mirror of
https://github.com/gwenhael-le-moine/x49gp.git
synced 2024-12-25 21:58:49 +01:00
379 lines
7.9 KiB
C
379 lines
7.9 KiB
C
/* $Id: s3c2410_watchdog.c,v 1.5 2008/12/11 12:18:17 ecd Exp $
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*/
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <errno.h>
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#include <x49gp.h>
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#include <s3c2410.h>
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#include <s3c2410_intc.h>
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typedef struct {
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uint32_t wtcon;
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uint32_t wtdat;
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uint32_t wtcnt;
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unsigned int nr_regs;
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s3c2410_offset_t *regs;
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x49gp_t *x49gp;
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unsigned long interval;
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x49gp_timer_t *timer;
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} s3c2410_watchdog_t;
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static int
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s3c2410_watchdog_data_init(s3c2410_watchdog_t *watchdog)
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{
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s3c2410_offset_t regs[] = {
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S3C2410_OFFSET(WATCHDOG, WTCON, 0x8021, watchdog->wtcon),
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S3C2410_OFFSET(WATCHDOG, WTDAT, 0x8000, watchdog->wtdat),
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S3C2410_OFFSET(WATCHDOG, WTCNT, 0x8000, watchdog->wtcnt)
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};
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memset(watchdog, 0, sizeof(s3c2410_watchdog_t));
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watchdog->regs = malloc(sizeof(regs));
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if (NULL == watchdog->regs) {
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fprintf(stderr, "%s:%u: Out of memory\n",
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__FUNCTION__, __LINE__);
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return -ENOMEM;
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}
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memcpy(watchdog->regs, regs, sizeof(regs));
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watchdog->nr_regs = sizeof(regs) / sizeof(regs[0]);
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return 0;
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}
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static void
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s3c2410_watchdog_tick(void *data)
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{
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s3c2410_watchdog_t *watchdog = data;
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x49gp_t *x49gp = watchdog->x49gp;
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if (watchdog->wtcnt > 0) {
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watchdog->wtcnt--;
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} else {
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watchdog->wtcnt = watchdog->wtdat;
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}
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if (watchdog->wtcnt > 0) {
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// watchdog->timer.expires += watchdog->interval;
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x49gp_mod_timer(watchdog->timer, x49gp_get_clock() + watchdog->interval);
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return;
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}
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if (watchdog->wtcon & 0x0004) {
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#ifdef DEBUG_S3C2410_WATCHDOG
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printf("WATCHDOG: assert WDT interrupt\n");
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#endif
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// g_mutex_lock(x49gp->memlock);
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s3c2410_intc_assert(x49gp, INT_WDT, 0);
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// g_mutex_unlock(x49gp->memlock);
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}
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if (watchdog->wtcon & 0x0001) {
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#ifdef DEBUG_S3C2410_WATCHDOG
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printf("WATCHDOG: assert internal RESET\n");
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#endif
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x49gp_modules_reset(x49gp, X49GP_RESET_WATCHDOG);
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cpu_reset(x49gp->env);
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// if (x49gp->arm->NresetSig != LOW) {
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// x49gp->arm->NresetSig = LOW;
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// x49gp->arm->Exception++;
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// }
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return;
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}
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// watchdog->timer.expires += watchdog->interval;
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x49gp_mod_timer(watchdog->timer, x49gp_get_clock() + watchdog->interval);
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}
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unsigned long
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s3c2410_watchdog_next_interrupt(x49gp_t *x49gp)
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{
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s3c2410_watchdog_t *watchdog = x49gp->s3c2410_watchdog;
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unsigned long irq;
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unsigned long ticks;
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ticks = x49gp_get_clock();
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if (!(watchdog->wtcon & 0x0020)) {
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return ~(0);
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}
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if (x49gp_timer_pending(watchdog->timer)) {
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irq = x49gp_timer_expires(watchdog->timer) - ticks;
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} else {
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irq = 0;
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}
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if (watchdog->wtcnt) {
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irq += (watchdog->wtcnt - 1) * watchdog->interval;
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} else {
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irq += watchdog->wtdat * watchdog->interval;
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}
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#ifdef DEBUG_S3C2410_WATCHDOG
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printf("WATCHDOG: wtcnt %u, interval %lu, expires %llu, next irq %lu\n",
