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-rw-r--r--recipes/linux/linux-omap2-git/beagleboard/0001-omap3-cpuidle.patch450
1 files changed, 450 insertions, 0 deletions
diff --git a/recipes/linux/linux-omap2-git/beagleboard/0001-omap3-cpuidle.patch b/recipes/linux/linux-omap2-git/beagleboard/0001-omap3-cpuidle.patch
new file mode 100644
index 0000000000..cdc9447b4c
--- /dev/null
+++ b/recipes/linux/linux-omap2-git/beagleboard/0001-omap3-cpuidle.patch
@@ -0,0 +1,450 @@
+From: "Rajendra Nayak" <rnayak@ti.com>
+To: <linux-omap@vger.kernel.org>
+Subject: [PATCH 01/02] OMAP3 CPUidle driver
+Date: Tue, 10 Jun 2008 12:39:00 +0530
+
+This patch adds the OMAP3 cpuidle driver. Irq enable/disable is done in the core cpuidle driver
+before it queries the governor for the next state.
+
+Signed-off-by: Rajendra Nayak <rnayak@ti.com>
+
+---
+ arch/arm/mach-omap2/Makefile | 2
+ arch/arm/mach-omap2/cpuidle34xx.c | 293 ++++++++++++++++++++++++++++++++++++++
+ arch/arm/mach-omap2/cpuidle34xx.h | 51 ++++++
+ arch/arm/mach-omap2/pm34xx.c | 5
+ drivers/cpuidle/cpuidle.c | 10 +
+ 5 files changed, 359 insertions(+), 2 deletions(-)
+
+Index: linux-omap-2.6/arch/arm/mach-omap2/Makefile
+===================================================================
+--- linux-omap-2.6.orig/arch/arm/mach-omap2/Makefile 2008-06-09 20:15:33.855303920 +0530
++++ linux-omap-2.6/arch/arm/mach-omap2/Makefile 2008-06-09 20:15:39.569121361 +0530
+@@ -20,7 +20,7 @@ obj-y += pm.o
+ obj-$(CONFIG_ARCH_OMAP2) += pm24xx.o
+ obj-$(CONFIG_ARCH_OMAP2420) += sleep242x.o
+ obj-$(CONFIG_ARCH_OMAP2430) += sleep243x.o
+-obj-$(CONFIG_ARCH_OMAP3) += pm34xx.o sleep34xx.o
++obj-$(CONFIG_ARCH_OMAP3) += pm34xx.o sleep34xx.o cpuidle34xx.o
+ obj-$(CONFIG_PM_DEBUG) += pm-debug.o
+ endif
+
+Index: linux-omap-2.6/arch/arm/mach-omap2/cpuidle34xx.c
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-omap-2.6/arch/arm/mach-omap2/cpuidle34xx.c 2008-06-10 11:41:27.644820323 +0530
+@@ -0,0 +1,293 @@
++/*
++ * linux/arch/arm/mach-omap2/cpuidle34xx.c
++ *
++ * OMAP3 CPU IDLE Routines
++ *
++ * Copyright (C) 2007-2008 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>
++ *
++ * 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 <asm/arch/pm.h>
++#include <asm/arch/prcm.h>
++#include <asm/arch/powerdomain.h>
++#include <asm/arch/clockdomain.h>
++#include <asm/arch/irqs.h>
++#include "cpuidle34xx.h"
++
++#ifdef CONFIG_CPU_IDLE
++
++struct omap3_processor_cx omap3_power_states[OMAP3_MAX_STATES];
++struct omap3_processor_cx current_cx_state;
++
++static int omap3_idle_bm_check(void)
++{
++ /* Check for omap3_fclks_active() here once available */
++ return 0;
++}
++
++/* omap3_enter_idle - Programs OMAP3 to enter the specified state.
++ * returns the total time during which the system was idle.
