[PATCH 06/34] RTC: DaVinci RTC driver
Kevin Hilman
khilman at deeprootsystems.com
Thu May 6 19:23:57 EDT 2010
From: Miguel Aguilar <miguel.aguilar at ridgerun.com>
This driver features:
* Alarm support.
* Periodic interrupt by using a timer include into the RTC module.
* The update interrupt is not supported by this RTC module.
This driver was tested on a DM365 EVM by using the rtc-test application
from the Documentation/rtc.txt.
Signed-off-by: Miguel Aguilar <miguel.aguilar at ridgerun.com>
Signed-off-by: Kevin Hilman <khilman at deeprootsystems.com>
Acked-by: Alessandro Zummo <a.zummo at towertech.it>
---
drivers/rtc/Kconfig | 10 +
drivers/rtc/Makefile | 1 +
drivers/rtc/rtc-davinci.c | 673 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 684 insertions(+), 0 deletions(-)
create mode 100644 drivers/rtc/rtc-davinci.c
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 6a13037..50ac047 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -620,6 +620,16 @@ config RTC_DRV_NUC900
comment "on-CPU RTC drivers"
+config RTC_DRV_DAVINCI
+ tristate "TI DaVinci RTC"
+ depends on ARCH_DAVINCI_DM365
+ help
+ If you say yes here you get support for the RTC on the
+ DaVinci platforms (DM365).
+
+ This driver can also be built as a module. If so, the module
+ will be called rtc-davinci.
+
config RTC_DRV_OMAP
tristate "TI OMAP1"
depends on ARCH_OMAP15XX || ARCH_OMAP16XX || ARCH_OMAP730 || ARCH_DAVINCI_DA8XX
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 44ef194..245311a 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -27,6 +27,7 @@ obj-$(CONFIG_RTC_DRV_BQ32K) += rtc-bq32k.o
obj-$(CONFIG_RTC_DRV_BQ4802) += rtc-bq4802.o
obj-$(CONFIG_RTC_DRV_CMOS) += rtc-cmos.o
obj-$(CONFIG_RTC_DRV_COH901331) += rtc-coh901331.o
+obj-$(CONFIG_RTC_DRV_DAVINCI) += rtc-davinci.o
obj-$(CONFIG_RTC_DRV_DM355EVM) += rtc-dm355evm.o
obj-$(CONFIG_RTC_DRV_DS1216) += rtc-ds1216.o
obj-$(CONFIG_RTC_DRV_DS1286) += rtc-ds1286.o
diff --git a/drivers/rtc/rtc-davinci.c b/drivers/rtc/rtc-davinci.c
new file mode 100644
index 0000000..92a8f6c
--- /dev/null
+++ b/drivers/rtc/rtc-davinci.c
@@ -0,0 +1,673 @@
+/*
+ * DaVinci Power Management and Real Time Clock Driver for TI platforms
+ *
+ * Copyright (C) 2009 Texas Instruments, Inc
+ *
+ * Author: Miguel Aguilar <miguel.aguilar at ridgerun.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/delay.h>
+#include <linux/spinlock.h>
+#include <linux/rtc.h>
+#include <linux/bcd.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+
+/*
+ * The DaVinci RTC is a simple RTC with the following
+ * Sec: 0 - 59 : BCD count
+ * Min: 0 - 59 : BCD count
+ * Hour: 0 - 23 : BCD count
+ * Day: 0 - 0x7FFF(32767) : Binary count ( Over 89 years )
+ */
+
+/* PRTC interface registers */
