[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / mfd / ab8500-sysctrl.c

/*
 * 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");
Commit	Line	Data
90550d19 MN	1	/*
	2	* Copyright (C) ST-Ericsson SA 2010
	3	* Author: Mattias Nilsson <mattias.i.nilsson@stericsson.com> for ST Ericsson.
	4	* License terms: GNU General Public License (GPL) version 2
	5	*/
	6
	7	#include <linux/err.h>
4e36dd33	8	#include <linux/module.h>
90550d19	9	#include <linux/platform_device.h>
379749c4	10	#include <linux/pm.h>
7c34d7c2	11	#include <linux/reboot.h>
379749c4	12	#include <linux/signal.h>
7c34d7c2	13	#include <linux/power_supply.h>
90550d19	14	#include <linux/mfd/abx500.h>
ee66e653 LW	15	#include <linux/mfd/abx500/ab8500.h>
ee66e653 LW	16	#include <linux/mfd/abx500/ab8500-sysctrl.h>
90550d19	17
75932094 LJ	18	/* RtcCtrl bits */
	19	#define AB8500_ALARM_MIN_LOW 0x08
	20	#define AB8500_ALARM_MIN_MID 0x09
	21	#define RTC_CTRL 0x0B
	22	#define RTC_ALARM_ENABLE 0x4
	23
90550d19 MN	24	static struct device *sysctrl_dev;
90550d19 MN	25
3d2088a1	26	static void ab8500_power_off(void)
379749c4 LJ	27	{
	28	sigset_t old;
	29	sigset_t all;
f04a9d8a	30	static char *pss[] = {"ab8500_ac", "pm2301", "ab8500_usb"};
7c34d7c2	31	int i;
0903940d JA	32	bool charger_present = false;
	33	union power_supply_propval val;
	34	struct power_supply *psy;
	35	int ret;
7c34d7c2	36
2377e52f MD	37	if (sysctrl_dev == NULL) {
	38	pr_err("%s: sysctrl not initialized\n", __func__);
	39	return;
	40	}
	41
7c34d7c2 JA	42	/*
	43	* If we have a charger connected and we're powering off,
	44	* reboot into charge-only mode.
	45	*/
	46
	47	for (i = 0; i < ARRAY_SIZE(pss); i++) {
7c34d7c2 JA	48	psy = power_supply_get_by_name(pss[i]);
	49	if (!psy)
	50	continue;
0903940d	51
7c34d7c2 JA	52	ret = psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &val);
	53
	54	if (!ret && val.intval) {
0903940d JA	55	charger_present = true;
	56	break;
	57	}
	58	}
	59
	60	if (!charger_present)
	61	goto shutdown;
	62
	63	/* Check if battery is known */
	64	psy = power_supply_get_by_name("ab8500_btemp");
	65	if (psy) {
	66	ret = psy->get_property(psy, POWER_SUPPLY_PROP_TECHNOLOGY,
	67	&val);
	68	if (!ret && val.intval != POWER_SUPPLY_TECHNOLOGY_UNKNOWN) {
7c34d7c2	69	printk(KERN_INFO
0903940d JA	70	"Charger \"%s\" is connected with known battery."
0903940d JA	71	" Rebooting.\n",
7c34d7c2	72	pss[i]);
5a4bac6e	73	machine_restart("charging");
7c34d7c2 JA	74	}
7c34d7c2 JA	75	}
379749c4	76
0903940d	77	shutdown:
379749c4 LJ	78	sigfillset(&all);
	79
	80	if (!sigprocmask(SIG_BLOCK, &all, &old)) {
	81	(void)ab8500_sysctrl_set(AB8500_STW4500CTRL1,
	82	AB8500_STW4500CTRL1_SWOFF \|
	83	AB8500_STW4500CTRL1_SWRESET4500N);
	84	(void)sigprocmask(SIG_SETMASK, &old, NULL);
	85	}
	86	}
	87
75932094 LJ	88	/*
	89	* Use the AB WD to reset the platform. It will perform a hard
	90	* reset instead of a soft reset. Write the reset reason to
	91	* the AB before reset, which can be read upon restart.
	92	*/
	93	void ab8500_restart(char mode, const char *cmd)
	94	{
	95	struct ab8500_platform_data *plat;
	96	struct ab8500_sysctrl_platform_data *pdata;
	97	u16 reason = 0;
	98	u8 val;
	99
	100	if (sysctrl_dev == NULL) {
	101	pr_err("%s: sysctrl not initialized\n", __func__);
	102	return;
	103	}
	104
	105	plat = dev_get_platdata(sysctrl_dev->parent);
	106	pdata = plat->sysctrl;
5649d8f9	107	if (pdata && pdata->reboot_reason_code)
75932094 LJ	108	reason = pdata->reboot_reason_code(cmd);
	109	else
	110	pr_warn("[%s] No reboot reason set. Default reason %d\n",
	111	__func__, reason);
	112
	113	/*
	114	* Disable RTC alarm, just a precaution so that no alarm
	115	* is running when WD reset is executed.
