From 61f9c58da57a80b0df1ced18a28cbbaebd4d417a Mon Sep 17 00:00:00 2001 From: Manuel Lauss Date: Sun, 21 Dec 2008 09:26:27 +0100 Subject: MIPS: Alchemy: new userspace suspend interface for development boards. Replace the current sysctl-based suspend interface with a new sysfs- based one which also uses the Linux-2.6 suspend model. To configure wakeup sources, a subtree for the demoboards is created under /sys/power/db1x: sys/ `-- power `-- db1x |-- gpio0 |-- gpio1 |-- gpio2 |-- gpio3 |-- gpio4 |-- gpio5 |-- gpio6 |-- gpio7 |-- timer |-- timer_timeout |-- wakemsk `-- wakesrc The nodes 'gpio[0-7]' and 'timer' configure the GPIO0..7 and M2 bits of the SYS_WAKEMSK (wakeup source enable) register. Writing '1' enables a wakesource, 0 disables it. The 'timer_timeout' node holds the timeout in seconds after which the TOYMATCH2 event should wake the system. The 'wakesrc' node holds the SYS_WAKESRC register after wakeup (in hex), the 'wakemsk' node can be used to get/set the wakeup mask directly. For example, to have the timer wake the system after 10 seconds of sleep, the following must be done in userspace: echo 10 > /sys/power/db1x/timer_timeout echo 1 > /sys/power/db1x/timer echo mem > /sys/power/sleep This patch also removes the homebrew CPU frequency switching code. I don't understand how it could have ever worked reliably; it does not communicate the clock changes to peripheral devices other than uarts. Signed-off-by: Manuel Lauss Signed-off-by: Ralf Baechle create mode 100644 arch/mips/alchemy/devboards/pm.c --- arch/mips/alchemy/devboards/pm.c | 229 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 229 insertions(+) create mode 100644 arch/mips/alchemy/devboards/pm.c (limited to 'arch/mips/alchemy/devboards/pm.c') diff --git a/arch/mips/alchemy/devboards/pm.c b/arch/mips/alchemy/devboards/pm.c new file mode 100644 index 00000000000..d5eb9c325ed --- /dev/null +++ b/arch/mips/alchemy/devboards/pm.c @@ -0,0 +1,229 @@ +/* + * Alchemy Development Board example suspend userspace interface. + * + * (c) 2008 Manuel Lauss + */ + +#include +#include +#include +#include +#include + +/* + * Generic suspend userspace interface for Alchemy development boards. + * This code exports a few sysfs nodes under /sys/power/db1x/ which + * can be used by userspace to en/disable all au1x-provided wakeup + * sources and configure the timeout after which the the TOYMATCH2 irq + * is to trigger a wakeup. + */ + + +static unsigned long db1x_pm_sleep_secs; +static unsigned long db1x_pm_wakemsk; +static unsigned long db1x_pm_last_wakesrc; + +static int db1x_pm_enter(suspend_state_t state) +{ + /* enable GPIO based wakeup */ + au_writel(1, SYS_PININPUTEN); + + /* clear and setup wake cause and source */ + au_writel(0, SYS_WAKEMSK); + au_sync(); + au_writel(0, SYS_WAKESRC); + au_sync(); + + au_writel(db1x_pm_wakemsk, SYS_WAKEMSK); + au_sync(); + + /* setup 1Hz-timer-based wakeup: wait for reg access */ + while (au_readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_M20) + asm volatile ("nop"); + + au_writel(au_readl(SYS_TOYREAD) + db1x_pm_sleep_secs, SYS_TOYMATCH2); + au_sync(); + + /* wait for value to really hit the register */ + while (au_readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_M20) + asm volatile ("nop"); + + /* ...and now the sandman can come! */ + au_sleep(); + + return 0; +} + +static int db1x_pm_begin(suspend_state_t state) +{ + if (!db1x_pm_wakemsk) { + printk(KERN_ERR "db1x: no wakeup source activated!