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/setup.h>
22 #include <asm/macintosh.h>
23 #include <asm/mac_via.h>
24 #include <asm/mac_oss.h>
26 #include <asm/machdep.h>
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.
34 #define RTC_OFFSET 2082844800
36 static void (*rom_reset)(void);
38 #if IS_ENABLED(CONFIG_NVRAM)
39 #ifdef CONFIG_ADB_CUDA
40 static unsigned char cuda_pram_read_byte(int offset)
42 struct adb_request req;
44 if (cuda_request(&req, NULL, 4, CUDA_PACKET, CUDA_GET_PRAM,
45 (offset >> 8) & 0xFF, offset & 0xFF) < 0)
52 static void cuda_pram_write_byte(unsigned char data, int offset)
54 struct adb_request req;
56 if (cuda_request(&req, NULL, 5, CUDA_PACKET, CUDA_SET_PRAM,
57 (offset >> 8) & 0xFF, offset & 0xFF, data) < 0)
62 #endif /* CONFIG_ADB_CUDA */
65 static unsigned char pmu_pram_read_byte(int offset)
67 struct adb_request req;
69 if (pmu_request(&req, NULL, 3, PMU_READ_XPRAM,
70 offset & 0xFF, 1) < 0)
72 pmu_wait_complete(&req);
77 static void pmu_pram_write_byte(unsigned char data, int offset)
79 struct adb_request req;
81 if (pmu_request(&req, NULL, 4, PMU_WRITE_XPRAM,
82 offset & 0xFF, 1, data) < 0)
84 pmu_wait_complete(&req);
86 #endif /* CONFIG_ADB_PMU */
87 #endif /* CONFIG_NVRAM */
90 * VIA PRAM/RTC access routines
92 * Must be called with interrupts disabled and
93 * the RTC should be enabled.
96 static __u8 via_rtc_recv(void)
101 reg = via1[vBufB] & ~VIA1B_vRTCClk;
103 /* Set the RTC data line to be an input. */
105 via1[vDirB] &= ~VIA1B_vRTCData;
107 /* The bits of the byte come out in MSB order */
110 for (i = 0 ; i < 8 ; i++) {
112 via1[vBufB] = reg | VIA1B_vRTCClk;
113 data = (data << 1) | (via1[vBufB] & VIA1B_vRTCData);
116 /* Return RTC data line to output state */
118 via1[vDirB] |= VIA1B_vRTCData;
123 static void via_rtc_send(__u8 data)
127 reg = via1[vBufB] & ~(VIA1B_vRTCClk | VIA1B_vRTCData);
129 /* The bits of the byte go in in MSB order */
131 for (i = 0 ; i < 8 ; i++) {
132 bit = data & 0x80? 1 : 0;
134 via1[vBufB] = reg | bit;
135 via1[vBufB] = reg | bit | VIA1B_vRTCClk;
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.
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
155 * Inside Mac has no information about two-byte RTC commands but
156 * the MAME/MESS source code has the essentials.
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))
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.
170 * This function disables all interrupts while running.
173 static void via_rtc_command(int command, __u8 *data)
178 local_irq_save(flags);
180 /* The least significant bits must be 0b01 according to Inside Mac */
182 command = (command & ~3) | 1;
184 /* Enable the RTC and make sure the strobe line is high */
186 via1[vBufB] = (via1[vBufB] | VIA1B_vRTCClk) & ~VIA1B_vRTCEnb;
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;
197 *data = via_rtc_recv();
202 /* All done, disable the RTC */
204 via1[vBufB] |= VIA1B_vRTCEnb;
206 local_irq_restore(flags);
209 #if IS_ENABLED(CONFIG_NVRAM)
210 static unsigned char via_pram_read_byte(int offset)
214 via_rtc_command(RTC_CMD_XPRAM_READ | RTC_CMD_XPRAM_ARG(offset), &temp);
219 static void via_pram_write_byte(unsigned char data, int offset)
224 via_rtc_command(RTC_CMD_WRITE(RTC_REG_WRITE_PROTECT), &temp);
227 via_rtc_command(RTC_CMD_XPRAM_WRITE | RTC_CMD_XPRAM_ARG(offset), &temp);
229 temp = 0x55 | RTC_FLG_WRITE_PROTECT;
230 via_rtc_command(RTC_CMD_WRITE(RTC_REG_WRITE_PROTECT), &temp);
232 #endif /* CONFIG_NVRAM */
235 * Return the current time in seconds since January 1, 1904.
237 * This only works on machines with the VIA-based PRAM/RTC, which
238 * is basically any machine with Mac II-style ADB.
241 static time64_t via_read_time(void)
246 } result, last_result;
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]);
255 * The NetBSD guys say to loop until you get the same reading
260 via_rtc_command(RTC_CMD_READ(RTC_REG_SECONDS_0),
262 via_rtc_command(RTC_CMD_READ(RTC_REG_SECONDS_1),
264 via_rtc_command(RTC_CMD_READ(RTC_REG_SECONDS_2),
266 via_rtc_command(RTC_CMD_READ(RTC_REG_SECONDS_3),
269 if (result.idata == last_result.idata)
270 return (time64_t)result.idata - RTC_OFFSET;
275 last_result.idata = result.idata;
278 pr_err("%s: failed to read a stable value; got 0x%08x then 0x%08x\n",
279 __func__, last_result.idata, result.idata);
285 * Set the current time to a number of seconds since January 1, 1904.
287 * This only works on machines with the VIA-based PRAM/RTC, which
288 * is basically any machine with Mac II-style ADB.
