1 // SPDX-License-Identifier: GPL-2.0
3 * Miscellaneous Mac68K-specific stuff
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>
15 #include <linux/adb.h>
16 #include <linux/cuda.h>
17 #include <linux/pmu.h>
19 #include <linux/uaccess.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>
27 #include <asm/machdep.h>
29 /* Offset between Unix time (1970-based) and Mac time (1904-based) */
31 #define RTC_OFFSET 2082844800
33 static void (*rom_reset)(void);
35 #ifdef CONFIG_ADB_CUDA
36 static long cuda_read_time(void)
38 struct adb_request req;
41 if (cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_GET_TIME) < 0)
46 time = (req.reply[3] << 24) | (req.reply[4] << 16) |
47 (req.reply[5] << 8) | req.reply[6];
48 return time - RTC_OFFSET;
51 static void cuda_write_time(long data)
53 struct adb_request req;
56 if (cuda_request(&req, NULL, 6, CUDA_PACKET, CUDA_SET_TIME,
57 (data >> 24) & 0xFF, (data >> 16) & 0xFF,
58 (data >> 8) & 0xFF, data & 0xFF) < 0)
64 static __u8 cuda_read_pram(int offset)
66 struct adb_request req;
68 if (cuda_request(&req, NULL, 4, CUDA_PACKET, CUDA_GET_PRAM,
69 (offset >> 8) & 0xFF, offset & 0xFF) < 0)
76 static void cuda_write_pram(int offset, __u8 data)
78 struct adb_request req;
80 if (cuda_request(&req, NULL, 5, CUDA_PACKET, CUDA_SET_PRAM,
81 (offset >> 8) & 0xFF, offset & 0xFF, data) < 0)
86 #endif /* CONFIG_ADB_CUDA */
88 #ifdef CONFIG_ADB_PMU68K
89 static long pmu_read_time(void)
91 struct adb_request req;
94 if (pmu_request(&req, NULL, 1, PMU_READ_RTC) < 0)
99 time = (req.reply[1] << 24) | (req.reply[2] << 16) |
100 (req.reply[3] << 8) | req.reply[4];
101 return time - RTC_OFFSET;
104 static void pmu_write_time(long data)
106 struct adb_request req;
109 if (pmu_request(&req, NULL, 5, PMU_SET_RTC,
110 (data >> 24) & 0xFF, (data >> 16) & 0xFF,
111 (data >> 8) & 0xFF, data & 0xFF) < 0)
113 while (!req.complete)
117 static __u8 pmu_read_pram(int offset)
119 struct adb_request req;
121 if (pmu_request(&req, NULL, 3, PMU_READ_NVRAM,
122 (offset >> 8) & 0xFF, offset & 0xFF) < 0)
124 while (!req.complete)
129 static void pmu_write_pram(int offset, __u8 data)
131 struct adb_request req;
133 if (pmu_request(&req, NULL, 4, PMU_WRITE_NVRAM,
134 (offset >> 8) & 0xFF, offset & 0xFF, data) < 0)
136 while (!req.complete)
139 #endif /* CONFIG_ADB_PMU68K */
142 * VIA PRAM/RTC access routines
144 * Must be called with interrupts disabled and
145 * the RTC should be enabled.
148 static __u8 via_pram_readbyte(void)
153 reg = via1[vBufB] & ~VIA1B_vRTCClk;
155 /* Set the RTC data line to be an input. */
157 via1[vDirB] &= ~VIA1B_vRTCData;
159 /* The bits of the byte come out in MSB order */
162 for (i = 0 ; i < 8 ; i++) {
164 via1[vBufB] = reg | VIA1B_vRTCClk;
165 data = (data << 1) | (via1[vBufB] & VIA1B_vRTCData);
168 /* Return RTC data line to output state */
170 via1[vDirB] |= VIA1B_vRTCData;
175 static void via_pram_writebyte(__u8 data)
179 reg = via1[vBufB] & ~(VIA1B_vRTCClk | VIA1B_vRTCData);
181 /* The bits of the byte go in in MSB order */
183 for (i = 0 ; i < 8 ; i++) {
184 bit = data & 0x80? 1 : 0;
186 via1[vBufB] = reg | bit;
187 via1[vBufB] = reg | bit | VIA1B_vRTCClk;
192 * Execute a VIA PRAM/RTC command. For read commands
193 * data should point to a one-byte buffer for the
194 * resulting data. For write commands it should point
195 * to the data byte to for the command.
