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misc.c
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1 /*
2  * Miscellaneous Mac68K-specific stuff
3  */
4 
5 #include <linux/types.h>
6 #include <linux/errno.h>
7 #include <linux/miscdevice.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 <asm/uaccess.h>
20 #include <asm/io.h>
21 #include <asm/rtc.h>
22 #include <asm/segment.h>
23 #include <asm/setup.h>
24 #include <asm/macintosh.h>
25 #include <asm/mac_via.h>
26 #include <asm/mac_oss.h>
27 
28 #define BOOTINFO_COMPAT_1_0
29 #include <asm/bootinfo.h>
30 #include <asm/machdep.h>
31 
32 /* Offset between Unix time (1970-based) and Mac time (1904-based) */
33 
34 #define RTC_OFFSET 2082844800
35 
36 static void (*rom_reset)(void);
37 
38 #ifdef CONFIG_ADB_CUDA
39 static long cuda_read_time(void)
40 {
41  struct adb_request req;
42  long time;
43 
44  if (cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_GET_TIME) < 0)
45  return 0;
46  while (!req.complete)
47  cuda_poll();
48 
49  time = (req.reply[3] << 24) | (req.reply[4] << 16)
50  | (req.reply[5] << 8) | req.reply[6];
51  return time - RTC_OFFSET;
52 }
53 
54 static void cuda_write_time(long data)
55 {
56  struct adb_request req;
57  data += RTC_OFFSET;
59  (data >> 24) & 0xFF, (data >> 16) & 0xFF,
60  (data >> 8) & 0xFF, data & 0xFF) < 0)
61  return;
62  while (!req.complete)
63  cuda_poll();
64 }
65 
66 static __u8 cuda_read_pram(int offset)
67 {
68  struct adb_request req;
70  (offset >> 8) & 0xFF, offset & 0xFF) < 0)
71  return 0;
72  while (!req.complete)
73  cuda_poll();
74  return req.reply[3];
75 }
76 
77 static void cuda_write_pram(int offset, __u8 data)
78 {
79  struct adb_request req;
81  (offset >> 8) & 0xFF, offset & 0xFF, data) < 0)
82  return;
83  while (!req.complete)
84  cuda_poll();
85 }
86 #else
87 #define cuda_read_time() 0
88 #define cuda_write_time(n)
89 #define cuda_read_pram NULL
90 #define cuda_write_pram NULL
91 #endif
92 
93 #ifdef CONFIG_ADB_PMU68K
94 static long pmu_read_time(void)
95 {
96  struct adb_request req;
97  long time;
98 
99  if (pmu_request(&req, NULL, 1, PMU_READ_RTC) < 0)
100  return 0;
101  while (!req.complete)
102  pmu_poll();
103 
104  time = (req.reply[1] << 24) | (req.reply[2] << 16)
105  | (req.reply[3] << 8) | req.reply[4];
106  return time - RTC_OFFSET;
107 }
108 
109 static void pmu_write_time(long data)
110 {
111  struct adb_request req;
112  data += RTC_OFFSET;
113  if (pmu_request(&req, NULL, 5, PMU_SET_RTC,
114  (data >> 24) & 0xFF, (data >> 16) & 0xFF,
115  (data >> 8) & 0xFF, data & 0xFF) < 0)
116  return;
117  while (!req.complete)
118  pmu_poll();
119 }
120 
121 static __u8 pmu_read_pram(int offset)
122 {
123  struct adb_request req;
125  (offset >> 8) & 0xFF, offset & 0xFF) < 0)
126  return 0;
127  while (!req.complete)
128  pmu_poll();
129  return req.reply[3];
130 }
131 
132 static void pmu_write_pram(int offset, __u8 data)
133 {
134  struct adb_request req;
136  (offset >> 8) & 0xFF, offset & 0xFF, data) < 0)
137  return;
138  while (!req.complete)
139  pmu_poll();
140 }
141 #else
142 #define pmu_read_time() 0
143 #define pmu_write_time(n)
144 #define pmu_read_pram NULL
145 #define pmu_write_pram NULL
146 #endif
147 
148 #if 0 /* def CONFIG_ADB_MACIISI */
149 extern int maciisi_request(struct adb_request *req,