291 static void via_set_rtc_time(struct rtc_time *tm)
300 time = mktime64(tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
301 tm->tm_hour, tm->tm_min, tm->tm_sec);
303 /* Clear the write protect bit */
306 via_rtc_command(RTC_CMD_WRITE(RTC_REG_WRITE_PROTECT), &temp);
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]);
314 /* Set the write protect bit */
316 temp = 0x55 | RTC_FLG_WRITE_PROTECT;
317 via_rtc_command(RTC_CMD_WRITE(RTC_REG_WRITE_PROTECT), &temp);
320 static void via_shutdown(void)
323 via2[rBufB] &= ~0x04;
325 /* Direction of vDirB is output */
327 /* Send a value of 0 on that line */
328 via2[vBufB] &= ~0x04;
333 static void oss_shutdown(void)
335 oss->rom_ctrl = OSS_POWEROFF;
338 #ifdef CONFIG_ADB_CUDA
339 static void cuda_restart(void)
341 struct adb_request req;
343 if (cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM) < 0)
345 while (!req.complete)
349 static void cuda_shutdown(void)
351 struct adb_request req;
353 if (cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN) < 0)
356 /* Avoid infinite polling loop when PSU is not under Cuda control */
357 switch (macintosh_config->ident) {
360 case MAC_MODEL_Q605_ACC:
362 case MAC_MODEL_P475F:
366 while (!req.complete)
369 #endif /* CONFIG_ADB_CUDA */
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 *-------------------------------------------------------------------
378 #if IS_ENABLED(CONFIG_NVRAM)
379 unsigned char mac_pram_read_byte(int addr)
381 switch (macintosh_config->adb_type) {
385 return via_pram_read_byte(addr);
386 #ifdef CONFIG_ADB_CUDA
389 return cuda_pram_read_byte(addr);
391 #ifdef CONFIG_ADB_PMU
393 return pmu_pram_read_byte(addr);
400 void mac_pram_write_byte(unsigned char val, int addr)
402 switch (macintosh_config->adb_type) {
406 via_pram_write_byte(val, addr);
408 #ifdef CONFIG_ADB_CUDA
411 cuda_pram_write_byte(val, addr);
414 #ifdef CONFIG_ADB_PMU
416 pmu_pram_write_byte(val, addr);
424 ssize_t mac_pram_get_size(void)
428 #endif /* CONFIG_NVRAM */
430 void mac_poweroff(void)
434 } else if (macintosh_config->adb_type == MAC_ADB_II) {
436 #ifdef CONFIG_ADB_CUDA
437 } else if (macintosh_config->adb_type == MAC_ADB_EGRET ||
438 macintosh_config->adb_type == MAC_ADB_CUDA) {
441 #ifdef CONFIG_ADB_PMU
442 } else if (macintosh_config->adb_type == MAC_ADB_PB2) {
447 pr_crit("It is now safe to turn off your Macintosh.\n");
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 !! */
459 if (mac_bi_data.rombase == 0)
460 mac_bi_data.rombase = 0x40800000;
463 rom_reset = (void *) (mac_bi_data.rombase + 0xa);
467 #ifdef CONFIG_ADB_CUDA
468 } else if (macintosh_config->adb_type == MAC_ADB_EGRET ||
469 macintosh_config->adb_type == MAC_ADB_CUDA) {
472 #ifdef CONFIG_ADB_PMU
473 } else if (macintosh_config->adb_type == MAC_ADB_PB2) {
476 } else if (CPU_IS_030) {
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>
484 unsigned long rombase = 0x40000000;
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;
492 local_irq_disable(); /* lets not screw this up, ok? */
493 __asm__ __volatile__(".chip 68030\n\t"
497 /* Now jump to physical address so we can disable MMU */
498 __asm__ __volatile__(
500 "lea %/pc@(1f),%/a0\n\t"
501 "addl %0,%/a0\n\t"/* fixup target address and stack ptr */
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. */
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 */
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 */
524 : : "r" (offset), "a" (rombase) : "a0");
527 /* should never get here */
528 pr_crit("Restart failed. Please restart manually.\n");
534 * This function translates seconds since 1970 into a proper date.
536 * Algorithm cribbed from glibc2.1, __offtime().
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.
541 #define SECS_PER_MINUTE (60)
542 #define SECS_PER_HOUR (SECS_PER_MINUTE * 60)
543 #define SECS_PER_DAY (SECS_PER_HOUR * 24)
545 static void unmktime(time64_t time, long offset,
546 int *yearp, int *monp, int *dayp,
547 int *hourp, int *minp, int *secp)
549 /* How many days come before each month (0-12). */
550 static const unsigned short int __mon_yday[2][13] =
553 { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
555 { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
557 int days, rem, y, wday, yday;
558 const unsigned short int *ip;
560 days = div_u64_rem(time, SECS_PER_DAY, &rem);
566 while (rem >= SECS_PER_DAY) {
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;
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))
584 while (days < 0 || days >= (__isleap (y) ? 366 : 365))
586 /* Guess a corrected year, assuming 365 days per year. */
587 long int yg = y + days / 365 - (days % 365 < 0);
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);
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)
601 *dayp = days + 1; /* day in the month */
606 * Read/write the hardware clock.
609 int mac_hwclk(int op, struct rtc_time *t)
613 if (!op) { /* read */
614 switch (macintosh_config->adb_type) {
618 now = via_read_time();
620 #ifdef CONFIG_ADB_CUDA
623 now = cuda_get_time();
626 #ifdef CONFIG_ADB_PMU
628 now = pmu_get_time();
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);
641 pr_debug("%s: tried to write %ptR\n", __func__, t);
643 switch (macintosh_config->adb_type) {
649 #ifdef CONFIG_ADB_CUDA
652 cuda_set_rtc_time(t);
655 #ifdef CONFIG_ADB_PMU