25 |
* SUCH DAMAGE. |
* SUCH DAMAGE. |
26 |
* |
* |
27 |
* |
* |
28 |
* $Id: dev_mc146818.c,v 1.75 2005/10/09 22:21:31 debug Exp $ |
* $Id: dev_mc146818.c,v 1.80 2005/11/20 11:28:45 debug Exp $ |
29 |
* |
* |
30 |
* MC146818 real-time clock, used by many different machines types. |
* MC146818 real-time clock, used by many different machines types. |
31 |
* (DS1687 as used in some other machines is also similar to the MC146818.) |
* (DS1687 as used in some other machines is also similar to the MC146818.) |
53 |
|
|
54 |
|
|
55 |
#define to_bcd(x) ( ((x)/10) * 16 + ((x)%10) ) |
#define to_bcd(x) ( ((x)/10) * 16 + ((x)%10) ) |
56 |
|
#define from_bcd(x) ( ((x)>>4) * 10 + ((x)&15) ) |
57 |
|
|
58 |
/* #define MC146818_DEBUG */ |
/* #define MC146818_DEBUG */ |
59 |
|
|
77 |
int irq_nr; |
int irq_nr; |
78 |
|
|
79 |
int previous_second; |
int previous_second; |
80 |
|
int n_seconds_elapsed; |
81 |
|
int uip_threshold; |
82 |
|
|
83 |
int interrupt_every_x_cycles; |
int interrupt_every_x_cycles; |
84 |
int cycles_left_until_interrupt; |
int cycles_left_until_interrupt; |
85 |
|
|
86 |
|
int ugly_netbsd_prep_hack_done; |
87 |
|
int ugly_netbsd_prep_hack_sec; |
88 |
}; |
}; |
89 |
|
|
90 |
|
|
91 |
/* |
/* |
92 |
|
* Ugly hack to fool NetBSD/prep to accept the clock. (See mcclock_isa_match |
93 |
|
* in NetBSD's arch/prep/isa/mcclock_isa.c for details.) |
94 |
|
*/ |
95 |
|
#define NETBSD_HACK_INIT 0 |
96 |
|
#define NETBSD_HACK_FIRST_1 1 |
97 |
|
#define NETBSD_HACK_FIRST_2 2 |
98 |
|
#define NETBSD_HACK_SECOND_1 3 |
99 |
|
#define NETBSD_HACK_SECOND_2 4 |
100 |
|
#define NETBSD_HACK_DONE 5 |
101 |
|
|
102 |
|
|
103 |
|
/* |
104 |
* recalc_interrupt_cycle(): |
* recalc_interrupt_cycle(): |
105 |
* |
* |
106 |
* If automatic_clock_adjustment is turned on, then emulated_hz is modified |
* If automatic_clock_adjustment is turned on, then emulated_hz is modified |
151 |
{ |
{ |
152 |
struct mc_data *d = extra; |
struct mc_data *d = extra; |
153 |
|
|
|
if (d == NULL) |
|
|
return; |
|
|
|
|
154 |
recalc_interrupt_cycle(cpu, d); |
recalc_interrupt_cycle(cpu, d); |
155 |
|
|
156 |
if ((d->reg[MC_REGB * 4] & MC_REGB_PIE) && |
if ((d->reg[MC_REGB * 4] & MC_REGB_PIE) && |
241 |
* Special hacks for emulating the behaviour of various machines: |
* Special hacks for emulating the behaviour of various machines: |
242 |
*/ |
*/ |
243 |
switch (d->access_style) { |
switch (d->access_style) { |
244 |
|
case MC146818_ALGOR: |
245 |
|
d->reg[4 * MC_YEAR] += 80; |
246 |
|
break; |
247 |
case MC146818_ARC_NEC: |
case MC146818_ARC_NEC: |
248 |
d->reg[4 * MC_YEAR] += (0x18 - 104); |
d->reg[4 * MC_YEAR] += (0x18 - 104); |
