Commit | Line | Data |
---|---|---|
61f9c58d ML |
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> | |
ce65cc8f | 12 | #include <asm/mach-au1x00/gpio.h> |
61f9c58d ML |
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 */ | |
ce65cc8f | 30 | alchemy_gpio1_input_enable(); |
61f9c58d ML |
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); |