@@ -64,7 +64,7 @@ obj-$(CONFIG_ARCH_OMAP2) += sleep24xx.o
obj-$(CONFIG_ARCH_OMAP3) += pm34xx.o sleep34xx.o \
cpuidle34xx.o
obj-$(CONFIG_ARCH_OMAP4) += pm44xx.o sleep44xx.o \
- omap-mpuss-lowpower.o
+ omap-mpuss-lowpower.o cpuidle44xx.o
obj-$(CONFIG_PM_DEBUG) += pm-debug.o
obj-$(CONFIG_OMAP_SMARTREFLEX) += sr_device.o smartreflex.o
obj-$(CONFIG_OMAP_SMARTREFLEX_CLASS3) += smartreflex-class3.o
new file mode 100644
@@ -0,0 +1,198 @@
+/*
+ * OMAP4 CPU idle Routines
+ *
+ * Copyright (C) 2011 Texas Instruments, Inc.
+ * Santosh Shilimkar <santosh.shilimkar@ti.com>
+ * Rajendra Nayak <rnayak@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/sched.h>
+#include <linux/cpuidle.h>
+#include <linux/cpu_pm.h>
+
+#include <asm/proc-fns.h>
+
+#include <mach/omap4-common.h>
+
+#include "pm.h"
+#include "prm.h"
+
+#ifdef CONFIG_CPU_IDLE
+
+/* Machine specific information to be recorded in the C-state driver_data */
+struct omap4_idle_statedata {
+ u32 cpu_state;
+ u32 mpu_logic_state;
+ u32 mpu_state;
+ u8 valid;
+};
+
+static struct cpuidle_params cpuidle_params_table[] = {
+ /* C1 - CPU0 ON + CPU1 ON + MPU ON */
+ {.exit_latency = 2 + 2 , .target_residency = 5, .valid = 1},
+ /* C2- CPU0 OFF + CPU1 OFF + MPU CSWR */
+ {.exit_latency = 328 + 440 , .target_residency = 960, .valid = 1},
+ /* C3 - CPU0 OFF + CPU1 OFF + MPU OSWR */
+ {.exit_latency = 460 + 518 , .target_residency = 1100, .valid = 1},
+};
+
+#define OMAP4_NUM_STATES ARRAY_SIZE(cpuidle_params_table)
+
+struct omap4_idle_statedata omap4_idle_data[OMAP4_NUM_STATES];
+static struct powerdomain *mpu_pd, *cpu0_pd, *cpu1_pd;
+
+/**
+ * omap4_enter_idle - Programs OMAP4 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 low power state selected by the governor.
+ * Returns the amount of time spent in the low power state.
+ */
+static int omap4_enter_idle(struct cpuidle_device *dev,
+ struct cpuidle_state *state)
+{
+ struct omap4_idle_statedata *cx = cpuidle_get_statedata(state);
+ struct timespec ts_preidle, ts_postidle, ts_idle;
+ u32 cpu1_state;
+
+ /* Used to keep track of the total time in idle */
+ getnstimeofday(&ts_preidle);
+
+ local_irq_disable();
+ local_fiq_disable();
+
+ /*
+ * Keep demoting CPU0 C-state till CPU1 hits OFF state.
+ * This is necessary to honour hardware recommondation
+ * of triggeing all the possible low power modes once CPU1 is
+ * out of coherency and in OFF mode.
+ * Update dev->last_state so that governor stats reflects right
+ * data.
