Message-ID: <1440590988-25594-2-git-send-email-chenhui.zhao@freescale.com>
Date:	Wed, 26 Aug 2015 20:09:45 +0800
From:	Chenhui Zhao <chenhui.zhao@...escale.com>
To:	<linuxppc-dev@...ts.ozlabs.org>, <scottwood@...escale.com>
CC:	<linux-kernel@...r.kernel.org>, <Jason.Jin@...escale.com>
Subject: [PATCH v2,2/5] powerpc/rcpm: add RCPM driver

There is a RCPM (Run Control/Power Management) in Freescale QorIQ
series processors. The device performs tasks associated with device
run control and power management.

The driver implements some features: mask/unmask irq, enter/exit low
power states, freeze time base, etc.

Signed-off-by: Chenhui Zhao <chenhui.zhao@...escale.com>
Signed-off-by: Tang Yuantian <Yuantian.Tang@...escale.com>
---
major changes for v2:
* rcpm_v1_cpu_die() and rcpm_v2_cpu_die() will be executed by the dying cpu.
  this way, more stable

 Documentation/devicetree/bindings/soc/fsl/rcpm.txt |  44 +++
 arch/powerpc/include/asm/fsl_guts.h                | 105 ++++++
 arch/powerpc/include/asm/fsl_pm.h                  |  50 +++
 arch/powerpc/platforms/85xx/Kconfig                |   1 +
 arch/powerpc/platforms/85xx/common.c               |   3 +
 arch/powerpc/sysdev/Kconfig                        |   5 +
 arch/powerpc/sysdev/Makefile                       |   1 +
 arch/powerpc/sysdev/fsl_rcpm.c                     | 390 +++++++++++++++++++++
 8 files changed, 599 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/soc/fsl/rcpm.txt
 create mode 100644 arch/powerpc/include/asm/fsl_pm.h
 create mode 100644 arch/powerpc/sysdev/fsl_rcpm.c

diff --git a/Documentation/devicetree/bindings/soc/fsl/rcpm.txt b/Documentation/devicetree/bindings/soc/fsl/rcpm.txt
new file mode 100644
index 0000000..dc52f70
--- /dev/null
+++ b/Documentation/devicetree/bindings/soc/fsl/rcpm.txt
@@ -0,0 +1,44 @@
+* Run Control and Power Management
+
+The RCPM performs all device-level tasks associated with device run control
+and power management.
+
+Required properites:
+  - reg : Offset and length of the register set of RCPM block.
+  - compatible : Sould contain a chip-specific RCPM block compatible string
+	and (if applicable) may contain a chassis-version RCPM compatible string.
+	Chip-specific strings are of the form "fsl,<chip>-rcpm", such as:
+	* "fsl,p2041-rcpm"
+	* "fsl,p3041-rcpm"
+	* "fsl,p4080-rcpm"
+	* "fsl,p5020-rcpm"
+	* "fsl,p5040-rcpm"
+	* "fsl,t4240-rcpm"
+	* "fsl,b4420-rcpm"
+	* "fsl,b4860-rcpm"
+
+	Chassis-version RCPM strings include:
+	* "fsl,qoriq-rcpm-1.0": for chassis 1.0 rcpm
+	* "fsl,qoriq-rcpm-2.0": for chassis 2.0 rcpm
+	* "fsl,qoriq-rcpm-2.1": for chassis 2.1 rcpm
+
+All references to "1.0" and "2.0" refer to the QorIQ chassis version to
+which the chip complies.
