| /* |
| * IMX GPT Timer |
| * |
| * Copyright (c) 2008 OK Labs |
| * Copyright (c) 2011 NICTA Pty Ltd |
| * Originally written by Hans Jiang |
| * Updated by Peter Chubb |
| * Updated by Jean-Christophe Dubois |
| * |
| * This code is licensed under GPL version 2 or later. See |
| * the COPYING file in the top-level directory. |
| * |
| */ |
| |
| #include "hw/hw.h" |
| #include "qemu/bitops.h" |
| #include "qemu/timer.h" |
| #include "hw/ptimer.h" |
| #include "hw/sysbus.h" |
| #include "hw/arm/imx.h" |
| #include "qemu/main-loop.h" |
| |
| #define TYPE_IMX_GPT "imx.gpt" |
| |
| /* |
| * Define to 1 for debug messages |
| */ |
| #define DEBUG_TIMER 0 |
| #if DEBUG_TIMER |
| |
| static char const *imx_gpt_reg_name(uint32_t reg) |
| { |
| switch (reg) { |
| case 0: |
| return "CR"; |
| case 1: |
| return "PR"; |
| case 2: |
| return "SR"; |
| case 3: |
| return "IR"; |
| case 4: |
| return "OCR1"; |
| case 5: |
| return "OCR2"; |
| case 6: |
| return "OCR3"; |
| case 7: |
| return "ICR1"; |
| case 8: |
| return "ICR2"; |
| case 9: |
| return "CNT"; |
| default: |
| return "[?]"; |
| } |
| } |
| |
| # define DPRINTF(fmt, args...) \ |
| do { printf("%s: " fmt , __func__, ##args); } while (0) |
| #else |
| # define DPRINTF(fmt, args...) do {} while (0) |
| #endif |
| |
| /* |
| * Define to 1 for messages about attempts to |
| * access unimplemented registers or similar. |
| */ |
| #define DEBUG_IMPLEMENTATION 1 |
| #if DEBUG_IMPLEMENTATION |
| # define IPRINTF(fmt, args...) \ |
| do { fprintf(stderr, "%s: " fmt, __func__, ##args); } while (0) |
| #else |
| # define IPRINTF(fmt, args...) do {} while (0) |
| #endif |
| |
| #define IMX_GPT(obj) \ |
| OBJECT_CHECK(IMXGPTState, (obj), TYPE_IMX_GPT) |
| /* |
| * GPT : General purpose timer |
| * |
| * This timer counts up continuously while it is enabled, resetting itself |
| * to 0 when it reaches GPT_TIMER_MAX (in freerun mode) or when it |
| * reaches the value of one of the ocrX (in periodic mode). |
| */ |
| |
| #define GPT_TIMER_MAX 0XFFFFFFFFUL |
| |
| /* Control register. Not all of these bits have any effect (yet) */ |
| #define GPT_CR_EN (1 << 0) /* GPT Enable */ |
| #define GPT_CR_ENMOD (1 << 1) /* GPT Enable Mode */ |
| #define GPT_CR_DBGEN (1 << 2) /* GPT Debug mode enable */ |
| #define GPT_CR_WAITEN (1 << 3) /* GPT Wait Mode Enable */ |
| #define GPT_CR_DOZEN (1 << 4) /* GPT Doze mode enable */ |
| #define GPT_CR_STOPEN (1 << 5) /* GPT Stop Mode Enable */ |
| #define GPT_CR_CLKSRC_SHIFT (6) |
| #define GPT_CR_CLKSRC_MASK (0x7) |
| |
| #define GPT_CR_FRR (1 << 9) /* Freerun or Restart */ |
| #define GPT_CR_SWR (1 << 15) /* Software Reset */ |
| #define GPT_CR_IM1 (3 << 16) /* Input capture channel 1 mode (2 bits) */ |
| #define GPT_CR_IM2 (3 << 18) /* Input capture channel 2 mode (2 bits) */ |
