diff --git a/arch/arm/mach-spear13xx/clock.c b/arch/arm/mach-spear13xx/clock.c
index cef3b13..cc692cc 100644
--- a/arch/arm/mach-spear13xx/clock.c
+++ b/arch/arm/mach-spear13xx/clock.c

@@ -736,7 +736,7 @@ static struct clk_lookup spear_clk_lookups[] = {

? ? ? ?{.con_id = "osc3_25m_clk", ? ? ?.clk = &osc3_25m_clk},

? ? ? ?/* clock derived from 32 KHz osc clk */
- ? ? ? {.dev_id = "rtc", ? ? ? ? ? ? ? .clk = &rtc_clk},
+ ? ? ? {.dev_id = "rtc-spear", ? ? ? ? .clk = &rtc_clk},

? ? ? ?/* clock derived from 24/25 MHz osc1/osc3 clk */
? ? ? ?{.con_id = "pll1_clk", ? ? ? ? ?.clk = &pll1_clk},

diff --git a/arch/arm/mach-spear13xx/include/mach/generic.h b/arch/arm/mach-spear13xx/include/mach/generic.h
index 41c1a53..dc80421 100644
--- a/arch/arm/mach-spear13xx/include/mach/generic.h
+++ b/arch/arm/mach-spear13xx/include/mach/generic.h

@@ -30,6 +30,7 @@

?/* Add spear13xx family device structure declarations here */
?extern struct amba_device uart_device;
+extern struct platform_device rtc_device;
?extern struct sys_timer spear13xx_timer;

?/* Add spear1300 machine device structure declarations here */

diff --git a/arch/arm/mach-spear13xx/spear1300_evb.c b/arch/arm/mach-spear13xx/spear1300_evb.c
index d72c8a8..60c5fee 100644
--- a/arch/arm/mach-spear13xx/spear1300_evb.c
+++ b/arch/arm/mach-spear13xx/spear1300_evb.c

@@ -22,6 +22,7 @@ static struct amba_device *amba_devs[] __initdata = {

?};

?static struct platform_device *plat_devs[] __initdata = {
+ ? ? ? &rtc_device,
?};

?static void __init spear1300_evb_init(void)

diff --git a/arch/arm/mach-spear13xx/spear13xx.c b/arch/arm/mach-spear13xx/spear13xx.c
index d11e300..bdca713 100644
--- a/arch/arm/mach-spear13xx/spear13xx.c
+++ b/arch/arm/mach-spear13xx/spear13xx.c

@@ -37,6 +37,25 @@ struct amba_device uart_device = {

? ? ? ?.irq = {IRQ_UART, NO_IRQ},
?};

+/* rtc device registration */
+static struct resource rtc_resources[] = {
+ ? ? ? {
+ ? ? ? ? ? ? ? .start = SPEAR13XX_RTC_BASE,
+ ? ? ? ? ? ? ? .end = SPEAR13XX_RTC_BASE + SZ_4K - 1,
+ ? ? ? ? ? ? ? .flags = IORESOURCE_MEM,
+ ? ? ? }, {
+ ? ? ? ? ? ? ? .start = IRQ_RTC,
+ ? ? ? ? ? ? ? .flags = IORESOURCE_IRQ,
+ ? ? ? },
+};
+
+struct platform_device rtc_device = {
+ ? ? ? .name = "rtc-spear",
+ ? ? ? .id = -1,
+ ? ? ? .num_resources = ARRAY_SIZE(rtc_resources),
+ ? ? ? .resource = rtc_resources,
+};
+
?/* Do spear13xx familiy common initialization part here */
?void __init spear13xx_init(void)
?{

diff --git a/arch/arm/mach-spear3xx/clock.c b/arch/arm/mach-spear3xx/clock.c
index dc19666..147d0a3 100644
--- a/arch/arm/mach-spear3xx/clock.c
+++ b/arch/arm/mach-spear3xx/clock.c

@@ -467,7 +467,7 @@ static struct clk_lookup spear_clk_lookups[] = {

? ? ? ?{ .con_id = "osc_32k_clk", ? ? ?.clk = &osc_32k_clk},
? ? ? ?{ .con_id = "osc_24m_clk", ? ? ?.clk = &osc_24m_clk},
? ? ? ?/* clock derived from 32 KHz osc clk */
- ? ? ? { .dev_id = "rtc", ? ? ? ? ? ? ?.clk = &rtc_clk},
+ ? ? ? { .dev_id = "rtc-spear", ? ? ? ?.clk = &rtc_clk},
? ? ? ?/* clock derived from 24 MHz osc clk */
? ? ? ?{ .con_id = "pll1_clk", ? ? ? ? .clk = &pll1_clk},
? ? ? ?{ .con_id = "pll3_48m_clk", ? ? .clk = &pll3_48m_clk},

diff --git a/arch/arm/mach-spear3xx/include/mach/generic.h b/arch/arm/mach-spear3xx/include/mach/generic.h
index d76ee98..408bb8d 100644
--- a/arch/arm/mach-spear3xx/include/mach/generic.h
+++ b/arch/arm/mach-spear3xx/include/mach/generic.h

@@ -33,6 +33,7 @@

?/* Add spear3xx family device structure declarations here */
?extern struct amba_device gpio_device;
?extern struct amba_device uart_device;
+extern struct platform_device rtc_device;
?extern struct sys_timer spear3xx_timer;

?/* Add spear3xx family function declarations here */

diff --git a/arch/arm/mach-spear3xx/spear300_evb.c b/arch/arm/mach-spear3xx/spear300_evb.c
index 3bb7fbc..392ee4a 100644
--- a/arch/arm/mach-spear3xx/spear300_evb.c
+++ b/arch/arm/mach-spear3xx/spear300_evb.c

