rtc: remove ste coh901 driver (dd2d3b40) · Commits · EulixOS / Software / Kernel

Documentation/devicetree/bindings/rtc/stericsson,coh901331.txt

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		ST-Ericsson COH 901 331 Real Time Clock

		Required properties:
		- compatible: must be "stericsson,coh901331"
		- reg: address range of rtc register set.
		- interrupts: rtc alarm interrupt.
		- clocks: phandle to the rtc clock source

		Example:
		rtc: rtc@c0017000 {
		compatible = "stericsson,coh901331";
		reg = <0xc0017000 0x1000>;
		interrupt-parent = <&vicb>;
		interrupts = <10>;
		clocks = <&rtc_clk>;
		};

drivers/rtc/Kconfig

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		@@ -1639,18 +1639,6 @@ config RTC_DRV_PS3
		This driver can also be built as a module. If so, the module
		will be called rtc-ps3.

		config RTC_DRV_COH901331
		tristate "ST-Ericsson COH 901 331 RTC"
		depends on ARCH_U300 \|\| COMPILE_TEST
		help
		If you say Y here you will get access to ST-Ericsson
		COH 901 331 RTC clock found in some ST-Ericsson Mobile
		Platforms.

		This driver can also be built as a module. If so, the module
		will be called "rtc-coh901331".


		config RTC_DRV_STMP
		tristate "Freescale STMP3xxx/i.MX23/i.MX28 RTC"
		depends on ARCH_MXS \|\| COMPILE_TEST

drivers/rtc/Makefile

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		@@ -38,7 +38,6 @@ obj-$(CONFIG_RTC_DRV_BQ4802) += rtc-bq4802.o
		obj-$(CONFIG_RTC_DRV_BRCMSTB) += rtc-brcmstb-waketimer.o
		obj-$(CONFIG_RTC_DRV_CADENCE) += rtc-cadence.o
		obj-$(CONFIG_RTC_DRV_CMOS) += rtc-cmos.o
		obj-$(CONFIG_RTC_DRV_COH901331) += rtc-coh901331.o
		obj-$(CONFIG_RTC_DRV_CPCAP) += rtc-cpcap.o
		obj-$(CONFIG_RTC_DRV_CROS_EC) += rtc-cros-ec.o
		obj-$(CONFIG_RTC_DRV_DA9052) += rtc-da9052.o

drivers/rtc/rtc-coh901331.c

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		// SPDX-License-Identifier: GPL-2.0
		/*
		* Copyright (C) 2007-2009 ST-Ericsson AB
		* Real Time Clock interface for ST-Ericsson AB COH 901 331 RTC.
		* Author: Linus Walleij <linus.walleij@stericsson.com>
		* Based on rtc-pl031.c by Deepak Saxena <dsaxena@plexity.net>
		* Copyright 2006 (c) MontaVista Software, Inc.
		*/
		#include <linux/init.h>
		#include <linux/module.h>
		#include <linux/mod_devicetable.h>
		#include <linux/rtc.h>
		#include <linux/clk.h>
		#include <linux/interrupt.h>
		#include <linux/pm.h>
		#include <linux/platform_device.h>
		#include <linux/io.h>
		#include <linux/slab.h>

		/*
		* Registers in the COH 901 331
		*/
		/* Alarm value 32bit (R/W) */
		#define COH901331_ALARM 0x00U
		/* Used to set current time 32bit (R/W) */
		#define COH901331_SET_TIME 0x04U
		/* Indication if current time is valid 32bit (R/-) */
		#define COH901331_VALID 0x08U
		/* Read the current time 32bit (R/-) */
		#define COH901331_CUR_TIME 0x0cU
		/* Event register for the "alarm" interrupt */
		#define COH901331_IRQ_EVENT 0x10U
		/* Mask register for the "alarm" interrupt */
		#define COH901331_IRQ_MASK 0x14U
		/* Force register for the "alarm" interrupt */
		#define COH901331_IRQ_FORCE 0x18U

