--- /dev/null
+/*
+ * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
+ * Copyright (C) 2010, Paul Cercueil <paul@crapouillou.net>
+ * JZ4740 SoC RTC driver
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/rtc.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+
+#define JZ_REG_RTC_CTRL 0x00
+#define JZ_REG_RTC_SEC 0x04
+#define JZ_REG_RTC_SEC_ALARM 0x08
+#define JZ_REG_RTC_REGULATOR 0x0C
+#define JZ_REG_RTC_HIBERNATE 0x20
+#define JZ_REG_RTC_SCRATCHPAD 0x34
+
+#define JZ_RTC_CTRL_WRDY BIT(7)
+#define JZ_RTC_CTRL_1HZ BIT(6)
+#define JZ_RTC_CTRL_1HZ_IRQ BIT(5)
+#define JZ_RTC_CTRL_AF BIT(4)
+#define JZ_RTC_CTRL_AF_IRQ BIT(3)
+#define JZ_RTC_CTRL_AE BIT(2)
+#define JZ_RTC_CTRL_ENABLE BIT(0)
+
+struct jz4740_rtc {
+ void __iomem *base;
+
+ struct rtc_device *rtc;
+
+ int irq;
+
+ spinlock_t lock;
+};
+
+static inline uint32_t jz4740_rtc_reg_read(struct jz4740_rtc *rtc, size_t reg)
+{
+ return readl(rtc->base + reg);
+}
+
+static int jz4740_rtc_wait_write_ready(struct jz4740_rtc *rtc)
+{
+ uint32_t ctrl;
+ int timeout = 1000;
+
+ do {
+ ctrl = jz4740_rtc_reg_read(rtc, JZ_REG_RTC_CTRL);
+ } while (!(ctrl & JZ_RTC_CTRL_WRDY) && --timeout);
+
+ return timeout ? 0 : -EIO;
+}
+
+static inline int jz4740_rtc_reg_write(struct jz4740_rtc *rtc, size_t reg,
+ uint32_t val)
+{
+ int ret;
+ ret = jz4740_rtc_wait_write_ready(rtc);
+ if (ret == 0)
+ writel(val, rtc->base + reg);
+
+ return ret;
+}
+
+static int jz4740_rtc_ctrl_set_bits(struct jz4740_rtc *rtc, uint32_t mask,
+ bool set)
+{
+ int ret;
+ unsigned long flags;
+ uint32_t ctrl;
+
+ spin_lock_irqsave(&rtc->lock, flags);
+
+ ctrl = jz4740_rtc_reg_read(rtc, JZ_REG_RTC_CTRL);
+
+ /* Don't clear interrupt flags by accident */
+ ctrl |= JZ_RTC_CTRL_1HZ | JZ_RTC_CTRL_AF;
+
+ if (set)
+ ctrl |= mask;
+ else
+ ctrl &= ~mask;
+
+ ret = jz4740_rtc_reg_write(rtc, JZ_REG_RTC_CTRL, ctrl);
+
+ spin_unlock_irqrestore(&rtc->lock, flags);
+
+ return ret;
+}
+
+static int jz4740_rtc_read_time(struct device *dev, struct rtc_time *time)
+{
+ struct jz4740_rtc *rtc = dev_get_drvdata(dev);
+ uint32_t secs, secs2;
+ int timeout = 5;
+
+ /* If the seconds register is read while it is updated, it can contain a
+ * bogus value. This can be avoided by making sure that two consecutive
+ * reads have the same value.
+ */
+ secs = jz4740_rtc_reg_read(rtc, JZ_REG_RTC_SEC);
+ secs2 = jz4740_rtc_reg_read(rtc, JZ_REG_RTC_SEC);
+
+ while (secs != secs2 && --timeout) {
+ secs = secs2;
+ secs2 = jz4740_rtc_reg_read(rtc, JZ_REG_RTC_SEC);
+ }
+
+ if (timeout == 0)
+ return -EIO;
+
+ rtc_time_to_tm(secs, time);
+
+ return rtc_valid_tm(time);
+}
+
+static int jz4740_rtc_set_mmss(struct device *dev, unsigned long secs)
+{
+ struct jz4740_rtc *rtc = dev_get_drvdata(dev);
+
+ return jz4740_rtc_reg_write(rtc, JZ_REG_RTC_SEC, secs);
+}
+
+static int jz4740_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+ struct jz4740_rtc *rtc = dev_get_drvdata(dev);
+ uint32_t secs;
+ uint32_t ctrl;
+
+ secs = jz4740_rtc_reg_read(rtc, JZ_REG_RTC_SEC_ALARM);
+
+ ctrl = jz4740_rtc_reg_read(rtc, JZ_REG_RTC_CTRL);
+
+ alrm->enabled = !!(ctrl & JZ_RTC_CTRL_AE);
+ alrm->pending = !!(ctrl & JZ_RTC_CTRL_AF);
+
+ rtc_time_to_tm(secs, &alrm->time);
+
+ return rtc_valid_tm(&alrm->time);
+}
+
+static int jz4740_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+ int ret;
+ struct jz4740_rtc *rtc = dev_get_drvdata(dev);
+ unsigned long secs;
+
+ rtc_tm_to_time(&alrm->time, &secs);
+
+ ret = jz4740_rtc_reg_write(rtc, JZ_REG_RTC_SEC_ALARM, secs);
+ if (!ret)
+ ret = jz4740_rtc_ctrl_set_bits(rtc,