@@ -44,6 +44,7 @@ static struct amba_device *amba_devs[] __initdata = {

?static struct platform_device *plat_devs[] __initdata = {
? ? ? ?/* spear3xx specific devices */
+ ? ? ? &rtc_device,

? ? ? ?/* spear300 specific devices */
?};

diff --git a/arch/arm/mach-spear3xx/spear310_evb.c b/arch/arm/mach-spear3xx/spear310_evb.c
index 7dd93bd..15ca8fc 100644
--- a/arch/arm/mach-spear3xx/spear310_evb.c
+++ b/arch/arm/mach-spear3xx/spear310_evb.c

@@ -50,6 +50,7 @@ static struct amba_device *amba_devs[] __initdata = {

?static struct platform_device *plat_devs[] __initdata = {
? ? ? ?/* spear3xx specific devices */
+ ? ? ? &rtc_device,

? ? ? ?/* spear310 specific devices */
? ? ? ?&plgpio_device,

diff --git a/arch/arm/mach-spear3xx/spear320_evb.c b/arch/arm/mach-spear3xx/spear320_evb.c
index 82f4e76..48155cc 100644
--- a/arch/arm/mach-spear3xx/spear320_evb.c
+++ b/arch/arm/mach-spear3xx/spear320_evb.c

@@ -48,6 +48,7 @@ static struct amba_device *amba_devs[] __initdata = {

?static struct platform_device *plat_devs[] __initdata = {
? ? ? ?/* spear3xx specific devices */
+ ? ? ? &rtc_device,

? ? ? ?/* spear320 specific devices */
? ? ? ?&plgpio_device,

diff --git a/arch/arm/mach-spear3xx/spear3xx.c b/arch/arm/mach-spear3xx/spear3xx.c
index 89cf8ea..6d8791e 100644
--- a/arch/arm/mach-spear3xx/spear3xx.c
+++ b/arch/arm/mach-spear3xx/spear3xx.c

@@ -54,6 +54,25 @@ struct amba_device uart_device = {

? ? ? ?.irq = {IRQ_UART, NO_IRQ},
?};

+/* rtc device registration */
+static struct resource rtc_resources[] = {
+ ? ? ? {
+ ? ? ? ? ? ? ? .start = SPEAR3XX_ICM3_RTC_BASE,
+ ? ? ? ? ? ? ? .end = SPEAR3XX_ICM3_RTC_BASE + SZ_4K - 1,
+ ? ? ? ? ? ? ? .flags = IORESOURCE_MEM,
+ ? ? ? }, {
+ ? ? ? ? ? ? ? .start = IRQ_BASIC_RTC,
+ ? ? ? ? ? ? ? .flags = IORESOURCE_IRQ,
+ ? ? ? },
+};
+
+struct platform_device rtc_device = {
+ ? ? ? .name = "rtc-spear",
+ ? ? ? .id = -1,
+ ? ? ? .num_resources = ARRAY_SIZE(rtc_resources),
+ ? ? ? .resource = rtc_resources,
+};
+
?/* Do spear3xx familiy common initialization part here */
?void __init spear3xx_init(void)
?{

diff --git a/arch/arm/mach-spear6xx/clock.c b/arch/arm/mach-spear6xx/clock.c
index 4a91991..66fc622 100644
--- a/arch/arm/mach-spear6xx/clock.c
+++ b/arch/arm/mach-spear6xx/clock.c

@@ -569,7 +569,7 @@ static struct clk_lookup spear_clk_lookups[] = {

? ? ? ?{ .con_id = "osc_32k_clk", ? ? ?.clk = &osc_32k_clk},
? ? ? ?{ .con_id = "osc_30m_clk", ? ? ?.clk = &osc_30m_clk},
? ? ? ?/* clock derived from 32 KHz os ? ? ? ? ?clk */
- ? ? ? { .dev_id = "rtc", ? ? ? ? ? ? ?.clk = &rtc_clk},
+ ? ? ? { .dev_id = "rtc-spear", ? ? ? ?.clk = &rtc_clk},
? ? ? ?/* clock derived from 30 MHz os ? ? ? ? ?clk */
? ? ? ?{ .con_id = "pll1_clk", ? ? ? ? .clk = &pll1_clk},
? ? ? ?{ .con_id = "pll3_48m_clk", ? ? .clk = &pll3_48m_clk},

diff --git a/arch/arm/mach-spear6xx/include/mach/generic.h b/arch/arm/mach-spear6xx/include/mach/generic.h
index d6a04f2..674b16c 100644
--- a/arch/arm/mach-spear6xx/include/mach/generic.h
+++ b/arch/arm/mach-spear6xx/include/mach/generic.h

@@ -32,6 +32,7 @@

?extern struct amba_device clcd_device;
?extern struct amba_device gpio_device[];
?extern struct amba_device uart_device[];
+extern struct platform_device rtc_device;
?extern struct sys_timer spear6xx_timer;

?/* Add spear6xx family function declarations here */

diff --git a/arch/arm/mach-spear6xx/spear600_evb.c b/arch/arm/mach-spear6xx/spear600_evb.c
index 88e69f4..861e83d 100644
--- a/arch/arm/mach-spear6xx/spear600_evb.c
+++ b/arch/arm/mach-spear6xx/spear600_evb.c

@@ -26,6 +26,7 @@ static struct amba_device *amba_devs[] __initdata = {

?};

