Patchwork [v2,09/15] powerpc/rcpm: add sleep feature for SoCs using RCPM

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Submitter chenhui zhao
Date April 19, 2013, 10:47 a.m.
Message ID <1366368468-29143-9-git-send-email-chenhui.zhao@freescale.com>
Download mbox | patch
Permalink /patch/237908/
State Not Applicable
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Comments

chenhui zhao - April 19, 2013, 10:47 a.m.
The SoCs which have a RCPM (Run Control/Power Management) module
support power management feature. This patch implements sleep feature.

In sleep mode, the clocks of cores and unused IP blocks will be
turned off. The IP blocks which are allowed to wake up the system
are still running.

Signed-off-by: Zhao Chenhui <chenhui.zhao@freescale.com>
Signed-off-by: Li Yang <leoli@freescale.com>
---
 arch/powerpc/Kconfig                |    4 +-
 arch/powerpc/include/asm/fsl_guts.h |    1 +
 arch/powerpc/platforms/85xx/Kconfig |    1 +
 arch/powerpc/sysdev/Kconfig         |    5 ++
 arch/powerpc/sysdev/Makefile        |    1 +
 arch/powerpc/sysdev/fsl_rcpm.c      |  101 +++++++++++++++++++++++++++++++++++
 6 files changed, 111 insertions(+), 2 deletions(-)
 create mode 100644 arch/powerpc/sysdev/fsl_rcpm.c

Patch

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index b6851be..0ad6e30 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -220,7 +220,7 @@  config ARCH_HIBERNATION_POSSIBLE
 config ARCH_SUSPEND_POSSIBLE
 	def_bool y
 	depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
-		   (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
+		   FSL_SOC_BOOKE || PPC_86xx || PPC_PSERIES \
 		   || 44x || 40x
 
 config PPC_DCR_NATIVE
@@ -694,7 +694,7 @@  config FSL_PCI
 config FSL_PMC
 	bool
 	default y
-	depends on SUSPEND && (PPC_85xx || PPC_86xx)
+	depends on SUSPEND && ((PPC_85xx && !PPC_E500MC) || PPC_86xx)
 	help
 	  Freescale MPC85xx/MPC86xx power management controller support
 	  (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
diff --git a/arch/powerpc/include/asm/fsl_guts.h b/arch/powerpc/include/asm/fsl_guts.h
index 4eac1cf..b8a08d5 100644
--- a/arch/powerpc/include/asm/fsl_guts.h
+++ b/arch/powerpc/include/asm/fsl_guts.h
@@ -124,6 +124,7 @@  struct ccsr_rcpm {
 	u8	res0038[4];
 	__be32	cwdtdsr;	/* 0x003c - Core watchdog detect status register */
 	__be32	powmgtcsr;	/* 0x0040 - Power Mangement Control & Status Register */
+#define RCPM_POWMGTCSR_SLP	0x00020000
 	u8	res0044[12];
 	__be32	ippdexpcr;	/* 0x0050 - IP Powerdown Exception Control Register */
 	u8	res0054[16];
diff --git a/arch/powerpc/platforms/85xx/Kconfig b/arch/powerpc/platforms/85xx/Kconfig
index 8f02b05..c0aa36e 100644
--- a/arch/powerpc/platforms/85xx/Kconfig
+++ b/arch/powerpc/platforms/85xx/Kconfig
@@ -8,6 +8,7 @@  menuconfig FSL_SOC_BOOKE
 	select FSL_PCI if PCI
 	select SERIAL_8250_EXTENDED if SERIAL_8250
 	select SERIAL_8250_SHARE_IRQ if SERIAL_8250
+	select FSL_CORENET_RCPM if SUSPEND && PPC_E500MC
 	default y
 
