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Sun, 02 May 2021 13:12:21 -0700 (PDT) Received: from mrolnik-NUC10i7FNH.mynet ([2001:4df4:30e:9b00:8f7:3de1:39e4:6675]) by smtp.gmail.com with ESMTPSA id p22sm11032255edr.4.2021.05.02.13.12.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 02 May 2021 13:12:21 -0700 (PDT) From: Michael Rolnik To: qemu-devel@nongnu.org Subject: [RFC 1/1] Implement AVR watchdog timer Date: Sun, 2 May 2021 23:10:40 +0300 Message-Id: <20210502201040.52296-3-mrolnik@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210502201040.52296-1-mrolnik@gmail.com> References: <20210502201040.52296-1-mrolnik@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2a00:1450:4864:20::52f; envelope-from=mrolnik@gmail.com; helo=mail-ed1-x52f.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Michael Rolnik , me@xcancerberox.com.ar, konrad@adacore.com, richard.henderson@linaro.org, f4bug@amsat.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Signed-off-by: Michael Rolnik --- hw/avr/Kconfig | 1 + hw/avr/atmega.c | 15 ++- hw/avr/atmega.h | 2 + hw/watchdog/Kconfig | 3 + hw/watchdog/avr_wdt.c | 190 ++++++++++++++++++++++++++++++++++ hw/watchdog/meson.build | 2 + hw/watchdog/trace-events | 5 + include/hw/watchdog/avr_wdt.h | 47 +++++++++ target/avr/cpu.c | 3 + target/avr/cpu.h | 1 + target/avr/helper.c | 7 +- 11 files changed, 271 insertions(+), 5 deletions(-) create mode 100644 hw/watchdog/avr_wdt.c create mode 100644 include/hw/watchdog/avr_wdt.h diff --git a/hw/avr/Kconfig b/hw/avr/Kconfig index d31298c3cc..9939e4902f 100644 --- a/hw/avr/Kconfig +++ b/hw/avr/Kconfig @@ -3,6 +3,7 @@ config AVR_ATMEGA_MCU select AVR_TIMER16 select AVR_USART select AVR_POWER + select AVR_WDT config ARDUINO select AVR_ATMEGA_MCU diff --git a/hw/avr/atmega.c b/hw/avr/atmega.c index 44c6afebbb..31ceb1c21c 100644 --- a/hw/avr/atmega.c +++ b/hw/avr/atmega.c @@ -28,6 +28,7 @@ enum AtmegaPeripheral { GPIOG, GPIOH, GPIOI, GPIOJ, GPIOK, GPIOL, USART0, USART1, USART2, USART3, TIMER0, TIMER1, TIMER2, TIMER3, TIMER4, TIMER5, + WDT, PERIFMAX }; @@ -75,6 +76,7 @@ static const peripheral_cfg dev168_328[PERIFMAX] = { [GPIOD] = { 0x29 }, [GPIOC] = { 0x26 }, [GPIOB] = { 0x23 }, + [WDT] = { 0x60 }, }, dev1280_2560[PERIFMAX] = { [USART3] = { 0x130, POWER1, 2 }, [TIMER5] = { 0x120, POWER1, 5, 0x73, 0x3a, true }, @@ -99,6 +101,7 @@ static const peripheral_cfg dev168_328[PERIFMAX] = { [GPIOC] = { 0x26 }, [GPIOB] = { 0x23 }, [GPIOA] = { 0x20 }, + [WDT] = { 0x60 }, }; enum AtmegaIrq { @@ -118,6 +121,7 @@ enum AtmegaIrq { TIMER4_COMPC_IRQ, TIMER4_OVF_IRQ, TIMER5_CAPT_IRQ, TIMER5_COMPA_IRQ, TIMER5_COMPB_IRQ, TIMER5_COMPC_IRQ, TIMER5_OVF_IRQ, + WATCHDOG_TIMER_IRQ, IRQ_COUNT }; @@ -133,6 +137,7 @@ enum AtmegaIrq { #define TIMER_OVF_IRQ(n) (n * TIMER_IRQ_COUNT + TIMER0_OVF_IRQ) static const uint8_t irq168_328[IRQ_COUNT] = { + [WATCHDOG_TIMER_IRQ] = 7, [TIMER2_COMPA_IRQ] = 8, [TIMER2_COMPB_IRQ] = 9, [TIMER2_OVF_IRQ] = 10, @@ -147,6 +152,7 @@ static const uint8_t irq168_328[IRQ_COUNT] = { [USART0_DRE_IRQ] = 20, [USART0_TXC_IRQ] = 21, }, irq1280_2560[IRQ_COUNT] = { + [WATCHDOG_TIMER_IRQ] = 13, [TIMER2_COMPA_IRQ] = 14, [TIMER2_COMPB_IRQ] = 15, [TIMER2_OVF_IRQ] = 16, @@ -344,10 +350,17 @@ static void