150  void (*done)(struct adb_request *), int nbytes, ...);
151 
152 static long maciisi_read_time(void)
153 {
154  struct adb_request req;
155  long time;
156 
158  return 0;
159 
160  time = (req.reply[3] << 24) | (req.reply[4] << 16)
161  | (req.reply[5] << 8) | req.reply[6];
162  return time - RTC_OFFSET;
163 }
164 
165 static void maciisi_write_time(long data)
166 {
167  struct adb_request req;
168  data += RTC_OFFSET;
170  (data >> 24) & 0xFF, (data >> 16) & 0xFF,
171  (data >> 8) & 0xFF, data & 0xFF);
172 }
173 
174 static __u8 maciisi_read_pram(int offset)
175 {
176  struct adb_request req;
178  (offset >> 8) & 0xFF, offset & 0xFF))
179  return 0;
180  return req.reply[3];
181 }
182 
183 static void maciisi_write_pram(int offset, __u8 data)
184 {
185  struct adb_request req;
187  (offset >> 8) & 0xFF, offset & 0xFF, data);
188 }
189 #else
190 #define maciisi_read_time() 0
191 #define maciisi_write_time(n)
192 #define maciisi_read_pram NULL
193 #define maciisi_write_pram NULL
194 #endif
195 
196 /*
197  * VIA PRAM/RTC access routines
198  *
199  * Must be called with interrupts disabled and
200  * the RTC should be enabled.
201  */
202 
203 static __u8 via_pram_readbyte(void)
204 {
205  int i,reg;
206  __u8 data;
207 
208  reg = via1[vBufB] & ~VIA1B_vRTCClk;
209 
210  /* Set the RTC data line to be an input. */
211 
213 
214  /* The bits of the byte come out in MSB order */
215 
216  data = 0;
217  for (i = 0 ; i < 8 ; i++) {
218  via1[vBufB] = reg;
219  via1[vBufB] = reg | VIA1B_vRTCClk;
220  data = (data << 1) | (via1[vBufB] & VIA1B_vRTCData);
221  }
222 
223  /* Return RTC data line to output state */
224 
226 
227  return data;
228 }
229 
230 static void via_pram_writebyte(__u8 data)
231 {
232  int i,reg,bit;
233 
234  reg = via1[vBufB] & ~(VIA1B_vRTCClk | VIA1B_vRTCData);
235 
236  /* The bits of the byte go in in MSB order */
237 
238  for (i = 0 ; i < 8 ; i++) {
239  bit = data & 0x80? 1 : 0;
240  data <<= 1;
241  via1[vBufB] = reg | bit;
242  via1[vBufB] = reg | bit | VIA1B_vRTCClk;
243  }
244 }
245 
246 /*
247  * Execute a VIA PRAM/RTC command. For read commands
248  * data should point to a one-byte buffer for the
249  * resulting data. For write commands it should point
250  * to the data byte to for the command.
251  *
252  * This function disables all interrupts while running.
253  */
254 
255 static void via_pram_command(int command, __u8 *data)
256 {
257  unsigned long flags;
258  int is_read;
259 
260  local_irq_save(flags);
261 
262  /* Enable the RTC and make sure the strobe line is high */
263 
265 
266  if (command & 0xFF00) { /* extended (two-byte) command */
267  via_pram_writebyte((command & 0xFF00) >> 8);
268  via_pram_writebyte(command & 0xFF);
269  is_read = command & 0x8000;
270  } else { /* one-byte command */
271  via_pram_writebyte(command);
272  is_read = command & 0x80;
273  }
274  if (is_read) {
275  *data = via_pram_readbyte();
276  } else {
277  via_pram_writebyte(*data);
278  }
279 
280  /* All done, disable the RTC */
281 
283 
284  local_irq_restore(flags);
285 }
286 
287 static __u8 via_read_pram(int offset)
288 {
289  return 0;
290 }
291 
292 static void via_write_pram(int offset, __u8 data)
293 {
294 }
295 
296 /*
297  * Return the current time in seconds since January 1, 1904.