\n"); + return -EINVAL; + } + + return 0; +} + +static void db1x_pm_end(void) +{ + /* read and store wakeup source, the clear the register. To + * be able to clear it, WAKEMSK must be cleared first. + */ + db1x_pm_last_wakesrc = au_readl(SYS_WAKESRC); + + au_writel(0, SYS_WAKEMSK); + au_writel(0, SYS_WAKESRC); + au_sync(); + +} + +static struct platform_suspend_ops db1x_pm_ops = { + .valid = suspend_valid_only_mem, + .begin = db1x_pm_begin, + .enter = db1x_pm_enter, + .end = db1x_pm_end, +}; + +#define ATTRCMP(x) (0 == strcmp(attr->attr.name, #x)) + +static ssize_t db1x_pmattr_show(struct kobject *kobj, + struct kobj_attribute *attr, + char *buf) +{ + int idx; + + if (ATTRCMP(timer_timeout)) + return sprintf(buf, "%lu\n", db1x_pm_sleep_secs); + + else if (ATTRCMP(timer)) + return sprintf(buf, "%u\n", + !!(db1x_pm_wakemsk & SYS_WAKEMSK_M2)); + + else if (ATTRCMP(wakesrc)) + return sprintf(buf, "%lu\n", db1x_pm_last_wakesrc); + + else if (ATTRCMP(gpio0) || ATTRCMP(gpio1) || ATTRCMP(gpio2) || + ATTRCMP(gpio3) || ATTRCMP(gpio4) || ATTRCMP(gpio5) || + ATTRCMP(gpio6) || ATTRCMP(gpio7)) { + idx = (attr->attr.name)[4] - '0'; + return sprintf(buf, "%d\n", + !!(db1x_pm_wakemsk & SYS_WAKEMSK_GPIO(idx))); + + } else if (ATTRCMP(wakemsk)) { + return sprintf(buf, "%08lx\n", db1x_pm_wakemsk); + } + + return -ENOENT; +} + +static ssize_t db1x_pmattr_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *instr, + size_t bytes) +{ + unsigned long l; + int tmp; + + if (ATTRCMP(timer_timeout)) { + tmp = strict_strtoul(instr, 0, &l); + if (tmp) + return tmp; + + db1x_pm_sleep_secs = l; + + } else if (ATTRCMP(timer)) { + if (instr[0] != '0') + db1x_pm_wakemsk |= SYS_WAKEMSK_M2; + else + db1x_pm_wakemsk &= ~SYS_WAKEMSK_M2; + + } else if (ATTRCMP(gpio0) || ATTRCMP(gpio1) || ATTRCMP(gpio2) || + ATTRCMP(gpio3) || ATTRCMP(gpio4) || ATTRCMP(gpio5) || + ATTRCMP(gpio6) || ATTRCMP(gpio7)) { + tmp = (attr->attr.name)[4] - '0'; + if (instr[0] != '0') { + db1x_pm_wakemsk |= SYS_WAKEMSK_GPIO(tmp); + } else { + db1x_pm_wakemsk &= ~SYS_WAKEMSK_GPIO(tmp); + } + + } else if (ATTRCMP(wakemsk)) { + tmp = strict_strtoul(instr, 0, &l); + if (tmp) + return tmp; + + db1x_pm_wakemsk = l & 0x0000003f; + + } else + bytes = -ENOENT; + + return bytes; +} + +#define ATTR(x) \ + static struct kobj_attribute x##_attribute = \ + __ATTR(x, 0664, db1x_pmattr_show, \ + db1x_pmattr_store); + +ATTR(gpio0) /* GPIO-based wakeup enable */ +ATTR(gpio1) +ATTR(gpio2) +ATTR(gpio3) +ATTR(gpio4) +ATTR(gpio5) +ATTR(gpio6) +ATTR(gpio7) +ATTR(timer) /* TOYMATCH2-based wakeup enable */ +ATTR(timer_timeout) /* timer-based wakeup timeout value, in seconds */ +ATTR(wakesrc) /* contents of SYS_WAKESRC after last wakeup */ +ATTR(wakemsk) /* direct access to SYS_WAKEMSK */ + +#define ATTR_LIST(x) & x ## _attribute.attr +static struct attribute *db1x_pmattrs[] = { + ATTR_LIST(gpio0), + ATTR_LIST(gpio1), + ATTR_LIST(gpio2), + ATTR_LIST(gpio3), + ATTR_LIST(gpio4), + ATTR_LIST(gpio5), + ATTR_LIST(gpio6), + ATTR_LIST(gpio7), + ATTR_LIST(timer), + ATTR_LIST(timer_timeout), + ATTR_LIST(wakesrc), + ATTR_LIST(wakemsk), + NULL, /* terminator */ +}; + +static struct attribute_group db1x_pmattr_group = { + .name = "db1x", + .attrs = db1x_pmattrs, +}; + +/* + * Initialize suspend interface + */ +static int __init pm_init(void) +{ + /* init TOY to tick at 1Hz if not already done. No need to wait + * for confirmation since there's plenty of time from here to + * the next suspend cycle. + */ + if (au_readl(SYS_TOYTRIM) != 32767) { + au_writel(32767, SYS_TOYTRIM); + au_sync(); + } + + db1x_pm_last_wakesrc = au_readl(SYS_WAKESRC); + + au_writel(0, SYS_WAKESRC); + au_sync(); + au_writel(0, SYS_WAKEMSK); + au_sync(); + + suspend_set_ops(&db1x_pm_ops); + + return sysfs_create_group(power_kobj, &db1x_pmattr_group); +} + +late_initcall(pm_init); -- cgit v1.2.3