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Tue, 24 Sep 2019 13:12:03 +0000 From: Anup Patel To: Peter Maydell , Palmer Dabbelt , Alistair Francis , Sagar Karandikar , Bastian Koppelmann Subject: [PATCH v2 1/2] hw: timer: Add Goldfish RTC device Thread-Topic: [PATCH v2 1/2] hw: timer: Add Goldfish RTC device Thread-Index: AQHVctmnZsqCfyFEDEKNZLG9WEX7cA== Date: Tue, 24 Sep 2019 13:12:02 +0000 Message-ID: <20190924131131.118155-2-anup.patel@wdc.com> References: <20190924131131.118155-1-anup.patel@wdc.com> In-Reply-To: <20190924131131.118155-1-anup.patel@wdc.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: MA1PR01CA0148.INDPRD01.PROD.OUTLOOK.COM (2603:1096:a00:71::18) To MN2PR04MB6061.namprd04.prod.outlook.com (2603:10b6:208:d8::15) authentication-results: spf=none (sender IP is ) smtp.mailfrom=Anup.Patel@wdc.com; x-ms-exchange-messagesentrepresentingtype: 1 x-mailer: git-send-email 2.17.1 x-originating-ip: [49.207.51.80] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: dbc125b5-437f-402c-84a2-08d740f0ca65 x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: BCL:0; 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DIR:OUT; SFP:1102; SCL:1; SRVR:MN2PR04MB6318; H:MN2PR04MB6061.namprd04.prod.outlook.com; FPR:; SPF:None; LANG:en; PTR:InfoNoRecords; A:1; MX:1; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: WNQm9UETlJYxzp+ChfAkxhSWF7SSnA3op20BTHP+/ZMXaso4OVPE7RM56YkUXzVfuMFSxBvZ9JcwmyIgfGELcdo2QqU9Dni+Zo3oSVXmTNdS2p1GQgUpy5lMRAlzhbyrox86lZmDaPpUl5/I6FWYhbDgzUim3pa84nrK1XRL00XCPqRpsY06npw+xW/IQs7cvchdAit2aPGwOvFZFTMXL+ZLZmDHDWjdb8Exbgfb7n7OXC2SmYxPd2UImRb2T569CpwdswDj5VD3gjkbleD+vd6qI7DStFZyEL5VxD+QMa48MDk2OscqdYdMrAFpx9SjQQ3h9r/J0jnMlzZ2Rw7Fg/Q1IL2Ah21vEpklYuGDSgIase7ZqUbSbLnWIGXqK0VV+X7DRkmxR0pcgDlxEwkUpAv+LRmKjO9ZiWjZyJEVKIaQYtBFxUktKywIoGCa9TL8cmdgAA5fnO+ZveK3e6rXYw== Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: wdc.com X-MS-Exchange-CrossTenant-Network-Message-Id: dbc125b5-437f-402c-84a2-08d740f0ca65 X-MS-Exchange-CrossTenant-originalarrivaltime: 24 Sep 2019 13:12:02.9703 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: b61c8803-16f3-4c35-9b17-6f65f441df86 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: lke/v7EPXbHqas1mbCsWUj2rO5aLevoRT8xQXCyUnZAlbyhVgEvAwIwNBk4TDj9D44IhNPxPVrGxe2xrEa1myw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR04MB6318 X-detected-operating-system: by eggs.gnu.org: FreeBSD 9.x X-Received-From: 216.71.154.42 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: Atish Patra , Anup Patel , "qemu-riscv@nongnu.org" , "qemu-devel@nongnu.org" , Anup Patel Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" This patch adds model for Google Goldfish virtual platform RTC device. We will be adding Goldfish RTC device to the QEMU RISC-V virt machine for providing real date-time to Guest Linux. The corresponding Linux driver for Goldfish RTC device is already available in upstream Linux. For now, VM migration support is not available for Goldfish RTC device but it will be added later when we implement VM migration for KVM RISC-V. Signed-off-by: Anup Patel --- hw/timer/Kconfig | 3 + hw/timer/Makefile.objs | 1 + hw/timer/goldfish_rtc.c | 278 ++++++++++++++++++++++++++++++++ include/hw/timer/goldfish_rtc.h | 46 ++++++ 4 files changed, 328 insertions(+) create mode 100644 hw/timer/goldfish_rtc.c create mode 100644 include/hw/timer/goldfish_rtc.h diff --git a/hw/timer/Kconfig b/hw/timer/Kconfig index eefc95f35e..bd1831fbe8 100644 --- a/hw/timer/Kconfig +++ b/hw/timer/Kconfig @@ -58,3 +58,6 @@ config CMSDK_APB_TIMER config CMSDK_APB_DUALTIMER bool select PTIMER + +config GOLDFISH_RTC + bool diff --git a/hw/timer/Makefile.objs b/hw/timer/Makefile.objs index 123d92c969..5dc6f880af 100644 --- a/hw/timer/Makefile.objs +++ b/hw/timer/Makefile.objs @@ -47,3 +47,4 @@ common-obj-$(CONFIG_SUN4V_RTC) +=3D sun4v-rtc.o common-obj-$(CONFIG_CMSDK_APB_TIMER) +=3D cmsdk-apb-timer.o common-obj-$(CONFIG_CMSDK_APB_DUALTIMER) +=3D cmsdk-apb-dualtimer.o common-obj-$(CONFIG_MSF2) +=3D mss-timer.o +common-obj-$(CONFIG_GOLDFISH_RTC) +=3D goldfish_rtc.o diff --git a/hw/timer/goldfish_rtc.c b/hw/timer/goldfish_rtc.c new file mode 100644 index 0000000000..223616ed75 --- /dev/null +++ b/hw/timer/goldfish_rtc.c @@ -0,0 +1,278 @@ +/* + * Goldfish virtual platform RTC + * + * Copyright (C) 2019 Western Digital Corporation or its affiliates. + * + * For more details on Google Goldfish virtual platform refer: + * https://android.googlesource.com/platform/external/qemu/+/master/docs/G= OLDFISH-VIRTUAL-HARDWARE.TXT + * + * 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 f= or + * 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 "qemu-common.h" +#include "hw/timer/goldfish_rtc.h" +#include "migration/vmstate.h" +#include "hw/irq.h" +#include "hw/qdev-properties.h" +#include "hw/sysbus.h" +#include "qemu/timer.h" +#include "sysemu/sysemu.h" +#include "qemu/cutils.h" +#include "qemu/log.h" + +#define RTC_TIME_LOW 0x00 +#define RTC_TIME_HIGH 0x04 +#define RTC_ALARM_LOW 0x08 +#define RTC_ALARM_HIGH 0x0c +#define RTC_IRQ_ENABLED 0x10 +#define RTC_CLEAR_ALARM 0x14 +#define RTC_ALARM_STATUS 0x18 +#define RTC_CLEAR_INTERRUPT 0x1c + +static void goldfish_rtc_update(GoldfishRTCState *s) +{ + qemu_set_irq(s->irq, (s->irq_pending & s->irq_enabled) ? 1 : 0); +} + +static void goldfish_rtc_interrupt(void *opaque) +{ + GoldfishRTCState *s =3D (GoldfishRTCState *)opaque; + + s->alarm_running =3D 0; + s->irq_pending =3D 1; + goldfish_rtc_update(s); +} + +static uint64_t goldfish_rtc_get_count(GoldfishRTCState *s) +{ + return s->tick_offset + (uint64_t)qemu_clock_get_ns(rtc_clock); +} + +static void goldfish_rtc_clear_alarm(GoldfishRTCState *s) +{ + timer_del(s->timer); + s->alarm_running =3D 0; +} + +static void goldfish_rtc_set_alarm(GoldfishRTCState *s) +{ + uint64_t ticks =3D goldfish_rtc_get_count(s); + uint64_t event =3D s->alarm_next; + + if (event <=3D ticks) { + goldfish_rtc_clear_alarm(s); + goldfish_rtc_interrupt(s); + } else { + int64_t now =3D qemu_clock_get_ns(rtc_clock); + timer_mod(s->timer, now + (event - ticks)); + s->alarm_running =3D 1; + } +} + +static uint64_t goldfish_rtc_read(void *opaque, hwaddr offset, + unsigned size) +{ + GoldfishRTCState *s =3D (GoldfishRTCState *)opaque; + uint64_t r; + + switch (offset) { + case RTC_TIME_LOW: + r =3D goldfish_rtc_get_count(s) & 0xffffffff; + break; + case RTC_TIME_HIGH: + r =3D goldfish_rtc_get_count(s) >> 32; + break; + case RTC_ALARM_LOW: + r =3D s->alarm_next & 0xffffffff; + break; + case RTC_ALARM_HIGH: + r =3D s->alarm_next >> 32; + break; + case RTC_IRQ_ENABLED: + r =3D s->irq_enabled; + break; + case RTC_ALARM_STATUS: + r =3D s->alarm_running; + break; + default: + qemu_log_mask(LOG_GUEST_ERROR, + "goldfish_rtc_read: Bad offset 0x%x\n", (int)offset)= ; + r =3D 0; + break; + } + + return r; +} + +static void goldfish_rtc_write(void *opaque, hwaddr offset, + uint64_t value, unsigned size) +{ + uint64_t current_tick, new_tick; + GoldfishRTCState *s =3D (GoldfishRTCState *)opaque; + + switch (offset) { + case RTC_TIME_LOW: + current_tick =3D goldfish_rtc_get_count(s); + new_tick =3D current_tick & (0xffffffffULL << 32); + new_tick |=3D value; + s->tick_offset +=3D new_tick - current_tick; + break; + case RTC_TIME_HIGH: + current_tick =3D goldfish_rtc_get_count(s); + new_tick =3D current_tick & 0xffffffffULL; + new_tick |=3D (value << 32); + s->tick_offset +=3D new_tick - current_tick; + break; + case RTC_ALARM_LOW: + s->alarm_next &=3D (0xffffffffULL << 32); + s->alarm_next |=3D value; + goldfish_rtc_set_alarm(s); + break; + case RTC_ALARM_HIGH: + s->alarm_next &=3D 0xffffffffULL; + s->alarm_next |=3D (value << 32); + break; + case RTC_IRQ_ENABLED: + s->irq_enabled =3D (uint32_t)(value & 0x1); + goldfish_rtc_update(s); + break; + case RTC_CLEAR_ALARM: + goldfish_rtc_clear_alarm(s); + break; + case RTC_CLEAR_INTERRUPT: + s->irq_pending =3D 0; + goldfish_rtc_update(s); + break; + default: + qemu_log_mask(LOG_GUEST_ERROR, + "goldfish_rtc_write: Bad offset 0x%x\n", (int)offset= ); + break; + } +} + +static int goldfish_rtc_pre_save(void *opaque) +{ + uint64_t delta; + GoldfishRTCState *s =3D opaque; + + /* + * We want to migrate this offset, which sounds straightforward. + * Unfortunately, we cannot directly pass tick_offset because + * rtc_clock on destinetion Host might not be same source Host. + * + * To tackle, this we pass tick_offset relative to vm_clock from + * source Host and make it relative to rtc_clock at destinetion Host. + */ + delta =3D qemu_clock_get_ns(rtc_clock) - + qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); + s->tick_offset_vmstate =3D s->tick_offset + delta; + + return 0; +} + +static int goldfish_rtc_post_load(void *opaque, int version_id) +{ + uint64_t delta; + GoldfishRTCState *s =3D opaque; + + /* + * We extract tick_offset from tick_offset_vmstate by doing + * reverse math compared to pre_save() function. + */ + delta =3D qemu_clock_get_ns(rtc_clock) - + qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); + s->tick_offset =3D s->tick_offset_vmstate - delta; + + return 0; +} + +static const MemoryRegionOps goldfish_rtc_ops =3D { + .read =3D goldfish_rtc_read, + .write =3D goldfish_rtc_write, + .endianness =3D DEVICE_LITTLE_ENDIAN, + .valid =3D { + .min_access_size =3D 4, + .max_access_size =3D 4 + } +}; + +static const VMStateDescription goldfish_rtc_vmstate =3D { + .name =3D TYPE_GOLDFISH_RTC, + .version_id =3D 1, + .pre_save =3D goldfish_rtc_pre_save, + .post_load =3D goldfish_rtc_post_load, + .fields =3D (VMStateField[]) { + VMSTATE_UINT64(tick_offset_vmstate, GoldfishRTCState), + VMSTATE_UINT64(alarm_next, GoldfishRTCState), + VMSTATE_UINT32(alarm_running, GoldfishRTCState), + VMSTATE_UINT32(irq_pending, GoldfishRTCState), + VMSTATE_UINT32(irq_enabled, GoldfishRTCState), + VMSTATE_END_OF_LIST() + } +}; + +static void goldfish_rtc_reset(DeviceState *dev) +{ + GoldfishRTCState *s =3D GOLDFISH_RTC(dev); + struct tm tm; + + timer_del(s->timer); + + qemu_get_timedate(&tm, 0); + s->tick_offset =3D mktimegm(&tm); + s->tick_offset *=3D NANOSECONDS_PER_SECOND; + s->tick_offset -=3D qemu_clock_get_ns(rtc_clock); + s->tick_offset_vmstate =3D 0; + s->alarm_next =3D 0; + s->alarm_running =3D 0; + s->irq_pending =3D 0; + s->irq_enabled =3D 0; +} + +static void goldfish_rtc_realize(DeviceState *d, Error **errp) +{ + SysBusDevice *dev =3D SYS_BUS_DEVICE(d); + GoldfishRTCState *s =3D GOLDFISH_RTC(d); + + memory_region_init_io(&s->iomem, OBJECT(s), &goldfish_rtc_ops, s, + "goldfish_rtc", 0x1000); + sysbus_init_mmio(dev, &s->iomem); + + sysbus_init_irq(dev, &s->irq); + + s->timer =3D timer_new_ns(rtc_clock, goldfish_rtc_interrupt, s); +} + +static void goldfish_rtc_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc =3D DEVICE_CLASS(klass); + + dc->realize =3D goldfish_rtc_realize; + dc->reset =3D goldfish_rtc_reset; + dc->vmsd =3D &goldfish_rtc_vmstate; +} + +static const TypeInfo goldfish_rtc_info =3D { + .name =3D TYPE_GOLDFISH_RTC, + .parent =3D TYPE_SYS_BUS_DEVICE, + .instance_size =3D sizeof(GoldfishRTCState), + .class_init =3D goldfish_rtc_class_init, +}; + +static void goldfish_rtc_register_types(void) +{ + type_register_static(&goldfish_rtc_info); +} + +type_init(goldfish_rtc_register_types) diff --git a/include/hw/timer/goldfish_rtc.h b/include/hw/timer/goldfish_rt= c.h new file mode 100644 index 0000000000..dfb6d70b86 --- /dev/null +++ b/include/hw/timer/goldfish_rtc.h @@ -0,0 +1,46 @@ +/* + * Goldfish virtual platform RTC + * + * Copyright (C) 2019 Western Digital Corporation or its affiliates. + * + * For more details on Google Goldfish virtual platform refer: + * https://android.googlesource.com/platform/external/qemu/+/master/docs/G= OLDFISH-VIRTUAL-HARDWARE.TXT + * + * 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 f= or + * more details. + * + * You should have received a copy of the GNU General Public License along= with + * this program. If not, see . + */ + +#ifndef HW_TIMER_GOLDFISH_RTC_H +#define HW_TIMER_GOLDFISH_RTC_H + +#include "hw/sysbus.h" + +#define TYPE_GOLDFISH_RTC "goldfish_rtc" +#define GOLDFISH_RTC(obj) \ +OBJECT_CHECK(GoldfishRTCState, (obj), TYPE_GOLDFISH_RTC) + +typedef struct GoldfishRTCState { + SysBusDevice parent_obj; + + MemoryRegion iomem; + QEMUTimer *timer; + qemu_irq irq; + + uint64_t tick_offset; + uint64_t tick_offset_vmstate; + uint64_t alarm_next; + uint32_t alarm_running; + uint32_t irq_pending; + uint32_t irq_enabled; +} GoldfishRTCState; + +#endif --=20 2.17.1