diff options
Diffstat (limited to 'recipes/linux/linux-kirkwood/0001--ARM-Kirkwood-CPU-idle-driver.patch')
| -rw-r--r-- | recipes/linux/linux-kirkwood/0001--ARM-Kirkwood-CPU-idle-driver.patch | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/recipes/linux/linux-kirkwood/0001--ARM-Kirkwood-CPU-idle-driver.patch b/recipes/linux/linux-kirkwood/0001--ARM-Kirkwood-CPU-idle-driver.patch new file mode 100644 index 0000000000..29e7851c7f --- /dev/null +++ b/recipes/linux/linux-kirkwood/0001--ARM-Kirkwood-CPU-idle-driver.patch @@ -0,0 +1,162 @@ +From 286f96f0b2e1ee5a124effba59a01f8d4bf69ddf Mon Sep 17 00:00:00 2001 +From: Rabeeh Khoury <rabeeh@marvell.com> +Date: Tue, 24 Mar 2009 16:10:15 +0200 +Subject: [PATCH] [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> +--- + arch/arm/configs/kirkwood_defconfig | 4 +- + arch/arm/mach-kirkwood/Makefile | 2 + + arch/arm/mach-kirkwood/cpuidle.c | 96 ++++++++++++++++++++++++ + arch/arm/mach-kirkwood/include/mach/kirkwood.h | 1 + + 4 files changed, 102 insertions(+), 1 deletions(-) + create mode 100644 arch/arm/mach-kirkwood/cpuidle.c + +diff --git a/arch/arm/configs/kirkwood_defconfig b/arch/arm/configs/kirkwood_defconfig +index c367ae4..a99b3eb 100644 +--- a/arch/arm/configs/kirkwood_defconfig ++++ b/arch/arm/configs/kirkwood_defconfig +@@ -263,7 +263,9 @@ 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 +diff --git a/arch/arm/mach-kirkwood/Makefile b/arch/arm/mach-kirkwood/Makefile +index 8f03c9b..f21f35d 100644 +--- a/arch/arm/mach-kirkwood/Makefile ++++ b/arch/arm/mach-kirkwood/Makefile +@@ -5,3 +5,5 @@ obj-$(CONFIG_MACH_RD88F6192_NAS) += rd88f6192-nas-setup.o + obj-$(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 +diff --git a/arch/arm/mach-kirkwood/cpuidle.c b/arch/arm/mach-kirkwood/cpuidle.c +new file mode 100644 +index 0000000..43052c7 +--- /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); +diff --git a/arch/arm/mach-kirkwood/include/mach/kirkwood.h b/arch/arm/mach-kirkwood/include/mach/kirkwood.h +index 38c9868..e9ae73d 100644 +--- a/arch/arm/mach-kirkwood/include/mach/kirkwood.h ++++ b/arch/arm/mach-kirkwood/include/mach/kirkwood.h +@@ -86,6 +86,7 @@ + */ + #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) +-- +1.6.0.4 + |