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RTC tracks clock time during system suspend. It can be a wakeup source for the S32G2/S32G3 SoC based boards. The RTC module from S32G2/S32G3 is not battery-powered and it is not kept alive during system reset. Co-developed-by: Bogdan Hamciuc Signed-off-by: Bogdan Hamciuc Co-developed-by: Ghennadi Procopciuc Signed-off-by: Ghennadi Procopciuc Signed-off-by: Ciprian Marian Costea --- drivers/rtc/Kconfig | 11 + drivers/rtc/Makefile | 1 + drivers/rtc/rtc-s32g.c | 554 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 566 insertions(+) create mode 100644 drivers/rtc/rtc-s32g.c diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index e87c3d74565c..18fc3577f6cd 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -2054,4 +2054,15 @@ config RTC_DRV_SSD202D This driver can also be built as a module, if so, the module will be called "rtc-ssd20xd". +config RTC_DRV_S32G + tristate "RTC driver for S32G2/S32G3 SoCs" + depends on ARCH_S32 || COMPILE_TEST + depends on COMMON_CLK + help + Say yes to enable RTC driver for platforms based on the + S32G2/S32G3 SoC family. + + This RTC module can be used as a wakeup source. + Please note that it is not battery-powered. + endif # RTC_CLASS diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index 8ee79cb18322..a63d010a753c 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -158,6 +158,7 @@ obj-$(CONFIG_RTC_DRV_RX8025) += rtc-rx8025.o obj-$(CONFIG_RTC_DRV_RX8111) += rtc-rx8111.o obj-$(CONFIG_RTC_DRV_RX8581) += rtc-rx8581.o obj-$(CONFIG_RTC_DRV_RZN1) += rtc-rzn1.o +obj-$(CONFIG_RTC_DRV_S32G) += rtc-s32g.o obj-$(CONFIG_RTC_DRV_S35390A) += rtc-s35390a.o obj-$(CONFIG_RTC_DRV_S3C) += rtc-s3c.o obj-$(CONFIG_RTC_DRV_S5M) += rtc-s5m.o diff --git a/drivers/rtc/rtc-s32g.c b/drivers/rtc/rtc-s32g.c new file mode 100644 index 000000000000..ad78423783da --- /dev/null +++ b/drivers/rtc/rtc-s32g.c @@ -0,0 +1,554 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright 2024 NXP + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#define RTCC_OFFSET 0x4ul +#define RTCS_OFFSET 0x8ul +#define RTCCNT_OFFSET 0xCul +#define APIVAL_OFFSET 0x10ul +#define RTCVAL_OFFSET 0x14ul + +/* RTCC fields */ +#define RTCC_CNTEN BIT(31) +#define RTCC_RTCIE_SHIFT 30 +#define RTCC_RTCIE BIT(RTCC_RTCIE_SHIFT) +#define RTCC_APIEN BIT(15) +#define RTCC_APIIE BIT(14) +#define RTCC_CLKSEL_OFFSET 12 +#define RTCC_CLKSEL_MASK GENMASK(13, 12) +#define RTCC_CLKSEL(n) (((n) << 12) & RTCC_CLKSEL_MASK) +#define RTCC_DIV512EN BIT(11) +#define RTCC_DIV32EN BIT(10) + +/* RTCS fields */ +#define RTCS_RTCF BIT(29) +#define RTCS_INV_RTC BIT(18) +#define RTCS_APIF BIT(13) + +#define RTCCNT_MAX_VAL GENMASK(31, 0) +#define RTC_SYNCH_TIMEOUT (100 * USEC_PER_MSEC) + +#define RTC_CLK_MUX_SIZE 4 + +/* + * S32G2 and S32G3 SoCs have RTC clock source 1 reserved and + * should not be used. + */ +#define RTC_QUIRK_SRC1_RESERVED BIT(2) + +enum { + RTC_CLK_SRC0, + RTC_CLK_SRC1, + RTC_CLK_SRC2, + RTC_CLK_SRC3 +}; + +enum { + DIV1 = 1, + DIV32 = 32, + DIV512 = 512, + DIV512_32 = 16384 +}; + +static const char *rtc_clk_src[RTC_CLK_MUX_SIZE] = { + "source0", + "source1", + "source2", + "source3" +}; + +struct rtc_time_base { + s64 sec; + u64 cycles; + struct rtc_time tm; +}; + +struct rtc_priv { + struct rtc_device *rdev; + void __iomem *rtc_base; + struct clk *ipg; + struct clk *clk_src; + const struct rtc_soc_data *rtc_data; + struct rtc_time_base base; + u64 rtc_hz; + int dt_irq_id; + int clk_src_idx; +}; + +struct rtc_soc_data { + u32 clk_div; + u32 