RTC: sa1100: support sa1100, pxa and mmp soc families

Since the regmap of rtc on sa1100, pxa and mmp Marvell soc families are
almost the same, so re-arch the rtc-sa1100 to support them.

Signed-off-by: Jett.Zhou <jtzhou@marvell.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Haojian Zhuang <haojian.zhuang@gmail.com>
Acked-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

2 files changed, 178 insertions, 80 deletions

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 53eb4e55b289..877cf6fdcf24 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -774,7 +774,7 @@ config RTC_DRV_EP93XX
 
 config RTC_DRV_SA1100
         tristate "SA11x0/PXA2xx"
-        depends on ARCH_SA1100 || ARCH_PXA
+        depends on ARCH_SA1100 || ARCH_PXA || ARCH_MMP
         help
           If you say Y here you will get access to the real time clock
           built into your SA11x0 or PXA2xx CPU.
diff --git a/drivers/rtc/rtc-sa1100.c b/drivers/rtc/rtc-sa1100.c
index d268cf11b367..fc1ffe97fca1 100644
--- a/drivers/rtc/rtc-sa1100.c
+++ b/drivers/rtc/rtc-sa1100.c
@@ -27,24 +27,42 @@
 #include <linux/init.h>
 #include <linux/fs.h>
 #include <linux/interrupt.h>
-#include <linux/string.h>
 #include <linux/pm.h>
-#include <linux/bitops.h>
+#include <linux/slab.h>
+#include <linux/clk.h>
+#include <linux/io.h>
 
 #include <mach/hardware.h>
 #include <asm/irq.h>
 
-#ifdef CONFIG_ARCH_PXA
-#include <mach/regs-rtc.h>
-#endif
-
 #define RTC_DEF_DIVIDER         (32768 - 1)
 #define RTC_DEF_TRIM            0
-
-static const unsigned long RTC_FREQ = 1024;
-static struct rtc_time rtc_alarm;
-static DEFINE_SPINLOCK(sa1100_rtc_lock);
-
+#define RTC_FREQ                1024
+
+#define RCNR            0x00    /* RTC Count Register */
+#define RTAR            0x04    /* RTC Alarm Register */
+#define RTSR            0x08    /* RTC Status Register */
+#define RTTR            0x0c    /* RTC Timer Trim Register */
+
+#define RTSR_HZE        (1 << 3)        /* HZ interrupt enable */
+#define RTSR_ALE        (1 << 2)        /* RTC alarm interrupt enable */
+#define RTSR_HZ         (1 << 1)        /* HZ rising-edge detected */
+#define RTSR_AL         (1 << 0)        /* RTC alarm detected */
+
+#define rtc_readl(sa1100_rtc, reg)      \
+        readl_relaxed((sa1100_rtc)->base + (reg))
+#define rtc_writel(sa1100_rtc, reg, value)      \
+        writel_relaxed((value), (sa1100_rtc)->base + (reg))
+
+struct sa1100_rtc {
+        struct resource         *ress;
+        void __iomem            *base;
+        struct clk              *clk;
+        int                     irq_1Hz;
+        int                     irq_Alrm;
+        struct rtc_device       *rtc;
+        spinlock_t              lock;           /* Protects this structure */
+};
 /*
  * Calculate the next alarm time given the requested alarm time mask
  * and the current time.
@@ -75,22 +93,23 @@ static void rtc_next_alarm_time(struct rtc_time *next, struct rtc_time *now,
 static irqreturn_t sa1100_rtc_interrupt(int irq, void *dev_id)
 {
         struct platform_device *pdev = to_platform_device(dev_id);
-        struct rtc_device *rtc = platform_get_drvdata(pdev);
+        struct sa1100_rtc *sa1100_rtc = platform_get_drvdata(pdev);
         unsigned int rtsr;
         unsigned long events = 0;
 
-        spin_lock(&sa1100_rtc_lock);
+        spin_lock(&sa1100_rtc->lock);
 
