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#include <asm/mach-db1x00/bcsr.h> 14 15/* 16 * Generic suspend userspace interface for Alchemy development boards. 17 * This code exports a few sysfs nodes under /sys/power/db1x/ which 18 * can be used by userspace to en/disable all au1x-provided wakeup 19 * sources and configure the timeout after which the the TOYMATCH2 irq 20 * is to trigger a wakeup. 21 */ 22 23 24static unsigned long db1x_pm_sleep_secs; 25static unsigned long db1x_pm_wakemsk; 26static unsigned long db1x_pm_last_wakesrc; 27 28static int db1x_pm_enter(suspend_state_t state) 29{ 30 unsigned short bcsrs[16]; 31 int i, j, hasint; 32 33 /* save CPLD regs */ 34 hasint = bcsr_read(BCSR_WHOAMI); 35 hasint = BCSR_WHOAMI_BOARD(hasint) >= BCSR_WHOAMI_DB1200; 36 j = (hasint) ? BCSR_MASKSET : BCSR_SYSTEM; 37 38 for (i = BCSR_STATUS; i <= j; i++) 39 bcsrs[i] = bcsr_read(i); 40 41 /* shut off hexleds */ 42 bcsr_write(BCSR_HEXCLEAR, 3); 43 44 /* enable GPIO based wakeup */ 45 alchemy_gpio1_input_enable(); 46 47 /* clear and setup wake cause and source */ 48 au_writel(0, SYS_WAKEMSK); 49 au_sync(); 50 au_writel(0, SYS_WAKESRC); 51 au_sync(); 52 53 au_writel(db1x_pm_wakemsk, SYS_WAKEMSK); 54 au_sync(); 55 56 /* setup 1Hz-timer-based wakeup: wait for reg access */ 57 while (au_readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_M20) 58 asm volatile ("nop"); 59 60 au_writel(au_readl(SYS_TOYREAD) + db1x_pm_sleep_secs, SYS_TOYMATCH2); 61 au_sync(); 62 63 /* wait for value to really hit the register */ 64 while (au_readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_M20) 65 asm volatile ("nop"); 66 67 /* ...and now the sandman can come! */ 68 au_sleep(); 69 70 71 /* restore CPLD regs */ 72 for (i = BCSR_STATUS; i <= BCSR_SYSTEM; i++) 73 bcsr_write(i, bcsrs[i]); 74 75 /* restore CPLD int registers */ 76 if (hasint) { 77 bcsr_write(BCSR_INTCLR, 0xffff); 78 bcsr_write(BCSR_MASKCLR, 0xffff); 79 bcsr_write(BCSR_INTSTAT, 0xffff); 80 bcsr_write(BCSR_INTSET, bcsrs[BCSR_INTSET]); 81 bcsr_write(BCSR_MASKSET, bcsrs[BCSR_MASKSET]); 82 } 83 84 /* light up hexleds */ 85 bcsr_write(BCSR_HEXCLEAR, 0); 86 87 return 0; 88} 89 90static int db1x_pm_begin(suspend_state_t state) 91{ 92 if (!db1x_pm_wakemsk) { 93 printk(KERN_ERR "db1x: no wakeup source activated!\n"); 94 return -EINVAL; 95 } 96 97 return 0; 98} 99 100static void db1x_pm_end(void) 101{ 102 /* read and store wakeup source, the clear the register. To 103 * be able to clear it, WAKEMSK must be cleared first. 104 */ 105 db1x_pm_last_wakesrc = au_readl(SYS_WAKESRC); 106 107 au_writel(0, SYS_WAKEMSK); 108 au_writel(0, SYS_WAKESRC); 109 au_sync(); 110 111} 112 113static const struct platform_suspend_ops db1x_pm_ops = { 114 .valid = suspend_valid_only_mem, 115 .begin = db1x_pm_begin, 116 .enter = db1x_pm_enter, 117 .end = db1x_pm_end, 118}; 119 120#define ATTRCMP(x) (0 == strcmp(attr->attr.name, #x)) 121 122static ssize_t db1x_pmattr_show(struct kobject *kobj, 123 struct kobj_attribute *attr, 124 char *buf) 125{ 126 int idx; 127 128 if (ATTRCMP(timer_timeout)) 129 return sprintf(buf, "%lu\n", db1x_pm_sleep_secs); 130 131 else if (ATTRCMP(timer)) 132 return sprintf(buf, "%u\n", 133 !!