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