aboutsummaryrefslogtreecommitdiffstats
path: root/hw/m48t59.c
diff options
context:
space:
mode:
Diffstat (limited to 'hw/m48t59.c')
-rw-r--r--hw/m48t59.c614
1 files changed, 0 insertions, 614 deletions
diff --git a/hw/m48t59.c b/hw/m48t59.c
deleted file mode 100644
index daa1c52..0000000
--- a/hw/m48t59.c
+++ /dev/null
@@ -1,614 +0,0 @@
-/*
- * QEMU M48T59 and M48T08 NVRAM emulation for PPC PREP and Sparc platforms
- *
- * Copyright (c) 2003-2005 Jocelyn Mayer
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
-#include "vl.h"
-#include "m48t59.h"
-
-//#define DEBUG_NVRAM
-
-#if defined(DEBUG_NVRAM)
-#define NVRAM_PRINTF(fmt, args...) do { printf(fmt , ##args); } while (0)
-#else
-#define NVRAM_PRINTF(fmt, args...) do { } while (0)
-#endif
-
-/*
- * The M48T08 and M48T59 chips are very similar. The newer '59 has
- * alarm and a watchdog timer and related control registers. In the
- * PPC platform there is also a nvram lock function.
- */
-struct m48t59_t {
- /* Model parameters */
- int type; // 8 = m48t08, 59 = m48t59
- /* Hardware parameters */
- int IRQ;
- int mem_index;
- uint32_t mem_base;
- uint32_t io_base;
- uint16_t size;
- /* RTC management */
- time_t time_offset;
- time_t stop_time;
- /* Alarm & watchdog */
- time_t alarm;
- struct QEMUTimer *alrm_timer;
- struct QEMUTimer *wd_timer;
- /* NVRAM storage */
- uint8_t lock;
- uint16_t addr;
- uint8_t *buffer;
-};
-
-/* Fake timer functions */
-/* Generic helpers for BCD */
-static inline uint8_t toBCD (uint8_t value)
-{
- return (((value / 10) % 10) << 4) | (value % 10);
-}
-
-static inline uint8_t fromBCD (uint8_t BCD)
-{
- return ((BCD >> 4) * 10) + (BCD & 0x0F);
-}
-
-/* RTC management helpers */
-static void get_time (m48t59_t *NVRAM, struct tm *tm)
-{
- time_t t;
-
- t = time(NULL) + NVRAM->time_offset;
-#ifdef _WIN32
- memcpy(tm,localtime(&t),sizeof(*tm));
-#else
- localtime_r (&t, tm) ;
-#endif
-}
-
-static void set_time (m48t59_t *NVRAM, struct tm *tm)
-{
- time_t now, new_time;
-
- new_time = mktime(tm);
- now = time(NULL);
- NVRAM->time_offset = new_time - now;
-}
-
-/* Alarm management */
-static void alarm_cb (void *opaque)
-{
- struct tm tm, tm_now;
- uint64_t next_time;
- m48t59_t *NVRAM = opaque;
-
- pic_set_irq(NVRAM->IRQ, 1);
- if ((NVRAM->buffer[0x1FF5] & 0x80) == 0 &&
- (NVRAM->buffer[0x1FF4] & 0x80) == 0 &&
- (NVRAM->buffer[0x1FF3] & 0x80) == 0 &&
- (NVRAM->buffer[0x1FF2] & 0x80) == 0) {
- /* Repeat once a month */
- get_time(NVRAM, &tm_now);
- memcpy(&tm, &tm_now, sizeof(struct tm));
- tm.tm_mon++;
- if (tm.tm_mon == 13) {
- tm.tm_mon = 1;
- tm.tm_year++;
- }
- next_time = mktime(&tm);
- } else if ((NVRAM->buffer[0x1FF5] & 0x80) != 0 &&
- (NVRAM->buffer[0x1FF4] & 0x80) == 0 &&
- (NVRAM->buffer[0x1FF3] & 0x80) == 0 &&