| #define GPT_CR_OM1 (7 << 20) /* Output Compare Channel 1 Mode (3 bits) */ |
| #define GPT_CR_OM2 (7 << 23) /* Output Compare Channel 2 Mode (3 bits) */ |
| #define GPT_CR_OM3 (7 << 26) /* Output Compare Channel 3 Mode (3 bits) */ |
| #define GPT_CR_FO1 (1 << 29) /* Force Output Compare Channel 1 */ |
| #define GPT_CR_FO2 (1 << 30) /* Force Output Compare Channel 2 */ |
| #define GPT_CR_FO3 (1 << 31) /* Force Output Compare Channel 3 */ |
| |
| #define GPT_SR_OF1 (1 << 0) |
| #define GPT_SR_OF2 (1 << 1) |
| #define GPT_SR_OF3 (1 << 2) |
| #define GPT_SR_ROV (1 << 5) |
| |
| #define GPT_IR_OF1IE (1 << 0) |
| #define GPT_IR_OF2IE (1 << 1) |
| #define GPT_IR_OF3IE (1 << 2) |
| #define GPT_IR_ROVIE (1 << 5) |
| |
| typedef struct { |
| SysBusDevice busdev; |
| ptimer_state *timer; |
| MemoryRegion iomem; |
| DeviceState *ccm; |
| |
| uint32_t cr; |
| uint32_t pr; |
| uint32_t sr; |
| uint32_t ir; |
| uint32_t ocr1; |
| uint32_t ocr2; |
| uint32_t ocr3; |
| uint32_t icr1; |
| uint32_t icr2; |
| uint32_t cnt; |
| |
| uint32_t next_timeout; |
| uint32_t next_int; |
| |
| uint32_t freq; |
| |
| qemu_irq irq; |
| } IMXGPTState; |
| |
| static const VMStateDescription vmstate_imx_timer_gpt = { |
| .name = "imx.gpt", |
| .version_id = 3, |
| .minimum_version_id = 3, |
| .fields = (VMStateField[]) { |
| VMSTATE_UINT32(cr, IMXGPTState), |
| VMSTATE_UINT32(pr, IMXGPTState), |
| VMSTATE_UINT32(sr, IMXGPTState), |
| VMSTATE_UINT32(ir, IMXGPTState), |
| VMSTATE_UINT32(ocr1, IMXGPTState), |
| VMSTATE_UINT32(ocr2, IMXGPTState), |
| VMSTATE_UINT32(ocr3, IMXGPTState), |
| VMSTATE_UINT32(icr1, IMXGPTState), |
| VMSTATE_UINT32(icr2, IMXGPTState), |
| VMSTATE_UINT32(cnt, IMXGPTState), |
| VMSTATE_UINT32(next_timeout, IMXGPTState), |
| VMSTATE_UINT32(next_int, IMXGPTState), |
| VMSTATE_UINT32(freq, IMXGPTState), |
| VMSTATE_PTIMER(timer, IMXGPTState), |
| VMSTATE_END_OF_LIST() |
| } |
| }; |
| |
| static const IMXClk imx_gpt_clocks[] = { |
| NOCLK, /* 000 No clock source */ |
| IPG, /* 001 ipg_clk, 532MHz*/ |
| IPG, /* 010 ipg_clk_highfreq */ |
| NOCLK, /* 011 not defined */ |
| CLK_32k, /* 100 ipg_clk_32k */ |
| NOCLK, /* 101 not defined */ |
| NOCLK, /* 110 not defined */ |
| NOCLK, /* 111 not defined */ |
| }; |
| |
| static void imx_gpt_set_freq(IMXGPTState *s) |
| { |
| uint32_t clksrc = extract32(s->cr, GPT_CR_CLKSRC_SHIFT, 3); |
| uint32_t freq = imx_clock_frequency(s->ccm, imx_gpt_clocks[clksrc]) |
| / (1 + s->pr); |
| s->freq = freq; |
| |
| DPRINTF("Setting clksrc %d to frequency %d\n", clksrc, freq); |
| |
| if (freq) { |
| ptimer_set_freq(s->timer, freq); |
| } |
| } |
| |
| static void imx_gpt_update_int(IMXGPTState *s) |
| { |
| if ((s->sr & s->ir) && (s->cr & GPT_CR_EN)) { |
| qemu_irq_raise(s->irq); |
| } else { |
| qemu_irq_lower(s->irq); |
| } |
| } |
| |
| static uint32_t imx_gpt_update_count(IMXGPTState *s) |