197 * This function disables all interrupts while running.
200 static void via_pram_command(int command, __u8 *data)
205 local_irq_save(flags);
207 /* Enable the RTC and make sure the strobe line is high */
209 via1[vBufB] = (via1[vBufB] | VIA1B_vRTCClk) & ~VIA1B_vRTCEnb;
211 if (command & 0xFF00) { /* extended (two-byte) command */
212 via_pram_writebyte((command & 0xFF00) >> 8);
213 via_pram_writebyte(command & 0xFF);
214 is_read = command & 0x8000;
215 } else { /* one-byte command */
216 via_pram_writebyte(command);
217 is_read = command & 0x80;
220 *data = via_pram_readbyte();
222 via_pram_writebyte(*data);
225 /* All done, disable the RTC */
227 via1[vBufB] |= VIA1B_vRTCEnb;
229 local_irq_restore(flags);
232 static __u8 via_read_pram(int offset)
237 static void via_write_pram(int offset, __u8 data)
242 * Return the current time in seconds since January 1, 1904.
244 * This only works on machines with the VIA-based PRAM/RTC, which
245 * is basically any machine with Mac II-style ADB.
248 static long via_read_time(void)
253 } result, last_result;
256 via_pram_command(0x81, &last_result.cdata[3]);
257 via_pram_command(0x85, &last_result.cdata[2]);
258 via_pram_command(0x89, &last_result.cdata[1]);
259 via_pram_command(0x8D, &last_result.cdata[0]);
262 * The NetBSD guys say to loop until you get the same reading
267 via_pram_command(0x81, &result.cdata[3]);
268 via_pram_command(0x85, &result.cdata[2]);
269 via_pram_command(0x89, &result.cdata[1]);
270 via_pram_command(0x8D, &result.cdata[0]);
272 if (result.idata == last_result.idata)
273 return result.idata - RTC_OFFSET;
278 last_result.idata = result.idata;
281 pr_err("via_read_time: failed to read a stable value; got 0x%08lx then 0x%08lx\n",
282 last_result.idata, result.idata);
288 * Set the current time to a number of seconds since January 1, 1904.
290 * This only works on machines with the VIA-based PRAM/RTC, which
291 * is basically any machine with Mac II-style ADB.
294 static void via_write_time(long time)
302 /* Clear the write protect bit */
305 via_pram_command(0x35, &temp);
307 data.idata = time + RTC_OFFSET;
308 via_pram_command(0x01, &data.cdata[3]);
309 via_pram_command(0x05, &data.cdata[2]);
310 via_pram_command(0x09, &data.cdata[1]);
311 via_pram_command(0x0D, &data.cdata[0]);
313 /* Set the write protect bit */
316 via_pram_command(0x35, &temp);
319 static void via_shutdown(void)
322 via2[rBufB] &= ~0x04;
324 /* Direction of vDirB is output */
326 /* Send a value of 0 on that line */
327 via2[vBufB] &= ~0x04;
332 static void oss_shutdown(void)
334 oss->rom_ctrl = OSS_POWEROFF;
337 #ifdef CONFIG_ADB_CUDA
338 static void cuda_restart(void)
340 struct adb_request req;
342 if (cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM) < 0)
344 while (!req.complete)
348 static void cuda_shutdown(void)
350 struct adb_request req;
352 if (cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN) < 0)
355 /* Avoid infinite polling loop when PSU is not under Cuda control */
356 switch (macintosh_config->ident) {
359 case MAC_MODEL_Q605_ACC:
361 case MAC_MODEL_P475F:
365 while (!req.complete)
368 #endif /* CONFIG_ADB_CUDA */
370 #ifdef CONFIG_ADB_PMU68K
372 void pmu_restart(void)
374 struct adb_request req;
375 if (pmu_request(&req, NULL,
376 2, PMU_SET_INTR_MASK, PMU_INT_ADB|PMU_INT_TICK) < 0)
378 while (!req.complete)
380 if (pmu_request(&req, NULL, 1, PMU_RESET) < 0)
382 while (!req.complete)
386 void pmu_shutdown(void)
388 struct adb_request req;
389 if (pmu_request(&req, NULL,
390 2, PMU_SET_INTR_MASK, PMU_INT_ADB|PMU_INT_TICK) < 0)
392 while (!req.complete)
394 if (pmu_request(&req, NULL, 5, PMU_SHUTDOWN, 'M', 'A', 'T', 'T') < 0)
396 while (!req.complete)
403 *-------------------------------------------------------------------
404 * Below this point are the generic routines; they'll dispatch to the
405 * correct routine for the hardware on which we're running.