+Chassis Version		Example Chips
+---------------		-------------------------------
+1.0					p4080, p5020, p5040, p2041, p3041
+2.0					t4240, b4860, b4420
+2.1					t1040
+
+Example:
+The RCPM node for T4240:
+	rcpm: global-utilities@...00 {
+		compatible = "fsl,t4240-rcpm", "fsl,qoriq-rcpm-2.0";
+		reg = <0xe2000 0x1000>;
+	};
+
+The RCPM node for P4080:
+	rcpm: global-utilities@...00 {
+		compatible = "fsl,qoriq-rcpm-1.0";
+		reg = <0xe2000 0x1000>;
+	};
diff --git a/arch/powerpc/include/asm/fsl_guts.h b/arch/powerpc/include/asm/fsl_guts.h
index 43b6bb1..a67413c 100644
--- a/arch/powerpc/include/asm/fsl_guts.h
+++ b/arch/powerpc/include/asm/fsl_guts.h
@@ -188,5 +188,110 @@ static inline void guts_set_pmuxcr_dma(struct ccsr_guts __iomem *guts,
 
 #endif
 
+struct ccsr_rcpm_v1 {
+	u8	res0000[4];
+	__be32	cdozsr;	    /* 0x0004 Core Doze Status Register */
+	u8	res0008[4];
+	__be32	cdozcr;	    /* 0x000c Core Doze Control Register */
+	u8	res0010[4];
+	__be32	cnapsr;	    /* 0x0014 Core Nap Status Register */
+	u8	res0018[4];
+	__be32	cnapcr;	    /* 0x001c Core Nap Control Register */
+	u8	res0020[4];
+	__be32	cdozpsr;    /* 0x0024 Core Doze Previous Status Register */
+	u8	res0028[4];
+	__be32	cnappsr;    /* 0x002c Core Nap Previous Status Register */
+	u8	res0030[4];
+	__be32	cwaitsr;    /* 0x0034 Core Wait Status Register */
+	u8	res0038[4];
+	__be32	cwdtdsr;    /* 0x003c Core Watchdog Detect Status Register */
+	__be32	powmgtcsr;  /* 0x0040 PM Control&Status Register */
+#define RCPM_POWMGTCSR_SLP	0x00020000
+	u8	res0044[12];
+	__be32	ippdexpcr;  /* 0x0050 IP Powerdown Exception Control Register */
+	u8	res0054[16];
+	__be32	cpmimr;	    /* 0x0064 Core PM IRQ Mask Register */
+	u8	res0068[4];
+	__be32	cpmcimr;    /* 0x006c Core PM Critical IRQ Mask Register */
+	u8	res0070[4];
+	__be32	cpmmcmr;    /* 0x0074 Core PM Machine Check Mask Register */
+	u8	res0078[4];
+	__be32	cpmnmimr;   /* 0x007c Core PM NMI Mask Register */
+	u8	res0080[4];
+	__be32	ctbenr;	    /* 0x0084 Core Time Base Enable Register */
+	u8	res0088[4];
+	__be32	ctbckselr;  /* 0x008c Core Time Base Clock Select Register */
+	u8	res0090[4];
+	__be32	ctbhltcr;   /* 0x0094 Core Time Base Halt Control Register */
+	u8	res0098[4];
+	__be32	cmcpmaskcr; /* 0x00a4 Core Machine Check Mask Register */
+};
+
+struct ccsr_rcpm_v2 {
+	u8	res_00[12];
+	__be32	tph10sr0;	/* Thread PH10 Status Register */
+	u8	res_10[12];
+	__be32	tph10setr0;	/* Thread PH10 Set Control Register */
+	u8	res_20[12];
+	__be32	tph10clrr0;	/* Thread PH10 Clear Control Register */
+	u8	res_30[12];
+	__be32	tph10psr0;	/* Thread PH10 Previous Status Register */
+	u8	res_40[12];
+	__be32	twaitsr0;	/* Thread Wait Status Register */
+	u8	res_50[96];
+	__be32	pcph15sr;	/* Physical Core PH15 Status Register */
+	__be32	pcph15setr;	/* Physical Core PH15 Set Control Register */