?static struct platform_device *plat_devs[] __initdata = {
+ ? ? ? &rtc_device,
?};

?static void __init spear600_evb_init(void)

diff --git a/arch/arm/mach-spear6xx/spear6xx.c b/arch/arm/mach-spear6xx/spear6xx.c
index d0f6b9d..1e403cb 100644
--- a/arch/arm/mach-spear6xx/spear6xx.c
+++ b/arch/arm/mach-spear6xx/spear6xx.c

@@ -121,6 +121,25 @@ struct amba_device gpio_device[] = {

? ? ? ?}
?};

+/* rtc device registration */
+static struct resource rtc_resources[] = {
+ ? ? ? {
+ ? ? ? ? ? ? ? .start = SPEAR6XX_ICM3_RTC_BASE,
+ ? ? ? ? ? ? ? .end = SPEAR6XX_ICM3_RTC_BASE + SZ_4K - 1,
+ ? ? ? ? ? ? ? .flags = IORESOURCE_MEM,
+ ? ? ? }, {
+ ? ? ? ? ? ? ? .start = IRQ_BASIC_RTC,
+ ? ? ? ? ? ? ? .flags = IORESOURCE_IRQ,
+ ? ? ? },
+};
+
+struct platform_device rtc_device = {
+ ? ? ? .name = "rtc-spear",
+ ? ? ? .id = -1,
+ ? ? ? .num_resources = ARRAY_SIZE(rtc_resources),
+ ? ? ? .resource = rtc_resources,
+};
+
?/* This will add devices, and do machine specific tasks */
?void __init spear6xx_init(void)
?{

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 48ca713..f099473 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig

@@ -625,6 +625,13 @@ config RTC_DRV_WM8350

? ? ? ? ?This driver can also be built as a module. If so, the module
? ? ? ? ?will be called "rtc-wm8350".

+config RTC_DRV_SPEAR
+ ? ? ? tristate "SPEAR ST RTC"
+ ? ? ? default y
+ ? ? ? help
+ ? ? ? ?If you say Y here you will get support for the RTC found on
+ ? ? ? ?spear
+
?config RTC_DRV_PCF50633
? ? ? ?depends on MFD_PCF50633
? ? ? ?tristate "NXP PCF50633 RTC"

diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 0f207b3..44df01a 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile

@@ -86,6 +86,7 @@ obj-$(CONFIG_RTC_DRV_S35390A) += rtc-s35390a.o

?obj-$(CONFIG_RTC_DRV_S3C) ? ? ?+= rtc-s3c.o
?obj-$(CONFIG_RTC_DRV_SA1100) ? += rtc-sa1100.o
?obj-$(CONFIG_RTC_DRV_SH) ? ? ? += rtc-sh.o
+obj-$(CONFIG_RTC_DRV_SPEAR) ? ?+= rtc-spear.o
?obj-$(CONFIG_RTC_DRV_STARFIRE) += rtc-starfire.o
?obj-$(CONFIG_RTC_DRV_STK17TA8) += rtc-stk17ta8.o
?obj-$(CONFIG_RTC_DRV_STMP) ? ? += rtc-stmp3xxx.o

diff --git a/drivers/rtc/rtc-spear.c b/drivers/rtc/rtc-spear.c
new file mode 100644
index 0000000..5b49124
--- /dev/null
+++ b/drivers/rtc/rtc-spear.c