quirks; +}; + +static const struct rtc_soc_data rtc_s32g2_data = { + .clk_div = DIV512, + .quirks = RTC_QUIRK_SRC1_RESERVED, +}; + +static int is_src1_reserved(struct rtc_priv *priv) +{ + return priv->rtc_data->quirks & RTC_QUIRK_SRC1_RESERVED; +} + +static u64 cycles_to_sec(u64 hz, u64 cycles) +{ + return div_u64(cycles, hz); +} + +/** + * Convert a number of seconds to a value suitable for RTCVAL in our clock's + * current configuration. + * @rtcval: The value to go into RTCVAL[RTCVAL] + * Returns: 0 for success, -EINVAL if @seconds push the counter past the + * 32bit register range + */ +static int sec_to_rtcval(const struct rtc_priv *priv, + unsigned long seconds, u32 *rtcval) +{ + u32 delta_cnt; + + if (!seconds || seconds > cycles_to_sec(priv->rtc_hz, RTCCNT_MAX_VAL)) + return -EINVAL; + + /* + * RTCCNT is read-only; we must return a value relative to the + * current value of the counter (and hope we don't linger around + * too much before we get to enable the interrupt) + */ + delta_cnt = seconds * priv->rtc_hz; + *rtcval = delta_cnt + ioread32(priv->rtc_base + RTCCNT_OFFSET); + + return 0; +} + +static irqreturn_t s32g_rtc_handler(int irq, void *dev) +{ + struct rtc_priv *priv = platform_get_drvdata(dev); + u32 status; + + status = ioread32(priv->rtc_base + RTCS_OFFSET); + + if (status & RTCS_RTCF) { + iowrite32(0x0, priv->rtc_base + RTCVAL_OFFSET); + rtc_update_irq(priv->rdev, 1, RTC_AF); + } + + if (status & RTCS_APIF) + rtc_update_irq(priv->rdev, 1, RTC_PF); + + iowrite32(status, priv->rtc_base + RTCS_OFFSET); + + return IRQ_HANDLED; +} + +static s64 s32g_rtc_get_time_or_alrm(struct rtc_priv *priv, + u32 offset) +{ + u32 counter; + + counter = ioread32(priv->rtc_base + offset); + + if (counter < priv->base.cycles) + return -EINVAL; + + counter -= priv->base.cycles; + + return priv->base.sec + cycles_to_sec(priv->rtc_hz, counter); +} + +static int s32g_rtc_read_time(struct device *dev, + struct rtc_time *tm) +{ + struct rtc_priv *priv = dev_get_drvdata(dev); + s64 sec; + + sec = s32g_rtc_get_time_or_alrm(priv, RTCCNT_OFFSET); + if (sec < 0) + return -EINVAL; + + rtc_time64_to_tm(sec, tm); + + return 0; +} + +static int s32g_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) +{ + struct rtc_priv *priv = dev_get_drvdata(dev); + u32 rtcc, rtccnt, rtcval; + s64 sec; + + sec = s32g_rtc_get_time_or_alrm(priv, RTCVAL_OFFSET); + if (sec < 0) + return -EINVAL; + + rtc_time64_to_tm(sec, &alrm->time); + + rtcc = ioread32(priv->rtc_base + RTCC_OFFSET); + alrm->enabled = sec && (rtcc & RTCC_RTCIE); + + alrm->pending = 0; + if (alrm->enabled) { + rtccnt = ioread32(priv->rtc_base + RTCCNT_OFFSET); + rtcval = ioread32(priv->rtc_base + RTCVAL_OFFSET); + + if (rtccnt < rtcval) + alrm->pending = 1; + } + + return 0; +} + +static int s32g_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) +{ + struct rtc_priv *priv = dev_get_drvdata(dev); + u32 rtcc; + + if (!priv->dt_irq_id) + return -EIO; + + rtcc = ioread32(priv->rtc_base + RTCC_OFFSET); + if (enabled) + rtcc |= RTCC_RTCIE; + + iowrite32(rtcc, priv->rtc_base + RTCC_OFFSET); + + return 0; +} + +static int s32g_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) +{ + struct rtc_priv *priv = dev_get_drvdata(dev); + struct rtc_time time_crt; + long long t_crt, t_alrm; + u32 rtcval, rtcs; + int ret = 0; + + iowrite32(0x0, priv->rtc_base + RTCVAL_OFFSET); + + t_alrm = rtc_tm_to_time64(&alrm->time); + + /* + * Assuming the alarm is being set relative to the same time + * returned by our s32g_rtc_read_time callback + */ + ret = s32g_rtc_read_time(dev, &time_crt); + if (ret) + return ret; + + t_crt = rtc_tm_to_time64(&time_crt); + ret = sec_to_rtcval(priv, t_alrm - t_crt, &rtcval); + if (ret) { + dev_warn(dev, "Alarm is set too far in the future\n"); + return -ERANGE; + } + + ret = read_poll_timeout(ioread32, rtcs, !