249 |
break; |
break; |
325 |
|
|
326 |
/* Different ways of accessing the registers: */ |
/* Different ways of accessing the registers: */ |
327 |
switch (d->access_style) { |
switch (d->access_style) { |
328 |
|
case MC146818_ALGOR: |
329 |
case MC146818_CATS: |
case MC146818_CATS: |
330 |
case MC146818_PC_CMOS: |
case MC146818_PC_CMOS: |
331 |
if ((relative_addr & 1) == 0x00) { |
if ((relative_addr & 1) == 0x00) { |
370 |
* should be ignored. It works _almost_ as DEC, if offsets are |
* should be ignored. It works _almost_ as DEC, if offsets are |
371 |
* divided by 0x40. |
* divided by 0x40. |
372 |
*/ |
*/ |
373 |
|
break; |
374 |
|
case MC146818_PMPPC: |
375 |
|
relative_addr *= 4; |
376 |
|
break; |
377 |
default: |
default: |
378 |
; |
; |
379 |
} |
} |
383 |
fatal("[ mc146818: write to addr=0x%04x (len %i): ", |
fatal("[ mc146818: write to addr=0x%04x (len %i): ", |
384 |
(int)relative_addr, (int)len); |
(int)relative_addr, (int)len); |
385 |
for (i=0; i<len; i++) |
for (i=0; i<len; i++) |
386 |
fatal("%02x ", data[i]); |
fatal("0x%02x ", data[i]); |
387 |
fatal("]\n"); |
fatal("]\n"); |
388 |
} |
} |
389 |
#endif |
#endif |
396 |
* Linux on at least sgimips and evbmips (Malta) wants the UIP bit |
* Linux on at least sgimips and evbmips (Malta) wants the UIP bit |
397 |
* in REGA to be updated once a second. |
* in REGA to be updated once a second. |
398 |
*/ |
*/ |
399 |
timet = time(NULL); |
if (relative_addr == MC_REGA*4 || relative_addr == MC_REGC*4) { |
400 |
tmp = gmtime(&timet); |
timet = time(NULL); |
401 |
d->reg[MC_REGC * 4] &= ~MC_REGC_UF; |
tmp = gmtime(&timet); |
402 |
|
d->reg[MC_REGC * 4] &= ~MC_REGC_UF; |
403 |
|
if (tmp->tm_sec != d->previous_second) { |
404 |
|
d->n_seconds_elapsed ++; |
405 |
|
d->previous_second = tmp->tm_sec; |
406 |
|
} |
407 |
|
if (d->n_seconds_elapsed > d->uip_threshold) { |
408 |
|
d->n_seconds_elapsed = 0; |
409 |
|
|
410 |
if (tmp->tm_sec != d->previous_second) { |
d->reg[MC_REGA * 4] |= MC_REGA_UIP; |
|
d->reg[MC_REGA * 4] &= ~MC_REGA_UIP; |
|
411 |
|
|
412 |
d->reg[MC_REGC * 4] |= MC_REGC_UF; |
d->reg[MC_REGC * 4] |= MC_REGC_UF; |
413 |
d->reg[MC_REGC * 4] |= MC_REGC_IRQF; |
d->reg[MC_REGC * 4] |= MC_REGC_IRQF; |
|
d->previous_second = tmp->tm_sec; |
|
414 |
|
|
415 |
/* For some reason, some Linux/DECstation KN04 kernels want |
/* For some reason, some Linux/DECstation KN04 |
416 |
the PF (periodic flag) bit set, even though interrupts |
kernels want the PF (periodic flag) bit set, |
417 |
are not enabled? */ |
even though interrupts are not enabled? */ |
418 |
d->reg[MC_REGC * 4] |= MC_REGC_PF; |
d->reg[MC_REGC * 4] |= MC_REGC_PF; |
