY;
565 --days;
566 }
567 while (rem >= SECS_PER_DAY) {
568 rem -= SECS_PER_DAY;
569 ++days;
570 }
571 *hourp = rem / SECS_PER_HOUR;
572 rem %= SECS_PER_HOUR;
573 *minp = rem / SECS_PER_MINUTE;
574 *secp = rem % SECS_PER_MINUTE;
575 /* January 1, 1970 was a Thursday. */
576 wday = (4 + days) % 7; /* Day in the week. Not currently used */
577 if (wday < 0) wday += 7;
578 y = 1970;
579
580#define DIV(a, b) ((a) / (b) - ((a) % (b) < 0))
581#define LEAPS_THRU_END_OF(y) (DIV (y, 4) - DIV (y, 100) + DIV (y, 400))
582#define __isleap(year) \
583 ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
584
585 while (days < 0 || days >= (__isleap (y) ? 366 : 365))
586 {
587 /* Guess a corrected year, assuming 365 days per year. */
588 long int yg = y + days / 365 - (days % 365 < 0);
589
590 /* Adjust DAYS and Y to match the guessed year. */
591 days -= (yg - y) * 365 +
592 LEAPS_THRU_END_OF(yg - 1) - LEAPS_THRU_END_OF(y - 1);
593 y = yg;
594 }
595 *yearp = y - 1900;
596 yday = days; /* day in the year. Not currently used. */
597 ip = __mon_yday[__isleap(y)];
598 for (y = 11; days < (long int) ip[y]; --y)
599 continue;
600 days -= ip[y];
601 *monp = y;
602 *dayp = days + 1; /* day in the month */
603 return;
604}
605
606/*
607 * Read/write the hardware clock.
608 */
609
610int mac_hwclk(int op, struct rtc_time *t)
611{
612 time64_t now;
613
614 if (!op) { /* read */
615 switch (macintosh_config->adb_type) {
616 case MAC_ADB_IOP:
617 case MAC_ADB_II:
618 case MAC_ADB_PB1:
619 now = via_read_time();
620 break;
621#ifdef CONFIG_ADB_CUDA
622 case MAC_ADB_EGRET:
623 case MAC_ADB_CUDA:
624 now = cuda_get_time();
625 break;
626#endif
627#ifdef CONFIG_ADB_PMU
628 case MAC_ADB_PB2:
629 now = pmu_get_time();
630 break;
631#endif
632 default:
633 now = 0;
634 }
635
636 t->tm_wday = 0;
637 unmktime(now, 0,
638 &t->tm_year, &t->tm_mon, &t->tm_mday,
639 &t->tm_hour, &t->tm_min, &t->tm_sec);
640 pr_debug("%s: read %ptR\n", __func__, t);
641 } else { /* write */
642 pr_debug("%s: tried to write %ptR\n", __func__, t);
643
644 switch (macintosh_config->adb_type) {
645 case MAC_ADB_IOP:
646 case MAC_ADB_II:
647 case MAC_ADB_PB1:
648 via_set_rtc_time(t);
649 break;
650#ifdef CONFIG_ADB_CUDA
651 case MAC_ADB_EGRET:
652 case MAC_ADB_CUDA:
653 cuda_set_rtc_time(t);
654 break;
655#endif
656#ifdef CONFIG_ADB_PMU
657 case MAC_ADB_PB2:
658 pmu_set_rtc_time(t);
659 break;
660#endif
661 default:
662 return -ENODEV;
663 }
664 }
665 return 0;
666}