		/*
		* Reference to RTC block clock
		* Notice that the frequent clk_enable()/clk_disable() on this
		* clock is mainly to be able to turn on/off other clocks in the
		* hierarchy as needed, the RTC clock is always on anyway.
		*/
		struct coh901331_port {
		struct rtc_device *rtc;
		struct clk *clk;
		void __iomem *virtbase;
		int irq;
		#ifdef CONFIG_PM_SLEEP
		u32 irqmaskstore;
		#endif
		};

		static irqreturn_t coh901331_interrupt(int irq, void *data)
		{
		struct coh901331_port *rtap = data;

		clk_enable(rtap->clk);
		/* Ack IRQ */
		writel(1, rtap->virtbase + COH901331_IRQ_EVENT);
		/*
		* Disable the interrupt. This is necessary because
		* the RTC lives on a lower-clocked line and will
		* not release the IRQ line until after a few (slower)
		* clock cycles. The interrupt will be re-enabled when
		* a new alarm is set anyway.
		*/
		writel(0, rtap->virtbase + COH901331_IRQ_MASK);
		clk_disable(rtap->clk);

		/* Set alarm flag */
		rtc_update_irq(rtap->rtc, 1, RTC_AF);

		return IRQ_HANDLED;
		}

		static int coh901331_read_time(struct device dev, struct rtc_time tm)
		{
		struct coh901331_port *rtap = dev_get_drvdata(dev);

		clk_enable(rtap->clk);
		/* Check if the time is valid */
		if (!readl(rtap->virtbase + COH901331_VALID)) {
		clk_disable(rtap->clk);
		return -EINVAL;
		}

		rtc_time64_to_tm(readl(rtap->virtbase + COH901331_CUR_TIME), tm);
		clk_disable(rtap->clk);
		return 0;
		}

		static int coh901331_set_time(struct device dev, struct rtc_time tm)
		{
		struct coh901331_port *rtap = dev_get_drvdata(dev);

		clk_enable(rtap->clk);
		writel(rtc_tm_to_time64(tm), rtap->virtbase + COH901331_SET_TIME);
		clk_disable(rtap->clk);

		return 0;
		}

		static int coh901331_read_alarm(struct device dev, struct rtc_wkalrm alarm)
		{
		struct coh901331_port *rtap = dev_get_drvdata(dev);

		clk_enable(rtap->clk);
		rtc_time64_to_tm(readl(rtap->virtbase + COH901331_ALARM), &alarm->time);
		alarm->pending = readl(rtap->virtbase + COH901331_IRQ_EVENT) & 1U;
		alarm->enabled = readl(rtap->virtbase + COH901331_IRQ_MASK) & 1U;
		clk_disable(rtap->clk);

		return 0;
		}

		static int coh901331_set_alarm(struct device dev, struct rtc_wkalrm alarm)
		{
		struct coh901331_port *rtap = dev_get_drvdata(dev);
		unsigned long time = rtc_tm_to_time64(&alarm->time);

		clk_enable(rtap->clk);
		writel(time, rtap->virtbase + COH901331_ALARM);
		writel(alarm->enabled, rtap->virtbase + COH901331_IRQ_MASK);
		clk_disable(rtap->clk);

		return 0;
		}

		static int coh901331_alarm_irq_enable(struct device *dev, unsigned int enabled)
		{
		struct coh901331_port *rtap = dev_get_drvdata(dev);

		clk_enable(rtap->clk);
		if (enabled)
		writel(1, rtap->virtbase + COH901331_IRQ_MASK);
		else
		writel(0, rtap->virtbase + COH901331_IRQ_MASK);
		clk_disable(rtap->clk);

		return 0;
		}

		static const struct rtc_class_ops coh901331_ops = {
		.read_time = coh901331_read_time,
		.set_time = coh901331_set_time,
		.read_alarm = coh901331_read_alarm,
		.set_alarm = coh901331_set_alarm,
		.alarm_irq_enable = coh901331_alarm_irq_enable,
		};

		static int __exit coh901331_remove(struct platform_device *pdev)
		{
		struct coh901331_port *rtap = platform_get_drvdata(pdev);

		if (rtap)
		clk_unprepare(rtap->clk);