- (NVRAM->buffer[0x1FF2] & 0x80) == 0) {
- /* Repeat once a day */
- next_time = 24 * 60 * 60 + mktime(&tm_now);
- } else if ((NVRAM->buffer[0x1FF5] & 0x80) != 0 &&
- (NVRAM->buffer[0x1FF4] & 0x80) != 0 &&
- (NVRAM->buffer[0x1FF3] & 0x80) == 0 &&
- (NVRAM->buffer[0x1FF2] & 0x80) == 0) {
- /* Repeat once an hour */
- next_time = 60 * 60 + mktime(&tm_now);
- } else if ((NVRAM->buffer[0x1FF5] & 0x80) != 0 &&
- (NVRAM->buffer[0x1FF4] & 0x80) != 0 &&
- (NVRAM->buffer[0x1FF3] & 0x80) != 0 &&
- (NVRAM->buffer[0x1FF2] & 0x80) == 0) {
- /* Repeat once a minute */
- next_time = 60 + mktime(&tm_now);
- } else {
- /* Repeat once a second */
- next_time = 1 + mktime(&tm_now);
- }
- qemu_mod_timer(NVRAM->alrm_timer, next_time * 1000);
- pic_set_irq(NVRAM->IRQ, 0);
-}
-
-
-static void get_alarm (m48t59_t *NVRAM, struct tm *tm)
-{
-#ifdef _WIN32
- memcpy(tm,localtime(&NVRAM->alarm),sizeof(*tm));
-#else
- localtime_r (&NVRAM->alarm, tm);
-#endif
-}
-
-static void set_alarm (m48t59_t *NVRAM, struct tm *tm)
-{
- NVRAM->alarm = mktime(tm);
- if (NVRAM->alrm_timer != NULL) {
- qemu_del_timer(NVRAM->alrm_timer);
- NVRAM->alrm_timer = NULL;
- }
- if (NVRAM->alarm - time(NULL) > 0)
- qemu_mod_timer(NVRAM->alrm_timer, NVRAM->alarm * 1000);
-}
-
-/* Watchdog management */
-static void watchdog_cb (void *opaque)
-{
- m48t59_t *NVRAM = opaque;
-
- NVRAM->buffer[0x1FF0] |= 0x80;
- if (NVRAM->buffer[0x1FF7] & 0x80) {
- NVRAM->buffer[0x1FF7] = 0x00;
- NVRAM->buffer[0x1FFC] &= ~0x40;
- /* May it be a hw CPU Reset instead ? */
- qemu_system_reset_request();
- } else {
- pic_set_irq(NVRAM->IRQ, 1);
- pic_set_irq(NVRAM->IRQ, 0);
- }
-}
-
-static void set_up_watchdog (m48t59_t *NVRAM, uint8_t value)
-{
- uint64_t interval; /* in 1/16 seconds */
-
- if (NVRAM->wd_timer != NULL) {
- qemu_del_timer(NVRAM->wd_timer);
- NVRAM->wd_timer = NULL;
- }
- NVRAM->buffer[0x1FF0] &= ~0x80;
- if (value != 0) {
- interval = (1 << (2 * (value & 0x03))) * ((value >> 2) & 0x1F);
- qemu_mod_timer(NVRAM->wd_timer, ((uint64_t)time(NULL) * 1000) +
- ((interval * 1000) >> 4));
- }
-}
-
-/* Direct access to NVRAM */
-void m48t59_write (m48t59_t *NVRAM, uint32_t addr, uint32_t val)
-{
- struct tm tm;
- int tmp;
-
- if (addr > 0x1FF8 && addr < 0x2000)
- NVRAM_PRINTF("%s: 0x%08x => 0x%08x\n", __func__, addr, val);
- if (NVRAM->type == 8 &&
- (addr >= 0x1ff0 && addr <= 0x1ff7))
- goto do_write;
- switch (addr) {
- case 0x1FF0:
- /* flags register : read-only */
- break;
- case 0x1FF1:
- /* unused */
- break;
- case 0x1FF2:
- /* alarm seconds */
- tmp = fromBCD(val & 0x7F);
- if (tmp >= 0 && tmp <= 59) {
- get_alarm(NVRAM, &tm);
- tm.tm_sec = tmp;
- NVRAM->buffer[0x1FF2] = val;
- set_alarm(NVRAM, &tm);
- }
- break;
- case 0x1FF3:
- /* alarm minutes */
- tmp = fromBCD(val & 0x7F);
