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); 231