rtc: add rtc-tx4939 driver

Add support for RTC in TX4939 SoC. Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Acked-by: Alessandro Zummo <a.zummo@towertech.it> Cc: David Brownell <david-b@pacbell.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

rtc: add rtc-tx4939 driver
Add support for RTC in TX4939 SoC. Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Acked-by: Alessandro Zummo <a.zummo@towertech.it> Cc: David Brownell <david-b@pacbell.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Atsushi Nemoto · Linus Torvalds
1 parent bbccf83f6c
Showing 3 changed files with 325 additions and 0 deletions Side-by-side Diff
drivers/rtc/Kconfig
drivers/rtc/Makefile
drivers/rtc/rtc-tx4939.c
@@ -705,5 +705,12 @@
 	  If you say Y here you will get support for the RTC found on
 	  Starfire systems.
  
+config RTC_DRV_TX4939
+	tristate "TX4939 SoC"
+	depends on SOC_TX4939
+	help
+	  Driver for the internal RTC (Realtime Clock) module found on
+	  Toshiba TX4939 SoC.
+
 endif # RTC_CLASS
@@ -68,6 +68,7 @@
 obj-$(CONFIG_RTC_DRV_STK17TA8)	+= rtc-stk17ta8.o
 obj-$(CONFIG_RTC_DRV_TEST)	+= rtc-test.o
 obj-$(CONFIG_RTC_DRV_TWL4030)	+= rtc-twl4030.o
+obj-$(CONFIG_RTC_DRV_TX4939)	+= rtc-tx4939.o
 obj-$(CONFIG_RTC_DRV_V3020)	+= rtc-v3020.o
 obj-$(CONFIG_RTC_DRV_VR41XX)	+= rtc-vr41xx.o
 obj-$(CONFIG_RTC_DRV_WM8350)	+= rtc-wm8350.o
+/*
+ * TX4939 internal RTC driver
+ * Based on RBTX49xx patch from CELF patch archive.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * (C) Copyright TOSHIBA CORPORATION 2005-2007
+ */
+#include <linux/rtc.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <asm/txx9/tx4939.h>
+
+struct tx4939rtc_plat_data {
+	struct rtc_device *rtc;
+	struct tx4939_rtc_reg __iomem *rtcreg;
+};
+
+static struct tx4939rtc_plat_data *get_tx4939rtc_plat_data(struct device *dev)
+{
+	return platform_get_drvdata(to_platform_device(dev));
+}
+
+static int tx4939_rtc_cmd(struct tx4939_rtc_reg __iomem *rtcreg, int cmd)
+{
+	int i = 0;
+
+	__raw_writel(cmd, &rtcreg->ctl);
+	/* This might take 30us (next 32.768KHz clock) */
+	while (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_BUSY) {
+		/* timeout on approx. 100us (@ GBUS200MHz) */
+		if (i++ > 200 * 100)
+			return -EBUSY;
+		cpu_relax();
+	}
+	return 0;
+}
+
+static int tx4939_rtc_set_mmss(struct device *dev, unsigned long secs)
+{
+	struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev);
+	struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg;
+	int i, ret;
+	unsigned char buf[6];
+
+	buf[0] = 0;
+	buf[1] = 0;
+	buf[2] = secs;
+	buf[3] = secs >> 8;
+	buf[4] = secs >> 16;
+	buf[5] = secs >> 24;
+	spin_lock_irq(&pdata->rtc->irq_lock);
+	__raw_writel(0, &rtcreg->adr);
+	for (i = 0; i < 6; i++)
+		__raw_writel(buf[i], &rtcreg->dat);
+	ret = tx4939_rtc_cmd(rtcreg,
+			     TX4939_RTCCTL_COMMAND_SETTIME |
+			     (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALME));
+	spin_unlock_irq(&pdata->rtc->irq_lock);
+	return ret;
+}
+
+static int tx4939_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+	struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev);
+	struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg;
+	int i, ret;
+	unsigned long sec;
+	unsigned char buf[6];
+
+	spin_lock_irq(&pdata->rtc->irq_lock);
+	ret = tx4939_rtc_cmd(rtcreg,
+			     TX4939_RTCCTL_COMMAND_GETTIME |
+			     (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALME));
+	if (ret) {
+		spin_unlock_irq(&pdata->rtc->irq_lock);
+		return ret;
+	}
+	__raw_writel(2, &rtcreg->adr);
+	for (i = 2; i < 6; i++)
