diff options
Diffstat (limited to 'arch/arm/mach-omap2/cpuidle34xx.c')
| -rw-r--r-- | arch/arm/mach-omap2/cpuidle34xx.c | 318 |
1 files changed, 318 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/cpuidle34xx.c b/arch/arm/mach-omap2/cpuidle34xx.c new file mode 100644 index 000000000000..a26d6a08ae3f --- /dev/null +++ b/arch/arm/mach-omap2/cpuidle34xx.c @@ -0,0 +1,318 @@ +/* + * linux/arch/arm/mach-omap2/cpuidle34xx.c + * + * OMAP3 CPU IDLE Routines + * + * Copyright (C) 2008 Texas Instruments, Inc. + * Rajendra Nayak <rnayak@ti.com> + * + * Copyright (C) 2007 Texas Instruments, Inc. + * Karthik Dasu <karthik-dp@ti.com> + * + * Copyright (C) 2006 Nokia Corporation + * Tony Lindgren <tony@atomide.com> + * + * Copyright (C) 2005 Texas Instruments, Inc. + * Richard Woodruff <r-woodruff2@ti.com> + * + * 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 <linux/sched.h> +#include <linux/cpuidle.h> + +#include <plat/prcm.h> +#include <plat/irqs.h> +#include <plat/powerdomain.h> +#include <plat/clockdomain.h> +#include <plat/control.h> +#include <plat/serial.h> + +#include "pm.h" + +#ifdef CONFIG_CPU_IDLE + +#define OMAP3_MAX_STATES 7 +#define OMAP3_STATE_C1 0 /* C1 - MPU WFI + Core active */ +#define OMAP3_STATE_C2 1 /* C2 - MPU WFI + Core inactive */ +#define OMAP3_STATE_C3 2 /* C3 - MPU CSWR + Core inactive */ +#define OMAP3_STATE_C4 3 /* C4 - MPU OFF + Core iactive */ +#define OMAP3_STATE_C5 4 /* C5 - MPU RET + Core RET */ +#define OMAP3_STATE_C6 5 /* C6 - MPU OFF + Core RET */ +#define OMAP3_STATE_C7 6 /* C7 - 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, *core_pd; + +static int omap3_idle_bm_check(void) +{ + if (!omap3_can_sleep()) + return 1; + return 0; +} + +static int _cpuidle_allow_idle(struct powerdomain *pwrdm, + struct clockdomain *clkdm) +{ + omap2_clkdm_allow_idle(clkdm); + return 0; +} + +static int _cpuidle_deny_idle(struct powerdomain *pwrdm, + struct clockdomain *clkdm) +{ + omap2_clkdm_deny_idle(clkdm); + 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; + u32 mpu_state = cx->mpu_state, core_state = cx->core_state; + + current_cx_state = *cx; + + /* Used to keep track of the total time in idle */ + getnstimeofday(&ts_preidle); + + local_irq_disable(); + local_fiq_disable(); + + if (!enable_off_mode) { + if (mpu_state < PWRDM_POWER_RET) + mpu_state = PWRDM_POWER_RET; + if (core_state < PWRDM_POWER_RET) + core_state = PWRDM_POWER_RET; + } + + pwrdm_set_next_pwrst(mpu_pd, mpu_state); + pwrdm_set_next_pwrst(core_pd, core_state); + + if (omap_irq_pending() || need_resched()) + goto return_sleep_time; + + if (cx->type == OMAP3_STATE_C1) { + pwrdm_for_each_clkdm(mpu_pd, _cpuidle_deny_idle); + pwrdm_for_each_clkdm(core_pd, _cpuidle_deny_idle); + } + + /* Execute ARM wfi */ + omap_sram_idle(); + + if (cx->type == OMAP3_STATE_C1) { + pwrdm_for_each_clkdm(mpu_pd, _cpuidle_allow_idle); + pwrdm_for_each_clkdm(core_pd, _cpuidle_allow_idle); + } + +return_sleep_time: + getnstimeofday(&ts_postidle); + ts_idle = timespec_sub(ts_postidle, ts_preidle); + + local_irq_enable(); + local_fiq_enable(); + + return (u32)timespec_to_ns(&ts_idle)/1000; +} + +/** + * 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) +{ + struct cpuidle_state *new_state = state; + + if ((state->flags & CPUIDLE_FLAG_CHECK_BM) && omap3_idle_bm_check()) { + BUG_ON(!dev->safe_state); + new_state = dev->safe_state; + } + + dev->last_state = new_state; + return omap3_enter_idle(dev, new_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 WFI + Core inactive + * C3 . MPU CSWR + Core inactive + * C4 . MPU OFF + Core inactive + * C5 . MPU CSWR + Core CSWR + * C6 . MPU OFF + Core CSWR + * C7 . 