| { |
| s->cnt = s->next_timeout - (uint32_t)ptimer_get_count(s->timer); |
| |
| return s->cnt; |
| } |
| |
| static inline uint32_t imx_gpt_find_limit(uint32_t count, uint32_t reg, |
| uint32_t timeout) |
| { |
| if ((count < reg) && (timeout > reg)) { |
| timeout = reg; |
| } |
| |
| return timeout; |
| } |
| |
| static void imx_gpt_compute_next_timeout(IMXGPTState *s, bool event) |
| { |
| uint32_t timeout = GPT_TIMER_MAX; |
| uint32_t count = 0; |
| long long limit; |
| |
| if (!(s->cr & GPT_CR_EN)) { |
| /* if not enabled just return */ |
| return; |
| } |
| |
| if (event) { |
| /* This is a timer event */ |
| |
| if ((s->cr & GPT_CR_FRR) && (s->next_timeout != GPT_TIMER_MAX)) { |
| /* |
| * if we are in free running mode and we have not reached |
| * the GPT_TIMER_MAX limit, then update the count |
| */ |
| count = imx_gpt_update_count(s); |
| } |
| } else { |
| /* not a timer event, then just update the count */ |
| |
| count = imx_gpt_update_count(s); |
| } |
| |
| /* now, find the next timeout related to count */ |
| |
| if (s->ir & GPT_IR_OF1IE) { |
| timeout = imx_gpt_find_limit(count, s->ocr1, timeout); |
| } |
| if (s->ir & GPT_IR_OF2IE) { |
| timeout = imx_gpt_find_limit(count, s->ocr2, timeout); |
| } |
| if (s->ir & GPT_IR_OF3IE) { |
| timeout = imx_gpt_find_limit(count, s->ocr3, timeout); |
| } |
| |
| /* find the next set of interrupts to raise for next timer event */ |
| |
| s->next_int = 0; |
| if ((s->ir & GPT_IR_OF1IE) && (timeout == s->ocr1)) { |
| s->next_int |= GPT_SR_OF1; |
| } |
| if ((s->ir & GPT_IR_OF2IE) && (timeout == s->ocr2)) { |
| s->next_int |= GPT_SR_OF2; |
| } |
| if ((s->ir & GPT_IR_OF3IE) && (timeout == s->ocr3)) { |
| s->next_int |= GPT_SR_OF3; |
| } |
| if ((s->ir & GPT_IR_ROVIE) && (timeout == GPT_TIMER_MAX)) { |
| s->next_int |= GPT_SR_ROV; |
| } |
| |
| /* the new range to count down from */ |
| limit = timeout - imx_gpt_update_count(s); |
| |
| if (limit < 0) { |
| /* |
| * if we reach here, then QEMU is running too slow and we pass the |
| * timeout limit while computing it. Let's deliver the interrupt |
| * and compute a new limit. |
| */ |
| s->sr |= s->next_int; |
| |
| imx_gpt_compute_next_timeout(s, event); |
| |
| imx_gpt_update_int(s); |
| } else { |
| /* New timeout value */ |
| s->next_timeout = timeout; |
| |
| /* reset the limit to the computed range */ |
| ptimer_set_limit(s->timer, limit, 1); |
| } |
| } |
| |
| static uint64_t imx_gpt_read(void *opaque, hwaddr offset, unsigned size) |
| { |
| IMXGPTState *s = IMX_GPT(opaque); |
| uint32_t reg_value = 0; |
| uint32_t reg = offset >> 2; |
| |
| switch (reg) { |
| case 0: /* Control Register */ |
| reg_value = s->cr; |
| break; |
| |
| case 1: /* prescaler */ |
| reg_value = s->pr; |
| break; |
| |
| case 2: /* Status Register */ |