+		buf[i] = __raw_readl(&rtcreg->dat);
+	spin_unlock_irq(&pdata->rtc->irq_lock);
+	sec = (buf[5] << 24) | (buf[4] << 16) | (buf[3] << 8) | buf[2];
+	rtc_time_to_tm(sec, tm);
+	return rtc_valid_tm(tm);
+}
+
+static int tx4939_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+	struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev);
+	struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg;
+	int i, ret;
+	unsigned long sec;
+	unsigned char buf[6];
+
+	if (alrm->time.tm_sec < 0 ||
+	    alrm->time.tm_min < 0 ||
+	    alrm->time.tm_hour < 0 ||
+	    alrm->time.tm_mday < 0 ||
+	    alrm->time.tm_mon < 0 ||
+	    alrm->time.tm_year < 0)
+		return -EINVAL;
+	rtc_tm_to_time(&alrm->time, &sec);
+	buf[0] = 0;
+	buf[1] = 0;
+	buf[2] = sec;
+	buf[3] = sec >> 8;
+	buf[4] = sec >> 16;
+	buf[5] = sec >> 24;
+	spin_lock_irq(&pdata->rtc->irq_lock);
+	__raw_writel(0, &rtcreg->adr);
+	for (i = 0; i < 6; i++)
+		__raw_writel(buf[i], &rtcreg->dat);
+	ret = tx4939_rtc_cmd(rtcreg, TX4939_RTCCTL_COMMAND_SETALARM |
+			     (alrm->enabled ? TX4939_RTCCTL_ALME : 0));
+	spin_unlock_irq(&pdata->rtc->irq_lock);
+	return ret;
+}
+
+static int tx4939_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+	struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev);
+	struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg;
+	int i, ret;
+	unsigned long sec;
+	unsigned char buf[6];
+	u32 ctl;
+
+	spin_lock_irq(&pdata->rtc->irq_lock);
+	ret = tx4939_rtc_cmd(rtcreg,
+			     TX4939_RTCCTL_COMMAND_GETALARM |
+			     (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALME));
+	if (ret) {
+		spin_unlock_irq(&pdata->rtc->irq_lock);
+		return ret;
+	}
+	__raw_writel(2, &rtcreg->adr);
+	for (i = 2; i < 6; i++)
+		buf[i] = __raw_readl(&rtcreg->dat);
+	ctl = __raw_readl(&rtcreg->ctl);
+	alrm->enabled = (ctl & TX4939_RTCCTL_ALME) ? 1 : 0;
+	alrm->pending = (ctl & TX4939_RTCCTL_ALMD) ? 1 : 0;
+	spin_unlock_irq(&pdata->rtc->irq_lock);
+	sec = (buf[5] << 24) | (buf[4] << 16) | (buf[3] << 8) | buf[2];
+	rtc_time_to_tm(sec, &alrm->time);
+	return rtc_valid_tm(&alrm->time);
+}
+
+static int tx4939_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
+{
+	struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev);
+
+	spin_lock_irq(&pdata->rtc->irq_lock);
+	tx4939_rtc_cmd(pdata->rtcreg,
+		       TX4939_RTCCTL_COMMAND_NOP |
+		       (enabled ? TX4939_RTCCTL_ALME : 0));
+	spin_unlock_irq(&pdata->rtc->irq_lock);
+	return 0;
+}
+
+static irqreturn_t tx4939_rtc_interrupt(int irq, void *dev_id)
+{
+	struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev_id);
+	struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg;
+	unsigned long events = RTC_IRQF;
+
+	spin_lock(&pdata->rtc->irq_lock);
+	if (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALMD) {
+		events |= RTC_AF;
+		tx4939_rtc_cmd(rtcreg, TX4939_RTCCTL_COMMAND_NOP);
+	}
+	spin_unlock(&pdata->rtc->irq_lock);
+	rtc_update_irq(pdata->rtc, 1, events);
+	return IRQ_HANDLED;
+}
+
+static const struct rtc_class_ops tx4939_rtc_ops = {
+	.read_time		= tx4939_rtc_read_time,
+	.read_alarm		= tx4939_rtc_read_alarm,
+	.set_alarm		= tx4939_rtc_set_alarm,
+	.set_mmss		= tx4939_rtc_set_mmss,
+	.alarm_irq_enable	= tx4939_rtc_alarm_irq_enable,
+};
+
+static ssize_t tx4939_rtc_nvram_read(struct kobject *kobj,
+				     struct bin_attribute *bin_attr,
+				     char *buf, loff_t pos, size_t size)
+{
+	struct device *dev = container_of(kobj, struct device, kobj);
+	struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev);
+	struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg;
