[ck] [PHYTIUM ft2500 v2.0 2/7] PHYTIUM: rtc: Add Phytium rtc device support

Add phytium ft25000 platform rtc driver. Signed-off-by: Xin Hao &lt;xingxin.hx(a)openanolis.org&gt; Reviewed-by: Baolin Wang &lt;baolin.wang(a)openanolis.org&gt; --- drivers/i2c/busses/i2c-designware-platdrv.c | 1 + drivers/rtc/Kconfig | 10 + drivers/rtc/Makefile | 1 + drivers/rtc/rtc-phytium.c | 317 ++++++++++++++++++++ 4 files changed, 329 insertions(+) create mode 100644 drivers/rtc/rtc-phytium.c diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c index b5750fd85125..3818b7a0a847 100644 --- a/drivers/i2c/busses/i2c-designware-platdrv.c +++ b/drivers/i2c/busses/i2c-designware-platdrv.c @@ -151,6 +151,7 @@ static const struct acpi_device_id dw_i2c_acpi_match[] = { { "APMC0D0F", 0 }, { "HISI02A1", 0 }, { "HISI02A2", 0 }, + { "PHYT0003", 0 }, { } }; MODULE_DEVICE_TABLE(acpi, dw_i2c_acpi_match); diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index 7d7be60a2413..3e4effbf31ef 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -1793,6 +1793,16 @@ config RTC_DRV_RTD119X If you say yes here, you get support for the RTD1295 SoC Real Time Clock. +config RTC_DRV_PHYTIUM + tristate "Phytium RTC" + depends on ARCH_PHYTIUM + default y if ARCH_PHYTIUM + help + Say yes here to support the Phytium SoC real time clock. + + This driver can also be built as a module, if so, the module + will be called "rtc-phytium". + comment "HID Sensor RTC drivers" config RTC_DRV_HID_SENSOR_TIME diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index 5ff2fc0c361a..289447233c6b 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -120,6 +120,7 @@ obj-$(CONFIG_RTC_DRV_PCF85363) += rtc-pcf85363.o obj-$(CONFIG_RTC_DRV_PCF8523) += rtc-pcf8523.o obj-$(CONFIG_RTC_DRV_PCF8563) += rtc-pcf8563.o obj-$(CONFIG_RTC_DRV_PCF8583) += rtc-pcf8583.o +obj-$(CONFIG_RTC_DRV_PHYTIUM) += rtc-phytium.o obj-$(CONFIG_RTC_DRV_PIC32) += rtc-pic32.o obj-$(CONFIG_RTC_DRV_PL030) += rtc-pl030.o obj-$(CONFIG_RTC_DRV_PL031) += rtc-pl031.o diff --git a/drivers/rtc/rtc-phytium.c b/drivers/rtc/rtc-phytium.c new file mode 100644 index 000000000000..dff96edd07d6 --- /dev/null +++ b/drivers/rtc/rtc-phytium.c @@ -0,0 +1,317 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Phytium Real Time Clock Driver + * + * Copyright (c) 2019, Phytium Technology Co., Ltd. + * + * Chen Baozi &lt;chenbaozi(a)phytium.com.cn&gt; + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/io.h> +#include <linux/clk.h> +#include <linux/rtc.h> +#include <linux/acpi.h> + +#define RTC_CMR 0x04 +#define RTC_AES_SEL 0x08 +#define RTC_AES_SEL_COUNTER 0x100 +#define RTC_CCR 0x0C +#define RTC_CCR_IE BIT(0) +#define RTC_CCR_MASK BIT(1) +#define RTC_CCR_EN BIT(2) +#define RTC_CCR_WEN BIT(3) +#define RTC_STAT 0x10 +#define RTC_STAT_BIT BIT(0) +#define RTC_RSTAT 0x14 +#define RTC_EOI 0x18 +#define RTC_VER 0x1C +#define RTC_CDR_LOW 0x20 +#define RTC_CCVR 0x24 +#define RTC_CLR_LOW 0x28 +#define RTC_CLR 0x2c +#define RTC_COUNTER_HB_OFFSET 15 +#define RTC_COUNTER_LB_MASK GENMASK(14, 0) + +struct phytium_rtc_dev { + struct rtc_device *rtc; + struct device *dev; + unsigned long alarm_time; + void __iomem *csr_base; + struct clk *clk; + unsigned int irq_wake; + unsigned int irq_enabled; +}; + +static int phytium_rtc_read_time(struct device *dev, struct