| reg_value = s->sr; |
| break; |
| |
| case 3: /* Interrupt Register */ |
| reg_value = s->ir; |
| break; |
| |
| case 4: /* Output Compare Register 1 */ |
| reg_value = s->ocr1; |
| break; |
| |
| case 5: /* Output Compare Register 2 */ |
| reg_value = s->ocr2; |
| break; |
| |
| case 6: /* Output Compare Register 3 */ |
| reg_value = s->ocr3; |
| break; |
| |
| case 7: /* input Capture Register 1 */ |
| qemu_log_mask(LOG_UNIMP, "icr1 feature is not implemented\n"); |
| reg_value = s->icr1; |
| break; |
| |
| case 8: /* input Capture Register 2 */ |
| qemu_log_mask(LOG_UNIMP, "icr2 feature is not implemented\n"); |
| reg_value = s->icr2; |
| break; |
| |
| case 9: /* cnt */ |
| imx_gpt_update_count(s); |
| reg_value = s->cnt; |
| break; |
| |
| default: |
| IPRINTF("Bad offset %x\n", reg); |
| break; |
| } |
| |
| DPRINTF("(%s) = 0x%08x\n", imx_gpt_reg_name(reg), reg_value); |
| |
| return reg_value; |
| } |
| |
| static void imx_gpt_reset(DeviceState *dev) |
| { |
| IMXGPTState *s = IMX_GPT(dev); |
| |
| /* stop timer */ |
| ptimer_stop(s->timer); |
| |
| /* |
| * Soft reset doesn't touch some bits; hard reset clears them |
| */ |
| s->cr &= ~(GPT_CR_EN|GPT_CR_ENMOD|GPT_CR_STOPEN|GPT_CR_DOZEN| |
| GPT_CR_WAITEN|GPT_CR_DBGEN); |
| s->sr = 0; |
| s->pr = 0; |
| s->ir = 0; |
| s->cnt = 0; |
| s->ocr1 = GPT_TIMER_MAX; |
| s->ocr2 = GPT_TIMER_MAX; |
| s->ocr3 = GPT_TIMER_MAX; |
| s->icr1 = 0; |
| s->icr2 = 0; |
| |
| s->next_timeout = GPT_TIMER_MAX; |
| s->next_int = 0; |
| |
| /* compute new freq */ |
| imx_gpt_set_freq(s); |
| |
| /* reset the limit to GPT_TIMER_MAX */ |
| ptimer_set_limit(s->timer, GPT_TIMER_MAX, 1); |
| |
| /* if the timer is still enabled, restart it */ |
| if (s->freq && (s->cr & GPT_CR_EN)) { |
| ptimer_run(s->timer, 1); |
| } |
| } |
| |
| static void imx_gpt_write(void *opaque, hwaddr offset, uint64_t value, |
| unsigned size) |
| { |
| IMXGPTState *s = IMX_GPT(opaque); |
| uint32_t oldreg; |
| uint32_t reg = offset >> 2; |
| |
| DPRINTF("(%s, value = 0x%08x)\n", imx_gpt_reg_name(reg), |
| (uint32_t)value); |
| |
| switch (reg) { |
| case 0: |
| oldreg = s->cr; |
| s->cr = value & ~0x7c14; |
| if (s->cr & GPT_CR_SWR) { /* force reset */ |
| /* handle the reset */ |
| imx_gpt_reset(DEVICE(s)); |
| } else { |
| /* set our freq, as the source might have changed */ |
| imx_gpt_set_freq(s); |
| |
| if ((oldreg ^ s->cr) & GPT_CR_EN) { |
| if (s->cr & GPT_CR_EN) { |
| if (s->cr & GPT_CR_ENMOD) { |
| s->next_timeout = GPT_TIMER_MAX; |
| ptimer_set_count(s->timer, GPT_TIMER_MAX); |
| imx_gpt_compute_next_timeout(s, false); |
| } |
| ptimer_run(s->timer, 1); |
| } else { |
| /* stop timer */ |
| ptimer_stop(s->timer); |
| } |
| } |
| } |
| break; |
| |
| case 1: /* Prescaler */ |
| s->pr = value & 0xfff; |
| imx_gpt_set_freq(s); |
| break; |
| |
