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qemu-e2k/hw/timer/sh_timer.c

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/*
* SuperH Timer modules.
*
* Copyright (c) 2007 Magnus Damm
* Based on arm_timer.c by Paul Brook
* Copyright (c) 2005-2006 CodeSourcery.
*
* This code is licensed under the GPL.
*/
#include "qemu/osdep.h"
#include "hw/hw.h"
#include "hw/sh4/sh.h"
#include "qemu/timer.h"
#include "qemu/main-loop.h"
#include "exec/address-spaces.h"
#include "hw/ptimer.h"
//#define DEBUG_TIMER
#define TIMER_TCR_TPSC (7 << 0)
#define TIMER_TCR_CKEG (3 << 3)
#define TIMER_TCR_UNIE (1 << 5)
#define TIMER_TCR_ICPE (3 << 6)
#define TIMER_TCR_UNF (1 << 8)
#define TIMER_TCR_ICPF (1 << 9)
#define TIMER_TCR_RESERVED (0x3f << 10)
#define TIMER_FEAT_CAPT (1 << 0)
#define TIMER_FEAT_EXTCLK (1 << 1)
#define OFFSET_TCOR 0
#define OFFSET_TCNT 1
#define OFFSET_TCR 2
#define OFFSET_TCPR 3
typedef struct {
ptimer_state *timer;
uint32_t tcnt;
uint32_t tcor;
uint32_t tcr;
uint32_t tcpr;
int freq;
int int_level;
int old_level;
int feat;
int enabled;
qemu_irq irq;
} sh_timer_state;
/* Check all active timers, and schedule the next timer interrupt. */
static void sh_timer_update(sh_timer_state *s)
{
int new_level = s->int_level && (s->tcr & TIMER_TCR_UNIE);
if (new_level != s->old_level)
qemu_set_irq (s->irq, new_level);
s->old_level = s->int_level;
s->int_level = new_level;
}
static uint32_t sh_timer_read(void *opaque, hwaddr offset)
{
sh_timer_state *s = (sh_timer_state *)opaque;
switch (offset >> 2) {
case OFFSET_TCOR:
return s->tcor;
case OFFSET_TCNT:
return ptimer_get_count(s->timer);
case OFFSET_TCR:
return s->tcr | (s->int_level ? TIMER_TCR_UNF : 0);
case OFFSET_TCPR:
if (s->feat & TIMER_FEAT_CAPT)
return s->tcpr;
default:
hw_error("sh_timer_read: Bad offset %x\n", (int)offset);
return 0;
}
}
static void sh_timer_write(void *opaque, hwaddr offset,
uint32_t value)
{
sh_timer_state *s = (sh_timer_state *)opaque;
int freq;
switch (offset >> 2) {
case OFFSET_TCOR:
s->tcor = value;
ptimer_set_limit(s->timer, s->tcor, 0);
break;
case OFFSET_TCNT:
s->tcnt = value;
ptimer_set_count(s->timer, s->tcnt);
break;
case OFFSET_TCR:
if (s->enabled) {
/* Pause the timer if it is running. This may cause some
inaccuracy dure to rounding, but avoids a whole lot of other
messyness. */
ptimer_stop(s->timer);
}
freq = s->freq;
/* ??? Need to recalculate expiry time after changing divisor. */
switch (value & TIMER_TCR_TPSC) {
case 0: freq >>= 2; break;
case 1: freq >>= 4; break;
case 2: freq >>= 6; break;
case 3: freq >>= 8; break;
case 4: freq >>= 10; break;
case 6:
case 7: if (s->feat & TIMER_FEAT_EXTCLK) break;
default: hw_error("sh_timer_write: Reserved TPSC value\n"); break;
}
switch ((value & TIMER_TCR_CKEG) >> 3) {
case 0: break;
case 1:
case 2:
case 3: if (s->feat & TIMER_FEAT_EXTCLK) break;
default: hw_error("sh_timer_write: Reserved CKEG value\n"); break;
}
switch ((value & TIMER_TCR_ICPE) >> 6) {
case 0: break;
case 2:
case 3: if (s->feat & TIMER_FEAT_CAPT) break;
default: hw_error("sh_timer_write: Reserved ICPE value\n"); break;
}
if ((value & TIMER_TCR_UNF) == 0)
s->int_level = 0;
value &= ~TIMER_TCR_UNF;
if ((value & TIMER_TCR_ICPF) && (!(s->feat & TIMER_FEAT_CAPT)))
hw_error("sh_timer_write: Reserved ICPF value\n");
value &= ~TIMER_TCR_ICPF; /* capture not supported */
if (value & TIMER_TCR_RESERVED)
hw_error("sh_timer_write: Reserved TCR bits set\n");
s->tcr = value;
ptimer_set_limit(s->timer, s->tcor, 0);
ptimer_set_freq(s->timer, freq);
if (s->enabled) {
/* Restart the timer if still enabled. */
ptimer_run(s->timer, 0);
}
break;
case OFFSET_TCPR:
if (s->feat & TIMER_FEAT_CAPT) {
s->tcpr = value;
break;
}
default:
hw_error("sh_timer_write: Bad offset %x\n", (int)offset);
}
sh_timer_update(s);
}
static void sh_timer_start_stop(void *opaque, int enable)
{
sh_timer_state *s = (sh_timer_state *)opaque;
#ifdef DEBUG_TIMER
printf("sh_timer_start_stop %d (%d)\n", enable, s->enabled);