298  *
299  * This only works on machines with the VIA-based PRAM/RTC, which
300  * is basically any machine with Mac II-style ADB.
301  */
302 
303 static long via_read_time(void)
304 {
305  union {
306  __u8 cdata[4];
307  long idata;
308  } result, last_result;
309  int count = 1;
310 
311  via_pram_command(0x81, &last_result.cdata[3]);
312  via_pram_command(0x85, &last_result.cdata[2]);
313  via_pram_command(0x89, &last_result.cdata[1]);
314  via_pram_command(0x8D, &last_result.cdata[0]);
315 
316  /*
317  * The NetBSD guys say to loop until you get the same reading
318  * twice in a row.
319  */
320 
321  while (1) {
322  via_pram_command(0x81, &result.cdata[3]);
323  via_pram_command(0x85, &result.cdata[2]);
324  via_pram_command(0x89, &result.cdata[1]);
325  via_pram_command(0x8D, &result.cdata[0]);
326 
327  if (result.idata == last_result.idata)
328  return result.idata - RTC_OFFSET;
329 
330  if (++count > 10)
331  break;
332 
333  last_result.idata = result.idata;
334  }
335 
336  pr_err("via_read_time: failed to read a stable value; "
337  "got 0x%08lx then 0x%08lx\n",
338  last_result.idata, result.idata);
339 
340  return 0;
341 }
342 
343 /*
344  * Set the current time to a number of seconds since January 1, 1904.
345  *
346  * This only works on machines with the VIA-based PRAM/RTC, which
347  * is basically any machine with Mac II-style ADB.
348  */
349 
350 static void via_write_time(long time)
351 {
352  union {
353  __u8 cdata[4];
354  long idata;
355  } data;
356  __u8 temp;
357 
358  /* Clear the write protect bit */
359 
360  temp = 0x55;
361  via_pram_command(0x35, &temp);
362 
363  data.idata = time + RTC_OFFSET;
364  via_pram_command(0x01, &data.cdata[3]);
365  via_pram_command(0x05, &data.cdata[2]);
366  via_pram_command(0x09, &data.cdata[1]);
367  via_pram_command(0x0D, &data.cdata[0]);
368 
369  /* Set the write protect bit */
370 
371  temp = 0xD5;
372  via_pram_command(0x35, &temp);
373 }
374 
375 static void via_shutdown(void)
376 {
377  if (rbv_present) {
378  via2[rBufB] &= ~0x04;
379  } else {
380  /* Direction of vDirB is output */
381  via2[vDirB] |= 0x04;
382  /* Send a value of 0 on that line */
383  via2[vBufB] &= ~0x04;
384  mdelay(1000);
385  }
386 }
387 
388 /*
389  * FIXME: not sure how this is supposed to work exactly...
390  */
391 
392 static void oss_shutdown(void)
393 {
394  oss->rom_ctrl = OSS_POWEROFF;
395 }
396 
397 #ifdef CONFIG_ADB_CUDA
398 
399 static void cuda_restart(void)
400 {
401  struct adb_request req;
402  if (cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM) < 0)
403  return;
404  while (!req.complete)
405  cuda_poll();
406 }
407 
408 static void cuda_shutdown(void)
409 {
410  struct adb_request req;
411  if (cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN) < 0)
412  return;
413  while (!req.complete)
414  cuda_poll();
415 }
416 
417 #endif /* CONFIG_ADB_CUDA */
418 
419 #ifdef CONFIG_ADB_PMU68K
420 
421 void pmu_restart(void)
422 {
423  struct adb_request req;
424  if (pmu_request(&req, NULL,
426  return;
427  while (!req.complete)
428  pmu_poll();
429  if (pmu_request(&req, NULL, 1, PMU_RESET) < 0)
430  return;
431  while (!req.complete)
432  pmu_poll();
433 }
434 
435 void pmu_shutdown(void)
436 {
437  struct adb_request req;
438  if (pmu_request(&req, NULL,
440  return;
441  while (!req.complete)
442  pmu_poll();
443  if (pmu_request(&req, NULL, 5, PMU_SHUTDOWN, 'M', 'A', 'T', 'T') < 0)
444  return;
445  while (!req.complete)
446  pmu_poll();
447 }
448 
449 #endif
450 
451 /*
452  *-------------------------------------------------------------------
453  * Below this point are the generic routines; they'll dispatch to the
454  * correct routine for the hardware on which we're running.