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 = 2; + omap3_power_states[OMAP3_STATE_C1].wakeup_latency = 2; + omap3_power_states[OMAP3_STATE_C1].threshold = 5; + 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 WFI + Core inactive */ + 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 = 10; + omap3_power_states[OMAP3_STATE_C2].wakeup_latency = 10; + omap3_power_states[OMAP3_STATE_C2].threshold = 30; + omap3_power_states[OMAP3_STATE_C2].mpu_state = PWRDM_POWER_ON; + omap3_power_states[OMAP3_STATE_C2].core_state = PWRDM_POWER_ON; + omap3_power_states[OMAP3_STATE_C2].flags = CPUIDLE_FLAG_TIME_VALID; + + /* C3 . MPU CSWR + Core inactive */ + omap3_power_states[OMAP3_STATE_C3].valid = 1; + omap3_power_states[OMAP3_STATE_C3].type = OMAP3_STATE_C3; + omap3_power_states[OMAP3_STATE_C3].sleep_latency = 50; + omap3_power_states[OMAP3_STATE_C3].wakeup_latency = 50; + omap3_power_states[OMAP3_STATE_C3].threshold = 300; + omap3_power_states[OMAP3_STATE_C3].mpu_state = PWRDM_POWER_RET; + omap3_power_states[OMAP3_STATE_C3].core_state = PWRDM_POWER_ON; + omap3_power_states[OMAP3_STATE_C3].flags = CPUIDLE_FLAG_TIME_VALID | + CPUIDLE_FLAG_CHECK_BM; + + /* C4 . MPU OFF + Core inactive */ + omap3_power_states[OMAP3_STATE_C4].valid = 1; + omap3_power_states[OMAP3_STATE_C4].type = OMAP3_STATE_C4; + omap3_power_states[OMAP3_STATE_C4].sleep_latency = 1500; + omap3_power_states[OMAP3_STATE_C4].wakeup_latency = 1800; + omap3_power_states[OMAP3_STATE_C4].threshold = 4000; + omap3_power_states[OMAP3_STATE_C4].mpu_state = PWRDM_POWER_OFF; + omap3_power_states[OMAP3_STATE_C4].core_state = PWRDM_POWER_ON; + omap3_power_states[OMAP3_STATE_C4].flags = CPUIDLE_FLAG_TIME_VALID | + CPUIDLE_FLAG_CHECK_BM; + + /* C5 . MPU CSWR + Core CSWR*/ + omap3_power_states[OMAP3_STATE_C5].valid = 1; + omap3_power_states[OMAP3_STATE_C5].type = OMAP3_STATE_C5; + omap3_power_states[OMAP3_STATE_C5].sleep_latency = 2500; + omap3_power_states[OMAP3_STATE_C5].wakeup_latency = 7500; + omap3_power_states[OMAP3_STATE_C5].threshold = 12000; + omap3_power_states[OMAP3_STATE_C5].mpu_state = PWRDM_POWER_RET; + 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 CSWR */ + omap3_power_states[OMAP3_STATE_C6].valid = 1; + omap3_power_states[OMAP3_STATE_C6].type = OMAP3_STATE_C6; + omap3_power_states[OMAP3_STATE_C6].sleep_latency = 3000; + omap3_power_states[OMAP3_STATE_C6].wakeup_latency = 8500; + omap3_power_states[OMAP3_STATE_C6].threshold = 15000; + omap3_power_states[OMAP3_STATE_C6].mpu_state = PWRDM_POWER_OFF; + omap3_power_states[OMAP3_STATE_C6].core_state = PWRDM_POWER_RET; + omap3_power_states[OMAP3_STATE_C6].flags = CPUIDLE_FLAG_TIME_VALID | + CPUIDLE_FLAG_CHECK_BM; + + /* C7 . MPU OFF + Core OFF */ + omap3_power_states[OMAP3_STATE_C7].valid = 1; + omap3_power_states[OMAP3_STATE_C7].type = OMAP3_STATE_C7; + omap3_power_states[OMAP3_STATE_C7].sleep_latency = 10000; + omap3_power_states[OMAP3_STATE_C7].wakeup_latency = 30000; + omap3_power_states[OMAP3_STATE_C7].threshold = 300000; + omap3_power_states[OMAP3_STATE_C7].mpu_state = PWRDM_POWER_OFF; + omap3_power_states[OMAP3_STATE_C7].core_state = PWRDM_POWER_OFF; + omap3_power_states[OMAP3_STATE_C7].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 __init 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"); + core_pd = pwrdm_lookup("core_pwrdm"); + + omap_init_power_states(); + cpuidle_register_driver(&omap3_idle_driver); + + dev = &per_cpu(omap3_idle_dev, smp_processor_id()); + + for (i = OMAP3_STATE_C1; 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; +} +#else +int __init omap3_idle_init(void) +{ + return 0; +} +#endif /* CONFIG_CPU_IDLE */ |