From: Dinh Nguyen <[email protected]>
Adds initial low power suspend functionality to MX51.
Supports "mem" and "standby" modes.
Signed-off-by: Dinh Nguyen <[email protected]>
---
arch/arm/mach-mx5/Makefile | 1 +
arch/arm/mach-mx5/pm.c | 70 ++++++++++++++++++++++++++++++++++
arch/arm/plat-mxc/include/mach/mxc.h | 1 +
3 files changed, 72 insertions(+), 0 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..25b44d1 100644
--- a/arch/arm/mach-mx5/Makefile
+++ b/arch/arm/mach-mx5/Makefile
@@ -5,6 +5,7 @@
# Object file lists.
obj-y := cpu.o mm.o clock-mx51.o devices.o
+obj-$(CONFIG_PM) += pm.o
obj-$(CONFIG_CPU_FREQ_IMX) += cpu_op-mx51.o
obj-$(CONFIG_MACH_MX51_BABBAGE) += board-mx51_babbage.o
obj-$(CONFIG_MACH_MX51_3DS) += board-mx51_3ds.o
diff --git a/arch/arm/mach-mx5/pm.c b/arch/arm/mach-mx5/pm.c
new file mode 100644
index 0000000..417cce1
--- /dev/null
+++ b/arch/arm/mach-mx5/pm.c
@@ -0,0 +1,70 @@
+/*
+ * 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/suspend.h>
+#include <asm/mach/map.h>
+#include <mach/system.h>
+#include "crm_regs.h"
+
+static int mx5_suspend_enter(suspend_state_t state)
+{
+ u32 plat_lpc, arm_srpgcr, ccm_clpcr;
+
+ /* always allow platform to issue a deep sleep mode request */
+ ccm_clpcr = __raw_readl(MXC_CCM_CLPCR) & ~(MXC_CCM_CLPCR_LPM_MASK);
+
+ switch (state) {
+ case PM_SUSPEND_MEM:
+ 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;
+ break;
+ case PM_SUSPEND_STANDBY:
+ ccm_clpcr |= (0x1 << MXC_CCM_CLPCR_LPM_OFFSET);
+ ccm_clpcr &= ~MXC_CCM_CLPCR_VSTBY;
+ ccm_clpcr &= ~MXC_CCM_CLPCR_SBYOS;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ plat_lpc |= MXC_CORTEXA8_PLAT_LPC_DSM
+ | MXC_CORTEXA8_PLAT_LPC_DBG_DSM;
+ arm_srpgcr |= MXC_SRPGCR_PCR;
+
+ __raw_writel(plat_lpc, MXC_CORTEXA8_PLAT_LPC);
+ __raw_writel(arm_srpgcr, MXC_SRPG_ARM_SRPGCR);
+ __raw_writel(ccm_clpcr, MXC_CCM_CLPCR);
+
+ 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)
+{
+ if (cpu_is_mx51())
+ 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..dafacfd 100644
--- a/arch/arm/plat-mxc/include/mach/mxc.h
+++ b/arch/arm/plat-mxc/include/mach/mxc.h
@@ -37,6 +37,7 @@
#ifndef __ASSEMBLY__
extern unsigned int __mxc_cpu_type;
+int tzic_enable_wake(int is_idle);
#endif
#ifdef CONFIG_ARCH_MX1
--
1.6.0.4
Hi Sascha/Uwe,
I was wondering if you had time to digest this patch?
Thanks,
Dinh
>-----Original Message-----
>From: Nguyen Dinh-R00091
>Sent: Wednesday, November 10, 2010 2:07 PM
>To: [email protected]
>Cc: [email protected]; [email protected];
[email protected]; u.kleine-
>[email protected]; [email protected]; [email protected];
Nguyen Dinh-R00091
>Subject: [PATCHv3] ARM: imx: Add support for low power suspend on MX51.
>
>From: Dinh Nguyen <[email protected]>
>
>Adds initial low power suspend functionality to MX51.
>Supports "mem" and "standby" modes.
>
>Signed-off-by: Dinh Nguyen <[email protected]>
>---
> arch/arm/mach-mx5/Makefile | 1 +
> arch/arm/mach-mx5/pm.c | 70
++++++++++++++++++++++++++++++++++
> arch/arm/plat-mxc/include/mach/mxc.h | 1 +
> 3 files changed, 72 insertions(+), 0 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..25b44d1 100644
>--- a/arch/arm/mach-mx5/Makefile
>+++ b/arch/arm/mach-mx5/Makefile
>@@ -5,6 +5,7 @@
> # Object file lists.
> obj-y := cpu.o mm.o clock-mx51.o devices.o
>
>+obj-$(CONFIG_PM) += pm.o
> obj-$(CONFIG_CPU_FREQ_IMX) += cpu_op-mx51.o
> obj-$(CONFIG_MACH_MX51_BABBAGE) += board-mx51_babbage.o
> obj-$(CONFIG_MACH_MX51_3DS) += board-mx51_3ds.o
>diff --git a/arch/arm/mach-mx5/pm.c b/arch/arm/mach-mx5/pm.c
>new file mode 100644
>index 0000000..417cce1
>--- /dev/null
>+++ b/arch/arm/mach-mx5/pm.c
>@@ -0,0 +1,70 @@
>+/*
>+ * 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/suspend.h>
>+#include <asm/mach/map.h>
>+#include <mach/system.h>
>+#include "crm_regs.h"
>+
>+static int mx5_suspend_enter(suspend_state_t state)
>+{
>+ u32 plat_lpc, arm_srpgcr, ccm_clpcr;
>+
>+ /* always allow platform to issue a deep sleep mode request */
>+ ccm_clpcr = __raw_readl(MXC_CCM_CLPCR) &
~(MXC_CCM_CLPCR_LPM_MASK);
>+
>+ switch (state) {
>+ case PM_SUSPEND_MEM:
>+ 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;
>+ break;
>+ case PM_SUSPEND_STANDBY:
>+ ccm_clpcr |= (0x1 << MXC_CCM_CLPCR_LPM_OFFSET);
>+ ccm_clpcr &= ~MXC_CCM_CLPCR_VSTBY;
>+ ccm_clpcr &= ~MXC_CCM_CLPCR_SBYOS;
>+ break;
>+ default:
>+ return -EINVAL;
>+ }
>+
>+ plat_lpc |= MXC_CORTEXA8_PLAT_LPC_DSM
>+ | MXC_CORTEXA8_PLAT_LPC_DBG_DSM;
>+ arm_srpgcr |= MXC_SRPGCR_PCR;
>+
>+ __raw_writel(plat_lpc, MXC_CORTEXA8_PLAT_LPC);
>+ __raw_writel(arm_srpgcr, MXC_SRPG_ARM_SRPGCR);
>+ __raw_writel(ccm_clpcr, MXC_CCM_CLPCR);
>+
>+ 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)
>+{
>+ if (cpu_is_mx51())
>+ 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..dafacfd 100644
>--- a/arch/arm/plat-mxc/include/mach/mxc.h
>+++ b/arch/arm/plat-mxc/include/mach/mxc.h
>@@ -37,6 +37,7 @@
>
> #ifndef __ASSEMBLY__
> extern unsigned int __mxc_cpu_type;
>+int tzic_enable_wake(int is_idle);
> #endif
>
> #ifdef CONFIG_ARCH_MX1
>--
>1.6.0.4