#endif
if (s->enabled && !enable) {
ptimer_stop(s->timer);
}
if (!s->enabled && enable) {
ptimer_run(s->timer, 0);
}
s->enabled = !!enable;
#ifdef DEBUG_TIMER
printf("sh_timer_start_stop done %d\n", s->enabled);
#endif
}
static void sh_timer_tick(void *opaque)
{
sh_timer_state *s = (sh_timer_state *)opaque;
s->int_level = s->enabled;
sh_timer_update(s);
}
static void *sh_timer_init(uint32_t freq, int feat, qemu_irq irq)
{
sh_timer_state *s;
QEMUBH *bh;
s = (sh_timer_state *)g_malloc0(sizeof(sh_timer_state));
s->freq = freq;
s->feat = feat;
s->tcor = 0xffffffff;
s->tcnt = 0xffffffff;
s->tcpr = 0xdeadbeef;
s->tcr = 0;
s->enabled = 0;
s->irq = irq;
bh = qemu_bh_new(sh_timer_tick, s);
s->timer = ptimer_init(bh, PTIMER_POLICY_DEFAULT);
sh_timer_write(s, OFFSET_TCOR >> 2, s->tcor);
sh_timer_write(s, OFFSET_TCNT >> 2, s->tcnt);
sh_timer_write(s, OFFSET_TCPR >> 2, s->tcpr);
sh_timer_write(s, OFFSET_TCR >> 2, s->tcpr);
/* ??? Save/restore. */
return s;
}
typedef struct {
MemoryRegion iomem;
MemoryRegion iomem_p4;
MemoryRegion iomem_a7;
void *timer[3];
int level[3];
uint32_t tocr;
uint32_t tstr;
int feat;
} tmu012_state;
static uint64_t tmu012_read(void *opaque, hwaddr offset,
unsigned size)
{
tmu012_state *s = (tmu012_state *)opaque;
#ifdef DEBUG_TIMER
printf("tmu012_read 0x%lx\n", (unsigned long) offset);
#endif
if (offset >= 0x20) {
if (!(s->feat & TMU012_FEAT_3CHAN))
hw_error("tmu012_write: Bad channel offset %x\n", (int)offset);
return sh_timer_read(s->timer[2], offset - 0x20);
}
if (offset >= 0x14)
return sh_timer_read(s->timer[1], offset - 0x14);
if (offset >= 0x08)
return sh_timer_read(s->timer[0], offset - 0x08);
if (offset == 4)
return s->tstr;
if ((s->feat & TMU012_FEAT_TOCR) && offset == 0)
return s->tocr;
hw_error("tmu012_write: Bad offset %x\n", (int)offset);
return 0;
}
static void tmu012_write(void *opaque, hwaddr offset,
uint64_t value, unsigned size)
{
tmu012_state *s = (tmu012_state *)opaque;
#ifdef DEBUG_TIMER
printf("tmu012_write 0x%lx 0x%08x\n", (unsigned long) offset, value);
#endif
if (offset >= 0x20) {
if (!(s->feat & TMU012_FEAT_3CHAN))
hw_error("tmu012_write: Bad channel offset %x\n", (int)offset);
sh_timer_write(s->timer[2], offset - 0x20, value);
return;
}
if (offset >= 0x14) {
sh_timer_write(s->timer[1], offset - 0x14, value);
return;
}
if (offset >= 0x08) {
sh_timer_write(s->timer[0], offset - 0x08, value);
return;
}
if (offset == 4) {
sh_timer_start_stop(s->timer[0], value & (1 << 0));
sh_timer_start_stop(s->timer[1], value & (1 << 1));
if (s->feat & TMU012_FEAT_3CHAN)
sh_timer_start_stop(s->timer[2], value & (1 << 2));
else
if (value & (1 << 2))
hw_error("tmu012_write: Bad channel\n");
s->tstr = value;
return;
}
if ((s->feat & TMU012_FEAT_TOCR) && offset == 0) {
s->tocr = value & (1 << 0);
}
}
static const MemoryRegionOps tmu012_ops = {
.read = tmu012_read,
.write = tmu012_write,
.endianness = DEVICE_NATIVE_ENDIAN,
};
void tmu012_init(MemoryRegion *sysmem, hwaddr base,
int feat, uint32_t freq,
qemu_irq ch0_irq, qemu_irq ch1_irq,
qemu_irq ch2_irq0, qemu_irq ch2_irq1)
{
tmu012_state *s;
int timer_feat = (feat & TMU012_FEAT_EXTCLK) ? TIMER_FEAT_EXTCLK : 0;
s = (tmu012_state *)g_malloc0(sizeof(tmu012_state));
s->feat = feat;
s->timer[0] = sh_timer_init(freq, timer_feat, ch0_irq);
s->timer[1] = sh_timer_init(freq, timer_feat, ch1_irq);
if (feat & TMU012_FEAT_3CHAN)
s->timer[2] = sh_timer_init(freq, timer_feat | TIMER_FEAT_CAPT,
ch2_irq0); /* ch2_irq1 not supported */
memory_region_init_io(&s->iomem, NULL, &tmu012_ops, s,
"timer", 0x100000000ULL);
memory_region_init_alias(&s->iomem_p4, NULL, "timer-p4",
&s->iomem, 0, 0x1000);
memory_region_add_subregion(sysmem, P4ADDR(base), &s->iomem_p4);
memory_region_init_alias(&s->iomem_a7, NULL, "timer-a7",
&s->iomem, 0, 0x1000);
memory_region_add_subregion(sysmem, A7ADDR(base), &s->iomem_a7);
/* ??? Save/restore. */
}
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