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X-Received-From: 2a00:1450:400c:c09::244 Subject: [Qemu-devel] [PATCH v2] bcm2835_armtimer: add bcm2835 ARM timer X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-arm@nongnu.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZohoMail: RDKM_2 RSF_0 Z_629925259 SPT_0 The ARM Timer is based on a ARM AP804, but it has a number of differences with the standard SP804. There is only one timer which runs in continuous mode with an extra clock pre-divider register and a 32-bit free running counter. The extra stop-in-debug-mode control bit is not implemented. Signed-off-by: Thomas Venri=C3=A8s --- hw/arm/bcm2835_peripherals.c | 18 +++ hw/timer/Makefile.objs | 1 + hw/timer/bcm2835_armtimer.c | 273 +++++++++++++++++++++++++++++++= ++++ hw/timer/trace-events | 4 + include/hw/arm/bcm2835_peripherals.h | 2 + include/hw/timer/bcm2835_armtimer.h | 35 +++++ 6 files changed, 333 insertions(+) create mode 100644 hw/timer/bcm2835_armtimer.c create mode 100644 include/hw/timer/bcm2835_armtimer.h diff --git a/hw/arm/bcm2835_peripherals.c b/hw/arm/bcm2835_peripherals.c index 12e0dd1..73deb2e 100644 --- a/hw/arm/bcm2835_peripherals.c +++ b/hw/arm/bcm2835_peripherals.c @@ -90,6 +90,11 @@ static void bcm2835_peripherals_init(Object *obj) object_property_add_child(obj, "rng", OBJECT(&s->rng), NULL); qdev_set_parent_bus(DEVICE(&s->rng), sysbus_get_default()); + /* ARM Timer */ + object_initialize(&s->armtimer, sizeof(s->armtimer), TYPE_BCM2835_ARMT= IMER); + object_property_add_child(obj, "armtimer", OBJECT(&s->armtimer), NULL); + qdev_set_parent_bus(DEVICE(&s->armtimer), sysbus_get_default()); + /* Extended Mass Media Controller */ object_initialize(&s->sdhci, sizeof(s->sdhci), TYPE_SYSBUS_SDHCI); object_property_add_child(obj, "sdhci", OBJECT(&s->sdhci), NULL); @@ -254,6 +259,19 @@ static void bcm2835_peripherals_realize(DeviceState *d= ev, Error **errp) memory_region_add_subregion(&s->peri_mr, RNG_OFFSET, sysbus_mmio_get_region(SYS_BUS_DEVICE(&s->rng), 0)); + /* ARM Timer */ + object_property_set_bool(OBJECT(&s->armtimer), true, "realized", &err); + if (err) { + error_propagate(errp, err); + return; + } + + memory_region_add_subregion(&s->peri_mr, ARMCTRL_TIMER0_1_OFFSET, + sysbus_mmio_get_region(SYS_BUS_DEVICE(&s->armtimer), 0)); + sysbus_connect_irq(SYS_BUS_DEVICE(&s->armtimer), 0, + qdev_get_gpio_in_named(DEVICE(&s->ic), BCM2835_IC_ARM_IRQ, + INTERRUPT_ARM_TIMER)); + /* Extended Mass Media Controller */ object_property_set_int(OBJECT(&s->sdhci), BCM2835_SDHC_CAPAREG, "capa= reg", &err); diff --git a/hw/timer/Makefile.objs b/hw/timer/Makefile.objs index 8c19eac..268d485 100644 --- a/hw/timer/Makefile.objs +++ b/hw/timer/Makefile.objs @@ -29,6 +29,7 @@ obj-$(CONFIG_EXYNOS4) +=3D exynos4210_rtc.o obj-$(CONFIG_OMAP) +=3D omap_gptimer.o obj-$(CONFIG_OMAP) +=3D omap_synctimer.o obj-$(CONFIG_PXA2XX) +=3D pxa2xx_timer.o +obj-$(CONFIG_RASPI) +=3D bcm2835_armtimer.o obj-$(CONFIG_SH4) +=3D sh_timer.o obj-$(CONFIG_DIGIC) +=3D digic-timer.o obj-$(CONFIG_MIPS_CPS) +=3D mips_gictimer.o diff --git a/hw/timer/bcm2835_armtimer.c b/hw/timer/bcm2835_armtimer.c new file mode 100644 index 0000000..39ff213 --- /dev/null +++ b/hw/timer/bcm2835_armtimer.c @@ -0,0 +1,273 @@ +/* + * BCM2835 ARM Timer + * + * Copyright (C) 2017 Thomas Venri=C3=A8s + * + * This work is licensed under the terms of the GNU GPL, version 2 or late= r. + * See the COPYING file in the top-level