//
// Copyright (C) 2018 ROHM Semiconductors
//
-// RTC driver for ROHM BD70528 PMIC
+// RTC driver for ROHM BD71828 and BD71815 PMIC
#include <linux/bcd.h>
-#include <linux/mfd/rohm-bd70528.h>
#include <linux/mfd/rohm-bd71815.h>
#include <linux/mfd/rohm-bd71828.h>
#include <linux/module.h>
u8 year;
} __packed;
-struct bd70528_rtc_wake {
- struct bd70528_rtc_day time;
- u8 ctrl;
-} __packed;
-
struct bd71828_rtc_alm {
struct bd70528_rtc_data alm0;
struct bd70528_rtc_data alm1;
u8 alm1_mask;
} __packed;
-struct bd70528_rtc_alm {
- struct bd70528_rtc_data data;
- u8 alm_mask;
- u8 alm_repeat;
-} __packed;
-
struct bd70528_rtc {
struct rohm_regmap_dev *parent;
struct regmap *regmap;
struct device *dev;
u8 reg_time_start;
u8 bd718xx_alm_block_start;
- bool has_rtc_timers;
};
-static int bd70528_set_wake(struct rohm_regmap_dev *bd70528,
- int enable, int *old_state)
-{
- int ret;
- unsigned int ctrl_reg;
-
- ret = regmap_read(bd70528->regmap, BD70528_REG_WAKE_EN, &ctrl_reg);
- if (ret)
- return ret;
-
- if (old_state) {
- if (ctrl_reg & BD70528_MASK_WAKE_EN)
- *old_state |= BD70528_WAKE_STATE_BIT;
- else
- *old_state &= ~BD70528_WAKE_STATE_BIT;
-
- if (!enable == !(*old_state & BD70528_WAKE_STATE_BIT))
- return 0;
- }
-
- if (enable)
- ctrl_reg |= BD70528_MASK_WAKE_EN;
- else
- ctrl_reg &= ~BD70528_MASK_WAKE_EN;
-
- return regmap_write(bd70528->regmap, BD70528_REG_WAKE_EN,
- ctrl_reg);
-}
-
-static int bd70528_set_elapsed_tmr(struct rohm_regmap_dev *bd70528,
- int enable, int *old_state)
-{
- int ret;
- unsigned int ctrl_reg;
-
- /*
- * TBD
- * What is the purpose of elapsed timer ?
- * Is the timeout registers counting down, or is the disable - re-enable
- * going to restart the elapsed-time counting? If counting is restarted
- * the timeout should be decreased by the amount of time that has
- * elapsed since starting the timer. Maybe we should store the monotonic
- * clock value when timer is started so that if RTC is set while timer
- * is armed we could do the compensation. This is a hack if RTC/system
- * clk are drifting. OTOH, RTC controlled via I2C is in any case
- * inaccurate...
- */
- ret = regmap_read(bd70528->regmap, BD70528_REG_ELAPSED_TIMER_EN,
- &ctrl_reg);
- if (ret)
- return ret;
-
- if (old_state) {
- if (ctrl_reg & BD70528_MASK_ELAPSED_TIMER_EN)
- *old_state |= BD70528_ELAPSED_STATE_BIT;
- else
- *old_state &= ~BD70528_ELAPSED_STATE_BIT;
-
- if ((!enable) == (!(*old_state & BD70528_ELAPSED_STATE_BIT)))
- return 0;
- }
-
- if (enable)
- ctrl_reg |= BD70528_MASK_ELAPSED_TIMER_EN;
- else
- ctrl_reg &= ~BD70528_MASK_ELAPSED_TIMER_EN;
-
- return regmap_write(bd70528->regmap, BD70528_REG_ELAPSED_TIMER_EN,
- ctrl_reg);
-}
-
-static int bd70528_set_rtc_based_timers(struct bd70528_rtc *r, int new_state,
- int *old_state)
-{
- int ret;
-
- ret = bd70528_wdt_set(r->parent, new_state & BD70528_WDT_STATE_BIT,
- old_state);
- if (ret) {
- dev_err(r->dev,
- "Failed to disable WDG for RTC setting (%d)\n", ret);
- return ret;
- }
- ret = bd70528_set_elapsed_tmr(r->parent,
- new_state & BD70528_ELAPSED_STATE_BIT,
- old_state);
- if (ret) {
- dev_err(r->dev,
- "Failed to disable 'elapsed timer' for RTC setting\n");
- return ret;
- }
- ret = bd70528_set_wake(r->parent, new_state & BD70528_WAKE_STATE_BIT,
- old_state);
- if (ret) {
- dev_err(r->dev,
- "Failed to disable 'wake timer' for RTC setting\n");
- return ret;
- }
-
- return ret;
-}
-
-static int bd70528_re_enable_rtc_based_timers(struct bd70528_rtc *r,
- int old_state)
-{
