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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/frv/kernel/pm.c
downloadconfigs-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/frv/kernel/pm.c')
-rw-r--r--arch/frv/kernel/pm.c432
1 files changed, 432 insertions, 0 deletions
diff --git a/arch/frv/kernel/pm.c b/arch/frv/kernel/pm.c
new file mode 100644
index 00000000000..1a1e8a119c3
--- /dev/null
+++ b/arch/frv/kernel/pm.c
@@ -0,0 +1,432 @@
+/*
+ * FR-V Power Management Routines
+ *
+ * Copyright (c) 2004 Red Hat, Inc.
+ *
+ * Based on SA1100 version:
+ * Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License.
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/pm.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/sysctl.h>
+#include <linux/errno.h>
+#include <linux/delay.h>
+#include <asm/uaccess.h>
+
+#include <asm/mb86943a.h>
+
+#include "local.h"
+
+void (*pm_power_off)(void);
+
+extern void frv_change_cmode(int);
+
+/*
+ * Debug macros
+ */
+#define DEBUG
+
+int pm_do_suspend(void)
+{
+ local_irq_disable();
+
+ __set_LEDS(0xb1);
+
+ /* go zzz */
+ frv_cpu_suspend(pdm_suspend_mode);
+
+ __set_LEDS(0xb2);
+
+ local_irq_enable();
+
+ return 0;
+}
+
+static unsigned long __irq_mask;
+
+/*
+ * Setup interrupt masks, etc to enable wakeup by power switch
+ */
+static void __default_power_switch_setup(void)
+{
+ /* default is to mask all interrupt sources. */
+ __irq_mask = *(unsigned long *)0xfeff9820;
+ *(unsigned long *)0xfeff9820 = 0xfffe0000;
+}
+
+/*
+ * Cleanup interrupt masks, etc after wakeup by power switch
+ */
+static void __default_power_switch_cleanup(void)
+{
+ *(unsigned long *)0xfeff9820 = __irq_mask;
+}
+
+/*
+ * Return non-zero if wakeup irq was caused by power switch
+ */
+static int __default_power_switch_check(void)
+{
+ return 1;
+}
+
+void (*__power_switch_wake_setup)(void) = __default_power_switch_setup;
+int (*__power_switch_wake_check)(void) = __default_power_switch_check;
+void (*__power_switch_wake_cleanup)(void) = __default_power_switch_cleanup;
+
+int pm_do_bus_sleep(void)
+{
+ local_irq_disable();
+
+ /*
+ * Here is where we need some platform-dependent setup
+ * of the interrupt state so that appropriate wakeup
+ * sources are allowed and all others are masked.
+ */
+ __power_switch_wake_setup();
+
+ __set_LEDS(0xa1);
+
+ /* go zzz
+ *
+ * This is in a loop in case power switch shares an irq with other
+ * devices. The wake_check() tells us if we need to finish waking
+ * or go back to sleep.
+ */
+ do {
+ frv_cpu_suspend(HSR0_PDM_BUS_SLEEP);
+ } while (__power_switch_wake_check && !__power_switch_wake_check());
+
+ __set_LEDS(0xa2);
+
+ /*
+ * Here is where we need some platform-dependent restore
+ * of the interrupt state prior to being called.
+ */
+ __power_switch_wake_cleanup();
+
+ local_irq_enable();
+
+ return 0;
+}
+
+unsigned long sleep_phys_sp(void *sp)
+{
+ return virt_to_phys(sp);
+}
+
+#ifdef CONFIG_SYSCTL
+/*
+ * Use a temporary sysctl number. Horrid, but will be cleaned up in 2.6
+ * when all the PM interfaces exist nicely.
+ */
+#define CTL_PM 9899
+#define CTL_PM_SUSPEND 1
+#define CTL_PM_CMODE 2
+#define CTL_PM_P0 4
+#define CTL_PM_CM 5
+
+static int user_atoi(char *ubuf, size_t len)
+{
+ char buf[16];
+ unsigned long ret;
+
+ if (len > 15)
+ return -EINVAL;
+
+ if (copy_from_user(buf, ubuf, len))
+ return -EFAULT;
+
+ buf[len] = 0;
+ ret = simple_strtoul(buf, NULL, 0);
+ if (ret > INT_MAX)
+ return -ERANGE;
+ return ret;
+}
+
+/*
+ * Send us to sleep.
