Merge branch 'imx/cpuidle' into next/pm

* imx/cpuidle:
  ARM: imx: Add imx6q cpuidle driver
  ARM: imx: Add imx5 cpuidle
  ARM: imx: Add common imx cpuidle init functionality.
  ARM: imx: Enable imx53 low power idle
  ARM: imx: clean and consolidate imx5 suspend and idle code
  ARM: imx: Add comments to tzic_enable_waker()
  ARM: imx: Modify IMX_IO_P2V macro

Resolved trivial context conflict in arch/arm/plat-mxc/include/mach/common.h

Signed-off-by: Olof Johansson <olof@lixom.net>

arch/arm/mach-imx/clk-imx51-imx53.c

@@ -279,6 +279,7 @@ static void __init mx5_clocks_common_init(unsigned long rate_ckil,
 	clk_register_clkdev(clk[dummy], NULL, "imx-keypad");
 	clk_register_clkdev(clk[tve_gate], NULL, "imx-tve.0");
 	clk_register_clkdev(clk[ipu_di1_gate], "di1", "imx-tve.0");
+	clk_register_clkdev(clk[gpc_dvfs], "gpc_dvfs", NULL);
 
 	/* Set SDHC parents to be PLL2 */
 	clk_set_parent(clk[esdhc_a_sel], clk[pll2_sw]);
@@ -336,7 +337,6 @@ int __init mx51_clocks_init(unsigned long rate_ckil, unsigned long rate_osc,
 	clk_register_clkdev(clk[mx51_mipi], "mipi_hsp", NULL);
 	clk_register_clkdev(clk[vpu_gate], NULL, "imx51-vpu.0");
 	clk_register_clkdev(clk[fec_gate], NULL, "imx27-fec.0");
-	clk_register_clkdev(clk[gpc_dvfs], "gpc_dvfs", NULL);
 	clk_register_clkdev(clk[ipu_gate], "bus", "imx51-ipu");
 	clk_register_clkdev(clk[ipu_di0_gate], "di0", "imx51-ipu");
 	clk_register_clkdev(clk[ipu_di1_gate], "di1", "imx51-ipu");

arch/arm/mach-imx/imx53-dt.c

@@ -147,6 +147,7 @@ DT_MACHINE_START(IMX53_DT, "Freescale i.MX53 (Device Tree Support)")
 	.handle_irq	= imx53_handle_irq,
 	.timer		= &imx53_timer,
 	.init_machine	= imx53_dt_init,
+	.init_late	= imx53_init_late,
 	.dt_compat	= imx53_dt_board_compat,
 	.restart	= mxc_restart,
 MACHINE_END

arch/arm/mach-imx/mach-imx6q.c

@@ -12,7 +12,9 @@
 
 #include <linux/clk.h>
 #include <linux/clkdev.h>
+#include <linux/cpuidle.h>
 #include <linux/delay.h>
+#include <linux/export.h>
 #include <linux/init.h>
 #include <linux/io.h>
 #include <linux/irq.h>
@@ -24,15 +26,18 @@
 #include <linux/pinctrl/machine.h>
 #include <linux/phy.h>
 #include <linux/micrel_phy.h>
+#include <asm/cpuidle.h>
 #include <asm/smp_twd.h>
 #include <asm/hardware/cache-l2x0.h>
 #include <asm/hardware/gic.h>
 #include <asm/mach/arch.h>
 #include <asm/mach/time.h>
 #include <asm/system_misc.h>
 #include <mach/common.h>
+#include <mach/cpuidle.h>
 #include <mach/hardware.h>
 
+
 void imx6q_restart(char mode, const char *cmd)
 {
 	struct device_node *np;
@@ -129,6 +134,19 @@ static void __init imx6q_init_machine(void)
 	imx6q_pm_init();
 }
 
+static struct cpuidle_driver imx6q_cpuidle_driver = {
+	.name			= "imx6q_cpuidle",
+	.owner			= THIS_MODULE,
+	.en_core_tk_irqen	= 1,
+	.states[0]		= ARM_CPUIDLE_WFI_STATE,
+	.state_count		= 1,
+};
+
+static void __init imx6q_init_late(void)
+{
+	imx_cpuidle_init(&imx6q_cpuidle_driver);
+}
+
 static void __init imx6q_map_io(void)
 {
 	imx_lluart_map_io();
@@ -186,6 +204,7 @@ DT_MACHINE_START(IMX6Q, "Freescale i.MX6 Quad (Device Tree)")
 	.handle_irq	= imx6q_handle_irq,
 	.timer		= &imx6q_timer,
 	.init_machine	= imx6q_init_machine,
+	.init_late      = imx6q_init_late,
 	.dt_compat	= imx6q_dt_compat,
 	.restart	= imx6q_restart,
 MACHINE_END

arch/arm/mach-imx/mach-mx53_ard.c

@@ -266,5 +266,6 @@ MACHINE_START(MX53_ARD, "Freescale MX53 ARD Board")
 	.handle_irq = imx53_handle_irq,
 	.timer = &mx53_ard_timer,
 	.init_machine = mx53_ard_board_init,
+	.init_late	= imx53_init_late,
 	.restart	= mxc_restart,
 MACHINE_END

