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openwrt/target/linux/starfive/patches-6.6/0065-driver-rtc-Add-StarFive-JH7110-rtc-driver.patch

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starfive: add patches for 6.6 Add updated patches for 6.6. DMA/cache-handling patches have been reworked / backported from upstream. Signed-off-by: Zoltan HERPAI <wigyori@uid0.hu>
2024-09-01 14:06:29 +00:00
From 0f44bd6bec708782f38bba4d03deecf927d1c83d Mon Sep 17 00:00:00 2001
From: "ziv.xu" <ziv.xu@starfivetech.com>
Date: Fri, 9 Jun 2023 15:31:53 +0800
Subject: [PATCH 065/116] driver: rtc: Add StarFive JH7110 rtc driver
Add RTC driver and support for StarFive JH7110 SoC.
Signed-off-by: ziv.xu <ziv.xu@starfivetech.com>
Signed-off-by: Hal Feng <hal.feng@starfivetech.com>
---
drivers/rtc/Kconfig | 8 +
drivers/rtc/Makefile | 1 +
drivers/rtc/rtc-starfive.c | 743 +++++++++++++++++++++++++++++++++++++
3 files changed, 752 insertions(+)
create mode 100644 drivers/rtc/rtc-starfive.c
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -1327,6 +1327,14 @@ config RTC_DRV_NTXEC
embedded controller found in certain e-book readers designed by the
original design manufacturer Netronix.
+config RTC_DRV_STARFIVE
+ tristate "StarFive 32.768k-RTC"
+ depends on ARCH_STARFIVE
+ depends on OF
+ help
+ If you say Y here you will get support for the RTC found on
+ StarFive SOCS.
+
comment "on-CPU RTC drivers"
config RTC_DRV_ASM9260
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -163,6 +163,7 @@ obj-$(CONFIG_RTC_DRV_SH) += rtc-sh.o
obj-$(CONFIG_RTC_DRV_SNVS) += rtc-snvs.o
obj-$(CONFIG_RTC_DRV_SPEAR) += rtc-spear.o
obj-$(CONFIG_RTC_DRV_STARFIRE) += rtc-starfire.o
+obj-$(CONFIG_RTC_DRV_STARFIVE) += rtc-starfive.o
obj-$(CONFIG_RTC_DRV_STK17TA8) += rtc-stk17ta8.o
obj-$(CONFIG_RTC_DRV_ST_LPC) += rtc-st-lpc.o
obj-$(CONFIG_RTC_DRV_STM32) += rtc-stm32.o
--- /dev/null
+++ b/drivers/rtc/rtc-starfive.c
@@ -0,0 +1,743 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * RTC driver for the StarFive JH7110 SoC
+ *
+ * Copyright (C) 2021 StarFive Technology Co., Ltd.