rtc_time *tm) +{ + struct phytium_rtc_dev *pdata = dev_get_drvdata(dev); + + unsigned long counter; + unsigned long tmp; + + writel(RTC_AES_SEL_COUNTER, pdata->csr_base + RTC_AES_SEL); + counter = readl(pdata->csr_base + RTC_CCVR); + tmp = readl(pdata->csr_base + RTC_CDR_LOW); + + rtc_time_to_tm(counter, tm); + return rtc_valid_tm(tm); +} + +static int phytium_rtc_set_mmss(struct device *dev, unsigned long secs) +{ + struct phytium_rtc_dev *pdata = dev_get_drvdata(dev); + unsigned long counter; + unsigned long tmp; + + writel(RTC_AES_SEL_COUNTER, pdata->csr_base + RTC_AES_SEL); + writel(0x00000000, pdata->csr_base + RTC_CLR_LOW); + writel((u32)secs, pdata->csr_base + RTC_CLR); + writel(RTC_AES_SEL_COUNTER, pdata->csr_base + RTC_AES_SEL); + counter = readl(pdata->csr_base + RTC_CLR); + tmp = readl(pdata->csr_base + RTC_CLR_LOW); + + return 0; +} + +static int phytium_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) +{ + struct phytium_rtc_dev *pdata = dev_get_drvdata(dev); + + rtc_time_to_tm(pdata->alarm_time, &alrm->time); + alrm->enabled = readl(pdata->csr_base + RTC_CCR) & RTC_CCR_IE; + + return 0; +} + +static int phytium_rtc_alarm_irq_enable(struct device *dev, u32 enabled) +{ + struct phytium_rtc_dev *pdata = dev_get_drvdata(dev); + u32 ccr; + + ccr = readl(pdata->csr_base + RTC_CCR); + if (enabled) { + ccr &= ~RTC_CCR_MASK; + ccr |= RTC_CCR_IE; + } else { + ccr &= ~RTC_CCR_IE; + ccr |= RTC_CCR_MASK; + } + writel(ccr, pdata->csr_base + RTC_CCR); + + return 0; +} + +static int phytium_rtc_alarm_irq_enabled(struct device *dev) +{ + struct phytium_rtc_dev *pdata = dev_get_drvdata(dev); + + return readl(pdata->csr_base + RTC_CCR) & RTC_CCR_IE ? 1 : 0; +} + +static int phytium_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) +{ + struct phytium_rtc_dev *pdata = dev_get_drvdata(dev); + unsigned long alarm_time; + + rtc_tm_to_time(&alrm->time, &alarm_time); + + pdata->alarm_time = alarm_time; + writel((u32) pdata->alarm_time, pdata->csr_base + RTC_CMR); + + phytium_rtc_alarm_irq_enable(dev, alrm->enabled); + + return 0; +} + +static const struct rtc_class_ops phytium_rtc_ops = { + .read_time = phytium_rtc_read_time, + .set_mmss = phytium_rtc_set_mmss, + .read_alarm = phytium_rtc_read_alarm, + .set_alarm = phytium_rtc_set_alarm, + .alarm_irq_enable = phytium_rtc_alarm_irq_enable, +}; + +static irqreturn_t phytium_rtc_interrupt(int irq, void *id) +{ + struct phytium_rtc_dev *pdata = (struct phytium_rtc_dev *) id; + + /* Check if interrupt asserted */ + if (!(readl(pdata->csr_base + RTC_STAT) & RTC_STAT_BIT)) + return IRQ_NONE; + + /* Clear interrupt */ + readl(pdata->csr_base + RTC_EOI); + + rtc_update_irq(pdata->rtc, 1, RTC_IRQF | RTC_AF); + + return IRQ_HANDLED; +} + +static int phytium_rtc_probe(struct platform_device *pdev) +{ + struct phytium_rtc_dev *pdata; + struct resource *res; + int ret; + int irq; + + pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) + return -ENOMEM; + platform_set_drvdata(pdev, pdata); + pdata->dev = &pdev->dev; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + pdata->csr_base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(pdata->csr_base)) + return PTR_ERR(pdata->csr_base); + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + dev_err(&pdev->dev, "No IRQ resource\n"); + return