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
cuda_read_time(void)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 
cuda_write_time(long data)54 static void cuda_write_time(long data)
55 {
56 	struct adb_request req;
57 	data += RTC_OFFSET;
58 	if (cuda_request(&req, NULL, 6, CUDA_PACKET, CUDA_SET_TIME,
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 
cuda_read_pram(int offset)66 static __u8 cuda_read_pram(int offset)
67 {
68 	struct adb_request req;
69 	if (cuda_request(&req, NULL, 4, CUDA_PACKET, CUDA_GET_PRAM,
70 			(offset >> 8) & 0xFF, offset & 0xFF) < 0)
71 		return 0;
72 	while (!req.complete)
73 		cuda_poll();
74 	return req.reply[3];
75 }
76 
cuda_write_pram(int offset,__u8 data)77 static void cuda_write_pram(int offset, __u8 data)
78 {
79 	struct adb_request req;
80 	if (cuda_request(&req, NULL, 5, CUDA_PACKET, CUDA_SET_PRAM,
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
pmu_read_time(void)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 
pmu_write_time(long data)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 
pmu_read_pram(int offset)121 static __u8 pmu_read_pram(int offset)
122 {
123 	struct adb_request req;
124 	if (pmu_request(&req, NULL, 3, PMU_READ_NVRAM,
125 			(offset >> 8) & 0xFF, offset & 0xFF) < 0)
126 		return 0;
127 	while (!req.complete)
128 		pmu_poll();
129 	return req.reply[3];
130 }
131 
pmu_write_pram(int offset,__u8 data)132 static void pmu_write_pram(int offset, __u8 data)
133 {
134 	struct adb_request req;
135 	if (pmu_request(&req, NULL, 4, PMU_WRITE_NVRAM,
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 
157 	if (maciisi_request(&req, NULL, 2, CUDA_PACKET, CUDA_GET_TIME))
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;
169 	maciisi_request(&req, NULL, 6, CUDA_PACKET, CUDA_SET_TIME,
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;
177 	if (maciisi_request(&req, NULL, 4, CUDA_PACKET, CUDA_GET_PRAM,
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;
186 	maciisi_request(&req, NULL, 5, CUDA_PACKET, CUDA_SET_PRAM,
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 
via_pram_readbyte(void)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 
212 	via1[vDirB] &= ~VIA1B_vRTCData;
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 
225 	via1[vDirB] |= VIA1B_vRTCData;
226 
227 	return data;
228 }
229 
via_pram_writebyte(__u8 data)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 
via_pram_command(int command,__u8 * data)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 
264 	via1[vBufB] = (via1[vBufB] | VIA1B_vRTCClk) & ~VIA1B_vRTCEnb;
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 
282 	via1[vBufB] |= VIA1B_vRTCEnb;
283 
284 	local_irq_restore(flags);
285 }
286 
via_read_pram(int offset)287 static __u8 via_read_pram(int offset)
288 {
289 	return 0;
290 }
291 
via_write_pram(int offset,__u8 data)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 
via_read_time(void)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 
via_write_time(long time)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 
via_shutdown(void)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 
oss_shutdown(void)392 static void oss_shutdown(void)
393 {
394 	oss->rom_ctrl = OSS_POWEROFF;
395 }
396 
397 #ifdef CONFIG_ADB_CUDA
398 
cuda_restart(void)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 
cuda_shutdown(void)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 
pmu_restart(void)421 void pmu_restart(void)
422 {
423 	struct adb_request req;
424 	if (pmu_request(&req, NULL,
425 			2, PMU_SET_INTR_MASK, PMU_INT_ADB|PMU_INT_TICK) < 0)
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 
pmu_shutdown(void)435 void pmu_shutdown(void)
436 {
437 	struct adb_request req;
438 	if (pmu_request(&req, NULL,
439 			2, PMU_SET_INTR_MASK, PMU_INT_ADB|PMU_INT_TICK) < 0)
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 
mac_pram_read(int offset,__u8 * buffer,int len)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 
mac_pram_write(int offset,__u8 * buffer,int len)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 
mac_poweroff(void)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 	}
525 	local_irq_enable();
526 	printk("It is now safe to turn off your Macintosh.\n");
527 	while(1);
528 }
529 
mac_reset(void)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 <cananian@alumni.princeton.edu>
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 */
615 	local_irq_enable();
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 
unmktime(unsigned long time,long offset,int * yearp,int * monp,int * dayp,int * hourp,int * minp,int * secp)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 
mac_hwclk(int op,struct rtc_time * t)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 
mac_set_clock_mmss(unsigned long nowtime)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 }
772