/* * 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");