| case 2: /* SR */ |
| s->sr &= ~(value & 0x3f); |
| imx_gpt_update_int(s); |
| break; |
| |
| case 3: /* IR -- interrupt register */ |
| s->ir = value & 0x3f; |
| imx_gpt_update_int(s); |
| |
| imx_gpt_compute_next_timeout(s, false); |
| |
| break; |
| |
| case 4: /* OCR1 -- output compare register */ |
| s->ocr1 = value; |
| |
| /* In non-freerun mode, reset count when this register is written */ |
| if (!(s->cr & GPT_CR_FRR)) { |
| s->next_timeout = GPT_TIMER_MAX; |
| ptimer_set_limit(s->timer, GPT_TIMER_MAX, 1); |
| } |
| |
| /* compute the new timeout */ |
| imx_gpt_compute_next_timeout(s, false); |
| |
| break; |
| |
| case 5: /* OCR2 -- output compare register */ |
| s->ocr2 = value; |
| |
| /* compute the new timeout */ |
| imx_gpt_compute_next_timeout(s, false); |
| |
| break; |
| |
| case 6: /* OCR3 -- output compare register */ |
| s->ocr3 = value; |
| |
| /* compute the new timeout */ |
| imx_gpt_compute_next_timeout(s, false); |
| |
| break; |
| |
| default: |
| IPRINTF("Bad offset %x\n", reg); |
| break; |
| } |
| } |
| |
| static void imx_gpt_timeout(void *opaque) |
| { |
| IMXGPTState *s = IMX_GPT(opaque); |
| |
| DPRINTF("\n"); |
| |
| s->sr |= s->next_int; |
| s->next_int = 0; |
| |
| imx_gpt_compute_next_timeout(s, true); |
| |
| imx_gpt_update_int(s); |
| |
| if (s->freq && (s->cr & GPT_CR_EN)) { |
| ptimer_run(s->timer, 1); |
| } |
| } |
| |
| static const MemoryRegionOps imx_gpt_ops = { |
| .read = imx_gpt_read, |
| .write = imx_gpt_write, |
| .endianness = DEVICE_NATIVE_ENDIAN, |
| }; |
| |
| |
| static void imx_gpt_realize(DeviceState *dev, Error **errp) |
| { |
| IMXGPTState *s = IMX_GPT(dev); |
| SysBusDevice *sbd = SYS_BUS_DEVICE(dev); |
| QEMUBH *bh; |
| |
| sysbus_init_irq(sbd, &s->irq); |
| memory_region_init_io(&s->iomem, OBJECT(s), &imx_gpt_ops, s, TYPE_IMX_GPT, |
| 0x00001000); |
| sysbus_init_mmio(sbd, &s->iomem); |
| |
| bh = qemu_bh_new(imx_gpt_timeout, s); |
| s->timer = ptimer_init(bh); |
| } |
| |
| void imx_timerg_create(const hwaddr addr, qemu_irq irq, DeviceState *ccm) |
| { |
| IMXGPTState *pp; |
| DeviceState *dev; |
| |
| dev = sysbus_create_simple(TYPE_IMX_GPT, addr, irq); |
| pp = IMX_GPT(dev); |
| pp->ccm = ccm; |
| } |
| |
| static void imx_gpt_class_init(ObjectClass *klass, void *data) |
| { |
| DeviceClass *dc = DEVICE_CLASS(klass); |
| |
| dc->realize = imx_gpt_realize; |
| dc->reset = imx_gpt_reset; |
| dc->vmsd = &vmstate_imx_timer_gpt; |
| dc->desc = "i.MX general timer"; |
| } |
| |
| static const TypeInfo imx_gpt_info = { |
| .name = TYPE_IMX_GPT, |
| .parent = TYPE_SYS_BUS_DEVICE, |
| .instance_size = sizeof(IMXGPTState), |
| .class_init = imx_gpt_class_init, |
| }; |
| |
| static void imx_gpt_register_types(void) |
| { |
| type_register_static(&imx_gpt_info); |
| } |
| |
| type_init(imx_gpt_register_types) |