+ */
+
+#include <asm/delay.h>
+#include <linux/bcd.h>
+#include <linux/bitfield.h>
+#include <linux/clk.h>
+#include <linux/reset.h>
+#include <linux/completion.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/iopoll.h>
+#include <linux/platform_device.h>
+#include <linux/rtc.h>
+
+/* Registers */
+#define SFT_RTC_CFG 0x00
+#define SFT_RTC_SW_CAL_VALUE 0x04
+#define SFT_RTC_HW_CAL_CFG 0x08
+#define SFT_RTC_CMP_CFG 0x0C
+#define SFT_RTC_IRQ_EN 0x10
+#define SFT_RTC_IRQ_EVEVT 0x14
+#define SFT_RTC_IRQ_STATUS 0x18
+#define SFT_RTC_CAL_VALUE 0x24
+#define SFT_RTC_CFG_TIME 0x28
+#define SFT_RTC_CFG_DATE 0x2C
+#define SFT_RTC_ACT_TIME 0x34
+#define SFT_RTC_ACT_DATE 0x38
+#define SFT_RTC_TIME 0x3C
+#define SFT_RTC_DATE 0x40
+#define SFT_RTC_TIME_LATCH 0x44
+#define SFT_RTC_DATE_LATCH 0x48
+
+/* RTC_CFG */
+#define RTC_CFG_ENABLE_SHIFT 0 /* RW: RTC Enable. */
+#define RTC_CFG_CAL_EN_HW_SHIFT 1 /* RW: Enable of hardware calibretion. */
+#define RTC_CFG_CAL_SEL_SHIFT 2 /* RW: select the hw/sw calibretion mode.*/
+#define RTC_CFG_HOUR_MODE_SHIFT 3 /* RW: time hour mode. 24h|12h */
+
+/* RTC_SW_CAL_VALUE */
+#define RTC_SW_CAL_VALUE_MASK GENMASK(15, 0)
+#define RTC_SW_CAL_MAX RTC_SW_CAL_VALUE_MASK
+#define RTC_SW_CAL_MIN 0
+#define RTC_TICKS_PER_SEC 32768 /* Number of ticks per second */
+#define RTC_PPB_MULT 1000000000LL /* Multiplier for ppb conversions */
+
+/* RTC_HW_CAL_CFG */
+#define RTC_HW_CAL_REF_SEL_SHIFT 0
+#define RTC_HW_CAL_FRQ_SEL_SHIFT 1
+
+/* IRQ_EN/IRQ_EVEVT/IRQ_STATUS */
+#define RTC_IRQ_CAL_START BIT(0)
+#define RTC_IRQ_CAL_FINISH BIT(1)
+#define RTC_IRQ_CMP BIT(2)
+#define RTC_IRQ_1SEC BIT(3)
+#define RTC_IRQ_ALAEM BIT(4)
+#define RTC_IRQ_EVT_UPDATE_PSE BIT(31) /* WO: Enable of update time&&date, IRQ_EVEVT only */
+#define RTC_IRQ_ALL (RTC_IRQ_CAL_START \
+ | RTC_IRQ_CAL_FINISH \
+ | RTC_IRQ_CMP \
+ | RTC_IRQ_1SEC \
+ | RTC_IRQ_ALAEM)
+
+/* CAL_VALUE */
+#define RTC_CAL_VALUE_MASK GENMASK(15, 0)
+
+/* CFG_TIME/ACT_TIME/RTC_TIME */
+#define TIME_SEC_MASK GENMASK(6, 0)
+#define TIME_MIN_MASK GENMASK(13, 7)
+#define TIME_HOUR_MASK GENMASK(20, 14)
+
+/* CFG_DATE/ACT_DATE/RTC_DATE */
+#define DATE_DAY_MASK GENMASK(5, 0)
+#define DATE_MON_MASK GENMASK(10, 6)
+#define DATE_YEAR_MASK GENMASK(18, 11)
+
+#define INT_TIMEOUT_US 180
+
+enum RTC_HOUR_MODE {
+ RTC_HOUR_MODE_12H = 0,
+ RTC_HOUR_MODE_24H = 1
+};
+
+enum RTC_CAL_MODE {
+ RTC_CAL_MODE_SW = 0,
+ RTC_CAL_MODE_HW = 1
+};
+
+enum RTC_HW_CAL_REF_MODE {
+ RTC_CAL_CLK_REF = 0,
+ RTC_CAL_CLK_MARK = 1
+};
+
+static const unsigned long refclk_list[] = {
+ 1000000,
+ 2000000,
+ 4000000,
+ 5927000,
+ 6000000,
+ 7200000,
+ 8000000,
+ 10250000,