406 *-------------------------------------------------------------------
409 void mac_pram_read(int offset, __u8 *buffer, int len)
414 switch (macintosh_config->adb_type) {
418 func = via_read_pram;
420 #ifdef CONFIG_ADB_CUDA
423 func = cuda_read_pram;
426 #ifdef CONFIG_ADB_PMU68K
428 func = pmu_read_pram;
434 for (i = 0 ; i < len ; i++) {
435 buffer[i] = (*func)(offset++);
439 void mac_pram_write(int offset, __u8 *buffer, int len)
441 void (*func)(int, __u8);
444 switch (macintosh_config->adb_type) {
448 func = via_write_pram;
450 #ifdef CONFIG_ADB_CUDA
453 func = cuda_write_pram;
456 #ifdef CONFIG_ADB_PMU68K
458 func = pmu_write_pram;
464 for (i = 0 ; i < len ; i++) {
465 (*func)(offset++, buffer[i]);
469 void mac_poweroff(void)
473 } else if (macintosh_config->adb_type == MAC_ADB_II) {
475 #ifdef CONFIG_ADB_CUDA
476 } else if (macintosh_config->adb_type == MAC_ADB_EGRET ||
477 macintosh_config->adb_type == MAC_ADB_CUDA) {
480 #ifdef CONFIG_ADB_PMU68K
481 } else if (macintosh_config->adb_type == MAC_ADB_PB1
482 || macintosh_config->adb_type == MAC_ADB_PB2) {
487 pr_crit("It is now safe to turn off your Macintosh.\n");
494 if (macintosh_config->adb_type == MAC_ADB_II) {
497 /* need ROMBASE in booter */
498 /* indeed, plus need to MAP THE ROM !! */
500 if (mac_bi_data.rombase == 0)
501 mac_bi_data.rombase = 0x40800000;
504 rom_reset = (void *) (mac_bi_data.rombase + 0xa);
506 if (macintosh_config->ident == MAC_MODEL_SE30) {
508 * MSch: Machines known to crash on ROM reset ...
511 local_irq_save(flags);
515 local_irq_restore(flags);
517 #ifdef CONFIG_ADB_CUDA
518 } else if (macintosh_config->adb_type == MAC_ADB_EGRET ||
519 macintosh_config->adb_type == MAC_ADB_CUDA) {
522 #ifdef CONFIG_ADB_PMU68K
523 } else if (macintosh_config->adb_type == MAC_ADB_PB1
524 || macintosh_config->adb_type == MAC_ADB_PB2) {
527 } else if (CPU_IS_030) {
529 /* 030-specific reset routine. The idea is general, but the
530 * specific registers to reset are '030-specific. Until I
531 * have a non-030 machine, I can't test anything else.
535 unsigned long rombase = 0x40000000;
537 /* make a 1-to-1 mapping, using the transparent tran. reg. */
538 unsigned long virt = (unsigned long) mac_reset;
539 unsigned long phys = virt_to_phys(mac_reset);
540 unsigned long addr = (phys&0xFF000000)|0x8777;
541 unsigned long offset = phys-virt;
543 local_irq_disable(); /* lets not screw this up, ok? */
544 __asm__ __volatile__(".chip 68030\n\t"
548 /* Now jump to physical address so we can disable MMU */
549 __asm__ __volatile__(
551 "lea %/pc@(1f),%/a0\n\t"
552 "addl %0,%/a0\n\t"/* fixup target address and stack ptr */
555 "jmp %/a0@\n\t" /* jump into physical memory */
556 "0:.long 0\n\t" /* a constant zero. */
557 /* OK. Now reset everything and jump to reset vector. */
559 "lea %/pc@(0b),%/a0\n\t"
560 "pmove %/a0@, %/tc\n\t" /* disable mmu */
561 "pmove %/a0@, %/tt0\n\t" /* disable tt0 */
562 "pmove %/a0@, %/tt1\n\t" /* disable tt1 */
564 "movec %/a0, %/vbr\n\t" /* clear vector base register */
565 "movec %/a0, %/cacr\n\t" /* disable caches */
566 "movel #0x0808,%/a0\n\t"
567 "movec %/a0, %/cacr\n\t" /* flush i&d caches */
568 "movew #0x2700,%/sr\n\t" /* set up status register */
569 "movel %1@(0x0),%/a0\n\t"/* load interrupt stack pointer */
570 "movec %/a0, %/isp\n\t"
571 "movel %1@(0x4),%/a0\n\t" /* load reset vector */
572 "reset\n\t" /* reset external devices */
573 "jmp %/a0@\n\t" /* jump to the reset vector */
575 : : "r" (offset), "a" (rombase) : "a0");
578 /* should never get here */
579 pr_crit("Restart failed. Please restart manually.\n");
585 * This function translates seconds since 1970 into a proper date.