- if (!r->has_rtc_timers)
- return 0;
-
- return bd70528_set_rtc_based_timers(r, old_state, NULL);
-}
-
-static int bd70528_disable_rtc_based_timers(struct bd70528_rtc *r,
- int *old_state)
-{
- if (!r->has_rtc_timers)
- return 0;
-
- return bd70528_set_rtc_based_timers(r, 0, old_state);
-}
-
static inline void tmday2rtc(struct rtc_time *t, struct bd70528_rtc_day *d)
{
d->sec &= ~BD70528_MASK_RTC_SEC;
}
-static int bd70528_set_alarm(struct device *dev, struct rtc_wkalrm *a)
-{
- struct bd70528_rtc_wake wake;
- struct bd70528_rtc_alm alm;
- int ret;
- struct bd70528_rtc *r = dev_get_drvdata(dev);
-
- ret = regmap_bulk_read(r->regmap, BD70528_REG_RTC_WAKE_START, &wake,
- sizeof(wake));
- if (ret) {
- dev_err(dev, "Failed to read wake regs\n");
- return ret;
- }
-
- ret = regmap_bulk_read(r->regmap, BD70528_REG_RTC_ALM_START, &alm,
- sizeof(alm));
- if (ret) {
- dev_err(dev, "Failed to read alarm regs\n");
- return ret;
- }
-
- tm2rtc(&a->time, &alm.data);
- tmday2rtc(&a->time, &wake.time);
-
- if (a->enabled) {
- alm.alm_mask &= ~BD70528_MASK_ALM_EN;
- wake.ctrl |= BD70528_MASK_WAKE_EN;
- } else {
- alm.alm_mask |= BD70528_MASK_ALM_EN;
- wake.ctrl &= ~BD70528_MASK_WAKE_EN;
- }
-
- ret = regmap_bulk_write(r->regmap, BD70528_REG_RTC_WAKE_START, &wake,
- sizeof(wake));
- if (ret) {
- dev_err(dev, "Failed to set wake time\n");
- return ret;
- }
- ret = regmap_bulk_write(r->regmap, BD70528_REG_RTC_ALM_START, &alm,
- sizeof(alm));
- if (ret)
- dev_err(dev, "Failed to set alarm time\n");
-
- return ret;
-}
-
static int bd71828_read_alarm(struct device *dev, struct rtc_wkalrm *a)
{
int ret;
return 0;
}
-static int bd70528_read_alarm(struct device *dev, struct rtc_wkalrm *a)
+static int bd71828_set_time(struct device *dev, struct rtc_time *t)
{
- struct bd70528_rtc_alm alm;
int ret;
- struct bd70528_rtc *r = dev_get_drvdata(dev);
-
- ret = regmap_bulk_read(r->regmap, BD70528_REG_RTC_ALM_START, &alm,
- sizeof(alm));
- if (ret) {
- dev_err(dev, "Failed to read alarm regs\n");
- return ret;
- }
-
- rtc2tm(&alm.data, &a->time);
- a->time.tm_mday = -1;
- a->time.tm_mon = -1;
- a->time.tm_year = -1;
- a->enabled = !(alm.alm_mask & BD70528_MASK_ALM_EN);
- a->pending = 0;
-
- return 0;
-}
-
-static int bd70528_set_time_locked(struct device *dev, struct rtc_time *t)
-{
- int ret, tmpret, old_states;
struct bd70528_rtc_data rtc_data;
struct bd70528_rtc *r = dev_get_drvdata(dev);
- ret = bd70528_disable_rtc_based_timers(r, &old_states);
- if (ret)
- return ret;
-
- tmpret = regmap_bulk_read(r->regmap, r->reg_time_start, &rtc_data,
- sizeof(rtc_data));
- if (tmpret) {
+ ret = regmap_bulk_read(r->regmap, r->reg_time_start, &rtc_data,
+ sizeof(rtc_data));
+ if (ret) {
dev_err(dev, "Failed to read RTC time registers\n");
- goto renable_out;
+ return ret;
}
tm2rtc(t, &rtc_data);
- tmpret = regmap_bulk_write(r->regmap, r->reg_time_start, &rtc_data,
- sizeof(rtc_data));
- if (tmpret) {
+ ret = regmap_bulk_write(r->regmap, r->reg_time_start, &rtc_data,
+ sizeof(rtc_data));
+ if (ret)
dev_err(dev, "Failed to set RTC time\n");
- goto renable_out;
- }
-
-renable_out:
- ret = bd70528_re_enable_rtc_based_timers(r, old_states);
- if (tmpret)
- ret = tmpret;
return ret;
}
-static int bd71828_set_time(struct device *dev, struct rtc_time *t)
-{
- return bd70528_set_time_locked(dev, t);
-}
-
-static int bd70528_set_time(struct device *dev, struct rtc_time *t)
-{
- int ret;
- struct bd70528_rtc *r = dev_get_drvdata(dev);
-
- bd70528_wdt_lock(r->parent);