arch/arm/mach-imx/mach-mx53_evk.c

@@ -174,5 +174,6 @@ MACHINE_START(MX53_EVK, "Freescale MX53 EVK Board")
 	.handle_irq = imx53_handle_irq,
 	.timer = &mx53_evk_timer,
 	.init_machine = mx53_evk_board_init,
+	.init_late	= imx53_init_late,
 	.restart	= mxc_restart,
 MACHINE_END

arch/arm/mach-imx/mach-mx53_loco.c

@@ -316,5 +316,6 @@ MACHINE_START(MX53_LOCO, "Freescale MX53 LOCO Board")
 	.handle_irq = imx53_handle_irq,
 	.timer = &mx53_loco_timer,
 	.init_machine = mx53_loco_board_init,
+	.init_late	= imx53_init_late,
 	.restart	= mxc_restart,
 MACHINE_END

arch/arm/mach-imx/mach-mx53_smd.c

@@ -163,5 +163,6 @@ MACHINE_START(MX53_SMD, "Freescale MX53 SMD Board")
 	.handle_irq = imx53_handle_irq,
 	.timer = &mx53_smd_timer,
 	.init_machine = mx53_smd_board_init,
+	.init_late	= imx53_init_late,
 	.restart	= mxc_restart,
 MACHINE_END

arch/arm/mach-imx/mm-imx5.c

@@ -16,32 +16,13 @@
 #include <linux/clk.h>
 #include <linux/pinctrl/machine.h>
 
-#include <asm/system_misc.h>
 #include <asm/mach/map.h>
 
 #include <mach/hardware.h>
 #include <mach/common.h>
 #include <mach/devices-common.h>
 #include <mach/iomux-v3.h>
 
-static struct clk *gpc_dvfs_clk;
-
-static void imx5_idle(void)
-{
-	/* gpc clock is needed for SRPG */
-	if (gpc_dvfs_clk == NULL) {
-		gpc_dvfs_clk = clk_get(NULL, "gpc_dvfs");
-		if (IS_ERR(gpc_dvfs_clk))
-			return;
-		clk_prepare(gpc_dvfs_clk);
-	}
-	clk_enable(gpc_dvfs_clk);
-	mx5_cpu_lp_set(WAIT_UNCLOCKED_POWER_OFF);
-	if (!tzic_enable_wake())
-		cpu_do_idle();
-	clk_disable(gpc_dvfs_clk);
-}
-
 /*
  * Define the MX50 memory map.
  */
@@ -105,7 +86,6 @@ void __init imx51_init_early(void)
 	mxc_set_cpu_type(MXC_CPU_MX51);
 	mxc_iomux_v3_init(MX51_IO_ADDRESS(MX51_IOMUXC_BASE_ADDR));
 	mxc_arch_reset_init(MX51_IO_ADDRESS(MX51_WDOG1_BASE_ADDR));
-	arm_pm_idle = imx5_idle;
 }
 
 void __init imx53_init_early(void)
@@ -243,4 +223,10 @@ void __init imx53_soc_init(void)
 void __init imx51_init_late(void)
 {
 	mx51_neon_fixup();
+	imx51_pm_init();
+}
+
+void __init imx53_init_late(void)
+{
+	imx53_pm_init();
 }

arch/arm/mach-imx/pm-imx5.c

@@ -12,19 +12,30 @@
 #include <linux/clk.h>
 #include <linux/io.h>
 #include <linux/err.h>
+#include <linux/export.h>
 #include <asm/cacheflush.h>
+#include <asm/system_misc.h>
 #include <asm/tlbflush.h>
 #include <mach/common.h>
+#include <mach/cpuidle.h>
 #include <mach/hardware.h>
 #include "crm-regs-imx5.h"
 
-static struct clk *gpc_dvfs_clk;
+/*
+ * The WAIT_UNCLOCKED_POWER_OFF state only requires <= 500ns to exit.
+ * This is also the lowest power state possible without affecting
+ * non-cpu parts of the system.  For these reasons, imx5 should default
+ * to always using this state for cpu idling.  The PM_SUSPEND_STANDBY also
+ * uses this state and needs to take no action when registers remain confgiured
+ * for this state.
+ */
+#define IMX5_DEFAULT_CPU_IDLE_STATE WAIT_UNCLOCKED_POWER_OFF
 
 /*
  * set cpu low power mode before WFI instruction. This function is called
  * mx5 because it can be used for mx50, mx51, and mx53.
  */
-void mx5_cpu_lp_set(enum mxc_cpu_pwr_mode mode)
+static void mx5_cpu_lp_set(enum mxc_cpu_pwr_mode mode)
 {
 	u32 plat_lpc, arm_srpgcr, ccm_clpcr;
 	u32 empgc0, empgc1;
@@ -87,19 +98,14 @@ void mx5_cpu_lp_set(enum mxc_cpu_pwr_mode mode)
 	}
 }
 