+#define DAVINCI_PRTCIF_PID 0x00
+#define PRTCIF_CTLR 0x04
+#define PRTCIF_LDATA 0x08
+#define PRTCIF_UDATA 0x0C
+#define PRTCIF_INTEN 0x10
+#define PRTCIF_INTFLG 0x14
+
+/* PRTCIF_CTLR bit fields */
+#define PRTCIF_CTLR_BUSY BIT(31)
+#define PRTCIF_CTLR_SIZE BIT(25)
+#define PRTCIF_CTLR_DIR BIT(24)
+#define PRTCIF_CTLR_BENU_MSB BIT(23)
+#define PRTCIF_CTLR_BENU_3RD_BYTE BIT(22)
+#define PRTCIF_CTLR_BENU_2ND_BYTE BIT(21)
+#define PRTCIF_CTLR_BENU_LSB BIT(20)
+#define PRTCIF_CTLR_BENU_MASK (0x00F00000)
+#define PRTCIF_CTLR_BENL_MSB BIT(19)
+#define PRTCIF_CTLR_BENL_3RD_BYTE BIT(18)
+#define PRTCIF_CTLR_BENL_2ND_BYTE BIT(17)
+#define PRTCIF_CTLR_BENL_LSB BIT(16)
+#define PRTCIF_CTLR_BENL_MASK (0x000F0000)
+
+/* PRTCIF_INTEN bit fields */
+#define PRTCIF_INTEN_RTCSS BIT(1)
+#define PRTCIF_INTEN_RTCIF BIT(0)
+#define PRTCIF_INTEN_MASK (PRTCIF_INTEN_RTCSS \
+ | PRTCIF_INTEN_RTCIF)
+
+/* PRTCIF_INTFLG bit fields */
+#define PRTCIF_INTFLG_RTCSS BIT(1)
+#define PRTCIF_INTFLG_RTCIF BIT(0)
+#define PRTCIF_INTFLG_MASK (PRTCIF_INTFLG_RTCSS \
+ | PRTCIF_INTFLG_RTCIF)
+
+/* PRTC subsystem registers */
+#define PRTCSS_RTC_INTC_EXTENA1 (0x0C)
+#define PRTCSS_RTC_CTRL (0x10)
+#define PRTCSS_RTC_WDT (0x11)
+#define PRTCSS_RTC_TMR0 (0x12)
+#define PRTCSS_RTC_TMR1 (0x13)
+#define PRTCSS_RTC_CCTRL (0x14)
+#define PRTCSS_RTC_SEC (0x15)
+#define PRTCSS_RTC_MIN (0x16)
+#define PRTCSS_RTC_HOUR (0x17)
+#define PRTCSS_RTC_DAY0 (0x18)
+#define PRTCSS_RTC_DAY1 (0x19)
+#define PRTCSS_RTC_AMIN (0x1A)
+#define PRTCSS_RTC_AHOUR (0x1B)
+#define PRTCSS_RTC_ADAY0 (0x1C)
+#define PRTCSS_RTC_ADAY1 (0x1D)
+#define PRTCSS_RTC_CLKC_CNT (0x20)
+
+/* PRTCSS_RTC_INTC_EXTENA1 */
+#define PRTCSS_RTC_INTC_EXTENA1_MASK (0x07)
+
+/* PRTCSS_RTC_CTRL bit fields */
+#define PRTCSS_RTC_CTRL_WDTBUS BIT(7)
+#define PRTCSS_RTC_CTRL_WEN BIT(6)
+#define PRTCSS_RTC_CTRL_WDRT BIT(5)
+#define PRTCSS_RTC_CTRL_WDTFLG BIT(4)
+#define PRTCSS_RTC_CTRL_TE BIT(3)
+#define PRTCSS_RTC_CTRL_TIEN BIT(2)
+#define PRTCSS_RTC_CTRL_TMRFLG BIT(1)
+#define PRTCSS_RTC_CTRL_TMMD BIT(0)
+
+/* PRTCSS_RTC_CCTRL bit fields */
+#define PRTCSS_RTC_CCTRL_CALBUSY BIT(7)
+#define PRTCSS_RTC_CCTRL_DAEN BIT(5)
+#define PRTCSS_RTC_CCTRL_HAEN BIT(4)
+#define PRTCSS_RTC_CCTRL_MAEN BIT(3)
+#define PRTCSS_RTC_CCTRL_ALMFLG BIT(2)
+#define PRTCSS_RTC_CCTRL_AIEN BIT(1)
+#define PRTCSS_RTC_CCTRL_CAEN BIT(0)
+
+static DEFINE_SPINLOCK(davinci_rtc_lock);
+
+struct davinci_rtc {
+ struct rtc_device *rtc;
+ void __iomem *base;
+ resource_size_t pbase;
+ size_t base_size;
+ int irq;
+};
+
+static inline void rtcif_write(struct davinci_rtc *davinci_rtc,
+ u32 val, u32 addr)
+{
+ writel(val, davinci_rtc->base + addr);
+}
+
+static inline u32 rtcif_read(struct davinci_rtc *davinci_rtc, u32 addr)
+{