455  *-------------------------------------------------------------------
456  */
457 
458 void mac_pram_read(int offset, __u8 *buffer, int len)
459 {
460  __u8 (*func)(int);
461  int i;
462 
463  switch(macintosh_config->adb_type) {
464  case MAC_ADB_IISI:
465  func = maciisi_read_pram; break;
466  case MAC_ADB_PB1:
467  case MAC_ADB_PB2:
468  func = pmu_read_pram; break;
469  case MAC_ADB_CUDA:
470  func = cuda_read_pram; break;
471  default:
472  func = via_read_pram;
473  }
474  if (!func)
475  return;
476  for (i = 0 ; i < len ; i++) {
477  buffer[i] = (*func)(offset++);
478  }
479 }
480 
481 void mac_pram_write(int offset, __u8 *buffer, int len)
482 {
483  void (*func)(int, __u8);
484  int i;
485 
486  switch(macintosh_config->adb_type) {
487  case MAC_ADB_IISI:
488  func = maciisi_write_pram; break;
489  case MAC_ADB_PB1:
490  case MAC_ADB_PB2:
491  func = pmu_write_pram; break;
492  case MAC_ADB_CUDA:
493  func = cuda_write_pram; break;
494  default:
495  func = via_write_pram;
496  }
497  if (!func)
498  return;
499  for (i = 0 ; i < len ; i++) {
500  (*func)(offset++, buffer[i]);
501  }
502 }
503 
504 void mac_poweroff(void)
505 {
506  /*
507  * MAC_ADB_IISI may need to be moved up here if it doesn't actually
508  * work using the ADB packet method. --David Kilzer
509  */
510 
511  if (oss_present) {
512  oss_shutdown();
513  } else if (macintosh_config->adb_type == MAC_ADB_II) {
514  via_shutdown();
515 #ifdef CONFIG_ADB_CUDA
516  } else if (macintosh_config->adb_type == MAC_ADB_CUDA) {
517  cuda_shutdown();
518 #endif
519 #ifdef CONFIG_ADB_PMU68K
520  } else if (macintosh_config->adb_type == MAC_ADB_PB1
521  || macintosh_config->adb_type == MAC_ADB_PB2) {
522  pmu_shutdown();
523 #endif
524  }
526  printk("It is now safe to turn off your Macintosh.\n");
527  while(1);
528 }
529 
530 void mac_reset(void)
531 {
532  if (macintosh_config->adb_type == MAC_ADB_II) {
533  unsigned long flags;
534 
535  /* need ROMBASE in booter */
536  /* indeed, plus need to MAP THE ROM !! */
537 
538  if (mac_bi_data.rombase == 0)
539  mac_bi_data.rombase = 0x40800000;
540 
541  /* works on some */
542  rom_reset = (void *) (mac_bi_data.rombase + 0xa);
543 
544  if (macintosh_config->ident == MAC_MODEL_SE30) {
545  /*
546  * MSch: Machines known to crash on ROM reset ...
547  */
548  } else {
549  local_irq_save(flags);
550 
551  rom_reset();
552 
553  local_irq_restore(flags);
554  }
555 #ifdef CONFIG_ADB_CUDA
556  } else if (macintosh_config->adb_type == MAC_ADB_CUDA) {
557  cuda_restart();
558 #endif
559 #ifdef CONFIG_ADB_PMU68K
560  } else if (macintosh_config->adb_type == MAC_ADB_PB1
561  || macintosh_config->adb_type == MAC_ADB_PB2) {
562  pmu_restart();
563 #endif
564  } else if (CPU_IS_030) {
565 
566  /* 030-specific reset routine. The idea is general, but the
567  * specific registers to reset are '030-specific. Until I
568  * have a non-030 machine, I can't test anything else.
