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/* |
/* |
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* Copyright (C) 2003-2005 Anders Gavare. All rights reserved. |
* Copyright (C) 2003-2006 Anders Gavare. All rights reserved. |
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* |
* |
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* Redistribution and use in source and binary forms, with or without |
* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are met: |
* modification, are permitted provided that the following conditions are met: |
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* SUCH DAMAGE. |
* SUCH DAMAGE. |
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* |
* |
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* |
* |
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* $Id: dev_mc146818.c,v 1.72 2005/08/02 07:56:37 debug Exp $ |
* $Id: dev_mc146818.c,v 1.84 2006/01/17 05:55:53 debug Exp $ |
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* |
* |
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* MC146818 real-time clock, used by many different machines types. |
* MC146818 real-time clock, used by many different machines types. |
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* (DS1687 as used in some SGI machines is similar to MC146818.) |
* (DS1687 as used in some other machines is also similar to the MC146818.) |
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* |
* |
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* This device contains Date/time, the machine's ethernet address (on |
* This device contains Date/time, the machine's ethernet address (on |
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* DECstation 3100), and can cause periodic (hardware) interrupts. |
* DECstation 3100), and can cause periodic (hardware) interrupts. |
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#define to_bcd(x) ( ((x)/10) * 16 + ((x)%10) ) |
#define to_bcd(x) ( ((x)/10) * 16 + ((x)%10) ) |
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#define from_bcd(x) ( ((x)>>4) * 10 + ((x)&15) ) |
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/* #define MC146818_DEBUG */ |
/* #define MC146818_DEBUG */ |
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int irq_nr; |
int irq_nr; |
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int previous_second; |
int previous_second; |
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int n_seconds_elapsed; |
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int uip_threshold; |
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int interrupt_every_x_cycles; |
int interrupt_every_x_cycles; |
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int cycles_left_until_interrupt; |
int cycles_left_until_interrupt; |
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int ugly_netbsd_prep_hack_done; |
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int ugly_netbsd_prep_hack_sec; |
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}; |
}; |
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/* |
/* |
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* Ugly hack to fool NetBSD/prep to accept the clock. (See mcclock_isa_match |
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* in NetBSD's arch/prep/isa/mcclock_isa.c for details.) |
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*/ |
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#define NETBSD_HACK_INIT 0 |
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#define NETBSD_HACK_FIRST_1 1 |
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#define NETBSD_HACK_FIRST_2 2 |
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#define NETBSD_HACK_SECOND_1 3 |
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#define NETBSD_HACK_SECOND_2 4 |
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#define NETBSD_HACK_DONE 5 |
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/* |
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* recalc_interrupt_cycle(): |
* recalc_interrupt_cycle(): |
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* |
* |
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* If automatic_clock_adjustment is turned on, then emulated_hz is modified |
* If automatic_clock_adjustment is turned on, then emulated_hz is modified |
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{ |
{ |
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struct mc_data *d = extra; |
struct mc_data *d = extra; |
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if (d == NULL) |
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return; |
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recalc_interrupt_cycle(cpu, d); |
recalc_interrupt_cycle(cpu, d); |
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if ((d->reg[MC_REGB * 4] & MC_REGB_PIE) && |
if ((d->reg[MC_REGB * 4] & MC_REGB_PIE) && |
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d->reg[4 * MC_MONTH] = tmp->tm_mon + 1; |
d->reg[4 * MC_MONTH] = tmp->tm_mon + 1; |
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d->reg[4 * MC_YEAR] = tmp->tm_year; |
d->reg[4 * MC_YEAR] = tmp->tm_year; |
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/* |
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* Special hacks for emulating the behaviour of various machines: |
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*/ |
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switch (d->access_style) { |
switch (d->access_style) { |
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case MC146818_ALGOR: |
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d->reg[4 * MC_YEAR] += 80; |
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break; |
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case MC146818_ARC_NEC: |
case MC146818_ARC_NEC: |
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d->reg[4 * MC_YEAR] += (0x18 - 104); |
