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[82.135.86.174]) by smtp.googlemail.com with ESMTPSA id n30-20020a05600c501e00b003edc9a5f98asm1466280wmr.44.2023.03.29.01.46.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 29 Mar 2023 01:46:04 -0700 (PDT) From: Johannes Thumshirn To: qemu-devel@nongnu.org Cc: Alistair Francis , Javier Rodriguez , Dmitry Fomichev , Johannes Thumshirn Subject: [PATCH 4/4] wdt_z069: Add support for MEN 16z069 Watchdog Date: Wed, 29 Mar 2023 10:45:13 +0200 Message-Id: <20230329084513.7835-5-jth@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230329084513.7835-1-jth@kernel.org> References: <20230329084513.7835-1-jth@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=209.85.128.49; envelope-from=morbidrsa@gmail.com; helo=mail-wm1-f49.google.com X-Spam_score_int: -13 X-Spam_score: -1.4 X-Spam_bar: - X-Spam_report: (-1.4 / 5.0 requ) BAYES_00=-1.9, FREEMAIL_FORGED_FROMDOMAIN=0.25, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.25, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-Mailman-Approved-At: Wed, 29 Mar 2023 09:08:07 -0400 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-bounces+qemu-devel=archiver.kernel.org@nongnu.org Add 16z069 Watchdog over MEN Chameleon BUS emulation. Signed-off-by: Johannes Thumshirn --- hw/watchdog/Kconfig | 5 + hw/watchdog/meson.build | 1 + hw/watchdog/wdt_z069.c | 218 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 224 insertions(+) create mode 100644 hw/watchdog/wdt_z069.c diff --git a/hw/watchdog/Kconfig b/hw/watchdog/Kconfig index 66e1d029e3..a3f1196f66 100644 --- a/hw/watchdog/Kconfig +++ b/hw/watchdog/Kconfig @@ -20,3 +20,8 @@ config WDT_IMX2 config WDT_SBSA bool + +config WDT_Z069 + bool + default y if MCB + depends on MCB diff --git a/hw/watchdog/meson.build b/hw/watchdog/meson.build index 8974b5cf4c..7bc353774e 100644 --- a/hw/watchdog/meson.build +++ b/hw/watchdog/meson.build @@ -6,4 +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')) +softmmu_ss.add(when: 'CONFIG_WDT_Z069', if_true: files('wdt_z069.c')) specific_ss.add(when: 'CONFIG_PSERIES', if_true: files('spapr_watchdog.c')) diff --git a/hw/watchdog/wdt_z069.c b/hw/watchdog/wdt_z069.c new file mode 100644 index 0000000000..cb67519032 --- /dev/null +++ b/hw/watchdog/wdt_z069.c @@ -0,0 +1,218 @@ +/* + * QEMU MEN 16z069 Watchdog over MCB emulation + * + * Copyright (C) 2023 Johannes Thumshirn + * + * This work is licensed under the terms of the GNU GPL, version 2. See + * the COPYING file in the top-level directory. + */ +#include "qemu/osdep.h" +#include "qemu/module.h" +#include "qemu/timer.h" +#include "sysemu/watchdog.h" +#include "hw/mcb/mcb.h" +#include "migration/vmstate.h" +#include "hw/qdev-properties.h" + +/* #define Z069_DEBUG 1 */ + +#ifdef Z069_DEBUG +#define z069_debug(fmt, ...) \ + fprintf(stderr, "wdt_z069: %s: "fmt, __func__, ##__VA_ARGS__) +#else +#define z069_debug(fmt, ...) +#endif + +#define MEN_Z069_WTR 0x10 +#define MEN_Z069_WTR_WDEN BIT(15) +#define MEN_Z069_WTR_WDET_MASK 0x7fff +#define MEN_Z069_WVR 0x14 + +#define CLK_500(x) ((x) * 2) /* 500Hz in ms */ + +typedef struct { + /*< private >*/ + MCBDevice dev; + + /*< public >*/ + QEMUTimer *timer; + + bool enabled; + unsigned int timeout; + + MemoryRegion mmio; + + /* Registers */ + uint16_t wtr; + uint16_t wvr; +} MENZ069State; + +static void men_z069_wdt_enable(MENZ069State *s) +{ + z069_debug("next timeout will fire in +%dms\n", s->timeout); + timer_mod(s->timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + s->timeout); +} + +static void men_z069_wdt_disable(MENZ069State *s) +{ + timer_del(s->timer); +} + +static uint64_t men_z069_wdt_read(void *opaque, hwaddr