atmega_realize(DeviceState *dev, Error **errp) g_free(devname); } + /* Watchdog Timer */ + object_initialize_child(OBJECT(dev), "wdt", &s->wdt, TYPE_AVR_WDT); + sysbus_realize(SYS_BUS_DEVICE(&s->wdt), &error_abort); + sysbus_mmio_map(SYS_BUS_DEVICE(&s->wdt), 0, + OFFSET_DATA + mc->dev[WDT].addr); + qdev_connect_gpio_out_named(cpudev, "wdr", 0, + qdev_get_gpio_in_named(DEVICE(&s->wdt), "wdr", 0)); + create_unimplemented_device("avr-twi", OFFSET_DATA + 0x0b8, 6); create_unimplemented_device("avr-adc", OFFSET_DATA + 0x078, 8); create_unimplemented_device("avr-ext-mem-ctrl", OFFSET_DATA + 0x074, 2); - create_unimplemented_device("avr-watchdog", OFFSET_DATA + 0x060, 1); create_unimplemented_device("avr-spi", OFFSET_DATA + 0x04c, 3); create_unimplemented_device("avr-eeprom", OFFSET_DATA + 0x03f, 3); } diff --git a/hw/avr/atmega.h b/hw/avr/atmega.h index a99ee15c7e..60bbd44bdd 100644 --- a/hw/avr/atmega.h +++ b/hw/avr/atmega.h @@ -13,6 +13,7 @@ #include "hw/char/avr_usart.h" #include "hw/timer/avr_timer16.h" +#include "hw/watchdog/avr_wdt.h" #include "hw/misc/avr_power.h" #include "target/avr/cpu.h" #include "qom/object.h" @@ -45,6 +46,7 @@ struct AtmegaMcuState { AVRMaskState pwr[POWER_MAX]; AVRUsartState usart[USART_MAX]; AVRTimer16State timer[TIMER_MAX]; + AVRWatchdogState wdt; uint64_t xtal_freq_hz; }; diff --git a/hw/watchdog/Kconfig b/hw/watchdog/Kconfig index 66e1d029e3..e0f89d2fe0 100644 --- a/hw/watchdog/Kconfig +++ b/hw/watchdog/Kconfig @@ -20,3 +20,6 @@ config WDT_IMX2 config WDT_SBSA bool + +config AVR_WDT + bool diff --git a/hw/watchdog/avr_wdt.c b/hw/watchdog/avr_wdt.c new file mode 100644 index 0000000000..4ce1029a64 --- /dev/null +++ b/hw/watchdog/avr_wdt.c @@ -0,0 +1,190 @@ +/* + * AVR watchdog + * + * Copyright (c) 2018 Michael Rolnik + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see + * + */ + +#include "qemu/osdep.h" +#include "qapi/error.h" +#include "qemu/log.h" +#include "hw/irq.h" +#include "hw/watchdog/avr_wdt.h" +#include "trace.h" + +/* Field masks */ +#define WDTCSR_MASK_WDP0 0x01 +#define WDTCSR_MASK_WDP1 0x02 +#define WDTCSR_MASK_WDP2 0x04 +#define WDTCSR_MASK_WDE 0x08 +#define WDTCSR_MASK_WCE 0x10 +#define WDTCSR_MASK_WDP3 0x20 +#define WDTCSR_MASK_WDIE 0x40 +#define WDTCSR_MASK_WDIF 0x80 + +#define WDTCSR_SHFT_WDP0 0x00 +#define WDTCSR_SHFT_WDP1 0x01 +#define WDTCSR_SHFT_WDP2 0x02 +#define WDTCSR_SHFT_WDE 0x03 +#define WDTCSR_SHFT_WCE 0x04 +#define WDTCSR_SHFT_WDP3 0x05 +#define WDTCSR_SHFT_WDIE 0x06 +#define WDTCSR_SHFT_WDIF 0x07 + +/* Helper macros */ +#define WDP0(csr) ((csr & WDTCSR_MASK_WDP0) >> WDTCSR_SHFT_WDP0) +#define WDP1(csr) ((csr & WDTCSR_MASK_WDP1) >> WDTCSR_SHFT_WDP1) +#define WDP2(csr) ((csr & WDTCSR_MASK_WDP2) >> WDTCSR_SHFT_WDP2) +#define WDP3(csr) ((csr & WDTCSR_MASK_WDP3) >> WDTCSR_SHFT_WDP3) +#define WDP(csr) ((WDP3(csr) << 3) | (WDP2(csr) << 2) | \ + (WDP1(csr) << 1) | (WDP0(csr) << 0)) +#define WDIE(csr) ((csr & WDTCSR_MASK_WDIE) >> WDTCSR_SHFT_WDIE) +#define WDE(csr) ((csr & WDTCSR_MASK_WDE) >> WDTCSR_SHFT_WDE) +#define WCE(csr) ((csr & WDTCSR_MASK_WCE) >> WDTCSR_SHFT_WCE) + +#define DB_PRINT(fmt, args...) /* Nothing */ + +#define MS2NS(n) ((n) * 1000000ull) + +static void avr_wdt_reset_alarm(AVRWatchdogState *wdt) +{ + uint32_t csr = wdt->csr; + int wdp = WDP(csr); + assert(wdp <= 9); + + if (WDIE(csr) == 0 && WDE(csr) == 0) { + /* watchdog is stopped */ + return; + } + + timer_mod_ns(wdt->timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + + (MS2NS(15) << wdp)); +} + +static void avr_wdt_interrupt(void *opaque) +{ + AVRWatchdogState *wdt = opaque; + int8_t csr = wdt->csr; + + if (WDE(csr) == 0 && WDIE(csr) == 0) { + /* Stopped */ + + } else if (WDE(csr) == 0 && WDIE(csr) == 1) { + /* Interrupt Mode */ + wdt->csr |= WDTCSR_MASK_WDIF; + qemu_set_irq(wdt->irq, 1); + trace_avr_wdt_interrupt(); + } else if (WDE(csr) == 1 && WDIE(csr) == 0) { + /* System Reset Mode */ + } else if (WDE(csr) == 1 && WDIE(csr) == 1) { + /* Interrupt and System Reset Mode */ + wdt->csr |= WDTCSR_MASK_WDIF; + qemu_set_irq(wdt->irq, 1); + trace_avr_wdt_interrupt(); + } + + avr_wdt_reset_alarm(wdt); +} + +static void avr_wdt_reset(DeviceState *dev) +{ + AVRWatchdogState *wdt = AVR_WDT(dev); + + wdt->csr = 0; + qemu_set_irq(wdt->irq, 0); + avr_wdt_reset_alarm(wdt); +} + +static uint64_t avr_wdt_read(void *opaque, hwaddr offset, unsigned size) +{ + assert(size == 1); + AVRWatchdogState *wdt = opaque; + uint8_t retval = wdt->csr; + + trace_avr_wdt_read(offset, retval); + + return (uint64_t)retval; +} + +static void avr_wdt_write(void *opaque, hwaddr offset, + uint64_t val64, unsigned size) +{ + assert(size == 1); + AVRWatchdogState *wdt = opaque; + uint8_t val8 = (uint8_t)val64; + + trace_avr_wdt_write(offset, val8); + + wdt->csr = val8; + avr_wdt_reset_alarm(wdt); +} + +static const MemoryRegionOps avr_wdt_ops = { + .read = avr_wdt_read, + .write = avr_wdt_write, + .endianness = DEVICE_NATIVE_ENDIAN, + .impl = {.max_access_size = 1} +}; + +static void avr_wdt_wdr(void *opaque, int irq, int level) +{ + AVRWatchdogState *wdt = AVR_WDT(opaque); + + avr_wdt_reset_alarm(wdt); +} + +static void avr_wdt_init(Object *obj) +{ + AVRWatchdogState *s = AVR_WDT(obj); + + sysbus_init_irq(SYS_BUS_DEVICE(obj), &s->irq); + + memory_region_init_io(&s->iomem, obj, &avr_wdt_ops, + s, "avr-wdt", 0xa); + + sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->iomem); + qdev_init_gpio_in_named(DEVICE(s), avr_wdt_wdr, "wdr", 1); +} + +static void avr_wdt_realize(DeviceState *dev, Error **errp) +{ + AVRWatchdogState *s = AVR_WDT(dev); + + s->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, avr_wdt_interrupt, s); +} + +static void avr_wdt_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + + dc->reset = avr_wdt_reset; + dc->realize = avr_wdt_realize; +} + +static const TypeInfo avr_wdt_info = { + .name = TYPE_AVR_WDT, + .parent = TYPE_SYS_BUS_DEVICE, + .instance_size = sizeof(AVRWatchdogState), + .instance_init = avr_wdt_init, + .class_init = avr_wdt_class_init, +}; + +static void avr_wdt_register_types(void) +{ + type_register_static(&avr_wdt_info); +} + +type_init(avr_wdt_register_types) diff --git a/hw/watchdog/meson.build b/hw/watchdog/meson.build index 054c403dea..8db2be8317 100644 --- a/hw/watchdog/meson.build +++ b/hw/watchdog/meson.build @@ -6,3 +6,5 @@ softmmu_ss.add(when: 'CONFIG_WDT_DIAG288', if_true: files('wdt_diag288.c')) softmmu_ss.add(when: 'CONFIG_ASPEED_SOC', if_true: files('wdt_aspeed.c')) softmmu_ss.add(when: 