+ 11059200,
+ 12000000,
+ 12288000,
+ 13560000,
+ 16000000,
+ 19200000,
+ 20000000,
+ 22118000,
+ 24000000,
+ 24567000,
+ 25000000,
+ 26000000,
+ 27000000,
+ 30000000,
+ 32000000,
+ 33868800,
+ 36000000,
+ 36860000,
+ 40000000,
+ 44000000,
+ 50000000,
+ 54000000,
+ 28224000,
+ 28000000,
+};
+
+struct sft_rtc {
+ struct rtc_device *rtc_dev;
+ struct completion cal_done;
+ struct completion onesec_done;
+ struct clk *pclk;
+ struct clk *cal_clk;
+ struct reset_control *rst_array;
+ int hw_cal_map;
+ void __iomem *regs;
+ int rtc_irq;
+ int ms_pulse_irq;
+ int one_sec_pulse_irq;
+};
+
+static inline void sft_rtc_set_enabled(struct sft_rtc *srtc, bool enabled)
+{
+ u32 val;
+
+ if (enabled) {
+ val = readl(srtc->regs + SFT_RTC_CFG);
+ val |= BIT(RTC_CFG_ENABLE_SHIFT);
+ writel(val, srtc->regs + SFT_RTC_CFG);
+ } else {
+ val = readl(srtc->regs + SFT_RTC_CFG);
+ val &= ~BIT(RTC_CFG_ENABLE_SHIFT);
+ writel(val, srtc->regs + SFT_RTC_CFG);
+ }
+}
+
+static inline bool sft_rtc_get_enabled(struct sft_rtc *srtc)
+{
+ return !!(readl(srtc->regs + SFT_RTC_CFG) & BIT(RTC_CFG_ENABLE_SHIFT));
+}
+
+static inline void sft_rtc_set_mode(struct sft_rtc *srtc, enum RTC_HOUR_MODE mode)
+{
+ u32 val;
+
+ val = readl(srtc->regs + SFT_RTC_CFG);
+ val |= mode << RTC_CFG_HOUR_MODE_SHIFT;
+ writel(val, srtc->regs + SFT_RTC_CFG);
+}
+
+static inline int sft_rtc_irq_enable(struct sft_rtc *srtc, u32 irq, bool enable)
+{
+ u32 val;
+
+ if (!(irq & RTC_IRQ_ALL))
+ return -EINVAL;
+
+ if (enable) {
+ val = readl(srtc->regs + SFT_RTC_IRQ_EN);
+ val |= irq;
+ writel(val, srtc->regs + SFT_RTC_IRQ_EN);
+ } else {
+ val = readl(srtc->regs + SFT_RTC_IRQ_EN);
+ val &= ~irq;
+ writel(val, srtc->regs + SFT_RTC_IRQ_EN);
+ }
+ return 0;
+}
+
+static inline void
+sft_rtc_set_cal_hw_enable(struct sft_rtc *srtc, bool enable)
+{
+ u32 val;
+
+ if (enable) {
+ val = readl(srtc->regs + SFT_RTC_CFG);
+ val |= BIT(RTC_CFG_CAL_EN_HW_SHIFT);
+ writel(val, srtc->regs + SFT_RTC_CFG);
+ } else {
+ val = readl(srtc->regs + SFT_RTC_CFG);
+ val &= ~BIT(RTC_CFG_CAL_EN_HW_SHIFT);
+ writel(val, srtc->regs + SFT_RTC_CFG);
+ }
+}
+
+static inline void
+sft_rtc_set_cal_mode(struct sft_rtc *srtc, enum RTC_CAL_MODE mode)
+{
+ u32 val;
+
+ val = readl(srtc->regs + SFT_RTC_CFG);
+ val |= mode << RTC_CFG_CAL_SEL_SHIFT;
+ writel(val, srtc->regs + SFT_RTC_CFG);
+}
+
+static int sft_rtc_get_hw_calclk(struct device *dev, unsigned long freq)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(refclk_list); i++)
+ if (refclk_list[i] == freq)
+ return i;
+
+ dev_err(dev, "refclk: %ldHz do not support.\n", freq);
+ return -EINVAL;
+}
+
+static inline void sft_rtc_reg2time(struct rtc_time *tm, u32 reg)
