root / hw / m48t59.c @ 4e3e9d0b
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/*
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* QEMU M48T59 NVRAM emulation for PPC PREP platform
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*
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* Copyright (c) 2003-2004 Jocelyn Mayer
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "vl.h" |
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#include "m48t59.h" |
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//#define DEBUG_NVRAM
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#if defined(DEBUG_NVRAM)
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#define NVRAM_PRINTF(fmt, args...) do { printf(fmt , ##args); } while (0) |
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#else
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#define NVRAM_PRINTF(fmt, args...) do { } while (0) |
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#endif
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struct m48t59_t {
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/* Hardware parameters */
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int IRQ;
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uint32_t io_base; |
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uint16_t size; |
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/* RTC management */
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time_t time_offset; |
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time_t stop_time; |
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/* Alarm & watchdog */
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time_t alarm; |
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struct QEMUTimer *alrm_timer;
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struct QEMUTimer *wd_timer;
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/* NVRAM storage */
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uint8_t lock; |
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uint16_t addr; |
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uint8_t *buffer; |
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}; |
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|
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/* Fake timer functions */
|
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/* Generic helpers for BCD */
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static inline uint8_t toBCD (uint8_t value) |
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{
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return (((value / 10) % 10) << 4) | (value % 10); |
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} |
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static inline uint8_t fromBCD (uint8_t BCD) |
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{
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return ((BCD >> 4) * 10) + (BCD & 0x0F); |
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} |
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|
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/* RTC management helpers */
|
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static void get_time (m48t59_t *NVRAM, struct tm *tm) |
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{
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time_t t; |
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|
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t = time(NULL) + NVRAM->time_offset;
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#ifdef _WIN32
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memcpy(tm,localtime(&t),sizeof(*tm));
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#else
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localtime_r (&t, tm) ; |
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#endif
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} |
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static void set_time (m48t59_t *NVRAM, struct tm *tm) |
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{
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time_t now, new_time; |
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|
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new_time = mktime(tm); |
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now = time(NULL);
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NVRAM->time_offset = new_time - now; |
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} |
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|
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/* Alarm management */
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static void alarm_cb (void *opaque) |
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{
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struct tm tm, tm_now;
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uint64_t next_time; |
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m48t59_t *NVRAM = opaque; |
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pic_set_irq(NVRAM->IRQ, 1);
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if ((NVRAM->buffer[0x1FF5] & 0x80) == 0 && |
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(NVRAM->buffer[0x1FF4] & 0x80) == 0 && |
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(NVRAM->buffer[0x1FF3] & 0x80) == 0 && |
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(NVRAM->buffer[0x1FF2] & 0x80) == 0) { |
