diff options
Diffstat (limited to 'drivers/mfd/ab8500-sysctrl.c')
| -rw-r--r-- | drivers/mfd/ab8500-sysctrl.c | 100 |
1 files changed, 88 insertions, 12 deletions
diff --git a/drivers/mfd/ab8500-sysctrl.c b/drivers/mfd/ab8500-sysctrl.c index 108fd86552f..fbca1ced49f 100644 --- a/drivers/mfd/ab8500-sysctrl.c +++ b/drivers/mfd/ab8500-sysctrl.c @@ -15,19 +15,30 @@ #include <linux/mfd/abx500/ab8500.h> #include <linux/mfd/abx500/ab8500-sysctrl.h> +/* RtcCtrl bits */ +#define AB8500_ALARM_MIN_LOW 0x08 +#define AB8500_ALARM_MIN_MID 0x09 +#define RTC_CTRL 0x0B +#define RTC_ALARM_ENABLE 0x4 + static struct device *sysctrl_dev; void ab8500_power_off(void) { sigset_t old; sigset_t all; - static char *pss[] = {"ab8500_ac", "ab8500_usb"}; + static char *pss[] = {"ab8500_ac", "pm2301", "ab8500_usb"}; int i; bool charger_present = false; union power_supply_propval val; struct power_supply *psy; int ret; + if (sysctrl_dev == NULL) { + pr_err("%s: sysctrl not initialized\n", __func__); + return; + } + /* * If we have a charger connected and we're powering off, * reboot into charge-only mode. @@ -74,6 +85,63 @@ shutdown: } } +/* + * Use the AB WD to reset the platform. It will perform a hard + * reset instead of a soft reset. Write the reset reason to + * the AB before reset, which can be read upon restart. + */ +void ab8500_restart(char mode, const char *cmd) +{ + struct ab8500_platform_data *plat; + struct ab8500_sysctrl_platform_data *pdata; + u16 reason = 0; + u8 val; + + if (sysctrl_dev == NULL) { + pr_err("%s: sysctrl not initialized\n", __func__); + return; + } + + plat = dev_get_platdata(sysctrl_dev->parent); + pdata = plat->sysctrl; + if (pdata->reboot_reason_code) + reason = pdata->reboot_reason_code(cmd); + else + pr_warn("[%s] No reboot reason set. Default reason %d\n", + __func__, reason); + + /* + * Disable RTC alarm, just a precaution so that no alarm + * is running when WD reset is executed. + */ + abx500_get_register_interruptible(sysctrl_dev, AB8500_RTC, + RTC_CTRL , &val); + abx500_set_register_interruptible(sysctrl_dev, AB8500_RTC, + RTC_CTRL , (val & ~RTC_ALARM_ENABLE)); + + /* + * Android is not using the RTC alarm registers during reboot + * so we borrow them for writing the reason of reset + */ + + /* reason[8 LSB] */ + val = reason & 0xFF; + abx500_set_register_interruptible(sysctrl_dev, AB8500_RTC, + AB8500_ALARM_MIN_LOW , val); + + /* reason[8 MSB] */ + val = (reason>>8) & 0xFF; + abx500_set_register_interruptible(sysctrl_dev, AB8500_RTC, + AB8500_ALARM_MIN_MID , val); + + /* Setting WD timeout to 0 */ + ab8500_sysctrl_write(AB8500_MAINWDOGTIMER, 0xFF, 0x0); + + /* Setting the parameters to AB8500 WD*/ + ab8500_sysctrl_write(AB8500_MAINWDOGCTRL, 0xFF, (AB8500_ENABLE_WD | + AB8500_WD_RESTART_ON_EXPIRE | AB8500_KICK_WD)); +} + static inline bool valid_bank(u8 bank) { return ((bank == AB8500_SYS_CTRL1_BLOCK) || @@ -85,7 +153,7 @@ int ab8500_sysctrl_read(u16 reg, u8 *value) u8 bank; if (sysctrl_dev == NULL) - return -EAGAIN; + return -EINVAL; bank = (reg >> 8); if (!valid_bank(bank)) @@ -101,7 +169,7 @@ int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value) u8 bank; if (sysctrl_dev == NULL) - return -EAGAIN; + return -EINVAL; bank = (reg >> 8); if (!valid_bank(bank)) @@ -114,28 +182,36 @@ EXPORT_SYMBOL(ab8500_sysctrl_write); static int ab8500_sysctrl_probe(struct platform_device *pdev) { + struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent); struct ab8500_platform_data *plat; struct ab8500_sysctrl_platform_data *pdata; - sysctrl_dev = &pdev->dev; plat = dev_get_platdata(pdev->dev.parent); + + if (!(plat && plat->sysctrl)) + return -EINVAL; + if (plat->pm_power_off) pm_power_off = ab8500_power_off; pdata = plat->sysctrl; if (pdata) { - int ret, i, j; + int last, ret, i, j; + + if (is_ab8505(ab8500)) + last = AB8500_SYSCLKREQ4RFCLKBUF; + else + last = AB8500_SYSCLKREQ8RFCLKBUF; - for (i = AB8500_SYSCLKREQ1RFCLKBUF; - i <= AB8500_SYSCLKREQ8RFCLKBUF; i++) { + for (i = AB8500_SYSCLKREQ1RFCLKBUF; i <= last; i++) { j = i - AB8500_SYSCLKREQ1RFCLKBUF; ret = ab8500_sysctrl_write(i, 0xff, - pdata->initial_req_buf_config[j]); + pdata->initial_req_buf_config[j]); dev_dbg(&pdev->dev, - "Setting SysClkReq%dRfClkBuf 0x%X\n", - j + 1, - pdata->initial_req_buf_config[j]); + "Setting SysClkReq%dRfClkBuf 0x%X\n", + j + 1, + pdata->initial_req_buf_config[j]); if (ret < 0) { dev_err(&pdev->dev, "unable to set sysClkReq%dRfClkBuf: " @@ -166,7 +242,7 @@ static int __init ab8500_sysctrl_init(void) { return platform_driver_register(&ab8500_sysctrl_driver); } -subsys_initcall(ab8500_sysctrl_init); +arch_initcall(ab8500_sysctrl_init); MODULE_AUTHOR("Mattias Nilsson <mattias.i.nilsson@stericsson.com"); MODULE_DESCRIPTION("AB8500 system control driver"); |