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Date: Thu, 22 Sep 2022 01:41:05 -0700 Message-Id: <20220922084107.2834285-2-tommy.wu@sifive.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20220922084107.2834285-1-tommy.wu@sifive.com> References: <20220922084107.2834285-1-tommy.wu@sifive.com> MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::435; envelope-from=tommy.wu@sifive.com; helo=mail-pf1-x435.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, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" The watchdog timer is in the always-on domain device of HiFive 1 rev b, so this patch added the AON device to the sifive_e machine. This patch only implemented the functionality of the watchdog timer. Signed-off-by: Tommy Wu Reviewed-by: Frank Chang --- hw/misc/Kconfig | 3 + hw/misc/meson.build | 1 + hw/misc/sifive_e_aon.c | 330 +++++++++++++++++++++++++++++++++ include/hw/misc/sifive_e_aon.h | 87 +++++++++ 4 files changed, 421 insertions(+) create mode 100644 hw/misc/sifive_e_aon.c create mode 100644 include/hw/misc/sifive_e_aon.h diff --git a/hw/misc/Kconfig b/hw/misc/Kconfig index cbabe9f78c..7d1247822e 100644 --- a/hw/misc/Kconfig +++ b/hw/misc/Kconfig @@ -162,6 +162,9 @@ config SIFIVE_TEST config SIFIVE_E_PRCI bool +config SIFIVE_E_AON + bool + config SIFIVE_U_OTP bool diff --git a/hw/misc/meson.build b/hw/misc/meson.build index 95268eddc0..1536a0cc2e 100644 --- a/hw/misc/meson.build +++ b/hw/misc/meson.build @@ -30,6 +30,7 @@ softmmu_ss.add(when: 'CONFIG_MCHP_PFSOC_DMC', if_true: files('mchp_pfsoc_dmc.c') softmmu_ss.add(when: 'CONFIG_MCHP_PFSOC_IOSCB', if_true: files('mchp_pfsoc_ioscb.c')) softmmu_ss.add(when: 'CONFIG_MCHP_PFSOC_SYSREG', if_true: files('mchp_pfsoc_sysreg.c')) softmmu_ss.add(when: 'CONFIG_SIFIVE_TEST', if_true: files('sifive_test.c')) +softmmu_ss.add(when: 'CONFIG_SIFIVE_E_AON', if_true: files('sifive_e_aon.c')) softmmu_ss.add(when: 'CONFIG_SIFIVE_E_PRCI', if_true: files('sifive_e_prci.c')) softmmu_ss.add(when: 'CONFIG_SIFIVE_U_OTP', if_true: files('sifive_u_otp.c')) softmmu_ss.add(when: 'CONFIG_SIFIVE_U_PRCI', if_true: files('sifive_u_prci.c')) diff --git a/hw/misc/sifive_e_aon.c b/hw/misc/sifive_e_aon.c new file mode 100644 index 0000000000..7773dfb168 --- /dev/null +++ b/hw/misc/sifive_e_aon.c @@ -0,0 +1,330 @@ +/* + * SiFive HiFive1 AON (Always On Domain) for QEMU. + * + * Copyright (c) 2022 SiFive, Inc. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2 or later, as published by the Free Software Foundation. + * + * This program is distributed in the hope 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 . + */ + +#include "qemu/osdep.h" +#include "qapi/error.h" +#include "qemu/timer.h" +#include "qemu/log.h" +#include "hw/irq.h" +#include "sysemu/watchdog.h" +#include "qapi/visitor.h" +#include "hw/misc/sifive_e_aon.h" + +static void sifive_e_aon_wdt_update_wdogcount(SiFiveEAONState *r) +{ + if (0 == r->wdogcfg.wdogenalways && + 0 == r->wdogcfg.wdogencoreawake) { + return; + } + int64_t now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); + r->wdogcount += muldiv64(now - r->wdog_restart_time, + r->wdogclk_freq, NANOSECONDS_PER_SECOND); + /* Clean