+ return readl(davinci_rtc->base + addr);
+}
+
+static inline void rtcif_wait(struct davinci_rtc *davinci_rtc)
+{
+ while (rtcif_read(davinci_rtc, PRTCIF_CTLR) & PRTCIF_CTLR_BUSY)
+ cpu_relax();
+}
+
+static inline void rtcss_write(struct davinci_rtc *davinci_rtc,
+ unsigned long val, u8 addr)
+{
+ rtcif_wait(davinci_rtc);
+
+ rtcif_write(davinci_rtc, PRTCIF_CTLR_BENL_LSB | addr, PRTCIF_CTLR);
+ rtcif_write(davinci_rtc, val, PRTCIF_LDATA);
+
+ rtcif_wait(davinci_rtc);
+}
+
+static inline u8 rtcss_read(struct davinci_rtc *davinci_rtc, u8 addr)
+{
+ rtcif_wait(davinci_rtc);
+
+ rtcif_write(davinci_rtc, PRTCIF_CTLR_DIR | PRTCIF_CTLR_BENL_LSB | addr,
+ PRTCIF_CTLR);
+
+ rtcif_wait(davinci_rtc);
+
+ return rtcif_read(davinci_rtc, PRTCIF_LDATA);
+}
+
+static inline void davinci_rtcss_calendar_wait(struct davinci_rtc *davinci_rtc)
+{
+ while (rtcss_read(davinci_rtc, PRTCSS_RTC_CCTRL) &
+ PRTCSS_RTC_CCTRL_CALBUSY)
+ cpu_relax();
+}
+
+static irqreturn_t davinci_rtc_interrupt(int irq, void *class_dev)
+{
+ struct davinci_rtc *davinci_rtc = class_dev;
+ unsigned long events = 0;
+ u32 irq_flg;
+ u8 alm_irq, tmr_irq;
+ u8 rtc_ctrl, rtc_cctrl;
+ int ret = IRQ_NONE;
+
+ irq_flg = rtcif_read(davinci_rtc, PRTCIF_INTFLG) &
+ PRTCIF_INTFLG_RTCSS;
+
+ alm_irq = rtcss_read(davinci_rtc, PRTCSS_RTC_CCTRL) &
+ PRTCSS_RTC_CCTRL_ALMFLG;
+
+ tmr_irq = rtcss_read(davinci_rtc, PRTCSS_RTC_CTRL) &
+ PRTCSS_RTC_CTRL_TMRFLG;
+
+ if (irq_flg) {
+ if (alm_irq) {
+ events |= RTC_IRQF | RTC_AF;
+ rtc_cctrl = rtcss_read(davinci_rtc, PRTCSS_RTC_CCTRL);
+ rtc_cctrl |= PRTCSS_RTC_CCTRL_ALMFLG;
+ rtcss_write(davinci_rtc, rtc_cctrl, PRTCSS_RTC_CCTRL);
+ } else if (tmr_irq) {
+ events |= RTC_IRQF | RTC_PF;
+ rtc_ctrl = rtcss_read(davinci_rtc, PRTCSS_RTC_CTRL);
+ rtc_ctrl |= PRTCSS_RTC_CTRL_TMRFLG;
+ rtcss_write(davinci_rtc, rtc_ctrl, PRTCSS_RTC_CTRL);
+ }
+
+ rtcif_write(davinci_rtc, PRTCIF_INTFLG_RTCSS,
+ PRTCIF_INTFLG);
+ rtc_update_irq(davinci_rtc->rtc, 1, events);
+
+ ret = IRQ_HANDLED;
+ }
+
+ return ret;
+}
+
+static int
+davinci_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
+{
+ struct davinci_rtc *davinci_rtc = dev_get_drvdata(dev);
+ u8 rtc_ctrl;
+ unsigned long flags;
+ int ret = 0;
+
+ spin_lock_irqsave(&davinci_rtc_lock, flags);
+
+ rtc_ctrl = rtcss_read(davinci_rtc, PRTCSS_RTC_CTRL);
+
+ switch (cmd) {
+ case RTC_WIE_ON:
+ rtc_ctrl |= PRTCSS_RTC_CTRL_WEN | PRTCSS_RTC_CTRL_WDTFLG;
+ break;
+ case RTC_WIE_OFF:
+ rtc_ctrl &= ~PRTCSS_RTC_CTRL_WEN;
+ break;
+ case RTC_UIE_OFF:
+ case RTC_UIE_ON:
+ ret = -ENOTTY;
+ break;
+ default:
+ ret = -ENOIOCTLCMD;
+ }
+
+ rtcss_write(davinci_rtc, rtc_ctrl, PRTCSS_RTC_CTRL);
+
+ spin_unlock_irqrestore(&davinci_rtc_lock, flags);
+
+ return ret;
+}
+
+static int convertfromdays(u16 days, struct rtc_time *tm)