d->reg[4 * MC_YEAR] += (0x18 - 104); |
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break; |
break; |
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case MC146818_CATS: |
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d->reg[4 * MC_YEAR] %= 100; |
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break; |
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case MC146818_SGI: |
case MC146818_SGI: |
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/* |
/* |
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* NetBSD/sgimips assumes data in BCD format. |
* NetBSD/sgimips assumes data in BCD format. |
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(d->reg[4 * MC_YEAR] - 30 + 40) |
(d->reg[4 * MC_YEAR] - 30 + 40) |
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: (d->reg[4 * MC_YEAR] - 40) |
: (d->reg[4 * MC_YEAR] - 40) |
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); |
); |
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/* Century: */ |
/* Century: */ |
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d->reg[72 * 4] = 19 + (tmp->tm_year / 100); |
d->reg[72 * 4] = 19 + (tmp->tm_year / 100); |
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break; |
break; |
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case MC146818_DEC: |
case MC146818_DEC: |
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/* |
/* |
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struct tm *tmp; |
struct tm *tmp; |
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time_t timet; |
time_t timet; |
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struct mc_data *d = extra; |
struct mc_data *d = extra; |
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int i, relative_addr = r; |
int relative_addr = r; |
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size_t i; |
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relative_addr /= d->addrdiv; |
relative_addr /= d->addrdiv; |
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/* Different ways of accessing the registers: */ |
/* Different ways of accessing the registers: */ |
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switch (d->access_style) { |
switch (d->access_style) { |
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case MC146818_ALGOR: |
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case MC146818_CATS: |
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case MC146818_PC_CMOS: |
case MC146818_PC_CMOS: |
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if (relative_addr == 0x70 || relative_addr == 0x00) { |
if ((relative_addr & 1) == 0x00) { |
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if (writeflag == MEM_WRITE) { |
if (writeflag == MEM_WRITE) { |
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d->last_addr = data[0]; |
d->last_addr = data[0]; |
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return 1; |
return 1; |
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data[0] = d->last_addr; |
data[0] = d->last_addr; |
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return 1; |
return 1; |
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} |
} |
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} else if (relative_addr == 0x71 || relative_addr == 0x01) |
} else |
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relative_addr = d->last_addr * 4; |
relative_addr = d->last_addr * 4; |
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else { |
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fatal("[ mc146818: not accessed as an " |
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"MC146818_PC_CMOS device! ]\n"); |
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} |
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break; |
break; |
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case MC146818_ARC_NEC: |
case MC146818_ARC_NEC: |
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if (relative_addr == 0x01) { |
if (relative_addr == 0x01) { |
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* should be ignored. It works _almost_ as DEC, if offsets are |
* should be ignored. It works _almost_ as DEC, if offsets are |
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* divided by 0x40. |
* divided by 0x40. |
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*/ |
*/ |
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break; |
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case MC146818_PMPPC: |
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relative_addr *= 4; |
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break; |
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default: |
default: |
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; |
; |
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} |
} |
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fatal("[ mc146818: write to addr=0x%04x (len %i): ", |
fatal("[ mc146818: write to addr=0x%04x (len %i): ", |
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(int)relative_addr, (int)len); |
(int)relative_addr, (int)len); |
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for (i=0; i<len; i++) |
for (i=0; i<len; i++) |
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fatal("%02x ", data[i]); |
fatal("0x%02x ", data[i]); |
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fatal("]\n"); |
fatal("]\n"); |
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} |
} |
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#endif |
#endif |
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* Linux on at least sgimips and evbmips (Malta) wants the UIP bit |
* Linux on at least sgimips and evbmips (Malta) wants the UIP bit |
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* in REGA to be updated once a second. |
* in REGA to be updated once a second. |
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*/ |
*/ |
