Linux-libre 4.3.2-gnu

1 files changed, 84 insertions, 55 deletions

diff --git a/drivers/rtc/rtc-sa1100.c b/drivers/rtc/rtc-sa1100.c
index b6e1ca08c..c2187bf6c 100644
--- a/drivers/rtc/rtc-sa1100.c
+++ b/drivers/rtc/rtc-sa1100.c
@@ -35,24 +35,17 @@
 #include <linux/bitops.h>
 #include <linux/io.h>
 
-#include <mach/hardware.h>
-#include <mach/irqs.h>
+#define RTSR_HZE		BIT(3)	/* HZ interrupt enable */
+#define RTSR_ALE		BIT(2)	/* RTC alarm interrupt enable */
+#define RTSR_HZ			BIT(1)	/* HZ rising-edge detected */
+#define RTSR_AL			BIT(0)	/* RTC alarm detected */
 
-#if defined(CONFIG_ARCH_PXA) || defined(CONFIG_ARCH_MMP)
-#include <mach/regs-rtc.h>
-#endif
+#include "rtc-sa1100.h"
 
 #define RTC_DEF_DIVIDER		(32768 - 1)
 #define RTC_DEF_TRIM		0
 #define RTC_FREQ		1024
 
-struct sa1100_rtc {
-	spinlock_t		lock;
-	int			irq_1hz;
-	int			irq_alarm;
-	struct rtc_device	*rtc;
-	struct clk		*clk;
-};
 
 static irqreturn_t sa1100_rtc_interrupt(int irq, void *dev_id)
 {
@@ -63,16 +56,16 @@ static irqreturn_t sa1100_rtc_interrupt(int irq, void *dev_id)
 
 	spin_lock(&info->lock);
 
-	rtsr = RTSR;
+	rtsr = readl_relaxed(info->rtsr);
 	/* clear interrupt sources */
-	RTSR = 0;
+	writel_relaxed(0, info->rtsr);
 	/* 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);
+		writel_relaxed((RTSR_AL | RTSR_HZ) & (rtsr >> 2), info->rtsr);
 	} else {
 		/* For some reason, it is possible to enter this routine
 		 * without interruptions enabled, it has been tested with
@@ -81,13 +74,13 @@ 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;
+		writel_relaxed(RTSR_AL | RTSR_HZ, info->rtsr);
 	}
 
 	/* clear alarm interrupt if it has occurred */
 	if (rtsr & RTSR_AL)
 		rtsr &= ~RTSR_ALE;
-	RTSR = rtsr & (RTSR_ALE | RTSR_HZE);
+	writel_relaxed(rtsr & (RTSR_ALE | RTSR_HZE), info->rtsr);
 
 	/* update irq data & counter */
 	if (rtsr & RTSR_AL)
@@ -135,7 +128,7 @@ static void sa1100_rtc_release(struct device *dev)
 	struct sa1100_rtc *info = dev_get_drvdata(dev);
 
 	spin_lock_irq(&info->lock);
-	RTSR = 0;
+	writel_relaxed(0, info->rtsr);
 	spin_unlock_irq(&info->lock);
 
 	free_irq(info->irq_alarm, dev);
@@ -144,39 +137,46 @@ static void sa1100_rtc_release(struct device *dev)
 
 static int sa1100_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
 {
+	u32 rtsr;
 	struct sa1100_rtc *info = dev_get_drvdata(dev);
 
 	spin_lock_irq(&info->lock);
+	rtsr = readl_relaxed(info->rtsr);
 	if (enabled)
-		RTSR |= RTSR_ALE;
+		rtsr |= RTSR_ALE;
 	else
-		RTSR &= ~RTSR_ALE;
+		rtsr &= ~RTSR_ALE;
+	writel_relaxed(rtsr, info->rtsr);
 	spin_unlock_irq(&info->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 *info = dev_get_drvdata(dev);
+
+	rtc_time_to_tm(readl_relaxed(info->rcnr), tm);
 	return 0;
 }
 
 static int sa1100_rtc_set_time(struct device *dev, struct rtc_time *tm)
 {
+	struct sa1100_rtc *info = dev_get_drvdata(dev);
 	unsigned long time;
 	int ret;
 
 	ret = rtc_tm_to_time(tm, &time);
 	if (ret == 0)
-		RCNR = time;
+		writel_relaxed(time, info->rcnr);
 	return ret;
 }
 
 static int sa1100_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 {
 	u32	rtsr;
+	struct sa1100_rtc *info = dev_get_drvdata(dev);
 
-	rtsr = RTSR;
+	rtsr = readl_relaxed(info->rtsr);
 	alrm->enabled = (rtsr & RTSR_ALE) ? 1 : 0;
 	alrm->pending = (rtsr & RTSR_AL) ? 1 : 0;
 	return 0;
@@ -192,12 +192,13 @@ static int sa1100_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 	ret = rtc_tm_to_time(&alrm->time, &time);
 	if (ret != 0)
 		goto out;
-	RTSR = RTSR & (RTSR_HZE|RTSR_ALE|RTSR_AL);
-	RTAR = time;
+	writel_relaxed(readl_relaxed(info->rtsr) &
+		(RTSR_HZE | RTSR_ALE | RTSR_AL), info->rtsr);
+	writel_relaxed(time, info->rtar);
 	if (alrm->enabled)
-		RTSR |= RTSR_ALE;
+		writel_relaxed(readl_relaxed(info->rtsr) | RTSR_ALE, info->rtsr);
 	else
-		RTSR &= ~RTSR_ALE;
+		writel_relaxed(readl_relaxed(info->rtsr) & ~RTSR_ALE, info->rtsr);
 out:
 	spin_unlock_irq(&info->lock);
 
