diff options
Diffstat (limited to 'drivers/mfd/ab8500-sysctrl.c')
| -rw-r--r-- | drivers/mfd/ab8500-sysctrl.c | 254 |
1 files changed, 254 insertions, 0 deletions
diff --git a/drivers/mfd/ab8500-sysctrl.c b/drivers/mfd/ab8500-sysctrl.c new file mode 100644 index 00000000000..8e0dae59844 --- /dev/null +++ b/drivers/mfd/ab8500-sysctrl.c @@ -0,0 +1,254 @@ +/* + * Copyright (C) ST-Ericsson SA 2010 + * Author: Mattias Nilsson <mattias.i.nilsson@stericsson.com> for ST Ericsson. + * License terms: GNU General Public License (GPL) version 2 + */ + +#include <linux/err.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/pm.h> +#include <linux/reboot.h> +#include <linux/signal.h> +#include <linux/power_supply.h> +#include <linux/mfd/abx500.h> +#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; + +static void ab8500_power_off(void) +{ + sigset_t old; + sigset_t all; + 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. + */ + + for (i = 0; i < ARRAY_SIZE(pss); i++) { + psy = power_supply_get_by_name(pss[i]); + if (!psy) + continue; + + ret = psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &val); + + if (!ret && val.intval) { + charger_present = true; + break; + } + } + + if (!charger_present) + goto shutdown; + + /* Check if battery is known */ + psy = power_supply_get_by_name("ab8500_btemp"); + if (psy) { + ret = psy->get_property(psy, POWER_SUPPLY_PROP_TECHNOLOGY, + &val); + if (!ret && val.intval != POWER_SUPPLY_TECHNOLOGY_UNKNOWN) { + printk(KERN_INFO + "Charger \"%s\" is connected with known battery." + " Rebooting.\n", + pss[i]); + machine_restart("charging"); + } + } + +shutdown: + sigfillset(&all); + + if (!sigprocmask(SIG_BLOCK, &all, &old)) { + (void)ab8500_sysctrl_set(AB8500_STW4500CTRL1, + AB8500_STW4500CTRL1_SWOFF | + AB8500_STW4500CTRL1_SWRESET4500N); + (void)sigprocmask(SIG_SETMASK, &old, NULL); + } +} + +/* + * 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 && 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) || + (bank == AB8500_SYS_CTRL2_BLOCK)); +} + +int ab8500_sysctrl_read(u16 reg, u8 *value) +{ + u8 bank; + + if (sysctrl_dev == NULL) + return -EINVAL; + + bank = (reg >> 8); + if (!valid_bank(bank)) + return -EINVAL; + + return abx500_get_register_interruptible(sysctrl_dev, bank, + (u8)(reg & 0xFF), value); +} +EXPORT_SYMBOL(ab8500_sysctrl_read); + +int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value) +{ + u8 bank; + + if (sysctrl_dev == NULL) + return -EINVAL; + + bank = (reg >> 8); + if (!valid_bank(bank)) + return -EINVAL; + + return abx500_mask_and_set_register_interruptible(sysctrl_dev, bank, + (u8)(reg & 0xFF), mask, value); +} +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; + + plat = dev_get_platdata(pdev->dev.parent); + + if (!plat) + return -EINVAL; + + sysctrl_dev = &pdev->dev; + + if (!pm_power_off) + pm_power_off = ab8500_power_off; + + pdata = plat->sysctrl; + if (pdata) { + int last, ret, i, j; + + if (is_ab8505(ab8500)) + last = AB8500_SYSCLKREQ4RFCLKBUF; + else + last = AB8500_SYSCLKREQ8RFCLKBUF; + + for (i = AB8500_SYSCLKREQ1RFCLKBUF; i <= last; i++) { + j = i - AB8500_SYSCLKREQ1RFCLKBUF; + ret = ab8500_sysctrl_write(i, 0xff, + pdata->initial_req_buf_config[j]); + dev_dbg(&pdev->dev, + "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: " + "%d\n", j + 1, ret); + } + } + } + + return 0; +} + +static int ab8500_sysctrl_remove(struct platform_device *pdev) +{ + sysctrl_dev = NULL; + + if (pm_power_off == ab8500_power_off) + pm_power_off = NULL; + + return 0; +} + +static struct platform_driver ab8500_sysctrl_driver = { + .driver = { + .name = "ab8500-sysctrl", + .owner = THIS_MODULE, + }, + .probe = ab8500_sysctrl_probe, + .remove = ab8500_sysctrl_remove, +}; + +static int __init ab8500_sysctrl_init(void) +{ + return platform_driver_register(&ab8500_sysctrl_driver); +} +arch_initcall(ab8500_sysctrl_init); + +MODULE_AUTHOR("Mattias Nilsson <mattias.i.nilsson@stericsson.com"); +MODULE_DESCRIPTION("AB8500 system control driver"); +MODULE_LICENSE("GPL v2"); |