directory. + */ + +#include "qemu/osdep.h" +#include "qemu/log.h" +#include "qapi/error.h" +#include "qemu/timer.h" +#include "qemu/main-loop.h" +#include "hw/ptimer.h" +#include "hw/timer/bcm2835_armtimer.h" +#include "trace.h" + +#define ARM_TIMER_REG_SIZE 0x24 + +/* Register offsets */ +#define ARM_TIMER_LOAD 0x00 +#define ARM_TIMER_VALUE 0x04 +#define ARM_TIMER_CTRL 0x08 +#define ARM_TIMER_INTCLR 0x0C +#define ARM_TIMER_RAW_IRQ 0x10 +#define ARM_TIMER_MASK_IRQ 0x14 +#define ARM_TIMER_RELOAD 0x18 +#define ARM_TIMER_PREDIVIDER 0x1C +#define ARM_TIMER_COUNTER 0x20 + +/* Control register masks */ +#define CTRL_CNT_PRESCALE (0xFF << 16) +#define CTRL_CNT_ENABLE (1 << 9) +#define CTRL_TIMER_ENABLE (1 << 7) +#define CTRL_INT_ENABLE (1 << 5) +#define CTRL_TIMER_PRESCALE (3 << 2) +#define CTRL_TIMER_SIZE_32BIT (1 << 1) + +#define CTRL_TIMER_WRAP_MODE 0 + +/* Register reset values */ +#define CTRL_CNT_PRESCALE_RESET (0x3E << 16) +#define ARM_TIMER_CTRL_RESET (CTRL_CNT_PRESCALE_RESET | CTRL_INT_EN= ABLE) +#define ARM_TIMER_IE_READ_VALUE 0x544D5241 /* ASCII "ARMT" */ +/* + The system clock refers to a 250 MHz frequency by default. + This frequency can be changed by setting `core_freq` the `config.txt` f= ile. + APB clock runs at half the speed of the system clock also called ARM cl= ock. + + The ARM timer's predivider register is 10 bits wide and can be written + or read from. This register has been added as the SP804 expects a 1MHz = clock + which they do not have. Instead the predivider takes the APB clock + and divides it down according to: + + timer_clock =3D apb_clock / (prediv + 1) + + The need is a 1MHz timer clock frequency and BCM2835 ARM Peripherals + documentation mentions the predivider reset value is 0x7D (or 125), so + the APB clock refers to a 126MHz frequency. + + Also the additional free-running counter runs from the APB clock and has + its own clock predivider controlled by buts 16-23 of the timer control = reg: + + frc_clock =3D apb_clock / (prediv + 1) + + The predivider reset value is 0x3E (or 62), knowing APB clock frequency, + the FRN clock refers to a 2MHz frequency by default. +*/ +#define ARM_APB_FREQ 126000000UL /* Hz */ +#define ARM_TIMER_PREDIVIDER_RESET 125 /* MHz */ + +static const uint16_t ctrl_prescale[] =3D { 1, 16, 256, 1 }; + +static void bcm2835_armtimer_recalibrate(BCM2835ARMTimerState *s, int relo= ad) +{ + uint32_t limit; + + /* ARM Dual-Timer Module SP804, section 3.2.1: + If the Load Register is set to 0 then an interrupt is generated + immediately. */ + if (reload =3D=3D 2) { + limit =3D s->reload; + } else { + limit =3D (s->ctrl & CTRL_TIMER_SIZE_32BIT) ? 0xFFFFFFFF : 0XFFFF; + } + + ptimer_set_limit(s->timer, limit, reload); +} + +static void bcm2835_armtimer_cb(void *opaque) +{ + BCM2835ARMTimerState *s =3D (BCM2835ARMTimerState *)opaque; + + s->raw_irq =3D 1; + + if (s->ctrl & CTRL_TIMER_ENABLE) { + qemu_irq_raise(s->irq); + trace_bcm2835_armtimer_interrupt(); + } +} + +static uint64_t bcm2835_armtimer_read(void *opaque, hwaddr offset, + unsigned size) +{ + BCM2835ARMTimerState *s =3D (BCM2835ARMTimerState *)opaque; + + switch (offset) { + case ARM_TIMER_LOAD: + case ARM_TIMER_RELOAD: + return s->reload; + case ARM_TIMER_VALUE: + return ptimer_get_count(s->timer); + case ARM_TIMER_CTRL: + return s->ctrl; + case ARM_TIMER_INTCLR: + return ARM_TIMER_IE_READ_VALUE; + case ARM_TIMER_RAW_IRQ: + return s->raw_irq; + case ARM_TIMER_MASK_IRQ: + return s->raw_irq && (s->ctrl & CTRL_INT_ENABLE); + case ARM_TIMER_PREDIVIDER: + return s->prediv; + case ARM_TIMER_COUNTER: + return qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) / s->prescaler; + + default: + qemu_log_mask(LOG_GUEST_ERROR, + "bcm2835_armtimer_read: Bad offset - [%x]\n", + (int)offset); + return 0; + } +} + +static void bcm2835_armtimer_write(void *opaque, hwaddr offset, + uint64_t value, unsigned size) +{ + BCM2835ARMTimerState *s =3D (BCM2835ARMTimerState *)opaque; + uint32_t div; + + switch (offset) { + case ARM_TIMER_LOAD: + bcm2835_armtimer_recalibrate(s, 2); + break; + case ARM_TIMER_CTRL: + if (s->ctrl & CTRL_TIMER_ENABLE) { + ptimer_stop(s->timer); + } + + s->ctrl =3D value; + + s->prescaler =3D (ARM_APB_FREQ / + (((s->ctrl & CTRL_CNT_PRESCALE) >> 16) + 1)); + + bcm2835_armtimer_recalibrate(s, s->ctrl & CTRL_TIMER_ENABLE); + + div =3D ctrl_prescale[((s->ctrl & CTRL_TIMER_PRESCALE) >> 2)] + * s->prediv; + ptimer_set_freq(s->timer, ARM_APB_FREQ / div); + + if (s->ctrl & CTRL_TIMER_ENABLE) { + ptimer_run(s->timer, CTRL_TIMER_WRAP_MODE); + } + break; + case ARM_TIMER_INTCLR: + qemu_irq_lower(s->irq); + s->raw_irq =3D 0; + trace_bcm2835_armtimer_ack(); + break; + case ARM_TIMER_RELOAD: + /* In Free-running mode the timer counter wraps around to 32 or 16= -bit + limit (respectively 0xFFFFFFFF or 0xFFFFF) regardless the Reload + and Load Register values, except that when the Load Register is + written to directly, the current count immediately resets to th= e 32 + or 16-bits limit according to the Control Register bit [1]. */ + s->reload =3D value; + break; + case ARM_TIMER_PREDIVIDER: + s->prediv =3D value + 1; + if (s->ctrl & CTRL_TIMER_ENABLE) { + ptimer_stop(s->timer); + div =3D ctrl_prescale[((s->ctrl & CTRL_TIMER_PRESCALE) >> 2)] + * s->prediv; + ptimer_set_freq(s->timer, ARM_APB_FREQ / div); + ptimer_run(s->timer, CTRL_TIMER_WRAP_MODE); + } + break; + + case ARM_TIMER_VALUE: + case ARM_TIMER_RAW_IRQ: + case ARM_TIMER_MASK_IRQ: + case ARM_TIMER_COUNTER: + default: + qemu_log_mask(LOG_GUEST_ERROR, + "bcm2835_armtimer_write: Bad offset - [%x]\n", + (int)offset); + } +} + +static const MemoryRegionOps bcm2835_armtimer_ops =3D { + .read =3D bcm2835_armtimer_read, + .write =3D bcm2835_armtimer_write, + .endianness =3D DEVICE_NATIVE_ENDIAN, + .valid.min_access_size =3D 4, + .valid.max_access_size =3D 4, +}; + +static const VMStateDescription vmstate_bcm2835_armtimer =3D { + .name =3D TYPE_BCM2835_ARMTIMER, + .version_id =3D 1, + .minimum_version_id =3D 1, + .fields =3D (VMStateField[]) { + VMSTATE_UINT32(ctrl, BCM2835ARMTimerState), + VMSTATE_UINT32(reload, BCM2835ARMTimerState), + VMSTATE_UINT32(raw_irq, BCM2835ARMTimerState), + VMSTATE_UINT32(msk_irq, BCM2835ARMTimerState), + VMSTATE_UINT32(prediv, BCM2835ARMTimerState), + VMSTATE_END_OF_LIST() + } +}; + +static void bcm2835_armtimer_init(Object *obj) +{ + BCM2835ARMTimerState *s =3D BCM2835_ARMTIMER(obj); + QEMUBH *bh =3D qemu_bh_new(bcm2835_armtimer_cb, s); + + s->reload =3D s->raw_irq =3D s->msk_irq =3D 0; + s->prediv =3D ARM_TIMER_PREDIVIDER_RESET; + + /* ARM Dual-Timer Module SP804, section 2.2.6: + Timer Control Register Initialization : + - the timer counter is disabled, Bit[7]=3D0 + - 16-bit counter mode is selected, Bit[1]=3D0 + - prescalers are set to divide by 1, Bit[2:3]=3D0x0 + - interrupts are cleared but enabled, Bit[5]=3D1 + - the Load Register is set to zero + - the counter Value is set to 0xFFFFFFFF (useless) + BCM2835 ARM Peripherals, section 14.2: + - free-running mode is always selected, Bit[6]=3D0 and Bit[0]= =3D0 + because periodic and one-shot modes are not supported. */ + s->ctrl =3D ARM_TIMER_CTRL_RESET; + + s->timer =3D ptimer_init(bh, PTIMER_POLICY_DEFAULT); + + memory_region_init_io(&s->iomem, obj, &bcm2835_armtimer_ops, s, + TYPE_BCM2835_ARMTIMER, ARM_TIMER_REG_SIZE); + + sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->iomem); + sysbus_init_irq(SYS_BUS_DEVICE(obj), &s->irq); +} + +static void bcm2835_armtimer_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc =3D DEVICE_CLASS(klass); + + dc->desc =3D "BCM2835 ARM Timer"; + dc->vmsd =3D &vmstate_bcm2835_armtimer; +} + +static TypeInfo bcm2835_armtimer_info =3D { + .name =3D TYPE_BCM2835_ARMTIMER, + .parent =3D TYPE_SYS_BUS_DEVICE, + .instance_size =3D sizeof(BCM2835ARMTimerState), + .class_init =3D bcm2835_armtimer_class_init, + .instance_init =3D bcm2835_armtimer_init, +}; + +static void bcm2835_armtimer_register_types(void) +{ + type_register_static(&bcm2835_armtimer_info); +} + +type_init(bcm2835_armtimer_register_types) diff --git a/hw/timer/trace-events b/hw/timer/trace-events index 640722b..d81dd38 100644 --- a/hw/timer/trace-events +++ b/hw/timer/trace-events @@ -60,3 +60,7 @@ systick_write(uint64_t addr, uint32_t value, unsigned siz= e) "systick write addr cmsdk_apb_timer_read(uint64_t offset, uint64_t data, unsigned size) "CMSDK= APB timer read: offset 0x%" PRIx64 " data 0x%" PRIx64 " size %u" cmsdk_apb_timer_write(uint64_t offset, uint64_t data, unsigned size) "CMSD= K APB timer write: offset 0x%" PRIx64 " data 0x%" PRIx64 " size %u" cmsdk_apb_timer_reset(void) "CMSDK APB timer: reset" + +# hw/timer/bcm2535_armtimer.c +bcm2835_armtimer_interrupt(void) "irq" +bcm2835_armtimer_ack(void) "ack" diff --git a/include/hw/arm/bcm2835_peripherals.h b/include/hw/arm/bcm2835_= peripherals.h index 122b286..236433b 100644 --- a/include/hw/arm/bcm2835_peripherals.h +++ b/include/hw/arm/bcm2835_peripherals.h @@ -20,6 +20,7 @@ #include "hw/intc/bcm2835_ic.h" #include "hw/misc/bcm2835_property.h" #include "hw/misc/bcm2835_rng.h" +#include "hw/timer/bcm2835_armtimer.h" #include "hw/misc/bcm2835_mbox.h" #include "hw/sd/sdhci.h" #include "hw/sd/bcm2835_sdhost.h" @@ -43,6 +44,7 @@ typedef struct BCM2835PeripheralState { BCM2835FBState fb; BCM2835DMAState dma; BCM2835ICState ic; + BCM2835ARMTimerState armtimer; BCM2835PropertyState property; BCM2835RngState rng; BCM2835MboxState mboxes; diff --git a/include/hw/timer/bcm2835_armtimer.h b/include/hw/timer/bcm2835= _armtimer.h new file mode 100644 index 0000000..cb69f75 --- /dev/null +++ b/include/hw/timer/bcm2835_armtimer.h @@ -0,0 +1,35 @@ +/* + * BCM2835 ARM Timer + * + * Copyright (C) 2017 Thomas Venri=C3=A8s + * + * This work is licensed under the terms of the GNU GPL, version 2 or late= r. + * See the COPYING file in the top-level directory. + */ + +#ifndef BCM2835_ARMTIMER_H +#define BCM2835_ARMTIMER_H + +#include "hw/ptimer.h" +#include "hw/sysbus.h" + +#define TYPE_BCM2835_ARMTIMER "bcm2835-armtimer" +#define BCM2835_ARMTIMER(obj) \ + OBJECT_CHECK(BCM2835ARMTimerState, (obj), TYPE_BCM2835_ARMTIMER) + +typedef struct { + SysBusDevice parent_obj; + MemoryRegion iomem; + + ptimer_state *timer; + qemu_irq irq; + + uint32_t ctrl; + uint32_t raw_irq; + uint32_t msk_irq; + uint32_t reload; + uint32_t prediv; + uint32_t prescaler; +} BCM2835ARMTimerState; + +#endif -- 2.7.4