+	ssize_t count;
+
+	spin_lock_irq(&pdata->rtc->irq_lock);
+	for (count = 0; size > 0 && pos < TX4939_RTC_REG_RAMSIZE;
+	     count++, size--) {
+		__raw_writel(pos++, &rtcreg->adr);
+		*buf++ = __raw_readl(&rtcreg->dat);
+	}
+	spin_unlock_irq(&pdata->rtc->irq_lock);
+	return count;
+}
+
+static ssize_t tx4939_rtc_nvram_write(struct kobject *kobj,
+				      struct bin_attribute *bin_attr,
+				      char *buf, loff_t pos, size_t size)
+{
+	struct device *dev = container_of(kobj, struct device, kobj);
+	struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev);
+	struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg;
+	ssize_t count;
+
+	spin_lock_irq(&pdata->rtc->irq_lock);
+	for (count = 0; size > 0 && pos < TX4939_RTC_REG_RAMSIZE;
+	     count++, size--) {
+		__raw_writel(pos++, &rtcreg->adr);
+		__raw_writel(*buf++, &rtcreg->dat);
+	}
+	spin_unlock_irq(&pdata->rtc->irq_lock);
+	return count;
+}
+
+static struct bin_attribute tx4939_rtc_nvram_attr = {
+	.attr = {
+		.name = "nvram",
+		.mode = S_IRUGO | S_IWUSR,
+	},
+	.size = TX4939_RTC_REG_RAMSIZE,
+	.read = tx4939_rtc_nvram_read,
+	.write = tx4939_rtc_nvram_write,
+};
+
+static int __init tx4939_rtc_probe(struct platform_device *pdev)
+{
+	struct rtc_device *rtc;
+	struct tx4939rtc_plat_data *pdata;
+	struct resource *res;
+	int irq, ret;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -ENODEV;
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return -ENODEV;
+	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata)
+		return -ENOMEM;
+	platform_set_drvdata(pdev, pdata);
+
+	if (!devm_request_mem_region(&pdev->dev, res->start,
+				     resource_size(res), pdev->name))
+		return -EBUSY;
+	pdata->rtcreg = devm_ioremap(&pdev->dev, res->start,
+				     resource_size(res));
+	if (!pdata->rtcreg)
+		return -EBUSY;
+
+	tx4939_rtc_cmd(pdata->rtcreg, TX4939_RTCCTL_COMMAND_NOP);
+	if (devm_request_irq(&pdev->dev, irq, tx4939_rtc_interrupt,
+			     IRQF_DISABLED | IRQF_SHARED,
+			     pdev->name, &pdev->dev) < 0) {
+		return -EBUSY;
+	}
+	rtc = rtc_device_register(pdev->name, &pdev->dev,
+				  &tx4939_rtc_ops, THIS_MODULE);
+	if (IS_ERR(rtc))
+		return PTR_ERR(rtc);
+	pdata->rtc = rtc;
+	ret = sysfs_create_bin_file(&pdev->dev.kobj, &tx4939_rtc_nvram_attr);
+	if (ret)
+		rtc_device_unregister(rtc);
+	return ret;
+}
+
+static int __exit tx4939_rtc_remove(struct platform_device *pdev)
+{
+	struct tx4939rtc_plat_data *pdata = platform_get_drvdata(pdev);
+	struct rtc_device *rtc = pdata->rtc;
+
+	spin_lock_irq(&rtc->irq_lock);
+	tx4939_rtc_cmd(pdata->rtcreg, TX4939_RTCCTL_COMMAND_NOP);
+	spin_unlock_irq(&rtc->irq_lock);
+	sysfs_remove_bin_file(&pdev->dev.kobj, &tx4939_rtc_nvram_attr);
+	rtc_device_unregister(rtc);
+	platform_set_drvdata(pdev, NULL);
+	return 0;
+}
+
+static struct platform_driver tx4939_rtc_driver = {
+	.remove		= __exit_p(tx4939_rtc_remove),
+	.driver		= {
+		.name	= "tx4939rtc",
+		.owner	= THIS_MODULE,
+	},
+};
+
+static int __init tx4939rtc_init(void)
+{
+	return platform_driver_probe(&tx4939_rtc_driver, tx4939_rtc_probe);
+}
+
+static void __exit tx4939rtc_exit(void)
+{
+	platform_driver_unregister(&tx4939_rtc_driver);
+}
+
+module_init(tx4939rtc_init);
+module_exit(tx4939rtc_exit);
+
+MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
+MODULE_DESCRIPTION("TX4939 internal RTC driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:tx4939rtc");
...	...	@@ -705,5 +705,12 @@
705	705	If you say Y here you will get support for the RTC found on
706	706	Starfire systems.
