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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * AB8500 system control driver
4 *
5 * Copyright (C) ST-Ericsson SA 2010
6 * Author: Mattias Nilsson <mattias.i.nilsson@stericsson.com> for ST Ericsson.
7 */
8
9#include <linux/err.h>
10#include <linux/init.h>
11#include <linux/export.h>
12#include <linux/platform_device.h>
13#include <linux/pm.h>
14#include <linux/reboot.h>
15#include <linux/signal.h>
16#include <linux/power_supply.h>
17#include <linux/mfd/abx500.h>
18#include <linux/mfd/abx500/ab8500.h>
19#include <linux/mfd/abx500/ab8500-sysctrl.h>
20
21/* RtcCtrl bits */
22#define AB8500_ALARM_MIN_LOW 0x08
23#define AB8500_ALARM_MIN_MID 0x09
24#define RTC_CTRL 0x0B
25#define RTC_ALARM_ENABLE 0x4
26
27static struct device *sysctrl_dev;
28
29static void ab8500_power_off(void)
30{
31 sigset_t old;
32 sigset_t all;
33 static const char * const pss[] = {"ab8500_ac", "pm2301", "ab8500_usb"};
34 int i;
35 bool charger_present = false;
36 union power_supply_propval val;
37 struct power_supply *psy;
38 int ret;
39
40 if (sysctrl_dev == NULL) {
41 pr_err("%s: sysctrl not initialized\n", __func__);
42 return;
43 }
44
45 /*
46 * If we have a charger connected and we're powering off,
47 * reboot into charge-only mode.
48 */
49
50 for (i = 0; i < ARRAY_SIZE(pss); i++) {
51 psy = power_supply_get_by_name(pss[i]);
52 if (!psy)
53 continue;
54
55 ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_ONLINE,
56 &val);
57 power_supply_put(psy);
58
59 if (!ret && val.intval) {
60 charger_present = true;
61 break;
62 }
63 }
64
65 if (!charger_present)
66 goto shutdown;
67
68 /* Check if battery is known */
69 psy = power_supply_get_by_name("ab8500_btemp");
70 if (psy) {
71 ret = power_supply_get_property(psy,
72 POWER_SUPPLY_PROP_TECHNOLOGY, &val);
73 if (!ret && val.intval != POWER_SUPPLY_TECHNOLOGY_UNKNOWN) {
74 pr_info("Charger '%s' is connected with known battery",
75 pss[i]);
76 pr_info(" - Rebooting.\n");
77 machine_restart("charging");
78 }
79 power_supply_put(psy);
80 }
81
82shutdown:
83 sigfillset(&all);
84
85 if (!sigprocmask(SIG_BLOCK, &all, &old)) {
86 (void)ab8500_sysctrl_set(AB8500_STW4500CTRL1,
87 AB8500_STW4500CTRL1_SWOFF |
88 AB8500_STW4500CTRL1_SWRESET4500N);
89 (void)sigprocmask(SIG_SETMASK, &old, NULL);
90 }
91}
92
93static inline bool valid_bank(u8 bank)
94{
95 return ((bank == AB8500_SYS_CTRL1_BLOCK) ||
96 (bank == AB8500_SYS_CTRL2_BLOCK));
97}
98
99int ab8500_sysctrl_read(u16 reg, u8 *value)
100{
101 u8 bank;
102
103 if (sysctrl_dev == NULL)
104 return -EPROBE_DEFER;
105
106 bank = (reg >> 8);
107 if (!valid_bank(bank))
108 return -EINVAL;
109
110 return abx500_get_register_interruptible(sysctrl_dev, bank,
111 (u8)(reg & 0xFF), value);
112}
113EXPORT_SYMBOL(ab8500_sysctrl_read);
114
115int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value)
116{
117 u8 bank;
118
119 if (sysctrl_dev == NULL)
120 return -EPROBE_DEFER;
121
122 bank = (reg >> 8);
123 if (!valid_bank(bank)) {
124 pr_err("invalid bank\n");
125 return -EINVAL;
126 }
127
128 return abx500_mask_and_set_register_interruptible(sysctrl_dev, bank,
129 (u8)(reg & 0xFF), mask, value);
130}
131EXPORT_SYMBOL(ab8500_sysctrl_write);
132
133static int ab8500_sysctrl_probe(struct platform_device *pdev)
134{
135 sysctrl_dev = &pdev->dev;
136
137 if (!pm_power_off)
138 pm_power_off = ab8500_power_off;
139
140 return 0;
141}
142
143static int ab8500_sysctrl_remove(struct platform_device *pdev)
144{
145 sysctrl_dev = NULL;
146
147 if (pm_power_off == ab8500_power_off)
148 pm_power_off = NULL;
149
150 return 0;
151}
152
153static const struct of_device_id ab8500_sysctrl_match[] = {