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/* Repeat once a month */
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get_time(NVRAM, &tm_now); |
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memcpy(&tm, &tm_now, sizeof(struct tm)); |
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tm.tm_mon++; |
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if (tm.tm_mon == 13) { |
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tm.tm_mon = 1;
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tm.tm_year++; |
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} |
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next_time = mktime(&tm); |
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} else if ((NVRAM->buffer[0x1FF5] & 0x80) != 0 && |
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(NVRAM->buffer[0x1FF4] & 0x80) == 0 && |
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(NVRAM->buffer[0x1FF3] & 0x80) == 0 && |
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(NVRAM->buffer[0x1FF2] & 0x80) == 0) { |
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/* Repeat once a day */
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next_time = 24 * 60 * 60 + mktime(&tm_now); |
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} else if ((NVRAM->buffer[0x1FF5] & 0x80) != 0 && |
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(NVRAM->buffer[0x1FF4] & 0x80) != 0 && |
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(NVRAM->buffer[0x1FF3] & 0x80) == 0 && |
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(NVRAM->buffer[0x1FF2] & 0x80) == 0) { |
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/* Repeat once an hour */
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next_time = 60 * 60 + mktime(&tm_now); |
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} else if ((NVRAM->buffer[0x1FF5] & 0x80) != 0 && |
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(NVRAM->buffer[0x1FF4] & 0x80) != 0 && |
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(NVRAM->buffer[0x1FF3] & 0x80) != 0 && |
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(NVRAM->buffer[0x1FF2] & 0x80) == 0) { |
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/* Repeat once a minute */
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next_time = 60 + mktime(&tm_now);
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} else {
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/* Repeat once a second */
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next_time = 1 + mktime(&tm_now);
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} |
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qemu_mod_timer(NVRAM->alrm_timer, next_time * 1000);
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pic_set_irq(NVRAM->IRQ, 0);
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} |
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static void get_alarm (m48t59_t *NVRAM, struct tm *tm) |
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{
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#ifdef _WIN32
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memcpy(tm,localtime(&NVRAM->alarm),sizeof(*tm));
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#else
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localtime_r (&NVRAM->alarm, tm); |
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#endif
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} |
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static void set_alarm (m48t59_t *NVRAM, struct tm *tm) |
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{
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NVRAM->alarm = mktime(tm); |
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if (NVRAM->alrm_timer != NULL) { |
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qemu_del_timer(NVRAM->alrm_timer); |
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NVRAM->alrm_timer = NULL;
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} |
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if (NVRAM->alarm - time(NULL) > 0) |
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qemu_mod_timer(NVRAM->alrm_timer, NVRAM->alarm * 1000);
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} |
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/* Watchdog management */
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static void watchdog_cb (void *opaque) |
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{
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m48t59_t *NVRAM = opaque; |
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NVRAM->buffer[0x1FF0] |= 0x80; |
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if (NVRAM->buffer[0x1FF7] & 0x80) { |
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NVRAM->buffer[0x1FF7] = 0x00; |
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NVRAM->buffer[0x1FFC] &= ~0x40; |
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/* May it be a hw CPU Reset instead ? */
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reset_requested = 1;
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printf("Watchdog reset...\n");
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cpu_interrupt(cpu_single_env, CPU_INTERRUPT_EXIT); |
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} else {
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pic_set_irq(NVRAM->IRQ, 1);
