/* * linux/arch/arm/mach-omap2/cpuidle34xx.c * * OMAP3 CPU IDLE Routines * * Copyright (C) 2008 Texas Instruments, Inc. * Rajendra Nayak * * Copyright (C) 2007 Texas Instruments, Inc. * Karthik Dasu * * Copyright (C) 2006 Nokia Corporation * Tony Lindgren * * Copyright (C) 2005 Texas Instruments, Inc. * Richard Woodruff * * Based on pm.c for omap2 * * 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 #ifdef CONFIG_CPU_IDLE #define OMAP3_MAX_STATES 7 #define OMAP3_STATE_C1 1 /* C1 - MPU WFI + Core active */ #define OMAP3_STATE_C2 2 /* C2 - MPU CSWR + Core active */ #define OMAP3_STATE_C3 3 /* C3 - MPU OFF + Core active */ #define OMAP3_STATE_C4 4 /* C4 - MPU RET + Core RET */ #define OMAP3_STATE_C5 5 /* C5 - MPU OFF + Core RET */ #define OMAP3_STATE_C6 6 /* C6 - MPU OFF + Core OFF */ struct omap3_processor_cx { u8 valid; u8 type; u32 sleep_latency; u32 wakeup_latency; u32 mpu_state; u32 core_state; u32 threshold; u32 flags; }; struct omap3_processor_cx omap3_power_states[OMAP3_MAX_STATES]; struct omap3_processor_cx current_cx_state; struct powerdomain *mpu_pd; static int omap3_idle_bm_check(void) { return 0; } /** * omap3_enter_idle - Programs OMAP3 to enter the specified state * @dev: cpuidle device * @state: The target state to be programmed * * Called from the CPUidle framework to program the device to the * specified target state selected by the governor. */ static int omap3_enter_idle(struct cpuidle_device *dev, struct cpuidle_state *state) { struct omap3_processor_cx *cx = cpuidle_get_statedata(state); struct timespec ts_preidle, ts_postidle, ts_idle; current_cx_state = *cx; /* Used to keep track of the total time in idle */ getnstimeofday(&ts_preidle); local_irq_disable(); local_fiq_disable(); /* Program MPU to target state */ if (cx->mpu_state < PWRDM_POWER_ON) pwrdm_set_next_pwrst(mpu_pd, cx->mpu_state); /* Execute ARM wfi */ omap_sram_idle(); /* Program MPU to ON */ if (cx->mpu_state < PWRDM_POWER_ON) pwrdm_set_next_pwrst(mpu_pd, PWRDM_POWER_ON); getnstimeofday(&ts_postidle); ts_idle = timespec_sub(ts_postidle, ts_preidle); local_irq_enable(); local_fiq_enable(); return timespec_to_ns(&ts_idle); } /** * omap3_enter_idle_bm - Checks for any bus activity * @dev: cpuidle device * @state: The target state to be programmed * * Used for C states with CPUIDLE_FLAG_CHECK_BM flag set. This * function checks for any pending activity and then programs the * device to the specified or a safer state. */ static int omap3_enter_idle_bm(struct cpuidle_device *dev, struct cpuidle_state *state) { if ((state->flags & CPUIDLE_FLAG_CHECK_BM) && omap3_idle_bm_check()) { if (dev->safe_state) return dev->safe_state->enter(dev, dev->safe_state); } return omap3_enter_idle(dev, state); } DEFINE_PER_CPU(struct cpuidle_device, omap3_idle_dev); /* omap3_init_power_states - Initialises the OMAP3 specific C states. * * Below is the desciption of each C state. * C1 . MPU WFI + Core active * C2 . MPU CSWR + Core active * C3 . MPU OFF + Core active * C4 . MPU CSWR + Core CSWR * C5 . MPU OFF + Core CSWR * C6 . MPU OFF + Core OFF */ void omap_init_power_states(void) { /* C1 . MPU WFI + Core active */ omap3_power_states[OMAP3_STATE_C1].valid = 1; omap3_power_states[OMAP3_STATE_C1].type = OMAP3_STATE_C1; omap3_power_states[OMAP3_STATE_C1].sleep_latency = 10; omap3_power_states[OMAP3_STATE_C1].wakeup_latency = 10; omap3_power_states[OMAP3_STATE_C1].threshold = 30; omap3_power_states[OMAP3_STATE_C1].mpu_state = PWRDM_POWER_ON; omap3_power_states[OMAP3_STATE_C1].core_state = PWRDM_POWER_ON; omap3_power_states[OMAP3_STATE_C1].flags = CPUIDLE_FLAG_TIME_VALID; /* C2 . MPU CSWR + Core active */ omap3_power_states[OMAP3_STATE_C2].valid = 1; omap3_power_states[OMAP3_STATE_C2].type = OMAP3_STATE_C2; omap3_power_states[OMAP3_STATE_C2].sleep_latency = 50; omap3_power_states[OMAP3_STATE_C2].wakeup_latency = 50; omap3_power_states[OMAP3_STATE_C2].threshold = 300; omap3_power_states[OMAP3_STATE_C2].mpu_state = PWRDM_POWER_RET; omap3_power_states[OMAP3_STATE_C2].core_state = PWRDM_POWER_ON; omap3_power_states[OMAP3_STATE_C2].flags = CPUIDLE_FLAG_TIME_VALID; /* C3 . MPU OFF + Core active */ omap3_power_states[OMAP3_STATE_C3].valid = 0; omap3_power_states[OMAP3_STATE_C3].type = OMAP3_STATE_C3; omap3_power_states[OMAP3_STATE_C3].sleep_latency = 1500; omap3_power_states[OMAP3_STATE_C3].wakeup_latency = 1800; omap3_power_states[OMAP3_STATE_C3].threshold = 4000; omap3_power_states[OMAP3_STATE_C3].mpu_state = PWRDM_POWER_OFF; omap3_power_states[OMAP3_STATE_C3].core_state = PWRDM_POWER_ON; omap3_power_states[OMAP3_STATE_C3].flags = CPUIDLE_FLAG_TIME_VALID; /* C4 . MPU CSWR + Core CSWR*/ omap3_power_states[OMAP3_STATE_C4].valid = 0; omap3_power_states[OMAP3_STATE_C4].type = OMAP3_STATE_C4; omap3_power_states[OMAP3_STATE_C4].sleep_latency = 2500; omap3_power_states[OMAP3_STATE_C4].wakeup_latency = 7500; omap3_power_states[OMAP3_STATE_C4].threshold = 12000; omap3_power_states[OMAP3_STATE_C4].mpu_state = PWRDM_POWER_RET; omap3_power_states[OMAP3_STATE_C4].core_state = PWRDM_POWER_RET; omap3_power_states[OMAP3_STATE_C4].flags = CPUIDLE_FLAG_TIME_VALID | CPUIDLE_FLAG_CHECK_BM; /* C5 . MPU OFF + Core CSWR */ omap3_power_states[OMAP3_STATE_C5].valid = 0; omap3_power_states[OMAP3_STATE_C5].type = OMAP3_STATE_C5; omap3_power_states[OMAP3_STATE_C5].sleep_latency = 3000; omap3_power_states[OMAP3_STATE_C5].wakeup_latency = 8500; omap3_power_states[OMAP3_STATE_C5].threshold = 15000; omap3_power_states[OMAP3_STATE_C5].mpu_state = PWRDM_POWER_OFF; omap3_power_states[OMAP3_STATE_C5].core_state = PWRDM_POWER_RET; omap3_power_states[OMAP3_STATE_C5].flags = CPUIDLE_FLAG_TIME_VALID | CPUIDLE_FLAG_CHECK_BM; /* C6 . MPU OFF + Core OFF */ omap3_power_states[OMAP3_STATE_C6].valid = 0; omap3_power_states[OMAP3_STATE_C6].type = OMAP3_STATE_C6; omap3_power_states[OMAP3_STATE_C6].sleep_latency = 10000; omap3_power_states[OMAP3_STATE_C6].wakeup_latency = 30000; omap3_power_states[OMAP3_STATE_C6].threshold = 300000; omap3_power_states[OMAP3_STATE_C6].mpu_state = PWRDM_POWER_OFF; omap3_power_states[OMAP3_STATE_C6].core_state = PWRDM_POWER_OFF; omap3_power_states[OMAP3_STATE_C6].flags = CPUIDLE_FLAG_TIME_VALID | CPUIDLE_FLAG_CHECK_BM; } struct cpuidle_driver omap3_idle_driver = { .name = "omap3_idle", .owner = THIS_MODULE, }; /** * omap3_idle_init - Init routine for OMAP3 idle * * Registers the OMAP3 specific cpuidle driver with the cpuidle * framework with the valid set of states. */ int omap3_idle_init(void) { int i, count = 0; struct omap3_processor_cx *cx; struct cpuidle_state *state; struct cpuidle_device *dev; mpu_pd = pwrdm_lookup("mpu_pwrdm"); omap_init_power_states(); cpuidle_register_driver(&omap3_idle_driver); dev = &per_cpu(omap3_idle_dev, smp_processor_id()); for (i = 1; i < OMAP3_MAX_STATES; i++) { cx = &omap3_power_states[i]; state = &dev->states[count]; if (!cx->valid) continue; cpuidle_set_statedata(state, cx); state->exit_latency = cx->sleep_latency + cx->wakeup_latency; state->target_residency = cx->threshold; state->flags = cx->flags; state->enter = (state->flags & CPUIDLE_FLAG_CHECK_BM) ? omap3_enter_idle_bm : omap3_enter_idle; if (cx->type == OMAP3_STATE_C1) dev->safe_state = state; sprintf(state->name, "C%d", count+1); count++; } if (!count) return -EINVAL; dev->state_count = count; if (cpuidle_register_device(dev)) { printk(KERN_ERR "%s: CPUidle register device failed\n", __func__); return -EIO; } return 0; } device_initcall(omap3_idle_init); #endif /* CONFIG_CPU_IDLE */