1 files changed, 113 insertions, 182 deletions

diff --git a/drivers/rtc/rtc-sa1100.c b/drivers/rtc/rtc-sa1100.c
index 4595d3e645a7..cb9a585312cc 100644
--- a/drivers/rtc/rtc-sa1100.c
+++ b/drivers/rtc/rtc-sa1100.c
@@ -27,42 +27,34 @@
 #include <linux/init.h>
 #include <linux/fs.h>
 #include <linux/interrupt.h>
+#include <linux/string.h>
 #include <linux/pm.h>
-#include <linux/slab.h>
-#include <linux/clk.h>
-#include <linux/io.h>
+#include <linux/bitops.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
-#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 */
-};
+
+static const unsigned long RTC_FREQ = 1024;
+static struct rtc_time rtc_alarm;
+static DEFINE_SPINLOCK(sa1100_rtc_lock);
+
+static inline int rtc_periodic_alarm(struct rtc_time *tm)
+{
+        return  (tm->tm_year == -1) ||
+                ((unsigned)tm->tm_mon >= 12) ||
+                ((unsigned)(tm->tm_mday - 1) >= 31) ||
+                ((unsigned)tm->tm_hour > 23) ||
+                ((unsigned)tm->tm_min > 59) ||
+                ((unsigned)tm->tm_sec > 59);
+}
+
 /*
  * Calculate the next alarm time given the requested alarm time mask
  * and the current time.
@@ -90,26 +82,46 @@ static void rtc_next_alarm_time(struct rtc_time *next, struct rtc_time *now,
         }
 }
 
+static int rtc_update_alarm(struct rtc_time *alrm)
+{
+        struct rtc_time alarm_tm, now_tm;
+        unsigned long now, time;
+        int ret;
+
+        do {
+                now = RCNR;
+                rtc_time_to_tm(now, &now_tm);
+                rtc_next_alarm_time(&alarm_tm, &now_tm, alrm);
+                ret = rtc_tm_to_time(&alarm_tm, &time);
+                if (ret != 0)
+                        break;
+
+                RTSR = RTSR & (RTSR_HZE|RTSR_ALE|RTSR_AL);
+                RTAR = time;
+        } while (now != RCNR);
+
+        return ret;
+}
+
 static irqreturn_t sa1100_rtc_interrupt(int irq, void *dev_id)
 {
         struct platform_device *pdev = to_platform_device(dev_id);
-        struct sa1100_rtc *sa1100_rtc = platform_get_drvdata(pdev);
+        struct rtc_device *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 = rtc_readl(sa1100_rtc, RTSR);
-        rtc_writel(sa1100_rtc, RTSR, 0);
-
+        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. */
-                rtc_writel(sa1100_rtc, RTSR, (RTSR_AL | RTSR_HZ) & (rtsr >> 2));
+                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
@@ -118,13 +130,13 @@ 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(). */
-                rtc_writel(sa1100_rtc, RTSR, (RTSR_AL | RTSR_HZ));
+                RTSR = RTSR_AL | RTSR_HZ;
         }
 
         /* clear alarm interrupt if it has occurred */
         if (rtsr & RTSR_AL)
                 rtsr &= ~RTSR_ALE;
-        rtc_writel(sa1100_rtc, RTSR, rtsr & (RTSR_ALE | RTSR_HZE));
+        RTSR = rtsr & (RTSR_ALE | RTSR_HZE);
 
         /* update irq data & counter */
         if (rtsr & RTSR_AL)
@@ -132,100 +144,89 @@ static irqreturn_t sa1100_rtc_interrupt(int irq, void *dev_id)
         if (rtsr & RTSR_HZ)
                 events |= RTC_UF | RTC_IRQF;
 
-        rtc_update_irq(sa1100_rtc->rtc, 1, events);
+        rtc_update_irq(rtc, 1, events);
 
-        spin_unlock(&sa1100_rtc->lock);
+        if (rtsr & RTSR_AL && rtc_periodic_alarm(&rtc_alarm))
+                rtc_update_alarm(&rtc_alarm);
+
+        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(sa1100_rtc->irq_1Hz, sa1100_rtc_interrupt,
-                                IRQF_DISABLED, "rtc 1Hz", dev);
+        ret = request_irq(IRQ_RTC1Hz, sa1100_rtc_interrupt, IRQF_DISABLED,
+                "rtc 1Hz", dev);
         if (ret) {
-                dev_err(dev, "IRQ %d already in use.\n", sa1100_rtc->irq_1Hz);
+                dev_err(dev, "IRQ %d already in use.\n", IRQ_RTC1Hz);
                 goto fail_ui;
         }
-        ret = request_irq(sa1100_rtc->irq_Alrm, sa1100_rtc_interrupt,
-                                IRQF_DISABLED, "rtc Alrm", dev);
+        ret = request_irq(IRQ_RTCAlrm, sa1100_rtc_interrupt, IRQF_DISABLED,
+                "rtc Alrm", dev);
         if (ret) {
-                dev_err(dev, "IRQ %d already in use.\n", sa1100_rtc->irq_Alrm);
+                dev_err(dev, "IRQ %d already in use.\n", IRQ_RTCAlrm);
                 goto fail_ai;
         }
-        sa1100_rtc->rtc->max_user_freq = RTC_FREQ;
-        rtc_irq_set_freq(sa1100_rtc->rtc, NULL, RTC_FREQ);
+        rtc->max_user_freq = RTC_FREQ;
+        rtc_irq_set_freq(rtc, NULL, RTC_FREQ);
 
         return 0;
 
  fail_ai:
-        free_irq(sa1100_rtc->irq_1Hz, dev);
+        free_irq(IRQ_RTC1Hz, dev);
  fail_ui:
         return ret;
 }
 
 static void sa1100_rtc_release(struct device *dev)
 {
-        struct sa1100_rtc *sa1100_rtc = dev_get_drvdata(dev);
-
-        spin_lock_irq(&sa1100_rtc->lock);
-        rtc_writel(sa1100_rtc, RTSR, 0);
-        spin_unlock_irq(&sa1100_rtc->lock);
+        spin_lock_irq(&sa1100_rtc_lock);
+        RTSR = 0;
+        spin_unlock_irq(&sa1100_rtc_lock);
 
