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powerpc/rcpm: add RCPM driver

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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.

Signed-off-by: Chenhui Zhao <chenhui.zhao@freescale.com>
Signed-off-by: Tang Yuantian <Yuantian.Tang@freescale.com>
[scottwood: remove __KERNEL__ ifdef]
Signed-off-by: Scott Wood <oss@buserror.net>
This commit is contained in:
chenhui zhao 2015-11-20 17:13:59 +08:00 committed by Scott Wood
parent e7affb1dba
commit d17799f9c1
9 changed files with 571 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

1
arch/powerpc/include/asm/cputhreads.h
View file

@ -103,6 +103,7 @@ static inline u32 get_tensr(void)
return 1;
}
void book3e_stop_thread(int thread);
#endif /* _ASM_POWERPC_CPUTHREADS_H */

51
arch/powerpc/include/asm/fsl_pm.h Normal file
View file

@ -0,0 +1,51 @@
/*
* 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
#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;
int __init fsl_rcpm_init(void);
#endif /* __PPC_FSL_PM_H */

19
arch/powerpc/kernel/head_64.S
View file

@ -181,6 +181,25 @@ exception_marker:
#endif
#ifdef CONFIG_PPC_BOOK3E
/*
* stop a thread in the same core
* input parameter:
* r3 = the thread physical id
*/
_GLOBAL(book3e_stop_thread)
cmpi 0, r3, 0
beq 10f
cmpi 0, r3, 1
beq 10f
/* If the thread id is invalid, just exit. */
b 13f
10:
li r4, 1
sld r4, r4, r3
mtspr SPRN_TENC, r4
13:
blr
_GLOBAL(fsl_secondary_thread_init)
mfspr r4,SPRN_BUCSR

1
arch/powerpc/platforms/85xx/Kconfig
View file

@ -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

3
arch/powerpc/platforms/85xx/common.c
View file

@ -9,11 +9,14 @@
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <asm/fsl_pm.h>
#include <soc/fsl/qe/qe.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", },

5
arch/powerpc/sysdev/Kconfig
View file

@ -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).

1
arch/powerpc/sysdev/Makefile
View file

@ -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

385
arch/powerpc/sysdev/fsl_rcpm.c Normal file
View file

@ -0,0 +1,385 @@
/*
* RCPM(Run Control/Power Management) support
*
* Copyright 2012-2015 Freescale Semiconductor Inc.
*
* Author: Chenhui Zhao <chenhui.zhao@freescale.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 <linux/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(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_PPC64
static void qoriq_disable_thread(int cpu)
{
int thread = cpu_thread_in_core(cpu);
book3e_stop_thread(thread);
}
#endif
static void rcpm_v2_cpu_die(int cpu)
{
#ifdef CONFIG_PPC64
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);
}
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(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 = &qoriq_rcpm_v1_ops,
},
{
.compatible = "fsl,qoriq-rcpm-2.0",
.data = &qoriq_rcpm_v2_ops,
},
{
.compatible = "fsl,qoriq-rcpm-2.1",
.data = &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)
return 0;
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;
}

105
include/linux/fsl/guts.h
View file

@ -189,4 +189,109 @@ 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