354 lines
6.2 KiB
C
354 lines
6.2 KiB
C
/*
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* FR-V Power Management Routines
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*
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* Copyright (c) 2004 Red Hat, Inc.
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*
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* Based on SA1100 version:
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* Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License.
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*
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/pm.h>
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#include <linux/sched.h>
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#include <linux/interrupt.h>
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#include <linux/sysctl.h>
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#include <linux/errno.h>
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#include <linux/delay.h>
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#include <asm/uaccess.h>
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#include <asm/mb86943a.h>
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#include "local.h"
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/*
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* Debug macros
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*/
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#define DEBUG
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int pm_do_suspend(void)
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{
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local_irq_disable();
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__set_LEDS(0xb1);
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/* go zzz */
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frv_cpu_suspend(pdm_suspend_mode);
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__set_LEDS(0xb2);
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local_irq_enable();
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return 0;
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}
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static unsigned long __irq_mask;
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/*
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* Setup interrupt masks, etc to enable wakeup by power switch
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*/
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static void __default_power_switch_setup(void)
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{
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/* default is to mask all interrupt sources. */
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__irq_mask = *(unsigned long *)0xfeff9820;
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*(unsigned long *)0xfeff9820 = 0xfffe0000;
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}
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/*
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* Cleanup interrupt masks, etc after wakeup by power switch
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*/
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static void __default_power_switch_cleanup(void)
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{
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*(unsigned long *)0xfeff9820 = __irq_mask;
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}
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/*
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* Return non-zero if wakeup irq was caused by power switch
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*/
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static int __default_power_switch_check(void)
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{
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return 1;
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}
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void (*__power_switch_wake_setup)(void) = __default_power_switch_setup;
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int (*__power_switch_wake_check)(void) = __default_power_switch_check;
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void (*__power_switch_wake_cleanup)(void) = __default_power_switch_cleanup;
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int pm_do_bus_sleep(void)
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{
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local_irq_disable();
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/*
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* Here is where we need some platform-dependent setup
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* of the interrupt state so that appropriate wakeup
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* sources are allowed and all others are masked.
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*/
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__power_switch_wake_setup();
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__set_LEDS(0xa1);
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/* go zzz
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*
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* This is in a loop in case power switch shares an irq with other
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* devices. The wake_check() tells us if we need to finish waking
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* or go back to sleep.
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*/
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do {
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frv_cpu_suspend(HSR0_PDM_BUS_SLEEP);
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} while (__power_switch_wake_check && !__power_switch_wake_check());
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__set_LEDS(0xa2);
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/*
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* Here is where we need some platform-dependent restore
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* of the interrupt state prior to being called.
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*/
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__power_switch_wake_cleanup();
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local_irq_enable();
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return 0;
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}
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unsigned long sleep_phys_sp(void *sp)
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{
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return virt_to_phys(sp);
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}
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#ifdef CONFIG_SYSCTL
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/*
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* Use a temporary sysctl number. Horrid, but will be cleaned up in 2.6
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* when all the PM interfaces exist nicely.
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*/
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#define CTL_PM_SUSPEND 1
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#define CTL_PM_CMODE 2
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#define CTL_PM_P0 4
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#define CTL_PM_CM 5
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static int user_atoi(char __user *ubuf, size_t len)
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{
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char buf[16];
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unsigned long ret;
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if (len > 15)
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return -EINVAL;
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if (copy_from_user(buf, ubuf, len))
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return -EFAULT;
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buf[len] = 0;
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ret = simple_strtoul(buf, NULL, 0);
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if (ret > INT_MAX)
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return -ERANGE;
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return ret;
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}
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/*
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* Send us to sleep.