++ */
++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;
++ struct powerdomain *mpu_pd, *core_pd, *per_pd, *neon_pd;
++ int neon_pwrst;
++
++ current_cx_state = *cx;
++
++ if (cx->type == OMAP3_STATE_C0) {
++ /* Do nothing for C0, not even a wfi */
++ return 0;
++ }
++
++ /* Used to keep track of the total time in idle */
++ getnstimeofday(&ts_preidle);
++
++ mpu_pd = pwrdm_lookup("mpu_pwrdm");
++ core_pd = pwrdm_lookup("core_pwrdm");
++ per_pd = pwrdm_lookup("per_pwrdm");
++ neon_pd = pwrdm_lookup("neon_pwrdm");
++
++ /* Reset previous power state registers */
++ pwrdm_clear_all_prev_pwrst(mpu_pd);
++ pwrdm_clear_all_prev_pwrst(neon_pd);
++ pwrdm_clear_all_prev_pwrst(core_pd);
++ pwrdm_clear_all_prev_pwrst(per_pd);
++
++ if (omap_irq_pending())
++ return 0;
++
++ neon_pwrst = pwrdm_read_pwrst(neon_pd);
++
++ /* Program MPU/NEON to target state */
++ if (cx->mpu_state < PWRDM_POWER_ON) {
++ if (neon_pwrst == PWRDM_POWER_ON) {
++ if (cx->mpu_state == PWRDM_POWER_RET)
++ pwrdm_set_next_pwrst(neon_pd, PWRDM_POWER_RET);
++ else if (cx->mpu_state == PWRDM_POWER_OFF)
++ pwrdm_set_next_pwrst(neon_pd, PWRDM_POWER_OFF);
++ }
++ pwrdm_set_next_pwrst(mpu_pd, cx->mpu_state);
++ }
++
++ /* Program CORE to target state */
++ if (cx->core_state < PWRDM_POWER_ON)
++ pwrdm_set_next_pwrst(core_pd, cx->core_state);
++
++ /* Execute ARM wfi */
++ omap_sram_idle();
++
++ /* Program MPU/NEON to ON */
++ if (cx->mpu_state < PWRDM_POWER_ON) {
++ if (neon_pwrst == PWRDM_POWER_ON)
++ pwrdm_set_next_pwrst(neon_pd, PWRDM_POWER_ON);
++ pwrdm_set_next_pwrst(mpu_pd, PWRDM_POWER_ON);
++ }
++
++ if (cx->core_state < PWRDM_POWER_ON)
++ pwrdm_set_next_pwrst(core_pd, PWRDM_POWER_ON);
++
++ getnstimeofday(&ts_postidle);
++ ts_idle = timespec_sub(ts_postidle, ts_preidle);
++ return timespec_to_ns(&ts_idle);
++}
++
++/*
++ * omap3_enter_idle_bm - enter function for states with CPUIDLE_FLAG_CHECK_BM
++ *
++ * This function checks for all the pre-requisites needed for OMAP3 to enter
++ * CORE RET/OFF state. It then calls omap3_enter_idle to program the desired
++ * C state.
++ */
++static int omap3_enter_idle_bm(struct cpuidle_device *dev,
++ struct cpuidle_state *state)
++{
++ struct cpuidle_state *new_state = NULL;
++ int i, j;
++
++ if ((state->flags & CPUIDLE_FLAG_CHECK_BM) && omap3_idle_bm_check()) {
++
++ /* Find current state in list */
++ for (i = 0; i < OMAP3_MAX_STATES; i++)
++ if (state == &dev->states[i])
++ break;
++ BUG_ON(i == OMAP3_MAX_STATES);
++
++ /* Back up to non 'CHECK_BM' state */
++ for (j = i - 1; j > 0; j--) {
++ struct cpuidle_state *s = &dev->states[j];
++
++ if (!(s->flags & CPUIDLE_FLAG_CHECK_BM)) {
++ new_state = s;
++ break;
++ }
++ }
++
++ pr_debug("%s: Bus activity: Entering %s (instead of %s)\n",
++ __FUNCTION__, new_state->name, state->name);
++ }
++
++ return omap3_enter_idle(dev, new_state ? : 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.