@@ -0,0 +1,598 @@
+/*
+ * drivers/rtc/rtc-spear.c
+ *
+ * Copyright (C) 2010 ST Microelectronics
+ * Rajeev Kumar<rajeev-dlh.kumar@st.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/bcd.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/rtc.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+#include <linux/wait.h>
+#include <asm/mach/time.h>
+
+/* RTC registers */
+#define TIME_REG ? ? ? ? ? ? ? 0x00
+#define DATE_REG ? ? ? ? ? ? ? 0x04
+#define ALARM_TIME_REG ? ? ? ? 0x08
+#define ALARM_DATE_REG ? ? ? ? 0x0C
+#define CTRL_REG ? ? ? ? ? ? ? 0x10
+#define STATUS_REG ? ? ? ? ? ? 0x14
+
+/* TIME_REG & ALARM_TIME_REG */
+#define SECONDS_UNITS ? ? ? ? ?(0xf<<0) ? ? ? ?/* seconds units position */
+#define SECONDS_TENS ? ? ? ? ? (0x7<<4) ? ? ? ?/* seconds tens position */
+#define MINUTES_UNITS ? ? ? ? ?(0xf<<8) ? ? ? ?/* minutes units position */
+#define MINUTES_TENS ? ? ? ? ? (0x7<<12) ? ? ? /* minutes tens position */
+#define HOURS_UNITS ? ? ? ? ? ?(0xf<<16) ? ? ? /* hours units position */
+#define HOURS_TENS ? ? ? ? ? ? (0x3<<20) ? ? ? /* hours tens position */
+
+/* DATE_REG & ALARM_DATE_REG */
+#define DAYS_UNITS ? ? ? ? ? ? (0xf<<0) ? ? ? ?/* days units position */
+#define DAYS_TENS ? ? ? ? ? ? ?(0x3<<4) ? ? ? ?/* days tens position */
+#define MONTHS_UNITS ? ? ? ? ? (0xf<<8) ? ? ? ?/* months units position */
+#define MONTHS_TENS ? ? ? ? ? ?(0x1<<12) ? ? ? /* months tens position */
+#define YEARS_UNITS ? ? ? ? ? ?(0xf<<16) ? ? ? /* years units position */
+#define YEARS_TENS ? ? ? ? ? ? (0xf<<20) ? ? ? /* years tens position */
+#define YEARS_HUNDREDS ? ? ? ? (0xf<<24) ? ? ? /* years hundereds position */
+#define YEARS_MILLENIUMS ? ? ? (0xf<<28) ? ? ? /* years millenium position */
+
+/* MASK SHIFT TIME_REG & ALARM_TIME_REG*/
+#define SECOND_SHIFT ? ? ? ? ? 0x00 ? ? ? ? ? ?/* seconds units */
+#define MINUTE_SHIFT ? ? ? ? ? 0x08 ? ? ? ? ? ?/* minutes units position */
+#define HOUR_SHIFT ? ? ? ? ? ? 0x10 ? ? ? ? ? ?/* hours units position */
+#define MDAY_SHIFT ? ? ? ? ? ? 0x00 ? ? ? ? ? ?/* Month day shift */
+#define MONTH_SHIFT ? ? ? ? ? ?0x08 ? ? ? ? ? ?/* Month shift */
+#define YEAR_SHIFT ? ? ? ? ? ? 0x10 ? ? ? ? ? ?/* Year shift */
+
+#define SECOND_MASK ? ? ? ? ? ?0x7F
+#define MIN_MASK ? ? ? ? ? ? ? 0x7F
+#define HOUR_MASK ? ? ? ? ? ? ?0x3F
+#define DAY_MASK ? ? ? ? ? ? ? 0x3F
+#define MONTH_MASK ? ? ? ? ? ? 0x7F
+#define YEAR_MASK ? ? ? ? ? ? ?0xFFFF
+
+/* date reg equal to time reg, for debug only */
+#define TIME_BYP ? ? ? ? ? ? ? (1<<9)
+#define INT_ENABLE ? ? ? ? ? ? (1<<31) ? ? ? ? /* interrupt enable */
+
+/* STATUS_REG */
+#define CLK_UNCONNECTED ? ? ? ? ? ? ? ?(1<<0)
+#define PEND_WR_TIME ? ? ? ? ? (1<<2)
+#define PEND_WR_DATE ? ? ? ? ? (1<<3)
+#define LOST_WR_TIME ? ? ? ? ? (1<<4)
+#define LOST_WR_DATE ? ? ? ? ? (1<<5)
+#define RTC_INT_MASK ? ? ? ? ? (1<<31)
+#define STATUS_BUSY ? ? ? ? ? ?(PEND_WR_TIME | PEND_WR_DATE)
+#define STATUS_FAIL ? ? ? ? ? ?(LOST_WR_TIME | LOST_WR_DATE)
+
+struct spear_rtc_config {
+ ? ? ? struct clk *clk;
+ ? ? ? spinlock_t lock;
+ ? ? ? void __iomem *ioaddr;
+};
+
+static inline void spear_rtc_clear_interrupt(struct spear_rtc_config *config)
+{
+ ? ? ? unsigned int val;
+ ? ? ? unsigned long flags;
+
+ ? ? ? spin_lock_irqsave(&config->lock, flags);
+ ? ? ? val = readl(config->ioaddr + STATUS_REG);
+ ? ? ? val |= RTC_INT_MASK;
+ ? ? ? writel(val, config->ioaddr + STATUS_REG);
+ ? ? ? spin_unlock_irqrestore(&config->lock, flags);
+}
+
+static inline void spear_rtc_enable_interrupt(struct spear_rtc_config *config)
+{
+ ? ? ? unsigned int val;
+
+ ? ? ? val = readl(config->ioaddr + CTRL_REG);
+ ? ? ? if (!(val & INT_ENABLE)) {
+ ? ? ? ? ? ? ? spear_rtc_clear_interrupt(config);
+ ? ? ? ? ? ? ? val |= INT_ENABLE;
+ ? ? ? ? ? ? ? writel(val, config->ioaddr + CTRL_REG);
+ ? ? ? }
+}
+