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watchdog->wtcnt, watchdog->interval, (unsigned long long) (x49gp_timer_pending(watchdog->timer) ? x49gp_timer_expires(watchdog->timer) : 0), irq);
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#endif
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return irq;
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}
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static int
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s3c2410_watchdog_update(s3c2410_watchdog_t *watchdog)
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{
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uint32_t pre, mux;
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if (!(watchdog->wtcon & 0x0020)) {
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x49gp_del_timer(watchdog->timer);
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#ifdef DEBUG_S3C2410_WATCHDOG
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printf("WATCHDOG: stop timer\n");
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#endif
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return 0;
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}
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pre = (watchdog->wtcon >> 8) & 0xff;
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mux = (watchdog->wtcon >> 3) & 3;
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watchdog->interval = (pre + 1) * (16 << mux);
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#ifdef DEBUG_S3C2410_WATCHDOG
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printf("WATCHDOG: start tick (%lu PCLKs)\n", watchdog->interval);
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#endif
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x49gp_mod_timer(watchdog->timer, x49gp_get_clock() + watchdog->interval);
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return 0;
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}
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static uint32_t
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s3c2410_watchdog_read(void *opaque, target_phys_addr_t offset)
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{
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s3c2410_watchdog_t *watchdog = opaque;
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s3c2410_offset_t *reg;
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if (! S3C2410_OFFSET_OK(watchdog, offset)) {
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return ~(0);
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}
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reg = S3C2410_OFFSET_ENTRY(watchdog, offset);
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#ifdef DEBUG_S3C2410_WATCHDOG
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printf("read %s [%08x] %s [%08lx] data %08x\n",
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"s3c2410-watchdog", S3C2410_WATCHDOG_BASE,
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reg->name, (unsigned long) offset, *(reg->datap));
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#endif
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return *(reg->datap);
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}
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static void
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s3c2410_watchdog_write(void *opaque, target_phys_addr_t offset, uint32_t data)
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{
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s3c2410_watchdog_t *watchdog = opaque;
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s3c2410_offset_t *reg;
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if (! S3C2410_OFFSET_OK(watchdog, offset)) {
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return;
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}
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reg = S3C2410_OFFSET_ENTRY(watchdog, offset);
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#ifdef DEBUG_S3C2410_WATCHDOG
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printf("write %s [%08x] %s [%08lx] data %08x\n",
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"s3c2410-watchdog", S3C2410_WATCHDOG_BASE,
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reg->name, (unsigned long) offset, data);
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#endif
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*(reg->datap) = data;
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switch (offset) {
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case S3C2410_WATCHDOG_WTCON:
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case S3C2410_WATCHDOG_WTCNT:
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s3c2410_watchdog_update(watchdog);
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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 int
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s3c2410_watchdog_load(x49gp_module_t *module, GKeyFile *key)
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{
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s3c2410_watchdog_t *watchdog = module->user_data;
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s3c2410_offset_t *reg;
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int error = 0;
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int i;
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#ifdef DEBUG_X49GP_MODULES
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printf("%s: %s:%u\n", module->name, __FUNCTION__, __LINE__);
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#endif
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for (i = 0; i < watchdog->nr_regs; i++) {
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reg = &watchdog->regs[i];
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if (NULL == reg->name)
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continue;
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if (x49gp_module_get_u32(module, key, reg->name,
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reg->reset, reg->datap))
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error = -EAGAIN;
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}
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s3c2410_watchdog_update(watchdog);
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return error;
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}
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static int
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s3c2410_watchdog_save(x49gp_module_t *module, GKeyFile *key)
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{
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s3c2410_watchdog_t *watchdog = module->user_data;
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s3c2410_offset_t *reg;
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int i;
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#ifdef DEBUG_X49GP_MODULES
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printf("%s: %s:%u\n", module->name, __FUNCTION__, __LINE__);
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#endif
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for (i = 0; i < watchdog->nr_regs; i++) {
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reg = &watchdog->regs[i];
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if (NULL == reg->name)
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continue;