-        rtsr = RTSR;
         /* clear interrupt sources */
-        RTSR = 0;
+        rtsr = rtc_readl(sa1100_rtc, RTSR);
+        rtc_writel(sa1100_rtc, RTSR, 0);
+
         /* Fix for a nasty initialization problem the in SA11xx RTSR register.
          * See also the comments in sa1100_rtc_probe(). */
         if (rtsr & (RTSR_ALE | RTSR_HZE)) {
                 /* This is the original code, before there was the if test
                  * above. This code does not clear interrupts that were not
                  * enabled. */
-                RTSR = (RTSR_AL | RTSR_HZ) & (rtsr >> 2);
+                rtc_writel(sa1100_rtc, RTSR, (RTSR_AL | RTSR_HZ) & (rtsr >> 2));
         } else {
                 /* For some reason, it is possible to enter this routine
                  * without interruptions enabled, it has been tested with
@@ -99,13 +118,13 @@ static irqreturn_t sa1100_rtc_interrupt(int irq, void *dev_id)
                  * This situation leads to an infinite "loop" of interrupt
                  * routine calling and as a result the processor seems to
                  * lock on its first call to open(). */
-                RTSR = RTSR_AL | RTSR_HZ;
+                rtc_writel(sa1100_rtc, RTSR, (RTSR_AL | RTSR_HZ));
         }
 
         /* clear alarm interrupt if it has occurred */
         if (rtsr & RTSR_AL)
                 rtsr &= ~RTSR_ALE;
-        RTSR = rtsr & (RTSR_ALE | RTSR_HZE);
+        rtc_writel(sa1100_rtc, RTSR, rtsr & (RTSR_ALE | RTSR_HZE));
 
         /* update irq data & counter */
         if (rtsr & RTSR_AL)
@@ -113,86 +132,100 @@ static irqreturn_t sa1100_rtc_interrupt(int irq, void *dev_id)
         if (rtsr & RTSR_HZ)
                 events |= RTC_UF | RTC_IRQF;
 
-        rtc_update_irq(rtc, 1, events);
+        rtc_update_irq(sa1100_rtc->rtc, 1, events);
 
-        spin_unlock(&sa1100_rtc_lock);
+        spin_unlock(&sa1100_rtc->lock);
 
         return IRQ_HANDLED;
 }
 
 static int sa1100_rtc_open(struct device *dev)
 {
+        struct sa1100_rtc *sa1100_rtc = dev_get_drvdata(dev);
         int ret;
-        struct platform_device *plat_dev = to_platform_device(dev);
-        struct rtc_device *rtc = platform_get_drvdata(plat_dev);
 
-        ret = request_irq(IRQ_RTC1Hz, sa1100_rtc_interrupt, IRQF_DISABLED,
-                "rtc 1Hz", dev);
+        ret = request_irq(sa1100_rtc->irq_1Hz, sa1100_rtc_interrupt,
+                                IRQF_DISABLED, "rtc 1Hz", dev);
         if (ret) {
-                dev_err(dev, "IRQ %d already in use.\n", IRQ_RTC1Hz);
+                dev_err(dev, "IRQ %d already in use.\n", sa1100_rtc->irq_1Hz);
                 goto fail_ui;
         }
-        ret = request_irq(IRQ_RTCAlrm, sa1100_rtc_interrupt, IRQF_DISABLED,
-                "rtc Alrm", dev);
+        ret = request_irq(sa1100_rtc->irq_Alrm, sa1100_rtc_interrupt,
+                                IRQF_DISABLED, "rtc Alrm", dev);
         if (ret) {
-                dev_err(dev, "IRQ %d already in use.\n", IRQ_RTCAlrm);
+                dev_err(dev, "IRQ %d already in use.\n", sa1100_rtc->irq_Alrm);
                 goto fail_ai;
         }
-        rtc->max_user_freq = RTC_FREQ;
-        rtc_irq_set_freq(rtc, NULL, RTC_FREQ);
+        sa1100_rtc->rtc->max_user_freq = RTC_FREQ;
+        rtc_irq_set_freq(sa1100_rtc->rtc, NULL, RTC_FREQ);
 