+	__be32	pcph15clrr;	/* Physical Core PH15 Clear Control Register */
+	__be32	pcph15psr;	/* Physical Core PH15 Prev Status Register */
+	u8	res_c0[16];
+	__be32	pcph20sr;	/* Physical Core PH20 Status Register */
+	__be32	pcph20setr;	/* Physical Core PH20 Set Control Register */
+	__be32	pcph20clrr;	/* Physical Core PH20 Clear Control Register */
+	__be32	pcph20psr;	/* Physical Core PH20 Prev Status Register */
+	__be32	pcpw20sr;	/* Physical Core PW20 Status Register */
+	u8	res_e0[12];
+	__be32	pcph30sr;	/* Physical Core PH30 Status Register */
+	__be32	pcph30setr;	/* Physical Core PH30 Set Control Register */
+	__be32	pcph30clrr;	/* Physical Core PH30 Clear Control Register */
+	__be32	pcph30psr;	/* Physical Core PH30 Prev Status Register */
+	u8	res_100[32];
+	__be32	ippwrgatecr;	/* IP Power Gating Control Register */
+	u8	res_124[12];
+	__be32	powmgtcsr;	/* Power Management Control & Status Reg */
+#define RCPM_POWMGTCSR_LPM20_RQ		0x00100000
+#define RCPM_POWMGTCSR_LPM20_ST		0x00000200
+#define RCPM_POWMGTCSR_P_LPM20_ST	0x00000100
+	u8	res_134[12];
+	__be32	ippdexpcr[4];	/* IP Powerdown Exception Control Reg */
+	u8	res_150[12];
+	__be32	tpmimr0;	/* Thread PM Interrupt Mask Reg */
+	u8	res_160[12];
+	__be32	tpmcimr0;	/* Thread PM Crit Interrupt Mask Reg */
+	u8	res_170[12];
+	__be32	tpmmcmr0;	/* Thread PM Machine Check Interrupt Mask Reg */
+	u8	res_180[12];
+	__be32	tpmnmimr0;	/* Thread PM NMI Mask Reg */
+	u8	res_190[12];
+	__be32	tmcpmaskcr0;	/* Thread Machine Check Mask Control Reg */
+	__be32	pctbenr;	/* Physical Core Time Base Enable Reg */
+	__be32	pctbclkselr;	/* Physical Core Time Base Clock Select */
+	__be32	tbclkdivr;	/* Time Base Clock Divider Register */
+	u8	res_1ac[4];
+	__be32	ttbhltcr[4];	/* Thread Time Base Halt Control Register */
+	__be32	clpcl10sr;	/* Cluster PCL10 Status Register */
+	__be32	clpcl10setr;	/* Cluster PCL30 Set Control Register */
+	__be32	clpcl10clrr;	/* Cluster PCL30 Clear Control Register */
+	__be32	clpcl10psr;	/* Cluster PCL30 Prev Status Register */
+	__be32	cddslpsetr;	/* Core Domain Deep Sleep Set Register */
+	__be32	cddslpclrr;	/* Core Domain Deep Sleep Clear Register */
+	__be32	cdpwroksetr;	/* Core Domain Power OK Set Register */
+	__be32	cdpwrokclrr;	/* Core Domain Power OK Clear Register */
+	__be32	cdpwrensr;	/* Core Domain Power Enable Status Register */
+	__be32	cddslsr;	/* Core Domain Deep Sleep Status Register */
+	u8	res_1e8[8];
+	__be32	dslpcntcr[8];	/* Deep Sleep Counter Cfg Register */
+	u8	res_300[3568];
+};
+
 #endif
 #endif
diff --git a/arch/powerpc/include/asm/fsl_pm.h b/arch/powerpc/include/asm/fsl_pm.h
new file mode 100644
index 0000000..3a36622
--- /dev/null
+++ b/arch/powerpc/include/asm/fsl_pm.h
@@ -0,0 +1,50 @@
+/*
+ * Support Power Management
+ *
+ * Copyright 2014-2015 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.
