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	rtc: Add rtc support to 88PM80X PMIC
add rtc driver for MARVELL 88PM80X PMIC and enable rtc function. Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Qiao Zhou <zhouqiao@marvell.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
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					 3 changed files with 382 additions and 0 deletions
				
			
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					@ -135,6 +135,16 @@ config RTC_DRV_88PM860X
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	  This driver can also be built as a module. If so, the module
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						  This driver can also be built as a module. If so, the module
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	  will be called rtc-88pm860x.
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						  will be called rtc-88pm860x.
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					config RTC_DRV_88PM80X
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						tristate "Marvell 88PM80x"
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						depends on RTC_CLASS && I2C && MFD_88PM800
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						help
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						  If you say yes here you get support for RTC function in Marvell
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						  88PM80x chips.
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						  This driver can also be built as a module. If so, the module
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						  will be called rtc-88pm80x.
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config RTC_DRV_DS1307
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					config RTC_DRV_DS1307
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	tristate "Dallas/Maxim DS1307/37/38/39/40, ST M41T00, EPSON RX-8025"
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						tristate "Dallas/Maxim DS1307/37/38/39/40, ST M41T00, EPSON RX-8025"
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	help
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						help
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					@ -16,6 +16,7 @@ rtc-core-$(CONFIG_RTC_INTF_SYSFS) += rtc-sysfs.o
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# Keep the list ordered.
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					# Keep the list ordered.
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obj-$(CONFIG_RTC_DRV_88PM860X)  += rtc-88pm860x.o
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					obj-$(CONFIG_RTC_DRV_88PM860X)  += rtc-88pm860x.o
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					obj-$(CONFIG_RTC_DRV_88PM80X)	+= rtc-88pm80x.o
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obj-$(CONFIG_RTC_DRV_AB3100)	+= rtc-ab3100.o
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					obj-$(CONFIG_RTC_DRV_AB3100)	+= rtc-ab3100.o
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obj-$(CONFIG_RTC_DRV_AB8500)	+= rtc-ab8500.o
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					obj-$(CONFIG_RTC_DRV_AB8500)	+= rtc-ab8500.o
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obj-$(CONFIG_RTC_DRV_AT32AP700X)+= rtc-at32ap700x.o
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					obj-$(CONFIG_RTC_DRV_AT32AP700X)+= rtc-at32ap700x.o
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										371
									
								
								drivers/rtc/rtc-88pm80x.c
									
									
									
									
									
										Normal file
									
								
							
							
						
						
									
										371
									
								
								drivers/rtc/rtc-88pm80x.c
									
									
									
									
									