addr, unsigned size) +{ + MENZ069State *s = opaque; + uint64_t ret; + + switch (addr) { + case MEN_Z069_WTR: + ret = s->wtr; + break; + case MEN_Z069_WVR: + ret = s->wvr; + break; + default: + ret = 0UL; + break; + } + + z069_debug("returning: 0x%"PRIx64" @ 0x%lx\n", ret, addr); + return ret; +} + +static void men_z069_wdt_write(void *opaque, hwaddr addr, uint64_t v, + unsigned size) +{ + MENZ069State *s = opaque; + bool old_ena = s->enabled; + uint16_t val = v & 0xffff; + uint16_t tout; + + z069_debug("got: 0x%"PRIx64" @ 0x%lx\n", v, addr); + + switch (addr) { + case MEN_Z069_WTR: + s->wtr = val; + tout = val & MEN_Z069_WTR_WDET_MASK; + s->timeout = CLK_500(tout); + s->enabled = val & MEN_Z069_WTR_WDEN; + z069_debug("new timeout: %u (0x%x) %u\n", tout, tout, s->timeout); + + if (old_ena && !s->enabled) { + men_z069_wdt_disable(s); + } else if (!old_ena && s->enabled) { + men_z069_wdt_enable(s); + } + + break; + case MEN_Z069_WVR: + /* The watchdog trigger value toggles between 0x5555 and 0xaaaa */ + if (val == (s->wvr ^ 0xffff)) { + s->wvr = val; + z069_debug("watchdog triggered, next timeout will fire in +%dms\n", + s->timeout); + timer_mod(s->timer, + qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + s->timeout); + } + break; + default: + break; + } + return; +} + +static const MemoryRegionOps men_z069_io_ops = { + .read = men_z069_wdt_read, + .write = men_z069_wdt_write, + .endianness = DEVICE_LITTLE_ENDIAN, + .valid = { + .min_access_size = 4, + .max_access_size = 4 + }, + .impl = { + .min_access_size = 4, + .max_access_size = 4 + }, +}; + +static void men_z069_timer_expired(void *opaque) +{ + MENZ069State *s = opaque; + + watchdog_perform_action(); + timer_del(s->timer); +} + +static void men_z069_wdt_realize(DeviceState *dev, Error **errp) +{ + MCBDevice *mdev = MCB_DEVICE(dev); + MENZ069State *s = DO_UPCAST(MENZ069State, dev, mdev); + MCBus *bus = MCB_BUS(qdev_get_parent_bus(DEVICE(dev))); + + mdev->gdd = mcb_new_chameleon_descriptor(bus, 69, mdev->rev, + mdev->var, 0x18); + if (!mdev->gdd) { + return; + } + + s->wvr = 0x5555; + s->wtr = 0x7fff; + s->timeout = CLK_500(s->wtr & MEN_Z069_WTR_WDET_MASK); + s->timer = timer_new_ms(QEMU_CLOCK_VIRTUAL, + men_z069_timer_expired, s); + + memory_region_init_io(&s->mmio, OBJECT(s), + &men_z069_io_ops, s, "z069.wdt", 0x16); + memory_region_add_subregion(&bus->mmio_region, mdev->gdd->offset, + &s->mmio); +} + +static void men_z069_wdt_unrealize(DeviceState *dev) +{ + MCBDevice *mdev = MCB_DEVICE(dev); + + g_free(&mdev->gdd); +} + +static const VMStateDescription vmstate_z069_wdt = { + .name = "z069-wdt", + .version_id = 1, + .minimum_version_id = 1, + .fields = (VMStateField[]) { + VMSTATE_MCB_DEVICE(dev, MENZ069State), + VMSTATE_TIMER_PTR(timer, MENZ069State), + VMSTATE_END_OF_LIST() + } +}; + +static Property men_z069_wdt_properties[] = { + DEFINE_PROP_UINT8("rev", MENZ069State, dev.rev, 0), + DEFINE_PROP_UINT8("var", MENZ069State, dev.var, 0), + DEFINE_PROP_END_OF_LIST(), +}; + +static void men_z069_wdt_class_intifn(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + MCBDeviceClass *mc = MCB_DEVICE_CLASS(klass); + + mc->realize = men_z069_wdt_realize; + mc->unrealize = men_z069_wdt_unrealize; + + dc->desc = "MEN 16z069 Watchdog Timer"; + dc->vmsd = &vmstate_z069_wdt; + device_class_set_props(dc, men_z069_wdt_properties); +} + +static const TypeInfo men_z069_wdt_info = { + .name = "z069-wdt", + .parent = TYPE_MCB_DEVICE, + .instance_size = sizeof(MENZ069State), + .class_init = men_z069_wdt_class_intifn, +}; + +static void men_z069_wdt_register_types(void) +{ + type_register_static(&men_z069_wdt_info); +} + +type_init(men_z069_wdt_register_types); -- 2.39.2