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authorLinus Torvalds <torvalds@linux-foundation.org>2012-03-28 01:41:24 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2012-03-28 01:41:24 +0200
commit34800598b2eebe061445216473b1e4c2ff5cba99 (patch)
treea6d0eb6fe45d9480888d7ddb34840e172ed80e56 /drivers/rtc/rtc-sa1100.c
parentMerge tag 'rpmsg' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc (diff)
parentMerge tag 'regulator-3.4' of git://git.kernel.org/pub/scm/linux/kernel/git/br... (diff)
downloadlinux-34800598b2eebe061445216473b1e4c2ff5cba99.tar.xz
linux-34800598b2eebe061445216473b1e4c2ff5cba99.zip
Merge tag 'drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Pull "ARM: driver specific updates" from Arnd Bergmann: "These are all specific to some driver. They are typically the platform side of a change in the drivers directory, such as adding a new driver or extending the interface to the platform. In cases where there is no maintainer for the driver, or the maintainer prefers to have the platform changes in the same branch as the driver changes, the patches to the drivers are included as well. A much smaller set of driver updates that depend on other branches getting merged first will be sent later. The new export of tegra_chip_uid conflicts with other changes in fuse.c. In rtc-sa1100.c, the global removal of IRQF_DISABLED conflicts with the cleanup of the interrupt handling of that driver. Signed-off-by: Arnd Bergmann <arnd@arndb.de>" Fixed up aforementioned trivial conflicts. * tag 'drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (94 commits) ARM: SAMSUNG: change the name from s3c-sdhci to exynos4-sdhci mmc: sdhci-s3c: add platform data for the second capability ARM: SAMSUNG: support the second capability for samsung-soc ARM: EXYNOS: add support DMA for EXYNOS4X12 SoC ARM: EXYNOS: Add apb_pclk clkdev entry for mdma1 ARM: EXYNOS: Enable MDMA driver regulator: Remove bq24022 regulator driver rtc: sa1100: add OF support pxa: magician/hx4700: Convert to gpio-regulator from bq24022 ARM: OMAP3+: SmartReflex: fix error handling ARM: OMAP3+: SmartReflex: fix the use of debugfs_create_* API ARM: OMAP3+: SmartReflex: micro-optimization for sanity check ARM: OMAP3+: SmartReflex: misc cleanups ARM: OMAP3+: SmartReflex: move late_initcall() closer to its argument ARM: OMAP3+: SmartReflex: add missing platform_set_drvdata() ARM: OMAP3+: hwmod: add SmartReflex IRQs ARM: OMAP3+: SmartReflex: clear ERRCONFIG_VPBOUNDINTST only on a need ARM: OMAP3+: SmartReflex: Fix status masking in ERRCONFIG register ARM: OMAP3+: SmartReflex: Add a shutdown hook ARM: OMAP3+: SmartReflex Class3: disable errorgen before disable VP ... Conflicts: arch/arm/mach-tegra/Makefile arch/arm/mach-tegra/fuse.c drivers/rtc/rtc-sa1100.c
Diffstat (limited to 'drivers/rtc/rtc-sa1100.c')
-rw-r--r--drivers/rtc/rtc-sa1100.c127
1 files changed, 94 insertions, 33 deletions
diff --git a/drivers/rtc/rtc-sa1100.c b/drivers/rtc/rtc-sa1100.c
index 44cd81c72ea1..fa512ed42017 100644
--- a/drivers/rtc/rtc-sa1100.c
+++ b/drivers/rtc/rtc-sa1100.c
@@ -23,35 +23,44 @@
#include <linux/platform_device.h>
#include <linux/module.h>
+#include <linux/clk.h>
#include <linux/rtc.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/interrupt.h>
+#include <linux/slab.h>
#include <linux/string.h>
+#include <linux/of.h>
#include <linux/pm.h>
#include <linux/bitops.h>
#include <mach/hardware.h>
#include <asm/irq.h>
-#ifdef CONFIG_ARCH_PXA
+#if defined(CONFIG_ARCH_PXA) || defined(CONFIG_ARCH_MMP)
#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 DEFINE_SPINLOCK(sa1100_rtc_lock);
+#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)
{
- struct platform_device *pdev = to_platform_device(dev_id);
- struct rtc_device *rtc = platform_get_drvdata(pdev);
+ struct sa1100_rtc *info = dev_get_drvdata(dev_id);
+ struct rtc_device *rtc = info->rtc;
unsigned int rtsr;
unsigned long events = 0;
- spin_lock(&sa1100_rtc_lock);
+ spin_lock(&info->lock);
rtsr = RTSR;
/* clear interrupt sources */
@@ -87,26 +96,28 @@ static irqreturn_t sa1100_rtc_interrupt(int irq, void *dev_id)
rtc_update_irq(rtc, 1, events);
- spin_unlock(&sa1100_rtc_lock);
+ spin_unlock(&info->lock);
return IRQ_HANDLED;
}
static int sa1100_rtc_open(struct device *dev)
{
+ struct sa1100_rtc *info = dev_get_drvdata(dev);
+ struct rtc_device *rtc = info->rtc;
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, 0, "rtc 1Hz", dev);
+ ret = clk_prepare_enable(info->clk);
+ if (ret)