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x49gp_module_set_u32(module, key, reg->name, *(reg->datap));
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}
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return 0;
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}
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static int
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s3c2410_watchdog_reset(x49gp_module_t *module, x49gp_reset_t reset)
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{
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s3c2410_watchdog_t *watchdog = module->user_data;
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s3c2410_offset_t *reg;
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int i;
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#ifdef DEBUG_X49GP_MODULES
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printf("%s: %s:%u\n", module->name, __FUNCTION__, __LINE__);
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#endif
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for (i = 0; i < watchdog->nr_regs; i++) {
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reg = &watchdog->regs[i];
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if (NULL == reg->name)
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continue;
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*(reg->datap) = reg->reset;
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}
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s3c2410_watchdog_update(watchdog);
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return 0;
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}
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static CPUReadMemoryFunc *s3c2410_watchdog_readfn[] =
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{
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s3c2410_watchdog_read,
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s3c2410_watchdog_read,
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s3c2410_watchdog_read
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};
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static CPUWriteMemoryFunc *s3c2410_watchdog_writefn[] =
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{
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s3c2410_watchdog_write,
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s3c2410_watchdog_write,
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s3c2410_watchdog_write
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};
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static int
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s3c2410_watchdog_init(x49gp_module_t *module)
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{
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s3c2410_watchdog_t *watchdog;
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int iotype;
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#ifdef DEBUG_X49GP_MODULES
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printf("%s: %s:%u\n", module->name, __FUNCTION__, __LINE__);
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#endif
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watchdog = malloc(sizeof(s3c2410_watchdog_t));
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if (NULL == watchdog) {
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fprintf(stderr, "%s: %s:%u: Out of memory\n",
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module->x49gp->progname, __FUNCTION__, __LINE__);
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return -ENOMEM;
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}
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if (s3c2410_watchdog_data_init(watchdog)) {
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free(watchdog);
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return -ENOMEM;
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}
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module->user_data = watchdog;
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watchdog->x49gp = module->x49gp;
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module->x49gp->s3c2410_watchdog = watchdog;
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watchdog->timer = x49gp_new_timer(X49GP_TIMER_VIRTUAL,
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s3c2410_watchdog_tick, watchdog);
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iotype = cpu_register_io_memory(s3c2410_watchdog_readfn,
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s3c2410_watchdog_writefn, watchdog);
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#ifdef DEBUG_S3C2410_WATCHDOG
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printf("%s: iotype %08x\n", __FUNCTION__, iotype);
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#endif
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cpu_register_physical_memory(S3C2410_WATCHDOG_BASE, S3C2410_MAP_SIZE, iotype);
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return 0;
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}
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static int
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s3c2410_watchdog_exit(x49gp_module_t *module)
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{
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s3c2410_watchdog_t *watchdog;
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#ifdef DEBUG_X49GP_MODULES
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printf("%s: %s:%u\n", module->name, __FUNCTION__, __LINE__);
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#endif
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if (module->user_data) {
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watchdog = module->user_data;
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if (watchdog->regs)
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free(watchdog->regs);
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free(watchdog);
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}
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x49gp_module_unregister(module);
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free(module);
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return 0;
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}
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int
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x49gp_s3c2410_watchdog_init(x49gp_t *x49gp)
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{
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x49gp_module_t *module;
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if (x49gp_module_init(x49gp, "s3c2410-watchdog",
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s3c2410_watchdog_init,
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s3c2410_watchdog_exit,
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s3c2410_watchdog_reset,
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s3c2410_watchdog_load,
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s3c2410_watchdog_save,
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NULL, &module)) {
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return -1;
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}
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return x49gp_module_register(module);
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}
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