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Mattias Nilsson90550d12011-02-14 11:17:12 +01001/*
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>
Paul Gortmaker4e36dd32011-07-03 15:13:27 -04008#include <linux/module.h>
Mattias Nilsson90550d12011-02-14 11:17:12 +01009#include <linux/platform_device.h>
Lee Jones379749c2013-01-14 13:26:15 +000010#include <linux/pm.h>
Jonas Aaberg7c34d7c2011-08-17 13:20:21 +020011#include <linux/reboot.h>
Lee Jones379749c2013-01-14 13:26:15 +000012#include <linux/signal.h>
Jonas Aaberg7c34d7c2011-08-17 13:20:21 +020013#include <linux/power_supply.h>
Mattias Nilsson90550d12011-02-14 11:17:12 +010014#include <linux/mfd/abx500.h>
Linus Walleijee66e652011-12-02 14:16:33 +010015#include <linux/mfd/abx500/ab8500.h>
16#include <linux/mfd/abx500/ab8500-sysctrl.h>
Mattias Nilsson90550d12011-02-14 11:17:12 +010017
Lee Jones75932092013-02-12 15:11:19 +000018/* 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
Mattias Nilsson90550d12011-02-14 11:17:12 +010024static struct device *sysctrl_dev;
25
Lee Jones379749c2013-01-14 13:26:15 +000026void ab8500_power_off(void)
27{
28 sigset_t old;
29 sigset_t all;
Rajkumar Kasirajanf04a9d82012-05-30 16:32:37 +053030 static char *pss[] = {"ab8500_ac", "pm2301", "ab8500_usb"};
Jonas Aaberg7c34d7c2011-08-17 13:20:21 +020031 int i;
Jonas Aaberg09039402011-08-17 15:58:52 +020032 bool charger_present = false;
33 union power_supply_propval val;
34 struct power_supply *psy;
35 int ret;
Jonas Aaberg7c34d7c2011-08-17 13:20:21 +020036
Marcus Danielsson2377e522012-06-18 15:00:40 +020037 if (sysctrl_dev == NULL) {
38 pr_err("%s: sysctrl not initialized\n", __func__);
39 return;
40 }
41
Jonas Aaberg7c34d7c2011-08-17 13:20:21 +020042 /*
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++) {
Jonas Aaberg7c34d7c2011-08-17 13:20:21 +020048 psy = power_supply_get_by_name(pss[i]);
49 if (!psy)
50 continue;
Jonas Aaberg09039402011-08-17 15:58:52 +020051
Jonas Aaberg7c34d7c2011-08-17 13:20:21 +020052 ret = psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &val);
53
54 if (!ret && val.intval) {
Jonas Aaberg09039402011-08-17 15:58:52 +020055 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) {
Jonas Aaberg7c34d7c2011-08-17 13:20:21 +020069 printk(KERN_INFO
Jonas Aaberg09039402011-08-17 15:58:52 +020070 "Charger \"%s\" is connected with known battery."
71 " Rebooting.\n",
Jonas Aaberg7c34d7c2011-08-17 13:20:21 +020072 pss[i]);
Jonas Aaberg5a4bac62011-08-18 10:14:38 +020073 machine_restart("charging");
Jonas Aaberg7c34d7c2011-08-17 13:20:21 +020074 }
75 }
Lee Jones379749c2013-01-14 13:26:15 +000076
Jonas Aaberg09039402011-08-17 15:58:52 +020077shutdown:
Lee Jones379749c2013-01-14 13:26:15 +000078 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
Lee Jones75932092013-02-12 15:11:19 +000088/*
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 */
93void 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;
107 if (pdata->reboot_reason_code)
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
Mattias Nilsson90550d12011-02-14 11:17:12 +0100145static inline bool valid_bank(u8 bank)
146{
147 return ((bank == AB8500_SYS_CTRL1_BLOCK) ||
148 (bank == AB8500_SYS_CTRL2_BLOCK));
149}
150
151int ab8500_sysctrl_read(u16 reg, u8 *value)
152{
153 u8 bank;
154
155 if (sysctrl_dev == NULL)
Marcus Danielsson2377e522012-06-18 15:00:40 +0200156 return -EINVAL;