707	707
	708	+config RTC_DRV_TX4939
	709	+ tristate "TX4939 SoC"
	710	+ depends on SOC_TX4939
	711	+ help
	712	+ Driver for the internal RTC (Realtime Clock) module found on
	713	+ Toshiba TX4939 SoC.
	714	+
708	715	endif # RTC_CLASS
...	...	@@ -68,6 +68,7 @@
68	68	obj-$(CONFIG_RTC_DRV_STK17TA8) += rtc-stk17ta8.o
69	69	obj-$(CONFIG_RTC_DRV_TEST) += rtc-test.o
70	70	obj-$(CONFIG_RTC_DRV_TWL4030) += rtc-twl4030.o
	71	+obj-$(CONFIG_RTC_DRV_TX4939) += rtc-tx4939.o
71	72	obj-$(CONFIG_RTC_DRV_V3020) += rtc-v3020.o
72	73	obj-$(CONFIG_RTC_DRV_VR41XX) += rtc-vr41xx.o
73	74	obj-$(CONFIG_RTC_DRV_WM8350) += rtc-wm8350.o
	1	+/*
	2	+ * TX4939 internal RTC driver
	3	+ * Based on RBTX49xx patch from CELF patch archive.
	4	+ *
	5	+ * This file is subject to the terms and conditions of the GNU General Public
	6	+ * License. See the file "COPYING" in the main directory of this archive
	7	+ * for more details.
	8	+ *
	9	+ * (C) Copyright TOSHIBA CORPORATION 2005-2007
	10	+ */
	11	+#include <linux/rtc.h>
	12	+#include <linux/platform_device.h>
	13	+#include <linux/interrupt.h>
	14	+#include <linux/io.h>
	15	+#include <asm/txx9/tx4939.h>
	16	+
	17	+struct tx4939rtc_plat_data {
	18	+ struct rtc_device *rtc;
	19	+ struct tx4939_rtc_reg __iomem *rtcreg;
	20	+};
	21	+
	22	+static struct tx4939rtc_plat_data get_tx4939rtc_plat_data(struct device dev)
	23	+{
	24	+ return platform_get_drvdata(to_platform_device(dev));
	25	+}
	26	+
	27	+static int tx4939_rtc_cmd(struct tx4939_rtc_reg __iomem *rtcreg, int cmd)
	28	+{
	29	+ int i = 0;
	30	+
	31	+ __raw_writel(cmd, &rtcreg->ctl);
	32	+ /* This might take 30us (next 32.768KHz clock) */
	33	+ while (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_BUSY) {
	34	+ /* timeout on approx. 100us (@ GBUS200MHz) */
	35	+ if (i++ > 200 * 100)
	36	+ return -EBUSY;
	37	+ cpu_relax();
	38	+ }
	39	+ return 0;
	40	+}
	41	+
	42	+static int tx4939_rtc_set_mmss(struct device *dev, unsigned long secs)
	43	+{
	44	+ struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev);
	45	+ struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg;
	46	+ int i, ret;
	47	+ unsigned char buf[6];
	48	+
	49	+ buf[0] = 0;
	50	+ buf[1] = 0;
	51	+ buf[2] = secs;
	52	+ buf[3] = secs >> 8;
	53	+ buf[4] = secs >> 16;
	54	+ buf[5] = secs >> 24;
	55	+ spin_lock_irq(&pdata->rtc->irq_lock);
	56	+ __raw_writel(0, &rtcreg->adr);
	57	+ for (i = 0; i < 6; i++)
	58	+ __raw_writel(buf[i], &rtcreg->dat);
	59	+ ret = tx4939_rtc_cmd(rtcreg,
	60	+ TX4939_RTCCTL_COMMAND_SETTIME \|
	61	+ (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALME));
	62	+ spin_unlock_irq(&pdata->rtc->irq_lock);
	63	+ return ret;
	64	+}
	65	+
	66	+static int tx4939_rtc_read_time(struct device dev, struct rtc_time tm)
	67	+{
	68	+ struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev);
	69	+ struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg;
