[PATCH 3/9] powerpc/rcpm: add RCPM driver

From: Chenhui Zhao
Date: Thu Mar 06 2014 - 23:58:49 EST

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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.

There are two versions of register map in RCPM, which is specified by
the compatible entry in the RCPM node of device tree.

Signed-off-by: Chenhui Zhao <chenhui.zhao@xxxxxxxxxxxxx>
---
arch/powerpc/include/asm/fsl_guts.h | 105 ++++++++
arch/powerpc/platforms/85xx/Kconfig | 1 +
arch/powerpc/platforms/85xx/corenet_generic.c | 2 +
arch/powerpc/sysdev/Kconfig | 5 +
arch/powerpc/sysdev/Makefile | 1 +
arch/powerpc/sysdev/fsl_rcpm.c | 315 +++++++++++++++++++++++++
arch/powerpc/sysdev/fsl_soc.h | 24 ++
7 files changed, 453 insertions(+), 0 deletions(-)
create mode 100644 arch/powerpc/sysdev/fsl_rcpm.c

diff --git a/arch/powerpc/include/asm/fsl_guts.h b/arch/powerpc/include/asm/fsl_guts.h
index 77ced0b..492534a 100644
--- a/arch/powerpc/include/asm/fsl_guts.h
+++ b/arch/powerpc/include/asm/fsl_guts.h
@@ -185,5 +185,110 @@ 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 Power Mangement 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];
+ u32 tph10sr0; /* Thread PH10 Status Register */
+ u8 res_10[12];
+ u32 tph10setr0; /* Thread PH10 Set Control Register */
+ u8 res_20[12];
+ u32 tph10clrr0; /* Thread PH10 Clear Control Register */
+ u8 res_30[12];
+ u32 tph10psr0; /* Thread PH10 Previous Status Register */
+ u8 res_40[12];
+ u32 twaitsr0; /* Thread Wait Status Register */
+ u8 res_50[96];
+ u32 pcph15sr; /* Physical Core PH15 Status Register */
+ u32 pcph15setr; /* Physical Core PH15 Set Control Register */
+ u32 pcph15clrr; /* Physical Core PH15 Clear Control Register */
+ u32 pcph15psr; /* Physical Core PH15 Prev Status Register */
+ u8 res_c0[16];
+ u32 pcph20sr; /* Physical Core PH20 Status Register */
+ u32 pcph20setr; /* Physical Core PH20 Set Control Register */
+ u32 pcph20clrr; /* Physical Core PH20 Clear Control Register */
+ u32 pcph20psr; /* Physical Core PH20 Prev Status Register */
+ u32 pcpw20sr; /* Physical Core PW20 Status Register */
+ u8 res_e0[12];
+ u32 pcph30sr; /* Physical Core PH30 Status Register */
+ u32 pcph30setr; /* Physical Core PH30 Set Control Register */
+ u32 pcph30clrr; /* Physical Core PH30 Clear Control Register */
+ u32 pcph30psr; /* Physical Core PH30 Prev Status Register */
+ u8 res_100[32];
+ u32 ippwrgatecr; /* IP Power Gating Control Register */
+ u8 res_124[12];
+ u32 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];
+ u32 ippdexpcr[4]; /* IP Powerdown Exception Control Reg */
+ u8 res_150[12];
+ u32 tpmimr0; /* Thread PM Interrupt Mask Reg */
+ u8 res_160[12];
+ u32 tpmcimr0; /* Thread PM Crit Interrupt Mask Reg */
+ u8 res_170[12];
+ u32 tpmmcmr0; /* Thread PM Machine Check Interrupt Mask Reg */
+ u8 res_180[12];
+ u32 tpmnmimr0; /* Thread PM NMI Mask Reg */
+ u8 res_190[12];
+ u32 tmcpmaskcr0; /* Thread Machine Check Mask Control Reg */
+ u32 pctbenr; /* Physical Core Time Base Enable Reg */
+ u32 pctbclkselr; /* Physical Core Time Base Clock Select */
+ u32 tbclkdivr; /* Time Base Clock Divider Register */
+ u8 res_1ac[4];
+ u32 ttbhltcr[4]; /* Thread Time Base Halt Control Register */
+ u32 clpcl10sr; /* Cluster PCL10 Status Register */
+ u32 clpcl10setr; /* Cluster PCL30 Set Control Register */
+ u32 clpcl10clrr; /* Cluster PCL30 Clear Control Register */
+ u32 clpcl10psr; /* Cluster PCL30 Prev Status Register */
+ u32 cddslpsetr; /* Core Domain Deep Sleep Set Register */
+ u32 cddslpclrr; /* Core Domain Deep Sleep Clear Register */
+ u32 cdpwroksetr; /* Core Domain Power OK Set Register */
+ u32 cdpwrokclrr; /* Core Domain Power OK Clear Register */
+ u32 cdpwrensr; /* Core Domain Power Enable Status Register */
+ u32 cddslsr; /* Core Domain Deep Sleep Status Register */
+ u8 res_1e8[8];
+ u32 dslpcntcr[8]; /* Deep Sleep Counter Cfg Register */
+ u8 res_300[3568];
+};
+
#endif
#endif
diff --git a/arch/powerpc/platforms/85xx/Kconfig b/arch/powerpc/platforms/85xx/Kconfig
index c17aae8..54d8843 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/corenet_generic.c b/arch/powerpc/platforms/85xx/corenet_generic.c
index b756f3d..3fdf9f3 100644
--- a/arch/powerpc/platforms/85xx/corenet_generic.c
+++ b/arch/powerpc/platforms/85xx/corenet_generic.c
@@ -56,6 +56,8 @@ void __init corenet_gen_setup_arch(void)