Mattias Nilsson90550d12011-02-14 11:17:12 +0100157
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}
Jonas Aabergc73db9f2011-11-11 07:52:10 +0100165EXPORT_SYMBOL(ab8500_sysctrl_read);
Mattias Nilsson90550d12011-02-14 11:17:12 +0100166
167int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value)
168{
169 u8 bank;
170
171 if (sysctrl_dev == NULL)
Marcus Danielsson2377e522012-06-18 15:00:40 +0200172 return -EINVAL;
Mattias Nilsson90550d12011-02-14 11:17:12 +0100173
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}
Jonas Aabergc73db9f2011-11-11 07:52:10 +0100181EXPORT_SYMBOL(ab8500_sysctrl_write);
Mattias Nilsson90550d12011-02-14 11:17:12 +0100182
Bill Pembertonf791be42012-11-19 13:23:04 -0500183static int ab8500_sysctrl_probe(struct platform_device *pdev)
Mattias Nilsson90550d12011-02-14 11:17:12 +0100184{
Rabin Vincentc5535522012-08-22 13:08:11 +0200185 struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent);
Lee Jones379749c2013-01-14 13:26:15 +0000186 struct ab8500_platform_data *plat;
Kennet Wallden1abf0632011-09-27 09:23:56 +0200187 struct ab8500_sysctrl_platform_data *pdata;
Lee Jones379749c2013-01-14 13:26:15 +0000188
Lee Jones379749c2013-01-14 13:26:15 +0000189 plat = dev_get_platdata(pdev->dev.parent);
Marcus Danielsson2377e522012-06-18 15:00:40 +0200190
191 if (!(plat && plat->sysctrl))
192 return -EINVAL;
193
Lee Jones379749c2013-01-14 13:26:15 +0000194 if (plat->pm_power_off)
195 pm_power_off = ab8500_power_off;
Kennet Wallden1abf0632011-09-27 09:23:56 +0200196
197 pdata = plat->sysctrl;
198
Rabin Vincentc5535522012-08-22 13:08:11 +0200199 if (pdata) {
200 int last, ret, i, j;
Kennet Wallden1abf0632011-09-27 09:23:56 +0200201
Rabin Vincentc5535522012-08-22 13:08:11 +0200202 if (is_ab8505(ab8500))
203 last = AB8500_SYSCLKREQ4RFCLKBUF;
204 else
205 last = AB8500_SYSCLKREQ8RFCLKBUF;
206
207 for (i = AB8500_SYSCLKREQ1RFCLKBUF; i <= last; i++) {
208 j = i - AB8500_SYSCLKREQ1RFCLKBUF;
209 ret = ab8500_sysctrl_write(i, 0xff,
210 pdata->initial_req_buf_config[j]);
211 dev_dbg(&pdev->dev,
212 "Setting SysClkReq%dRfClkBuf 0x%X\n",
213 j + 1,
214 pdata->initial_req_buf_config[j]);
215 if (ret < 0) {
216 dev_err(&pdev->dev,
217 "unable to set sysClkReq%dRfClkBuf: "
218 "%d\n", j + 1, ret);
219 }
Kennet Wallden1abf0632011-09-27 09:23:56 +0200220 }
221 }
222
Mattias Nilsson90550d12011-02-14 11:17:12 +0100223 return 0;
224}
225
Bill Pemberton4740f732012-11-19 13:26:01 -0500226static int ab8500_sysctrl_remove(struct platform_device *pdev)
Mattias Nilsson90550d12011-02-14 11:17:12 +0100227{
228 sysctrl_dev = NULL;
229 return 0;
230}
231
232static struct platform_driver ab8500_sysctrl_driver = {
233 .driver = {
234 .name = "ab8500-sysctrl",
235 .owner = THIS_MODULE,
Mattias Nilsson90550d12011-02-14 11:17:12 +0100236 },
237 .probe = ab8500_sysctrl_probe,
Bill Pemberton84449212012-11-19 13:20:24 -0500238 .remove = ab8500_sysctrl_remove,
Mattias Nilsson90550d12011-02-14 11:17:12 +0100239};
240
241static int __init ab8500_sysctrl_init(void)
242{
243 return platform_driver_register(&ab8500_sysctrl_driver);
244}
Ulf Hanssoncaa62d62013-04-03 01:06:27 +0200245arch_initcall(ab8500_sysctrl_init);
Mattias Nilsson90550d12011-02-14 11:17:12 +0100246
247MODULE_AUTHOR("Mattias Nilsson <mattias.i.nilsson@stericsson.com");
248MODULE_DESCRIPTION("AB8500 system control driver");
249MODULE_LICENSE("GPL v2");