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qemu-e2k/hw/exynos4210_pwm.c

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/*
* Samsung exynos4210 Pulse Width Modulation Timer
*
* Copyright (c) 2000 - 2011 Samsung Electronics Co., Ltd.
* All rights reserved.
*
* Evgeny Voevodin <e.voevodin@samsung.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "sysbus.h"
#include "qemu/timer.h"
#include "qemu-common.h"
#include "ptimer.h"
#include "exynos4210.h"
//#define DEBUG_PWM
#ifdef DEBUG_PWM
#define DPRINTF(fmt, ...) \
do { fprintf(stdout, "PWM: [%24s:%5d] " fmt, __func__, __LINE__, \
## __VA_ARGS__); } while (0)
#else
#define DPRINTF(fmt, ...) do {} while (0)
#endif
#define EXYNOS4210_PWM_TIMERS_NUM 5
#define EXYNOS4210_PWM_REG_MEM_SIZE 0x50
#define TCFG0 0x0000
#define TCFG1 0x0004
#define TCON 0x0008
#define TCNTB0 0x000C
#define TCMPB0 0x0010
#define TCNTO0 0x0014
#define TCNTB1 0x0018
#define TCMPB1 0x001C
#define TCNTO1 0x0020
#define TCNTB2 0x0024
#define TCMPB2 0x0028
#define TCNTO2 0x002C
#define TCNTB3 0x0030
#define TCMPB3 0x0034
#define TCNTO3 0x0038
#define TCNTB4 0x003C
#define TCNTO4 0x0040
#define TINT_CSTAT 0x0044
#define TCNTB(x) (0xC * (x))
#define TCMPB(x) (0xC * (x) + 1)
#define TCNTO(x) (0xC * (x) + 2)
#define GET_PRESCALER(reg, x) (((reg) & (0xFF << (8 * (x)))) >> 8 * (x))
#define GET_DIVIDER(reg, x) (1 << (((reg) & (0xF << (4 * (x)))) >> (4 * (x))))
/*
* Attention! Timer4 doesn't have OUTPUT_INVERTER,
* so Auto Reload bit is not accessible by macros!
*/
#define TCON_TIMER_BASE(x) (((x) ? 1 : 0) * 4 + 4 * (x))
#define TCON_TIMER_START(x) (1 << (TCON_TIMER_BASE(x) + 0))
#define TCON_TIMER_MANUAL_UPD(x) (1 << (TCON_TIMER_BASE(x) + 1))
#define TCON_TIMER_OUTPUT_INV(x) (1 << (TCON_TIMER_BASE(x) + 2))
#define TCON_TIMER_AUTO_RELOAD(x) (1 << (TCON_TIMER_BASE(x) + 3))
#define TCON_TIMER4_AUTO_RELOAD (1 << 22)
#define TINT_CSTAT_STATUS(x) (1 << (5 + (x)))
#define TINT_CSTAT_ENABLE(x) (1 << (x))
/* timer struct */
typedef struct {
uint32_t id; /* timer id */
qemu_irq irq; /* local timer irq */
uint32_t freq; /* timer frequency */
/* use ptimer.c to represent count down timer */
ptimer_state *ptimer; /* timer */
/* registers */
uint32_t reg_tcntb; /* counter register buffer */
uint32_t reg_tcmpb; /* compare register buffer */
struct Exynos4210PWMState *parent;
} Exynos4210PWM;
typedef struct Exynos4210PWMState {
SysBusDevice busdev;
MemoryRegion iomem;
uint32_t reg_tcfg[2];
uint32_t reg_tcon;
uint32_t reg_tint_cstat;
Exynos4210PWM timer[EXYNOS4210_PWM_TIMERS_NUM];
} Exynos4210PWMState;
/*** VMState ***/
static const VMStateDescription vmstate_exynos4210_pwm = {
.name = "exynos4210.pwm.pwm",
.version_id = 1,
.minimum_version_id = 1,
.minimum_version_id_old = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT32(id, Exynos4210PWM),
VMSTATE_UINT32(freq, Exynos4210PWM),
VMSTATE_PTIMER(ptimer, Exynos4210PWM),
VMSTATE_UINT32(reg_tcntb, Exynos4210PWM),
VMSTATE_UINT32(reg_tcmpb, Exynos4210PWM),
VMSTATE_END_OF_LIST()
}
};
static const VMStateDescription vmstate_exynos4210_pwm_state = {
.name = "exynos4210.pwm",
.version_id = 1,
.minimum_version_id = 1,
.minimum_version_id_old = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT32_ARRAY(reg_tcfg, Exynos4210PWMState, 2),
