| /* |
| * 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 "qemu/osdep.h" |
| #include "hw/sysbus.h" |
| #include "qemu/timer.h" |
| #include "qemu-common.h" |
| #include "qemu/main-loop.h" |
| #include "hw/ptimer.h" |
| |
| #include "hw/arm/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; |
| |
| #define TYPE_EXYNOS4210_PWM "exynos4210.pwm" |
| #define EXYNOS4210_PWM(obj) \ |
| OBJECT_CHECK(Exynos4210PWMState, (obj), TYPE_EXYNOS4210_PWM) |
| |
| typedef struct Exynos4210PWMState { |
| SysBusDevice parent_obj; |
| |
| 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, |
| .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, |
| .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 = EXYNOS4210_PWM(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 void exynos4210_pwm_init(Object *obj) |
| { |
| Exynos4210PWMState *s = EXYNOS4210_PWM(obj); |
| SysBusDevice *dev = SYS_BUS_DEVICE(obj); |
| 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, PTIMER_POLICY_DEFAULT); |
| s->timer[i].id = i; |
| s->timer[i].parent = s; |
| } |
| |
| memory_region_init_io(&s->iomem, obj, &exynos4210_pwm_ops, s, |
| "exynos4210-pwm", EXYNOS4210_PWM_REG_MEM_SIZE); |
| sysbus_init_mmio(dev, &s->iomem); |
| } |
| |
| static void exynos4210_pwm_class_init(ObjectClass *klass, void *data) |
| { |
| DeviceClass *dc = DEVICE_CLASS(klass); |
| |
| dc->reset = exynos4210_pwm_reset; |
| dc->vmsd = &vmstate_exynos4210_pwm_state; |
| } |
| |
| static const TypeInfo exynos4210_pwm_info = { |
| .name = TYPE_EXYNOS4210_PWM, |
| .parent = TYPE_SYS_BUS_DEVICE, |
| .instance_size = sizeof(Exynos4210PWMState), |
| .instance_init = exynos4210_pwm_init, |
| .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) |