	116	*/
	117	abx500_get_register_interruptible(sysctrl_dev, AB8500_RTC,
	118	RTC_CTRL , &val);
	119	abx500_set_register_interruptible(sysctrl_dev, AB8500_RTC,
	120	RTC_CTRL , (val & ~RTC_ALARM_ENABLE));
	121
	122	/*
	123	* Android is not using the RTC alarm registers during reboot
	124	* so we borrow them for writing the reason of reset
	125	*/
	126
	127	/* reason[8 LSB] */
	128	val = reason & 0xFF;
	129	abx500_set_register_interruptible(sysctrl_dev, AB8500_RTC,
	130	AB8500_ALARM_MIN_LOW , val);
	131
	132	/* reason[8 MSB] */
	133	val = (reason>>8) & 0xFF;
	134	abx500_set_register_interruptible(sysctrl_dev, AB8500_RTC,
	135	AB8500_ALARM_MIN_MID , val);
	136
	137	/* Setting WD timeout to 0 */
	138	ab8500_sysctrl_write(AB8500_MAINWDOGTIMER, 0xFF, 0x0);
	139
	140	/* Setting the parameters to AB8500 WD*/
	141	ab8500_sysctrl_write(AB8500_MAINWDOGCTRL, 0xFF, (AB8500_ENABLE_WD \|
	142	AB8500_WD_RESTART_ON_EXPIRE \| AB8500_KICK_WD));
	143	}
	144
90550d19 MN	145	static inline bool valid_bank(u8 bank)
	146	{
	147	return ((bank == AB8500_SYS_CTRL1_BLOCK) \|\|
	148	(bank == AB8500_SYS_CTRL2_BLOCK));
	149	}
	150
	151	int ab8500_sysctrl_read(u16 reg, u8 *value)
	152	{
	153	u8 bank;
	154
	155	if (sysctrl_dev == NULL)
2377e52f	156	return -EINVAL;
90550d19 MN	157
	158	bank = (reg >> 8);
	159	if (!valid_bank(bank))
	160	return -EINVAL;
	161
	162	return abx500_get_register_interruptible(sysctrl_dev, bank,
	163	(u8)(reg & 0xFF), value);
	164	}
c73db9f7	165	EXPORT_SYMBOL(ab8500_sysctrl_read);
90550d19 MN	166
	167	int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value)
	168	{
	169	u8 bank;
	170
	171	if (sysctrl_dev == NULL)
2377e52f	172	return -EINVAL;
90550d19 MN	173
	174	bank = (reg >> 8);
	175	if (!valid_bank(bank))
	176	return -EINVAL;
	177
	178	return abx500_mask_and_set_register_interruptible(sysctrl_dev, bank,
	179	(u8)(reg & 0xFF), mask, value);
	180	}
c73db9f7	181	EXPORT_SYMBOL(ab8500_sysctrl_write);
90550d19	182
f791be49	183	static int ab8500_sysctrl_probe(struct platform_device *pdev)
90550d19	184	{
c5535522	185	struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent);
379749c4	186	struct ab8500_platform_data *plat;
1abf063f	187	struct ab8500_sysctrl_platform_data *pdata;
379749c4	188
379749c4	189	plat = dev_get_platdata(pdev->dev.parent);
2377e52f	190
5649d8f9	191	if (!plat)
2377e52f MD	192	return -EINVAL;
2377e52f MD	193
9f7af61a FB	194	sysctrl_dev = &pdev->dev;
9f7af61a FB	195
0b8ebdb1	196	if (!pm_power_off)
379749c4	197	pm_power_off = ab8500_power_off;
1abf063f KW	198
1abf063f KW	199	pdata = plat->sysctrl;
c5535522 RV	200	if (pdata) {
	201	int last, ret, i, j;
	202
	203	if (is_ab8505(ab8500))
	204	last = AB8500_SYSCLKREQ4RFCLKBUF;
	205	else
	206	last = AB8500_SYSCLKREQ8RFCLKBUF;
	207
	208	for (i = AB8500_SYSCLKREQ1RFCLKBUF; i <= last; i++) {
	209	j = i - AB8500_SYSCLKREQ1RFCLKBUF;
	210	ret = ab8500_sysctrl_write(i, 0xff,
	211	pdata->initial_req_buf_config[j]);
	212	dev_dbg(&pdev->dev,
	213	"Setting SysClkReq%dRfClkBuf 0x%X\n",
	214	j + 1,
	215	pdata->initial_req_buf_config[j]);
	216	if (ret < 0) {
	217	dev_err(&pdev->dev,
	218	"unable to set sysClkReq%dRfClkBuf: "
	219	"%d\n", j + 1, ret);
	220	}
1abf063f KW	221	}
	222	}
	223
90550d19 MN	224	return 0;
	225	}
	226
4740f73f	227	static int ab8500_sysctrl_remove(struct platform_device *pdev)
90550d19 MN	228	{
90550d19 MN	229	sysctrl_dev = NULL;
0b8ebdb1 FB	230
	231	if (pm_power_off == ab8500_power_off)
	232	pm_power_off = NULL;
	233
90550d19 MN	234	return 0;
	235	}
	236
	237	static struct platform_driver ab8500_sysctrl_driver = {
	238	.driver = {
	239	.name = "ab8500-sysctrl",
	240	.owner = THIS_MODULE,
	241	},
	242	.probe = ab8500_sysctrl_probe,
84449216	243	.remove = ab8500_sysctrl_remove,
90550d19 MN	244	};
	245
	246	static int __init ab8500_sysctrl_init(void)
	247	{
	248	return platform_driver_register(&ab8500_sysctrl_driver);
	249	}
caa62d64	250	arch_initcall(ab8500_sysctrl_init);
90550d19 MN	251
	252	MODULE_AUTHOR("Mattias Nilsson <mattias.i.nilsson@stericsson.com");
	253	MODULE_DESCRIPTION("AB8500 system control driver");
	254	MODULE_LICENSE("GPL v2");