+ */
+#ifndef __PPC_FSL_PM_H
+#define __PPC_FSL_PM_H
+#ifdef __KERNEL__
+
+#define E500_PM_PH10	1
+#define E500_PM_PH15	2
+#define E500_PM_PH20	3
+#define E500_PM_PH30	4
+#define E500_PM_DOZE	E500_PM_PH10
+#define E500_PM_NAP	E500_PM_PH15
+
+#define PLAT_PM_SLEEP	20
+#define PLAT_PM_LPM20	30
+
+#define FSL_PM_SLEEP		(1 << 0)
+#define FSL_PM_DEEP_SLEEP	(1 << 1)
+
+struct fsl_pm_ops {
+	/* mask pending interrupts to the RCPM from MPIC */
+	void (*irq_mask)(int cpu);
+
+	/* unmask pending interrupts to the RCPM from MPIC */
+	void (*irq_unmask)(int cpu);
+	void (*cpu_enter_state)(int cpu, int state);
+	void (*cpu_exit_state)(int cpu, int state);
+	void (*cpu_up_prepare)(int cpu);
+	void (*cpu_die)(int cpu);
+	int (*plat_enter_sleep)(void);
+	void (*freeze_time_base)(bool freeze);
+
+	/* keep the power of IP blocks during sleep/deep sleep */
+	void (*set_ip_power)(bool enable, u32 mask);
+
+	/* get platform supported power management modes */
+	unsigned int (*get_pm_modes)(void);
+};
+
+extern const struct fsl_pm_ops *qoriq_pm_ops;
+#endif /* __KERNEL__ */
+#endif /* __PPC_FSL_PM_H */
diff --git a/arch/powerpc/platforms/85xx/Kconfig b/arch/powerpc/platforms/85xx/Kconfig
index 97915fe..e626461 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 PPC_E500MC
 	default y
 
 if FSL_SOC_BOOKE
diff --git a/arch/powerpc/platforms/85xx/common.c b/arch/powerpc/platforms/85xx/common.c
index 7bfb9b1..91475f5 100644
--- a/arch/powerpc/platforms/85xx/common.c
+++ b/arch/powerpc/platforms/85xx/common.c
@@ -10,10 +10,13 @@
 #include <linux/of_platform.h>
 
 #include <asm/qe.h>
+#include <asm/fsl_pm.h>
 #include <sysdev/cpm2_pic.h>
 
 #include "mpc85xx.h"
 
+const struct fsl_pm_ops *qoriq_pm_ops;
+
 static const struct of_device_id mpc85xx_common_ids[] __initconst = {
 	{ .type = "soc", },
 	{ .compatible = "soc", },
diff --git a/arch/powerpc/sysdev/Kconfig b/arch/powerpc/sysdev/Kconfig
index a19332a..52dc165 100644
--- a/arch/powerpc/sysdev/Kconfig
+++ b/arch/powerpc/sysdev/Kconfig
@@ -40,3 +40,8 @@ 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 5b492a6..d0e8a43 100644
--- a/arch/powerpc/sysdev/Makefile
+++ b/arch/powerpc/sysdev/Makefile
@@ -20,6 +20,7 @@ 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-$(CONFIG_FSL_GTM)		+= fsl_gtm.o
 obj-$(CONFIG_FSL_85XX_CACHE_SRAM)	+= fsl_85xx_l2ctlr.o fsl_85xx_cache_sram.o
diff --git a/arch/powerpc/sysdev/fsl_rcpm.c b/arch/powerpc/sysdev/fsl_rcpm.c
new file mode 100644
index 0000000..ed59881
--- /dev/null
+++ b/arch/powerpc/sysdev/fsl_rcpm.c
@@ -0,0 +1,390 @@
+/*
+ * RCPM(Run Control/Power Management) support
+ *
+ * Copyright 2012-2015 Freescale Semiconductor Inc.
+ *
+ * Author: Chenhui Zhao <chenhui.zhao@...escale.com>
+ *
+ * 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.
+ */
+
+#define pr_fmt(fmt) "%s: " fmt, __func__
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/of_address.h>
+#include <linux/export.h>
+
+#include <asm/io.h>
+#include <asm/fsl_guts.h>
