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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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02bf89347c
Add code to keep track of supported sleep modes. This to only export cpuidle modes that are backed by board support code. Also, do not allow suspend-to-ram if sdram board code is missing. Signed-off-by: Magnus Damm <damm@opensource.se> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
120 lines
3.2 KiB
C
120 lines
3.2 KiB
C
/*
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* arch/sh/kernel/cpu/shmobile/cpuidle.c
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*
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* Cpuidle support code for SuperH Mobile
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*
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* Copyright (C) 2009 Magnus Damm
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/io.h>
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#include <linux/suspend.h>
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#include <linux/cpuidle.h>
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#include <asm/suspend.h>
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#include <asm/uaccess.h>
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#include <asm/hwblk.h>
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static unsigned long cpuidle_mode[] = {
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SUSP_SH_SLEEP, /* regular sleep mode */
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SUSP_SH_SLEEP | SUSP_SH_SF, /* sleep mode + self refresh */
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SUSP_SH_STANDBY | SUSP_SH_SF, /* software standby mode + self refresh */
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};
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static int cpuidle_sleep_enter(struct cpuidle_device *dev,
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struct cpuidle_state *state)
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{
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unsigned long allowed_mode = arch_hwblk_sleep_mode();
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ktime_t before, after;
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int requested_state = state - &dev->states[0];
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int allowed_state;
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int k;
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/* convert allowed mode to allowed state */
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for (k = ARRAY_SIZE(cpuidle_mode) - 1; k > 0; k--)
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if (cpuidle_mode[k] == allowed_mode)
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break;
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allowed_state = k;
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/* take the following into account for sleep mode selection:
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* - allowed_state: best mode allowed by hardware (clock deps)
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* - requested_state: best mode allowed by software (latencies)
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*/
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k = min_t(int, allowed_state, requested_state);
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dev->last_state = &dev->states[k];
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before = ktime_get();
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sh_mobile_call_standby(cpuidle_mode[k]);
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after = ktime_get();
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return ktime_to_ns(ktime_sub(after, before)) >> 10;
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}
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static struct cpuidle_device cpuidle_dev;
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static struct cpuidle_driver cpuidle_driver = {
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.name = "sh_idle",
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.owner = THIS_MODULE,
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};
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void sh_mobile_setup_cpuidle(void)
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{
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struct cpuidle_device *dev = &cpuidle_dev;
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struct cpuidle_state *state;
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int i;
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cpuidle_register_driver(&cpuidle_driver);
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for (i = 0; i < CPUIDLE_STATE_MAX; i++) {
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dev->states[i].name[0] = '\0';
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dev->states[i].desc[0] = '\0';
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}
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i = CPUIDLE_DRIVER_STATE_START;
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state = &dev->states[i++];
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snprintf(state->name, CPUIDLE_NAME_LEN, "C0");
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strncpy(state->desc, "SuperH Sleep Mode", CPUIDLE_DESC_LEN);
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state->exit_latency = 1;
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state->target_residency = 1 * 2;
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state->power_usage = 3;
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state->flags = 0;
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state->flags |= CPUIDLE_FLAG_SHALLOW;
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state->flags |= CPUIDLE_FLAG_TIME_VALID;
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state->enter = cpuidle_sleep_enter;
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dev->safe_state = state;
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if (sh_mobile_sleep_supported & SUSP_SH_SF) {
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state = &dev->states[i++];
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snprintf(state->name, CPUIDLE_NAME_LEN, "C1");
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strncpy(state->desc, "SuperH Sleep Mode [SF]",
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CPUIDLE_DESC_LEN);
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state->exit_latency = 100;
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state->target_residency = 1 * 2;
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state->power_usage = 1;
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state->flags = 0;
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state->flags |= CPUIDLE_FLAG_TIME_VALID;
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state->enter = cpuidle_sleep_enter;
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}
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if (sh_mobile_sleep_supported & SUSP_SH_STANDBY) {
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state = &dev->states[i++];
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snprintf(state->name, CPUIDLE_NAME_LEN, "C2");
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strncpy(state->desc, "SuperH Mobile Standby Mode [SF]",
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CPUIDLE_DESC_LEN);
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state->exit_latency = 2300;
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state->target_residency = 1 * 2;
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state->power_usage = 1;
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state->flags = 0;
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state->flags |= CPUIDLE_FLAG_TIME_VALID;
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state->enter = cpuidle_sleep_enter;
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}
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dev->state_count = i;
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cpuidle_register_device(dev);
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}
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