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Iglesias" , Bernhard Beschow Subject: [PATCH 19/21] hw/rtc: Add Ricoh RS5C372 RTC emulation Date: Mon, 20 Jan 2025 21:37:46 +0100 Message-ID: <20250120203748.4687-20-shentey@gmail.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250120203748.4687-1-shentey@gmail.com> References: <20250120203748.4687-1-shentey@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::52f; envelope-from=shentey@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: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1737405800056019000 Content-Type: text/plain; charset="utf-8" The implementation just allows Linux to determine date and time. Signed-off-by: Bernhard Beschow --- MAINTAINERS | 1 + hw/rtc/rs5c372.c | 227 ++++++++++++++++++++++++++++++++++++++++++++ hw/rtc/Kconfig | 5 + hw/rtc/meson.build | 1 + hw/rtc/trace-events | 4 + 5 files changed, 238 insertions(+) create mode 100644 hw/rtc/rs5c372.c diff --git a/MAINTAINERS b/MAINTAINERS index d2cdc790ff..7531d65429 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -827,6 +827,7 @@ F: hw/arm/imx8mp-evk.c F: hw/arm/fsl-imx8mp.c F: hw/misc/imx8mp_*.c F: hw/pci-host/fsl_imx8m_phy.c +F: hw/rtc/rs5c372.c F: include/hw/arm/fsl-imx8mp.h F: include/hw/misc/imx8mp_*.h F: include/hw/pci-host/fsl_imx8m_phy.h diff --git a/hw/rtc/rs5c372.c b/hw/rtc/rs5c372.c new file mode 100644 index 0000000000..d300f93e13 --- /dev/null +++ b/hw/rtc/rs5c372.c @@ -0,0 +1,227 @@ +/* + * Ricoh RS5C372, R222x I2C RTC + * + * Copyright (c) 2025 Bernhard Beschow + * + * Based on hw/rtc/ds1338.c + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#include "qemu/osdep.h" +#include "hw/i2c/i2c.h" +#include "migration/vmstate.h" +#include "qemu/bcd.h" +#include "qom/object.h" +#include "system/rtc.h" +#include "trace.h" + +#define NVRAM_SIZE 0x10 + +/* Flags definitions */ +#define SECONDS_CH 0x80 +#define HOURS_PM 0x20 +#define CTRL2_24 0x20 + +#define TYPE_RS5C372 "rs5c372" +OBJECT_DECLARE_SIMPLE_TYPE(RS5C372State, RS5C372) + +struct RS5C372State { + I2CSlave parent_obj; + + int64_t offset; + uint8_t wday_offset; + uint8_t nvram[NVRAM_SIZE]; + uint8_t ptr; + uint8_t tx_format; + bool addr_byte; +}; + +static const VMStateDescription vmstate_rs5c372 =3D { + .name =3D "rs5c372", + .version_id =3D 1, + .minimum_version_id =3D 1, + .fields =3D (const VMStateField[]) { + VMSTATE_I2C_SLAVE(parent_obj, RS5C372State), + VMSTATE_INT64(offset, RS5C372State), + VMSTATE_UINT8_V(wday_offset, RS5C372State, 2), + VMSTATE_UINT8_ARRAY(nvram, RS5C372State, NVRAM_SIZE), + VMSTATE_UINT8(ptr, RS5C372State), + VMSTATE_UINT8(tx_format, RS5C372State), + VMSTATE_BOOL(addr_byte, RS5C372State), + VMSTATE_END_OF_LIST() + } +}; + +static void capture_current_time(RS5C372State *s) +{ + /* + * Capture the current time into the secondary registers which will be + * actually read by the data transfer operation. + */ + struct tm now; + qemu_get_timedate(&now, s->offset); + s->nvram[0] =3D to_bcd(now.tm_sec); + s->nvram[1] =3D to_bcd(now.tm_min); + if (s->nvram[0xf] & CTRL2_24) { + s->nvram[2] =3D to_bcd(now.tm_hour); + } else { + int tmp =3D now.tm_hour; + if (tmp % 12 =3D=3D 0) { + tmp +=3D 12; + } + if (tmp <=3D 12) { + s->nvram[2] =3D to_bcd(tmp); + } else { + s->nvram[2] =3D HOURS_PM | to_bcd(tmp - 12); + } + } + s->nvram[3] =3D (now.tm_wday + s->wday_offset) % 7 + 1; + s->nvram[4] =3D to_bcd(now.tm_mday); + s->nvram[5] =3D to_bcd(now.tm_mon + 1); + s->nvram[6] =3D to_bcd(now.tm_year - 100); +} + +static void inc_regptr(RS5C372State *s) +{ + s->ptr =3D (s->ptr + 1) & (NVRAM_SIZE - 1); +} + +static int rs5c372_event(I2CSlave *i2c, enum i2c_event event) +{ + RS5C372State *s =3D RS5C372(i2c); + + switch (event) { + case I2C_START_RECV: + /* + * In h/w, capture happens on any START condition, not just a + * START_RECV, but there is no need to actually capture on + * START_SEND, because the guest can't get at that data + * without going through a