+ */
+ cpu1_state = pwrdm_read_pwrst(cpu1_pd);
+ if (cpu1_state != PWRDM_POWER_OFF) {
+ dev->last_state = dev->safe_state;
+ cx = cpuidle_get_statedata(dev->safe_state);
+ }
+
+ /* Call idle CPU PM enter notifier chain */
+ if (cx->cpu_state == PWRDM_POWER_OFF)
+ cpu_pm_enter();
+
+ pwrdm_set_logic_retst(mpu_pd, cx->mpu_logic_state);
+ omap_set_pwrdm_state(mpu_pd, cx->mpu_state);
+
+ /* Call idle CPU cluster PM enter notifier chain */
+ if ((cx->mpu_state == PWRDM_POWER_RET) &&
+ (cx->mpu_logic_state == PWRDM_POWER_OFF))
+ cpu_cluster_pm_enter();
+
+ omap4_enter_lowpower(dev->cpu, cx->cpu_state);
+
+ /* Call idle CPU PM exit notifier chain */
+ if (pwrdm_read_prev_pwrst(cpu0_pd) == PWRDM_POWER_OFF)
+ cpu_pm_exit();
+
+ /* Call idle CPU cluster PM exit notifier chain */
+ if (omap4_mpuss_read_prev_context_state())
+ cpu_cluster_pm_exit();
+
+ 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;
+}
+
+DEFINE_PER_CPU(struct cpuidle_device, omap4_idle_dev);
+
+struct cpuidle_driver omap4_idle_driver = {
+ .name = "omap4_idle",
+ .owner = THIS_MODULE,
+};
+
+/* Fill in the state data from the mach tables and register the driver_data */
+static inline struct omap4_idle_statedata *_fill_cstate(
+ struct cpuidle_device *dev,
+ int idx, const char *descr)
+{
+ struct omap4_idle_statedata *cx = &omap4_idle_data[idx];
+ struct cpuidle_state *state = &dev->states[idx];
+
+ state->exit_latency = cpuidle_params_table[idx].exit_latency;
+ state->target_residency = cpuidle_params_table[idx].target_residency;
+ state->flags = CPUIDLE_FLAG_TIME_VALID;
+ state->enter = omap4_enter_idle;
+ cx->valid = cpuidle_params_table[idx].valid;
+ sprintf(state->name, "C%d", idx + 1);
+ strncpy(state->desc, descr, CPUIDLE_DESC_LEN);
+ cpuidle_set_statedata(state, cx);
+
+ return cx;
+}
+
+/**
+ * omap4_idle_init - Init routine for OMAP4 idle
+ *
+ * Registers the OMAP4 specific cpuidle driver to the cpuidle
+ * framework with the valid set of states.
+ */
+int __init omap4_idle_init(void)
+{
+ struct omap4_idle_statedata *cx;
+ struct cpuidle_device *dev;
+ unsigned int cpu_id = 0;
+
+ mpu_pd = pwrdm_lookup("mpu_pwrdm");
+ cpu0_pd = pwrdm_lookup("cpu0_pwrdm");
+ cpu1_pd = pwrdm_lookup("cpu1_pwrdm");
+ if ((!mpu_pd) || (!cpu0_pd) || (!cpu1_pd))
+ return -ENODEV;
+
+ cpuidle_register_driver(&omap4_idle_driver);
+
+ dev = &per_cpu(omap4_idle_dev, cpu_id);
+ dev->cpu = cpu_id;
+
+ /* C1 - CPU0 ON + CPU1 ON + MPU ON */
+ cx = _fill_cstate(dev, 0, "MPUSS ON");
+ dev->safe_state = &dev->states[0];
+ cx->valid = 1; /* C1 is always valid */
+ cx->cpu_state = PWRDM_POWER_ON;
+ cx->mpu_state = PWRDM_POWER_ON;
+ cx->mpu_logic_state = PWRDM_POWER_RET;
+
+ /* C2 - CPU0 OFF + CPU1 OFF + MPU CSWR */
+ cx = _fill_cstate(dev, 1, "MPUSS CSWR");
+ cx->cpu_state = PWRDM_POWER_OFF;
+ cx->mpu_state = PWRDM_POWER_RET;
+ cx->mpu_logic_state = PWRDM_POWER_RET;
+
+ /* C3 - CPU0 OFF + CPU1 OFF + MPU OSWR */
+ cx = _fill_cstate(dev, 2, "MPUSS OSWR");
+ cx->cpu_state = PWRDM_POWER_OFF;
+ cx->mpu_state = PWRDM_POWER_RET;
+ cx->mpu_logic_state = PWRDM_POWER_OFF;
+
+ dev->state_count = OMAP4_NUM_STATES;
+ if (cpuidle_register_device(dev)) {
+ pr_err("%s: CPUidle register device failed\n", __func__);
+ return -EIO;
+ }
+
+ return 0;
+}
+#else
+int __init omap4_idle_init(void)
+{
+ return 0;
+}
+#endif /* CONFIG_CPU_IDLE */
@@ -21,6 +21,7 @@ extern void omap_sram_idle(void);
extern int omap3_can_sleep(void);
extern int omap_set_pwrdm_state(struct powerdomain *pwrdm, u32 state);
extern int omap3_idle_init(void);
+extern int omap4_idle_init(void);
#if defined(CONFIG_PM_OPP)
extern int omap3_opp_init(void);
@@ -258,6 +258,8 @@ static int __init omap4_pm_init(void)
/* Overwrite the default arch_idle() */
pm_idle = omap_default_idle;
+ omap4_idle_init();
+
err2:
return ret;
}