+{
+ tm->tm_hour = bcd2bin(FIELD_GET(TIME_HOUR_MASK, reg));
+ tm->tm_min = bcd2bin(FIELD_GET(TIME_MIN_MASK, reg));
+ tm->tm_sec = bcd2bin(FIELD_GET(TIME_SEC_MASK, reg));
+}
+
+static inline void sft_rtc_reg2date(struct rtc_time *tm, u32 reg)
+{
+ tm->tm_year = bcd2bin(FIELD_GET(DATE_YEAR_MASK, reg)) + 100;
+ tm->tm_mon = bcd2bin(FIELD_GET(DATE_MON_MASK, reg)) - 1;
+ tm->tm_mday = bcd2bin(FIELD_GET(DATE_DAY_MASK, reg));
+}
+
+static inline u32 sft_rtc_time2reg(struct rtc_time *tm)
+{
+ return FIELD_PREP(TIME_HOUR_MASK, bin2bcd(tm->tm_hour)) |
+ FIELD_PREP(TIME_MIN_MASK, bin2bcd(tm->tm_min)) |
+ FIELD_PREP(TIME_SEC_MASK, bin2bcd(tm->tm_sec));
+}
+
+static inline u32 sft_rtc_date2reg(struct rtc_time *tm)
+{
+ return FIELD_PREP(DATE_YEAR_MASK, bin2bcd(tm->tm_year - 100)) |
+ FIELD_PREP(DATE_MON_MASK, bin2bcd(tm->tm_mon + 1)) |
+ FIELD_PREP(DATE_DAY_MASK, bin2bcd(tm->tm_mday));
+}
+
+static inline void sft_rtc_update_pulse(struct sft_rtc *srtc)
+{
+ u32 val;
+
+ val = readl(srtc->regs + SFT_RTC_IRQ_EVEVT);
+ val |= RTC_IRQ_EVT_UPDATE_PSE;
+ writel(val, srtc->regs + SFT_RTC_IRQ_EVEVT);
+}
+
+static irqreturn_t sft_rtc_irq_handler(int irq, void *data)
+{
+ struct sft_rtc *srtc = data;
+ struct timerqueue_node *next;
+ u32 irq_flags = 0;
+ u32 irq_mask = 0;
+ u32 val;
+ int ret = 0;
+
+ val = readl(srtc->regs + SFT_RTC_IRQ_EVEVT);
+ if (val & RTC_IRQ_CAL_START)
+ irq_mask |= RTC_IRQ_CAL_START;
+
+ if (val & RTC_IRQ_CAL_FINISH) {
+ irq_mask |= RTC_IRQ_CAL_FINISH;
+ complete(&srtc->cal_done);
+ }
+
+ if (val & RTC_IRQ_CMP)
+ irq_mask |= RTC_IRQ_CMP;
+
+ if (val & RTC_IRQ_1SEC) {
+ irq_flags |= RTC_PF;
+ irq_mask |= RTC_IRQ_1SEC;
+ complete(&srtc->onesec_done);
+ }
+
+ if (val & RTC_IRQ_ALAEM) {
+ irq_flags |= RTC_AF;
+ irq_mask |= RTC_IRQ_ALAEM;
+
+ next = timerqueue_getnext(&srtc->rtc_dev->timerqueue);
+ if (next == &srtc->rtc_dev->aie_timer.node)
+ dev_info(&srtc->rtc_dev->dev, "alarm expires");
+ }
+
+ writel(irq_mask, srtc->regs + SFT_RTC_IRQ_EVEVT);
+
+ /* Wait interrupt flag clear */
+ ret = readl_poll_timeout_atomic(srtc->regs + SFT_RTC_IRQ_EVEVT, val,
+ (val & irq_mask) == 0, 0, INT_TIMEOUT_US);
+ if (ret)
+ dev_warn(&srtc->rtc_dev->dev, "fail to clear rtc interrupt flag\n");
+
+ if (irq_flags)
+ rtc_update_irq(srtc->rtc_dev, 1, irq_flags | RTC_IRQF);
+
+ return IRQ_HANDLED;
+}
+
+static int sft_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+ struct sft_rtc *srtc = dev_get_drvdata(dev);
+ u32 val;
+ int irq_1sec_state_start, irq_1sec_state_end;
+
+ /* If the RTC is disabled, assume the values are invalid */
+ if (!sft_rtc_get_enabled(srtc))
+ return -EINVAL;
+
+ irq_1sec_state_start =
