mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-12-13 11:17:31 +02:00
24aca199ae
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@16250 3c298f89-4303-0410-b956-a3cf2f4a3e73
147 lines
4.5 KiB
Diff
147 lines
4.5 KiB
Diff
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)
|