- if (tmp >= 0 && tmp <= 59) {
- get_alarm(NVRAM, &tm);
- tm.tm_min = tmp;
- NVRAM->buffer[0x1FF3] = val;
- set_alarm(NVRAM, &tm);
- }
- break;
- case 0x1FF4:
- /* alarm hours */
- tmp = fromBCD(val & 0x3F);
- if (tmp >= 0 && tmp <= 23) {
- get_alarm(NVRAM, &tm);
- tm.tm_hour = tmp;
- NVRAM->buffer[0x1FF4] = val;
- set_alarm(NVRAM, &tm);
- }
- break;
- case 0x1FF5:
- /* alarm date */
- tmp = fromBCD(val & 0x1F);
- if (tmp != 0) {
- get_alarm(NVRAM, &tm);
- tm.tm_mday = tmp;
- NVRAM->buffer[0x1FF5] = val;
- set_alarm(NVRAM, &tm);
- }
- break;
- case 0x1FF6:
- /* interrupts */
- NVRAM->buffer[0x1FF6] = val;
- break;
- case 0x1FF7:
- /* watchdog */
- NVRAM->buffer[0x1FF7] = val;
- set_up_watchdog(NVRAM, val);
- break;
- case 0x1FF8:
- /* control */
- NVRAM->buffer[0x1FF8] = (val & ~0xA0) | 0x90;
- break;
- case 0x1FF9:
- /* seconds (BCD) */
- tmp = fromBCD(val & 0x7F);
- if (tmp >= 0 && tmp <= 59) {
- get_time(NVRAM, &tm);
- tm.tm_sec = tmp;
- set_time(NVRAM, &tm);
- }
- if ((val & 0x80) ^ (NVRAM->buffer[0x1FF9] & 0x80)) {
- if (val & 0x80) {
- NVRAM->stop_time = time(NULL);
- } else {
- NVRAM->time_offset += NVRAM->stop_time - time(NULL);
- NVRAM->stop_time = 0;
- }
- }
- NVRAM->buffer[0x1FF9] = val & 0x80;
- break;
- case 0x1FFA:
- /* minutes (BCD) */
- tmp = fromBCD(val & 0x7F);
- if (tmp >= 0 && tmp <= 59) {
- get_time(NVRAM, &tm);
- tm.tm_min = tmp;
- set_time(NVRAM, &tm);
- }
- break;
- case 0x1FFB:
- /* hours (BCD) */
- tmp = fromBCD(val & 0x3F);
- if (tmp >= 0 && tmp <= 23) {
- get_time(NVRAM, &tm);
- tm.tm_hour = tmp;
- set_time(NVRAM, &tm);
- }
- break;
- case 0x1FFC:
- /* day of the week / century */
- tmp = fromBCD(val & 0x07);
- get_time(NVRAM, &tm);
- tm.tm_wday = tmp;
- set_time(NVRAM, &tm);
- NVRAM->buffer[0x1FFC] = val & 0x40;
- break;
- case 0x1FFD:
- /* date */
- tmp = fromBCD(val & 0x1F);
- if (tmp != 0) {
- get_time(NVRAM, &tm);
- tm.tm_mday = tmp;
- set_time(NVRAM, &tm);
- }
- break;
- case 0x1FFE:
- /* month */
- tmp = fromBCD(val & 0x1F);
- if (tmp >= 1 && tmp <= 12) {
- get_time(NVRAM, &tm);
- tm.tm_mon = tmp - 1;
- set_time(NVRAM, &tm);
- }
- break;
- case 0x1FFF:
- /* year */
- tmp = fromBCD(val);
- if (tmp >= 0 && tmp <= 99) {
- get_time(NVRAM, &tm);
- if (NVRAM->type == 8)
- tm.tm_year = fromBCD(val) + 68; // Base year is 1968
- else
- tm.tm_year = fromBCD(val);
- set_time(NVRAM, &tm);
- }
- break;
- default:
- /* Check lock registers state */
- if (addr >= 0x20 && addr <= 0x2F && (NVRAM->lock & 1))
- break;
- if (addr >= 0x30 && addr <= 0x3F && (NVRAM->lock & 2))
- break;
- do_write:
- if (addr < NVRAM->size) {
- NVRAM->buffer[addr] = val & 0xFF;
- }
- break;
- }
-}
-
-uint32_t m48t59_read (m48t59_t *NVRAM, uint32_t addr)
-{
- struct tm tm;
- uint32_t retval = 0xFF;
-
- if (NVRAM->type == 8 &&