         return 0;
 
  fail_ai:
-        free_irq(IRQ_RTC1Hz, dev);
+        free_irq(sa1100_rtc->irq_1Hz, dev);
  fail_ui:
         return ret;
 }
 
 static void sa1100_rtc_release(struct device *dev)
 {
-        spin_lock_irq(&sa1100_rtc_lock);
-        RTSR = 0;
-        spin_unlock_irq(&sa1100_rtc_lock);
+        struct sa1100_rtc *sa1100_rtc = dev_get_drvdata(dev);
 
-        free_irq(IRQ_RTCAlrm, dev);
-        free_irq(IRQ_RTC1Hz, dev);
+        spin_lock_irq(&sa1100_rtc->lock);
+        rtc_writel(sa1100_rtc, RTSR, 0);
+        spin_unlock_irq(&sa1100_rtc->lock);
+
+        free_irq(sa1100_rtc->irq_Alrm, dev);
+        free_irq(sa1100_rtc->irq_1Hz, dev);
 }
 
 static int sa1100_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
 {
-        spin_lock_irq(&sa1100_rtc_lock);
+        struct sa1100_rtc *sa1100_rtc = dev_get_drvdata(dev);
+        unsigned int rtsr;
+
+        spin_lock_irq(&sa1100_rtc->lock);
+
+        rtsr = rtc_readl(sa1100_rtc, RTSR);
         if (enabled)
-                RTSR |= RTSR_ALE;
+                rtsr |= RTSR_ALE;
         else
-                RTSR &= ~RTSR_ALE;
-        spin_unlock_irq(&sa1100_rtc_lock);
+                rtsr &= ~RTSR_ALE;
+        rtc_writel(sa1100_rtc, RTSR, rtsr);
+
+        spin_unlock_irq(&sa1100_rtc->lock);
         return 0;
 }
 
 static int sa1100_rtc_read_time(struct device *dev, struct rtc_time *tm)
 {
-        rtc_time_to_tm(RCNR, tm);
+        struct sa1100_rtc *sa1100_rtc = dev_get_drvdata(dev);
+
+        rtc_time_to_tm(rtc_readl(sa1100_rtc, RCNR), tm);
         return 0;
 }
 
 static int sa1100_rtc_set_time(struct device *dev, struct rtc_time *tm)
 {
+        struct sa1100_rtc *sa1100_rtc = dev_get_drvdata(dev);
         unsigned long time;
         int ret;
 
         ret = rtc_tm_to_time(tm, &time);
         if (ret == 0)
-                RCNR = time;
+                rtc_writel(sa1100_rtc, RCNR, time);
         return ret;
 }
 
 static int sa1100_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 {
-        u32     rtsr;
+        struct sa1100_rtc *sa1100_rtc = dev_get_drvdata(dev);
+        unsigned long time;
+        unsigned int rtsr;
 
-        memcpy(&alrm->time, &rtc_alarm, sizeof(struct rtc_time));
-        rtsr = RTSR;
+        time = rtc_readl(sa1100_rtc, RCNR);
+        rtc_time_to_tm(time, &alrm->time);
+        rtsr = rtc_readl(sa1100_rtc, RTSR);
         alrm->enabled = (rtsr & RTSR_ALE) ? 1 : 0;
         alrm->pending = (rtsr & RTSR_AL) ? 1 : 0;
         return 0;
@@ -200,31 +233,39 @@ static int sa1100_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 
 static int sa1100_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 {
+        struct sa1100_rtc *sa1100_rtc = dev_get_drvdata(dev);
         struct rtc_time now_tm, alarm_tm;
-        int ret;
+        unsigned long time, alarm;
+        unsigned int rtsr;
+
+        spin_lock_irq(&sa1100_rtc->lock);
 