irq; + } + ret = devm_request_irq(&pdev->dev, irq, phytium_rtc_interrupt, 0, + dev_name(&pdev->dev), pdata); + if (ret) { + dev_err(&pdev->dev, "Could not request IRQ\n"); + return ret; + } + +#ifndef CONFIG_ACPI + pdata->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(pdata->clk)) { + dev_err(&pdev->dev, "Couldn't get the clock for RTC\n"); + return -ENODEV; + } + + ret = clk_prepare_enable(pdata->clk); + if (ret) + return ret; +#endif + + /* Turn on the clock and the crystal */ + writel(RTC_CCR_EN, pdata->csr_base + RTC_CCR); + + ret = device_init_wakeup(&pdev->dev, 1); + if (ret) { + clk_disable_unprepare(pdata->clk); + return ret; + } + + pdata->rtc = devm_rtc_device_register(&pdev->dev, pdev->name, + &phytium_rtc_ops, THIS_MODULE); + if (IS_ERR(pdata->rtc)) { + clk_disable_unprepare(pdata->clk); + return PTR_ERR(pdata->rtc); + } + + /* HW does not support update faster than 1 seconds */ + pdata->rtc->uie_unsupported = 1; + + return 0; +} + +static int phytium_rtc_remove(struct platform_device *pdev) +{ + struct phytium_rtc_dev *pdata = platform_get_drvdata(pdev); + + phytium_rtc_alarm_irq_enable(&pdev->dev, 0); + device_init_wakeup(&pdev->dev, 0); + clk_disable_unprepare(pdata->clk); + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int phytium_rtc_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct phytium_rtc_dev *pdata = platform_get_drvdata(pdev); + int irq; + + /* + * If this RTC alarm will be used for waking the system up, + * don't disable it of course. Else we just disable the alarm + * and await suspension. + */ + irq = platform_get_irq(pdev, 0); + if (device_may_wakeup(&pdev->dev)) { + if (!enable_irq_wake(irq)) + pdata->irq_wake = 1; + } else { + pdata->irq_enabled = phytium_rtc_alarm_irq_enabled(dev); + phytium_rtc_alarm_irq_enable(dev, 0); + clk_disable_unprepare(pdata->clk); + } + + return 0; +} + +static int phytium_rtc_resume(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct phytium_rtc_dev *pdata = platform_get_drvdata(pdev); + int irq; + int rc; + + irq = platform_get_irq(pdev, 0); + if (device_may_wakeup(&pdev->dev)) { + if (pdata->irq_wake) { + disable_irq_wake(irq); + pdata->irq_wake = 0; + } + } else { + rc = clk_prepare_enable(pdata->clk); + if (rc) { + dev_err(dev, "Unable to enable clock error %d\n", rc); + return rc; + } + phytium_rtc_alarm_irq_enable(dev, pdata->irq_enabled); + } + + return 0; +} +#endif + +static SIMPLE_DEV_PM_OPS(phytium_rtc_pm_ops, phytium_rtc_suspend, phytium_rtc_resume); + +#ifdef CONFIG_OF +static const struct of_device_id phytium_rtc_of_match[] = { + { .compatible = "phytium,rtc" }, + { } +}; +MODULE_DEVICE_TABLE(of, phytium_rtc_of_match); +#endif + +#ifdef CONFIG_ACPI +static const struct acpi_device_id phytium_rtc_acpi_match[] = { + { "PHYT0002", 0 }, + { } +}; +#endif + +static struct platform_driver phytium_rtc_driver = { + .probe = phytium_rtc_probe, + .remove = phytium_rtc_remove, + .driver = { + .name = "phytium-rtc", + .pm = &phytium_rtc_pm_ops, + .of_match_table = of_match_ptr(phytium_rtc_of_match), + .acpi_match_table = ACPI_PTR(phytium_rtc_acpi_match), + }, +}; + +module_platform_driver(phytium_rtc_driver); + +MODULE_DESCRIPTION("Phytium RTC driver"); +MODULE_AUTHOR("Chen Baozi &lt;chenbaozi(a)phytium.com.cn&gt;&quot;)>"); +MODULE_LICENSE("GPL"); -- 2.31.0