(rtcs & RTCS_INV_RTC), + 0, RTC_SYNCH_TIMEOUT, false, priv->rtc_base + RTCS_OFFSET); + if (ret) + return ret; + + iowrite32(rtcval, priv->rtc_base + RTCVAL_OFFSET); + + return 0; +} + +static int s32g_rtc_set_time(struct device *dev, + struct rtc_time *time) +{ + struct rtc_priv *priv = dev_get_drvdata(dev); + + priv->base.cycles = ioread32(priv->rtc_base + RTCCNT_OFFSET); + priv->base.sec = rtc_tm_to_time64(time); + + return 0; +} + +/* + * Disable the 32-bit free running counter. + * This allows Clock Source and Divisors selection + * to be performed without causing synchronization issues. + */ +static void s32g_rtc_disable(struct rtc_priv *priv) +{ + u32 rtcc = ioread32(priv->rtc_base + RTCC_OFFSET); + + rtcc &= ~RTCC_CNTEN; + iowrite32(rtcc, priv->rtc_base + RTCC_OFFSET); +} + +static void s32g_rtc_enable(struct rtc_priv *priv) +{ + u32 rtcc = ioread32(priv->rtc_base + RTCC_OFFSET); + + rtcc |= RTCC_CNTEN; + iowrite32(rtcc, priv->rtc_base + RTCC_OFFSET); +} + +static int rtc_clk_src_setup(struct rtc_priv *priv) +{ + u32 rtcc = 0; + + switch (priv->clk_src_idx) { + case RTC_CLK_SRC0: + rtcc |= RTCC_CLKSEL(RTC_CLK_SRC0); + break; + case RTC_CLK_SRC1: + if (is_src1_reserved(priv)) + return -EOPNOTSUPP; + rtcc |= RTCC_CLKSEL(RTC_CLK_SRC1); + break; + case RTC_CLK_SRC2: + rtcc |= RTCC_CLKSEL(RTC_CLK_SRC2); + break; + case RTC_CLK_SRC3: + rtcc |= RTCC_CLKSEL(RTC_CLK_SRC3); + break; + default: + return -EINVAL; + } + + switch (priv->rtc_data->clk_div) { + case DIV512_32: + rtcc |= RTCC_DIV512EN; + rtcc |= RTCC_DIV32EN; + break; + case DIV512: + rtcc |= RTCC_DIV512EN; + break; + case DIV32: + rtcc |= RTCC_DIV32EN; + break; + case DIV1: + break; + default: + return -EINVAL; + } + + rtcc |= RTCC_RTCIE; + /* + * Make sure the CNTEN is 0 before we configure + * the clock source and dividers. + */ + s32g_rtc_disable(priv); + iowrite32(rtcc, priv->rtc_base + RTCC_OFFSET); + s32g_rtc_enable(priv); + + return 0; +} + +static const struct rtc_class_ops rtc_ops = { + .read_time = s32g_rtc_read_time, + .set_time = s32g_rtc_set_time, + .read_alarm = s32g_rtc_read_alarm, + .set_alarm = s32g_rtc_set_alarm, + .alarm_irq_enable = s32g_rtc_alarm_irq_enable, +}; + +static int rtc_clk_dts_setup(struct rtc_priv *priv, + struct device *dev) +{ + int i; + + priv->ipg = devm_clk_get_enabled(dev, "ipg"); + if (IS_ERR(priv->ipg)) + return dev_err_probe(dev, PTR_ERR(priv->ipg), + "Failed to get 'ipg' clock\n"); + + for (i = 0; i < RTC_CLK_MUX_SIZE; i++) { + priv->clk_src = devm_clk_get_enabled(dev, rtc_clk_src[i]); + if (!IS_ERR(priv->clk_src)) { + priv->clk_src_idx = i; + break; + } + } + + if (IS_ERR(priv->clk_src)) + return dev_err_probe(dev, PTR_ERR(priv->clk_src), + "Failed to get rtc module clock source\n"); + + return 0; +} + +static int s32g_rtc_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct rtc_priv *priv; + int ret = 0; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->rtc_data = of_device_get_match_data(dev); + if (!priv->rtc_data) + return -ENODEV; + + priv->rtc_base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(priv->rtc_base)) + return PTR_ERR(priv->rtc_base); + + device_init_wakeup(dev, true); + + ret = rtc_clk_dts_setup(priv, dev); + if (ret) + return ret; + + priv->rdev = devm_rtc_allocate_device(dev); + if (IS_ERR(priv->rdev)) + return PTR_ERR(priv->rdev); + + ret = rtc_clk_src_setup(priv); + if (ret) + return ret; + + priv->rtc_hz = clk_get_rate(priv->clk_src); + if (!priv->rtc_hz) + return dev_err_probe(dev, -EINVAL, "Failed to get RTC frequency\n"); + + priv->rtc_hz /= priv->rtc_data->clk_div; + + platform_set_drvdata(pdev, priv); + priv->rdev->ops = &rtc_ops; + + priv->dt_irq_id = platform_get_irq(pdev, 0); + if (priv->dt_irq_id < 0) + return priv->dt_irq_id; + + ret = devm_request_irq(dev, priv->dt_irq_id, + s32g_rtc_handler, 0, dev_name(dev), pdev); + if (ret) { + dev_err(dev, "Request interrupt %d failed, error: %d\n", + priv->dt_irq_id, ret); + goto disable_rtc; + } + + ret = devm_rtc_register_device(priv->rdev); + if (ret) + goto disable_rtc; + + return 0; + +disable_rtc: + s32g_rtc_disable(priv); + return ret; +} + +static void enable_api_irq(struct device *dev, unsigned int enabled) +{ + struct rtc_priv *priv = dev_get_drvdata(dev); + u32 api_irq = RTCC_APIEN | RTCC_APIIE; + u32 rtcc; + + rtcc = ioread32(priv->rtc_base + RTCC_OFFSET); + if (enabled) + rtcc |= api_irq; + else + rtcc &= ~api_irq; + iowrite32(rtcc, priv->rtc_base + RTCC_OFFSET); +} + +static int s32g_rtc_suspend(struct device *dev) +{ + struct rtc_priv *init_priv = dev_get_drvdata(dev); + struct rtc_priv priv; + long long base_sec; + u32 rtcval, rtccnt; + int ret = 0; + u32 sec; + + if (!device_may_wakeup(dev)) + return 0; + + /* Save last known timestamp */ + ret = s32g_rtc_read_time(dev, &init_priv->base.tm); + if (ret) + return ret; + + /* + * Use a local copy of the RTC control block to + * avoid restoring it on resume path. + */ + memcpy(&priv, init_priv, sizeof(priv)); + + rtccnt = ioread32(init_priv->rtc_base + RTCCNT_OFFSET); + rtcval = ioread32(init_priv->rtc_base + RTCVAL_OFFSET); + sec = cycles_to_sec(init_priv->rtc_hz, rtcval - rtccnt); + + /* Adjust for the number of seconds we'll be asleep */ + base_sec = rtc_tm_to_time64(&init_priv->base.tm); + base_sec += sec; + rtc_time64_to_tm(base_sec, &init_priv->base.tm); + + /* Reset RTC to prevent overflow. + * RTCCNT (RTC Counter) cannot be individually reset + * since it is RO (read-only). + */ + s32g_rtc_disable(&priv); + s32g_rtc_enable(&priv); + + ret = sec_to_rtcval(&priv, sec, &rtcval); + if (ret) { + dev_warn(dev, "Alarm is too far in the future\n"); + return -ERANGE; + } + + enable_api_irq(dev, 1); + iowrite32(rtcval, priv.rtc_base + APIVAL_OFFSET); + iowrite32(0, priv.rtc_base + RTCVAL_OFFSET); + + return ret; +} + +static int s32g_rtc_resume(struct device *dev) +{ + struct rtc_priv *priv = dev_get_drvdata(dev); + int ret; + + if (!device_may_wakeup(dev)) + return 0; + + /* Disable wake-up interrupts */ + enable_api_irq(dev, 0); + + ret = rtc_clk_src_setup(priv); + if (ret) + return ret; + + /* + * Now RTCCNT has just been reset, and is out of sync with priv->base; + * reapply the saved time settings. + */ + return s32g_rtc_set_time(dev, &priv->base.tm); +} + +static const struct of_device_id rtc_dt_ids[] = { + { .compatible = "nxp,s32g2-rtc", .data = &rtc_s32g2_data}, + { /* sentinel */ }, +}; + +static DEFINE_SIMPLE_DEV_PM_OPS(s32g_rtc_pm_ops, + s32g_rtc_suspend, s32g_rtc_resume); + +static struct platform_driver s32g_rtc_driver = { + .driver = { + .name = "s32g-rtc", + .pm = pm_sleep_ptr(&s32g_rtc_pm_ops), + .of_match_table = rtc_dt_ids, + }, + .probe = s32g_rtc_probe, +}; +module_platform_driver(s32g_rtc_driver); + +MODULE_AUTHOR("NXP"); +MODULE_DESCRIPTION("NXP RTC driver for S32G2/S32G3"); +MODULE_LICENSE("GPL");