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[174.91.97.36]) by smtp.googlemail.com with ESMTPSA id s73sm1338373qke.71.2020.10.15.09.35.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 15 Oct 2020 09:35:01 -0700 (PDT) From: Shashi Mallela To: peter.maydell@linaro.org, leif@nuviainc.com, rad@semihalf.com Subject: [PATCH v6 1/2] hw/watchdog: Implement SBSA watchdog device Date: Thu, 15 Oct 2020 12:34:58 -0400 Message-Id: <20201015163459.32298-2-shashi.mallela@linaro.org> X-Mailer: git-send-email 2.18.4 In-Reply-To: <20201015163459.32298-1-shashi.mallela@linaro.org> References: <20201015163459.32298-1-shashi.mallela@linaro.org> Received-SPF: pass client-ip=2607:f8b0:4864:20::843; envelope-from=shashi.mallela@linaro.org; helo=mail-qt1-x843.google.com X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. That's all we know. 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, 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: qemu-arm@nongnu.org, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Generic watchdog device model has been implemented as per ARM BSAv0.9 Signed-off-by: Shashi Mallela --- hw/arm/Kconfig | 1 + hw/watchdog/Kconfig | 4 + hw/watchdog/meson.build | 1 + hw/watchdog/wdt_sbsa_gwdt.c | 346 ++++++++++++++++++++++++++++ include/hw/watchdog/wdt_sbsa_gwdt.h | 70 ++++++ 5 files changed, 422 insertions(+) create mode 100644 hw/watchdog/wdt_sbsa_gwdt.c create mode 100644 include/hw/watchdog/wdt_sbsa_gwdt.h diff --git a/hw/arm/Kconfig b/hw/arm/Kconfig index f303c6bead25..6b97e64595d3 100644 --- a/hw/arm/Kconfig +++ b/hw/arm/Kconfig @@ -210,6 +210,7 @@ config SBSA_REF select PL031 # RTC select PL061 # GPIO select USB_EHCI_SYSBUS + select WDT_SBSA_GWDT config SABRELITE bool diff --git a/hw/watchdog/Kconfig b/hw/watchdog/Kconfig index 293209b291d6..ea9cadd66f22 100644 --- a/hw/watchdog/Kconfig +++ b/hw/watchdog/Kconfig @@ -17,3 +17,7 @@ config WDT_DIAG288 config WDT_IMX2 bool + +config WDT_SBSA_GWDT + bool + default y if SBSA_REF diff --git a/hw/watchdog/meson.build b/hw/watchdog/meson.build index 9b8725e64288..a9a23307acfe 100644 --- a/hw/watchdog/meson.build +++ b/hw/watchdog/meson.build @@ -5,3 +5,4 @@ softmmu_ss.add(when: 'CONFIG_WDT_IB700', if_true: files('wdt_ib700.c')) 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_GWDT', if_true: files('wdt_sbsa_gwdt.c')) diff --git a/hw/watchdog/wdt_sbsa_gwdt.c b/hw/watchdog/wdt_sbsa_gwdt.c new file mode 100644 index 000000000000..1c2fe04db7c7 --- /dev/null +++ b/hw/watchdog/wdt_sbsa_gwdt.c @@ -0,0 +1,346 @@ +/* + * Generic watchdog device model for SBSA + * + * Copyright Linaro.org 2020 + * + * Authors: + * Shashi Mallela + * + * This work is licensed under the terms of the GNU GPL, version 2 or (at your + * option) any later version. See the COPYING file in the top-level directory. + * + */ + +#include "qemu/osdep.h" +#include "sysemu/reset.h" +#include "sysemu/watchdog.h" +#include "hw/watchdog/wdt_sbsa_gwdt.h" +#include "qemu/timer.h" +#include "migration/vmstate.h" +#include "qemu/log.h" +#include "qemu/module.h" + +static WatchdogTimerModel model = { + .wdt_name = TYPE_WDT_SBSA_GWDT, + .wdt_description = "sbsa_gwdt device