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pic_set_irq(NVRAM->IRQ, 0);
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} |
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} |
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static void set_up_watchdog (m48t59_t *NVRAM, uint8_t value) |
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{
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uint64_t interval; /* in 1/16 seconds */
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|
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if (NVRAM->wd_timer != NULL) { |
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qemu_del_timer(NVRAM->wd_timer); |
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NVRAM->wd_timer = NULL;
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} |
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NVRAM->buffer[0x1FF0] &= ~0x80; |
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if (value != 0) { |
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interval = (1 << (2 * (value & 0x03))) * ((value >> 2) & 0x1F); |
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qemu_mod_timer(NVRAM->wd_timer, ((uint64_t)time(NULL) * 1000) + |
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((interval * 1000) >> 4)); |
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} |
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} |
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|
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/* Direct access to NVRAM */
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void m48t59_write (m48t59_t *NVRAM, uint32_t val)
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{
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struct tm tm;
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int tmp;
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|
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if (NVRAM->addr > 0x1FF8 && NVRAM->addr < 0x2000) |
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NVRAM_PRINTF("%s: 0x%08x => 0x%08x\n", __func__, NVRAM->addr, val);
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switch (NVRAM->addr) {
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case 0x1FF0: |
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/* flags register : read-only */
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break;
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case 0x1FF1: |
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/* unused */
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break;
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case 0x1FF2: |
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/* alarm seconds */
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tmp = fromBCD(val & 0x7F);
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if (tmp >= 0 && tmp <= 59) { |
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get_alarm(NVRAM, &tm); |
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tm.tm_sec = tmp; |
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NVRAM->buffer[0x1FF2] = val;
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set_alarm(NVRAM, &tm); |
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} |
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break;
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case 0x1FF3: |
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/* alarm minutes */
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tmp = fromBCD(val & 0x7F);
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if (tmp >= 0 && tmp <= 59) { |
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get_alarm(NVRAM, &tm); |
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tm.tm_min = tmp; |
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NVRAM->buffer[0x1FF3] = val;
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set_alarm(NVRAM, &tm); |
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} |
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break;
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case 0x1FF4: |
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/* alarm hours */
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tmp = fromBCD(val & 0x3F);
|
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if (tmp >= 0 && tmp <= 23) { |
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get_alarm(NVRAM, &tm); |
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tm.tm_hour = tmp; |
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NVRAM->buffer[0x1FF4] = val;
|
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set_alarm(NVRAM, &tm); |
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} |
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break;
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case 0x1FF5: |
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/* alarm date */
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tmp = fromBCD(val & 0x1F);
|
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if (tmp != 0) { |
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get_alarm(NVRAM, &tm); |
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tm.tm_mday = tmp; |
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NVRAM->buffer[0x1FF5] = val;
|
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set_alarm(NVRAM, &tm); |
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} |
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break;