the most significant bit. */ + r->wdogcount = ((r->wdogcount << 1) >> 1); + r->wdog_restart_time = now; +} + +static void sifive_e_aon_wdt_update_state(SiFiveEAONState *r) +{ + sifive_e_aon_wdt_update_wdogcount(r); + uint16_t wdogs = (uint16_t)(r->wdogcount >> r->wdogcfg.wdogscale); + bool cmp_signal = false; + if (wdogs >= r->wdogcmp0) { + cmp_signal = true; + if (1 == r->wdogcfg.wdogzerocmp) { + r->wdogcount = 0; + wdogs = 0; + } + } + + if (cmp_signal) { + if (1 == r->wdogcfg.wdogrsten) { + watchdog_perform_action(); + } + r->wdogcfg.wdogip0 = 1; + } + + qemu_set_irq(r->wdog_irq, r->wdogcfg.wdogip0); + + if (wdogs < r->wdogcmp0 && + (r->wdogcfg.wdogenalways || + r->wdogcfg.wdogencoreawake)) { + int64_t next = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); + next += muldiv64((r->wdogcmp0 - wdogs) << r->wdogcfg.wdogscale, + NANOSECONDS_PER_SECOND, r->wdogclk_freq); + timer_mod(r->wdog_timer, next); + } else { + timer_mod(r->wdog_timer, INT64_MAX); + } +} + +/* + * Callback used when the timer set using timer_mod expires. + */ +static void sifive_e_aon_wdt_expired_cb(void *opaque) +{ + SiFiveEAONState *r = SIFIVE_E_AON(opaque); + sifive_e_aon_wdt_update_state(r); +} + +static uint64_t +sifive_e_aon_wdt_read(void *opaque, hwaddr addr, unsigned int size) +{ + SiFiveEAONState *r = SIFIVE_E_AON(opaque); + + switch (addr) { + case SIFIVE_E_AON_WDT_WDOGCFG: + return r->wdogcfg.value; + case SIFIVE_E_AON_WDT_WDOGCOUNT: + sifive_e_aon_wdt_update_wdogcount(r); + return r->wdogcount; + case SIFIVE_E_AON_WDT_WDOGS: + sifive_e_aon_wdt_update_wdogcount(r); + return r->wdogcount >> r->wdogcfg.wdogscale; + case SIFIVE_E_AON_WDT_WDOGFEED: + return 0; + case SIFIVE_E_AON_WDT_WDOGKEY: + return r->wdogunlock; + case SIFIVE_E_AON_WDT_WDOGCMP0: + return r->wdogcmp0; + default: + qemu_log_mask(LOG_GUEST_ERROR, "%s: bad read: addr=0x%x\n", + __func__, (int)addr); + } + + return 0; +} + +static void +sifive_e_aon_wdt_write(void *opaque, hwaddr addr, + uint64_t val64, unsigned int size) +{ + SiFiveEAONState *r = SIFIVE_E_AON(opaque); + uint32_t value = val64; + + switch (addr) { + case SIFIVE_E_AON_WDT_WDOGCFG: + if (0 == r->wdogunlock) { + return; + } + wdogcfg_s new_wdogcfg; + new_wdogcfg.value = value; + if (1 == (r->wdogcfg.wdogenalways || + r->wdogcfg.wdogencoreawake) && + 0 == (new_wdogcfg.wdogenalways || + new_wdogcfg.wdogencoreawake)) { + sifive_e_aon_wdt_update_wdogcount(r); + } else if (0 == (r->wdogcfg.wdogenalways || + r->wdogcfg.wdogencoreawake) && + 1 == (new_wdogcfg.wdogenalways || + new_wdogcfg.wdogencoreawake)) { + r->wdog_restart_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); + } + r->wdogcfg.value = value; + r->wdogunlock = 0; + break; + case SIFIVE_E_AON_WDT_WDOGCOUNT: + if (0 == r->wdogunlock) { + return; + } + r->wdogcount = ((value << 1) >> 1); + r->wdog_restart_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); + r->wdogunlock = 0; + break; + case SIFIVE_E_AON_WDT_WDOGS: + return; + case SIFIVE_E_AON_WDT_WDOGFEED: + if (0 == r->wdogunlock) { + return; + } + if (SIFIVE_E_AON_WDOGFEED == value) { + r->wdogcount = 