+ (readl(srtc->regs + SFT_RTC_IRQ_STATUS) & RTC_IRQ_1SEC) == 0 ? 0 : 1;
+
+read_again:
+ val = readl(srtc->regs + SFT_RTC_TIME);
+ sft_rtc_reg2time(tm, val);
+
+ val = readl(srtc->regs + SFT_RTC_DATE);
+ sft_rtc_reg2date(tm, val);
+
+ if (irq_1sec_state_start == 0) {
+ irq_1sec_state_end =
+ (readl(srtc->regs + SFT_RTC_IRQ_STATUS) & RTC_IRQ_1SEC) == 0 ? 0 : 1;
+ if (irq_1sec_state_end == 1) {
+ irq_1sec_state_start = 1;
+ goto read_again;
+ }
+ }
+
+ return 0;
+}
+
+static int sft_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+ struct sft_rtc *srtc = dev_get_drvdata(dev);
+ u32 val;
+ int ret;
+
+ val = sft_rtc_time2reg(tm);
+ writel(val, srtc->regs + SFT_RTC_CFG_TIME);
+
+ val = sft_rtc_date2reg(tm);
+ writel(val, srtc->regs + SFT_RTC_CFG_DATE);
+
+ /* Update pulse */
+ sft_rtc_update_pulse(srtc);
+
+ /* Ensure that data is fully written */
+ ret = wait_for_completion_interruptible_timeout(&srtc->onesec_done,
+ usecs_to_jiffies(120));
+ if (ret) {
+ dev_warn(dev,
+ "rtc wait for completion interruptible timeout.\n");
+ }
+ return 0;
+}
+
+static int sft_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
+{
+ struct sft_rtc *srtc = dev_get_drvdata(dev);
+
+ return sft_rtc_irq_enable(srtc, RTC_IRQ_ALAEM, enabled);
+}
+
+static int sft_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
+{
+ struct sft_rtc *srtc = dev_get_drvdata(dev);
+ u32 val;
+
+ val = readl(srtc->regs + SFT_RTC_ACT_TIME);
+ sft_rtc_reg2time(&alarm->time, val);
+
+ val = readl(srtc->regs + SFT_RTC_ACT_DATE);
+ sft_rtc_reg2date(&alarm->time, val);
+
+ return 0;
+}
+
+static int sft_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
+{
+ struct sft_rtc *srtc = dev_get_drvdata(dev);
+ u32 val;
+
+ sft_rtc_alarm_irq_enable(dev, 0);
+
+ val = sft_rtc_time2reg(&alarm->time);
+ writel(val, srtc->regs + SFT_RTC_ACT_TIME);
+
+ val = sft_rtc_date2reg(&alarm->time);
+ writel(val, srtc->regs + SFT_RTC_ACT_DATE);
+
+ sft_rtc_alarm_irq_enable(dev, alarm->enabled);
+
+ return 0;
+}
+
+static int sft_rtc_get_offset(struct device *dev, long *offset)
+{
+ struct sft_rtc *srtc = dev_get_drvdata(dev);
+ s64 tmp;
+ u32 val;
+
+ val = readl(srtc->regs + SFT_RTC_CAL_VALUE)
+ & RTC_SW_CAL_VALUE_MASK;
+ val += 1;
+ /*
+ * the adjust val range is [0x0000-0xffff],
+ * the default val is 0x7fff (32768-1),mapping offset=0 ;
+ */
+ tmp = (s64)val - RTC_TICKS_PER_SEC;
+ tmp *= RTC_PPB_MULT;
+ tmp = div_s64(tmp, RTC_TICKS_PER_SEC);
+
+ /* Offset value operates in negative way, so swap sign */
+ *offset = -tmp;
+
+ return 0;
+}
+
+static int sft_rtc_set_offset(struct device *dev, long offset)
+{
+ struct sft_rtc *srtc = dev_get_drvdata(dev);
