MIPS: Alchemy: devboards: Convert to gpio calls.
[linux-2.6.git] / arch / mips / alchemy / devboards / pm.c
1 /*
2  * Alchemy Development Board example suspend userspace interface.
3  *
4  * (c) 2008 Manuel Lauss <mano@roarinelk.homelinux.net>
5  */
6
7 #include <linux/init.h>
8 #include <linux/kobject.h>
9 #include <linux/suspend.h>
10 #include <linux/sysfs.h>
11 #include <asm/mach-au1x00/au1000.h>
12 #include <asm/mach-au1x00/gpio.h>
13
14 /*
15  * Generic suspend userspace interface for Alchemy development boards.
16  * This code exports a few sysfs nodes under /sys/power/db1x/ which
17  * can be used by userspace to en/disable all au1x-provided wakeup
18  * sources and configure the timeout after which the the TOYMATCH2 irq
19  * is to trigger a wakeup.
20  */
21
22
23 static unsigned long db1x_pm_sleep_secs;
24 static unsigned long db1x_pm_wakemsk;
25 static unsigned long db1x_pm_last_wakesrc;
26
27 static int db1x_pm_enter(suspend_state_t state)
28 {
29         /* enable GPIO based wakeup */
30         alchemy_gpio1_input_enable();
31
32         /* clear and setup wake cause and source */
33         au_writel(0, SYS_WAKEMSK);
34         au_sync();
35         au_writel(0, SYS_WAKESRC);
36         au_sync();
37
38         au_writel(db1x_pm_wakemsk, SYS_WAKEMSK);
39         au_sync();
40
41         /* setup 1Hz-timer-based wakeup: wait for reg access */
42         while (au_readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_M20)
43                 asm volatile ("nop");
44
45         au_writel(au_readl(SYS_TOYREAD) + db1x_pm_sleep_secs, SYS_TOYMATCH2);
46         au_sync();
47
48         /* wait for value to really hit the register */
49         while (au_readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_M20)
50                 asm volatile ("nop");
51
52         /* ...and now the sandman can come! */
53         au_sleep();
54
55         return 0;
56 }
57
58 static int db1x_pm_begin(suspend_state_t state)
59 {
60         if (!db1x_pm_wakemsk) {
61                 printk(KERN_ERR "db1x: no wakeup source activated!\n");
62                 return -EINVAL;
63         }
64
65         return 0;
66 }
67
68 static void db1x_pm_end(void)
69 {
70         /* read and store wakeup source, the clear the register. To
71          * be able to clear it, WAKEMSK must be cleared first.
72          */
73         db1x_pm_last_wakesrc = au_readl(SYS_WAKESRC);
74
75         au_writel(0, SYS_WAKEMSK);
76         au_writel(0, SYS_WAKESRC);
77         au_sync();
78
79 }
80
81 static struct platform_suspend_ops db1x_pm_ops = {
82         .valid          = suspend_valid_only_mem,
83         .begin          = db1x_pm_begin,
84         .enter          = db1x_pm_enter,
85         .end            = db1x_pm_end,
86 };
87
88 #define ATTRCMP(x) (0 == strcmp(attr->attr.name, #x))
89
90 static ssize_t db1x_pmattr_show(struct kobject *kobj,
91                                 struct kobj_attribute *attr,
92                                 char *buf)
93 {
94         int idx;
95
96         if (ATTRCMP(timer_timeout))
97                 return sprintf(buf, "%lu\n", db1x_pm_sleep_secs);
98
99         else if (ATTRCMP(timer))
100                 return sprintf(buf, "%u\n",
101                                 !!(db1x_pm_wakemsk & SYS_WAKEMSK_M2));
102
103         else if (ATTRCMP(wakesrc))
104                 return sprintf(buf, "%lu\n", db1x_pm_last_wakesrc);
105
106         else if (ATTRCMP(gpio0) || ATTRCMP(gpio1) || ATTRCMP(gpio2) ||
107                  ATTRCMP(gpio3) || ATTRCMP(gpio4) || ATTRCMP(gpio5) ||
108                  ATTRCMP(gpio6) || ATTRCMP(gpio7)) {
109                 idx = (attr->attr.name)[4] - '0';
110                 return sprintf(buf, "%d\n",
111                         !!(db1x_pm_wakemsk & SYS_WAKEMSK_GPIO(idx)));
112
113         } else if (ATTRCMP(wakemsk)) {
