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Message-ID: <1442308030-21231-1-git-send-email-dongsheng.wang@freescale.com>
Date: Tue, 15 Sep 2015 17:07:10 +0800
From: Dongsheng Wang <dongsheng.wang@...escale.com>
To: <shawnguo@...nel.org>
CC: <mark.rutland@....com>, <alison.wang@...escale.com>,
<jason.jin@...escale.com>, <linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>,
Wang Dongsheng <dongsheng.wang@...escale.com>,
Chenhui Zhao <chenhui.zhao@...escale.com>
Subject: [PATCH v2] arm/ls1021a: Add Sleep feature for ls1021
From: Wang Dongsheng <dongsheng.wang@...escale.com>
Add system STANDBY implement for ls1021 platform.
Signed-off-by: Chenhui Zhao <chenhui.zhao@...escale.com>
Signed-off-by: Wang Dongsheng <dongsheng.wang@...escale.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
--
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