	70	+ int i, ret;
	71	+ unsigned long sec;
	72	+ unsigned char buf[6];
	73	+
	74	+ spin_lock_irq(&pdata->rtc->irq_lock);
	75	+ ret = tx4939_rtc_cmd(rtcreg,
	76	+ TX4939_RTCCTL_COMMAND_GETTIME \|
	77	+ (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALME));
	78	+ if (ret) {
	79	+ spin_unlock_irq(&pdata->rtc->irq_lock);
	80	+ return ret;
	81	+ }
	82	+ __raw_writel(2, &rtcreg->adr);
	83	+ for (i = 2; i < 6; i++)
	84	+ buf[i] = __raw_readl(&rtcreg->dat);
	85	+ spin_unlock_irq(&pdata->rtc->irq_lock);
	86	+ sec = (buf[5] << 24) \| (buf[4] << 16) \| (buf[3] << 8) \| buf[2];
	87	+ rtc_time_to_tm(sec, tm);
	88	+ return rtc_valid_tm(tm);
	89	+}
	90	+
	91	+static int tx4939_rtc_set_alarm(struct device dev, struct rtc_wkalrm alrm)
	92	+{
	93	+ struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev);
	94	+ struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg;
	95	+ int i, ret;
	96	+ unsigned long sec;
	97	+ unsigned char buf[6];
	98	+
	99	+ if (alrm->time.tm_sec < 0 \|\|
	100	+ alrm->time.tm_min < 0 \|\|
	101	+ alrm->time.tm_hour < 0 \|\|
	102	+ alrm->time.tm_mday < 0 \|\|
	103	+ alrm->time.tm_mon < 0 \|\|
	104	+ alrm->time.tm_year < 0)
	105	+ return -EINVAL;
	106	+ rtc_tm_to_time(&alrm->time, &sec);
	107	+ buf[0] = 0;
	108	+ buf[1] = 0;
	109	+ buf[2] = sec;
	110	+ buf[3] = sec >> 8;
	111	+ buf[4] = sec >> 16;
	112	+ buf[5] = sec >> 24;
	113	+ spin_lock_irq(&pdata->rtc->irq_lock);
	114	+ __raw_writel(0, &rtcreg->adr);
	115	+ for (i = 0; i < 6; i++)
	116	+ __raw_writel(buf[i], &rtcreg->dat);
	117	+ ret = tx4939_rtc_cmd(rtcreg, TX4939_RTCCTL_COMMAND_SETALARM \|
	118	+ (alrm->enabled ? TX4939_RTCCTL_ALME : 0));
	119	+ spin_unlock_irq(&pdata->rtc->irq_lock);
	120	+ return ret;
	121	+}
	122	+
	123	+static int tx4939_rtc_read_alarm(struct device dev, struct rtc_wkalrm alrm)
	124	+{
	125	+ struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev);
	126	+ struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg;
	127	+ int i, ret;
	128	+ unsigned long sec;
	129	+ unsigned char buf[6];
	130	+ u32 ctl;
	131	+
	132	+ spin_lock_irq(&pdata->rtc->irq_lock);
	133	+ ret = tx4939_rtc_cmd(rtcreg,
	134	+ TX4939_RTCCTL_COMMAND_GETALARM \|
	135	+ (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALME));
	136	+ if (ret) {
	137	+ spin_unlock_irq(&pdata->rtc->irq_lock);
	138	+ return ret;
	139	+ }
	140	+ __raw_writel(2, &rtcreg->adr);
	141	+ for (i = 2; i < 6; i++)
	142	+ buf[i] = __raw_readl(&rtcreg->dat);
	143	+ ctl = __raw_readl(&rtcreg->ctl);
	144	+ alrm->enabled = (ctl & TX4939_RTCCTL_ALME) ? 1 : 0;
	145	+ alrm->pending = (ctl & TX4939_RTCCTL_ALMD) ? 1 : 0;
	146	+ spin_unlock_irq(&pdata->rtc->irq_lock);
	147	+ sec = (buf[5] << 24) \| (buf[4] << 16) \| (buf[3] << 8) \| buf[2];
	148	+ rtc_time_to_tm(sec, &alrm->time);
	149	+ return rtc_valid_tm(&alrm->time);
