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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>
This commit is contained in:
Qiao Zhou
Samuel Ortiz
parent
af65a361d5
commit
2985c29c19
@ -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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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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tristate "Dallas/Maxim DS1307/37/38/39/40, ST M41T00, EPSON RX-8025"
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help
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@ -16,6 +16,7 @@ rtc-core-$(CONFIG_RTC_INTF_SYSFS) += rtc-sysfs.o
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# Keep the list ordered.
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obj-$(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-$(CONFIG_RTC_DRV_AB8500) += rtc-ab8500.o
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obj-$(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
@ -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 {
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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,
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PM800_ALARM | PM800_ALARM_WAKEUP);
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}
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return 0;
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}
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static const struct rtc_class_ops pm80x_rtc_ops = {
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.read_time = pm80x_rtc_read_time,
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.set_time = pm80x_rtc_set_time,
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.read_alarm = pm80x_rtc_read_alarm,
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.set_alarm = pm80x_rtc_set_alarm,
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.alarm_irq_enable = pm80x_rtc_alarm_irq_enable,
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};
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#ifdef CONFIG_PM
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static int pm80x_rtc_suspend(struct device *dev)
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{
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return pm80x_dev_suspend(dev);
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}
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static int pm80x_rtc_resume(struct device *dev)
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{
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return pm80x_dev_resume(dev);
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}
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#endif
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static SIMPLE_DEV_PM_OPS(pm80x_rtc_pm_ops, pm80x_rtc_suspend, pm80x_rtc_resume);
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static int __devinit pm80x_rtc_probe(struct platform_device *pdev)
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{
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struct pm80x_chip *chip = dev_get_drvdata(pdev->dev.parent);
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struct pm80x_platform_data *pm80x_pdata;
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struct pm80x_rtc_pdata *pdata = NULL;
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struct pm80x_rtc_info *info;
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struct rtc_time tm;
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unsigned long ticks = 0;
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int ret;
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pdata = pdev->dev.platform_data;
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if (pdata == NULL)
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dev_warn(&pdev->dev, "No platform data!\n");
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info =
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devm_kzalloc(&pdev->dev, sizeof(struct pm80x_rtc_info), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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info->irq = platform_get_irq(pdev, 0);
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if (info->irq < 0) {
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dev_err(&pdev->dev, "No IRQ resource!\n");
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ret = -EINVAL;
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goto out;
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}
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info->chip = chip;
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info->map = chip->regmap;
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if (!info->map) {
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dev_err(&pdev->dev, "no regmap!\n");
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ret = -EINVAL;
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goto out;
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}
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info->dev = &pdev->dev;
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dev_set_drvdata(&pdev->dev, info);
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ret = pm80x_request_irq(chip, info->irq, rtc_update_handler,
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IRQF_ONESHOT, "rtc", info);
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if (ret < 0) {
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dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
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info->irq, ret);
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goto out;
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}
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ret = pm80x_rtc_read_time(&pdev->dev, &tm);
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if (ret < 0) {
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dev_err(&pdev->dev, "Failed to read initial time.\n");
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goto out_rtc;
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}
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if ((tm.tm_year < 70) || (tm.tm_year > 138)) {
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tm.tm_year = 70;
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tm.tm_mon = 0;
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tm.tm_mday = 1;
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tm.tm_hour = 0;
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tm.tm_min = 0;
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tm.tm_sec = 0;
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ret = pm80x_rtc_set_time(&pdev->dev, &tm);
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if (ret < 0) {
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dev_err(&pdev->dev, "Failed to set initial time.\n");
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goto out_rtc;
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}
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}
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rtc_tm_to_time(&tm, &ticks);
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info->rtc_dev = rtc_device_register("88pm80x-rtc", &pdev->dev,
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&pm80x_rtc_ops, THIS_MODULE);
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ret = PTR_ERR(info->rtc_dev);
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if (IS_ERR(info->rtc_dev)) {
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dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
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goto out_rtc;
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}
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/*
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* enable internal XO instead of internal 3.25MHz clock since it can
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* free running in PMIC power-down state.
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*/
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regmap_update_bits(info->map, PM800_RTC_CONTROL, PM800_RTC1_USE_XO,
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PM800_RTC1_USE_XO);
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if (pdev->dev.parent->platform_data) {
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pm80x_pdata = pdev->dev.parent->platform_data;
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pdata = pm80x_pdata->rtc;
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if (pdata)
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info->rtc_dev->dev.platform_data = &pdata->rtc_wakeup;
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}
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device_init_wakeup(&pdev->dev, 1);
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return 0;
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out_rtc:
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pm80x_free_irq(chip, info->irq, info);
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out:
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devm_kfree(&pdev->dev, info);
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return ret;
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}
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static int __devexit pm80x_rtc_remove(struct platform_device *pdev)
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{
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struct pm80x_rtc_info *info = platform_get_drvdata(pdev);
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platform_set_drvdata(pdev, NULL);
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rtc_device_unregister(info->rtc_dev);
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pm80x_free_irq(info->chip, info->irq, info);
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devm_kfree(&pdev->dev, info);
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return 0;
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}
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static struct platform_driver pm80x_rtc_driver = {
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.driver = {
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.name = "88pm80x-rtc",
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.owner = THIS_MODULE,
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.pm = &pm80x_rtc_pm_ops,
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},
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.probe = pm80x_rtc_probe,
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.remove = __devexit_p(pm80x_rtc_remove),
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};
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module_platform_driver(pm80x_rtc_driver);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Marvell 88PM80x RTC driver");
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MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>");
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MODULE_ALIAS("platform:88pm80x-rtc");
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