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timet = time(NULL); |
if (relative_addr == MC_REGA*4 || relative_addr == MC_REGC*4) { |
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tmp = gmtime(&timet); |
timet = time(NULL); |
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d->reg[MC_REGC * 4] &= ~MC_REGC_UF; |
tmp = gmtime(&timet); |
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d->reg[MC_REGC * 4] &= ~MC_REGC_UF; |
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if (tmp->tm_sec != d->previous_second) { |
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d->n_seconds_elapsed ++; |
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d->previous_second = tmp->tm_sec; |
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} |
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if (d->n_seconds_elapsed > d->uip_threshold) { |
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d->n_seconds_elapsed = 0; |
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if (tmp->tm_sec != d->previous_second) { |
d->reg[MC_REGA * 4] |= MC_REGA_UIP; |
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d->reg[MC_REGA * 4] &= ~MC_REGA_UIP; |
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d->reg[MC_REGC * 4] |= MC_REGC_UF; |
d->reg[MC_REGC * 4] |= MC_REGC_UF; |
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d->reg[MC_REGC * 4] |= MC_REGC_IRQF; |
d->reg[MC_REGC * 4] |= MC_REGC_IRQF; |
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d->previous_second = tmp->tm_sec; |
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/* For some reason, some Linux/DECstation KN04 kernels want |
/* For some reason, some Linux/DECstation KN04 |
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the PF (periodic flag) bit set, even though interrupts |
kernels want the PF (periodic flag) bit set, |
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are not enabled? */ |
even though interrupts are not enabled? */ |
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d->reg[MC_REGC * 4] |= MC_REGC_PF; |
d->reg[MC_REGC * 4] |= MC_REGC_PF; |
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} else |
} else |
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d->reg[MC_REGA * 4] |= MC_REGA_UIP; |
d->reg[MC_REGA * 4] &= ~MC_REGA_UIP; |
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} |
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/* RTC data is in either BCD format or binary: */ |
/* RTC data is in either BCD format or binary: */ |
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if (d->use_bcd) |
if (d->use_bcd) |
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case MC_RATE_8_Hz: d->interrupt_hz = 8; break; |
case MC_RATE_8_Hz: d->interrupt_hz = 8; break; |
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case MC_RATE_4_Hz: d->interrupt_hz = 4; break; |
case MC_RATE_4_Hz: d->interrupt_hz = 4; break; |
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case MC_RATE_2_Hz: d->interrupt_hz = 2; break; |
case MC_RATE_2_Hz: d->interrupt_hz = 2; break; |
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default: |
default:/* debug("[ mc146818: unimplemented " |
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/* debug("[ mc146818: unimplemented " |
|
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"MC_REGA RS: %i ]\n", |
"MC_REGA RS: %i ]\n", |
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data[0] & MC_REGA_RSMASK); */ |
data[0] & MC_REGA_RSMASK); */ |
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; |
; |
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case 0x128: |
case 0x128: |
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d->reg[relative_addr] = data[0]; |
d->reg[relative_addr] = data[0]; |
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if (data[0] & 8) { |
if (data[0] & 8) { |
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int j; |
511 |
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/* Used on SGI to power off the machine. */ |
/* Used on SGI to power off the machine. */ |
513 |
fatal("[ md146818: power off ]\n"); |
fatal("[ md146818: power off ]\n"); |
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for (i=0; i<cpu->machine->ncpus; i++) |
for (j=0; j<cpu->machine->ncpus; j++) |
515 |
cpu->machine->cpus[i]->running = 0; |
cpu->machine->cpus[j]->running = 0; |
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cpu->machine-> |
cpu->machine-> |
517 |
exit_without_entering_debugger = 1; |
exit_without_entering_debugger = 1; |
518 |
} |
} |
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case 0x15: |
case 0x15: |
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break; |
break; |
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case 4 * MC_SEC: |
case 4 * MC_SEC: |
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if (d->ugly_netbsd_prep_hack_done < NETBSD_HACK_DONE) { |
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d->ugly_netbsd_prep_hack_done ++; |
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switch (d->ugly_netbsd_prep_hack_done) { |
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case NETBSD_HACK_FIRST_1: |
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d->ugly_netbsd_prep_hack_sec = |
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from_bcd(d->reg[relative_addr]); |
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break; |
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case NETBSD_HACK_FIRST_2: |
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d->reg[relative_addr] = to_bcd( |
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d->ugly_netbsd_prep_hack_sec); |
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break; |
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case NETBSD_HACK_SECOND_1: |
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case NETBSD_HACK_SECOND_2: |
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d->reg[relative_addr] = to_bcd((1 + |