+ */
+static int sysctl_pm_do_suspend(ctl_table *ctl, int write, struct file *filp,
+ void *buffer, size_t *lenp, loff_t *fpos)
+{
+ int retval, mode;
+
+ if (*lenp <= 0)
+ return -EIO;
+
+ mode = user_atoi(buffer, *lenp);
+ if ((mode != 1) && (mode != 5))
+ return -EINVAL;
+
+ retval = pm_send_all(PM_SUSPEND, (void *)3);
+
+ if (retval == 0) {
+ if (mode == 5)
+ retval = pm_do_bus_sleep();
+ else
+ retval = pm_do_suspend();
+ pm_send_all(PM_RESUME, (void *)0);
+ }
+
+ return retval;
+}
+
+static int try_set_cmode(int new_cmode)
+{
+ if (new_cmode > 15)
+ return -EINVAL;
+ if (!(clock_cmodes_permitted & (1<<new_cmode)))
+ return -EINVAL;
+
+ /* tell all the drivers we're suspending */
+ pm_send_all(PM_SUSPEND, (void *)3);
+
+ /* now change cmode */
+ local_irq_disable();
+ frv_dma_pause_all();
+
+ frv_change_cmode(new_cmode);
+
+ determine_clocks(0);
+ time_divisor_init();
+
+#ifdef DEBUG
+ determine_clocks(1);
+#endif
+ frv_dma_resume_all();
+ local_irq_enable();
+
+ /* tell all the drivers we're resuming */
+ pm_send_all(PM_RESUME, (void *)0);
+ return 0;
+}
+
+
+static int cmode_procctl(ctl_table *ctl, int write, struct file *filp,
+ void *buffer, size_t *lenp, loff_t *fpos)
+{
+ int new_cmode;
+
+ if (!write)
+ return proc_dointvec(ctl, write, filp, buffer, lenp, fpos);
+
+ new_cmode = user_atoi(buffer, *lenp);
+
+ return try_set_cmode(new_cmode)?:*lenp;
+}
+
+static int cmode_sysctl(ctl_table *table, int *name, int nlen,
+ void *oldval, size_t *oldlenp,
+ void *newval, size_t newlen, void **context)
+{
+ if (oldval && oldlenp) {
+ size_t oldlen;
+
+ if (get_user(oldlen, oldlenp))
+ return -EFAULT;
+
+ if (oldlen != sizeof(int))
+ return -EINVAL;
+
+ if (put_user(clock_cmode_current, (unsigned int *)oldval) ||
+ put_user(sizeof(int), oldlenp))
+ return -EFAULT;
+ }
+ if (newval && newlen) {
+ int new_cmode;
+
+ if (newlen != sizeof(int))
+ return -EINVAL;
+
+ if (get_user(new_cmode, (int *)newval))
+ return -EFAULT;
+
+ return try_set_cmode(new_cmode)?:1;
+ }
+ return 1;
+}
+
+static int try_set_p0(int new_p0)
+{
+ unsigned long flags, clkc;
+
+ if (new_p0 < 0 || new_p0 > 1)
+ return -EINVAL;
+
+ local_irq_save(flags);
+ __set_PSR(flags & ~PSR_ET);
+
+ frv_dma_pause_all();
+
+ clkc = __get_CLKC();
+ if (new_p0)
+ clkc |= CLKC_P0;
+ else
+ clkc &= ~CLKC_P0;
+ __set_CLKC(clkc);
+
+ determine_clocks(0);
+ time_divisor_init();
+
+#ifdef DEBUG
+ determine_clocks(1);
+#endif
+ frv_dma_resume_all();
+ local_irq_restore(flags);
+ return 0;
+}
+
+static int try_set_cm(int new_cm)
+{
+ unsigned long flags, clkc;
+
+ if (new_cm < 0 || new_cm > 1)
+ return -EINVAL;
+
+ local_irq_save(flags);
+ __set_PSR(flags & ~PSR_ET);
+
+ frv_dma_pause_all();
+
+ clkc = __get_CLKC();