START_RECV which would overwrite it. + */ + capture_current_time(s); + s->ptr =3D 0xf; + break; + case I2C_START_SEND: + s->addr_byte =3D true; + break; + default: + break; + } + + return 0; +} + +static uint8_t rs5c372_recv(I2CSlave *i2c) +{ + RS5C372State *s =3D RS5C372(i2c); + uint8_t res; + + res =3D s->nvram[s->ptr]; + + trace_rs5c372_recv(s->ptr, res); + + inc_regptr(s); + return res; +} + +static int rs5c372_send(I2CSlave *i2c, uint8_t data) +{ + RS5C372State *s =3D RS5C372(i2c); + + if (s->addr_byte) { + s->ptr =3D data >> 4; + s->tx_format =3D data & 0xf; + s->addr_byte =3D false; + return 0; + } + + trace_rs5c372_send(s->ptr, data); + + if (s->ptr < 7) { + /* Time register. */ + struct tm now; + qemu_get_timedate(&now, s->offset); + switch (s->ptr) { + case 0: + now.tm_sec =3D from_bcd(data & 0x7f); + break; + case 1: + now.tm_min =3D from_bcd(data & 0x7f); + break; + case 2: + if (s->nvram[0xf] & CTRL2_24) { + now.tm_hour =3D from_bcd(data & 0x3f); + } else { + int tmp =3D from_bcd(data & (HOURS_PM - 1)); + if (data & HOURS_PM) { + tmp +=3D 12; + } + if (tmp % 12 =3D=3D 0) { + tmp -=3D 12; + } + now.tm_hour =3D tmp; + } + break; + case 3: + { + /* + * The day field is supposed to contain a value in the ran= ge + * 1-7. Otherwise behavior is undefined. + */ + int user_wday =3D (data & 7) - 1; + s->wday_offset =3D (user_wday - now.tm_wday + 7) % 7; + } + break; + case 4: + now.tm_mday =3D from_bcd(data & 0x3f); + break; + case 5: + now.tm_mon =3D from_bcd(data & 0x1f) - 1; + break; + case 6: + now.tm_year =3D from_bcd(data) + 100; + break; + } + s->offset =3D qemu_timedate_diff(&now); + } else { + s->nvram[s->ptr] =3D data; + } + inc_regptr(s); + return 0; +} + +static void rs5c372_reset(DeviceState *dev) +{ + RS5C372State *s =3D RS5C372(dev); + + /* The clock is running and synchronized with the host */ + s->offset =3D 0; + s->wday_offset =3D 0; + memset(s->nvram, 0, NVRAM_SIZE); + s->ptr =3D 0; + s->addr_byte =3D false; +} + +static void rs5c372_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc =3D DEVICE_CLASS(klass); + I2CSlaveClass *k =3D I2C_SLAVE_CLASS(klass); + + k->event =3D rs5c372_event; + k->recv =3D rs5c372_recv; + k->send =3D rs5c372_send; + device_class_set_legacy_reset(dc, rs5c372_reset); + dc->vmsd =3D &vmstate_rs5c372; +} + +static const TypeInfo rs5c372_types[] =3D { + { + .name =3D TYPE_RS5C372, + .parent =3D TYPE_I2C_SLAVE, + .instance_size =3D sizeof(RS5C372State), + .class_init =3D rs5c372_class_init, + }, +}; + +DEFINE_TYPES(rs5c372_types) diff --git a/hw/rtc/Kconfig b/hw/rtc/Kconfig index 2fe04ec1d0..315b0e4ecc 100644 --- a/hw/rtc/Kconfig +++ b/hw/rtc/Kconfig @@ -26,3 +26,8 @@ config GOLDFISH_RTC =20 config LS7A_RTC bool + +config RS5C372_RTC + bool + depends on I2C + default y if I2C_DEVICES diff --git a/hw/rtc/meson.build b/hw/rtc/meson.build index 8ecc2d792c..6c87864dc0 100644 --- a/hw/rtc/meson.build +++ b/hw/rtc/meson.build @@ -13,3 +13,4 @@ system_ss.add(when: 'CONFIG_GOLDFISH_RTC', if_true: files= ('goldfish_rtc.c')) system_ss.add(when: 'CONFIG_LS7A_RTC', if_true: files('ls7a_rtc.c')) system_ss.add(when: 'CONFIG_ALLWINNER_H3', if_true: files('allwinner-rtc.c= ')) system_ss.add(when: 'CONFIG_MC146818RTC', if_true: files('mc146818rtc.c')) +system_ss.add(when: 'CONFIG_RS5C372_RTC', if_true: files('rs5c372.c')) diff --git a/hw/rtc/trace-events b/hw/rtc/trace-events index 8012afe102..b9f2852d35 100644 --- a/hw/rtc/trace-events +++ b/hw/rtc/trace-events @@ -35,3 +35,7 @@ m48txx_nvram_mem_write(uint32_t addr, uint32_t value) "me= m write addr:0x%04x val # goldfish_rtc.c goldfish_rtc_read(uint64_t addr, uint64_t value) "addr 0x%02" PRIx64 " val= ue 0x%08" PRIx64 goldfish_rtc_write(uint64_t addr, uint64_t value) "addr 0x%02" PRIx64 " va= lue 0x%08" PRIx64 + +# rs5c372.c +rs5c372_recv(uint32_t addr, uint8_t value) "[0x%" PRIx32 "] -> 0x%02" PRIx8 +rs5c372_send(uint32_t addr, uint8_t value) "[0x%" PRIx32 "] <- 0x%02" PRIx8 --=20 2.48.1