										Normal file
									
								
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					@ -0,0 +1,371 @@
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					/*
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					 * Real Time Clock driver for Marvell 88PM80x PMIC
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					 *
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					 * Copyright (c) 2012 Marvell International Ltd.
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					 *  Wenzeng Chen<wzch@marvell.com>
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					 *  Qiao Zhou <zhouqiao@marvell.com>
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					 *
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					 * This file is subject to the terms and conditions of the GNU General
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					 * Public License. See the file "COPYING" in the main directory of this
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					 * archive for more details.
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					 *
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					 * This program is distributed in the hope that it will be useful,
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					 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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					 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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					 * GNU General Public License for more details.
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					 *
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					 * You should have received a copy of the GNU General Public License
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					 * along with this program; if not, write to the Free Software
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					 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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					 */
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					#include <linux/kernel.h>
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					#include <linux/module.h>
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					#include <linux/slab.h>
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					#include <linux/regmap.h>
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					#include <linux/mfd/core.h>
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					#include <linux/mfd/88pm80x.h>
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					#include <linux/rtc.h>
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					#define PM800_RTC_COUNTER1		(0xD1)
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					#define PM800_RTC_COUNTER2		(0xD2)
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					#define PM800_RTC_COUNTER3		(0xD3)
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					#define PM800_RTC_COUNTER4		(0xD4)
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					#define PM800_RTC_EXPIRE1_1		(0xD5)
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					#define PM800_RTC_EXPIRE1_2		(0xD6)
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					#define PM800_RTC_EXPIRE1_3		(0xD7)
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					#define PM800_RTC_EXPIRE1_4		(0xD8)
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					#define PM800_RTC_TRIM1			(0xD9)
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					#define PM800_RTC_TRIM2			(0xDA)
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					#define PM800_RTC_TRIM3			(0xDB)
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					#define PM800_RTC_TRIM4			(0xDC)
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					#define PM800_RTC_EXPIRE2_1		(0xDD)
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					#define PM800_RTC_EXPIRE2_2		(0xDE)
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					#define PM800_RTC_EXPIRE2_3		(0xDF)
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					#define PM800_RTC_EXPIRE2_4		(0xE0)
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					#define PM800_POWER_DOWN_LOG1	(0xE5)
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					#define PM800_POWER_DOWN_LOG2	(0xE6)
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					struct pm80x_rtc_info {
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						struct pm80x_chip *chip;
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						struct regmap *map;
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						struct rtc_device *rtc_dev;
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						struct device *dev;
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						struct delayed_work calib_work;
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						int irq;
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						int vrtc;
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					};
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					static irqreturn_t rtc_update_handler(int irq, void *data)
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					{
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						struct pm80x_rtc_info *info = (struct pm80x_rtc_info *)data;
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						int mask;
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						mask = PM800_ALARM | PM800_ALARM_WAKEUP;
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						regmap_update_bits(info->map, PM800_RTC_CONTROL, mask | PM800_ALARM1_EN,
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								   mask);
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						rtc_update_irq(info->rtc_dev, 1, RTC_AF);
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						return IRQ_HANDLED;
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					}
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					static int pm80x_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
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					{
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						struct pm80x_rtc_info *info = dev_get_drvdata(dev);
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						if (enabled)
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							regmap_update_bits(info->map, PM800_RTC_CONTROL,
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									   PM800_ALARM1_EN, PM800_ALARM1_EN);
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						else
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							regmap_update_bits(info->map, PM800_RTC_CONTROL,
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									   PM800_ALARM1_EN, 0);
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						return 0;
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					}
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					/*
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					 * Calculate the next alarm time given the requested alarm time mask
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					 * and the current time.
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					 */
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					static void rtc_next_alarm_time(struct rtc_time *next, struct rtc_time *now,
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									struct rtc_time *alrm)
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					{
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						unsigned long next_time;
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						unsigned long now_time;
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						next->tm_year = now->tm_year;
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						next->tm_mon = now->tm_mon;
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						next->tm_mday = now->tm_mday;
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						next->tm_hour = alrm->tm_hour;
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						next->tm_min = alrm->tm_min;
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						next->tm_sec = alrm->tm_sec;
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						rtc_tm_to_time(now, &now_time);
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						rtc_tm_to_time(next, &next_time);
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						if (next_time < now_time) {
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							/* Advance one day */
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							next_time += 60 * 60 * 24;
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							rtc_time_to_tm(next_time, next);
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						}
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					}
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					static int pm80x_rtc_read_time(struct device *dev, struct rtc_time *tm)
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					{
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						struct pm80x_rtc_info *info = dev_get_drvdata(dev);
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						unsigned char buf[4];
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						unsigned long ticks, base, data;
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						regmap_raw_read(info->map, PM800_RTC_EXPIRE2_1, buf, 4);
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						base = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
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						dev_dbg(info->dev, "%x-%x-%x-%x\n", buf[0], buf[1], buf[2], buf[3]);
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						/* load 32-bit read-only counter */
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						regmap_raw_read(info->map, PM800_RTC_COUNTER1, buf, 4);
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						data = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
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						ticks = base + data;
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						dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
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							base, data, ticks);
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						rtc_time_to_tm(ticks, tm);
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						return 0;
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					}
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					static int pm80x_rtc_set_time(struct device *dev, struct rtc_time *tm)
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					{
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						struct pm80x_rtc_info *info = dev_get_drvdata(dev);
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						unsigned char buf[4];
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						unsigned long ticks, base, data;
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						if ((tm->tm_year < 70) || (tm->tm_year > 138)) {
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							dev_dbg(info->dev,
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								"Set time %d out of range. Please set time between 1970 to 2038.\n",
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								1900 + tm->tm_year);
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							return -EINVAL;
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						}
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						rtc_tm_to_time(tm, &ticks);
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						/* load 32-bit read-only counter */
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						regmap_raw_read(info->map, PM800_RTC_COUNTER1, buf, 4);
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						data = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
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						base = ticks - data;
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						dev_dbg(info->dev, "set base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
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							base, data, ticks);
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						buf[0] = base & 0xFF;
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						buf[1] = (base >> 8) & 0xFF;
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						buf[2] = (base >> 16) & 0xFF;
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						buf[3] = (base >> 24) & 0xFF;
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						regmap_raw_write(info->map, PM800_RTC_EXPIRE2_1, buf, 4);
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						return 0;
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					}
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					static int pm80x_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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					{
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						struct pm80x_rtc_info *info = dev_get_drvdata(dev);
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						unsigned char buf[4];
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						unsigned long ticks, base, data;
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						int ret;
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						regmap_raw_read(info->map, PM800_RTC_EXPIRE2_1, buf, 4);
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						base = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
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						dev_dbg(info->dev, "%x-%x-%x-%x\n", buf[0], buf[1], buf[2], buf[3]);
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						regmap_raw_read(info->map, PM800_RTC_EXPIRE1_1, buf, 4);
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						data = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
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						ticks = base + data;
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						dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
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							base, data, ticks);
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						rtc_time_to_tm(ticks, &alrm->time);
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						regmap_read(info->map, PM800_RTC_CONTROL, &ret);
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						alrm->enabled = (ret & PM800_ALARM1_EN) ? 1 : 0;
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						alrm->pending = (ret & (PM800_ALARM | PM800_ALARM_WAKEUP)) ? 1 : 0;
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						return 0;
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					}
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					static int pm80x_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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					{
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						struct pm80x_rtc_info *info = dev_get_drvdata(dev);
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						struct rtc_time now_tm, alarm_tm;
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						unsigned long ticks, base, data;
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						unsigned char buf[4];
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						int mask;
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						regmap_update_bits(info->map, PM800_RTC_CONTROL, PM800_ALARM1_EN, 0);
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						regmap_raw_read(info->map, PM800_RTC_EXPIRE2_1, buf, 4);
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						base = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
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						dev_dbg(info->dev, "%x-%x-%x-%x\n", buf[0], buf[1], buf[2], buf[3]);
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						/* load 32-bit read-only counter */
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						regmap_raw_read(info->map, PM800_RTC_COUNTER1, buf, 4);
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						data = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
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						ticks = base + data;
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						dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
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							base, data, ticks);
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						rtc_time_to_tm(ticks, &now_tm);
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						dev_dbg(info->dev, "%s, now time : %lu\n", __func__, ticks);
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						rtc_next_alarm_time(&alarm_tm, &now_tm, &alrm->time);
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						/* get new ticks for alarm in 24 hours */
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						rtc_tm_to_time(&alarm_tm, &ticks);
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						dev_dbg(info->dev, "%s, alarm time: %lu\n", __func__, ticks);
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						data = ticks - base;
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						buf[0] = data & 0xff;
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						buf[1] = (data >> 8) & 0xff;
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						buf[2] = (data >> 16) & 0xff;
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						buf[3] = (data >> 24) & 0xff;
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						regmap_raw_write(info->map, PM800_RTC_EXPIRE1_1, buf, 4);
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						if (alrm->enabled) {
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							mask = PM800_ALARM | PM800_ALARM_WAKEUP | PM800_ALARM1_EN;
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							regmap_update_bits(info->map, PM800_RTC_CONTROL, mask, mask);
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						} else {
 | 
				