+#include <asm/cputhreads.h>
+#include <asm/fsl_pm.h>
+
+static struct ccsr_rcpm_v1 __iomem *rcpm_v1_regs;
+static struct ccsr_rcpm_v2 __iomem *rcpm_v2_regs;
+static unsigned int fsl_supported_pm_modes;
+
+static void rcpm_v1_irq_mask(int cpu)
+{
+	int hw_cpu = get_hard_smp_processor_id(cpu);
+	unsigned int mask = 1 << hw_cpu;
+
+	setbits32(&rcpm_v1_regs->cpmimr, mask);
+	setbits32(&rcpm_v1_regs->cpmcimr, mask);
+	setbits32(&rcpm_v1_regs->cpmmcmr, mask);
+	setbits32(&rcpm_v1_regs->cpmnmimr, mask);
+}
+
+static void rcpm_v2_irq_mask(int cpu)
+{
+	int hw_cpu = get_hard_smp_processor_id(cpu);
+	unsigned int mask = 1 << hw_cpu;
+
+	setbits32(&rcpm_v2_regs->tpmimr0, mask);
+	setbits32(&rcpm_v2_regs->tpmcimr0, mask);
+	setbits32(&rcpm_v2_regs->tpmmcmr0, mask);
+	setbits32(&rcpm_v2_regs->tpmnmimr0, mask);
+}
+
+static void rcpm_v1_irq_unmask(int cpu)
+{
+	int hw_cpu = get_hard_smp_processor_id(cpu);
+	unsigned int mask = 1 << hw_cpu;
+
+	clrbits32(&rcpm_v1_regs->cpmimr, mask);
+	clrbits32(&rcpm_v1_regs->cpmcimr, mask);
+	clrbits32(&rcpm_v1_regs->cpmmcmr, mask);
+	clrbits32(&rcpm_v1_regs->cpmnmimr, mask);
+}
+
+static void rcpm_v2_irq_unmask(int cpu)
+{
+	int hw_cpu = get_hard_smp_processor_id(cpu);
+	unsigned int mask = 1 << hw_cpu;
+
+	clrbits32(&rcpm_v2_regs->tpmimr0, mask);
+	clrbits32(&rcpm_v2_regs->tpmcimr0, mask);
+	clrbits32(&rcpm_v2_regs->tpmmcmr0, mask);
+	clrbits32(&rcpm_v2_regs->tpmnmimr0, mask);
+}
+
+static void rcpm_v1_set_ip_power(bool enable, u32 mask)
+{
+	if (enable)
+		setbits32(&rcpm_v1_regs->ippdexpcr, mask);
+	else
+		clrbits32(&rcpm_v1_regs->ippdexpcr, mask);
+}
+
+static void rcpm_v2_set_ip_power(bool enable, u32 mask)
+{
+	if (enable)
+		setbits32(&rcpm_v2_regs->ippdexpcr[0], mask);
+	else
+		clrbits32(&rcpm_v2_regs->ippdexpcr[0], mask);
+}
+
+static void rcpm_v1_cpu_enter_state(int cpu, int state)
+{
+	int hw_cpu = get_hard_smp_processor_id(cpu);
+	unsigned int mask = 1 << hw_cpu;
+
+	switch (state) {
+	case E500_PM_PH10:
+		setbits32(&rcpm_v1_regs->cdozcr, mask);
+		break;
+	case E500_PM_PH15:
+		setbits32(&rcpm_v1_regs->cnapcr, mask);
+		break;
+	default:
+		pr_warn("Unknown cpu PM state (%d)\n", state);
+		break;
+	}
+}
+
+static void rcpm_v2_cpu_enter_state(int cpu, int state)
+{
+	int hw_cpu = get_hard_smp_processor_id(cpu);
+	u32 mask = 1 << cpu_core_index_of_thread(hw_cpu);
+
+	switch (state) {
+	case E500_PM_PH10:
+		/* one bit corresponds to one thread for PH10 of 6500 */
+		setbits32(&rcpm_v2_regs->tph10setr0, 1 << hw_cpu);
+		break;
+	case E500_PM_PH15:
+		setbits32(&rcpm_v2_regs->pcph15setr, mask);
+		break;
+	case E500_PM_PH20:
+		setbits32(&rcpm_v2_regs->pcph20setr, mask);
+		break;
+	case E500_PM_PH30:
+		setbits32(&rcpm_v2_regs->pcph30setr, mask);
+		break;
+	default:
+		pr_warn("Unknown cpu PM state (%d)\n", state);
+	}
+}
+
+static void rcpm_v1_cpu_die(int cpu)
+{
+	rcpm_v1_cpu_enter_state(cpu, E500_PM_PH15);
+}
+
+#ifdef CONFIG_PPC_BOOK3E
+static void qoriq_disable_thread(int cpu)
+{