+static inline void spear_rtc_disable_interrupt(struct spear_rtc_config *config)
+{
+ ? ? ? unsigned int val;
+
+ ? ? ? val = readl(config->ioaddr + CTRL_REG);
+ ? ? ? if (val & INT_ENABLE) {
+ ? ? ? ? ? ? ? val &= ~INT_ENABLE;
+ ? ? ? ? ? ? ? writel(val, config->ioaddr + CTRL_REG);
+ ? ? ? }
+}
+
+static inline int is_write_complete(struct spear_rtc_config *config)
+{
+ ? ? ? int ret = 0;
+ ? ? ? unsigned long flags;
+
+ ? ? ? spin_lock_irqsave(&config->lock, flags);
+ ? ? ? if ((readl(config->ioaddr + STATUS_REG)) & STATUS_FAIL)
+ ? ? ? ? ? ? ? ret = -EIO;
+ ? ? ? spin_unlock_irqrestore(&config->lock, flags);
+
+ ? ? ? return ret;
+}
+
+static void rtc_wait_not_busy(struct spear_rtc_config *config)
+{
+ ? ? ? int status, count = 0;
+ ? ? ? unsigned long flags;
+
+ ? ? ? /* Assuming BUSY may stay active for 80 msec) */
+ ? ? ? for (count = 0; count < 80; count++) {
+ ? ? ? ? ? ? ? spin_lock_irqsave(&config->lock, flags);
+ ? ? ? ? ? ? ? status = readl(config->ioaddr + STATUS_REG);
+ ? ? ? ? ? ? ? spin_unlock_irqrestore(&config->lock, flags);
+ ? ? ? ? ? ? ? if ((status & STATUS_BUSY) == 0)
+ ? ? ? ? ? ? ? ? ? ? ? break;
+ ? ? ? ? ? ? ? /* check status busy, after each msec */
+ ? ? ? ? ? ? ? msleep(1);
+ ? ? ? }
+}
+
+static irqreturn_t spear_rtc_irq(int irq, void *dev_id)
+{
+ ? ? ? struct rtc_device *rtc = (struct rtc_device *)dev_id;
+ ? ? ? struct spear_rtc_config *config = dev_get_drvdata(&rtc->dev);
+ ? ? ? unsigned long flags, events = 0;
+ ? ? ? unsigned int irq_data;
+
+ ? ? ? spin_lock_irqsave(&config->lock, flags);
+ ? ? ? irq_data = readl(config->ioaddr + STATUS_REG);
+ ? ? ? spin_unlock_irqrestore(&config->lock, flags);
+
+ ? ? ? if ((irq_data & RTC_INT_MASK)) {
+ ? ? ? ? ? ? ? spear_rtc_clear_interrupt(config);
+ ? ? ? ? ? ? ? events = RTC_IRQF | RTC_AF;
+ ? ? ? ? ? ? ? rtc_update_irq(rtc, 1, events);
+ ? ? ? ? ? ? ? return IRQ_HANDLED;
+ ? ? ? } else
+ ? ? ? ? ? ? ? return IRQ_NONE;
+
+}
+
+static int tm2bcd(struct rtc_time *tm)
+{
+ ? ? ? if (rtc_valid_tm(tm) != 0)
+ ? ? ? ? ? ? ? return -EINVAL;
+ ? ? ? tm->tm_sec = bin2bcd(tm->tm_sec);
+ ? ? ? tm->tm_min = bin2bcd(tm->tm_min);
+ ? ? ? tm->tm_hour = bin2bcd(tm->tm_hour);
+ ? ? ? tm->tm_mday = bin2bcd(tm->tm_mday);
+ ? ? ? tm->tm_mon = bin2bcd(tm->tm_mon + 1);
+ ? ? ? tm->tm_year = bin2bcd(tm->tm_year);
+
+ ? ? ? return 0;
+}
+
+static void bcd2tm(struct rtc_time *tm)
+{
+ ? ? ? tm->tm_sec = bcd2bin(tm->tm_sec);
+ ? ? ? tm->tm_min = bcd2bin(tm->tm_min);
+ ? ? ? tm->tm_hour = bcd2bin(tm->tm_hour);
+ ? ? ? tm->tm_mday = bcd2bin(tm->tm_mday);
+ ? ? ? tm->tm_mon = bcd2bin(tm->tm_mon) - 1;
+ ? ? ? /* epoch == 1900 */
+ ? ? ? tm->tm_year = bcd2bin(tm->tm_year);
+}
+
+/*
+ * spear_rtc_read_time - set the time
+ * @dev: rtc device in use
+ * @tm: holds date and time
+ *
+ * This function read time and date. On success it will return 0
+ * otherwise -ve error is returned.
+ */
+static int spear_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+ ? ? ? struct platform_device *pdev = to_platform_device(dev);
+ ? ? ? struct rtc_device *rtc = platform_get_drvdata(pdev);
+ ? ? ? struct spear_rtc_config *config = dev_get_drvdata(&rtc->dev);
+ ? ? ? unsigned int time, date;
+
+ ? ? ? /* we don't report wday/yday/isdst ... */
+ ? ? ? rtc_wait_not_busy(config);
+
+ ? ? ? time = readl(config->ioaddr + TIME_REG);
+ ? ? ? date = readl(config->ioaddr + DATE_REG);
+ ? ? ? tm->tm_sec = (time >> SECOND_SHIFT) & SECOND_MASK;
+ ? ? ? tm->tm_min = (time >> MINUTE_SHIFT) & MIN_MASK;
+ ? ? ? tm->tm_hour = (time >> HOUR_SHIFT) & HOUR_MASK;
+ ? ? ? tm->tm_mday = (date >> MDAY_SHIFT) & DAY_MASK;
+ ? ? ? tm->tm_mon = (date >> MONTH_SHIFT) & MONTH_MASK;
+ ? ? ? tm->tm_year = (date >> YEAR_SHIFT) & YEAR_MASK;
+
+ ? ? ? bcd2tm(tm);
+ ? ? ? return 0;
+}
+
+/*
+ * spear_rtc_set_time - set the time
+ * @dev: rtc device in use
+ * @tm: holds date and time