- (addr >= 0x1ff0 && addr <= 0x1ff7))
- goto do_read;
- switch (addr) {
- case 0x1FF0:
- /* flags register */
- goto do_read;
- case 0x1FF1:
- /* unused */
- retval = 0;
- break;
- case 0x1FF2:
- /* alarm seconds */
- goto do_read;
- case 0x1FF3:
- /* alarm minutes */
- goto do_read;
- case 0x1FF4:
- /* alarm hours */
- goto do_read;
- case 0x1FF5:
- /* alarm date */
- goto do_read;
- case 0x1FF6:
- /* interrupts */
- goto do_read;
- case 0x1FF7:
- /* A read resets the watchdog */
- set_up_watchdog(NVRAM, NVRAM->buffer[0x1FF7]);
- goto do_read;
- case 0x1FF8:
- /* control */
- goto do_read;
- case 0x1FF9:
- /* seconds (BCD) */
- get_time(NVRAM, &tm);
- retval = (NVRAM->buffer[0x1FF9] & 0x80) | toBCD(tm.tm_sec);
- break;
- case 0x1FFA:
- /* minutes (BCD) */
- get_time(NVRAM, &tm);
- retval = toBCD(tm.tm_min);
- break;
- case 0x1FFB:
- /* hours (BCD) */
- get_time(NVRAM, &tm);
- retval = toBCD(tm.tm_hour);
- break;
- case 0x1FFC:
- /* day of the week / century */
- get_time(NVRAM, &tm);
- retval = NVRAM->buffer[0x1FFC] | tm.tm_wday;
- break;
- case 0x1FFD:
- /* date */
- get_time(NVRAM, &tm);
- retval = toBCD(tm.tm_mday);
- break;
- case 0x1FFE:
- /* month */
- get_time(NVRAM, &tm);
- retval = toBCD(tm.tm_mon + 1);
- break;
- case 0x1FFF:
- /* year */
- get_time(NVRAM, &tm);
- if (NVRAM->type == 8)
- retval = toBCD(tm.tm_year - 68); // Base year is 1968
- else
- retval = toBCD(tm.tm_year);
- break;
- default:
- /* Check lock registers state */
- if (addr >= 0x20 && addr <= 0x2F && (NVRAM->lock & 1))
- break;
- if (addr >= 0x30 && addr <= 0x3F && (NVRAM->lock & 2))
- break;
- do_read:
- if (addr < NVRAM->size) {
- retval = NVRAM->buffer[addr];
- }
- break;
- }
- if (addr > 0x1FF9 && addr < 0x2000)
- NVRAM_PRINTF("0x%08x <= 0x%08x\n", addr, retval);
-
- return retval;
-}
-
-void m48t59_set_addr (m48t59_t *NVRAM, uint32_t addr)
-{
- NVRAM->addr = addr;
-}
-
-void m48t59_toggle_lock (m48t59_t *NVRAM, int lock)
-{
- NVRAM->lock ^= 1 << lock;
-}
-
-/* IO access to NVRAM */
-static void NVRAM_writeb (void *opaque, uint32_t addr, uint32_t val)
-{
- m48t59_t *NVRAM = opaque;
-
- addr -= NVRAM->io_base;
- NVRAM_PRINTF("0x%08x => 0x%08x\n", addr, val);
- switch (addr) {
- case 0:
- NVRAM->addr &= ~0x00FF;
- NVRAM->addr |= val;
- break;
- case 1:
- NVRAM->addr &= ~0xFF00;
- NVRAM->addr |= val << 8;
- break;
- case 3:
- m48t59_write(NVRAM, val, NVRAM->addr);
- NVRAM->addr = 0x0000;
- break;
- default:
- break;
- }
-}
-
-static uint32_t NVRAM_readb (void *opaque, uint32_t addr)
-{
- m48t59_t *NVRAM = opaque;
- uint32_t retval;
-
- addr -= NVRAM->io_base;
- switch (addr) {
- case 3:
- retval = m48t59_read(NVRAM, NVRAM->addr);
- break;
- default:
- retval = -1;
- break;
- }
- NVRAM_PRINTF("0x%08x <= 0x%08x\n", addr, retval);
-