154 { .compatible = "stericsson,ab8500-sysctrl", },
155 {}
156};
157
158static struct platform_driver ab8500_sysctrl_driver = {
159 .driver = {
160 .name = "ab8500-sysctrl",
161 .of_match_table = ab8500_sysctrl_match,
162 },
163 .probe = ab8500_sysctrl_probe,
164 .remove = ab8500_sysctrl_remove,
165};
166
167static int __init ab8500_sysctrl_init(void)
168{
169 return platform_driver_register(&ab8500_sysctrl_driver);
170}
171arch_initcall(ab8500_sysctrl_init);
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>
8#include <linux/module.h>
9#include <linux/platform_device.h>
10#include <linux/pm.h>
11#include <linux/reboot.h>
12#include <linux/signal.h>
13#include <linux/power_supply.h>
14#include <linux/mfd/abx500.h>
15#include <linux/mfd/abx500/ab8500.h>
16#include <linux/mfd/abx500/ab8500-sysctrl.h>
17
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
24static struct device *sysctrl_dev;
25
26static void ab8500_power_off(void)
27{
28 sigset_t old;
29 sigset_t all;
30 static char *pss[] = {"ab8500_ac", "pm2301", "ab8500_usb"};
31 int i;
32 bool charger_present = false;
33 union power_supply_propval val;
34 struct power_supply *psy;
35 int ret;
36
37 if (sysctrl_dev == NULL) {
38 pr_err("%s: sysctrl not initialized\n", __func__);
39 return;
40 }
41
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++) {
48 psy = power_supply_get_by_name(pss[i]);
49 if (!psy)
50 continue;
51
52 ret = psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &val);
53
54 if (!ret && val.intval) {
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) {
69 printk(KERN_INFO
70 "Charger \"%s\" is connected with known battery."
71 " Rebooting.\n",
72 pss[i]);
73 machine_restart("charging");
74 }
75 }
76
77shutdown:
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
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 */
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 && 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
145static 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)
156 return -EINVAL;
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}
165EXPORT_SYMBOL(ab8500_sysctrl_read);
166
167int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value)
168{
169 u8 bank;
170
171 if (sysctrl_dev == NULL)
172 return -EINVAL;
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}
181EXPORT_SYMBOL(ab8500_sysctrl_write);
182
183static int ab8500_sysctrl_probe(struct platform_device *pdev)
184{
185 struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent);
186 struct ab8500_platform_data *plat;
187 struct ab8500_sysctrl_platform_data *pdata;
188
189 plat = dev_get_platdata(pdev->dev.parent);
190
191 if (!plat)
192 return -EINVAL;
193
194 sysctrl_dev = &pdev->dev;
195
196 if (!pm_power_off)
197 pm_power_off = ab8500_power_off;
198
199 pdata = plat->sysctrl;
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 }
221 }
222 }
223
224 return 0;
225}
226
227static int ab8500_sysctrl_remove(struct platform_device *pdev)
228{
229 sysctrl_dev = NULL;
230
231 if (pm_power_off == ab8500_power_off)
232 pm_power_off = NULL;
233
234 return 0;
235}
236
237static struct platform_driver ab8500_sysctrl_driver = {
238 .driver = {
239 .name = "ab8500-sysctrl",
240 .owner = THIS_MODULE,
241 },
242 .probe = ab8500_sysctrl_probe,
243 .remove = ab8500_sysctrl_remove,
244};
245
246static int __init ab8500_sysctrl_init(void)
247{
248 return platform_driver_register(&ab8500_sysctrl_driver);
249}
250arch_initcall(ab8500_sysctrl_init);
251
252MODULE_AUTHOR("Mattias Nilsson <mattias.i.nilsson@stericsson.com");
253MODULE_DESCRIPTION("AB8500 system control driver");
254MODULE_LICENSE("GPL v2");