+	int hw_cpu = get_hard_smp_processor_id(cpu);
+	int thread = cpu_thread_in_core(hw_cpu);
+
+	mtspr(SPRN_TENC, TEN_THREAD(thread));
+}
+#endif
+
+static void rcpm_v2_cpu_die(int cpu)
+{
+#ifdef CONFIG_PPC_BOOK3E
+	int primary;
+
+	if (threads_per_core == 2) {
+		primary = cpu_first_thread_sibling(cpu);
+		if (cpu_is_offline(primary) && cpu_is_offline(primary + 1)) {
+			/* if both threads are offline, put the cpu in PH20 */
+			rcpm_v2_cpu_enter_state(cpu, E500_PM_PH20);
+		} else {
+			/* if only one thread is offline, disable the thread */
+			qoriq_disable_thread(cpu);
+		}
+	}
+#endif
+
+	if (threads_per_core == 1) {
+		rcpm_v2_cpu_enter_state(cpu, E500_PM_PH20);
+		return;
+	}
+}
+
+static void rcpm_v1_cpu_exit_state(int cpu, int state)
+{
+	int hw_cpu = get_hard_smp_processor_id(cpu);
+	unsigned int mask = 1 << hw_cpu;
+
+	switch (state) {
+	case E500_PM_PH10:
+		clrbits32(&rcpm_v1_regs->cdozcr, mask);
+		break;
+	case E500_PM_PH15:
+		clrbits32(&rcpm_v1_regs->cnapcr, mask);
+		break;
+	default:
+		pr_warn("Unknown cpu PM state (%d)\n", state);
+		break;
+	}
+}
+
+static void rcpm_v1_cpu_up_prepare(int cpu)
+{
+	rcpm_v1_cpu_exit_state(cpu, E500_PM_PH15);
+	rcpm_v1_irq_unmask(cpu);
+}
+
+static void rcpm_v2_cpu_exit_state(int cpu, int state)
+{
+	int hw_cpu = get_hard_smp_processor_id(cpu);
+	u32 mask = 1 << cpu_core_index_of_thread(hw_cpu);
+
+	switch (state) {
+	case E500_PM_PH10:
+		setbits32(&rcpm_v2_regs->tph10clrr0, 1 << hw_cpu);
+		break;
+	case E500_PM_PH15:
+		setbits32(&rcpm_v2_regs->pcph15clrr, mask);
+		break;
+	case E500_PM_PH20:
+		setbits32(&rcpm_v2_regs->pcph20clrr, mask);
+		break;
+	case E500_PM_PH30:
+		setbits32(&rcpm_v2_regs->pcph30clrr, mask);
+		break;
+	default:
+		pr_warn("Unknown cpu PM state (%d)\n", state);
+	}
+}
+
+static void rcpm_v2_cpu_up_prepare(int cpu)
+{
+	rcpm_v2_cpu_exit_state(cpu, E500_PM_PH20);
+	rcpm_v2_irq_unmask(cpu);
+}
+
+static int rcpm_v1_plat_enter_state(int state)
+{
+	u32 *pmcsr_reg = &rcpm_v1_regs->powmgtcsr;
+	int ret = 0;
+	int result;
+
+	switch (state) {
+	case PLAT_PM_SLEEP:
+		setbits32(pmcsr_reg, RCPM_POWMGTCSR_SLP);
+
+		/* Upon resume, wait for RCPM_POWMGTCSR_SLP bit to be clear. */
+		result = spin_event_timeout(
+		  !(in_be32(pmcsr_reg) & RCPM_POWMGTCSR_SLP), 10000, 10);
+		if (!result) {
+			pr_err("timeout waiting for SLP bit to be cleared\n");
+			ret = -ETIMEDOUT;
+		}
+		break;
+	default:
+		pr_warn("Unknown platform PM state (%d)", state);
+		ret = -EINVAL;
+	}
+
+	return ret;
+}
+
+static int rcpm_v2_plat_enter_state(int state)
+{
+	u32 *pmcsr_reg = &rcpm_v2_regs->powmgtcsr;
+	int ret = 0;
+	int result;
+
+	switch (state) {
+	case PLAT_PM_LPM20:
+		/* clear previous LPM20 status */
+		setbits32(pmcsr_reg, RCPM_POWMGTCSR_P_LPM20_ST);
+		/* enter LPM20 status */
+		setbits32(pmcsr_reg, RCPM_POWMGTCSR_LPM20_RQ);
+
+		/* At this point, the device is in LPM20 status. */
+
+		/* resume ... */
+		result = spin_event_timeout(