swiotlb_detect_4g();

+ fsl_rcpm_init();
+
pr_info("%s board from Freescale Semiconductor\n", ppc_md.name);
}

diff --git a/arch/powerpc/sysdev/Kconfig b/arch/powerpc/sysdev/Kconfig
index 7baa70d..f6e7cde 100644
--- a/arch/powerpc/sysdev/Kconfig
+++ b/arch/powerpc/sysdev/Kconfig
@@ -34,3 +34,8 @@ 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 f67ac90..a6ada64 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-$(CONFIG_FSL_IFC) += fsl_ifc.o
obj-$(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..493fcae
--- /dev/null
+++ b/arch/powerpc/sysdev/fsl_rcpm.c
@@ -0,0 +1,315 @@
+/*
+ * RCPM(Run Control/Power Management) support
+ *
+ * Copyright 2012-2014 Freescale Semiconductor Inc.
+ *
+ * Author: Chenhui Zhao <chenhui.zhao@xxxxxxxxxxxxx>
+ *
+ * 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/of_address.h>
+#include <linux/export.h>
+
+#include <asm/io.h>
+#include <asm/fsl_guts.h>
+#include <asm/cputhreads.h>
+#include <sysdev/fsl_soc.h>
+
+const struct fsl_pm_ops *qoriq_pm_ops;
+
+static struct ccsr_rcpm_v1 __iomem *rcpm_v1_regs;
+static struct ccsr_rcpm_v2 __iomem *rcpm_v2_regs;
+
+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_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_v1_set_ip_power(int enable, u32 mask)
+{
+ if (enable)
+ setbits32(&rcpm_v1_regs->ippdexpcr, mask);
+ else
+ clrbits32(&rcpm_v1_regs->ippdexpcr, mask);
+}
+
+static void rcpm_v1_cpu_enter_state(int cpu, int state)
+{
+ unsigned 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_err("Unknown cpu PM state\n");
+ break;
+ }
+}
+
+static void rcpm_v1_cpu_exit_state(int cpu, int state)
+{
+ unsigned 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_err("Unknown cpu PM state\n");
+ break;
+ }
+}
+
+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);
+
+ /* At this point, the device is in sleep mode. */
+
+ /* 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("%s: timeout waiting for SLP bit to be cleared\n",
+ __func__);
+ ret = -ETIMEDOUT;
+ }
+ break;
+ default:
+ pr_err("Unsupported platform PM state\n");
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
+static void rcpm_v1_freeze_time_base(int freeze)
+{
+ u32 *tben_reg = &rcpm_v1_regs->ctbenr;
+ 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_v2_freeze_time_base(int freeze)
+{
+ u32 *tben_reg = &rcpm_v2_regs->pctbenr;
+ 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_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_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_v2_set_ip_power(int enable, u32 mask)
+{
+ if (enable)
