1 files changed, 311 insertions, 0 deletions

diff --git a/drivers/rtc/rtc-coh901331.c b/drivers/rtc/rtc-coh901331.c
new file mode 100644
index 000000000000..7fe1fa26c52c
--- /dev/null
+++ b/drivers/rtc/rtc-coh901331.c
@@ -0,0 +1,311 @@
+/*
+ * Copyright (C) 2007-2009 ST-Ericsson AB
+ * License terms: GNU General Public License (GPL) version 2
+ * 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/rtc.h>
+#include <linux/clk.h>
+#include <linux/interrupt.h>
+#include <linux/pm.h>
+#include <linux/platform_device.h>
+#include <linux/io.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;
+        u32 phybase;
+        u32 physize;
+        void __iomem *virtbase;
+        int irq;
+#ifdef CONFIG_PM
+        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);
+        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)) {
+                rtc_time_to_tm(readl(rtap->virtbase + COH901331_CUR_TIME), tm);
+                clk_disable(rtap->clk);
+                return rtc_valid_tm(tm);
+        }
+        clk_disable(rtap->clk);
+        return -EINVAL;
+}
+
+static int coh901331_set_mmss(struct device *dev, unsigned long secs)
+{
+        struct coh901331_port *rtap = dev_get_drvdata(dev);
+
+        clk_enable(rtap->clk);
+        writel(secs, 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_time_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_time(&alarm->time, &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);
+}
+
+static struct rtc_class_ops coh901331_ops = {
+        .read_time = coh901331_read_time,
+        .set_mmss = coh901331_set_mmss,
+        .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 = dev_get_drvdata(&pdev->dev);
+
+        if (rtap) {
+                free_irq(rtap->irq, rtap);
+                rtc_device_unregister(rtap->rtc);
+                clk_put(rtap->clk);
+                iounmap(rtap->virtbase);
+                release_mem_region(rtap->phybase, rtap->physize);
+                platform_set_drvdata(pdev, NULL);
+                kfree(rtap);
+        }
+
+        return 0;
+}
+
+
+static int __init coh901331_probe(struct platform_device *pdev)
+{
+        int ret;
+        struct coh901331_port *rtap;
+        struct resource *res;
+
+        rtap = kzalloc(sizeof(struct coh901331_port), GFP_KERNEL);
+        if (!rtap)
+                return -ENOMEM;
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!res) {
+                ret = -ENOENT;
+                goto out_no_resource;
+        }
+        rtap->phybase = res->start;
+        rtap->physize = resource_size(res);
+
+        if (request_mem_region(rtap->phybase, rtap->physize,
+                               "rtc-coh901331") == NULL) {
+                ret = -EBUSY;
+                goto out_no_memregion;
+        }
+
+        rtap->virtbase = ioremap(rtap->phybase, rtap->physize);
+        if (!rtap->virtbase) {
+                ret = -ENOMEM;
+                goto out_no_remap;
+        }
+
+        rtap->irq = platform_get_irq(pdev, 0);
+        if (request_irq(rtap->irq, coh901331_interrupt, IRQF_DISABLED,
+                        "RTC COH 901 331 Alarm", rtap)) {
+                ret = -EIO;
+                goto out_no_irq;
+        }
+
+        rtap->clk = clk_get(&pdev->dev, NULL);
+        if (IS_ERR(rtap->clk)) {
+                ret = PTR_ERR(rtap->clk);
+                dev_err(&pdev->dev, "could not get clock\n");
+                goto out_no_clk;
+        }
+
+        /* We enable/disable the clock only to assure it works */
+        ret = clk_enable(rtap->clk);
+        if (ret) {
+                dev_err(&pdev->dev, "could not enable clock\n");
+                goto out_no_clk_enable;
+        }
+        clk_disable(rtap->clk);
+
+        rtap->rtc = rtc_device_register("coh901331", &pdev->dev, &coh901331_ops,
+                                         THIS_MODULE);
+        if (IS_ERR(rtap->rtc)) {
+                ret = PTR_ERR(rtap->rtc);
+                goto out_no_rtc;
+        }
+
+        platform_set_drvdata(pdev, rtap);
+
+        return 0;
+
+ out_no_rtc:
+ out_no_clk_enable:
+        clk_put(rtap->clk);
+ out_no_clk:
+        free_irq(rtap->irq, rtap);
+ out_no_irq:
+        iounmap(rtap->virtbase);
+ out_no_remap:
+        platform_set_drvdata(pdev, NULL);
+ out_no_memregion:
+        release_mem_region(rtap->phybase, SZ_4K);
+ out_no_resource:
+        kfree(rtap);
+        return ret;
+}
+
+#ifdef CONFIG_PM
+static int coh901331_suspend(struct platform_device *pdev, pm_message_t state)
+{
+        struct coh901331_port *rtap = dev_get_drvdata(&pdev->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(&pdev->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);
+        }
+        return 0;
+}
+
+static int coh901331_resume(struct platform_device *pdev)
+{
+        struct coh901331_port *rtap = dev_get_drvdata(&pdev->dev);
+
+        if (device_may_wakeup(&pdev->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;
+}
+#else
+#define coh901331_suspend NULL
+#define coh901331_resume NULL
+#endif
+
+static void coh901331_shutdown(struct platform_device *pdev)
+{
+        struct coh901331_port *rtap = dev_get_drvdata(&pdev->dev);
+
+        clk_enable(rtap->clk);
+        writel(0, rtap->virtbase + COH901331_IRQ_MASK);
+        clk_disable(rtap->clk);
+}
+
+static struct platform_driver coh901331_driver = {
+        .driver = {
+                .name = "rtc-coh901331",
+                .owner = THIS_MODULE,
+        },
+        .remove = __exit_p(coh901331_remove),
+        .suspend = coh901331_suspend,
+        .resume = coh901331_resume,
+        .shutdown = coh901331_shutdown,
+};
+
+static int __init coh901331_init(void)
+{
+        return platform_driver_probe(&coh901331_driver, coh901331_probe);
+}
+
+static void __exit coh901331_exit(void)
+{
+        platform_driver_unregister(&coh901331_driver);
+}
+
+module_init(coh901331_init);
+module_exit(coh901331_exit);
+
+MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
+MODULE_DESCRIPTION("ST-Ericsson AB COH 901 331 RTC Driver");
+MODULE_LICENSE("GPL");