0; + r->wdog_restart_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); + } + r->wdogunlock = 0; + break; + case SIFIVE_E_AON_WDT_WDOGKEY: + if (SIFIVE_E_AON_WDOGKEY == value) { + r->wdogunlock = 1; + } + break; + case SIFIVE_E_AON_WDT_WDOGCMP0: + if (0 == r->wdogunlock) { + return; + } + r->wdogcmp0 = (uint16_t) value; + r->wdogunlock = 0; + break; + default: + qemu_log_mask(LOG_GUEST_ERROR, "%s: bad write: addr=0x%x v=0x%x\n", + __func__, (int)addr, (int)value); + } + + sifive_e_aon_wdt_update_state(r); +} + +static uint64_t +sifive_e_aon_read(void *opaque, hwaddr addr, unsigned int size) +{ + if (addr < SIFIVE_E_AON_RTC_RTCCFG) { + /* AON WDT */ + return sifive_e_aon_wdt_read(opaque, addr, size); + } else if (addr < SIFIVE_E_AON_LFROSC_LFROSCCFG) { + /* AON RTC */ + } else if (addr < SIFIVE_E_AON_BACKUP_BACKUP0) { + /* AON LFROSC */ + } else if (addr < SIFIVE_E_AON_PMU_PMUWAKEUP0) { + /* AON BACKUP */ + } else if (addr < SIFIVE_E_AON_MAX) { + /* AON PMU */ + } else { + qemu_log_mask(LOG_GUEST_ERROR, "%s: bad read: addr=0x%x\n", + __func__, (int)addr); + } + + return 0; +} + +static void +sifive_e_aon_write(void *opaque, hwaddr addr, + uint64_t val64, unsigned int size) +{ + if (addr < SIFIVE_E_AON_RTC_RTCCFG) { + /* AON WDT */ + sifive_e_aon_wdt_write(opaque, addr, val64, size); + } else if (addr < SIFIVE_E_AON_LFROSC_LFROSCCFG) { + /* AON RTC */ + } else if (addr < SIFIVE_E_AON_BACKUP_BACKUP0) { + /* AON LFROSC */ + } else if (addr < SIFIVE_E_AON_PMU_PMUWAKEUP0) { + /* AON BACKUP */ + } else if (addr < SIFIVE_E_AON_MAX) { + /* AON PMU */ + } else { + qemu_log_mask(LOG_GUEST_ERROR, "%s: bad read: addr=0x%x\n", + __func__, (int)addr); + } +} + +static const MemoryRegionOps sifive_e_aon_ops = { + .read = sifive_e_aon_read, + .write = sifive_e_aon_write, + .endianness = DEVICE_NATIVE_ENDIAN, + .impl = { + .min_access_size = 4, + .max_access_size = 4 + }, + .valid = { + .min_access_size = 4, + .max_access_size = 4 + } +}; + +SiFiveEAONState *sifive_e_aon_create(MemoryRegion *mr, hwaddr base, + qemu_irq wdt_irq) +{ + DeviceState *dev; + SysBusDevice *s; + SiFiveEAONState *r; + + dev = qdev_new(TYPE_SIFIVE_E_AON); + s = SYS_BUS_DEVICE(dev); + + sysbus_realize_and_unref(s, &error_fatal); + + memory_region_add_subregion(mr, base, + sysbus_mmio_get_region(s, 0)); + sysbus_connect_irq(s, 0, wdt_irq); + + r = SIFIVE_E_AON(dev); + return r; +} + +static void sifive_e_aon_reset(DeviceState *dev) +{ + SiFiveEAONState *s = SIFIVE_E_AON(dev); + + s->wdogcfg.wdogrsten = 0; + s->wdogcfg.wdogenalways = 0; + s->wdogcfg.wdogencoreawake = 0; + s->wdogcmp0 = 0xbeef; +} + +static void sifive_e_aon_wdt_update_wdogclk_freq(Object *obj, Visitor *v, + const char *name, + void *opaque, + Error **errp) { + SiFiveEAONState *r = SIFIVE_E_AON(opaque); + uint64_t value; + if (!visit_type_uint64(v, name, &value, errp)) { + return; + } + + r->wdogclk_freq = value; + sifive_e_aon_wdt_update_state(r); +} + +static void sifive_e_aon_init(Object *obj) +{ + SysBusDevice *sbd = SYS_BUS_DEVICE(obj); + SiFiveEAONState *s = SIFIVE_E_AON(obj); + + memory_region_init_io(&s->mmio, OBJECT(s), &sifive_e_aon_ops, s, + TYPE_SIFIVE_E_AON, SIFIVE_E_AON_MAX); + sysbus_init_mmio(sbd, &s->mmio); + + /* watchdog