+{
+ int tmp_days, year, mon;
+
+ for (year = 2000;; year++) {
+ tmp_days = rtc_year_days(1, 12, year);
+ if (days >= tmp_days)
+ days -= tmp_days;
+ else {
+ for (mon = 0;; mon++) {
+ tmp_days = rtc_month_days(mon, year);
+ if (days >= tmp_days) {
+ days -= tmp_days;
+ } else {
+ tm->tm_year = year - 1900;
+ tm->tm_mon = mon;
+ tm->tm_mday = days + 1;
+ break;
+ }
+ }
+ break;
+ }
+ }
+ return 0;
+}
+
+static int convert2days(u16 *days, struct rtc_time *tm)
+{
+ int i;
+ *days = 0;
+
+ /* epoch == 1900 */
+ if (tm->tm_year < 100 || tm->tm_year > 199)
+ return -EINVAL;
+
+ for (i = 2000; i < 1900 + tm->tm_year; i++)
+ *days += rtc_year_days(1, 12, i);
+
+ *days += rtc_year_days(tm->tm_mday, tm->tm_mon, 1900 + tm->tm_year);
+
+ return 0;
+}
+
+static int davinci_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+ struct davinci_rtc *davinci_rtc = dev_get_drvdata(dev);
+ u16 days = 0;
+ u8 day0, day1;
+ unsigned long flags;
+
+ spin_lock_irqsave(&davinci_rtc_lock, flags);
+
+ davinci_rtcss_calendar_wait(davinci_rtc);
+ tm->tm_sec = bcd2bin(rtcss_read(davinci_rtc, PRTCSS_RTC_SEC));
+
+ davinci_rtcss_calendar_wait(davinci_rtc);
+ tm->tm_min = bcd2bin(rtcss_read(davinci_rtc, PRTCSS_RTC_MIN));
+
+ davinci_rtcss_calendar_wait(davinci_rtc);
+ tm->tm_hour = bcd2bin(rtcss_read(davinci_rtc, PRTCSS_RTC_HOUR));
+
+ davinci_rtcss_calendar_wait(davinci_rtc);
+ day0 = rtcss_read(davinci_rtc, PRTCSS_RTC_DAY0);
+
+ davinci_rtcss_calendar_wait(davinci_rtc);
+ day1 = rtcss_read(davinci_rtc, PRTCSS_RTC_DAY1);
+
+ spin_unlock_irqrestore(&davinci_rtc_lock, flags);
+
+ days |= day1;
+ days <<= 8;
+ days |= day0;
+
+ if (convertfromdays(days, tm) < 0)
+ return -EINVAL;
+
+ return 0;
+}
+
+static int davinci_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+ struct davinci_rtc *davinci_rtc = dev_get_drvdata(dev);
+ u16 days;
+ u8 rtc_cctrl;
+ unsigned long flags;
+
+ if (convert2days(&days, tm) < 0)
+ return -EINVAL;
+
+ spin_lock_irqsave(&davinci_rtc_lock, flags);
+
+ davinci_rtcss_calendar_wait(davinci_rtc);
+ rtcss_write(davinci_rtc, bin2bcd(tm->tm_sec), PRTCSS_RTC_SEC);
+
+ davinci_rtcss_calendar_wait(davinci_rtc);
+ rtcss_write(davinci_rtc, bin2bcd(tm->tm_min), PRTCSS_RTC_MIN);
+
+ davinci_rtcss_calendar_wait(davinci_rtc);
+ rtcss_write(davinci_rtc, bin2bcd(tm->tm_hour), PRTCSS_RTC_HOUR);
+
+ davinci_rtcss_calendar_wait(davinci_rtc);
+ rtcss_write(davinci_rtc, days & 0xFF, PRTCSS_RTC_DAY0);
+
+ davinci_rtcss_calendar_wait(davinci_rtc);
+ rtcss_write(davinci_rtc, (days & 0xFF00) >> 8, PRTCSS_RTC_DAY1);
+
+ rtc_cctrl = rtcss_read(davinci_rtc, PRTCSS_RTC_CCTRL);
+ rtc_cctrl |= PRTCSS_RTC_CCTRL_CAEN;
+ rtcss_write(davinci_rtc, rtc_cctrl, PRTCSS_RTC_CCTRL);
+
+ spin_unlock_irqrestore(&davinci_rtc_lock, flags);
