Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17

Linux/drivers/mfd/ab8500-sysctrl.c

  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 
 24 static struct device *sysctrl_dev;
 25 
 26 static 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 
 77 shutdown:
 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  */
 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;
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 
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)
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 }
165 EXPORT_SYMBOL(ab8500_sysctrl_read);
166 
167 int 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 }
181 EXPORT_SYMBOL(ab8500_sysctrl_write);
182 
183 static 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 
227 static 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 
237 static 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 
246 static int __init ab8500_sysctrl_init(void)
247 {
248         return platform_driver_register(&ab8500_sysctrl_driver);
249 }
250 arch_initcall(ab8500_sysctrl_init);
251 
252 MODULE_AUTHOR("Mattias Nilsson <mattias.i.nilsson@stericsson.com");
253 MODULE_DESCRIPTION("AB8500 system control driver");
254 MODULE_LICENSE("GPL v2");
255 

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