+ s64 tmp;
+ u32 val;
+
+ tmp = offset * RTC_TICKS_PER_SEC;
+ tmp = div_s64(tmp, RTC_PPB_MULT);
+
+ tmp = RTC_TICKS_PER_SEC - tmp;
+ tmp -= 1;
+ if (tmp > RTC_SW_CAL_MAX || tmp < RTC_SW_CAL_MIN) {
+ dev_err(dev, "offset is out of range.\n");
+ return -EINVAL;
+ }
+
+ val = tmp & RTC_SW_CAL_VALUE_MASK;
+ /* set software calibration value */
+ writel(val, srtc->regs + SFT_RTC_SW_CAL_VALUE);
+
+ /* set CFG_RTC-cal_sel to select calibretion by software. */
+ sft_rtc_set_cal_mode(srtc, RTC_CAL_MODE_SW);
+
+ return 0;
+}
+
+static __maybe_unused int
+sft_rtc_hw_adjustment(struct device *dev, unsigned int enable)
+{
+ struct sft_rtc *srtc = dev_get_drvdata(dev);
+ u32 val;
+
+ if (srtc->hw_cal_map <= 0) {
+ dev_err(dev, "fail to get cal-clock-freq.\n");
+ return -EFAULT;
+ }
+
+ if (enable) {
+ sft_rtc_irq_enable(srtc, RTC_IRQ_CAL_FINISH, true);
+
+ /* Set reference clock frequency value */
+ val = readl(srtc->regs + SFT_RTC_HW_CAL_CFG);
+ val |= (srtc->hw_cal_map << RTC_HW_CAL_FRQ_SEL_SHIFT);
+ writel(val, srtc->regs + SFT_RTC_HW_CAL_CFG);
+
+ /* Set CFG_RTC-cal_sel to select calibretion by hardware. */
+ sft_rtc_set_cal_mode(srtc, RTC_CAL_MODE_HW);
+
+ /* Set CFG_RTC-cal_en_hw to launch hardware calibretion.*/
+ sft_rtc_set_cal_hw_enable(srtc, true);
+
+ wait_for_completion_interruptible_timeout(&srtc->cal_done,
+ usecs_to_jiffies(100));
+
+ sft_rtc_irq_enable(srtc, RTC_IRQ_CAL_FINISH, false);
+ } else {
+ sft_rtc_set_cal_mode(srtc, RTC_CAL_MODE_SW);
+ sft_rtc_set_cal_hw_enable(srtc, false);
+ }
+
+ return 0;
+}
+
+static int sft_rtc_get_cal_clk(struct device *dev, struct sft_rtc *srtc)
+{
+ struct device_node *np = dev->of_node;
+ unsigned long cal_clk_freq;
+ u32 freq;
+ int ret;
+
+ srtc->cal_clk = devm_clk_get(dev, "cal_clk");
+ if (IS_ERR(srtc->cal_clk))
+ return PTR_ERR(srtc->cal_clk);
+
+ clk_prepare_enable(srtc->cal_clk);
+
+ cal_clk_freq = clk_get_rate(srtc->cal_clk);
+ if (!cal_clk_freq) {
+ dev_warn(dev,
+ "get rate failed, next try to get from dts.\n");
+ ret = of_property_read_u32(np, "rtc,cal-clock-freq", &freq);
+ if (!ret) {
+ cal_clk_freq = (u64)freq;
+ } else {
+ dev_err(dev,
+ "Need rtc,cal-clock-freq define in dts.\n");
+ goto err_disable_cal_clk;
+ }
+ }
+
+ srtc->hw_cal_map = sft_rtc_get_hw_calclk(dev, cal_clk_freq);
+ if (srtc->hw_cal_map < 0) {
+ ret = srtc->hw_cal_map;
+ goto err_disable_cal_clk;
+ }
+
+ return 0;
+
+err_disable_cal_clk:
+ clk_disable_unprepare(srtc->cal_clk);
+
+ return ret;
+}
+
+static int sft_rtc_get_irq(struct platform_device *pdev, struct sft_rtc *srtc)
+{
+ int ret;
+
+ srtc->rtc_irq = platform_get_irq_byname(pdev, "rtc");
+ if (srtc->rtc_irq < 0)
