[PATCH v2] arm/ls1021a: Add Sleep feature for ls1021

[Dongsheng Wang]

From: Wang Dongsheng <dongsheng.wang at freescale.com>

Add system STANDBY implement for ls1021 platform.

Signed-off-by: Chenhui Zhao <chenhui.zhao at freescale.com>
Signed-off-by: Wang Dongsheng <dongsheng.wang at freescale.com>
---
*v2*:
- Remove PSCI code. Just implement STANDBY in platform code.
diff --git a/arch/arm/mach-imx/Makefile b/arch/arm/mach-imx/Makefile
index fb689d8..d7a2d1d 100644
--- a/arch/arm/mach-imx/Makefile
+++ b/arch/arm/mach-imx/Makefile
@@ -90,6 +90,7 @@ ifeq ($(CONFIG_SUSPEND),y)
 AFLAGS_suspend-imx6.o :=-Wa,-march=armv7-a
 obj-$(CONFIG_SOC_IMX6) += suspend-imx6.o
 obj-$(CONFIG_SOC_IMX53) += suspend-imx53.o
+obj-$(CONFIG_SOC_LS1021A) += pm-ls1.o
 endif
 obj-$(CONFIG_SOC_IMX6) += pm-imx6.o
 
diff --git a/arch/arm/mach-imx/pm-ls1.c b/arch/arm/mach-imx/pm-ls1.c
new file mode 100644
index 0000000..90775cf
--- /dev/null
+++ b/arch/arm/mach-imx/pm-ls1.c
@@ -0,0 +1,225 @@
+/*
+ * Support Power Management Control for LS1
+ *
+ * Copyright 2015 Freescale Semiconductor Inc.
+ *
+ * This program is free software; you can redistribute	it and/or modify it
+ * under  the terms of	the GNU General	 Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/of_platform.h>
+#include <linux/of_address.h>
+#include <linux/suspend.h>
+
+#include <asm/cacheflush.h>
+#include <asm/suspend.h>
+
+#define FSL_SLEEP			0x1
+#define FSL_DEEP_SLEEP			0x2
+
+#define CCSR_SCFG_CLUSTERPMCR		0x904
+#define CCSR_SCFG_CLUSTERPMCR_WFIL2EN	0x80000000
+#define CCSR_SCFG_CLUSTERPM_ENABLE	1
+#define CCSR_SCFG_CLUSTERPM_DISABLE	0
+
+#define CCSR_RCPM_POWMGTCSR		0x130
+#define CCSR_RCPM_POWMGTCSR_LPM20_REQ	0x00100000
+#define CCSR_RCPM_IPPDEXPCR0		0x140
+#define CCSR_RCPM_IPPDEXPCR1		0x144
+#define CCSR_RCPM_IPPDEXPCR1_OCRAM1	0x10000000
+
+#define SLEEP_ARRAY_SIZE		3
+
+static u32 ippdexpcr0, ippdexpcr1;
+
+struct ls1_pm_baseaddr {
+	void __iomem *rcpm;
+	void __iomem *scfg;
+};
+
+static struct ls1_pm_baseaddr ls1_pm_base;
+
+static inline void ls1_clrsetbits_be32(void __iomem *addr, u32 clear, u32 set)
+{
+	u32 val;
+
+	val = ioread32be(addr);
+	val = (val & ~clear) | set;
+	iowrite32be(val, addr);
+}
+
+static int ls1_pm_iomap(suspend_state_t state)
+{
+	struct device_node *np;
+	void *base;
+
+	np = of_find_compatible_node(NULL, NULL, "fsl,ls1021a-scfg");
+	if (!np) {
+		pr_err("Missing SCFG node in the device tree\n");
+		return -EINVAL;
+	}
+
+	base = of_iomap(np, 0);
+	of_node_put(np);
+	if (!base) {
+		pr_err("Couldn't map SCFG registers\n");
+		return -EINVAL;
+	}
+
+	ls1_pm_base.scfg = base;
+
+	return 0;
+}
+
+static void ls1_pm_uniomap(suspend_state_t state)
+{
+	iounmap(ls1_pm_base.scfg);
+}
+
+/* set IP powerdown exception, make them work during sleep/deep sleep */
+static void ls1_set_powerdown(void)
+{
+	iowrite32be(ippdexpcr0, ls1_pm_base.rcpm + CCSR_RCPM_IPPDEXPCR0);
+	iowrite32be(ippdexpcr1,	ls1_pm_base.rcpm + CCSR_RCPM_IPPDEXPCR1);
+}
+
