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-rw-r--r--target/linux/kirkwood/patches/004-cpuidle.patch146
1 files changed, 146 insertions, 0 deletions
diff --git a/target/linux/kirkwood/patches/004-cpuidle.patch b/target/linux/kirkwood/patches/004-cpuidle.patch
new file mode 100644
index 0000000..876fe89
--- /dev/null
+++ b/target/linux/kirkwood/patches/004-cpuidle.patch
@@ -0,0 +1,146 @@
+From: Rabeeh Khoury <rabeeh@marvell.com>
+Date: Tue, 24 Mar 2009 14:10:15 +0000 (+0200)
+Subject: [ARM] Kirkwood: CPU idle driver
+X-Git-Url: http://git.marvell.com/?p=orion.git;a=commitdiff_plain;h=039b97666e1335eac517c7d35a0fa1143af689f0;hp=56a50adda49b2020156616c4eb15353e0f9ad7de
+
+[ARM] Kirkwood: CPU idle driver
+
+The patch adds support for Kirkwood cpu idle.
+Two idle states are defined:
+1. Wait-for-interrupt (replacing default kirkwood wfi)
+2. Wait-for-interrupt and DDR self refresh
+
+Signed-off-by: Rabeeh Khoury <rabeeh@marvell.com>
+Signed-off-by: Nicolas Pitre <nico@marvell.com>
+---
+
+--- a/arch/arm/configs/kirkwood_defconfig
++++ b/arch/arm/configs/kirkwood_defconfig
+@@ -270,7 +270,9 @@ CONFIG_CMDLINE=""
+ #
+ # CPU Power Management
+ #
+-# CONFIG_CPU_IDLE is not set
++CONFIG_CPU_IDLE=y
++CONFIG_CPU_IDLE_GOV_LADDER=y
++CONFIG_CPU_IDLE_GOV_MENU=y
+
+ #
+ # Floating point emulation
+--- a/arch/arm/mach-kirkwood/Makefile
++++ b/arch/arm/mach-kirkwood/Makefile
+@@ -5,3 +5,5 @@ obj-$(CONFIG_MACH_RD88F6192_NAS) += rd88
+ obj-$(CONFIG_MACH_RD88F6281) += rd88f6281-setup.o
+ obj-$(CONFIG_MACH_SHEEVAPLUG) += sheevaplug-setup.o
+ obj-$(CONFIG_MACH_TS219) += ts219-setup.o
++
++obj-$(CONFIG_CPU_IDLE) += cpuidle.o
+--- /dev/null
++++ b/arch/arm/mach-kirkwood/cpuidle.c
+@@ -0,0 +1,96 @@
++/*
++ * arch/arm/mach-kirkwood/cpuidle.c
++ *
++ * CPU idle Marvell Kirkwood SoCs
++ *
++ * This file is licensed under the terms of the GNU General Public
++ * License version 2. This program is licensed "as is" without any
++ * warranty of any kind, whether express or implied.
++ *
++ * The cpu idle uses wait-for-interrupt and DDR self refresh in order
++ * to implement two idle states -
++ * #1 wait-for-interrupt
++ * #2 wait-for-interrupt and DDR self refresh
++ */
++
++#include <linux/kernel.h>
++#include <linux/init.h>
++#include <linux/platform_device.h>
++#include <linux/cpuidle.h>
++#include <asm/io.h>
++#include <asm/proc-fns.h>
++#include <mach/kirkwood.h>
++
++#define KIRKWOOD_MAX_STATES 2
++
++static struct cpuidle_driver kirkwood_idle_driver = {
++ .name = "kirkwood_idle",
++ .owner = THIS_MODULE,
++};
++
++static DEFINE_PER_CPU(struct cpuidle_device, kirkwood_cpuidle_device);
++
++/* Actual code that puts the SoC in different idle states */
++static int kirkwood_enter_idle(struct cpuidle_device *dev,
++ struct cpuidle_state *state)
++{
++ struct timeval before, after;
++ int idle_time;
++
++ local_irq_disable();
++ do_gettimeofday(&before);
++ if (state == &dev->states[0])
++ /* Wait for interrupt state */
++ cpu_do_idle();
++ else if (state == &dev->states[1]) {
++ /*
++ * Following write will put DDR in self refresh.
++ * Note that we have 256 cycles before DDR puts it
++ * self in self-refresh, so the wait-for-interrupt
++ * call afterwards won't get the DDR from self refresh
++ * mode.
++ */
++ writel(0x7, DDR_OPERATION_BASE);
++ cpu_do_idle();
++ }
++ do_gettimeofday(&after);
++ local_irq_enable();
++ idle_time = (after.tv_sec - before.tv_sec) * USEC_PER_SEC +
++ (after.tv_usec - before.tv_usec);
++ return idle_time;
++}
++
++/* Initialize CPU idle by registering the idle states */
++static int kirkwood_init_cpuidle(void)
++{
++ struct cpuidle_device *device;
++
++ cpuidle_register_driver(&kirkwood_idle_driver);
++
++ device = &per_cpu(kirkwood_cpuidle_device, smp_processor_id());
++ device->state_count = KIRKWOOD_MAX_STATES;
++
++ /* Wait for interrupt state */
++ device->states[0].enter = kirkwood_enter_idle;
++ device->states[0].exit_latency = 1;
++ device->states[0].target_residency = 10000;
++ device->states[0].flags = CPUIDLE_FLAG_TIME_VALID;
++ strcpy(device->states[0].name, "WFI");
++ strcpy(device->states[0].desc, "Wait for interrupt");
++
++ /* Wait for interrupt and DDR self refresh state */
++ device->states[1].enter = kirkwood_enter_idle;
++ device->states[1].exit_latency = 10;
++ device->states[1].target_residency = 10000;
++ device->states[1].flags = CPUIDLE_FLAG_TIME_VALID;
++ strcpy(device->states[1].name, "DDR SR");
++ strcpy(device->states[1].desc, "WFI and DDR Self Refresh");
++
++ if (cpuidle_register_device(device)) {
++ printk(KERN_ERR "kirkwood_init_cpuidle: Failed registering\n");
++ return -EIO;
++ }
++ return 0;
++}
++
++device_initcall(kirkwood_init_cpuidle);
+--- a/arch/arm/mach-kirkwood/include/mach/kirkwood.h
++++ b/arch/arm/mach-kirkwood/include/mach/kirkwood.h
+@@ -48,6 +48,7 @@
+ */
+ #define DDR_VIRT_BASE (KIRKWOOD_REGS_VIRT_BASE | 0x00000)
+ #define DDR_WINDOW_CPU_BASE (DDR_VIRT_BASE | 0x1500)
++#define DDR_OPERATION_BASE (DDR_VIRT_BASE | 0x1418)
+
+ #define DEV_BUS_PHYS_BASE (KIRKWOOD_REGS_PHYS_BASE | 0x10000)
+ #define DEV_BUS_VIRT_BASE (KIRKWOOD_REGS_VIRT_BASE | 0x10000)