'CONFIG_WDT_IMX2', if_true: files('wdt_imx2.c')) softmmu_ss.add(when: 'CONFIG_WDT_SBSA', if_true: files('sbsa_gwdt.c')) + +specific_ss.add(when: 'CONFIG_AVR_WDT', if_true: files('avr_wdt.c')) diff --git a/hw/watchdog/trace-events b/hw/watchdog/trace-events index 3124ca1f1b..ac14773179 100644 --- a/hw/watchdog/trace-events +++ b/hw/watchdog/trace-events @@ -5,3 +5,8 @@ cmsdk_apb_watchdog_read(uint64_t offset, uint64_t data, unsigned size) "CMSDK AP cmsdk_apb_watchdog_write(uint64_t offset, uint64_t data, unsigned size) "CMSDK APB watchdog write: offset 0x%" PRIx64 " data 0x%" PRIx64 " size %u" cmsdk_apb_watchdog_reset(void) "CMSDK APB watchdog: reset" cmsdk_apb_watchdog_lock(uint32_t lock) "CMSDK APB watchdog: lock %" PRIu32 + +# avr_wdt.c +avr_wdt_read(uint8_t addr, uint8_t value) "wdt read addr:%u value:%u" +avr_wdt_write(uint8_t addr, uint8_t value) "wdt write addr:%u value:%u" +avr_wdt_interrupt(void) "" diff --git a/include/hw/watchdog/avr_wdt.h b/include/hw/watchdog/avr_wdt.h new file mode 100644 index 0000000000..2679e8f2a6 --- /dev/null +++ b/include/hw/watchdog/avr_wdt.h @@ -0,0 +1,47 @@ +/* + * AVR 16-bit timer + * + * Copyright (c) 2021 Michael Rolnik + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see + * + */ + +#ifndef HW_WATCHDOG_AVR_WDT_H +#define HW_WATCHDOG_AVR_WDT_H + +#include "hw/sysbus.h" +#include "qemu/timer.h" +#include "hw/hw.h" +#include "qom/object.h" + +#define TYPE_AVR_WDT "avr-wdt" +OBJECT_DECLARE_SIMPLE_TYPE(AVRWatchdogState, AVR_WDT) + +struct AVRWatchdogState { + /* */ + SysBusDevice parent_obj; + + /* */ + MemoryRegion iomem; + MemoryRegion imsk_iomem; + MemoryRegion ifr_iomem; + QEMUTimer *timer; + qemu_irq irq; + + /* registers */ + uint8_t csr; +}; + +#endif /* HW_WATCHDOG_AVR_WDT_H */ diff --git a/target/avr/cpu.c b/target/avr/cpu.c index 0f4596932b..d5eb785833 100644 --- a/target/avr/cpu.c +++ b/target/avr/cpu.c @@ -131,6 +131,9 @@ static void avr_cpu_initfn(Object *obj) /* Set the number of interrupts supported by the CPU. */ qdev_init_gpio_in(DEVICE(cpu), avr_cpu_set_int, sizeof(cpu->env.intsrc) * 8); + + /* register watchdog timer reset interrupt */ + qdev_init_gpio_out_named(DEVICE(cpu), &cpu->wdr, "wdr", 1); } static ObjectClass *avr_cpu_class_by_name(const char *cpu_model) diff --git a/target/avr/cpu.h b/target/avr/cpu.h index d148e8c75a..f8f5641c8b 100644 --- a/target/avr/cpu.h +++ b/target/avr/cpu.h @@ -152,6 +152,7 @@ typedef struct AVRCPU { CPUNegativeOffsetState neg; CPUAVRState env; + qemu_irq wdr; /* reset WDT */ } AVRCPU; extern const struct VMStateDescription vms_avr_cpu; diff --git a/target/avr/helper.c b/target/avr/helper.c index 35e1019594..dd88057e5f 100644 --- a/target/avr/helper.c +++ b/target/avr/helper.c @@ -24,6 +24,7 @@ #include "exec/exec-all.h" #include "exec/address-spaces.h" #include "exec/helper-proto.h" +#include "hw/irq.h" bool avr_cpu_exec_interrupt(CPUState *cs, int interrupt_request) { @@ -188,11 +189,9 @@ void helper_break(CPUAVRState *env) void helper_wdr(CPUAVRState *env) { - CPUState *cs = env_cpu(env); + AVRCPU *cpu = env_archcpu(env); - /* WD is not implemented yet, placeholder */ - cs->exception_index = EXCP_DEBUG; - cpu_loop_exit(cs); + qemu_set_irq(cpu->wdr, 1); } /* -- 2.25.1