VMSTATE_UINT32(reg_tcon, Exynos4210PWMState),
VMSTATE_UINT32(reg_tint_cstat, Exynos4210PWMState),
VMSTATE_STRUCT_ARRAY(timer, Exynos4210PWMState,
EXYNOS4210_PWM_TIMERS_NUM, 0,
vmstate_exynos4210_pwm, Exynos4210PWM),
VMSTATE_END_OF_LIST()
}
};
/*
* PWM update frequency
*/
static void exynos4210_pwm_update_freq(Exynos4210PWMState *s, uint32_t id)
{
uint32_t freq;
freq = s->timer[id].freq;
if (id > 1) {
s->timer[id].freq = 24000000 /
((GET_PRESCALER(s->reg_tcfg[0], 1) + 1) *
(GET_DIVIDER(s->reg_tcfg[1], id)));
} else {
s->timer[id].freq = 24000000 /
((GET_PRESCALER(s->reg_tcfg[0], 0) + 1) *
(GET_DIVIDER(s->reg_tcfg[1], id)));
}
if (freq != s->timer[id].freq) {
ptimer_set_freq(s->timer[id].ptimer, s->timer[id].freq);
DPRINTF("freq=%dHz\n", s->timer[id].freq);
}
}
/*
* Counter tick handler
*/
static void exynos4210_pwm_tick(void *opaque)
{
Exynos4210PWM *s = (Exynos4210PWM *)opaque;
Exynos4210PWMState *p = (Exynos4210PWMState *)s->parent;
uint32_t id = s->id;
bool cmp;
DPRINTF("timer %d tick\n", id);
/* set irq status */
p->reg_tint_cstat |= TINT_CSTAT_STATUS(id);
/* raise IRQ */
if (p->reg_tint_cstat & TINT_CSTAT_ENABLE(id)) {
DPRINTF("timer %d IRQ\n", id);
qemu_irq_raise(p->timer[id].irq);
}
/* reload timer */
if (id != 4) {
cmp = p->reg_tcon & TCON_TIMER_AUTO_RELOAD(id);
} else {
cmp = p->reg_tcon & TCON_TIMER4_AUTO_RELOAD;
}
if (cmp) {
DPRINTF("auto reload timer %d count to %x\n", id,
p->timer[id].reg_tcntb);
ptimer_set_count(p->timer[id].ptimer, p->timer[id].reg_tcntb);
ptimer_run(p->timer[id].ptimer, 1);
} else {
/* stop timer, set status to STOP, see Basic Timer Operation */
p->reg_tcon &= ~TCON_TIMER_START(id);
ptimer_stop(p->timer[id].ptimer);
}
}
/*
* PWM Read
*/
static uint64_t exynos4210_pwm_read(void *opaque, hwaddr offset,
unsigned size)
{
Exynos4210PWMState *s = (Exynos4210PWMState *)opaque;
uint32_t value = 0;
int index;
switch (offset) {
case TCFG0: case TCFG1:
index = (offset - TCFG0) >> 2;
value = s->reg_tcfg[index];
break;
case TCON:
value = s->reg_tcon;
break;
case TCNTB0: case TCNTB1:
case TCNTB2: case TCNTB3: case TCNTB4:
index = (offset - TCNTB0) / 0xC;
value = s->timer[index].reg_tcntb;
break;
case TCMPB0: case TCMPB1:
case TCMPB2: case TCMPB3:
index = (offset - TCMPB0) / 0xC;
value = s->timer[index].reg_tcmpb;
break;
case TCNTO0: case TCNTO1:
case TCNTO2: case TCNTO3: case TCNTO4:
index = (offset == TCNTO4) ? 4 : (offset - TCNTO0) / 0xC;
value = ptimer_get_count(s->timer[index].ptimer);
break;
case TINT_CSTAT:
value = s->reg_tint_cstat;
break;
default:
fprintf(stderr,
"[exynos4210.pwm: bad read offset " TARGET_FMT_plx "]\n",
offset);
break;
}
return value;
}
/*
* PWM Write
*/
static void exynos4210_pwm_write(void *opaque, hwaddr offset,
uint64_t value, unsigned size)
{
Exynos4210PWMState *s = (Exynos4210PWMState *)opaque;
int index;
uint32_t new_val;
int i;
switch (offset) {
case TCFG0: case TCFG1:
index = (offset - TCFG0) >> 2;
s->reg_tcfg[index] = value;
/* update timers frequencies */
for (i = 0; i < EXYNOS4210_PWM_TIMERS_NUM; i++) {
exynos4210_pwm_update_freq(s, s->timer[i].id);
}
break;
case TCON:
for (i = 0; i < EXYNOS4210_PWM_TIMERS_NUM; i++) {
if ((value & TCON_TIMER_MANUAL_UPD(i)) >
(s->reg_tcon & TCON_TIMER_MANUAL_UPD(i))) {
/*
* TCNTB and TCMPB are loaded into TCNT and TCMP.