	150	+}
	151	+
	152	+static int tx4939_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
	153	+{
	154	+ struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev);
	155	+
	156	+ spin_lock_irq(&pdata->rtc->irq_lock);
	157	+ tx4939_rtc_cmd(pdata->rtcreg,
	158	+ TX4939_RTCCTL_COMMAND_NOP \|
	159	+ (enabled ? TX4939_RTCCTL_ALME : 0));
	160	+ spin_unlock_irq(&pdata->rtc->irq_lock);
	161	+ return 0;
	162	+}
	163	+
	164	+static irqreturn_t tx4939_rtc_interrupt(int irq, void *dev_id)
	165	+{
	166	+ struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev_id);
	167	+ struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg;
	168	+ unsigned long events = RTC_IRQF;
	169	+
	170	+ spin_lock(&pdata->rtc->irq_lock);
	171	+ if (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALMD) {
	172	+ events \|= RTC_AF;
	173	+ tx4939_rtc_cmd(rtcreg, TX4939_RTCCTL_COMMAND_NOP);
	174	+ }
	175	+ spin_unlock(&pdata->rtc->irq_lock);
	176	+ rtc_update_irq(pdata->rtc, 1, events);
	177	+ return IRQ_HANDLED;
	178	+}
	179	+
	180	+static const struct rtc_class_ops tx4939_rtc_ops = {
	181	+ .read_time = tx4939_rtc_read_time,
	182	+ .read_alarm = tx4939_rtc_read_alarm,
	183	+ .set_alarm = tx4939_rtc_set_alarm,
	184	+ .set_mmss = tx4939_rtc_set_mmss,
	185	+ .alarm_irq_enable = tx4939_rtc_alarm_irq_enable,
	186	+};
	187	+
	188	+static ssize_t tx4939_rtc_nvram_read(struct kobject *kobj,
	189	+ struct bin_attribute *bin_attr,
	190	+ char *buf, loff_t pos, size_t size)
	191	+{
	192	+ struct device *dev = container_of(kobj, struct device, kobj);
	193	+ struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev);
	194	+ struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg;
	195	+ ssize_t count;
	196	+
	197	+ spin_lock_irq(&pdata->rtc->irq_lock);
	198	+ for (count = 0; size > 0 && pos < TX4939_RTC_REG_RAMSIZE;
	199	+ count++, size--) {
	200	+ __raw_writel(pos++, &rtcreg->adr);
	201	+ *buf++ = __raw_readl(&rtcreg->dat);
	202	+ }
	203	+ spin_unlock_irq(&pdata->rtc->irq_lock);
	204	+ return count;
	205	+}
	206	+
	207	+static ssize_t tx4939_rtc_nvram_write(struct kobject *kobj,
	208	+ struct bin_attribute *bin_attr,
	209	+ char *buf, loff_t pos, size_t size)
	210	+{
	211	+ struct device *dev = container_of(kobj, struct device, kobj);
	212	+ struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev);
	213	+ struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg;
	214	+ ssize_t count;
	215	+
	216	+ spin_lock_irq(&pdata->rtc->irq_lock);
	217	+ for (count = 0; size > 0 && pos < TX4939_RTC_REG_RAMSIZE;
	218	+ count++, size--) {
	219	+ __raw_writel(pos++, &rtcreg->adr);
	220	+ __raw_writel(*buf++, &rtcreg->dat);
	221	+ }
	222	+ spin_unlock_irq(&pdata->rtc->irq_lock);
	223	+ return count;
	224	+}
	225	+
	226	+static struct bin_attribute tx4939_rtc_nvram_attr = {
	227	+ .attr = {
	228	+ .name = "nvram",