++ *
++ C0 . System executing code
++ 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)
++{
++ /* C0 . System executing code */
++ omap3_power_states[0].valid = 1;
++ omap3_power_states[0].type = OMAP3_STATE_C0;
++ omap3_power_states[0].sleep_latency = 0;
++ omap3_power_states[0].wakeup_latency = 0;
++ omap3_power_states[0].threshold = 0;
++ omap3_power_states[0].mpu_state = PWRDM_POWER_ON;
++ omap3_power_states[0].core_state = PWRDM_POWER_ON;
++ omap3_power_states[0].flags = CPUIDLE_FLAG_TIME_VALID |
++ CPUIDLE_FLAG_SHALLOW;
++
++ /* C1 . MPU WFI + Core active */
++ omap3_power_states[1].valid = 1;
++ omap3_power_states[1].type = OMAP3_STATE_C1;
++ omap3_power_states[1].sleep_latency = 10;
++ omap3_power_states[1].wakeup_latency = 10;
++ omap3_power_states[1].threshold = 30;
++ omap3_power_states[1].mpu_state = PWRDM_POWER_ON;
++ omap3_power_states[1].core_state = PWRDM_POWER_ON;
++ omap3_power_states[1].flags = CPUIDLE_FLAG_TIME_VALID |
++ CPUIDLE_FLAG_SHALLOW;
++
++ /* C2 . MPU CSWR + Core active */
++ omap3_power_states[2].valid = 1;
++ omap3_power_states[2].type = OMAP3_STATE_C2;
++ omap3_power_states[2].sleep_latency = 50;
++ omap3_power_states[2].wakeup_latency = 50;
++ omap3_power_states[2].threshold = 300;
++ omap3_power_states[2].mpu_state = PWRDM_POWER_RET;
++ omap3_power_states[2].core_state = PWRDM_POWER_ON;
++ omap3_power_states[2].flags = CPUIDLE_FLAG_TIME_VALID |
++ CPUIDLE_FLAG_BALANCED;
++
++ /* C3 . MPU OFF + Core active */
++ omap3_power_states[3].valid = 0;
++ omap3_power_states[3].type = OMAP3_STATE_C3;
++ omap3_power_states[3].sleep_latency = 1500;
++ omap3_power_states[3].wakeup_latency = 1800;
++ omap3_power_states[3].threshold = 4000;
++ omap3_power_states[3].mpu_state = PWRDM_POWER_OFF;
++ omap3_power_states[3].core_state = PWRDM_POWER_RET;
++ omap3_power_states[3].flags = CPUIDLE_FLAG_TIME_VALID |
++ CPUIDLE_FLAG_BALANCED;
++
++ /* C4 . MPU CSWR + Core CSWR*/
++ omap3_power_states[4].valid = 1;
++ omap3_power_states[4].type = OMAP3_STATE_C4;
++ omap3_power_states[4].sleep_latency = 2500;
++ omap3_power_states[4].wakeup_latency = 7500;
++ omap3_power_states[4].threshold = 12000;
++ omap3_power_states[4].mpu_state = PWRDM_POWER_RET;
++ omap3_power_states[4].core_state = PWRDM_POWER_RET;
++ omap3_power_states[4].flags = CPUIDLE_FLAG_TIME_VALID |
++ CPUIDLE_FLAG_BALANCED | CPUIDLE_FLAG_CHECK_BM;
++
++ /* C5 . MPU OFF + Core CSWR */
++ omap3_power_states[5].valid = 0;
++ omap3_power_states[5].type = OMAP3_STATE_C5;
++ omap3_power_states[5].sleep_latency = 3000;
++ omap3_power_states[5].wakeup_latency = 8500;
++ omap3_power_states[5].threshold = 15000;
++ omap3_power_states[5].mpu_state = PWRDM_POWER_OFF;
++ omap3_power_states[5].core_state = PWRDM_POWER_RET;
++ omap3_power_states[5].flags = CPUIDLE_FLAG_TIME_VALID |
++ CPUIDLE_FLAG_BALANCED | CPUIDLE_FLAG_CHECK_BM;
++
++ /* C6 . MPU OFF + Core OFF */
++ omap3_power_states[6].valid = 0;
++ omap3_power_states[6].type = OMAP3_STATE_C6;
++ omap3_power_states[6].sleep_latency = 10000;
++ omap3_power_states[6].wakeup_latency = 30000;
++ omap3_power_states[6].threshold = 300000;
++ omap3_power_states[6].mpu_state = PWRDM_POWER_OFF;
++ omap3_power_states[6].core_state = PWRDM_POWER_OFF;
++ omap3_power_states[6].flags = CPUIDLE_FLAG_TIME_VALID |
++ CPUIDLE_FLAG_DEEP | 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 f/w
++ * 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;
++
++ omap_init_power_states();
++ cpuidle_register_driver(&omap3_idle_driver);
++
++ dev = &per_cpu(omap3_idle_dev, smp_processor_id());
++
++ for (i = 0; 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;
++ 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",
++ __FUNCTION__);
++ return -EIO;
++ }
++
++ return 0;
++}
++__initcall(omap3_idle_init);
++#endif /* CONFIG_CPU_IDLE */
+Index: linux-omap-2.6/arch/arm/mach-omap2/cpuidle34xx.h
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-omap-2.6/arch/arm/mach-omap2/cpuidle34xx.h 2008-06-09 20:15:39.569121361 +0530
+@@ -0,0 +1,51 @@
++/*
++ * linux/arch/arm/mach-omap2/cpuidle34xx.h
++ *
++ * OMAP3 cpuidle structure definitions
++ *
++ * Copyright (C) 2007-2008 Texas Instruments, Inc.
