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Message-ID: <1288824729-11481-1-git-send-email-Dinh.Nguyen@freescale.com>
Date: Wed, 3 Nov 2010 17:52:09 -0500
From: <Dinh.Nguyen@...escale.com>
To: <linux-kernel@...r.kernel.org>
CC: <linux-arm-kernel@...ts.infradead.org>, <linux@....linux.org.uk>,
<s.hauer@...gutronix.de>, <u.kleine-koenig@...gutronix.de>,
<valentin.longchamp@...l.ch>, <daniel@...aq.de>,
<grant.likely@...retlab.ca>, <amit.kucheria@...onical.com>,
Dinh Nguyen <Dinh.Nguyen@...escale.com>
Subject: [PATCH] ARM: imx: Add support for low power suspend on MX51.
From: Dinh Nguyen <Dinh.Nguyen@...escale.com>
Adds initial low power suspend functionality to MX51.
Supports "mem" and "standby" modes.
Signed-off-by: Dinh Nguyen <Dinh.Nguyen@...escale.com>
---
arch/arm/mach-mx5/Makefile | 2 +-
arch/arm/mach-mx5/pm.c | 92 ++++++++++++++++++++++++++++++++++
arch/arm/plat-mxc/include/mach/mxc.h | 6 ++
3 files changed, 99 insertions(+), 1 deletions(-)
create mode 100644 arch/arm/mach-mx5/pm.c
diff --git a/arch/arm/mach-mx5/Makefile b/arch/arm/mach-mx5/Makefile
index 462f177..aefc9a1 100644
--- a/arch/arm/mach-mx5/Makefile
+++ b/arch/arm/mach-mx5/Makefile
@@ -3,7 +3,7 @@
#
# Object file lists.
-obj-y := cpu.o mm.o clock-mx51.o devices.o
+obj-y := cpu.o mm.o clock-mx51.o devices.o pm.o
obj-$(CONFIG_CPU_FREQ_IMX) += cpu_op-mx51.o
obj-$(CONFIG_MACH_MX51_BABBAGE) += board-mx51_babbage.o
diff --git a/arch/arm/mach-mx5/pm.c b/arch/arm/mach-mx5/pm.c
new file mode 100644
index 0000000..a32640e
--- /dev/null
+++ b/arch/arm/mach-mx5/pm.c
@@ -0,0 +1,92 @@
+/*
+ * Copyright (C) 2010 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+#include <linux/kernel.h>
+#include <linux/suspend.h>
+#include <linux/io.h>
+#include <asm/cacheflush.h>
+#include <asm/tlb.h>
+#include <asm/mach/map.h>
+#include <mach/system.h>
+#include "crm_regs.h"
+
+/* set cpu low power mode before WFI instruction */
+static void mxc_cpu_lp_set(enum mxc_cpu_pwr_mode mode)
+{
+ u32 plat_lpc, arm_srpgcr, ccm_clpcr;
+
+ /* always allow platform to issue a deep sleep mode request */
+ plat_lpc = __raw_readl(MXC_CORTEXA8_PLAT_LPC) &
+ ~(MXC_CORTEXA8_PLAT_LPC_DSM);
+ ccm_clpcr = __raw_readl(MXC_CCM_CLPCR) & ~(MXC_CCM_CLPCR_LPM_MASK);
+ arm_srpgcr = __raw_readl(MXC_SRPG_ARM_SRPGCR) & ~(MXC_SRPGCR_PCR);
+
+ switch (mode) {
+ case WAIT_UNCLOCKED_POWER_OFF:
+ case STOP_POWER_OFF:
+ plat_lpc |= MXC_CORTEXA8_PLAT_LPC_DSM
+ | MXC_CORTEXA8_PLAT_LPC_DBG_DSM;
+ if (mode == WAIT_UNCLOCKED_POWER_OFF) {
+ ccm_clpcr |= (0x1 << MXC_CCM_CLPCR_LPM_OFFSET);
+ ccm_clpcr &= ~MXC_CCM_CLPCR_VSTBY;
+ ccm_clpcr &= ~MXC_CCM_CLPCR_SBYOS;
+ } else {
+ ccm_clpcr |= (0x2 << MXC_CCM_CLPCR_LPM_OFFSET);
+ ccm_clpcr |= (0x3 << MXC_CCM_CLPCR_STBY_COUNT_OFFSET);
+ ccm_clpcr |= MXC_CCM_CLPCR_VSTBY;
+ ccm_clpcr |= MXC_CCM_CLPCR_SBYOS;
+ }
+ arm_srpgcr |= MXC_SRPGCR_PCR;
+ break;
+ default:
+ printk(KERN_WARNING "UNKNOWN cpu power mode: %d\n", mode);
+ return;
+ }
+
+ __raw_writel(plat_lpc, MXC_CORTEXA8_PLAT_LPC);
+ __raw_writel(ccm_clpcr, MXC_CCM_CLPCR);
+ __raw_writel(arm_srpgcr, MXC_SRPG_ARM_SRPGCR);
+}
+
+static int mx5_suspend_enter(suspend_state_t state)
+{
+ switch (state) {
+ case PM_SUSPEND_MEM:
+ mxc_cpu_lp_set(STOP_POWER_OFF);
+ break;
+ case PM_SUSPEND_STANDBY:
+ mxc_cpu_lp_set(WAIT_UNCLOCKED_POWER_OFF);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (tzic_enable_wake(0) != 0)
+ return -EAGAIN;
+ cpu_do_idle();
+ return 0;
+}
+
+static int mx5_pm_valid(suspend_state_t state)
+{
+ return (state > PM_SUSPEND_ON && state <= PM_SUSPEND_MAX);
+}
+
+static const struct platform_suspend_ops mx5_suspend_ops = {
+ .valid = mx5_pm_valid,
+ .enter = mx5_suspend_enter,
+};
+
+static int __init mx5_pm_init(void)
+{
+ suspend_set_ops(&mx5_suspend_ops);
+ return 0;
+}
+device_initcall(mx5_pm_init);
diff --git a/arch/arm/plat-mxc/include/mach/mxc.h b/arch/arm/plat-mxc/include/mach/mxc.h
index a42c720..ece13fc 100644
--- a/arch/arm/plat-mxc/include/mach/mxc.h
+++ b/arch/arm/plat-mxc/include/mach/mxc.h
@@ -37,6 +37,12 @@
#ifndef __ASSEMBLY__
extern unsigned int __mxc_cpu_type;
+
+enum mxc_cpu_pwr_mode {
+ WAIT_UNCLOCKED_POWER_OFF, /* WAIT + SRPG */
+ STOP_POWER_OFF, /* STOP + SRPG */
+};
+int tzic_enable_wake(int is_idle);
#endif
#ifdef CONFIG_ARCH_MX1
--
1.6.0.4
--
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