+ goto fail_clk;
+ ret = request_irq(info->irq_1hz, sa1100_rtc_interrupt, 0, "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", info->irq_1hz);
goto fail_ui;
}
- ret = request_irq(IRQ_RTCAlrm, sa1100_rtc_interrupt, 0,
- "rtc Alrm", dev);
+ ret = request_irq(info->irq_alarm, sa1100_rtc_interrupt, 0, "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", info->irq_alarm);
goto fail_ai;
}
rtc->max_user_freq = RTC_FREQ;
@@ -115,29 +126,36 @@ static int sa1100_rtc_open(struct device *dev)
return 0;
fail_ai:
- free_irq(IRQ_RTC1Hz, dev);
+ free_irq(info->irq_1hz, dev);
fail_ui:
+ clk_disable_unprepare(info->clk);
+ fail_clk:
return ret;
}
static void sa1100_rtc_release(struct device *dev)
{
- spin_lock_irq(&sa1100_rtc_lock);
+ struct sa1100_rtc *info = dev_get_drvdata(dev);
+
+ spin_lock_irq(&info->lock);
RTSR = 0;
- spin_unlock_irq(&sa1100_rtc_lock);
+ spin_unlock_irq(&info->lock);
- free_irq(IRQ_RTCAlrm, dev);
- free_irq(IRQ_RTC1Hz, dev);
+ free_irq(info->irq_alarm, dev);
+ free_irq(info->irq_1hz, dev);
+ clk_disable_unprepare(info->clk);
}
static int sa1100_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
- spin_lock_irq(&sa1100_rtc_lock);
+ struct sa1100_rtc *info = dev_get_drvdata(dev);
+
+ spin_lock_irq(&info->lock);
if (enabled)
RTSR |= RTSR_ALE;
else
RTSR &= ~RTSR_ALE;
- spin_unlock_irq(&sa1100_rtc_lock);
+ spin_unlock_irq(&info->lock);
return 0;
}
@@ -170,10 +188,11 @@ 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 *info = dev_get_drvdata(dev);
unsigned long time;
int ret;
- spin_lock_irq(&sa1100_rtc_lock);
+ spin_lock_irq(&info->lock);
ret = rtc_tm_to_time(&alrm->time, &time);
if (ret != 0)
goto out;
@@ -184,7 +203,7 @@ static int sa1100_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
else
RTSR &= ~RTSR_ALE;
out:
- spin_unlock_irq(&sa1100_rtc_lock);
+ spin_unlock_irq(&info->lock);
return ret;
}
@@ -211,6 +230,27 @@ 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 *info;
+ int irq_1hz, irq_alarm, ret = 0;
+
+ 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 = kzalloc(sizeof(struct sa1100_rtc), GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+ info->clk = clk_get(&pdev->dev, NULL);
+ if (IS_ERR(info->clk)) {
+ dev_err(&pdev->dev, "failed to find rtc clock source\n");
+ ret = PTR_ERR(info->clk);
+ goto err_clk;
+ }
+ info->irq_1hz = irq_1hz;
+ info->irq_alarm = irq_alarm;
+ spin_lock_init(&info->lock);
+ platform_set_drvdata(pdev, info);
/*
* According to the manual we should be able to let RTTR be zero
@@ -232,10 +272,11 @@ static int sa1100_rtc_probe(struct platform_device *pdev)
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);
+ if (IS_ERR(rtc)) {
+ ret = PTR_ERR(rtc);
+ goto err_dev;
+ }
+ info->rtc = rtc;
/* Fix for a nasty initialization problem the in SA11xx RTSR register.
* See also the comments in sa1100_rtc_interrupt().
@@ -262,14 +303,24 @@ static int sa1100_rtc_probe(struct platform_device *pdev)
RTSR = RTSR_AL | RTSR_HZ;
return 0;
+err_dev:
+ platform_set_drvdata(pdev, NULL);
+ clk_put(info->clk);
+err_clk:
+ kfree(info);
+ return ret;
}
static int sa1100_rtc_remove(struct platform_device *pdev)
{
- struct rtc_device *rtc = platform_get_drvdata(pdev);
+ struct sa1100_rtc *info = platform_get_drvdata(pdev);
- if (rtc)
- rtc_device_unregister(rtc);
+ if (info) {
+ rtc_device_unregister(info->rtc);
+ clk_put(info->clk);
+ platform_set_drvdata(pdev, NULL);
+ kfree(info);
+ }
return 0;
}
@@ -277,15 +328,17 @@ static int sa1100_rtc_remove(struct platform_device *pdev)
#ifdef CONFIG_PM
static int sa1100_rtc_suspend(struct device *dev)
{
+ struct sa1100_rtc *info = dev_get_drvdata(dev);
if (device_may_wakeup(dev))
- enable_irq_wake(IRQ_RTCAlrm);
+ enable_irq_wake(info->irq_alarm);
return 0;
}
static int sa1100_rtc_resume(struct device *dev)
{
+ struct sa1100_rtc *info = dev_get_drvdata(dev);
if (device_may_wakeup(dev))
- disable_irq_wake(IRQ_RTCAlrm);
+ disable_irq_wake(info->irq_alarm);
return 0;
}
@@ -295,6 +348,13 @@ static const struct dev_pm_ops sa1100_rtc_pm_ops = {
};
#endif
+static struct of_device_id sa1100_rtc_dt_ids[] = {
+ { .compatible = "mrvl,sa1100-rtc", },
+ { .compatible = "mrvl,mmp-rtc", },
+ {}
+};
+MODULE_DEVICE_TABLE(of, sa1100_rtc_dt_ids);
+
static struct platform_driver sa1100_rtc_driver = {
.probe = sa1100_rtc_probe,
.remove = sa1100_rtc_remove,
@@ -303,6 +363,7 @@ static struct platform_driver sa1100_rtc_driver = {
#ifdef CONFIG_PM
.pm = &sa1100_rtc_pm_ops,
#endif
+ .of_match_table = sa1100_rtc_dt_ids,
},
};