+ return -EINVAL;
+
+ ret = devm_request_irq(&pdev->dev, srtc->rtc_irq,
+ sft_rtc_irq_handler, 0,
+ KBUILD_MODNAME, srtc);
+ if (ret)
+ dev_err(&pdev->dev, "Failed to request interrupt, %d\n", ret);
+
+ return ret;
+}
+
+static const struct rtc_class_ops starfive_rtc_ops = {
+ .read_time = sft_rtc_read_time,
+ .set_time = sft_rtc_set_time,
+ .read_alarm = sft_rtc_read_alarm,
+ .set_alarm = sft_rtc_set_alarm,
+ .alarm_irq_enable = sft_rtc_alarm_irq_enable,
+ .set_offset = sft_rtc_set_offset,
+ .read_offset = sft_rtc_get_offset,
+};
+
+static int sft_rtc_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct sft_rtc *srtc;
+ struct rtc_time tm;
+ struct irq_desc *desc;
+ int ret;
+
+ srtc = devm_kzalloc(dev, sizeof(*srtc), GFP_KERNEL);
+ if (!srtc)
+ return -ENOMEM;
+
+ srtc->regs = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(srtc->regs))
+ return PTR_ERR(srtc->regs);
+
+ srtc->pclk = devm_clk_get(dev, "pclk");
+ if (IS_ERR(srtc->pclk)) {
+ ret = PTR_ERR(srtc->pclk);
+ dev_err(dev,
+ "Failed to retrieve the peripheral clock, %d\n", ret);
+ return ret;
+ }
+
+ srtc->rst_array = devm_reset_control_array_get_exclusive(dev);
+ if (IS_ERR(srtc->rst_array)) {
+ ret = PTR_ERR(srtc->rst_array);
+ dev_err(dev,
+ "Failed to retrieve the rtc reset, %d\n", ret);
+ return ret;
+ }
+
+ init_completion(&srtc->cal_done);
+ init_completion(&srtc->onesec_done);
+
+ ret = clk_prepare_enable(srtc->pclk);
+ if (ret) {
+ dev_err(dev,
+ "Failed to enable the peripheral clock, %d\n", ret);
+ return ret;
+ }
+
+ ret = sft_rtc_get_cal_clk(dev, srtc);
+ if (ret)
+ goto err_disable_pclk;
+
+ ret = reset_control_deassert(srtc->rst_array);
+ if (ret) {
+ dev_err(dev,
+ "Failed to deassert rtc resets, %d\n", ret);
+ goto err_disable_cal_clk;
+ }
+
+ ret = sft_rtc_get_irq(pdev, srtc);
+ if (ret)
+ goto err_disable_cal_clk;
+
+ srtc->rtc_dev = devm_rtc_allocate_device(dev);
+ if (IS_ERR(srtc->rtc_dev))
+ return PTR_ERR(srtc->rtc_dev);
+
+ platform_set_drvdata(pdev, srtc);
+
+ /* The RTC supports 01.01.2001 - 31.12.2099 */
+ srtc->rtc_dev->range_min = mktime64(2001, 1, 1, 0, 0, 0);
+ srtc->rtc_dev->range_max = mktime64(2099, 12, 31, 23, 59, 59);
+
+ srtc->rtc_dev->ops = &starfive_rtc_ops;
+ device_init_wakeup(dev, true);
+
+ desc = irq_to_desc(srtc->rtc_irq);
+ irq_desc_get_chip(desc)->flags = IRQCHIP_SKIP_SET_WAKE;
+
+ /* Always use 24-hour mode and keep the RTC values */
+ sft_rtc_set_mode(srtc, RTC_HOUR_MODE_24H);
+
+ sft_rtc_set_enabled(srtc, true);
+
+ if (device_property_read_bool(dev, "rtc,hw-adjustment"))
+ sft_rtc_hw_adjustment(dev, true);
+
+ /*
+ * If rtc time is out of supported range, reset it to the minimum time.