			||||||
 | 
							mask = PM800_ALARM | PM800_ALARM_WAKEUP | PM800_ALARM1_EN;
 | 
				
			||||||
 | 
							regmap_update_bits(info->map, PM800_RTC_CONTROL, mask,
 | 
				
			||||||
 | 
									   PM800_ALARM | PM800_ALARM_WAKEUP);
 | 
				
			||||||
 | 
						}
 | 
				
			||||||
 | 
						return 0;
 | 
				
			||||||
 | 
					}
 | 
				
			||||||
 | 
					
 | 
				
			||||||
 | 
					static const struct rtc_class_ops pm80x_rtc_ops = {
 | 
				
			||||||
 | 
						.read_time = pm80x_rtc_read_time,
 | 
				
			||||||
 | 
						.set_time = pm80x_rtc_set_time,
 | 
				
			||||||
 | 
						.read_alarm = pm80x_rtc_read_alarm,
 | 
				
			||||||
 | 
						.set_alarm = pm80x_rtc_set_alarm,
 | 
				
			||||||
 | 
						.alarm_irq_enable = pm80x_rtc_alarm_irq_enable,
 | 
				
			||||||
 | 
					};
 | 
				
			||||||
 | 
					
 | 
				
			||||||
 | 
					#ifdef CONFIG_PM
 | 
				
			||||||
 | 
					static int pm80x_rtc_suspend(struct device *dev)
 | 
				
			||||||
 | 
					{
 | 
				
			||||||
 | 
						return pm80x_dev_suspend(dev);
 | 
				
			||||||
 | 
					}
 | 
				
			||||||
 | 
					
 | 
				
			||||||
 | 
					static int pm80x_rtc_resume(struct device *dev)
 | 
				
			||||||
 | 
					{
 | 
				
			||||||
 | 
						return pm80x_dev_resume(dev);
 | 
				
			||||||
 | 
					}
 | 
				
			||||||
 | 
					#endif
 | 
				
			||||||
 | 
					
 | 
				
			||||||
 | 
					static SIMPLE_DEV_PM_OPS(pm80x_rtc_pm_ops, pm80x_rtc_suspend, pm80x_rtc_resume);
 | 
				