+
+ return 0;
+}
+
+static int davinci_rtc_alarm_irq_enable(struct device *dev,
+ unsigned int enabled)
+{
+ struct davinci_rtc *davinci_rtc = dev_get_drvdata(dev);
+ unsigned long flags;
+ u8 rtc_cctrl = rtcss_read(davinci_rtc, PRTCSS_RTC_CCTRL);
+
+ spin_lock_irqsave(&davinci_rtc_lock, flags);
+
+ if (enabled)
+ rtc_cctrl |= PRTCSS_RTC_CCTRL_DAEN |
+ PRTCSS_RTC_CCTRL_HAEN |
+ PRTCSS_RTC_CCTRL_MAEN |
+ PRTCSS_RTC_CCTRL_ALMFLG |
+ PRTCSS_RTC_CCTRL_AIEN;
+ else
+ rtc_cctrl &= ~PRTCSS_RTC_CCTRL_AIEN;
+
+ davinci_rtcss_calendar_wait(davinci_rtc);
+ rtcss_write(davinci_rtc, rtc_cctrl, PRTCSS_RTC_CCTRL);
+
+ spin_unlock_irqrestore(&davinci_rtc_lock, flags);
+
+ return 0;
+}
+
+static int davinci_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
+{
+ struct davinci_rtc *davinci_rtc = dev_get_drvdata(dev);
+ u16 days = 0;
+ u8 day0, day1;
+ unsigned long flags;
+
+ spin_lock_irqsave(&davinci_rtc_lock, flags);
+
+ davinci_rtcss_calendar_wait(davinci_rtc);
+ alm->time.tm_min = bcd2bin(rtcss_read(davinci_rtc, PRTCSS_RTC_AMIN));
+
+ davinci_rtcss_calendar_wait(davinci_rtc);
+ alm->time.tm_hour = bcd2bin(rtcss_read(davinci_rtc, PRTCSS_RTC_AHOUR));
+
+ davinci_rtcss_calendar_wait(davinci_rtc);
+ day0 = rtcss_read(davinci_rtc, PRTCSS_RTC_ADAY0);
+
+ davinci_rtcss_calendar_wait(davinci_rtc);
+ day1 = rtcss_read(davinci_rtc, PRTCSS_RTC_ADAY1);
+
+ spin_unlock_irqrestore(&davinci_rtc_lock, flags);
+ days |= day1;
+ days <<= 8;
+ days |= day0;
+
+ if (convertfromdays(days, &alm->time) < 0)
+ return -EINVAL;
+
+ alm->pending = !!(rtcss_read(davinci_rtc,
+ PRTCSS_RTC_CCTRL) &
+ PRTCSS_RTC_CCTRL_AIEN);
+ alm->enabled = alm->pending && device_may_wakeup(dev);
+
+ return 0;
+}
+
+static int davinci_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
+{
+ struct davinci_rtc *davinci_rtc = dev_get_drvdata(dev);
+ unsigned long flags;
+ u16 days;
+
+ if (alm->time.tm_mday <= 0 && alm->time.tm_mon < 0
+ && alm->time.tm_year < 0) {
+ struct rtc_time tm;
+ unsigned long now, then;
+
+ davinci_rtc_read_time(dev, &tm);
+ rtc_tm_to_time(&tm, &now);
+
+ alm->time.tm_mday = tm.tm_mday;
+ alm->time.tm_mon = tm.tm_mon;
+ alm->time.tm_year = tm.tm_year;
+ rtc_tm_to_time(&alm->time, &then);
+
+ if (then < now) {
+ rtc_time_to_tm(now + 24 * 60 * 60, &tm);
+ alm->time.tm_mday = tm.tm_mday;
+ alm->time.tm_mon = tm.tm_mon;
+ alm->time.tm_year = tm.tm_year;
+ }
+ }
+
+ if (convert2days(&days, &alm->time) < 0)
+ return -EINVAL;
+
+ spin_lock_irqsave(&davinci_rtc_lock, flags);
+
+ davinci_rtcss_calendar_wait(davinci_rtc);
+ rtcss_write(davinci_rtc, bin2bcd(alm->time.tm_min), PRTCSS_RTC_AMIN);
+
+ davinci_rtcss_calendar_wait(davinci_rtc);
+ rtcss_write(davinci_rtc, bin2bcd(alm->time.tm_hour), PRTCSS_RTC_AHOUR);