++ * Written by 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.
++ *
++ * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
++ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
++ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
++ *
++ * History:
++ *
++ */
++
++#ifndef ARCH_ARM_MACH_OMAP2_CPUIDLE_34XX
++#define ARCH_ARM_MACH_OMAP2_CPUIDLE_34XX
++
++#define OMAP3_MAX_STATES 7
++#define OMAP3_STATE_C0 0 /* C0 - System executing code */
++#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 */
++
++extern void omap_sram_idle(void);
++extern int omap3_irq_pending(void);
++
++struct omap3_processor_cx {
++ u8 valid;
++ u8 type;
++ u32 sleep_latency;
++ u32 wakeup_latency;
++ u32 mpu_state;
++ u32 core_state;
++ u32 threshold;
++ u32 flags;
++};
++
++void omap_init_power_states(void);
++int omap3_idle_init(void);
++
++#endif /* ARCH_ARM_MACH_OMAP2_CPUIDLE_34XX */
++
+Index: linux-omap-2.6/arch/arm/mach-omap2/pm34xx.c
+===================================================================
+--- linux-omap-2.6.orig/arch/arm/mach-omap2/pm34xx.c 2008-06-09 20:15:33.855303920 +0530
++++ linux-omap-2.6/arch/arm/mach-omap2/pm34xx.c 2008-06-09 20:16:20.976798343 +0530
+@@ -141,7 +141,7 @@ static irqreturn_t prcm_interrupt_handle
+ return IRQ_HANDLED;
+ }
+
+-static void omap_sram_idle(void)
++void omap_sram_idle(void)
+ {
+ /* Variable to tell what needs to be saved and restored
+ * in omap_sram_idle*/
+@@ -156,6 +156,7 @@ static void omap_sram_idle(void)
+
+ mpu_next_state = pwrdm_read_next_pwrst(mpu_pwrdm);
+ switch (mpu_next_state) {
++ case PWRDM_POWER_ON:
+ case PWRDM_POWER_RET:
+ /* No need to save context */
+ save_state = 0;
+@@ -386,7 +387,9 @@ int __init omap3_pm_init(void)
+
+ prcm_setup_regs();
+
++#ifndef CONFIG_CPU_IDLE
+ pm_idle = omap3_pm_idle;
++#endif
+
+ err1:
+ return ret;
+Index: linux-omap-2.6/drivers/cpuidle/cpuidle.c
+===================================================================
+--- linux-omap-2.6.orig/drivers/cpuidle/cpuidle.c 2008-06-09 20:15:33.856303888 +0530
++++ linux-omap-2.6/drivers/cpuidle/cpuidle.c 2008-06-09 20:15:39.570121329 +0530
+@@ -58,6 +58,11 @@ static void cpuidle_idle_call(void)
+ return;
+ }
+
++#ifdef CONFIG_ARCH_OMAP3
++ local_irq_disable();
++ local_fiq_disable();
++#endif
++
+ /* ask the governor for the next state */
+ next_state = cpuidle_curr_governor->select(dev);
+ if (need_resched())
+@@ -70,6 +75,11 @@ static void cpuidle_idle_call(void)
+ target_state->time += (unsigned long long)dev->last_residency;
+ target_state->usage++;
+
++#ifdef CONFIG_ARCH_OMAP3
++ local_irq_enable();
++ local_fiq_enable();
++#endif
++
+ /* give the governor an opportunity to reflect on the outcome */
+ if (cpuidle_curr_governor->reflect)
+ cpuidle_curr_governor->reflect(dev);
+
+--
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+
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