-        spin_lock_irq(&sa1100_rtc_lock);
+        time = rtc_readl(sa1100_rtc, RCNR);
+        rtc_time_to_tm(time, &now_tm);
+        rtc_next_alarm_time(&alarm_tm, &now_tm, &alrm->time);
+        rtc_tm_to_time(&alarm_tm, &alarm);
+        rtc_writel(sa1100_rtc, RTAR, alarm);
 
-        now = RCNR;
-        rtc_time_to_tm(now, &now_tm);
-        rtc_next_alarm_time(&alarm_tm, &now_tm, alrm->time);
-        rtc_tm_to_time(&alarm_tm, &time);
-        RTAR = time;
+        rtsr = rtc_readl(sa1100_rtc, RTSR);
         if (alrm->enabled)
-                RTSR |= RTSR_ALE;
+                rtsr |= RTSR_ALE;
         else
-                RTSR &= ~RTSR_ALE;
+                rtsr &= ~RTSR_ALE;
+        rtc_writel(sa1100_rtc, RTSR, rtsr);
 
-        spin_unlock_irq(&sa1100_rtc_lock);
+        spin_unlock_irq(&sa1100_rtc->lock);
 
-        return ret;
+        return 0;
 }
 
 static int sa1100_rtc_proc(struct device *dev, struct seq_file *seq)
 {
-        seq_printf(seq, "trim/divider\t\t: 0x%08x\n", (u32) RTTR);
-        seq_printf(seq, "RTSR\t\t\t: 0x%08x\n", (u32)RTSR);
+        struct sa1100_rtc *sa1100_rtc = dev_get_drvdata(dev);
 
+        seq_printf(seq, "trim/divider\t\t: 0x%08x\n",
+                        rtc_readl(sa1100_rtc, RTTR));
+        seq_printf(seq, "RTSR\t\t\t: 0x%08x\n",
+                        rtc_readl(sa1100_rtc, RTSR));
         return 0;
 }
 
@@ -241,7 +282,51 @@ static const struct rtc_class_ops sa1100_rtc_ops = {
 
 static int sa1100_rtc_probe(struct platform_device *pdev)
 {
-        struct rtc_device *rtc;
+        struct sa1100_rtc *sa1100_rtc;
+        unsigned int rttr;
+        int ret;
+
+        sa1100_rtc = kzalloc(sizeof(struct sa1100_rtc), GFP_KERNEL);
+        if (!sa1100_rtc)
+                return -ENOMEM;
+
+        spin_lock_init(&sa1100_rtc->lock);
+        platform_set_drvdata(pdev, sa1100_rtc);
+
+        ret = -ENXIO;
+        sa1100_rtc->ress = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!sa1100_rtc->ress) {
+                dev_err(&pdev->dev, "No I/O memory resource defined\n");
+                goto err_ress;
+        }
+
+        sa1100_rtc->irq_1Hz = platform_get_irq(pdev, 0);
+        if (sa1100_rtc->irq_1Hz < 0) {
+                dev_err(&pdev->dev, "No 1Hz IRQ resource defined\n");
+                goto err_ress;
+        }
+        sa1100_rtc->irq_Alrm = platform_get_irq(pdev, 1);
+        if (sa1100_rtc->irq_Alrm < 0) {
+                dev_err(&pdev->dev, "No alarm IRQ resource defined\n");
+                goto err_ress;
+        }
+
+        ret = -ENOMEM;
+        sa1100_rtc->base = ioremap(sa1100_rtc->ress->start,
+                                resource_size(sa1100_rtc->ress));
+        if (!sa1100_rtc->base) {
+                dev_err(&pdev->dev, "Unable to map pxa RTC I/O memory\n");
+                goto err_map;
+        }
+
+        sa1100_rtc->clk = clk_get(&pdev->dev, NULL);
+        if (IS_ERR(sa1100_rtc->clk)) {
+                dev_err(&pdev->dev, "failed to find rtc clock source\n");
+                ret = PTR_ERR(sa1100_rtc->clk);
+                goto err_clk;
+        }
+        clk_prepare(sa1100_rtc->clk);
+        clk_enable(sa1100_rtc->clk);
 