114                 return sprintf(buf, "%08lx\n", db1x_pm_wakemsk);
115         }
116
117         return -ENOENT;
118 }
119
120 static ssize_t db1x_pmattr_store(struct kobject *kobj,
121                                  struct kobj_attribute *attr,
122                                  const char *instr,
123                                  size_t bytes)
124 {
125         unsigned long l;
126         int tmp;
127
128         if (ATTRCMP(timer_timeout)) {
129                 tmp = strict_strtoul(instr, 0, &l);
130                 if (tmp)
131                         return tmp;
132
133                 db1x_pm_sleep_secs = l;
134
135         } else if (ATTRCMP(timer)) {
136                 if (instr[0] != '0')
137                         db1x_pm_wakemsk |= SYS_WAKEMSK_M2;
138                 else
139                         db1x_pm_wakemsk &= ~SYS_WAKEMSK_M2;
140
141         } else if (ATTRCMP(gpio0) || ATTRCMP(gpio1) || ATTRCMP(gpio2) ||
142                    ATTRCMP(gpio3) || ATTRCMP(gpio4) || ATTRCMP(gpio5) ||
143                    ATTRCMP(gpio6) || ATTRCMP(gpio7)) {
144                 tmp = (attr->attr.name)[4] - '0';
145                 if (instr[0] != '0') {
146                         db1x_pm_wakemsk |= SYS_WAKEMSK_GPIO(tmp);
147                 } else {
148                         db1x_pm_wakemsk &= ~SYS_WAKEMSK_GPIO(tmp);
149                 }
150
151         } else if (ATTRCMP(wakemsk)) {
152                 tmp = strict_strtoul(instr, 0, &l);
153                 if (tmp)
154                         return tmp;
155
156                 db1x_pm_wakemsk = l & 0x0000003f;
157
158         } else
159                 bytes = -ENOENT;
160
161         return bytes;
162 }
163
164 #define ATTR(x)                                                 \
165         static struct kobj_attribute x##_attribute =            \
166                 __ATTR(x, 0664, db1x_pmattr_show,               \
167                                 db1x_pmattr_store);
168
169 ATTR(gpio0)             /* GPIO-based wakeup enable */
170 ATTR(gpio1)
171 ATTR(gpio2)
172 ATTR(gpio3)
173 ATTR(gpio4)
174 ATTR(gpio5)
175 ATTR(gpio6)
176 ATTR(gpio7)
177 ATTR(timer)             /* TOYMATCH2-based wakeup enable */
178 ATTR(timer_timeout)     /* timer-based wakeup timeout value, in seconds */
179 ATTR(wakesrc)           /* contents of SYS_WAKESRC after last wakeup */
180 ATTR(wakemsk)           /* direct access to SYS_WAKEMSK */
181
182 #define ATTR_LIST(x)    & x ## _attribute.attr
183 static struct attribute *db1x_pmattrs[] = {
184         ATTR_LIST(gpio0),
185         ATTR_LIST(gpio1),
186         ATTR_LIST(gpio2),
187         ATTR_LIST(gpio3),
188         ATTR_LIST(gpio4),
189         ATTR_LIST(gpio5),
190         ATTR_LIST(gpio6),
191         ATTR_LIST(gpio7),
192         ATTR_LIST(timer),
193         ATTR_LIST(timer_timeout),
194         ATTR_LIST(wakesrc),
195         ATTR_LIST(wakemsk),
196         NULL,           /* terminator */
197 };
198
199 static struct attribute_group db1x_pmattr_group = {
200         .name   = "db1x",
201         .attrs  = db1x_pmattrs,
202 };
203
204 /*
205  * Initialize suspend interface
206  */
207 static int __init pm_init(void)
208 {
209         /* init TOY to tick at 1Hz if not already done. No need to wait
210          * for confirmation since there's plenty of time from here to
211          * the next suspend cycle.
212          */
213         if (au_readl(SYS_TOYTRIM) != 32767) {
214                 au_writel(32767, SYS_TOYTRIM);
215                 au_sync();
216         }
217
218         db1x_pm_last_wakesrc = au_readl(SYS_WAKESRC);
219
220         au_writel(0, SYS_WAKESRC);
221         au_sync();
222         au_writel(0, SYS_WAKEMSK);
223         au_sync();
224
225         suspend_set_ops(&db1x_pm_ops);
226
227         return sysfs_create_group(power_kobj, &db1x_pmattr_group);
228 }
229
230 late_initcall(pm_init);