+		  !(in_be32(pmcsr_reg) & RCPM_POWMGTCSR_LPM20_ST), 10000, 10);
+		if (!result) {
+			pr_err("timeout waiting for LPM20 bit to be cleared\n");
+			ret = -ETIMEDOUT;
+		}
+		break;
+	default:
+		pr_warn("Unknown platform PM state (%d)\n", state);
+		ret = -EINVAL;
+	}
+
+	return ret;
+}
+
+static int rcpm_v1_plat_enter_sleep(void)
+{
+	return rcpm_v1_plat_enter_state(PLAT_PM_SLEEP);
+}
+
+static int rcpm_v2_plat_enter_sleep(void)
+{
+	return rcpm_v2_plat_enter_state(PLAT_PM_LPM20);
+}
+
+static void rcpm_common_freeze_time_base(u32 *tben_reg, int freeze)
+{
+	static u32 mask;
+
+	if (freeze) {
+		mask = in_be32(tben_reg);
+		clrbits32(tben_reg, mask);
+	} else {
+		setbits32(tben_reg, mask);
+	}
+
+	/* read back to push the previous write */
+	in_be32(tben_reg);
+}
+
+static void rcpm_v1_freeze_time_base(bool freeze)
+{
+	rcpm_common_freeze_time_base(&rcpm_v1_regs->ctbenr, freeze);
+}
+
+static void rcpm_v2_freeze_time_base(bool freeze)
+{
+	rcpm_common_freeze_time_base(&rcpm_v2_regs->pctbenr, freeze);
+}
+
+static unsigned int rcpm_get_pm_modes(void)
+{
+	return fsl_supported_pm_modes;
+}
+
+static const struct fsl_pm_ops qoriq_rcpm_v1_ops = {
+	.irq_mask = rcpm_v1_irq_mask,
+	.irq_unmask = rcpm_v1_irq_unmask,
+	.cpu_enter_state = rcpm_v1_cpu_enter_state,
+	.cpu_exit_state = rcpm_v1_cpu_exit_state,
+	.cpu_up_prepare = rcpm_v1_cpu_up_prepare,
+	.cpu_die = rcpm_v1_cpu_die,
+	.plat_enter_sleep = rcpm_v1_plat_enter_sleep,
+	.set_ip_power = rcpm_v1_set_ip_power,
+	.freeze_time_base = rcpm_v1_freeze_time_base,
+	.get_pm_modes = rcpm_get_pm_modes,
+};
+
+static const struct fsl_pm_ops qoriq_rcpm_v2_ops = {
+	.irq_mask = rcpm_v2_irq_mask,
+	.irq_unmask = rcpm_v2_irq_unmask,
+	.cpu_enter_state = rcpm_v2_cpu_enter_state,
+	.cpu_exit_state = rcpm_v2_cpu_exit_state,
+	.cpu_up_prepare = rcpm_v2_cpu_up_prepare,
+	.cpu_die = rcpm_v2_cpu_die,
+	.plat_enter_sleep = rcpm_v2_plat_enter_sleep,
+	.set_ip_power = rcpm_v2_set_ip_power,
+	.freeze_time_base = rcpm_v2_freeze_time_base,
+	.get_pm_modes = rcpm_get_pm_modes,
+};
+
+static const struct of_device_id rcpm_matches[] = {
+	{
+		.compatible = "fsl,qoriq-rcpm-1.0",
+		.data = (void *)&qoriq_rcpm_v1_ops,
+	},
+	{
+		.compatible = "fsl,qoriq-rcpm-2.0",
+		.data = (void *)&qoriq_rcpm_v2_ops,
+	},
+	{
+		.compatible = "fsl,qoriq-rcpm-2.1",
+		.data = (void *)&qoriq_rcpm_v2_ops,
+	},
+	{},
+};
+
+int __init fsl_rcpm_init(void)
+{
+	struct device_node *np;
+	const struct of_device_id *match;
+	void __iomem *base;
+
+	np = of_find_matching_node_and_match(NULL, rcpm_matches, &match);
+	if (!np) {
+		pr_err("can't find the rcpm node.\n");
+		return -ENODEV;
+	}
+
+	base = of_iomap(np, 0);
+	of_node_put(np);
+	if (!base) {
+		pr_err("of_iomap() error.\n");
+		return -ENOMEM;
+	}
+
+	rcpm_v1_regs = base;
+	rcpm_v2_regs = base;
+
+	/* support sleep by default */
+	fsl_supported_pm_modes = FSL_PM_SLEEP;
+
+	qoriq_pm_ops = match->data;
+
+	return 0;
+}
-- 
1.9.1

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