| /* |
| * OMAP4+ Power Management Routines |
| * |
| * Copyright (C) 2010-2013 Texas Instruments, Inc. |
| * Rajendra Nayak <rnayak@ti.com> |
| * Santosh Shilimkar <santosh.shilimkar@ti.com> |
| * |
| * 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 <linux/pm.h> |
| #include <linux/suspend.h> |
| #include <linux/module.h> |
| #include <linux/list.h> |
| #include <linux/err.h> |
| #include <linux/slab.h> |
| #include <asm/system_misc.h> |
| |
| #include "soc.h" |
| #include "common.h" |
| #include "clockdomain.h" |
| #include "powerdomain.h" |
| #include "pm.h" |
| |
| u16 pm44xx_errata; |
| |
| struct power_state { |
| struct powerdomain *pwrdm; |
| u32 next_state; |
| u32 next_logic_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, pwrst->next_logic_state); |
| } |
| |
| /* |
| * 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; |
| } |
| #else |
| #define omap4_pm_suspend NULL |
| #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; |
| pwrst->next_logic_state = PWRDM_POWER_OFF; |
| |
| 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_init_static_deps - Add OMAP4 static dependencies |
| * |
| * Add needed static clockdomain dependencies on OMAP4 devices. |
| * Return: 0 on success or 'err' on failures |
| */ |
| static inline int omap4_init_static_deps(void) |
| { |
| struct clockdomain *emif_clkdm, *mpuss_clkdm, *l3_1_clkdm; |
| struct clockdomain *ducati_clkdm, *l3_2_clkdm; |
| int ret = 0; |
| |
| 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"); |
| return ret; |
| } |
| |
| /* |
| * 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. |
| * The L4 wakeup depedency is added to workaround the OCP sync hardware |
| * BUG with 32K synctimer which lead to incorrect timer value read |
| * from the 32K counter. The BUG applies for GPTIMER1 and WDT2 which |
| * are part of L4 wakeup clockdomain. |
| */ |
| 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)) |
| return -EINVAL; |
| |
| 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"); |
| return -EINVAL; |
| } |
| |
| return ret; |
| } |
| |
| /** |
| * omap4_pm_init_early - Does early initialization necessary for OMAP4+ devices |
| * |
| * Initializes basic stuff for power management functionality. |
| */ |
| int __init omap4_pm_init_early(void) |
| { |
| if (cpu_is_omap446x()) |
| pm44xx_errata |= PM_OMAP4_ROM_SMP_BOOT_ERRATUM_GICD; |
| |
| return 0; |
| } |
| |
| /** |
| * omap4_pm_init - Init routine for OMAP4+ devices |
| * |
| * Initializes all powerdomain and clockdomain target states |
| * and all PRCM settings. |
| * Return: Returns the error code returned by called functions. |
| */ |
| int __init omap4_pm_init(void) |
| { |
| int ret = 0; |
| |
| if (omap_rev() == OMAP4430_REV_ES1_0) { |
| WARN(1, "Power Management not supported on OMAP4430 ES1.0\n"); |
| return -ENODEV; |
| } |
| |
| pr_info("Power Management for TI OMAP4+ devices.\n"); |
| |
| ret = pwrdm_for_each(pwrdms_setup, NULL); |
| if (ret) { |
| pr_err("Failed to setup powerdomains.\n"); |
| goto err2; |
| } |
| |
| if (cpu_is_omap44xx()) { |
| ret = omap4_init_static_deps(); |
| if (ret) |
| 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); |
| |
| omap_common_suspend_init(omap4_pm_suspend); |
| |
| /* Overwrite the default cpu_do_idle() */ |
| arm_pm_idle = omap_default_idle; |
| |
| if (cpu_is_omap44xx()) |
| omap4_idle_init(); |
| |
| err2: |
| return ret; |
| } |