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