--- /dev/null
+/*
+ * 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/cpuidle.h>
+#include <linux/sched.h>
+#include <mach/pm.h>
+#include <mach/prcm.h>
+#include <mach/powerdomain.h>
+#include <mach/clockdomain.h>
+#include <mach/control.h>
+#include <mach/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 inactive + 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, *per_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 ts_idle.tv_nsec / NSEC_PER_USEC + ts_idle.tv_sec * USEC_PER_SEC;
+}
+
+/**
+ * omap3_enter_idle_bm - Checks for any bus activity
+ * @dev: cpuidle device
+ * @state: The target state to be programmed
+ *
+ * Called from the CPUidle framework for C states with CPUIDLE_FLAG_CHECK_BM
+ * flag set. This function checks for any pending bus activity and then
+ * programs the device to the specified or a lower possible 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 inactive + 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 = 110;
+ omap3_power_states[OMAP3_STATE_C1].wakeup_latency = 162;
+ 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 = 106;
+ omap3_power_states[OMAP3_STATE_C2].wakeup_latency = 180;
+ omap3_power_states[OMAP3_STATE_C2].threshold = 309;
+ 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 |
+ CPUIDLE_FLAG_CHECK_BM;
+
+ /* C3 . MPU CSWR + Core inactive */
+ 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 = 107;
+ omap3_power_states[OMAP3_STATE_C3].wakeup_latency = 410;
+ omap3_power_states[OMAP3_STATE_C3].threshold = 46057;
+ 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 = 0;
+ omap3_power_states[OMAP3_STATE_C4].type = OMAP3_STATE_C4;
+ omap3_power_states[OMAP3_STATE_C4].sleep_latency = 121;
+ omap3_power_states[OMAP3_STATE_C4].wakeup_latency = 3374;
+ omap3_power_states[OMAP3_STATE_C4].threshold = 46057;
+ 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 = 855;
+ omap3_power_states[OMAP3_STATE_C5].wakeup_latency = 1146;
+ omap3_power_states[OMAP3_STATE_C5].threshold = 46057;
+ 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 = 0;
+ omap3_power_states[OMAP3_STATE_C6].type = OMAP3_STATE_C6;
+ omap3_power_states[OMAP3_STATE_C6].sleep_latency = 7580;
+ omap3_power_states[OMAP3_STATE_C6].wakeup_latency = 4134;
+ omap3_power_states[OMAP3_STATE_C6].threshold = 484329;
+ 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 = 7505;
+ omap3_power_states[OMAP3_STATE_C7].wakeup_latency = 15274;
+ omap3_power_states[OMAP3_STATE_C7].threshold = 484329;
+ 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 omap3_idle_init(void)
+{
+ int i, count = 0;
+ struct omap3_processor_cx *cx;
+ struct cpuidle_state *state;
+ struct cpuidle_device *dev;
+
+ omap3_save_scratchpad_contents();
+
+ mpu_pd = pwrdm_lookup("mpu_pwrdm");
+ core_pd = pwrdm_lookup("core_pwrdm");
+ per_pd = pwrdm_lookup("per_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;
+}
+#endif /* CONFIG_CPU_IDLE */
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