587 * Algorithm cribbed from glibc2.1, __offtime().
589 #define SECS_PER_MINUTE (60)
590 #define SECS_PER_HOUR (SECS_PER_MINUTE * 60)
591 #define SECS_PER_DAY (SECS_PER_HOUR * 24)
593 static void unmktime(unsigned long time, long offset,
594 int *yearp, int *monp, int *dayp,
595 int *hourp, int *minp, int *secp)
597 /* How many days come before each month (0-12). */
598 static const unsigned short int __mon_yday[2][13] =
601 { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
603 { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
605 long int days, rem, y, wday, yday;
606 const unsigned short int *ip;
608 days = time / SECS_PER_DAY;
609 rem = time % SECS_PER_DAY;
615 while (rem >= SECS_PER_DAY) {
619 *hourp = rem / SECS_PER_HOUR;
620 rem %= SECS_PER_HOUR;
621 *minp = rem / SECS_PER_MINUTE;
622 *secp = rem % SECS_PER_MINUTE;
623 /* January 1, 1970 was a Thursday. */
624 wday = (4 + days) % 7; /* Day in the week. Not currently used */
625 if (wday < 0) wday += 7;
628 #define DIV(a, b) ((a) / (b) - ((a) % (b) < 0))
629 #define LEAPS_THRU_END_OF(y) (DIV (y, 4) - DIV (y, 100) + DIV (y, 400))
630 #define __isleap(year) \
631 ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
633 while (days < 0 || days >= (__isleap (y) ? 366 : 365))
635 /* Guess a corrected year, assuming 365 days per year. */
636 long int yg = y + days / 365 - (days % 365 < 0);
638 /* Adjust DAYS and Y to match the guessed year. */
639 days -= (yg - y) * 365 +
640 LEAPS_THRU_END_OF(yg - 1) - LEAPS_THRU_END_OF(y - 1);
644 yday = days; /* day in the year. Not currently used. */
645 ip = __mon_yday[__isleap(y)];
646 for (y = 11; days < (long int) ip[y]; --y)
650 *dayp = days + 1; /* day in the month */
655 * Read/write the hardware clock.
658 int mac_hwclk(int op, struct rtc_time *t)
662 if (!op) { /* read */
663 switch (macintosh_config->adb_type) {
667 now = via_read_time();
669 #ifdef CONFIG_ADB_CUDA
672 now = cuda_read_time();
675 #ifdef CONFIG_ADB_PMU68K
677 now = pmu_read_time();
686 &t->tm_year, &t->tm_mon, &t->tm_mday,
687 &t->tm_hour, &t->tm_min, &t->tm_sec);
688 pr_debug("%s: read %04d-%02d-%-2d %02d:%02d:%02d\n",
689 __func__, t->tm_year + 1900, t->tm_mon + 1, t->tm_mday,
690 t->tm_hour, t->tm_min, t->tm_sec);
692 pr_debug("%s: tried to write %04d-%02d-%-2d %02d:%02d:%02d\n",
693 __func__, t->tm_year + 1900, t->tm_mon + 1, t->tm_mday,
694 t->tm_hour, t->tm_min, t->tm_sec);
696 now = mktime(t->tm_year + 1900, t->tm_mon + 1, t->tm_mday,
697 t->tm_hour, t->tm_min, t->tm_sec);
699 switch (macintosh_config->adb_type) {
705 #ifdef CONFIG_ADB_CUDA
708 cuda_write_time(now);
711 #ifdef CONFIG_ADB_PMU68K
724 * Set minutes/seconds in the hardware clock
727 int mac_set_clock_mmss (unsigned long nowtime)
732 now.tm_sec = nowtime % 60;
733 now.tm_min = (nowtime / 60) % 60;