+ /* enable power of IP blocks in deep sleep mode */
+ setbits32(&rcpm_v2_regs->ippdexpcr[0], mask);
+ else
+ clrbits32(&rcpm_v2_regs->ippdexpcr[0], mask);
+}
+
+static void rcpm_v2_cpu_enter_state(int cpu, int state)
+{
+ unsigned 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_err("Unsupported cpu PM state\n");
+ }
+}
+
+static void rcpm_v2_cpu_exit_state(int cpu, int state)
+{
+ unsigned 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_err("Unsupported cpu PM state\n");
+ }
+}
+
+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("%s: timeout waiting for LPM20 bit to be cleared\n",
+ __func__);
+ ret = -ETIMEDOUT;
+ }
+ break;
+ default:
+ pr_err("Unsupported platform PM state\n");
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
+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,
+ .plat_enter_state = rcpm_v1_plat_enter_state,
+ .set_ip_power = rcpm_v1_set_ip_power,
+ .freeze_time_base = rcpm_v1_freeze_time_base,
+};
+
+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,
+ .plat_enter_state = rcpm_v2_plat_enter_state,
+ .set_ip_power = rcpm_v2_set_ip_power,
+ .freeze_time_base = rcpm_v2_freeze_time_base,
+};
+
+int fsl_rcpm_init(void)
+{
+ struct device_node *np;
+
+ np = of_find_compatible_node(NULL, NULL, "fsl,qoriq-rcpm-2.0");
+ if (np) {
+ rcpm_v2_regs = of_iomap(np, 0);
+ of_node_put(np);
+ if (!rcpm_v2_regs)
+ return -ENOMEM;
+
+ qoriq_pm_ops = &qoriq_rcpm_v2_ops;
+
+ } else {
+ np = of_find_compatible_node(NULL, NULL, "fsl,qoriq-rcpm-1.0");
+ if (np) {
+ rcpm_v1_regs = of_iomap(np, 0);
+ of_node_put(np);
+ if (!rcpm_v1_regs)
+ return -ENOMEM;
+
+ qoriq_pm_ops = &qoriq_rcpm_v1_ops;
+
+ } else {
+ pr_err("%s: can't find the rcpm node.\n", __func__);
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
diff --git a/arch/powerpc/sysdev/fsl_soc.h b/arch/powerpc/sysdev/fsl_soc.h
index 4c5a19e..9b9a34a 100644
--- a/arch/powerpc/sysdev/fsl_soc.h
+++ b/arch/powerpc/sysdev/fsl_soc.h
@@ -45,5 +45,29 @@ extern struct platform_diu_data_ops diu_ops;
void fsl_hv_restart(char *cmd);
void fsl_hv_halt(void);

+struct fsl_pm_ops {
+ void (*irq_mask)(int cpu);
+ void (*irq_unmask)(int cpu);
+ void (*cpu_enter_state)(int cpu, int state);
+ void (*cpu_exit_state)(int cpu, int state);
+ int (*plat_enter_state)(int state);
+ void (*freeze_time_base)(int freeze);
+ void (*set_ip_power)(int enable, u32 mask);
+};
+
+extern const struct fsl_pm_ops *qoriq_pm_ops;
+
+#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
+
+extern int fsl_rcpm_init(void);
+
#endif
#endif
--
1.7.3

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