[PATCH v1] ARM: imx6: add pm_power_off support for i.mx6 chips

[Robin Gong <b38343@xxxxxxxxxxxxx>]

All chips of i.mx6 can be powered off by programming SNVS.
For example :
On i.mx6q-sabresd board, PMIC_ON_REQ connect with external
pmic ON/OFF pin, that will cause the whole PMIC powered off
except VSNVS. And system can restart once PMIC_ON_REQ goes
high by push POWRER key.

Signed-off-by: Robin Gong <b38343@xxxxxxxxxxxxx>
---
 arch/arm/mach-imx/common.h      |  1 +
 arch/arm/mach-imx/mach-imx6q.c  |  2 ++
 arch/arm/mach-imx/mach-imx6sl.c |  2 ++
 arch/arm/mach-imx/mach-imx6sx.c |  2 ++
 arch/arm/mach-imx/system.c      | 22 +++++++++++++++++++++-
 5 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-imx/common.h b/arch/arm/mach-imx/common.h
index 1dabf43..baca11a 100644
--- a/arch/arm/mach-imx/common.h
+++ b/arch/arm/mach-imx/common.h
@@ -62,6 +62,7 @@ void mxc_set_cpu_type(unsigned int type);
 void mxc_restart(enum reboot_mode, const char *);
 void mxc_arch_reset_init(void __iomem *);
 void mxc_arch_reset_init_dt(void);
+void mxc_power_off_init(void);
 int mx51_revision(void);
 int mx53_revision(void);
 void imx_set_aips(void __iomem *);
diff --git a/arch/arm/mach-imx/mach-imx6q.c b/arch/arm/mach-imx/mach-imx6q.c
index d51c6e9..3d6610d 100644
--- a/arch/arm/mach-imx/mach-imx6q.c
+++ b/arch/arm/mach-imx/mach-imx6q.c
@@ -270,6 +270,8 @@ static void __init imx6q_init_machine(void)
 
 	mxc_arch_reset_init_dt();
 
+	mxc_power_off_init();
+
 	parent = imx_soc_device_init();
 	if (parent == NULL)
 		pr_warn("failed to initialize soc device\n");
diff --git a/arch/arm/mach-imx/mach-imx6sl.c b/arch/arm/mach-imx/mach-imx6sl.c
index ed263a2..c07e6e8 100644
--- a/arch/arm/mach-imx/mach-imx6sl.c
+++ b/arch/arm/mach-imx/mach-imx6sl.c
@@ -50,6 +50,8 @@ static void __init imx6sl_init_machine(void)
 
 	mxc_arch_reset_init_dt();
 
+	mxc_power_off_init();
+
 	parent = imx_soc_device_init();
 	if (parent == NULL)
 		pr_warn("failed to initialize soc device\n");
diff --git a/arch/arm/mach-imx/mach-imx6sx.c b/arch/arm/mach-imx/mach-imx6sx.c
index 3de3b73..68ea070 100644
--- a/arch/arm/mach-imx/mach-imx6sx.c
+++ b/arch/arm/mach-imx/mach-imx6sx.c
@@ -20,6 +20,8 @@ static void __init imx6sx_init_machine(void)
 
 	mxc_arch_reset_init_dt();
 
+	mxc_power_off_init();
+
 	parent = imx_soc_device_init();
 	if (parent == NULL)
 		pr_warn("failed to initialize soc device\n");
diff --git a/arch/arm/mach-imx/system.c b/arch/arm/mach-imx/system.c
index d14c33f..925fb29 100644
--- a/arch/arm/mach-imx/system.c
+++ b/arch/arm/mach-imx/system.c
@@ -23,6 +23,7 @@
 #include <linux/delay.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
+#include <linux/pm.h>
 
 #include <asm/system_misc.h>
 #include <asm/proc-fns.h>
@@ -32,7 +33,9 @@
 #include "common.h"
 #include "hardware.h"
 
-static void __iomem *wdog_base;
+#define SNVS_LPCR               0x04
+
+static void __iomem *wdog_base, *snvs_base;
 static struct clk *wdog_clk;
 
 /*
@@ -104,6 +107,23 @@ void __init mxc_arch_reset_init_dt(void)
 		clk_prepare(wdog_clk);
 }
 
+static void power_off_snvs(void)
+{
+	 u32 value = readl(snvs_base + SNVS_LPCR);
+	/* set TOP and DP_EN bit */
+	writel(value | 0x60, snvs_base + SNVS_LPCR);
+}
+
+void __init mxc_power_off_init(void)
+{
+	struct device_node *np;
+
+	np = of_find_compatible_node(NULL, NULL, "fsl,sec-v4.0-mon-rtc-lp");
+	snvs_base = of_iomap(np, 0);
+	WARN_ON(!snvs_base);
+	pm_power_off = power_off_snvs;
+}
+
 #ifdef CONFIG_CACHE_L2X0
 void __init imx_init_l2cache(void)
 {
-- 
1.9.1

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