(db1x_pm_wakemsk & SYS_WAKEMSK_M2)); 134 135 else if (ATTRCMP(wakesrc)) 136 return sprintf(buf, "%lu\n", db1x_pm_last_wakesrc); 137 138 else if (ATTRCMP(gpio0) || ATTRCMP(gpio1) || ATTRCMP(gpio2) || 139 ATTRCMP(gpio3) || ATTRCMP(gpio4) || ATTRCMP(gpio5) || 140 ATTRCMP(gpio6) || ATTRCMP(gpio7)) { 141 idx = (attr->attr.name)[4] - '0'; 142 return sprintf(buf, "%d\n", 143 !!(db1x_pm_wakemsk & SYS_WAKEMSK_GPIO(idx))); 144 145 } else if (ATTRCMP(wakemsk)) { 146 return sprintf(buf, "%08lx\n", db1x_pm_wakemsk); 147 } 148 149 return -ENOENT; 150} 151 152static ssize_t db1x_pmattr_store(struct kobject *kobj, 153 struct kobj_attribute *attr, 154 const char *instr, 155 size_t bytes) 156{ 157 unsigned long l; 158 int tmp; 159 160 if (ATTRCMP(timer_timeout)) { 161 tmp = strict_strtoul(instr, 0, &l); 162 if (tmp) 163 return tmp; 164 165 db1x_pm_sleep_secs = l; 166 167 } else if (ATTRCMP(timer)) { 168 if (instr[0] != '0') 169 db1x_pm_wakemsk |= SYS_WAKEMSK_M2; 170 else 171 db1x_pm_wakemsk &= ~SYS_WAKEMSK_M2; 172 173 } else if (ATTRCMP(gpio0) || ATTRCMP(gpio1) || ATTRCMP(gpio2) || 174 ATTRCMP(gpio3) || ATTRCMP(gpio4) || ATTRCMP(gpio5) || 175 ATTRCMP(gpio6) || ATTRCMP(gpio7)) { 176 tmp = (attr->attr.name)[4] - '0'; 177 if (instr[0] != '0') { 178 db1x_pm_wakemsk |= SYS_WAKEMSK_GPIO(tmp); 179 } else { 180 db1x_pm_wakemsk &= ~SYS_WAKEMSK_GPIO(tmp); 181 } 182 183 } else if (ATTRCMP(wakemsk)) { 184 tmp = strict_strtoul(instr, 0, &l); 185 if (tmp) 186 return tmp; 187 188 db1x_pm_wakemsk = l & 0x0000003f; 189 190 } else 191 bytes = -ENOENT; 192 193 return bytes; 194} 195 196#define ATTR(x) \ 197 static struct kobj_attribute x##_attribute = \ 198 __ATTR(x, 0664, db1x_pmattr_show, \ 199 db1x_pmattr_store); 200 201ATTR(gpio0) /* GPIO-based wakeup enable */ 202ATTR(gpio1) 203ATTR(gpio2) 204ATTR(gpio3) 205ATTR(gpio4) 206ATTR(gpio5) 207ATTR(gpio6) 208ATTR(gpio7) 209ATTR(timer) /* TOYMATCH2-based wakeup enable */ 210ATTR(timer_timeout) /* timer-based wakeup timeout value, in seconds */ 211ATTR(wakesrc) /* contents of SYS_WAKESRC after last wakeup */ 212ATTR(wakemsk) /* direct access to SYS_WAKEMSK */ 213 214#define ATTR_LIST(x) & x ## _attribute.attr 215static struct attribute *db1x_pmattrs[] = { 216 ATTR_LIST(gpio0), 217 ATTR_LIST(gpio1), 218 ATTR_LIST(gpio2), 219 ATTR_LIST(gpio3), 220 ATTR_LIST(gpio4), 221 ATTR_LIST(gpio5), 222 ATTR_LIST(gpio6), 223 ATTR_LIST(gpio7), 224 ATTR_LIST(timer), 225 ATTR_LIST(timer_timeout), 226 ATTR_LIST(wakesrc), 227 ATTR_LIST(wakemsk), 228 NULL, /* terminator */ 229}; 230 231static struct attribute_group db1x_pmattr_group = { 232 .name = "db1x", 233 .attrs = db1x_pmattrs, 234}; 235 236/* 237 * Initialize suspend interface 238 */ 239static int __init pm_init(void) 240{ 241 /* init TOY to tick at 1Hz if not already done. No need to wait 242 * for confirmation since there's plenty of time from here to 243 * the next suspend cycle. 244 */ 245 if (au_readl(SYS_TOYTRIM) != 32767) { 246 au_writel(32767, SYS_TOYTRIM); 247 au_sync(); 248 } 249 250 db1x_pm_last_wakesrc = au_readl(SYS_WAKESRC); 251 252 au_writel(0, SYS_WAKESRC); 253 au_sync(); 254 au_writel(0, SYS_WAKEMSK); 255 au_sync(); 256 257 suspend_set_ops(&db1x_pm_ops); 258 259 return sysfs_create_group(power_kobj, &db1x_pmattr_group); 260} 261 262late_initcall(pm_init); 263