569  * -- C. Scott Ananian <[email protected]>
570  */
571 
572  unsigned long rombase = 0x40000000;
573 
574  /* make a 1-to-1 mapping, using the transparent tran. reg. */
575  unsigned long virt = (unsigned long) mac_reset;
576  unsigned long phys = virt_to_phys(mac_reset);
577  unsigned long addr = (phys&0xFF000000)|0x8777;
578  unsigned long offset = phys-virt;
579  local_irq_disable(); /* lets not screw this up, ok? */
580  __asm__ __volatile__(".chip 68030\n\t"
581  "pmove %0,%/tt0\n\t"
582  ".chip 68k"
583  : : "m" (addr));
584  /* Now jump to physical address so we can disable MMU */
585  __asm__ __volatile__(
586  ".chip 68030\n\t"
587  "lea %/pc@(1f),%/a0\n\t"
588  "addl %0,%/a0\n\t"/* fixup target address and stack ptr */
589  "addl %0,%/sp\n\t"
590  "pflusha\n\t"
591  "jmp %/a0@\n\t" /* jump into physical memory */
592  "0:.long 0\n\t" /* a constant zero. */
593  /* OK. Now reset everything and jump to reset vector. */
594  "1:\n\t"
595  "lea %/pc@(0b),%/a0\n\t"
596  "pmove %/a0@, %/tc\n\t" /* disable mmu */
597  "pmove %/a0@, %/tt0\n\t" /* disable tt0 */
598  "pmove %/a0@, %/tt1\n\t" /* disable tt1 */
599  "movel #0, %/a0\n\t"
600  "movec %/a0, %/vbr\n\t" /* clear vector base register */
601  "movec %/a0, %/cacr\n\t" /* disable caches */
602  "movel #0x0808,%/a0\n\t"
603  "movec %/a0, %/cacr\n\t" /* flush i&d caches */
604  "movew #0x2700,%/sr\n\t" /* set up status register */
605  "movel %1@(0x0),%/a0\n\t"/* load interrupt stack pointer */
606  "movec %/a0, %/isp\n\t"
607  "movel %1@(0x4),%/a0\n\t" /* load reset vector */
608  "reset\n\t" /* reset external devices */
609  "jmp %/a0@\n\t" /* jump to the reset vector */
610  ".chip 68k"
611  : : "r" (offset), "a" (rombase) : "a0");
612  }
613 
614  /* should never get here */
616  printk ("Restart failed. Please restart manually.\n");
617  while(1);
618 }
619 
620 /*
621  * This function translates seconds since 1970 into a proper date.
622  *
623  * Algorithm cribbed from glibc2.1, __offtime().