419 |
} else |
} else |
420 |
d->reg[MC_REGA * 4] |= MC_REGA_UIP; |
d->reg[MC_REGA * 4] &= ~MC_REGA_UIP; |
421 |
|
} |
422 |
|
|
423 |
/* RTC data is in either BCD format or binary: */ |
/* RTC data is in either BCD format or binary: */ |
424 |
if (d->use_bcd) |
if (d->use_bcd) |
468 |
case MC_RATE_8_Hz: d->interrupt_hz = 8; break; |
case MC_RATE_8_Hz: d->interrupt_hz = 8; break; |
469 |
case MC_RATE_4_Hz: d->interrupt_hz = 4; break; |
case MC_RATE_4_Hz: d->interrupt_hz = 4; break; |
470 |
case MC_RATE_2_Hz: d->interrupt_hz = 2; break; |
case MC_RATE_2_Hz: d->interrupt_hz = 2; break; |
471 |
default: |
default:/* debug("[ mc146818: unimplemented " |
|
/* debug("[ mc146818: unimplemented " |
|
472 |
"MC_REGA RS: %i ]\n", |
"MC_REGA RS: %i ]\n", |
473 |
data[0] & MC_REGA_RSMASK); */ |
data[0] & MC_REGA_RSMASK); */ |
474 |
; |
; |
534 |
case 0x15: |
case 0x15: |
535 |
break; |
break; |
536 |
case 4 * MC_SEC: |
case 4 * MC_SEC: |
537 |
|
if (d->ugly_netbsd_prep_hack_done < NETBSD_HACK_DONE) { |
538 |
|
d->ugly_netbsd_prep_hack_done ++; |
539 |
|
switch (d->ugly_netbsd_prep_hack_done) { |
540 |
|
case NETBSD_HACK_FIRST_1: |
541 |
|
d->ugly_netbsd_prep_hack_sec = |
542 |
|
from_bcd(d->reg[relative_addr]); |
543 |
|
break; |
544 |
|
case NETBSD_HACK_FIRST_2: |
545 |
|
d->reg[relative_addr] = to_bcd( |
546 |
|
d->ugly_netbsd_prep_hack_sec); |
547 |
|
break; |
548 |
|
case NETBSD_HACK_SECOND_1: |
549 |
|
case NETBSD_HACK_SECOND_2: |
550 |
|
d->reg[relative_addr] = to_bcd((1 + |
551 |
|
d->ugly_netbsd_prep_hack_sec) % 60); |
552 |
|
break; |
553 |
|
} |
554 |
|
} |
555 |
case 4 * MC_MIN: |
case 4 * MC_MIN: |
556 |
case 4 * MC_HOUR: |
case 4 * MC_HOUR: |
557 |
case 4 * MC_DOW: |
case 4 * MC_DOW: |
568 |
if (d->reg[MC_REGB * 4] & MC_REGB_SET) |
if (d->reg[MC_REGB * 4] & MC_REGB_SET) |
569 |
break; |
break; |
570 |
|
|
571 |
mc146818_update_time(d); |
if (d->ugly_netbsd_prep_hack_done >= NETBSD_HACK_DONE) |
572 |
|
mc146818_update_time(d); |
573 |
|
break; |
574 |
|
case 4 * MC_REGA: |
575 |
break; |
break; |
576 |
case 4 * MC_REGC: /* Interrupt ack. */ |
case 4 * MC_REGC: /* Interrupt ack. */ |
577 |
/* NOTE: Acking is done below, _after_ the |
/* NOTE: Acking is done below, _after_ the |
578 |
register has been read. */ |
register has been read. */ |
579 |
break; |
break; |
580 |
default: |
default:debug("[ mc146818: read from relative_addr = " |
|
debug("[ mc146818: read from relative_addr = " |
|
581 |
"%04x ]\n", (int)relative_addr); |
"%04x ]\n", (int)relative_addr); |
|
; |
|
582 |
} |
} |
583 |
|
|
584 |
data[0] = d->reg[relative_addr]; |
data[0] = d->reg[relative_addr]; |
596 |