			||||||
 | 
					
 | 
				
			||||||
 | 
					static int __devinit pm80x_rtc_probe(struct platform_device *pdev)
 | 
				
			||||||
 | 
					{
 | 
				
			||||||
 | 
						struct pm80x_chip *chip = dev_get_drvdata(pdev->dev.parent);
 | 
				
			||||||
 | 
						struct pm80x_platform_data *pm80x_pdata;
 | 
				
			||||||
 | 
						struct pm80x_rtc_pdata *pdata = NULL;
 | 
				
			||||||
 | 
						struct pm80x_rtc_info *info;
 | 
				
			||||||
 | 
						struct rtc_time tm;
 | 
				
			||||||
 | 
						unsigned long ticks = 0;
 | 
				
			||||||
 | 
						int ret;
 | 
				
			||||||
 | 
					
 | 
				
			||||||
 | 
						pdata = pdev->dev.platform_data;
 | 
				
			||||||
 | 
						if (pdata == NULL)
 | 
				
			||||||
 | 
							dev_warn(&pdev->dev, "No platform data!\n");
 | 
				
			||||||
 | 
					
 | 
				
			||||||
 | 
						info =
 | 
				
			||||||
 | 
						    devm_kzalloc(&pdev->dev, sizeof(struct pm80x_rtc_info), GFP_KERNEL);
 | 
				
			||||||
 | 
						if (!info)
 | 
				
			||||||
 | 
							return -ENOMEM;
 | 
				
			||||||
 | 
						info->irq = platform_get_irq(pdev, 0);
 | 
				
			||||||
 | 
						if (info->irq < 0) {
 | 
				
			||||||
 | 
							dev_err(&pdev->dev, "No IRQ resource!\n");
 | 
				
			||||||
 | 
							ret = -EINVAL;
 | 
				
			||||||
 | 
							goto out;
 | 
				
			||||||
 | 
						}
 | 
				
			||||||
 | 
					
 | 
				
			||||||
 | 
						info->chip = chip;
 | 
				
			||||||
 | 
						info->map = chip->regmap;
 | 
				
			||||||
 | 
						if (!info->map) {
 | 
				
			||||||
 | 
							dev_err(&pdev->dev, "no regmap!\n");
 | 
				
			||||||
 | 
							ret = -EINVAL;
 | 
				
			||||||
 | 
							goto out;
 | 
				
			||||||
 | 
						}
 | 
				
			||||||
 | 
					
 | 
				
			||||||
 | 
						info->dev = &pdev->dev;
 | 
				
			||||||
 | 
						dev_set_drvdata(&pdev->dev, info);
 | 
				
			||||||
 | 
					
 | 
				
			||||||
 | 
						ret = pm80x_request_irq(chip, info->irq, rtc_update_handler,
 | 
				
			||||||
 | 
									IRQF_ONESHOT, "rtc", info);
 | 
				
			||||||
 | 
						if (ret < 0) {
 | 
				
			||||||
 | 
							dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
 | 
				
			||||||
 | 
								info->irq, ret);
 | 
				
			||||||
 | 
							goto out;
 | 
				
			||||||
 | 
						}
 | 
				
			||||||
 | 
					
 | 
				
			||||||
 | 
						ret = pm80x_rtc_read_time(&pdev->dev, &tm);
 | 
				
			||||||
 | 
						if (ret < 0) {
 | 
				
			||||||
 | 
							dev_err(&pdev->dev, "Failed to read initial time.\n");
 | 
				
			||||||
 | 
							goto out_rtc;
 | 
				
			||||||
 | 
						}
 | 
				
			||||||
 | 
						if ((tm.tm_year < 70) || (tm.tm_year > 138)) {
 | 
				
			||||||
 | 
							tm.tm_year = 70;
 | 
				
			||||||
 | 
							tm.tm_mon = 0;
 | 
				
			||||||
 | 
							tm.tm_mday = 1;
 | 
				
			||||||
 | 
							tm.tm_hour = 0;
 | 
				
			||||||
 | 
							tm.tm_min = 0;
 | 
				
			||||||
 | 
							tm.tm_sec = 0;
 | 
				
			||||||
 | 
							ret = pm80x_rtc_set_time(&pdev->dev, &tm);
 | 
				
			||||||
 | 
							if (ret < 0) {
 | 
				
			||||||
 | 
								dev_err(&pdev->dev, "Failed to set initial time.\n");
 | 
				
			||||||
 | 
								goto out_rtc;
 | 
				
			||||||
 | 
							}
 | 
				
			||||||
 | 
						}
 | 
				
			||||||
 | 
						rtc_tm_to_time(&tm, &ticks);
 | 
				
			||||||
 | 
					
 | 
				
			||||||
 | 
						info->rtc_dev = rtc_device_register("88pm80x-rtc", &pdev->dev,
 | 
				