624  */
625 #define SECS_PER_MINUTE (60)
626 #define SECS_PER_HOUR (SECS_PER_MINUTE * 60)
627 #define SECS_PER_DAY (SECS_PER_HOUR * 24)
628 
629 static void unmktime(unsigned long time, long offset,
630  int *yearp, int *monp, int *dayp,
631  int *hourp, int *minp, int *secp)
632 {
633  /* How many days come before each month (0-12). */
634  static const unsigned short int __mon_yday[2][13] =
635  {
636  /* Normal years. */
637  { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
638  /* Leap years. */
639  { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
640  };
641  long int days, rem, y, wday, yday;
642  const unsigned short int *ip;
643 
644  days = time / SECS_PER_DAY;
645  rem = time % SECS_PER_DAY;
646  rem += offset;
647  while (rem < 0) {
648  rem += SECS_PER_DAY;
649  --days;
650  }
651  while (rem >= SECS_PER_DAY) {
652  rem -= SECS_PER_DAY;
653  ++days;
654  }
655  *hourp = rem / SECS_PER_HOUR;
656  rem %= SECS_PER_HOUR;
657  *minp = rem / SECS_PER_MINUTE;
658  *secp = rem % SECS_PER_MINUTE;
659  /* January 1, 1970 was a Thursday. */
660  wday = (4 + days) % 7; /* Day in the week. Not currently used */
661  if (wday < 0) wday += 7;
662  y = 1970;
663 
664 #define DIV(a, b) ((a) / (b) - ((a) % (b) < 0))
665 #define LEAPS_THRU_END_OF(y) (DIV (y, 4) - DIV (y, 100) + DIV (y, 400))
666 #define __isleap(year) \
667  ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
668 
669  while (days < 0 || days >= (__isleap (y) ? 366 : 365))
670  {
671  /* Guess a corrected year, assuming 365 days per year. */
672  long int yg = y + days / 365 - (days % 365 < 0);
673 
674  /* Adjust DAYS and Y to match the guessed year. */
675  days -= ((yg - y) * 365
676  + LEAPS_THRU_END_OF (yg - 1)
677  - LEAPS_THRU_END_OF (y - 1));
678  y = yg;
679  }
680  *yearp = y - 1900;
681  yday = days; /* day in the year. Not currently used. */
682  ip = __mon_yday[__isleap(y)];
683  for (y = 11; days < (long int) ip[y]; --y)
684  continue;
685  days -= ip[y];
686  *monp = y;
687  *dayp = days + 1; /* day in the month */
688  return;
689 }
690 
691 /*
692  * Read/write the hardware clock.
693  */
694 
695 int mac_hwclk(int op, struct rtc_time *t)
696 {
697  unsigned long now;
698 
699  if (!op) { /* read */
700  switch (macintosh_config->adb_type) {
701  case MAC_ADB_II:
702  case MAC_ADB_IOP:
703  now = via_read_time();
704  break;
705  case MAC_ADB_IISI:
706  now = maciisi_read_time();
707  break;
708  case MAC_ADB_PB1:
709  case MAC_ADB_PB2:
710  now = pmu_read_time();
711  break;
712  case MAC_ADB_CUDA:
713  now = cuda_read_time();
714  break;
715  default:
716  now = 0;
717  }
718 
719  t->tm_wday = 0;
720  unmktime(now, 0,
721  &t->tm_year, &t->tm_mon, &t->tm_mday,
722  &t->tm_hour, &t->tm_min, &t->tm_sec);
723 #if 0
724  printk("mac_hwclk: read %04d-%02d-%-2d %02d:%02d:%02d\n",
725  t->tm_year + 1900, t->tm_mon + 1, t->tm_mday,
726  t->tm_hour, t->tm_min, t->tm_sec);
727 #endif
728  } else { /* write */
729 #if 0
730  printk("mac_hwclk: tried to write %04d-%02d-%-2d %02d:%02d:%02d\n",
731  t->tm_year + 1900, t->tm_mon + 1, t->tm_mday,
732  t->tm_hour, t->tm_min, t->tm_sec);
733 #endif
734 
735  now = mktime(t->tm_year + 1900, t->tm_mon + 1, t->tm_mday,
736  t->tm_hour, t->tm_min, t->tm_sec);
737 
738  switch (macintosh_config->adb_type) {
739  case MAC_ADB_II:
740  case MAC_ADB_IOP:
741  via_write_time(now);
742  break;
743  case MAC_ADB_CUDA:
744  cuda_write_time(now);
745  break;
746  case MAC_ADB_PB1:
747  case MAC_ADB_PB2:
748  pmu_write_time(now);
749  break;
750  case MAC_ADB_IISI:
751  maciisi_write_time(now);
752  }
753  }
754  return 0;
755 }
756 
757 /*
758  * Set minutes/seconds in the hardware clock
759  */
760 
761 int mac_set_clock_mmss (unsigned long nowtime)
762 {
763  struct rtc_time now;
764 
765  mac_hwclk(0, &now);
766  now.tm_sec = nowtime % 60;
767  now.tm_min = (nowtime / 60) % 60;
768  mac_hwclk(1, &now);
769 
770  return 0;
771 }