- ret = bd70528_set_time_locked(dev, t);
- bd70528_wdt_unlock(r->parent);
- return ret;
-}
-
static int bd70528_get_time(struct device *dev, struct rtc_time *t)
{
struct bd70528_rtc *r = dev_get_drvdata(dev);
return 0;
}
-static int bd70528_alm_enable(struct device *dev, unsigned int enabled)
-{
- int ret;
- unsigned int enableval = BD70528_MASK_ALM_EN;
- struct bd70528_rtc *r = dev_get_drvdata(dev);
-
- if (enabled)
- enableval = 0;
-
- bd70528_wdt_lock(r->parent);
- ret = bd70528_set_wake(r->parent, enabled, NULL);
- if (ret) {
- dev_err(dev, "Failed to change wake state\n");
- goto out_unlock;
- }
- ret = regmap_update_bits(r->regmap, BD70528_REG_RTC_ALM_MASK,
- BD70528_MASK_ALM_EN, enableval);
- if (ret)
- dev_err(dev, "Failed to change alarm state\n");
-
-out_unlock:
- bd70528_wdt_unlock(r->parent);
- return ret;
-}
-
static int bd71828_alm_enable(struct device *dev, unsigned int enabled)
{
int ret;
return ret;
}
-static const struct rtc_class_ops bd70528_rtc_ops = {
- .read_time = bd70528_get_time,
- .set_time = bd70528_set_time,
- .read_alarm = bd70528_read_alarm,
- .set_alarm = bd70528_set_alarm,
- .alarm_irq_enable = bd70528_alm_enable,
-};
-
static const struct rtc_class_ops bd71828_rtc_ops = {
.read_time = bd70528_get_time,
.set_time = bd71828_set_time,
struct rtc_device *rtc;
int irq;
unsigned int hr;
- bool enable_main_irq = false;
u8 hour_reg;
enum rohm_chip_type chip = platform_get_device_id(pdev)->driver_data;
}
bd_rtc->dev = &pdev->dev;
+ rtc_ops = &bd71828_rtc_ops;
switch (chip) {
- case ROHM_CHIP_TYPE_BD70528:
- bd_rtc->parent = dev_get_drvdata(pdev->dev.parent);
- if (!bd_rtc->parent) {
- dev_err(&pdev->dev, "No MFD data\n");
- return -EINVAL;
- }
- irq_name = "bd70528-rtc-alm";
- bd_rtc->has_rtc_timers = true;
- bd_rtc->reg_time_start = BD70528_REG_RTC_START;
- hour_reg = BD70528_REG_RTC_HOUR;
- enable_main_irq = true;
- rtc_ops = &bd70528_rtc_ops;
- break;
case ROHM_CHIP_TYPE_BD71815:
irq_name = "bd71815-rtc-alm-0";
bd_rtc->reg_time_start = BD71815_REG_RTC_START;
*/
bd_rtc->bd718xx_alm_block_start = BD71815_REG_RTC_ALM_START;
hour_reg = BD71815_REG_HOUR;
- rtc_ops = &bd71828_rtc_ops;
break;
case ROHM_CHIP_TYPE_BD71828:
irq_name = "bd71828-rtc-alm-0";
bd_rtc->reg_time_start = BD71828_REG_RTC_START;
bd_rtc->bd718xx_alm_block_start = BD71828_REG_RTC_ALM_START;
hour_reg = BD71828_REG_RTC_HOUR;
- rtc_ops = &bd71828_rtc_ops;
break;
default:
dev_err(&pdev->dev, "Unknown chip\n");
if (ret)
return ret;
- /*
- * BD70528 irq controller is not touching the main mask register.
- * So enable the RTC block interrupts at main level. We can just
- * leave them enabled as irq-controller should disable irqs
- * from sub-registers when IRQ is disabled or freed.
- */
- if (enable_main_irq) {
- ret = regmap_update_bits(bd_rtc->regmap,
- BD70528_REG_INT_MAIN_MASK,
- BD70528_INT_RTC_MASK, 0);
- if (ret) {
- dev_err(&pdev->dev, "Failed to enable RTC interrupts\n");
- return ret;
- }
- }
-
return devm_rtc_register_device(rtc);
}
static const struct platform_device_id bd718x7_rtc_id[] = {
- { "bd70528-rtc", ROHM_CHIP_TYPE_BD70528 },
{ "bd71828-rtc", ROHM_CHIP_TYPE_BD71828 },
{ "bd71815-rtc", ROHM_CHIP_TYPE_BD71815 },
{ },
module_platform_driver(bd70528_rtc);
MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
-MODULE_DESCRIPTION("ROHM BD70528 and BD71828 PMIC RTC driver");
+MODULE_DESCRIPTION("ROHM BD71828 and BD71815 PMIC RTC driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:bd70528-rtc");
projects / linux-2.6-microblaze.git / blobdiff