|
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case 0x1FF6: |
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/* interrupts */
|
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NVRAM->buffer[0x1FF6] = val;
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break;
|
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case 0x1FF7: |
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/* watchdog */
|
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NVRAM->buffer[0x1FF7] = val;
|
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set_up_watchdog(NVRAM, val); |
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break;
|
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case 0x1FF8: |
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/* control */
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NVRAM->buffer[0x1FF8] = (val & ~0xA0) | 0x90; |
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break;
|
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case 0x1FF9: |
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/* seconds (BCD) */
|
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tmp = fromBCD(val & 0x7F);
|
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if (tmp >= 0 && tmp <= 59) { |
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get_time(NVRAM, &tm); |
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tm.tm_sec = tmp; |
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set_time(NVRAM, &tm); |
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} |
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if ((val & 0x80) ^ (NVRAM->buffer[0x1FF9] & 0x80)) { |
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if (val & 0x80) { |
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NVRAM->stop_time = time(NULL);
|
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} else {
|
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NVRAM->time_offset += NVRAM->stop_time - time(NULL);
|
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NVRAM->stop_time = 0;
|
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} |
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} |
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NVRAM->buffer[0x1FF9] = val & 0x80; |
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break;
|
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case 0x1FFA: |
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/* minutes (BCD) */
|
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tmp = fromBCD(val & 0x7F);
|
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if (tmp >= 0 && tmp <= 59) { |
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get_time(NVRAM, &tm); |
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tm.tm_min = tmp; |
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set_time(NVRAM, &tm); |
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} |
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break;
|
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case 0x1FFB: |
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/* hours (BCD) */
|
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tmp = fromBCD(val & 0x3F);
|
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if (tmp >= 0 && tmp <= 23) { |
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get_time(NVRAM, &tm); |
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tm.tm_hour = tmp; |
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set_time(NVRAM, &tm); |
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} |
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break;
|
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case 0x1FFC: |
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/* day of the week / century */
|
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tmp = fromBCD(val & 0x07);
|
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get_time(NVRAM, &tm); |
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tm.tm_wday = tmp; |
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set_time(NVRAM, &tm); |
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NVRAM->buffer[0x1FFC] = val & 0x40; |
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break;
|
| 302 |
case 0x1FFD: |
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/* date */
|
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tmp = fromBCD(val & 0x1F);
|
| 305 |
if (tmp != 0) { |
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get_time(NVRAM, &tm); |
| 307 |
tm.tm_mday = tmp; |
| 308 |
set_time(NVRAM, &tm); |
| 309 |
} |
| 310 |
break;
|
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case 0x1FFE: |
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/* month */
|
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tmp = fromBCD(val & 0x1F);
|
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if (tmp >= 1 && tmp <= 12) { |
| 315 |
get_time(NVRAM, &tm); |
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tm.tm_mon = tmp - 1;
|
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set_time(NVRAM, &tm); |
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} |
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break;
|
| 320 |
case 0x1FFF: |
| 321 |
/* year */
|
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tmp = fromBCD(val); |
| 323 |
if (tmp >= 0 && tmp <= 99) { |
| 324 |
get_time(NVRAM, &tm); |
| 325 |
tm.tm_year = fromBCD(val); |
| 326 |
set_time(NVRAM, &tm); |
| 327 |
} |