fatal("[ mc146818: read from addr=0x%04x (len %i): ", |
fatal("[ mc146818: read from addr=0x%04x (len %i): ", |
597 |
(int)relative_addr, (int)len); |
(int)relative_addr, (int)len); |
598 |
for (i=0; i<len; i++) |
for (i=0; i<len; i++) |
599 |
fatal("%02x ", data[i]); |
fatal("0x%02x ", data[i]); |
600 |
fatal("]\n"); |
fatal("]\n"); |
601 |
} |
} |
602 |
#endif |
#endif |
629 |
d->access_style = access_style; |
d->access_style = access_style; |
630 |
d->addrdiv = addrdiv; |
d->addrdiv = addrdiv; |
631 |
|
|
|
/* Only SGIs and PCs use BCD format (?) */ |
|
632 |
d->use_bcd = 0; |
d->use_bcd = 0; |
633 |
if (access_style == MC146818_SGI || access_style == MC146818_PC_CMOS) |
switch (access_style) { |
634 |
|
case MC146818_SGI: |
635 |
|
case MC146818_PC_CMOS: |
636 |
|
case MC146818_PMPPC: |
637 |
d->use_bcd = 1; |
d->use_bcd = 1; |
638 |
|
} |
639 |
|
|
640 |
|
if (machine->machine_type != MACHINE_PREP) { |
641 |
|
/* NetBSD/prep has a really ugly clock detection code; |
642 |
|
all other machines/OSes don't need this. */ |
643 |
|
d->ugly_netbsd_prep_hack_done = NETBSD_HACK_DONE; |
644 |
|
} |
645 |
|
|
646 |
if (access_style == MC146818_DEC) { |
if (access_style == MC146818_DEC) { |
647 |
/* Station Ethernet Address, on DECstation 3100: */ |
/* Station Ethernet Address, on DECstation 3100: */ |
681 |
d->reg[0xf8] = 1; |
d->reg[0xf8] = 1; |
682 |
} |
} |
683 |
|
|
684 |
|
/* |
685 |
|
* uip_threshold should ideally be 1, but when Linux polls the UIP bit |
686 |
|
* it looses speed. This hack gives Linux the impression that the cpu |
687 |
|
* is uip_threshold times faster than the slow clock it would |
688 |
|
* otherwise detect. |
689 |
|
* |
690 |
|
* TODO: Find out if this messes up Sprite emulation; if so, then |
691 |
|
* this hack has to be removed. |
692 |
|
*/ |
693 |
|
d->uip_threshold = 5; |
694 |
|
|
695 |
if (access_style == MC146818_ARC_JAZZ) |
if (access_style == MC146818_ARC_JAZZ) |
696 |
memory_device_register(mem, "mc146818_jazz", 0x90000070ULL, |
memory_device_register(mem, "mc146818_jazz", 0x90000070ULL, |
697 |
1, dev_mc146818_jazz_access, d, MEM_DEFAULT, NULL); |
1, dev_mc146818_jazz_access, d, DM_DEFAULT, NULL); |
698 |
|
|
699 |
dev_len = DEV_MC146818_LENGTH; |
dev_len = DEV_MC146818_LENGTH; |
700 |
switch (access_style) { |
switch (access_style) { |
708 |
|
|
709 |
memory_device_register(mem, "mc146818", baseaddr, |
memory_device_register(mem, "mc146818", baseaddr, |
710 |
dev_len * addrdiv, dev_mc146818_access, |
dev_len * addrdiv, dev_mc146818_access, |
711 |
d, MEM_DEFAULT, NULL); |
d, DM_DEFAULT, NULL); |
712 |
|
|
713 |
mc146818_update_time(d); |
mc146818_update_time(d); |
714 |
|
|