- return retval;
-}
-
-static void nvram_writeb (void *opaque, target_phys_addr_t addr, uint32_t value)
-{
- m48t59_t *NVRAM = opaque;
-
- addr -= NVRAM->mem_base;
- m48t59_write(NVRAM, addr, value & 0xff);
-}
-
-static void nvram_writew (void *opaque, target_phys_addr_t addr, uint32_t value)
-{
- m48t59_t *NVRAM = opaque;
-
- addr -= NVRAM->mem_base;
- m48t59_write(NVRAM, addr, (value >> 8) & 0xff);
- m48t59_write(NVRAM, addr + 1, value & 0xff);
-}
-
-static void nvram_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
-{
- m48t59_t *NVRAM = opaque;
-
- addr -= NVRAM->mem_base;
- m48t59_write(NVRAM, addr, (value >> 24) & 0xff);
- m48t59_write(NVRAM, addr + 1, (value >> 16) & 0xff);
- m48t59_write(NVRAM, addr + 2, (value >> 8) & 0xff);
- m48t59_write(NVRAM, addr + 3, value & 0xff);
-}
-
-static uint32_t nvram_readb (void *opaque, target_phys_addr_t addr)
-{
- m48t59_t *NVRAM = opaque;
- uint32_t retval;
-
- addr -= NVRAM->mem_base;
- retval = m48t59_read(NVRAM, addr);
- return retval;
-}
-
-static uint32_t nvram_readw (void *opaque, target_phys_addr_t addr)
-{
- m48t59_t *NVRAM = opaque;
- uint32_t retval;
-
- addr -= NVRAM->mem_base;
- retval = m48t59_read(NVRAM, addr) << 8;
- retval |= m48t59_read(NVRAM, addr + 1);
- return retval;
-}
-
-static uint32_t nvram_readl (void *opaque, target_phys_addr_t addr)
-{
- m48t59_t *NVRAM = opaque;
- uint32_t retval;
-
- addr -= NVRAM->mem_base;
- retval = m48t59_read(NVRAM, addr) << 24;
- retval |= m48t59_read(NVRAM, addr + 1) << 16;
- retval |= m48t59_read(NVRAM, addr + 2) << 8;
- retval |= m48t59_read(NVRAM, addr + 3);
- return retval;
-}
-
-static CPUWriteMemoryFunc *nvram_write[] = {
- &nvram_writeb,
- &nvram_writew,
- &nvram_writel,
-};
-
-static CPUReadMemoryFunc *nvram_read[] = {
- &nvram_readb,
- &nvram_readw,
- &nvram_readl,
-};
-
-/* Initialisation routine */
-m48t59_t *m48t59_init (int IRQ, target_ulong mem_base,
- uint32_t io_base, uint16_t size,
- int type)
-{
- m48t59_t *s;
-
- s = qemu_mallocz(sizeof(m48t59_t));
- if (!s)
- return NULL;
- s->buffer = qemu_mallocz(size);
- if (!s->buffer) {
- qemu_free(s);
- return NULL;
- }
- s->IRQ = IRQ;
- s->size = size;
- s->mem_base = mem_base;
- s->io_base = io_base;
- s->addr = 0;
- s->type = type;
- if (io_base != 0) {
- register_ioport_read(io_base, 0x04, 1, NVRAM_readb, s);
- register_ioport_write(io_base, 0x04, 1, NVRAM_writeb, s);
- }
- if (mem_base != 0) {
- s->mem_index = cpu_register_io_memory(0, nvram_read, nvram_write, s);
- cpu_register_physical_memory(mem_base, 0x4000, s->mem_index);
- }
- if (type == 59) {
- s->alrm_timer = qemu_new_timer(vm_clock, &alarm_cb, s);
- s->wd_timer = qemu_new_timer(vm_clock, &watchdog_cb, s);
- }
- s->lock = 0;
-
- return s;
-}
generated by cgit v1.1 at 2025-08-18 05:26:50 +0000