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
37 static void (*rom_reset)(void);
38
39 #if IS_ENABLED(CONFIG_NVRAM)
40 #ifdef CONFIG_ADB_CUDA
cuda_pram_read_byte(int offset)41 static 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
cuda_pram_write_byte(unsigned char data,int offset)53 static 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
pmu_pram_read_byte(int offset)66 static 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
pmu_pram_write_byte(unsigned char data,int offset)78 static 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
via_rtc_recv(void)97 static __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
via_rtc_send(__u8 data)124 static 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
via_rtc_command(int command,__u8 * data)174 static 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)
via_pram_read_byte(int offset)211 static 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
via_pram_write_byte(unsigned char data,int offset)220 static 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
via_read_time(void)242 static 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
via_set_rtc_time(struct rtc_time * tm)292 static 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
via_shutdown(void)321 static 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
oss_shutdown(void)334 static void oss_shutdown(void)
335 {
336 oss->rom_ctrl = OSS_POWEROFF;
337 }
338
339 #ifdef CONFIG_ADB_CUDA
cuda_restart(void)340 static 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
cuda_shutdown(void)350 static 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)
mac_pram_read_byte(int addr)380 unsigned 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
mac_pram_write_byte(unsigned char val,int addr)401 void 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
mac_pram_get_size(void)425 ssize_t mac_pram_get_size(void)
426 {
427 return 256;
428 }
429 #endif /* CONFIG_NVRAM */
430
mac_poweroff(void)431 void 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
mac_reset(void)453 void 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
unmktime(time64_t time,long offset,int * yearp,int * monp,int * dayp,int * hourp,int * minp,int * secp)546 static 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
mac_hwclk(int op,struct rtc_time * t)610 int 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 }
667