+ clkc &= ~CLKC_CM;
+ clkc |= new_cm;
+ __set_CLKC(clkc);
+
+ determine_clocks(0);
+ time_divisor_init();
+
+#if 1 //def DEBUG
+ determine_clocks(1);
+#endif
+
+ frv_dma_resume_all();
+ local_irq_restore(flags);
+ return 0;
+}
+
+static int p0_procctl(ctl_table *ctl, int write, struct file *filp,
+ void *buffer, size_t *lenp, loff_t *fpos)
+{
+ int new_p0;
+
+ if (!write)
+ return proc_dointvec(ctl, write, filp, buffer, lenp, fpos);
+
+ new_p0 = user_atoi(buffer, *lenp);
+
+ return try_set_p0(new_p0)?:*lenp;
+}
+
+static int p0_sysctl(ctl_table *table, int *name, int nlen,
+ void *oldval, size_t *oldlenp,
+ void *newval, size_t newlen, void **context)
+{
+ if (oldval && oldlenp) {
+ size_t oldlen;
+
+ if (get_user(oldlen, oldlenp))
+ return -EFAULT;
+
+ if (oldlen != sizeof(int))
+ return -EINVAL;
+
+ if (put_user(clock_p0_current, (unsigned int *)oldval) ||
+ put_user(sizeof(int), oldlenp))
+ return -EFAULT;
+ }
+ if (newval && newlen) {
+ int new_p0;
+
+ if (newlen != sizeof(int))
+ return -EINVAL;
+
+ if (get_user(new_p0, (int *)newval))
+ return -EFAULT;
+
+ return try_set_p0(new_p0)?:1;
+ }
+ return 1;
+}
+
+static int cm_procctl(ctl_table *ctl, int write, struct file *filp,
+ void *buffer, size_t *lenp, loff_t *fpos)
+{
+ int new_cm;
+
+ if (!write)
+ return proc_dointvec(ctl, write, filp, buffer, lenp, fpos);
+
+ new_cm = user_atoi(buffer, *lenp);
+
+ return try_set_cm(new_cm)?:*lenp;
+}
+
+static int cm_sysctl(ctl_table *table, int *name, int nlen,
+ void *oldval, size_t *oldlenp,
+ void *newval, size_t newlen, void **context)
+{
+ if (oldval && oldlenp) {
+ size_t oldlen;
+
+ if (get_user(oldlen, oldlenp))
+ return -EFAULT;
+
+ if (oldlen != sizeof(int))
+ return -EINVAL;
+
+ if (put_user(clock_cm_current, (unsigned int *)oldval) ||
+ put_user(sizeof(int), oldlenp))
+ return -EFAULT;
+ }
+ if (newval && newlen) {
+ int new_cm;
+
+ if (newlen != sizeof(int))
+ return -EINVAL;
+
+ if (get_user(new_cm, (int *)newval))
+ return -EFAULT;
+
+ return try_set_cm(new_cm)?:1;
+ }
+ return 1;
+}
+
+
+static struct ctl_table pm_table[] =
+{
+ {CTL_PM_SUSPEND, "suspend", NULL, 0, 0200, NULL, &sysctl_pm_do_suspend},
+ {CTL_PM_CMODE, "cmode", &clock_cmode_current, sizeof(int), 0644, NULL, &cmode_procctl, &cmode_sysctl, NULL},
+ {CTL_PM_P0, "p0", &clock_p0_current, sizeof(int), 0644, NULL, &p0_procctl, &p0_sysctl, NULL},
+ {CTL_PM_CM, "cm", &clock_cm_current, sizeof(int), 0644, NULL, &cm_procctl, &cm_sysctl, NULL},
+ {0}
+};
+
+static struct ctl_table pm_dir_table[] =
+{
+ {CTL_PM, "pm", NULL, 0, 0555, pm_table},
+ {0}
+};
+
+/*
+ * Initialize power interface
+ */
+static int __init pm_init(void)
+{
+ register_sysctl_table(pm_dir_table, 1);
+ return 0;
+}
+
+__initcall(pm_init);
+
+#endif