for sbsa_ref platform", +}; + +static const VMStateDescription vmstate_sbsa_gwdt = { + .name = "vmstate_sbsa_gwdt", + .version_id = 1, + .minimum_version_id = 1, + .fields = (VMStateField[]) { + VMSTATE_TIMER_PTR(timer, SBSA_GWDTState), + VMSTATE_BOOL(enabled, SBSA_GWDTState), + VMSTATE_BOOL(ws0, SBSA_GWDTState), + VMSTATE_BOOL(ws1, SBSA_GWDTState), + VMSTATE_UINT32(wrr, SBSA_GWDTState), + VMSTATE_UINT32(wcs, SBSA_GWDTState), + VMSTATE_UINT32(worl, SBSA_GWDTState), + VMSTATE_UINT32(woru, SBSA_GWDTState), + VMSTATE_UINT32(wcvl, SBSA_GWDTState), + VMSTATE_UINT32(wcvu, SBSA_GWDTState), + VMSTATE_END_OF_LIST() + } +}; + +static uint64_t sbsa_gwdt_rread(void *opaque, hwaddr addr, unsigned int size) +{ + uint32_t ret = 0; + + if (addr == SBSA_GWDT_WRR) { + /* watch refresh read has no effect and returns 0 */ + ret = 0; + } else { + qemu_log_mask(LOG_GUEST_ERROR, "bad address in refresh frame read :" + " 0x%x\n", (int)addr); + } + return ret; +} + +static uint64_t sbsa_gwdt_read(void *opaque, hwaddr addr, unsigned int size) +{ + SBSA_GWDTState *s = SBSA_GWDT(opaque); + uint32_t ret = 0; + + switch (addr) { + case SBSA_GWDT_WCS: + ret = s->wcs; + break; + case SBSA_GWDT_WOR: + ret = s->worl; + break; + case SBSA_GWDT_WORU: + ret = s->woru; + break; + case SBSA_GWDT_WCV: + ret = s->wcvl; + break; + case SBSA_GWDT_WCVU: + ret = s->wcvu; + break; + case SBSA_GWDT_W_IIDR: + ret = s->id; + break; + default: + qemu_log_mask(LOG_GUEST_ERROR, "bad address in control frame read :" + " 0x%x\n", (int)addr); + } + return ret; +} + +static void sbsa_gwdt_update_timer(SBSA_GWDTState *s) +{ + uint64_t timeout = 0; + + if (s->enabled) { + /* + * Extract the upper 16 bits from woru & 32 bits from worl + * registers to construct the 48 bit offset value + */ + timeout = s->woru & SBSA_GWDT_WOR_MASK; + timeout <<= 32; + timeout |= s->worl; + timeout = muldiv64(timeout, NANOSECONDS_PER_SECOND, SBSA_TIMER_FREQ); + timeout += qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); + + /* store the current timeout value into compare registers */ + s->wcvu = timeout >> 32; + s->wcvl = timeout; + + if (!s->ws0) { + timer_del(s->timer); + timer_mod(s->ptimer, timeout); + } else { + timer_del(s->ptimer); + timer_mod(s->timer, timeout); + } + } else { + timer_del(s->ptimer); + timer_del(s->timer); + } +} + +static void sbsa_gwdt_rwrite(void *opaque, hwaddr offset, uint64_t data, + unsigned size) { + SBSA_GWDTState *s = SBSA_GWDT(opaque); + + if (offset == SBSA_GWDT_WRR) { + s->wrr = data; + s->wcs &= ~SBSA_GWDT_WCS_WS0; + s->wcs &= ~SBSA_GWDT_WCS_WS1; + s->ws0 = false; + s->ws1 = false; + sbsa_gwdt_update_timer(s); + } else { + qemu_log_mask(LOG_GUEST_ERROR, "bad address in refresh frame write :" + " 0x%x\n", (int)offset); + } +} + +static void sbsa_gwdt_write(void *opaque, hwaddr offset, uint64_t data, + unsigned size) { + SBSA_GWDTState *s = SBSA_GWDT(opaque); + bool enable; + + switch (offset) { + case SBSA_GWDT_WCS: + enable = data & SBSA_GWDT_WCS_EN; + if (enable) { + s->wcs |= SBSA_GWDT_WCS_EN; + s->enabled = true; + } else { + s->wcs &= ~SBSA_GWDT_WCS_EN; + s->enabled = false; + } + s->ws0 = false; + s->ws1 = false; + s->wcs &= ~SBSA_GWDT_WCS_WS0; + s->wcs &= ~SBSA_GWDT_WCS_WS1; + sbsa_gwdt_update_timer(s); + break; + + case SBSA_GWDT_WOR: + s->worl = data; + s->ws0 = false; + s->ws1 = false; + s->wcs &= ~SBSA_GWDT_WCS_WS0; + s->wcs &= ~SBSA_GWDT_WCS_WS1; + /* + * TODO:- setting woru to 0 and triggering update timer(below) is a + * temporary workaround to handle current linux driver which is + * based on earlier version of BSA specification.Once the linux + * driver is updated to BSA v0.9 will remove these next 2 lines. + */ + s->woru = 0; + sbsa_gwdt_update_timer(s); + break; + + case SBSA_GWDT_WORU: + s->woru = data; + s->ws0 = false; + s->ws1 = false; + s->wcs &= ~SBSA_GWDT_WCS_WS0; + s->wcs &= ~SBSA_GWDT_WCS_WS1; + sbsa_gwdt_update_timer(s); + break; + + case SBSA_GWDT_WCV: + s->wcvl = data; + break; + + case SBSA_GWDT_WCVU: + s->wcvu = data; + break; + + default: + qemu_log_mask(LOG_GUEST_ERROR, "bad address in control frame write :" + " 0x%x\n", (int)offset); + } + return; +} + +static void wdt_sbsa_gwdt_reset(DeviceState *dev) +{ + SBSA_GWDTState *s = SBSA_GWDT(dev); + + timer_del(s->ptimer); + timer_del(s->timer); + + s->enabled = false; + s->ws0 = false; + s->ws1 = false; + s->wcs &= ~SBSA_GWDT_WCS_EN; + s->wcs &= ~SBSA_GWDT_WCS_WS0; + s->wcs &= ~SBSA_GWDT_WCS_WS1; + s->wcvl = 0; + s->wcvu = 0; + s->worl = 0; + s->woru = 0; + s->id = SBSA_GWDT_ID; +} + +static void sbsa_gwdt_reset(void *opaque) +{ + DeviceState *sbsa_gwdt = opaque; + + wdt_sbsa_gwdt_reset(sbsa_gwdt); +} + +static void sbsa_gwdt_timer_sysinterrupt(void *opaque) +{ + SBSA_GWDTState *s = SBSA_GWDT(opaque); + + s->wcs |= SBSA_GWDT_WCS_WS0; + s->ws0 = true; + qemu_set_irq(s->irq, 1); + sbsa_gwdt_update_timer(s); +} + +static void sbsa_gwdt_timer_sysreset(void *dev) +{ + SBSA_GWDTState *s = SBSA_GWDT(dev); + + s->wcs |= SBSA_GWDT_WCS_WS1; + s->ws1 = true; + qemu_log_mask(CPU_LOG_RESET, "Watchdog timer expired.\n"); + /* + * Reset the watchdog only if the guest gets notified about + * expiry. watchdog_perform_action() may temporarily relinquish + * the BQL; reset before triggering the action to avoid races with + * sbsa_gwdt instructions. + */ + switch (get_watchdog_action()) { + case WATCHDOG_ACTION_DEBUG: + case WATCHDOG_ACTION_NONE: + case WATCHDOG_ACTION_PAUSE: + break; + default: + wdt_sbsa_gwdt_reset(dev); + } + watchdog_perform_action(); +} + +static const MemoryRegionOps sbsa_gwdt_rops = { + .read = sbsa_gwdt_rread, + .write = sbsa_gwdt_rwrite, + .endianness = DEVICE_LITTLE_ENDIAN, + .valid.min_access_size = 4, + .valid.max_access_size = 4, + .valid.unaligned = false, +}; + +static const MemoryRegionOps sbsa_gwdt_ops = { + .read = sbsa_gwdt_read, + .write = sbsa_gwdt_write, + .endianness = DEVICE_LITTLE_ENDIAN, + .valid.min_access_size = 4, + .valid.max_access_size = 4, + .valid.unaligned = false, +}; + +static void wdt_sbsa_gwdt_realize(DeviceState *dev, Error **errp) +{ + SBSA_GWDTState *s = SBSA_GWDT(dev); + SysBusDevice *sbd = SYS_BUS_DEVICE(dev); + + memory_region_init_io(&s->rmmio, OBJECT(dev), + &sbsa_gwdt_rops, s, + "sbsa_gwdt.refresh", + SBSA_GWDT_RMMIO_SIZE); + + memory_region_init_io(&s->cmmio, OBJECT(dev), + &sbsa_gwdt_ops, s, + "sbsa_gwdt.control", + SBSA_GWDT_CMMIO_SIZE); + + sysbus_init_mmio(sbd, &s->rmmio); + sysbus_init_mmio(sbd, &s->cmmio); + + sysbus_init_irq(sbd, &s->irq); + + qemu_register_reset(sbsa_gwdt_reset, s); + + s->ptimer = timer_new_ns(QEMU_CLOCK_VIRTUAL, sbsa_gwdt_timer_sysinterrupt, + dev); + s->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, sbsa_gwdt_timer_sysreset, + dev); +} + +static void wdt_sbsa_gwdt_unrealize(DeviceState *dev) +{ + SBSA_GWDTState *s = SBSA_GWDT(dev); + + timer_del(s->ptimer); + timer_free(s->ptimer); + + timer_del(s->timer); + timer_free(s->timer); +} + +static void wdt_sbsa_gwdt_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + + dc->realize = wdt_sbsa_gwdt_realize; + dc->unrealize = wdt_sbsa_gwdt_unrealize; + dc->reset = wdt_sbsa_gwdt_reset; + dc->hotpluggable = false; + set_bit(DEVICE_CATEGORY_MISC, dc->categories); + dc->vmsd = &vmstate_sbsa_gwdt; +} + +static const TypeInfo wdt_sbsa_gwdt_info = { + .class_init = wdt_sbsa_gwdt_class_init, + .parent = TYPE_SYS_BUS_DEVICE, + .name = TYPE_WDT_SBSA_GWDT, + .instance_size = sizeof(SBSA_GWDTState), +}; + +static void wdt_sbsa_gwdt_register_types(void) +{ + watchdog_add_model(&model); + type_register_static(&wdt_sbsa_gwdt_info); +} + +type_init(wdt_sbsa_gwdt_register_types) diff --git a/include/hw/watchdog/wdt_sbsa_gwdt.h b/include/hw/watchdog/wdt_sbsa_gwdt.h new file mode 100644 index 000000000000..70ba7abb3ace --- /dev/null +++ b/include/hw/watchdog/wdt_sbsa_gwdt.h @@ -0,0 +1,70 @@ +#ifndef WDT_SBSA_GWDT_H +#define WDT_SBSA_GWDT_H + +#include "qemu/bitops.h" +#include "hw/sysbus.h" +#include "hw/irq.h" + +#define TYPE_WDT_SBSA_GWDT "sbsa_gwdt" +#define SBSA_GWDT(obj) \ + OBJECT_CHECK(SBSA_GWDTState, (obj), TYPE_WDT_SBSA_GWDT) +#define SBSA_GWDT_CLASS(klass) \ + OBJECT_CLASS_CHECK(SBSA_GWDTClass, (klass), TYPE_WDT_SBSA_GWDT) +#define SBSA_GWDT_GET_CLASS(obj) \ + OBJECT_GET_CLASS(SBSA_GWDTClass, (obj), TYPE_WDT_SBSA_GWDT) + +/* SBSA Generic Watchdog register definitions */ +/* refresh frame */ +#define SBSA_GWDT_WRR 0x000 + +/* control frame */ +#define SBSA_GWDT_WCS 0x000 +#define SBSA_GWDT_WOR 0x008 +#define SBSA_GWDT_WORU 0x00C +#define SBSA_GWDT_WCV 0x010 +#define SBSA_GWDT_WCVU 0x014 + +/* Watchdog Interface Identification Register */ +#define SBSA_GWDT_W_IIDR 0xFCC + +/* Watchdog Control and Status Register Bits */ +#define SBSA_GWDT_WCS_EN BIT(0) +#define SBSA_GWDT_WCS_WS0 BIT(1) +#define SBSA_GWDT_WCS_WS1 BIT(2) + +#define SBSA_GWDT_WOR_MASK 0x0000FFFF + +/* Watchdog Interface Identification Register definition*/ +#define SBSA_GWDT_ID 0x1043B + +/* 2 Separate memory regions for each of refresh & control register frames */ +#define SBSA_GWDT_RMMIO_SIZE 0x1000 +#define SBSA_GWDT_CMMIO_SIZE 0x1000 + +#define SBSA_TIMER_FREQ 62500000 /* Hz */ + +typedef struct SBSA_GWDTState { + /* */ + SysBusDevice parent_obj; + + /*< public >*/ + MemoryRegion rmmio; + MemoryRegion cmmio; + qemu_irq irq; + + QEMUTimer *ptimer, *timer; + + uint32_t id; + uint32_t wrr; + uint32_t wcs; + uint32_t worl; + uint32_t woru; + uint32_t wcvl; + uint32_t wcvu; + bool enabled; + bool ws0, ws1; + + /*< public >*/ +} SBSA_GWDTState; + +#endif /* WDT_SBSA_GWDT_H */