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break;
|
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default:
|
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/* Check lock registers state */
|
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if (NVRAM->addr >= 0x20 && NVRAM->addr <= 0x2F && (NVRAM->lock & 1)) |
| 332 |
break;
|
| 333 |
if (NVRAM->addr >= 0x30 && NVRAM->addr <= 0x3F && (NVRAM->lock & 2)) |
| 334 |
break;
|
| 335 |
if (NVRAM->addr < 0x1FF0 || |
| 336 |
(NVRAM->addr > 0x1FFF && NVRAM->addr < NVRAM->size)) {
|
| 337 |
NVRAM->buffer[NVRAM->addr] = val & 0xFF;
|
| 338 |
} |
| 339 |
break;
|
| 340 |
} |
| 341 |
} |
| 342 |
|
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uint32_t m48t59_read (m48t59_t *NVRAM) |
| 344 |
{
|
| 345 |
struct tm tm;
|
| 346 |
uint32_t retval = 0xFF;
|
| 347 |
|
| 348 |
switch (NVRAM->addr) {
|
| 349 |
case 0x1FF0: |
| 350 |
/* flags register */
|
| 351 |
goto do_read;
|
| 352 |
case 0x1FF1: |
| 353 |
/* unused */
|
| 354 |
retval = 0;
|
| 355 |
break;
|
| 356 |
case 0x1FF2: |
| 357 |
/* alarm seconds */
|
| 358 |
goto do_read;
|
| 359 |
case 0x1FF3: |
| 360 |
/* alarm minutes */
|
| 361 |
goto do_read;
|
| 362 |
case 0x1FF4: |
| 363 |
/* alarm hours */
|
| 364 |
goto do_read;
|
| 365 |
case 0x1FF5: |
| 366 |
/* alarm date */
|
| 367 |
goto do_read;
|
| 368 |
case 0x1FF6: |
| 369 |
/* interrupts */
|
| 370 |
goto do_read;
|
| 371 |
case 0x1FF7: |
| 372 |
/* A read resets the watchdog */
|
| 373 |
set_up_watchdog(NVRAM, NVRAM->buffer[0x1FF7]);
|
| 374 |
goto do_read;
|
| 375 |
case 0x1FF8: |
| 376 |
/* control */
|
| 377 |
goto do_read;
|
| 378 |
case 0x1FF9: |
| 379 |
/* seconds (BCD) */
|
| 380 |
get_time(NVRAM, &tm); |
| 381 |
retval = (NVRAM->buffer[0x1FF9] & 0x80) | toBCD(tm.tm_sec); |
| 382 |
break;
|
| 383 |
case 0x1FFA: |
| 384 |
/* minutes (BCD) */
|
| 385 |
get_time(NVRAM, &tm); |
| 386 |
retval = toBCD(tm.tm_min); |
| 387 |
break;
|
| 388 |
case 0x1FFB: |
| 389 |
/* hours (BCD) */
|
| 390 |
get_time(NVRAM, &tm); |
| 391 |
retval = toBCD(tm.tm_hour); |
| 392 |
break;
|
| 393 |
case 0x1FFC: |
| 394 |
/* day of the week / century */
|
| 395 |
get_time(NVRAM, &tm); |
| 396 |
retval = NVRAM->buffer[0x1FFC] | tm.tm_wday;
|
| 397 |
break;
|
| 398 |
case 0x1FFD: |
| 399 |
/* date */
|
| 400 |
get_time(NVRAM, &tm); |
| 401 |
retval = toBCD(tm.tm_mday); |
| 402 |
break;
|
| 403 |
case 0x1FFE: |
| 404 |
/* month */
|
| 405 |
get_time(NVRAM, &tm); |
| 406 |
retval = toBCD(tm.tm_mon + 1);
|
| 407 |
break;
|
| 408 |
case 0x1FFF: |
| 409 |
/* year */
|
| 410 |
get_time(NVRAM, &tm); |
| 411 |
retval = toBCD(tm.tm_year); |
| 412 |
break;
|
| 413 |
default:
|
| 414 |
/* Check lock registers state */
|
| 415 |
if (NVRAM->addr >= 0x20 && NVRAM->addr <= 0x2F && (NVRAM->lock & 1)) |
| 416 |
break;
|
| 417 |
if (NVRAM->addr >= 0x30 && NVRAM->addr <= 0x3F && (NVRAM->lock & 2)) |
| 418 |
break;
|
| 419 |
if (NVRAM->addr < 0x1FF0 || |
| 420 |
(NVRAM->addr > 0x1FFF && NVRAM->addr < NVRAM->size)) {
|
| 421 |
do_read:
|
| 422 |
retval = NVRAM->buffer[NVRAM->addr]; |
| 423 |
} |
| 424 |
break;
|
| 425 |
} |
| 426 |
if (NVRAM->addr > 0x1FF9 && NVRAM->addr < 0x2000) |
| 427 |
NVRAM_PRINTF("0x%08x <= 0x%08x\n", NVRAM->addr, retval);
|
| 428 |
|
| 429 |
return retval;
|
| 430 |
} |
| 431 |
|
| 432 |
void m48t59_set_addr (m48t59_t *NVRAM, uint32_t addr)
|
| 433 |
{
|
| 434 |
NVRAM->addr = addr; |
| 435 |
} |
| 436 |
|
| 437 |
void m48t59_toggle_lock (m48t59_t *NVRAM, int lock) |
| 438 |
{
|
| 439 |
NVRAM->lock ^= 1 << lock;
|
| 440 |
} |
| 441 |
|
| 442 |
/* IO access to NVRAM */
|
| 443 |
static void NVRAM_writeb (void *opaque, uint32_t addr, uint32_t val) |
| 444 |
{
|
| 445 |
m48t59_t *NVRAM = opaque; |
| 446 |
|
| 447 |
addr -= NVRAM->io_base; |
| 448 |
NVRAM_PRINTF("0x%08x => 0x%08x\n", addr, val);
|
| 449 |
switch (addr) {
|
| 450 |
case 0: |
| 451 |
NVRAM->addr &= ~0x00FF;
|
| 452 |
NVRAM->addr |= val; |
| 453 |
break;
|
| 454 |
case 1: |
| 455 |
NVRAM->addr &= ~0xFF00;
|
| 456 |
NVRAM->addr |= val << 8;
|
| 457 |
break;
|
| 458 |
case 3: |
| 459 |
m48t59_write(NVRAM, val); |
| 460 |
NVRAM->addr = 0x0000;
|
| 461 |
break;
|
| 462 |
default:
|
| 463 |
break;
|
| 464 |
} |
| 465 |
} |
| 466 |
|
| 467 |
static uint32_t NVRAM_readb (void *opaque, uint32_t addr) |
| 468 |
{
|
| 469 |
m48t59_t *NVRAM = opaque; |
| 470 |
uint32_t retval; |
| 471 |
|
| 472 |
addr -= NVRAM->io_base; |
| 473 |
switch (addr) {
|
| 474 |
case 3: |
| 475 |
retval = m48t59_read(NVRAM); |
| 476 |
break;
|
| 477 |
default:
|
| 478 |
retval = -1;
|
| 479 |
break;
|
| 480 |
} |
| 481 |
NVRAM_PRINTF("0x%08x <= 0x%08x\n", addr, retval);
|
| 482 |
|
| 483 |
return retval;
|
| 484 |
} |
| 485 |
|
| 486 |
/* Initialisation routine */
|
| 487 |
m48t59_t *m48t59_init (int IRQ, uint32_t io_base, uint16_t size)
|
| 488 |
{
|
| 489 |
m48t59_t *s; |
| 490 |
|
| 491 |
s = qemu_mallocz(sizeof(m48t59_t));
|
| 492 |
if (!s)
|
| 493 |
return NULL; |
| 494 |
s->buffer = qemu_mallocz(size); |
| 495 |
if (!s->buffer) {
|
| 496 |
qemu_free(s); |
| 497 |
return NULL; |
| 498 |
} |
| 499 |
s->IRQ = IRQ; |
| 500 |
s->size = size; |
| 501 |
s->io_base = io_base; |
| 502 |
s->addr = 0;
|
| 503 |
register_ioport_read(io_base, 0x04, 1, NVRAM_readb, s); |
| 504 |
register_ioport_write(io_base, 0x04, 1, NVRAM_writeb, s); |
| 505 |
s->alrm_timer = qemu_new_timer(vm_clock, &alarm_cb, s); |
| 506 |
s->wd_timer = qemu_new_timer(vm_clock, &watchdog_cb, s); |
| 507 |
s->lock = 0;
|
| 508 |
|
| 509 |
return s;
|
| 510 |
} |