+ *
+ * This function set time and date. On success it will return 0
+ * otherwise -ve error is returned.
+ */
+static int spear_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+ ? ? ? struct platform_device *pdev = to_platform_device(dev);
+ ? ? ? struct rtc_device *rtc = platform_get_drvdata(pdev);
+ ? ? ? struct spear_rtc_config *config = dev_get_drvdata(&rtc->dev);
+ ? ? ? unsigned int time, date, err = 0;
+
+ ? ? ? if (tm2bcd(tm) < 0)
+ ? ? ? ? ? ? ? return -EINVAL;
+
+ ? ? ? rtc_wait_not_busy(config);
+ ? ? ? time = (tm->tm_sec << SECOND_SHIFT) | (tm->tm_min << MINUTE_SHIFT) |
+ ? ? ? ? ? ? ? (tm->tm_hour << HOUR_SHIFT);
+ ? ? ? date = (tm->tm_mday << MDAY_SHIFT) | (tm->tm_mon << MONTH_SHIFT) |
+ ? ? ? ? ? ? ? (tm->tm_year << YEAR_SHIFT);
+ ? ? ? writel(time, config->ioaddr + TIME_REG);
+ ? ? ? writel(date, config->ioaddr + DATE_REG);
+ ? ? ? err = is_write_complete(config);
+ ? ? ? if (err < 0)
+ ? ? ? ? ? ? ? return err;
+
+ ? ? ? return 0;
+}
+
+/*
+ * spear_rtc_read_alarm - read the alarm time
+ * @dev: rtc device in use
+ * @alm: holds alarm date and time
+ *
+ * This function read alarm time and date. On success it will return 0
+ * otherwise -ve error is returned.
+ */
+static int spear_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
+{
+ ? ? ? struct platform_device *pdev = to_platform_device(dev);
+ ? ? ? struct rtc_device *rtc = platform_get_drvdata(pdev);
+ ? ? ? struct spear_rtc_config *config = dev_get_drvdata(&rtc->dev);
+ ? ? ? unsigned int time, date;
+
+ ? ? ? rtc_wait_not_busy(config);
+
+ ? ? ? time = readl(config->ioaddr + ALARM_TIME_REG);
+ ? ? ? date = readl(config->ioaddr + ALARM_DATE_REG);
+ ? ? ? alm->time.tm_sec = (time >> SECOND_SHIFT) & SECOND_MASK;
+ ? ? ? alm->time.tm_min = (time >> MINUTE_SHIFT) & MIN_MASK;
+ ? ? ? alm->time.tm_hour = (time >> HOUR_SHIFT) & HOUR_MASK;
+ ? ? ? alm->time.tm_mday = (date >> MDAY_SHIFT) & DAY_MASK;
+ ? ? ? alm->time.tm_mon = (date >> MONTH_SHIFT) & MONTH_MASK;
+ ? ? ? alm->time.tm_year = (date >> YEAR_SHIFT) & YEAR_MASK;
+
+ ? ? ? bcd2tm(&alm->time);
+ ? ? ? alm->enabled = readl(config->ioaddr + CTRL_REG) & INT_ENABLE;
+
+ ? ? ? return 0;
+}
+
+/*
+ * spear_rtc_set_alarm - set the alarm time
+ * @dev: rtc device in use
+ * @alm: holds alarm date and time
+ *
+ * This function set alarm time and date. On success it will return 0
+ * otherwise -ve error is returned.
+ */
+static int spear_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
+{
+ ? ? ? struct platform_device *pdev = to_platform_device(dev);
+ ? ? ? struct rtc_device *rtc = platform_get_drvdata(pdev);
+ ? ? ? struct spear_rtc_config *config = dev_get_drvdata(&rtc->dev);
+ ? ? ? unsigned int time, date, err = 0;
+
+ ? ? ? if (tm2bcd(&alm->time) < 0)
+ ? ? ? ? ? ? ? return -EINVAL;
+
+ ? ? ? rtc_wait_not_busy(config);
+
+ ? ? ? time = (alm->time.tm_sec << SECOND_SHIFT) | (alm->time.tm_min <<
+ ? ? ? ? ? ? ? ? ? ? ? MINUTE_SHIFT) | (alm->time.tm_hour << HOUR_SHIFT);
+ ? ? ? date = (alm->time.tm_mday << MDAY_SHIFT) | (alm->time.tm_mon <<
+ ? ? ? ? ? ? ? ? ? ? ? MONTH_SHIFT) | (alm->time.tm_year << YEAR_SHIFT);
+
+ ? ? ? writel(time, config->ioaddr + ALARM_TIME_REG);
+ ? ? ? writel(date, config->ioaddr + ALARM_DATE_REG);
+ ? ? ? err = is_write_complete(config);
+ ? ? ? if (err < 0)
+ ? ? ? ? ? ? ? return err;
+
+ ? ? ? if (alm->enabled)
+ ? ? ? ? ? ? ? spear_rtc_enable_interrupt(config);
+ ? ? ? else
+ ? ? ? ? ? ? ? spear_rtc_disable_interrupt(config);
+
+ ? ? ? return 0;
+}
+
+#ifdef CONFIG_RTC_INTF_DEV
+static int
+spear_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
+{
+ ? ? ? struct platform_device *pdev = to_platform_device(dev);
+ ? ? ? struct rtc_device *rtc = platform_get_drvdata(pdev);
+ ? ? ? struct spear_rtc_config *config = dev_get_drvdata(&rtc->dev);
+ ? ? ? struct rtc_time tm;
+ ? ? ? struct rtc_wkalrm alm;