@@ -206,8 +207,10 @@ out:
 
 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 *info = dev_get_drvdata(dev);
+
+	seq_printf(seq, "trim/divider\t\t: 0x%08x\n", readl_relaxed(info->rttr));
+	seq_printf(seq, "RTSR\t\t\t: 0x%08x\n", readl_relaxed(info->rtsr));
 
 	return 0;
 }
@@ -223,29 +226,18 @@ static const struct rtc_class_ops sa1100_rtc_ops = {
 	.alarm_irq_enable = sa1100_rtc_alarm_irq_enable,
 };
 
-static int sa1100_rtc_probe(struct platform_device *pdev)
+int sa1100_rtc_init(struct platform_device *pdev, struct sa1100_rtc *info)
 {
 	struct rtc_device *rtc;
-	struct sa1100_rtc *info;
-	int irq_1hz, irq_alarm, ret = 0;
+	int ret;
 
-	irq_1hz = platform_get_irq_byname(pdev, "rtc 1Hz");
-	irq_alarm = platform_get_irq_byname(pdev, "rtc alarm");
-	if (irq_1hz < 0 || irq_alarm < 0)
-		return -ENODEV;
+	spin_lock_init(&info->lock);
 
-	info = devm_kzalloc(&pdev->dev, sizeof(struct sa1100_rtc), GFP_KERNEL);
-	if (!info)
-		return -ENOMEM;
 	info->clk = devm_clk_get(&pdev->dev, NULL);
 	if (IS_ERR(info->clk)) {
 		dev_err(&pdev->dev, "failed to find rtc clock source\n");
 		return PTR_ERR(info->clk);
 	}
-	info->irq_1hz = irq_1hz;
-	info->irq_alarm = irq_alarm;
-	spin_lock_init(&info->lock);
-	platform_set_drvdata(pdev, info);
 
 	ret = clk_prepare_enable(info->clk);
 	if (ret)
@@ -257,22 +249,19 @@ 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);
+	if (readl_relaxed(info->rttr) == 0) {
+		writel_relaxed(RTC_DEF_DIVIDER + (RTC_DEF_TRIM << 16), info->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;
+		writel_relaxed(0, info->rcnr);
 	}
 
-	device_init_wakeup(&pdev->dev, 1);
-
 	rtc = devm_rtc_device_register(&pdev->dev, pdev->name, &sa1100_rtc_ops,
 					THIS_MODULE);
-
 	if (IS_ERR(rtc)) {
-		ret = PTR_ERR(rtc);
-		goto err_dev;
+		clk_disable_unprepare(info->clk);
+		return PTR_ERR(rtc);
 	}
 	info->rtc = rtc;
 
@@ -298,12 +287,52 @@ 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;
+	writel_relaxed(RTSR_AL | RTSR_HZ, info->rtsr);
 
 	return 0;
-err_dev:
-	clk_disable_unprepare(info->clk);
-	return ret;
+}
+EXPORT_SYMBOL_GPL(sa1100_rtc_init);
+
+static int sa1100_rtc_probe(struct platform_device *pdev)
+{
+	struct sa1100_rtc *info;
+	struct resource *iores;
+	void __iomem *base;
+	int irq_1hz, irq_alarm;
+
+	irq_1hz = platform_get_irq_byname(pdev, "rtc 1Hz");
+	irq_alarm = platform_get_irq_byname(pdev, "rtc alarm");
+	if (irq_1hz < 0 || irq_alarm < 0)
+		return -ENODEV;
+
+	info = devm_kzalloc(&pdev->dev, sizeof(struct sa1100_rtc), GFP_KERNEL);
+	if (!info)
+		return -ENOMEM;
+	info->irq_1hz = irq_1hz;
+	info->irq_alarm = irq_alarm;
+
+	iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	base = devm_ioremap_resource(&pdev->dev, iores);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	if (IS_ENABLED(CONFIG_ARCH_SA1100) ||
+	    of_device_is_compatible(pdev->dev.of_node, "mrvl,sa1100-rtc")) {
+		info->rcnr = base + 0x04;
+		info->rtsr = base + 0x10;
+		info->rtar = base + 0x00;
+		info->rttr = base + 0x08;
+	} else {
+		info->rcnr = base + 0x0;
+		info->rtsr = base + 0x8;
+		info->rtar = base + 0x4;
+		info->rttr = base + 0xc;
+	}
+
+	platform_set_drvdata(pdev, info);
+	device_init_wakeup(&pdev->dev, 1);
+
+	return sa1100_rtc_init(pdev, info);
 }
 
 static int sa1100_rtc_remove(struct platform_device *pdev)