 if FSL_SOC_BOOKE
diff --git a/arch/powerpc/sysdev/Kconfig b/arch/powerpc/sysdev/Kconfig
index a84fecf..6c22d91 100644
--- a/arch/powerpc/sysdev/Kconfig
+++ b/arch/powerpc/sysdev/Kconfig
@@ -33,3 +33,8 @@  config SCOM_DEBUGFS
 config GE_FPGA
 	bool
 	default n
+
+config FSL_CORENET_RCPM
+	bool
+	help
+	 This option enables support for RCPM (Run Control/Power Management).
diff --git a/arch/powerpc/sysdev/Makefile b/arch/powerpc/sysdev/Makefile
index b0a518e..f12b856 100644
--- a/arch/powerpc/sysdev/Makefile
+++ b/arch/powerpc/sysdev/Makefile
@@ -18,6 +18,7 @@  obj-$(CONFIG_MMIO_NVRAM)	+= mmio_nvram.o
 obj-$(CONFIG_FSL_SOC)		+= fsl_soc.o fsl_mpic_err.o
 obj-$(CONFIG_FSL_PCI)		+= fsl_pci.o $(fsl-msi-obj-y)
 obj-$(CONFIG_FSL_PMC)		+= fsl_pmc.o
+obj-$(CONFIG_FSL_CORENET_RCPM)	+= fsl_rcpm.o
 obj-$(CONFIG_FSL_LBC)		+= fsl_lbc.o
 obj-$(CONFIG_FSL_IFC)		+= fsl_ifc.o
 obj-$(CONFIG_FSL_GTM)		+= fsl_gtm.o
diff --git a/arch/powerpc/sysdev/fsl_rcpm.c b/arch/powerpc/sysdev/fsl_rcpm.c
new file mode 100644
index 0000000..fd789da
--- /dev/null
+++ b/arch/powerpc/sysdev/fsl_rcpm.c
@@ -0,0 +1,101 @@ 
+/*
+ * RCPM(Run Control/Power Management) support
+ *
+ * Copyright 2012-2013 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/types.h>
+#include <linux/errno.h>
+#include <linux/suspend.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/of_platform.h>
+
+#include <asm/io.h>
+#include <asm/cacheflush.h>
+#include <asm/fsl_guts.h>
+
+static struct ccsr_rcpm __iomem *rcpm_regs;
+
+static int rcpm_suspend_enter(suspend_state_t state)
+{
+	int ret = 0;
+
+	switch (state) {
+	case PM_SUSPEND_STANDBY:
+
+		flush_dcache_L1();
+		flush_backside_L2_cache();
+
+		setbits32(&rcpm_regs->powmgtcsr, RCPM_POWMGTCSR_SLP);
+
+		/* At this point, the device is in sleep mode. */
+
+		/* Upon resume, wait for SLP bit to be clear. */
+		ret = spin_event_timeout(
+		  (in_be32(&rcpm_regs->powmgtcsr) & RCPM_POWMGTCSR_SLP) == 0,
+		  10000, 10);
+		if (!ret) {
+			pr_err("%s: timeout waiting for SLP bit to be cleared\n",
+				__func__);
+			ret = -EINVAL;
+		}
+		break;
+
+	default:
+		ret = -EINVAL;
+
+	}
+	return ret;
+}
+
+static int rcpm_suspend_valid(suspend_state_t state)
+{
+	if (state == PM_SUSPEND_STANDBY)
+		return 1;
+	else
+		return 0;
+}
+
+static const struct platform_suspend_ops rcpm_suspend_ops = {
+	.valid = rcpm_suspend_valid,
+	.enter = rcpm_suspend_enter,
+};
+
+static int rcpm_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+
+	rcpm_regs = of_iomap(np, 0);
+	if (!rcpm_regs)
+		return -ENOMEM;
+
+	suspend_set_ops(&rcpm_suspend_ops);
+
+	dev_info(&pdev->dev, "Freescale RCPM driver\n");
+	return 0;
+}
+
+static const struct of_device_id rcpm_ids[] = {
+	{ .compatible = "fsl,qoriq-rcpm-1.0", },
+	{ },
+};
+
+static struct platform_driver rcpm_driver = {
+	.driver = {
+		.name = "fsl-rcpm",
+		.of_match_table = rcpm_ids,
+	},
+	.probe = rcpm_probe,
+};
+
+static int __init rcpm_init(void)
+{
+	return platform_driver_register(&rcpm_driver);
+}
+
+device_initcall(rcpm_init);