* Update timers.
*/
/* this will start timer to run, this ok, because
* during processing start bit timer will be stopped
* if needed */
ptimer_set_count(s->timer[i].ptimer, s->timer[i].reg_tcntb);
DPRINTF("set timer %d count to %x\n", i,
s->timer[i].reg_tcntb);
}
if ((value & TCON_TIMER_START(i)) >
(s->reg_tcon & TCON_TIMER_START(i))) {
/* changed to start */
ptimer_run(s->timer[i].ptimer, 1);
DPRINTF("run timer %d\n", i);
}
if ((value & TCON_TIMER_START(i)) <
(s->reg_tcon & TCON_TIMER_START(i))) {
/* changed to stop */
ptimer_stop(s->timer[i].ptimer);
DPRINTF("stop timer %d\n", i);
}
}
s->reg_tcon = value;
break;
case TCNTB0: case TCNTB1:
case TCNTB2: case TCNTB3: case TCNTB4:
index = (offset - TCNTB0) / 0xC;
s->timer[index].reg_tcntb = value;
break;
case TCMPB0: case TCMPB1:
case TCMPB2: case TCMPB3:
index = (offset - TCMPB0) / 0xC;
s->timer[index].reg_tcmpb = value;
break;
case TINT_CSTAT:
new_val = (s->reg_tint_cstat & 0x3E0) + (0x1F & value);
new_val &= ~(0x3E0 & value);
for (i = 0; i < EXYNOS4210_PWM_TIMERS_NUM; i++) {
if ((new_val & TINT_CSTAT_STATUS(i)) <
(s->reg_tint_cstat & TINT_CSTAT_STATUS(i))) {
qemu_irq_lower(s->timer[i].irq);
}
}
s->reg_tint_cstat = new_val;
break;
default:
fprintf(stderr,
"[exynos4210.pwm: bad write offset " TARGET_FMT_plx "]\n",
offset);
break;
}
}
/*
* Set default values to timer fields and registers
*/
static void exynos4210_pwm_reset(DeviceState *d)
{
Exynos4210PWMState *s = (Exynos4210PWMState *)d;
int i;
s->reg_tcfg[0] = 0x0101;
s->reg_tcfg[1] = 0x0;
s->reg_tcon = 0;
s->reg_tint_cstat = 0;
for (i = 0; i < EXYNOS4210_PWM_TIMERS_NUM; i++) {
s->timer[i].reg_tcmpb = 0;
s->timer[i].reg_tcntb = 0;
exynos4210_pwm_update_freq(s, s->timer[i].id);
ptimer_stop(s->timer[i].ptimer);
}
}
static const MemoryRegionOps exynos4210_pwm_ops = {
.read = exynos4210_pwm_read,
.write = exynos4210_pwm_write,
.endianness = DEVICE_NATIVE_ENDIAN,
};
/*
* PWM timer initialization
*/
static int exynos4210_pwm_init(SysBusDevice *dev)
{
Exynos4210PWMState *s = FROM_SYSBUS(Exynos4210PWMState, dev);
int i;
QEMUBH *bh;
for (i = 0; i < EXYNOS4210_PWM_TIMERS_NUM; i++) {
bh = qemu_bh_new(exynos4210_pwm_tick, &s->timer[i]);
sysbus_init_irq(dev, &s->timer[i].irq);
s->timer[i].ptimer = ptimer_init(bh);
s->timer[i].id = i;
s->timer[i].parent = s;
}
memory_region_init_io(&s->iomem, &exynos4210_pwm_ops, s, "exynos4210-pwm",
EXYNOS4210_PWM_REG_MEM_SIZE);
sysbus_init_mmio(dev, &s->iomem);
return 0;
}
static void exynos4210_pwm_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
k->init = exynos4210_pwm_init;
dc->reset = exynos4210_pwm_reset;
dc->vmsd = &vmstate_exynos4210_pwm_state;
}
static const TypeInfo exynos4210_pwm_info = {
.name = "exynos4210.pwm",
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(Exynos4210PWMState),
.class_init = exynos4210_pwm_class_init,
};
static void exynos4210_pwm_register_types(void)
{
type_register_static(&exynos4210_pwm_info);
}
type_init(exynos4210_pwm_register_types)
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