+ ? ? ? void __user *uarg = (void __user *)arg;
+ ? ? ? int err = 0;
+
+ ? ? ? switch (cmd) {
+ ? ? ? ? ? ? ? /* AIE = Alarm Interrupt Enable */
+ ? ? ? case RTC_AIE_OFF:
+ ? ? ? ? ? ? ? spear_rtc_disable_interrupt(config);
+ ? ? ? ? ? ? ? break;
+ ? ? ? case RTC_AIE_ON:
+ ? ? ? ? ? ? ? spear_rtc_enable_interrupt(config);
+ ? ? ? ? ? ? ? break;
+ ? ? ? case RTC_SET_TIME:
+ ? ? ? ? ? ? ? if (copy_from_user(&tm, uarg, sizeof(tm)))
+ ? ? ? ? ? ? ? ? ? ? ? return -EFAULT;
+ ? ? ? ? ? ? ? return spear_rtc_set_time(dev, &tm);
+ ? ? ? case RTC_RD_TIME:
+ ? ? ? ? ? ? ? err = spear_rtc_read_time(dev, &tm);
+ ? ? ? ? ? ? ? if (err < 0)
+ ? ? ? ? ? ? ? ? ? ? ? return err;
+
+ ? ? ? ? ? ? ? if (copy_to_user(uarg, &tm, sizeof(tm)))
+ ? ? ? ? ? ? ? ? ? ? ? return -EFAULT;
+ ? ? ? ? ? ? ? break;
+ ? ? ? case RTC_ALM_SET:
+ ? ? ? ? ? ? ? if (copy_from_user(&alm.time, uarg, sizeof(tm)))
+ ? ? ? ? ? ? ? ? ? ? ? return -EFAULT;
+ ? ? ? ? ? ? ? alm.enabled = 0;
+ ? ? ? ? ? ? ? alm.pending = 0;
+ ? ? ? ? ? ? ? spear_rtc_set_alarm(dev, &alm);
+ ? ? ? ? ? ? ? break;
+ ? ? ? case RTC_ALM_READ:
+ ? ? ? ? ? ? ? err = spear_rtc_read_alarm(dev, &alm);
+ ? ? ? ? ? ? ? if (err < 0)
+ ? ? ? ? ? ? ? ? ? ? ? return err;
+
+ ? ? ? ? ? ? ? if (copy_to_user(uarg, &alm.time, sizeof(tm)))
+ ? ? ? ? ? ? ? ? ? ? ? return -EFAULT;
+ ? ? ? ? ? ? ? break;
+ ? ? ? default:
+ ? ? ? ? ? ? ? return -ENOIOCTLCMD;
+ ? ? ? }
+
+ ? ? ? return 0;
+}
+
+#else
+#define spear_rtc_ioctl ? ? ? ?NULL
+#endif
+
+static struct rtc_class_ops spear_rtc_ops = {
+ ? ? ? .ioctl = spear_rtc_ioctl,
+ ? ? ? .read_time = spear_rtc_read_time,
+ ? ? ? .set_time = spear_rtc_set_time,
+ ? ? ? .read_alarm = spear_rtc_read_alarm,
+ ? ? ? .set_alarm = spear_rtc_set_alarm,
+};
+
+static int __devinit spear_rtc_probe(struct platform_device *pdev)
+{
+ ? ? ? struct resource *res;
+ ? ? ? struct rtc_device *rtc;
+ ? ? ? struct spear_rtc_config *config;
+ ? ? ? unsigned int status = 0;
+ ? ? ? int irq;
+
+ ? ? ? res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ ? ? ? if (!res) {
+ ? ? ? ? ? ? ? dev_err(&pdev->dev, "no resource defined\n");
+ ? ? ? ? ? ? ? return -EBUSY;
+ ? ? ? }
+ ? ? ? if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
+ ? ? ? ? ? ? ? dev_err(&pdev->dev, "rtc region already claimed\n");
+ ? ? ? ? ? ? ? return -EBUSY;
+ ? ? ? }
+
+ ? ? ? config = kzalloc(sizeof(*config), GFP_KERNEL);
+ ? ? ? if (!config) {
+ ? ? ? ? ? ? ? dev_err(&pdev->dev, "out of memory\n");
+ ? ? ? ? ? ? ? status = -ENOMEM;
+ ? ? ? ? ? ? ? goto err_release_region;
+ ? ? ? }
+
+ ? ? ? config->clk = clk_get(&pdev->dev, NULL);
+ ? ? ? if (IS_ERR(config->clk)) {
+ ? ? ? ? ? ? ? status = PTR_ERR(config->clk);
+ ? ? ? ? ? ? ? goto err_kfree;
+ ? ? ? }
+
+ ? ? ? status = clk_enable(config->clk);
+ ? ? ? if (status < 0)
+ ? ? ? ? ? ? ? goto err_clk_put;
+
+ ? ? ? config->ioaddr = ioremap(res->start, resource_size(res));
+ ? ? ? if (!config->ioaddr) {
+ ? ? ? ? ? ? ? dev_err(&pdev->dev, "ioremap fail\n");
+ ? ? ? ? ? ? ? status = -ENOMEM;
+ ? ? ? ? ? ? ? goto err_disable_clock;
+ ? ? ? }
+
+ ? ? ? rtc = rtc_device_register(pdev->name, &pdev->dev, &spear_rtc_ops,
+ ? ? ? ? ? ? ? ? ? ? ? THIS_MODULE);
+ ? ? ? if (IS_ERR(rtc)) {
+ ? ? ? ? ? ? ? dev_err(&pdev->dev, "can't register RTC device, err %ld\n",
+ ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? PTR_ERR(rtc));
+ ? ? ? ? ? ? ? status = PTR_ERR(rtc);
+ ? ? ? ? ? ? ? goto err_iounmap;
+ ? ? ? }
+ ? ? ? platform_set_drvdata(pdev, rtc);
+ ? ? ? dev_set_drvdata(&rtc->dev, config);
+
+ ? ? ? spin_lock_init(&config->lock);
+
+ ? ? ? /* alarm irqs */
+ ? ? ? irq = platform_get_irq(pdev, 0);
+ ? ? ? if (irq < 0) {
+ ? ? ? ? ? ? ? dev_err(&pdev->dev, "no update irq?\n");
+ ? ? ? ? ? ? ? status = irq;
+ ? ? ? ? ? ? ? goto err_clear_platdata;
+ ? ? ? }
+
+ ? ? ? status = request_irq(irq, spear_rtc_irq, 0, pdev->name, rtc);
