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-rw-r--r--hw/exynos4210_pwm.c422
1 files changed, 422 insertions, 0 deletions
diff --git a/hw/exynos4210_pwm.c b/hw/exynos4210_pwm.c
new file mode 100644
index 0000000000..6243e59c48
--- /dev/null
+++ b/hw/exynos4210_pwm.c
@@ -0,0 +1,422 @@
+/*
+ * 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, target_phys_addr_t 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, target_phys_addr_t 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 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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