// SPDX-License-Identifier: GPL-2.0 /* * RTC driver for the interal RTC block in the Amlogic Meson6, Meson8, * Meson8b and Meson8m2 SoCs. * * The RTC is split in to two parts, the AHB front end and a simple serial * connection to the actual registers. This driver manages both parts. * * Copyright (c) 2018 Martin Blumenstingl <[email protected]> * Copyright (c) 2015 Ben Dooks <[email protected]> for Codethink Ltd * Based on origin by Carlo Caione <[email protected]> */ #include <linux/bitfield.h> #include <linux/delay.h> #include <linux/io.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/nvmem-provider.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/regmap.h> #include <linux/regulator/consumer.h> #include <linux/reset.h> #include <linux/rtc.h> /* registers accessed from cpu bus */ #define RTC_ADDR0 … #define RTC_ADDR0_LINE_SCLK … #define RTC_ADDR0_LINE_SEN … #define RTC_ADDR0_LINE_SDI … #define RTC_ADDR0_START_SER … #define RTC_ADDR0_WAIT_SER … #define RTC_ADDR0_DATA … #define RTC_ADDR1 … #define RTC_ADDR1_SDO … #define RTC_ADDR1_S_READY … #define RTC_ADDR2 … #define RTC_ADDR3 … #define RTC_REG4 … #define RTC_REG4_STATIC_VALUE … /* rtc registers accessed via rtc-serial interface */ #define RTC_COUNTER … #define RTC_SEC_ADJ … #define RTC_REGMEM_0 … #define RTC_REGMEM_1 … #define RTC_REGMEM_2 … #define RTC_REGMEM_3 … #define RTC_ADDR_BITS … #define RTC_DATA_BITS … #define MESON_STATIC_BIAS_CUR … #define MESON_STATIC_VOLTAGE … #define MESON_STATIC_DEFAULT … struct meson_rtc { … }; static const struct regmap_config meson_rtc_peripheral_regmap_config = …; /* RTC front-end serialiser controls */ static void meson_rtc_sclk_pulse(struct meson_rtc *rtc) { … } static void meson_rtc_send_bit(struct meson_rtc *rtc, unsigned int bit) { … } static void meson_rtc_send_bits(struct meson_rtc *rtc, u32 data, unsigned int nr) { … } static void meson_rtc_set_dir(struct meson_rtc *rtc, u32 mode) { … } static u32 meson_rtc_get_data(struct meson_rtc *rtc) { … } static int meson_rtc_get_bus(struct meson_rtc *rtc) { … } static int meson_rtc_serial_bus_reg_read(void *context, unsigned int reg, unsigned int *data) { … } static int meson_rtc_serial_bus_reg_write(void *context, unsigned int reg, unsigned int data) { … } static const struct regmap_bus meson_rtc_serial_bus = …; static const struct regmap_config meson_rtc_serial_regmap_config = …; static int meson_rtc_write_static(struct meson_rtc *rtc, u32 data) { … } /* RTC interface layer functions */ static int meson_rtc_gettime(struct device *dev, struct rtc_time *tm) { … } static int meson_rtc_settime(struct device *dev, struct rtc_time *tm) { … } static const struct rtc_class_ops meson_rtc_ops = …; /* NVMEM interface layer functions */ static int meson_rtc_regmem_read(void *context, unsigned int offset, void *buf, size_t bytes) { … } static int meson_rtc_regmem_write(void *context, unsigned int offset, void *buf, size_t bytes) { … } static int meson_rtc_probe(struct platform_device *pdev) { … } static const __maybe_unused struct of_device_id meson_rtc_dt_match[] = …; MODULE_DEVICE_TABLE(of, meson_rtc_dt_match); static struct platform_driver meson_rtc_driver = …; module_platform_driver(…) …; MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …; MODULE_AUTHOR(…) …; MODULE_LICENSE(…) …; MODULE_ALIAS(…) …;
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