-        free_irq(sa1100_rtc->irq_Alrm, dev);
-        free_irq(sa1100_rtc->irq_1Hz, dev);
+        free_irq(IRQ_RTCAlrm, dev);
+        free_irq(IRQ_RTC1Hz, dev);
 }
 
 static int sa1100_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
 {
-        struct sa1100_rtc *sa1100_rtc = dev_get_drvdata(dev);
-        unsigned int rtsr;
-
-        spin_lock_irq(&sa1100_rtc->lock);
-
-        rtsr = rtc_readl(sa1100_rtc, RTSR);
+        spin_lock_irq(&sa1100_rtc_lock);
         if (enabled)
-                rtsr |= RTSR_ALE;
+                RTSR |= RTSR_ALE;
         else
-                rtsr &= ~RTSR_ALE;
-        rtc_writel(sa1100_rtc, RTSR, rtsr);
-
-        spin_unlock_irq(&sa1100_rtc->lock);
+                RTSR &= ~RTSR_ALE;
+        spin_unlock_irq(&sa1100_rtc_lock);
         return 0;
 }
 
 static int sa1100_rtc_read_time(struct device *dev, struct rtc_time *tm)
 {
-        struct sa1100_rtc *sa1100_rtc = dev_get_drvdata(dev);
-
-        rtc_time_to_tm(rtc_readl(sa1100_rtc, RCNR), tm);
+        rtc_time_to_tm(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)
-                rtc_writel(sa1100_rtc, RCNR, time);
+                RCNR = time;
         return ret;
 }
 
 static int sa1100_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 {
-        struct sa1100_rtc *sa1100_rtc = dev_get_drvdata(dev);
-        unsigned long time;
-        unsigned int rtsr;
+        u32     rtsr;
 
-        time = rtc_readl(sa1100_rtc, RCNR);
-        rtc_time_to_tm(time, &alrm->time);
-        rtsr = rtc_readl(sa1100_rtc, RTSR);
+        memcpy(&alrm->time, &rtc_alarm, sizeof(struct rtc_time));
+        rtsr = RTSR;
         alrm->enabled = (rtsr & RTSR_ALE) ? 1 : 0;
         alrm->pending = (rtsr & RTSR_AL) ? 1 : 0;
         return 0;
@@ -233,39 +234,26 @@ 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;
-        unsigned long time, alarm;
-        unsigned int rtsr;
-
-        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);
-
-        rtsr = rtc_readl(sa1100_rtc, RTSR);
-        if (alrm->enabled)
-                rtsr |= RTSR_ALE;
-        else
-                rtsr &= ~RTSR_ALE;
-        rtc_writel(sa1100_rtc, RTSR, rtsr);
+        int ret;
 
-        spin_unlock_irq(&sa1100_rtc->lock);
+        spin_lock_irq(&sa1100_rtc_lock);
+        ret = rtc_update_alarm(&alrm->time);
+        if (ret == 0) {
+                if (alrm->enabled)
+                        RTSR |= RTSR_ALE;
+                else
+                        RTSR &= ~RTSR_ALE;
+        }
+        spin_unlock_irq(&sa1100_rtc_lock);
 
-        return 0;
+        return ret;
 }
 
 static int sa1100_rtc_proc(struct device *dev, struct seq_file *seq)
 {
-        struct sa1100_rtc *sa1100_rtc = dev_get_drvdata(dev);
+        seq_printf(seq, "trim/divider\t\t: 0x%08x\n", (u32) RTTR);
+        seq_printf(seq, "RTSR\t\t\t: 0x%08x\n", (u32)RTSR);
 
-        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;
 }
 
@@ -282,51 +270,7 @@ static const struct rtc_class_ops sa1100_rtc_ops = {
 
 static int sa1100_rtc_probe(struct platform_device *pdev)
 {
-        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);
+        struct rtc_device *rtc;
 
         /*
          * According to the manual we should be able to let RTTR be zero
@@ -335,24 +279,24 @@ 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 (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");
+        if (RTTR == 0) {
+                RTTR = RTC_DEF_DIVIDER + (RTC_DEF_TRIM << 16);
+                dev_warn(&pdev->dev, "warning: "
+                        "initializing default clock divider/trim value\n");
                 /* The current RTC value probably doesn't make sense either */
-                rtc_writel(sa1100_rtc, RCNR, 0);
+                RCNR = 0;
         }
 
         device_init_wakeup(&pdev->dev, 1);
 
-        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;
-        }
+        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);
+
         /* Fix for a nasty initialization problem the in SA11xx RTSR register.
          * See also the comments in sa1100_rtc_interrupt().
          *
@@ -375,46 +319,33 @@ 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. */
-        rtc_writel(sa1100_rtc, RTSR, (RTSR_AL | RTSR_HZ));
+        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 sa1100_rtc *sa1100_rtc = platform_get_drvdata(pdev);
+        struct rtc_device *rtc = platform_get_drvdata(pdev);
+
+        if (rtc)
+                rtc_device_unregister(rtc);
 
-        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(sa1100_rtc->irq_Alrm);
+                enable_irq_wake(IRQ_RTCAlrm);
         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(sa1100_rtc->irq_Alrm);
+                disable_irq_wake(IRQ_RTCAlrm);
         return 0;
 }