+ * notice that, actual year = 1900 + tm.tm_year
+ * actual month = 1 + tm.tm_mon
+ */
+ sft_rtc_read_time(dev, &tm);
+ if (tm.tm_year < 101 || tm.tm_year > 199 || tm.tm_mon < 0 || tm.tm_mon > 11 ||
+ tm.tm_mday < 1 || tm.tm_mday > 31 || tm.tm_hour < 0 || tm.tm_hour > 23 ||
+ tm.tm_min < 0 || tm.tm_min > 59 || tm.tm_sec < 0 || tm.tm_sec > 59) {
+ rtc_time64_to_tm(srtc->rtc_dev->range_min, &tm);
+ sft_rtc_set_time(dev, &tm);
+ }
+
+ ret = devm_rtc_register_device(srtc->rtc_dev);
+ if (ret)
+ goto err_disable_wakeup;
+
+ return 0;
+
+err_disable_wakeup:
+ device_init_wakeup(dev, false);
+
+err_disable_cal_clk:
+ clk_disable_unprepare(srtc->cal_clk);
+
+err_disable_pclk:
+ clk_disable_unprepare(srtc->pclk);
+
+ return ret;
+}
+
+static int sft_rtc_remove(struct platform_device *pdev)
+{
+ struct sft_rtc *srtc = platform_get_drvdata(pdev);
+
+ sft_rtc_alarm_irq_enable(&pdev->dev, 0);
+ device_init_wakeup(&pdev->dev, 0);
+
+ clk_disable_unprepare(srtc->pclk);
+ clk_disable_unprepare(srtc->cal_clk);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int sft_rtc_suspend(struct device *dev)
+{
+ struct sft_rtc *srtc = dev_get_drvdata(dev);
+
+ if (device_may_wakeup(dev))
+ enable_irq_wake(srtc->rtc_irq);
+
+ return 0;
+}
+
+static int sft_rtc_resume(struct device *dev)
+{
+ struct sft_rtc *srtc = dev_get_drvdata(dev);
+
+ if (device_may_wakeup(dev))
+ disable_irq_wake(srtc->rtc_irq);
+
+ return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(sft_rtc_pm_ops, sft_rtc_suspend, sft_rtc_resume);
+
+static const struct of_device_id sft_rtc_of_match[] = {
+ { .compatible = "starfive,jh7110-rtc" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, sft_rtc_of_match);
+
+static struct platform_driver starfive_rtc_driver = {
+ .driver = {
+ .name = "starfive-rtc",
+ .of_match_table = sft_rtc_of_match,
+ .pm = &sft_rtc_pm_ops,
+ },
+ .probe = sft_rtc_probe,
+ .remove = sft_rtc_remove,
+};
+module_platform_driver(starfive_rtc_driver);
+
+MODULE_AUTHOR("Samin Guo <samin.guo@starfivetech.com>");
+MODULE_AUTHOR("Hal Feng <hal.feng@starfivetech.com>");
+MODULE_DESCRIPTION("StarFive RTC driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:starfive-rtc");
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