Initial import

1 files changed, 352 insertions, 0 deletions

diff --git a/arch/frv/kernel/pm.c b/arch/frv/kernel/pm.c
new file mode 100644
index 000000000..ac767d94a
--- /dev/null
+++ b/arch/frv/kernel/pm.c
@@ -0,0 +1,352 @@
+/*
+ * 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/init.h>
+#include <linux/module.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"
+
+/*
+ * 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_SUSPEND 1
+#define CTL_PM_CMODE 2
+#define CTL_PM_P0 4
+#define CTL_PM_CM 5
+
+static int user_atoi(char __user *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(struct ctl_table *ctl, int write,
+				void __user *buffer, size_t *lenp, loff_t *fpos)
+{
+	int mode;
+
+	if (*lenp <= 0)
+		return -EIO;
+
+	mode = user_atoi(buffer, *lenp);
+	switch (mode) {
+	case 1:
+	    return pm_do_suspend();
+
+	case 5:
+	    return pm_do_bus_sleep();
+
+	default:
+	    return -EINVAL;
+	}
+}
+
+static int try_set_cmode(int new_cmode)
+{
+	if (new_cmode > 15)
+		return -EINVAL;
+	if (!(clock_cmodes_permitted & (1<<new_cmode)))
+		return -EINVAL;
+
+	/* 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();
+
+	return 0;
+}
+
+
+static int cmode_procctl(struct ctl_table *ctl, int write,
+			 void __user *buffer, size_t *lenp, loff_t *fpos)
+{
+	int new_cmode;
+
+	if (!write)
+		return proc_dointvec(ctl, write, buffer, lenp, fpos);
+
+	new_cmode = user_atoi(buffer, *lenp);
+
+	return try_set_cmode(new_cmode)?:*lenp;
+}
+
+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(struct ctl_table *ctl, int write,
+		      void __user *buffer, size_t *lenp, loff_t *fpos)
+{
+	int new_p0;
+
+	if (!write)
+		return proc_dointvec(ctl, write, buffer, lenp, fpos);
+
+	new_p0 = user_atoi(buffer, *lenp);
+
+	return try_set_p0(new_p0)?:*lenp;
+}
+
+static int cm_procctl(struct ctl_table *ctl, int write,
+		      void __user *buffer, size_t *lenp, loff_t *fpos)
+{
+	int new_cm;
+
+	if (!write)
+		return proc_dointvec(ctl, write, buffer, lenp, fpos);
+
+	new_cm = user_atoi(buffer, *lenp);
+
+	return try_set_cm(new_cm)?:*lenp;
+}
+
+static struct ctl_table pm_table[] =
+{
+	{
+		.procname	= "suspend",
+		.data		= NULL,
+		.maxlen		= 0,
+		.mode		= 0200,
+		.proc_handler	= sysctl_pm_do_suspend,
+	},
+	{
+		.procname	= "cmode",
+		.data		= &clock_cmode_current,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= cmode_procctl,
+	},
+	{
+		.procname	= "p0",
+		.data		= &clock_p0_current,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= p0_procctl,
+	},
+	{
+		.procname	= "cm",
+		.data		= &clock_cm_current,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= cm_procctl,
+	},
+	{ }
+};
+
+static struct ctl_table pm_dir_table[] =
+{
+	{
+		.procname	= "pm",
+		.mode		= 0555,
+		.child		= pm_table,
+	},
+	{ }
+};
+
+/*
+ * Initialize power interface
+ */
+static int __init pm_init(void)
+{
+	register_sysctl_table(pm_dir_table);
+	return 0;
+}
+
+__initcall(pm_init);
+
+#endif