+static void ls1_set_power_except(struct device *dev, int on)
+{
+	int ret;
+	u32 value[SLEEP_ARRAY_SIZE];
+
+	/*
+	 * Get the values in the "rcpm-wakeup" property. There are three values.
+	 * The first points to the RCPM node, the second is the value of
+	 * the ippdexpcr0 register, and the third is the value of
+	 * the ippdexpcr1 register.
+	 */
+	ret = of_property_read_u32_array(dev->of_node, "rcpm-wakeup",
+					 value, SLEEP_ARRAY_SIZE);
+	if (ret) {
+		dev_err(dev, "%s: Can not find the \"sleep\" property.\n",
+			__func__);
+		return;
+	}
+
+	ippdexpcr0 |= value[1];
+	ippdexpcr1 |= value[2];
+
+	pr_debug("%s: set %s as a wakeup source", __func__,
+		 dev->of_node->full_name);
+}
+
+static void ls1_set_wakeup_device(struct device *dev, void *enable)
+{
+	/* set each device which can act as wakeup source */
+	if (device_may_wakeup(dev))
+		ls1_set_power_except(dev, *((int *)enable));
+}
+
+/* enable cluster to enter the PCL10 state */
+static void ls1_set_clusterpm(int enable)
+{
+	u32 val = 0;
+
+	if (enable)
+		val = CCSR_SCFG_CLUSTERPMCR_WFIL2EN;
+
+	iowrite32be(val, ls1_pm_base.scfg + CCSR_SCFG_CLUSTERPMCR);
+}
+
+static int ls1_suspend_enter(suspend_state_t state)
+{
+	int ret = 0;
+
+	ls1_set_powerdown();
+	ls1_set_clusterpm(CCSR_SCFG_CLUSTERPM_ENABLE);
+
+	switch (state) {
+	case PM_SUSPEND_STANDBY:
+		flush_cache_louis();
+		ls1_clrsetbits_be32(ls1_pm_base.rcpm + CCSR_RCPM_POWMGTCSR,
+				    CCSR_RCPM_POWMGTCSR_LPM20_REQ,
+				    CCSR_RCPM_POWMGTCSR_LPM20_REQ);
+		cpu_do_idle();
+		break;
+	case PM_SUSPEND_MEM:
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	ls1_set_clusterpm(CCSR_SCFG_CLUSTERPM_DISABLE);
+
+	return ret;
+}
+
+static int ls1_suspend_valid(suspend_state_t state)
+{
+	if (state == PM_SUSPEND_STANDBY)
+		return 1;
+
+	return 0;
+}
+
+static int ls1_suspend_begin(suspend_state_t state)
+{
+	int res = -EINVAL;
+
+	ippdexpcr0 = 0;
+	ippdexpcr1 = 0;
+
+	if (state == PM_SUSPEND_STANDBY)
+		res = ls1_pm_iomap(state);
+
+	if (!res)
+		dpm_for_each_dev(NULL, ls1_set_wakeup_device);
+
+	return res;
+}
+
+static void ls1_suspend_end(void)
+{
+	ls1_pm_uniomap(PM_SUSPEND_STANDBY);
+}
+
+static const struct platform_suspend_ops ls1_suspend_ops = {
+	.valid = ls1_suspend_valid,
+	.enter = ls1_suspend_enter,
+	.begin = ls1_suspend_begin,
+	.end = ls1_suspend_end,
+};
+
+static const struct of_device_id rcpm_matches[] = {
+	{
+		.compatible = "fsl,ls1021a-rcpm",
+	},
+	{}
+};
+
+static int __init ls1_pm_init(void)
+{
+	const struct of_device_id *match;
+	struct device_node *np;
+
+	np = of_find_matching_node_and_match(NULL, rcpm_matches, &match);
+	if (!np) {
+		pr_err("%s: can't find the rcpm node.\n", __func__);
+		return -EINVAL;
+	}
+
+	ls1_pm_base.rcpm = of_iomap(np, 0);
+	of_node_put(np);
+	if (!ls1_pm_base.rcpm)
+		return -ENOMEM;
+
+	suspend_set_ops(&ls1_suspend_ops);
+
+	pr_info("Freescale Power Management Control Registered\n");
+
+	return 0;
+}
+arch_initcall(ls1_pm_init);
-- 
2.1.0.27.g96db324