timer */ + s->wdogclk_freq = SIFIVE_E_LFCLK_DEFAULT_FREQ; + sysbus_init_irq(sbd, &s->wdog_irq); + object_property_add(obj, "wdogclk-frequency", "uint64", + NULL, + sifive_e_aon_wdt_update_wdogclk_freq, + NULL, s); +} + +static void sifive_e_aon_realize(DeviceState *dev, Error **errp) +{ + SiFiveEAONState *s = SIFIVE_E_AON(dev); + + /* watchdog timer */ + s->wdog_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, + sifive_e_aon_wdt_expired_cb, s); +} + +static void sifive_e_aon_class_init(ObjectClass *oc, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(oc); + + dc->realize = sifive_e_aon_realize; + dc->reset = sifive_e_aon_reset; +} + +static const TypeInfo sifive_e_aon_info = { + .name = TYPE_SIFIVE_E_AON, + .parent = TYPE_SYS_BUS_DEVICE, + .instance_size = sizeof(SiFiveEAONState), + .instance_init = sifive_e_aon_init, + .class_init = sifive_e_aon_class_init, +}; + +static void sifive_e_aon_register_types(void) +{ + type_register_static(&sifive_e_aon_info); +} + +type_init(sifive_e_aon_register_types) diff --git a/include/hw/misc/sifive_e_aon.h b/include/hw/misc/sifive_e_aon.h new file mode 100644 index 0000000000..ee4134bd25 --- /dev/null +++ b/include/hw/misc/sifive_e_aon.h @@ -0,0 +1,87 @@ +/* + * SiFive HiFive1 AON (Always On Domain) interface. + * + * Copyright (c) 2022 SiFive, Inc. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2 or later, as published by the Free Software Foundation. + * + * This program is distributed in the hope 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 . + */ + +#ifndef HW_SIFIVE_AON_H +#define HW_SIFIVE_AON_H + +#include "hw/sysbus.h" +#include "qom/object.h" + +#define TYPE_SIFIVE_E_AON "riscv.sifive.e.aon" +OBJECT_DECLARE_SIMPLE_TYPE(SiFiveEAONState, SIFIVE_E_AON) + +#define SIFIVE_E_AON_WDOGKEY (0x51F15E) +#define SIFIVE_E_AON_WDOGFEED (0xD09F00D) +#define SIFIVE_E_LFCLK_DEFAULT_FREQ (32768) + +enum { + SIFIVE_E_AON_WDT_WDOGCFG = 0, + SIFIVE_E_AON_WDT_WDOGCOUNT = 0x8, + SIFIVE_E_AON_WDT_WDOGS = 0x10, + SIFIVE_E_AON_WDT_WDOGFEED = 0x18, + SIFIVE_E_AON_WDT_WDOGKEY = 0x1c, + SIFIVE_E_AON_WDT_WDOGCMP0 = 0x20, + SIFIVE_E_AON_RTC_RTCCFG = 0x40, + SIFIVE_E_AON_LFROSC_LFROSCCFG = 0x70, + SIFIVE_E_AON_BACKUP_BACKUP0 = 0x80, + SIFIVE_E_AON_PMU_PMUWAKEUP0 = 0x100, + SIFIVE_E_AON_MAX = 0x150 +}; + +typedef struct wdogcfg_s wdogcfg_s; +struct wdogcfg_s { + union { + uint32_t value; + struct { + uint32_t wdogscale:4; + uint32_t reserved:4; + uint8_t wdogrsten:1; + uint8_t wdogzerocmp:1; + uint8_t reserved2:2; + uint8_t wdogenalways:1; + uint8_t wdogencoreawake:1; + uint32_t reserved3:14; + uint8_t wdogip0:1; + uint8_t reserved4:3; + }; + }; +}; + +struct SiFiveEAONState { + /*< private >*/ + SysBusDevice parent_obj; + + /*< public >*/ + MemoryRegion mmio; + + /*< watchdog timer >*/ + QEMUTimer *wdog_timer; + qemu_irq wdog_irq; + uint64_t wdog_restart_time; + uint64_t wdogclk_freq; + + wdogcfg_s wdogcfg; + uint16_t wdogcmp0; + uint32_t wdogcount; + uint8_t wdogunlock; +}; + +SiFiveEAONState *sifive_e_aon_create(MemoryRegion *mr, hwaddr base, + qemu_irq irq); + +#endif