2010-08-02 04:18:18 -06:00
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/*
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* OMAP4 Power Management Routines
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*
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2010-06-16 10:49:49 -06:00
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* Copyright (C) 2010-2011 Texas Instruments, Inc.
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2010-08-02 04:18:18 -06:00
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* Rajendra Nayak <rnayak@ti.com>
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2010-06-16 10:49:49 -06:00
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* Santosh Shilimkar <santosh.shilimkar@ti.com>
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2010-08-02 04:18:18 -06:00
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/pm.h>
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#include <linux/suspend.h>
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#include <linux/module.h>
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#include <linux/list.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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2012-03-28 11:30:01 -06:00
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#include <asm/system_misc.h>
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2010-08-02 04:18:18 -06:00
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2012-10-05 14:25:59 -06:00
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#include "soc.h"
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2011-11-10 14:45:17 -07:00
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#include "common.h"
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2011-01-05 09:33:17 -07:00
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#include "clockdomain.h"
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2010-12-21 21:05:16 -07:00
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#include "powerdomain.h"
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2010-06-16 10:49:49 -06:00
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#include "pm.h"
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2010-08-02 04:18:18 -06:00
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struct power_state {
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struct powerdomain *pwrdm;
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u32 next_state;
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#ifdef CONFIG_SUSPEND
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u32 saved_state;
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2011-06-06 03:03:29 -06:00
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u32 saved_logic_state;
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2010-08-02 04:18:18 -06:00
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#endif
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struct list_head node;
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};
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static LIST_HEAD(pwrst_list);
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#ifdef CONFIG_SUSPEND
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static int omap4_pm_suspend(void)
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{
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2010-06-16 10:49:49 -06:00
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struct power_state *pwrst;
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int state, ret = 0;
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u32 cpu_id = smp_processor_id();
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/* Save current powerdomain state */
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list_for_each_entry(pwrst, &pwrst_list, node) {
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pwrst->saved_state = pwrdm_read_next_pwrst(pwrst->pwrdm);
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2011-06-06 03:03:29 -06:00
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pwrst->saved_logic_state = pwrdm_read_logic_retst(pwrst->pwrdm);
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2010-06-16 10:49:49 -06:00
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}
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/* Set targeted power domain states by suspend */
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list_for_each_entry(pwrst, &pwrst_list, node) {
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omap_set_pwrdm_state(pwrst->pwrdm, pwrst->next_state);
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2011-06-06 03:03:29 -06:00
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pwrdm_set_logic_retst(pwrst->pwrdm, PWRDM_POWER_OFF);
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2010-06-16 10:49:49 -06:00
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}
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/*
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* For MPUSS to hit power domain retention(CSWR or OSWR),
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* CPU0 and CPU1 power domains need to be in OFF or DORMANT state,
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* since CPU power domain CSWR is not supported by hardware
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* Only master CPU follows suspend path. All other CPUs follow
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* CPU hotplug path in system wide suspend. On OMAP4, CPU power
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* domain CSWR is not supported by hardware.
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* More details can be found in OMAP4430 TRM section 4.3.4.2.
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*/
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omap4_enter_lowpower(cpu_id, PWRDM_POWER_OFF);
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/* Restore next powerdomain state */
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list_for_each_entry(pwrst, &pwrst_list, node) {
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state = pwrdm_read_prev_pwrst(pwrst->pwrdm);
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if (state > pwrst->next_state) {
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2012-07-26 00:54:26 -06:00
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pr_info("Powerdomain (%s) didn't enter target state %d\n",
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pwrst->pwrdm->name, pwrst->next_state);
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2010-06-16 10:49:49 -06:00
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ret = -1;
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}
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omap_set_pwrdm_state(pwrst->pwrdm, pwrst->saved_state);
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2011-06-06 03:03:29 -06:00
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pwrdm_set_logic_retst(pwrst->pwrdm, pwrst->saved_logic_state);
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2010-06-16 10:49:49 -06:00
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}
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2013-02-04 05:24:43 -07:00
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if (ret) {
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2010-06-16 10:49:49 -06:00
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pr_crit("Could not enter target state in pm_suspend\n");
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2013-02-04 05:24:43 -07:00
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/*
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* OMAP4 chip PM currently works only with certain (newer)
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* versions of bootloaders. This is due to missing code in the
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* kernel to properly reset and initialize some devices.
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* Warn the user about the bootloader version being one of the
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* possible causes.
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* http://www.spinics.net/lists/arm-kernel/msg218641.html
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*/
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pr_warn("A possible cause could be an old bootloader - try u-boot >= v2012.07\n");
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} else {
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2010-06-16 10:49:49 -06:00
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pr_info("Successfully put all powerdomains to target state\n");
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2013-02-04 05:24:43 -07:00
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}
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2010-06-16 10:49:49 -06:00
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2010-08-02 04:18:18 -06:00
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return 0;
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}
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#endif /* CONFIG_SUSPEND */
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static int __init pwrdms_setup(struct powerdomain *pwrdm, void *unused)
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{
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struct power_state *pwrst;
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if (!pwrdm->pwrsts)
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return 0;
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2010-06-16 10:49:49 -06:00
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/*
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* Skip CPU0 and CPU1 power domains. CPU1 is programmed
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* through hotplug path and CPU0 explicitly programmed
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* further down in the code path
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*/
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if (!strncmp(pwrdm->name, "cpu", 3))
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return 0;
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2010-08-02 04:18:18 -06:00
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pwrst = kmalloc(sizeof(struct power_state), GFP_ATOMIC);
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if (!pwrst)
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return -ENOMEM;
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2010-06-16 10:49:49 -06:00
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2010-08-02 04:18:18 -06:00
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pwrst->pwrdm = pwrdm;
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2010-06-16 10:49:49 -06:00
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pwrst->next_state = PWRDM_POWER_RET;
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2010-08-02 04:18:18 -06:00
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list_add(&pwrst->node, &pwrst_list);
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2010-06-16 10:49:49 -06:00
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return omap_set_pwrdm_state(pwrst->pwrdm, pwrst->next_state);
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2010-08-02 04:18:18 -06:00
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}
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2011-07-18 00:55:10 -06:00
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/**
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* omap_default_idle - OMAP4 default ilde routine.'