+ ? ? ? if (status) {
+ ? ? ? ? ? ? ? dev_err(&pdev->dev, "Alarm interrupt IRQ%d already \
+ ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? claimed\n", irq);
+ ? ? ? ? ? ? ? goto err_clear_platdata;
+ ? ? ? }
+
+ ? ? ? if (!device_can_wakeup(&pdev->dev))
+ ? ? ? ? ? ? ? device_init_wakeup(&pdev->dev, 1);
+
+ ? ? ? return 0;
+
+err_clear_platdata:
+ ? ? ? platform_set_drvdata(pdev, NULL);
+ ? ? ? dev_set_drvdata(&rtc->dev, NULL);
+ ? ? ? rtc_device_unregister(rtc);
+err_iounmap:
+ ? ? ? iounmap(config->ioaddr);
+err_disable_clock:
+ ? ? ? clk_disable(config->clk);
+err_clk_put:
+ ? ? ? clk_put(config->clk);
+err_kfree:
+ ? ? ? kfree(config);
+err_release_region:
+ ? ? ? release_mem_region(res->start, resource_size(res));
+
+ ? ? ? return status;
+}
+
+static int __devexit spear_rtc_remove(struct platform_device *pdev)
+{
+ ? ? ? struct rtc_device *rtc = platform_get_drvdata(pdev);
+ ? ? ? struct spear_rtc_config *config = dev_get_drvdata(&rtc->dev);
+ ? ? ? int irq;
+ ? ? ? struct resource *res;
+
+ ? ? ? /* leave rtc running, but disable irqs */
+ ? ? ? spear_rtc_disable_interrupt(config);
+ ? ? ? device_init_wakeup(&pdev->dev, 0);
+ ? ? ? irq = platform_get_irq(pdev, 0);
+ ? ? ? if (irq)
+ ? ? ? ? ? ? ? free_irq(irq, pdev);
+ ? ? ? clk_disable(config->clk);
+ ? ? ? clk_put(config->clk);
+ ? ? ? iounmap(config->ioaddr);
+ ? ? ? kfree(config);
+ ? ? ? res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ ? ? ? if (res)
+ ? ? ? ? ? ? ? release_mem_region(res->start, resource_size(res));
+ ? ? ? platform_set_drvdata(pdev, NULL);
+ ? ? ? dev_set_drvdata(&rtc->dev, NULL);
+ ? ? ? rtc_device_unregister(rtc);
+
+ ? ? ? return 0;
+}
+
+#ifdef CONFIG_PM
+
+static int spear_rtc_suspend(struct platform_device *pdev, pm_message_t state)
+{
+ ? ? ? struct rtc_device *rtc = platform_get_drvdata(pdev);
+ ? ? ? struct spear_rtc_config *config = dev_get_drvdata(&rtc->dev);
+ ? ? ? int irq;
+
+ ? ? ? irq = platform_get_irq(pdev, 0);
+ ? ? ? if (device_may_wakeup(&pdev->dev))
+ ? ? ? ? ? ? ? enable_irq_wake(irq);
+ ? ? ? else {
+ ? ? ? ? ? ? ? spear_rtc_disable_interrupt(config);
+ ? ? ? ? ? ? ? clk_disable(config->clk);
+ ? ? ? }
+
+ ? ? ? return 0;
+}
+
+static int spear_rtc_resume(struct platform_device *pdev)
+{
+ ? ? ? struct rtc_device *rtc = platform_get_drvdata(pdev);
+ ? ? ? struct spear_rtc_config *config = dev_get_drvdata(&rtc->dev);
+ ? ? ? int irq;
+
+ ? ? ? irq = platform_get_irq(pdev, 0);
+
+ ? ? ? if (device_may_wakeup(&pdev->dev))
+ ? ? ? ? ? ? ? disable_irq_wake(irq);
+ ? ? ? else {
+ ? ? ? ? ? ? ? clk_enable(config->clk);
+ ? ? ? ? ? ? ? spear_rtc_enable_interrupt(config);
+ ? ? ? }
+
+ ? ? ? return 0;
+}
+
+#else
+#define spear_rtc_suspend ? ? ?NULL
+#define spear_rtc_resume ? ? ? NULL
+#endif
+
+static void spear_rtc_shutdown(struct platform_device *pdev)
+{
+ ? ? ? struct rtc_device *rtc = platform_get_drvdata(pdev);
+ ? ? ? struct spear_rtc_config *config = dev_get_drvdata(&rtc->dev);
+
+ ? ? ? spear_rtc_disable_interrupt(config);
+ ? ? ? clk_disable(config->clk);
+}
+
+static struct platform_driver spear_rtc_driver = {
+ ? ? ? .probe = spear_rtc_probe,
+ ? ? ? .remove = __devexit_p(spear_rtc_remove),
+ ? ? ? .suspend = spear_rtc_suspend,
+ ? ? ? .resume = spear_rtc_resume,
+ ? ? ? .shutdown = spear_rtc_shutdown,
+ ? ? ? .driver = {
+ ? ? ? ? ? ? ? .name = "rtc-spear",
+ ? ? ? ? ? ? ? .owner = THIS_MODULE,
+ ? ? ? },
+};
+
+static int __init rtc_init(void)
+{
+ ? ? ? return platform_driver_register(&spear_rtc_driver);
+}
+module_init(rtc_init);
+
+static void __exit rtc_exit(void)
+{
+ ? ? ? platform_driver_unregister(&spear_rtc_driver);
+}
+module_exit(rtc_exit);
+
+MODULE_ALIAS("rtc-spear");
+MODULE_AUTHOR("Rajeev Kumar");
+MODULE_LICENSE("GPL");
--

1.7.2.2

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