	229	+ .mode = S_IRUGO \| S_IWUSR,
	230	+ },
	231	+ .size = TX4939_RTC_REG_RAMSIZE,
	232	+ .read = tx4939_rtc_nvram_read,
	233	+ .write = tx4939_rtc_nvram_write,
	234	+};
	235	+
	236	+static int __init tx4939_rtc_probe(struct platform_device *pdev)
	237	+{
	238	+ struct rtc_device *rtc;
	239	+ struct tx4939rtc_plat_data *pdata;
	240	+ struct resource *res;
	241	+ int irq, ret;
	242	+
	243	+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	244	+ if (!res)
	245	+ return -ENODEV;
	246	+ irq = platform_get_irq(pdev, 0);
	247	+ if (irq < 0)
	248	+ return -ENODEV;
	249	+ pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
	250	+ if (!pdata)
	251	+ return -ENOMEM;
	252	+ platform_set_drvdata(pdev, pdata);
	253	+
	254	+ if (!devm_request_mem_region(&pdev->dev, res->start,
	255	+ resource_size(res), pdev->name))
	256	+ return -EBUSY;
	257	+ pdata->rtcreg = devm_ioremap(&pdev->dev, res->start,
	258	+ resource_size(res));
	259	+ if (!pdata->rtcreg)
	260	+ return -EBUSY;
	261	+
	262	+ tx4939_rtc_cmd(pdata->rtcreg, TX4939_RTCCTL_COMMAND_NOP);
	263	+ if (devm_request_irq(&pdev->dev, irq, tx4939_rtc_interrupt,
	264	+ IRQF_DISABLED \| IRQF_SHARED,
	265	+ pdev->name, &pdev->dev) < 0) {
	266	+ return -EBUSY;
	267	+ }
	268	+ rtc = rtc_device_register(pdev->name, &pdev->dev,
	269	+ &tx4939_rtc_ops, THIS_MODULE);
	270	+ if (IS_ERR(rtc))
	271	+ return PTR_ERR(rtc);
	272	+ pdata->rtc = rtc;
	273	+ ret = sysfs_create_bin_file(&pdev->dev.kobj, &tx4939_rtc_nvram_attr);
	274	+ if (ret)
	275	+ rtc_device_unregister(rtc);
	276	+ return ret;
	277	+}
	278	+
	279	+static int __exit tx4939_rtc_remove(struct platform_device *pdev)
	280	+{
	281	+ struct tx4939rtc_plat_data *pdata = platform_get_drvdata(pdev);
	282	+ struct rtc_device *rtc = pdata->rtc;
	283	+
	284	+ spin_lock_irq(&rtc->irq_lock);
	285	+ tx4939_rtc_cmd(pdata->rtcreg, TX4939_RTCCTL_COMMAND_NOP);
	286	+ spin_unlock_irq(&rtc->irq_lock);
	287	+ sysfs_remove_bin_file(&pdev->dev.kobj, &tx4939_rtc_nvram_attr);
	288	+ rtc_device_unregister(rtc);
	289	+ platform_set_drvdata(pdev, NULL);
	290	+ return 0;
	291	+}
	292	+
	293	+static struct platform_driver tx4939_rtc_driver = {
	294	+ .remove = __exit_p(tx4939_rtc_remove),
	295	+ .driver = {
	296	+ .name = "tx4939rtc",
	297	+ .owner = THIS_MODULE,
	298	+ },
	299	+};
	300	+
	301	+static int __init tx4939rtc_init(void)
	302	+{
	303	+ return platform_driver_probe(&tx4939_rtc_driver, tx4939_rtc_probe);
	304	+}
	305	+
	306	+static void __exit tx4939rtc_exit(void)
	307	+{
	308	+ platform_driver_unregister(&tx4939_rtc_driver);
	309	+}
	310	+
	311	+module_init(tx4939rtc_init);
	312	+module_exit(tx4939rtc_exit);
	313	+
	314	+MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
	315	+MODULE_DESCRIPTION("TX4939 internal RTC driver");
	316	+MODULE_LICENSE("GPL");
	317	+MODULE_ALIAS("platform:tx4939rtc");