         /*
          * According to the manual we should be able to let RTTR be zero
@@ -250,24 +335,24 @@ static int sa1100_rtc_probe(struct platform_device *pdev)
          * If the clock divider is uninitialized then reset it to the
          * default value to get the 1Hz clock.
          */
-        if (RTTR == 0) {
-                RTTR = RTC_DEF_DIVIDER + (RTC_DEF_TRIM << 16);
-                dev_warn(&pdev->dev, "warning: "
-                        "initializing default clock divider/trim value\n");
+        if (rtc_readl(sa1100_rtc, RTTR) == 0) {
+                rttr = RTC_DEF_DIVIDER + (RTC_DEF_TRIM << 16);
+                rtc_writel(sa1100_rtc, RTTR, rttr);
+                dev_warn(&pdev->dev, "warning: initializing default clock"
+                         " divider/trim value\n");
                 /* The current RTC value probably doesn't make sense either */
-                RCNR = 0;
+                rtc_writel(sa1100_rtc, RCNR, 0);
         }
 
         device_init_wakeup(&pdev->dev, 1);
 
-        rtc = rtc_device_register(pdev->name, &pdev->dev, &sa1100_rtc_ops,
-                THIS_MODULE);
-
-        if (IS_ERR(rtc))
-                return PTR_ERR(rtc);
-
-        platform_set_drvdata(pdev, rtc);
-
+        sa1100_rtc->rtc = rtc_device_register(pdev->name, &pdev->dev,
+                                                &sa1100_rtc_ops, THIS_MODULE);
+        if (IS_ERR(sa1100_rtc->rtc)) {
+                dev_err(&pdev->dev, "Failed to register RTC device -> %d\n",
+                        ret);
+                goto err_rtc_reg;
+        }
         /* Fix for a nasty initialization problem the in SA11xx RTSR register.
          * See also the comments in sa1100_rtc_interrupt().
          *
@@ -290,33 +375,46 @@ static int sa1100_rtc_probe(struct platform_device *pdev)
          *
          * Notice that clearing bit 1 and 0 is accomplished by writting ONES to
          * the corresponding bits in RTSR. */
-        RTSR = RTSR_AL | RTSR_HZ;
+        rtc_writel(sa1100_rtc, RTSR, (RTSR_AL | RTSR_HZ));
 
         return 0;
+
+err_rtc_reg:
+err_clk:
+        iounmap(sa1100_rtc->base);
+err_ress:
+err_map:
+        kfree(sa1100_rtc);
+        return ret;
 }
 
 static int sa1100_rtc_remove(struct platform_device *pdev)
 {
-        struct rtc_device *rtc = platform_get_drvdata(pdev);
-
-        if (rtc)
-                rtc_device_unregister(rtc);
+        struct sa1100_rtc *sa1100_rtc = platform_get_drvdata(pdev);
 
+        rtc_device_unregister(sa1100_rtc->rtc);
+        clk_disable(sa1100_rtc->clk);
+        clk_unprepare(sa1100_rtc->clk);
+        iounmap(sa1100_rtc->base);
         return 0;
 }
 
 #ifdef CONFIG_PM
 static int sa1100_rtc_suspend(struct device *dev)
 {
+        struct sa1100_rtc *sa1100_rtc = dev_get_drvdata(dev);
+
         if (device_may_wakeup(dev))
-                enable_irq_wake(IRQ_RTCAlrm);
+                enable_irq_wake(sa1100_rtc->irq_Alrm);
         return 0;
 }
 
 static int sa1100_rtc_resume(struct device *dev)
 {
+        struct sa1100_rtc *sa1100_rtc = dev_get_drvdata(dev);
+
         if (device_may_wakeup(dev))
-                disable_irq_wake(IRQ_RTCAlrm);
+                disable_irq_wake(sa1100_rtc->irq_Alrm);
         return 0;
 }