summaryrefslogtreecommitdiffstats
path: root/drivers/mfd/ab8500-sysctrl.c
blob: fbca1ced49faac60bfffdef6ff6e19474475ff7b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
/*
 * 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;

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->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 && plat->sysctrl))
		return -EINVAL;

	if (plat->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;
	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");