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*/
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static int sysctl_pm_do_suspend(ctl_table *ctl, int write,
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void __user *buffer, size_t *lenp, loff_t *fpos)
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{
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int retval, mode;
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if (*lenp <= 0)
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return -EIO;
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mode = user_atoi(buffer, *lenp);
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if ((mode != 1) && (mode != 5))
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return -EINVAL;
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if (retval == 0) {
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if (mode == 5)
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retval = pm_do_bus_sleep();
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else
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retval = pm_do_suspend();
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}
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return retval;
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}
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static int try_set_cmode(int new_cmode)
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{
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if (new_cmode > 15)
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return -EINVAL;
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if (!(clock_cmodes_permitted & (1<<new_cmode)))
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return -EINVAL;
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/* now change cmode */
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local_irq_disable();
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frv_dma_pause_all();
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frv_change_cmode(new_cmode);
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determine_clocks(0);
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time_divisor_init();
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#ifdef DEBUG
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determine_clocks(1);
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#endif
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frv_dma_resume_all();
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local_irq_enable();
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return 0;
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}
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static int cmode_procctl(ctl_table *ctl, int write,
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void __user *buffer, size_t *lenp, loff_t *fpos)
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{
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int new_cmode;
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if (!write)
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return proc_dointvec(ctl, write, buffer, lenp, fpos);
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new_cmode = user_atoi(buffer, *lenp);
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return try_set_cmode(new_cmode)?:*lenp;
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}
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static int try_set_p0(int new_p0)
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{
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unsigned long flags, clkc;
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if (new_p0 < 0 || new_p0 > 1)
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return -EINVAL;
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local_irq_save(flags);
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__set_PSR(flags & ~PSR_ET);
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frv_dma_pause_all();
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clkc = __get_CLKC();
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if (new_p0)
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clkc |= CLKC_P0;
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else
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clkc &= ~CLKC_P0;
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__set_CLKC(clkc);
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determine_clocks(0);
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time_divisor_init();
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#ifdef DEBUG
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determine_clocks(1);
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#endif
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frv_dma_resume_all();
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local_irq_restore(flags);
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return 0;
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}
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static int try_set_cm(int new_cm)
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{
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unsigned long flags, clkc;
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if (new_cm < 0 || new_cm > 1)
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return -EINVAL;
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local_irq_save(flags);
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__set_PSR(flags & ~PSR_ET);
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frv_dma_pause_all();
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clkc = __get_CLKC();
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clkc &= ~CLKC_CM;
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clkc |= new_cm;
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__set_CLKC(clkc);
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determine_clocks(0);
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time_divisor_init();
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#if 1 //def DEBUG
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determine_clocks(1);
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#endif
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frv_dma_resume_all();
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local_irq_restore(flags);
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return 0;
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}
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static int p0_procctl(ctl_table *ctl, int write,
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void __user *buffer, size_t *lenp, loff_t *fpos)
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{
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int new_p0;
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if (!write)
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return proc_dointvec(ctl, write, buffer, lenp, fpos);
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new_p0 = user_atoi(buffer, *lenp);
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return try_set_p0(new_p0)?:*lenp;
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}
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static int cm_procctl(ctl_table *ctl, int write,
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void __user *buffer, size_t *lenp, loff_t *fpos)
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{
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int new_cm;
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if (!write)
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return proc_dointvec(ctl, write, buffer, lenp, fpos);
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new_cm = user_atoi(buffer, *lenp);
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return try_set_cm(new_cm)?:*lenp;
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}
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static struct ctl_table pm_table[] =
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{
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{
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.procname = "suspend",
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.data = NULL,
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.maxlen = 0,
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.mode = 0200,
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.proc_handler = sysctl_pm_do_suspend,
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},
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{
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.procname = "cmode",
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.data = &clock_cmode_current,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = cmode_procctl,
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},
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{
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.procname = "p0",
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.data = &clock_p0_current,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = p0_procctl,
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},
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{
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.procname = "cm",
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.data = &clock_cm_current,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = cm_procctl,
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},
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{ }
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};
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static struct ctl_table pm_dir_table[] =
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{
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{
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.procname = "pm",
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.mode = 0555,
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.child = pm_table,
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},
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{ }
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};
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/*
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* Initialize power interface
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*/
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static int __init pm_init(void)
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{
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register_sysctl_table(pm_dir_table);
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return 0;
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}
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__initcall(pm_init);
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#endif
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