+
+ davinci_rtcss_calendar_wait(davinci_rtc);
+ rtcss_write(davinci_rtc, days & 0xFF, PRTCSS_RTC_ADAY0);
+
+ davinci_rtcss_calendar_wait(davinci_rtc);
+ rtcss_write(davinci_rtc, (days & 0xFF00) >> 8, PRTCSS_RTC_ADAY1);
+
+ spin_unlock_irqrestore(&davinci_rtc_lock, flags);
+
+ return 0;
+}
+
+static int davinci_rtc_irq_set_state(struct device *dev, int enabled)
+{
+ struct davinci_rtc *davinci_rtc = dev_get_drvdata(dev);
+ unsigned long flags;
+ u8 rtc_ctrl;
+
+ spin_lock_irqsave(&davinci_rtc_lock, flags);
+
+ rtc_ctrl = rtcss_read(davinci_rtc, PRTCSS_RTC_CTRL);
+
+ if (enabled) {
+ while (rtcss_read(davinci_rtc, PRTCSS_RTC_CTRL)
+ & PRTCSS_RTC_CTRL_WDTBUS)
+ cpu_relax();
+
+ rtc_ctrl |= PRTCSS_RTC_CTRL_TE;
+ rtcss_write(davinci_rtc, rtc_ctrl, PRTCSS_RTC_CTRL);
+
+ rtcss_write(davinci_rtc, 0x0, PRTCSS_RTC_CLKC_CNT);
+
+ rtc_ctrl |= PRTCSS_RTC_CTRL_TIEN |
+ PRTCSS_RTC_CTRL_TMMD |
+ PRTCSS_RTC_CTRL_TMRFLG;
+ } else
+ rtc_ctrl &= ~PRTCSS_RTC_CTRL_TIEN;
+
+ rtcss_write(davinci_rtc, rtc_ctrl, PRTCSS_RTC_CTRL);
+
+ spin_unlock_irqrestore(&davinci_rtc_lock, flags);
+
+ return 0;
+}
+
+static int davinci_rtc_irq_set_freq(struct device *dev, int freq)
+{
+ struct davinci_rtc *davinci_rtc = dev_get_drvdata(dev);
+ unsigned long flags;
+ u16 tmr_counter = (0x8000 >> (ffs(freq) - 1));
+
+ spin_lock_irqsave(&davinci_rtc_lock, flags);
+
+ rtcss_write(davinci_rtc, tmr_counter & 0xFF, PRTCSS_RTC_TMR0);
+ rtcss_write(davinci_rtc, (tmr_counter & 0xFF00) >> 8, PRTCSS_RTC_TMR1);
+
+ spin_unlock_irqrestore(&davinci_rtc_lock, flags);
+
+ return 0;
+}
+
+static struct rtc_class_ops davinci_rtc_ops = {
+ .ioctl = davinci_rtc_ioctl,
+ .read_time = davinci_rtc_read_time,
+ .set_time = davinci_rtc_set_time,
+ .alarm_irq_enable = davinci_rtc_alarm_irq_enable,
+ .read_alarm = davinci_rtc_read_alarm,
+ .set_alarm = davinci_rtc_set_alarm,
+ .irq_set_state = davinci_rtc_irq_set_state,
+ .irq_set_freq = davinci_rtc_irq_set_freq,
+};
+
+static int __init davinci_rtc_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct davinci_rtc *davinci_rtc;
+ struct resource *res, *mem;
+ int ret = 0;
+
+ davinci_rtc = kzalloc(sizeof(struct davinci_rtc), GFP_KERNEL);
+ if (!davinci_rtc) {
+ dev_dbg(dev, "could not allocate memory for private data\n");
+ return -ENOMEM;
+ }
+
+ davinci_rtc->irq = platform_get_irq(pdev, 0);
+ if (davinci_rtc->irq < 0) {
+ dev_err(dev, "no RTC irq\n");
+ ret = davinci_rtc->irq;
+ goto fail1;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(dev, "no mem resource\n");
+ ret = -EINVAL;
+ goto fail1;
+ }
+
+ davinci_rtc->pbase = res->start;
+ davinci_rtc->base_size = resource_size(res);
+
+ mem = request_mem_region(davinci_rtc->pbase, davinci_rtc->base_size,
+ pdev->name);
+ if (!mem) {