		return 0;
		}


		static int __init coh901331_probe(struct platform_device *pdev)
		{
		int ret;
		struct coh901331_port *rtap;

		rtap = devm_kzalloc(&pdev->dev,
		sizeof(struct coh901331_port), GFP_KERNEL);
		if (!rtap)
		return -ENOMEM;

		rtap->virtbase = devm_platform_ioremap_resource(pdev, 0);
		if (IS_ERR(rtap->virtbase))
		return PTR_ERR(rtap->virtbase);

		rtap->irq = platform_get_irq(pdev, 0);
		if (devm_request_irq(&pdev->dev, rtap->irq, coh901331_interrupt, 0,
		"RTC COH 901 331 Alarm", rtap))
		return -EIO;

		rtap->clk = devm_clk_get(&pdev->dev, NULL);
		if (IS_ERR(rtap->clk)) {
		ret = PTR_ERR(rtap->clk);
		dev_err(&pdev->dev, "could not get clock\n");
		return ret;
		}

		rtap->rtc = devm_rtc_allocate_device(&pdev->dev);
		if (IS_ERR(rtap->rtc))
		return PTR_ERR(rtap->rtc);

		rtap->rtc->ops = &coh901331_ops;
		rtap->rtc->range_max = U32_MAX;

		/* We enable/disable the clock only to assure it works */
		ret = clk_prepare_enable(rtap->clk);
		if (ret) {
		dev_err(&pdev->dev, "could not enable clock\n");
		return ret;
		}
		clk_disable(rtap->clk);

		platform_set_drvdata(pdev, rtap);

		ret = devm_rtc_register_device(rtap->rtc);
		if (ret)
		goto out_no_rtc;

		return 0;

		out_no_rtc:
		clk_unprepare(rtap->clk);
		return ret;
		}

		#ifdef CONFIG_PM_SLEEP
		static int coh901331_suspend(struct device *dev)
		{
		struct coh901331_port *rtap = dev_get_drvdata(dev);

		/*
		* 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.
		*/
		if (device_may_wakeup(dev)) {
		enable_irq_wake(rtap->irq);
		} else {
		clk_enable(rtap->clk);
		rtap->irqmaskstore = readl(rtap->virtbase + COH901331_IRQ_MASK);
		writel(0, rtap->virtbase + COH901331_IRQ_MASK);
		clk_disable(rtap->clk);
		}
		clk_unprepare(rtap->clk);
		return 0;
		}

		static int coh901331_resume(struct device *dev)
		{
		int ret;
		struct coh901331_port *rtap = dev_get_drvdata(dev);

		ret = clk_prepare(rtap->clk);
		if (ret)
		return ret;

		if (device_may_wakeup(dev)) {
		disable_irq_wake(rtap->irq);
		} else {
		clk_enable(rtap->clk);
		writel(rtap->irqmaskstore, rtap->virtbase + COH901331_IRQ_MASK);
		clk_disable(rtap->clk);
		}
		return 0;
		}
		#endif

		static SIMPLE_DEV_PM_OPS(coh901331_pm_ops, coh901331_suspend, coh901331_resume);

		static void coh901331_shutdown(struct platform_device *pdev)
		{
		struct coh901331_port *rtap = platform_get_drvdata(pdev);

		clk_enable(rtap->clk);
		writel(0, rtap->virtbase + COH901331_IRQ_MASK);
		clk_disable_unprepare(rtap->clk);
		}

		static const struct of_device_id coh901331_dt_match[] = {
		{ .compatible = "stericsson,coh901331" },
		{},
		};
		MODULE_DEVICE_TABLE(of, coh901331_dt_match);

		static struct platform_driver coh901331_driver = {
		.driver = {
		.name = "rtc-coh901331",
		.pm = &coh901331_pm_ops,
		.of_match_table = coh901331_dt_match,
		},
		.remove = __exit_p(coh901331_remove),
		.shutdown = coh901331_shutdown,
		};

		module_platform_driver_probe(coh901331_driver, coh901331_probe);

		MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
		MODULE_DESCRIPTION("ST-Ericsson AB COH 901 331 RTC Driver");
		MODULE_LICENSE("GPL");