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d->ugly_netbsd_prep_hack_sec) % 60); |
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break; |
556 |
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} |
557 |
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} |
558 |
case 4 * MC_MIN: |
case 4 * MC_MIN: |
559 |
case 4 * MC_HOUR: |
case 4 * MC_HOUR: |
560 |
case 4 * MC_DOW: |
case 4 * MC_DOW: |
571 |
if (d->reg[MC_REGB * 4] & MC_REGB_SET) |
if (d->reg[MC_REGB * 4] & MC_REGB_SET) |
572 |
break; |
break; |
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mc146818_update_time(d); |
if (d->ugly_netbsd_prep_hack_done >= NETBSD_HACK_DONE) |
575 |
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mc146818_update_time(d); |
576 |
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break; |
577 |
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case 4 * MC_REGA: |
578 |
break; |
break; |
579 |
case 4 * MC_REGC: /* Interrupt ack. */ |
case 4 * MC_REGC: /* Interrupt ack. */ |
580 |
/* NOTE: Acking is done below, _after_ the |
/* NOTE: Acking is done below, _after_ the |
581 |
register has been read. */ |
register has been read. */ |
582 |
break; |
break; |
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default: |
default:debug("[ mc146818: read from relative_addr = " |
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debug("[ mc146818: read from relative_addr = " |
|
584 |
"%04x ]\n", (int)relative_addr); |
"%04x ]\n", (int)relative_addr); |
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; |
|
585 |
} |
} |
586 |
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data[0] = d->reg[relative_addr]; |
data[0] = d->reg[relative_addr]; |
599 |
fatal("[ mc146818: read from addr=0x%04x (len %i): ", |
fatal("[ mc146818: read from addr=0x%04x (len %i): ", |
600 |
(int)relative_addr, (int)len); |
(int)relative_addr, (int)len); |
601 |
for (i=0; i<len; i++) |
for (i=0; i<len; i++) |
602 |
fatal("%02x ", data[i]); |
fatal("0x%02x ", data[i]); |
603 |
fatal("]\n"); |
fatal("]\n"); |
604 |
} |
} |
605 |
#endif |
#endif |
632 |
d->access_style = access_style; |
d->access_style = access_style; |
633 |
d->addrdiv = addrdiv; |
d->addrdiv = addrdiv; |
634 |
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/* Only SGIs and PCs use BCD format (?) */ |
|
635 |
d->use_bcd = 0; |
d->use_bcd = 0; |
636 |
if (access_style == MC146818_SGI || access_style == MC146818_PC_CMOS) |
switch (access_style) { |
637 |
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case MC146818_SGI: |
638 |
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case MC146818_PC_CMOS: |
639 |
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case MC146818_PMPPC: |
640 |
d->use_bcd = 1; |
d->use_bcd = 1; |
641 |
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} |
642 |
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643 |
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if (machine->machine_type != MACHINE_PREP) { |
644 |
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/* NetBSD/prep has a really ugly clock detection code; |
645 |
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no other machines/OSes don't need this. */ |
646 |
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d->ugly_netbsd_prep_hack_done = NETBSD_HACK_DONE; |
647 |
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} |
648 |
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649 |
if (access_style == MC146818_DEC) { |
if (access_style == MC146818_DEC) { |
650 |
/* Station Ethernet Address, on DECstation 3100: */ |
/* Station Ethernet Address, on DECstation 3100: */ |
684 |
d->reg[0xf8] = 1; |
d->reg[0xf8] = 1; |
685 |
} |
} |
686 |
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687 |
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/* |
688 |
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* uip_threshold should ideally be 1, but when Linux polls the UIP bit |
689 |
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* it looses speed. This hack gives Linux the impression that the cpu |
690 |
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* is uip_threshold times faster than the slow clock it would |
691 |
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* otherwise detect. |
692 |
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* |
693 |
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* TODO: Find out if this messes up Sprite emulation; if so, then |
694 |
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* this hack has to be removed. |
695 |
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*/ |
696 |
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d->uip_threshold = 8; |
697 |
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698 |
if (access_style == MC146818_ARC_JAZZ) |
if (access_style == MC146818_ARC_JAZZ) |
699 |
memory_device_register(mem, "mc146818_jazz", 0x90000070ULL, |
memory_device_register(mem, "mc146818_jazz", 0x90000070ULL, |
700 |
1, dev_mc146818_jazz_access, d, MEM_DEFAULT, NULL); |
1, dev_mc146818_jazz_access, d, DM_DEFAULT, NULL); |
701 |
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|
702 |
dev_len = DEV_MC146818_LENGTH; |
dev_len = DEV_MC146818_LENGTH; |
703 |
switch (access_style) { |
switch (access_style) { |
704 |
|
case MC146818_CATS: |
705 |
case MC146818_PC_CMOS: |
case MC146818_PC_CMOS: |
706 |
dev_len = 2; |
dev_len = 2; |
707 |
break; |
break; |
711 |
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|
712 |
memory_device_register(mem, "mc146818", baseaddr, |
memory_device_register(mem, "mc146818", baseaddr, |
713 |
dev_len * addrdiv, dev_mc146818_access, |
dev_len * addrdiv, dev_mc146818_access, |
714 |
d, MEM_DEFAULT, NULL); |
d, DM_DEFAULT, NULL); |
715 |
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|
716 |
mc146818_update_time(d); |
mc146818_update_time(d); |
717 |
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