+ JZ_RTC_CTRL_AE | JZ_RTC_CTRL_AF_IRQ, alrm->enabled);
+
+ return ret;
+}
+
+static int jz4740_rtc_alarm_irq_enable(struct device *dev, unsigned int enable)
+{
+ struct jz4740_rtc *rtc = dev_get_drvdata(dev);
+ return jz4740_rtc_ctrl_set_bits(rtc, JZ_RTC_CTRL_AF_IRQ, enable);
+}
+
+static struct rtc_class_ops jz4740_rtc_ops = {
+ .read_time = jz4740_rtc_read_time,
+ .set_mmss = jz4740_rtc_set_mmss,
+ .read_alarm = jz4740_rtc_read_alarm,
+ .set_alarm = jz4740_rtc_set_alarm,
+ .alarm_irq_enable = jz4740_rtc_alarm_irq_enable,
+};
+
+static irqreturn_t jz4740_rtc_irq(int irq, void *data)
+{
+ struct jz4740_rtc *rtc = data;
+ uint32_t ctrl;
+ unsigned long events = 0;
+
+ ctrl = jz4740_rtc_reg_read(rtc, JZ_REG_RTC_CTRL);
+
+ if (ctrl & JZ_RTC_CTRL_1HZ)
+ events |= (RTC_UF | RTC_IRQF);
+
+ if (ctrl & JZ_RTC_CTRL_AF)
+ events |= (RTC_AF | RTC_IRQF);
+
+ rtc_update_irq(rtc->rtc, 1, events);
+
+ jz4740_rtc_ctrl_set_bits(rtc, JZ_RTC_CTRL_1HZ | JZ_RTC_CTRL_AF, false);
+
+ return IRQ_HANDLED;
+}
+
+void jz4740_rtc_poweroff(struct device *dev)
+{
+ struct jz4740_rtc *rtc = dev_get_drvdata(dev);
+ jz4740_rtc_reg_write(rtc, JZ_REG_RTC_HIBERNATE, 1);
+}
+EXPORT_SYMBOL_GPL(jz4740_rtc_poweroff);
+
+static int jz4740_rtc_probe(struct platform_device *pdev)
+{
+ int ret;
+ struct jz4740_rtc *rtc;
+ uint32_t scratchpad;
+ struct resource *mem;
+
+ rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
+ if (!rtc)
+ return -ENOMEM;
+
+ rtc->irq = platform_get_irq(pdev, 0);
+ if (rtc->irq < 0) {
+ dev_err(&pdev->dev, "Failed to get platform irq\n");
+ return -ENOENT;
+ }
+
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ rtc->base = devm_ioremap_resource(&pdev->dev, mem);
+ if (IS_ERR(rtc->base))
+ return PTR_ERR(rtc->base);
+
+ spin_lock_init(&rtc->lock);
+
+ platform_set_drvdata(pdev, rtc);
+
+ device_init_wakeup(&pdev->dev, 1);
+
+ rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
+ &jz4740_rtc_ops, THIS_MODULE);
+ if (IS_ERR(rtc->rtc)) {
+ ret = PTR_ERR(rtc->rtc);
+ dev_err(&pdev->dev, "Failed to register rtc device: %d\n", ret);
+ return ret;
+ }
+
+ ret = devm_request_irq(&pdev->dev, rtc->irq, jz4740_rtc_irq, 0,
+ pdev->name, rtc);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to request rtc irq: %d\n", ret);
+ return ret;
+ }
+
+ scratchpad = jz4740_rtc_reg_read(rtc, JZ_REG_RTC_SCRATCHPAD);
+ if (scratchpad != 0x12345678) {
+ ret = jz4740_rtc_reg_write(rtc, JZ_REG_RTC_SCRATCHPAD, 0x12345678);
+ ret = jz4740_rtc_reg_write(rtc, JZ_REG_RTC_SEC, 0);
+ if (ret) {
+ dev_err(&pdev->dev, "Could not write write to RTC registers\n");
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int jz4740_rtc_suspend(struct device *dev)
+{
+ struct jz4740_rtc *rtc = dev_get_drvdata(dev);
+
+ if (device_may_wakeup(dev))
+ enable_irq_wake(rtc->irq);
+ return 0;
+}
+
+static int jz4740_rtc_resume(struct device *dev)
+{
+ struct jz4740_rtc *rtc = dev_get_drvdata(dev);
+
+ if (device_may_wakeup(dev))
+ disable_irq_wake(rtc->irq);
+ return 0;
+}
+
+static const struct dev_pm_ops jz4740_pm_ops = {
+ .suspend = jz4740_rtc_suspend,
+ .resume = jz4740_rtc_resume,
+};
+#define JZ4740_RTC_PM_OPS (&jz4740_pm_ops)
+
+#else
+#define JZ4740_RTC_PM_OPS NULL
+#endif /* CONFIG_PM */
+
+static struct platform_driver jz4740_rtc_driver = {
+ .probe = jz4740_rtc_probe,
+ .driver = {
+ .name = "jz4740-rtc",
+ .pm = JZ4740_RTC_PM_OPS,
+ },
+};
+
+module_platform_driver(jz4740_rtc_driver);
+
+MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("RTC driver for the JZ4740 SoC\n");
+MODULE_ALIAS("platform:jz4740-rtc");
Code Review / kvmfornfv.git / blobdiff