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*
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* Implements OMAP4 memory, IO ordering requirements which can't be addressed
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2013-03-29 14:35:01 -06:00
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* with default cpu_do_idle() hook. Used by all CPUs with !CONFIG_CPU_IDLE and
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* by secondary CPU with CONFIG_CPU_IDLE.
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2011-07-18 00:55:10 -06:00
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*/
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static void omap_default_idle(void)
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{
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omap_do_wfi();
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}
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2010-08-02 04:18:18 -06:00
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/**
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* omap4_pm_init - Init routine for OMAP4 PM
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*
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* Initializes all powerdomain and clockdomain target states
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* and all PRCM settings.
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*/
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2012-04-26 02:06:50 -06:00
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int __init omap4_pm_init(void)
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2010-08-02 04:18:18 -06:00
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{
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int ret;
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2013-02-16 05:25:08 -07:00
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struct clockdomain *emif_clkdm, *mpuss_clkdm, *l3_1_clkdm;
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2013-02-16 05:34:54 -07:00
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struct clockdomain *ducati_clkdm, *l3_2_clkdm;
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2010-08-02 04:18:18 -06:00
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2011-03-11 03:43:09 -07:00
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if (omap_rev() == OMAP4430_REV_ES1_0) {
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WARN(1, "Power Management not supported on OMAP4430 ES1.0\n");
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return -ENODEV;
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}
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2010-08-02 04:18:18 -06:00
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pr_err("Power Management for TI OMAP4.\n");
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2013-02-04 05:24:43 -07:00
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/*
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* OMAP4 chip PM currently works only with certain (newer)
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* versions of bootloaders. This is due to missing code in the
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* kernel to properly reset and initialize some devices.
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* http://www.spinics.net/lists/arm-kernel/msg218641.html
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*/
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pr_warn("OMAP4 PM: u-boot >= v2012.07 is required for full PM support\n");
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2010-08-02 04:18:18 -06:00
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ret = pwrdm_for_each(pwrdms_setup, NULL);
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if (ret) {
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pr_err("Failed to setup powerdomains\n");
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goto err2;
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}
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2011-03-08 05:54:30 -07:00
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/*
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* The dynamic dependency between MPUSS -> MEMIF and
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* MPUSS -> L4_PER/L3_* and DUCATI -> L3_* doesn't work as
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* expected. The hardware recommendation is to enable static
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* dependencies for these to avoid system lock ups or random crashes.
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*/
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mpuss_clkdm = clkdm_lookup("mpuss_clkdm");
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emif_clkdm = clkdm_lookup("l3_emif_clkdm");
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l3_1_clkdm = clkdm_lookup("l3_1_clkdm");
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l3_2_clkdm = clkdm_lookup("l3_2_clkdm");
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ducati_clkdm = clkdm_lookup("ducati_clkdm");
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2013-02-16 05:25:08 -07:00
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if ((!mpuss_clkdm) || (!emif_clkdm) || (!l3_1_clkdm) ||
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2013-02-16 05:34:54 -07:00
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(!l3_2_clkdm) || (!ducati_clkdm))
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2011-03-08 05:54:30 -07:00
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goto err2;
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ret = clkdm_add_wkdep(mpuss_clkdm, emif_clkdm);
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ret |= clkdm_add_wkdep(mpuss_clkdm, l3_1_clkdm);
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ret |= clkdm_add_wkdep(mpuss_clkdm, l3_2_clkdm);
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ret |= clkdm_add_wkdep(ducati_clkdm, l3_1_clkdm);
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ret |= clkdm_add_wkdep(ducati_clkdm, l3_2_clkdm);
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if (ret) {
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2012-07-26 00:54:26 -06:00
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pr_err("Failed to add MPUSS -> L3/EMIF/L4PER, DUCATI -> L3 wakeup dependency\n");
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2011-03-08 05:54:30 -07:00
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goto err2;
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}
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2010-06-16 10:49:48 -06:00
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ret = omap4_mpuss_init();
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if (ret) {
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pr_err("Failed to initialise OMAP4 MPUSS\n");
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goto err2;
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}
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2012-02-02 02:38:50 -07:00
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(void) clkdm_for_each(omap_pm_clkdms_setup, NULL);
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2011-01-05 09:33:17 -07:00
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2010-08-02 04:18:18 -06:00
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#ifdef CONFIG_SUSPEND
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2012-02-02 02:30:50 -07:00
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omap_pm_suspend = omap4_pm_suspend;
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#endif
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2010-08-02 04:18:18 -06:00
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2011-12-19 01:03:58 -07:00
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/* Overwrite the default cpu_do_idle() */
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2012-01-04 14:27:48 -07:00
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arm_pm_idle = omap_default_idle;
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2011-07-18 00:55:10 -06:00
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2011-08-16 06:01:40 -06:00
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omap4_idle_init();
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2010-08-02 04:18:18 -06:00
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err2:
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return ret;
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}
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