-static int mx5_suspend_prepare(void)
-{
-	return clk_prepare_enable(gpc_dvfs_clk);
-}
-
 static int mx5_suspend_enter(suspend_state_t state)
 {
 	switch (state) {
 	case PM_SUSPEND_MEM:
 		mx5_cpu_lp_set(STOP_POWER_OFF);
 		break;
 	case PM_SUSPEND_STANDBY:
-		mx5_cpu_lp_set(WAIT_UNCLOCKED_POWER_OFF);
+		/* DEFAULT_IDLE_STATE already configured */
 		break;
 	default:
 		return -EINVAL;
@@ -114,12 +120,10 @@ static int mx5_suspend_enter(suspend_state_t state)
 		__raw_writel(0, MXC_SRPG_EMPGC1_SRPGCR);
 	}
 	cpu_do_idle();
-	return 0;
-}
 
-static void mx5_suspend_finish(void)
-{
-	clk_disable_unprepare(gpc_dvfs_clk);
+	/* return registers to default idle state */
+	mx5_cpu_lp_set(IMX5_DEFAULT_CPU_IDLE_STATE);
+	return 0;
 }
 
 static int mx5_pm_valid(suspend_state_t state)
@@ -129,25 +133,80 @@ static int mx5_pm_valid(suspend_state_t state)
 
 static const struct platform_suspend_ops mx5_suspend_ops = {
 	.valid = mx5_pm_valid,
-	.prepare = mx5_suspend_prepare,
 	.enter = mx5_suspend_enter,
-	.finish = mx5_suspend_finish,
 };
 
-static int __init mx5_pm_init(void)
+static inline int imx5_cpu_do_idle(void)
+{
+	int ret = tzic_enable_wake();
+
+	if (likely(!ret))
+		cpu_do_idle();
+
+	return ret;
+}
+
+static void imx5_pm_idle(void)
+{
+	imx5_cpu_do_idle();
+}
+
+static int imx5_cpuidle_enter(struct cpuidle_device *dev,
+				struct cpuidle_driver *drv, int idx)
+{
+	int ret;
+
+	ret = imx5_cpu_do_idle();
+	if (ret < 0)
+		return ret;
+
+	return idx;
+}
+
+static struct cpuidle_driver imx5_cpuidle_driver = {
+	.name			= "imx5_cpuidle",
+	.owner			= THIS_MODULE,
+	.en_core_tk_irqen	= 1,
+	.states[0]	= {
+		.enter			= imx5_cpuidle_enter,
+		.exit_latency		= 2,
+		.target_residency	= 1,
+		.flags			= CPUIDLE_FLAG_TIME_VALID,
+		.name			= "IMX5 SRPG",
+		.desc			= "CPU state retained,powered off",
+	},
+	.state_count		= 1,
+};
+
+static int __init imx5_pm_common_init(void)
 {
-	if (!cpu_is_mx51() && !cpu_is_mx53())
-		return 0;
+	int ret;
+	struct clk *gpc_dvfs_clk = clk_get(NULL, "gpc_dvfs");
 
-	if (gpc_dvfs_clk == NULL)
-		gpc_dvfs_clk = clk_get(NULL, "gpc_dvfs");
+	if (IS_ERR(gpc_dvfs_clk))
+		return PTR_ERR(gpc_dvfs_clk);
 
-	if (!IS_ERR(gpc_dvfs_clk)) {
-		if (cpu_is_mx51())
-			suspend_set_ops(&mx5_suspend_ops);
-	} else
-		return -EPERM;
+	ret = clk_prepare_enable(gpc_dvfs_clk);
+	if (ret)
+		return ret;
 
+	arm_pm_idle = imx5_pm_idle;
+
+	/* Set the registers to the default cpu idle state. */
+	mx5_cpu_lp_set(IMX5_DEFAULT_CPU_IDLE_STATE);
+
+	imx_cpuidle_init(&imx5_cpuidle_driver);
 	return 0;
 }
-device_initcall(mx5_pm_init);
+
+void __init imx51_pm_init(void)
+{
+	int ret = imx5_pm_common_init();
+	if (!ret)
+		suspend_set_ops(&mx5_suspend_ops);
+}
+
+void __init imx53_pm_init(void)
+{
+	imx5_pm_common_init();
+}

arch/arm/plat-mxc/Makefile

@@ -16,6 +16,7 @@ obj-$(CONFIG_MXC_ULPI) += ulpi.o
 obj-$(CONFIG_MXC_USE_EPIT) += epit.o
 obj-$(CONFIG_MXC_DEBUG_BOARD) += 3ds_debugboard.o
 obj-$(CONFIG_CPU_FREQ_IMX)    += cpufreq.o
+obj-$(CONFIG_CPU_IDLE) += cpuidle.o
 ifdef CONFIG_SND_IMX_SOC
 obj-y += ssi-fiq.o
 obj-y += ssi-fiq-ksym.o