			||||||
 | 
										    &pm80x_rtc_ops, THIS_MODULE);
 | 
				
			||||||
 | 
						ret = PTR_ERR(info->rtc_dev);
 | 
				
			||||||
 | 
						if (IS_ERR(info->rtc_dev)) {
 | 
				
			||||||
 | 
							dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
 | 
				
			||||||
 | 
							goto out_rtc;
 | 
				
			||||||
 | 
						}
 | 
				
			||||||
 | 
						/*
 | 
				
			||||||
 | 
						 * enable internal XO instead of internal 3.25MHz clock since it can
 | 
				
			||||||
 | 
						 * free running in PMIC power-down state.
 | 
				
			||||||
 | 
						 */
 | 
				
			||||||
 | 
						regmap_update_bits(info->map, PM800_RTC_CONTROL, PM800_RTC1_USE_XO,
 | 
				
			||||||
 | 
								   PM800_RTC1_USE_XO);
 | 
				
			||||||
 | 
					
 | 
				
			||||||
 | 
						if (pdev->dev.parent->platform_data) {
 | 
				
			||||||
 | 
							pm80x_pdata = pdev->dev.parent->platform_data;
 | 
				
			||||||
 | 
							pdata = pm80x_pdata->rtc;
 | 
				
			||||||
 | 
							if (pdata)
 | 
				
			||||||
 | 
								info->rtc_dev->dev.platform_data = &pdata->rtc_wakeup;
 | 
				
			||||||
 | 
						}
 | 
				
			||||||
 | 
					
 | 
				
			||||||
 | 
						device_init_wakeup(&pdev->dev, 1);
 | 
				
			||||||
 | 
					
 | 
				
			||||||
 | 
						return 0;
 | 
				
			||||||
 | 
					out_rtc:
 | 
				
			||||||
 | 
						pm80x_free_irq(chip, info->irq, info);
 | 
				
			||||||
 | 
					out:
 | 
				
			||||||
 | 
						devm_kfree(&pdev->dev, info);
 | 
				
			||||||
 | 
						return ret;
 | 
				
			||||||
 | 
					}
 | 
				
			||||||
 | 
					
 | 
				
			||||||
 | 
					static int __devexit pm80x_rtc_remove(struct platform_device *pdev)
 | 
				
			||||||
 | 
					{
 | 
				
			||||||
 | 
						struct pm80x_rtc_info *info = platform_get_drvdata(pdev);
 | 
				
			||||||
 | 
						platform_set_drvdata(pdev, NULL);
 | 
				
			||||||
 | 
						rtc_device_unregister(info->rtc_dev);
 | 
				
			||||||
 | 
						pm80x_free_irq(info->chip, info->irq, info);
 | 
				
			||||||
 | 
						devm_kfree(&pdev->dev, info);
 | 
				
			||||||
 | 
						return 0;
 | 
				
			||||||
 | 
					}
 | 
				
			||||||
 | 
					
 | 
				
			||||||
 | 
					static struct platform_driver pm80x_rtc_driver = {
 | 
				
			||||||
 | 
						.driver = {
 | 
				
			||||||
 | 
							   .name = "88pm80x-rtc",
 | 
				
			||||||
 | 
							   .owner = THIS_MODULE,
 | 
				
			||||||
 | 
							   .pm = &pm80x_rtc_pm_ops,
 | 
				
			||||||
 | 
							   },
 | 
				
			||||||
 | 
						.probe = pm80x_rtc_probe,
 | 
				
			||||||
 | 
						.remove = __devexit_p(pm80x_rtc_remove),
 | 
				
			||||||
 | 
					};
 | 
				
			||||||
 | 
					
 | 
				
			||||||
 | 
					module_platform_driver(pm80x_rtc_driver);
 | 
				
			||||||
 | 
					
 | 
				
			||||||
 | 
					MODULE_LICENSE("GPL");
 | 
				
			||||||
 | 
					MODULE_DESCRIPTION("Marvell 88PM80x RTC driver");
 | 
				
			||||||
 | 
					MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>");
 | 
				
			||||||
 | 
					MODULE_ALIAS("platform:88pm80x-rtc");
 | 
				
			||||||
		Loading…
	
		Reference in a new issue