13ab5daa86
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@815 c046a42c-6fe2-441c-8c8c-71466251a162
503 lines
12 KiB
C
503 lines
12 KiB
C
/*
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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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/* 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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/* 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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t = time(NULL) + NVRAM->time_offset;
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localtime_r(&t, tm);
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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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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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/* 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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localtime_r(&NVRAM->alarm, tm);
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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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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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/* 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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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;
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case 0x1FFD:
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/* date */
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tmp = fromBCD(val & 0x1F);
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if (tmp != 0) {
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get_time(NVRAM, &tm);
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tm.tm_mday = tmp;
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set_time(NVRAM, &tm);
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}
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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) {
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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;
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case 0x1FFF:
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/* year */
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tmp = fromBCD(val);
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if (tmp >= 0 && tmp <= 99) {
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get_time(NVRAM, &tm);
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tm.tm_year = fromBCD(val);
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set_time(NVRAM, &tm);
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}
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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))
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break;
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if (NVRAM->addr >= 0x30 && NVRAM->addr <= 0x3F && (NVRAM->lock & 2))
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break;
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if (NVRAM->addr < 0x1FF0 ||
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(NVRAM->addr > 0x1FFF && NVRAM->addr < NVRAM->size)) {
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NVRAM->buffer[NVRAM->addr] = val & 0xFF;
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}
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break;
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}
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}
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uint32_t m48t59_read (m48t59_t *NVRAM)
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{
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struct tm tm;
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uint32_t retval = 0xFF;
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switch (NVRAM->addr) {
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case 0x1FF0:
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/* flags register */
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goto do_read;
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case 0x1FF1:
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/* unused */
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retval = 0;
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break;
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case 0x1FF2:
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/* alarm seconds */
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goto do_read;
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case 0x1FF3:
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/* alarm minutes */
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goto do_read;
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case 0x1FF4:
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/* alarm hours */
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goto do_read;
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case 0x1FF5:
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/* alarm date */
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goto do_read;
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case 0x1FF6:
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/* interrupts */
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goto do_read;
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case 0x1FF7:
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/* A read resets the watchdog */
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set_up_watchdog(NVRAM, NVRAM->buffer[0x1FF7]);
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goto do_read;
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case 0x1FF8:
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/* control */
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goto do_read;
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case 0x1FF9:
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/* seconds (BCD) */
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get_time(NVRAM, &tm);
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retval = (NVRAM->buffer[0x1FF9] & 0x80) | toBCD(tm.tm_sec);
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break;
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case 0x1FFA:
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/* minutes (BCD) */
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get_time(NVRAM, &tm);
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retval = toBCD(tm.tm_min);
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break;
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case 0x1FFB:
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/* hours (BCD) */
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get_time(NVRAM, &tm);
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retval = toBCD(tm.tm_hour);
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break;
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case 0x1FFC:
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/* day of the week / century */
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get_time(NVRAM, &tm);
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retval = NVRAM->buffer[0x1FFC] | tm.tm_wday;
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break;
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case 0x1FFD:
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/* date */
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get_time(NVRAM, &tm);
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retval = toBCD(tm.tm_mday);
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break;
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case 0x1FFE:
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/* month */
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get_time(NVRAM, &tm);
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retval = toBCD(tm.tm_mon + 1);
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break;
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case 0x1FFF:
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/* year */
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get_time(NVRAM, &tm);
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retval = toBCD(tm.tm_year);
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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))
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break;
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if (NVRAM->addr >= 0x30 && NVRAM->addr <= 0x3F && (NVRAM->lock & 2))
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break;
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if (NVRAM->addr < 0x1FF0 ||
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(NVRAM->addr > 0x1FFF && NVRAM->addr < NVRAM->size)) {
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do_read:
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retval = NVRAM->buffer[NVRAM->addr];
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}
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break;
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}
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if (NVRAM->addr > 0x1FF9 && NVRAM->addr < 0x2000)
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NVRAM_PRINTF("0x%08x <= 0x%08x\n", NVRAM->addr, retval);
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return retval;
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}
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void m48t59_set_addr (m48t59_t *NVRAM, uint32_t addr)
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{
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NVRAM->addr = addr;
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}
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void m48t59_toggle_lock (m48t59_t *NVRAM, int lock)
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{
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NVRAM->lock ^= 1 << lock;
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}
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/* IO access to NVRAM */
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static void NVRAM_writeb (void *opaque, uint32_t addr, uint32_t val)
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{
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m48t59_t *NVRAM = opaque;
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addr -= NVRAM->io_base;
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NVRAM_PRINTF("0x%08x => 0x%08x\n", addr, val);
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switch (addr) {
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case 0:
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NVRAM->addr &= ~0x00FF;
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NVRAM->addr |= val;
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break;
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case 1:
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NVRAM->addr &= ~0xFF00;
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NVRAM->addr |= val << 8;
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break;
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case 3:
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m48t59_write(NVRAM, val);
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NVRAM->addr = 0x0000;
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break;
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default:
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break;
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}
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}
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static uint32_t NVRAM_readb (void *opaque, uint32_t addr)
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{
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m48t59_t *NVRAM = opaque;
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uint32_t retval;
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addr -= NVRAM->io_base;
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switch (addr) {
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case 3:
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retval = m48t59_read(NVRAM);
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break;
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default:
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retval = -1;
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break;
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}
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NVRAM_PRINTF("0x%08x <= 0x%08x\n", addr, retval);
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return retval;
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}
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/* Initialisation routine */
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m48t59_t *m48t59_init (int IRQ, uint32_t io_base, uint16_t size)
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{
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m48t59_t *s;
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s = qemu_mallocz(sizeof(m48t59_t));
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if (!s)
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return NULL;
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s->buffer = qemu_mallocz(size);
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if (!s->buffer) {
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qemu_free(s);
|
|
return NULL;
|
|
}
|
|
s->IRQ = IRQ;
|
|
s->size = size;
|
|
s->io_base = io_base;
|
|
s->addr = 0;
|
|
register_ioport_read(io_base, 0x04, 1, NVRAM_readb, s);
|
|
register_ioport_write(io_base, 0x04, 1, NVRAM_writeb, s);
|
|
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;
|
|
}
|