+ dev_err(dev, "RTC registers at %08x are not free\n",
+ davinci_rtc->pbase);
+ ret = -EBUSY;
+ goto fail1;
+ }
+
+ davinci_rtc->base = ioremap(davinci_rtc->pbase, davinci_rtc->base_size);
+ if (!davinci_rtc->base) {
+ dev_err(dev, "unable to ioremap MEM resource\n");
+ ret = -ENOMEM;
+ goto fail2;
+ }
+
+ davinci_rtc->rtc = rtc_device_register(pdev->name, &pdev->dev,
+ &davinci_rtc_ops, THIS_MODULE);
+ if (IS_ERR(davinci_rtc->rtc)) {
+ dev_err(dev, "unable to register RTC device, err %ld\n",
+ PTR_ERR(davinci_rtc->rtc));
+ goto fail3;
+ }
+
+ rtcif_write(davinci_rtc, PRTCIF_INTFLG_RTCSS, PRTCIF_INTFLG);
+ rtcif_write(davinci_rtc, 0, PRTCIF_INTEN);
+ rtcss_write(davinci_rtc, 0, PRTCSS_RTC_INTC_EXTENA1);
+
+ rtcss_write(davinci_rtc, 0, PRTCSS_RTC_CTRL);
+ rtcss_write(davinci_rtc, 0, PRTCSS_RTC_CCTRL);
+
+ ret = request_irq(davinci_rtc->irq, davinci_rtc_interrupt,
+ IRQF_DISABLED, "davinci_rtc", davinci_rtc);
+ if (ret < 0) {
+ dev_err(dev, "unable to register davinci RTC interrupt\n");
+ goto fail4;
+ }
+
+ /* Enable interrupts */
+ rtcif_write(davinci_rtc, PRTCIF_INTEN_RTCSS, PRTCIF_INTEN);
+ rtcss_write(davinci_rtc, PRTCSS_RTC_INTC_EXTENA1_MASK,
+ PRTCSS_RTC_INTC_EXTENA1);
+
+ rtcss_write(davinci_rtc, PRTCSS_RTC_CCTRL_CAEN, PRTCSS_RTC_CCTRL);
+
+ platform_set_drvdata(pdev, davinci_rtc);
+
+ device_init_wakeup(&pdev->dev, 0);
+
+ return 0;
+
+fail4:
+ rtc_device_unregister(davinci_rtc->rtc);
+fail3:
+ iounmap(davinci_rtc->base);
+fail2:
+ release_mem_region(davinci_rtc->pbase, davinci_rtc->base_size);
+fail1:
+ kfree(davinci_rtc);
+
+ return ret;
+}
+
+static int __devexit davinci_rtc_remove(struct platform_device *pdev)
+{
+ struct davinci_rtc *davinci_rtc = platform_get_drvdata(pdev);
+
+ device_init_wakeup(&pdev->dev, 0);
+
+ rtcif_write(davinci_rtc, 0, PRTCIF_INTEN);
+
+ free_irq(davinci_rtc->irq, davinci_rtc);
+
+ rtc_device_unregister(davinci_rtc->rtc);
+
+ iounmap(davinci_rtc->base);
+ release_mem_region(davinci_rtc->pbase, davinci_rtc->base_size);
+
+ platform_set_drvdata(pdev, NULL);
+
+ kfree(davinci_rtc);
+
+ return 0;
+}
+
+static struct platform_driver davinci_rtc_driver = {
+ .probe = davinci_rtc_probe,
+ .remove = __devexit_p(davinci_rtc_remove),
+ .driver = {
+ .name = "rtc_davinci",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init rtc_init(void)
+{
+ return platform_driver_probe(&davinci_rtc_driver, davinci_rtc_probe);
+}
+module_init(rtc_init);
+
+static void __exit rtc_exit(void)
+{
+ platform_driver_unregister(&davinci_rtc_driver);
+}
+module_exit(rtc_exit);
+
+MODULE_AUTHOR("Miguel Aguilar <miguel.aguilar at ridgerun.com>");
+MODULE_DESCRIPTION("Texas Instruments DaVinci PRTC Driver");
+MODULE_LICENSE("GPL");
--
1.7.0.2
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