diff options
author | Chen-Hui Zhao <chenhui.zhao@freescale.com> | 2012-08-30 17:48:26 (GMT) |
---|---|---|
committer | Fleming Andrew-AFLEMING <AFLEMING@freescale.com> | 2013-04-12 20:56:14 (GMT) |
commit | 412bd481b80926784d907ed1d62afef2614eaabd (patch) | |
tree | 242713bad9d6e06db37ff7f4040715677118f1d2 /arch | |
parent | 4099f70e94789731c3a20f89be058cfb2bfed836 (diff) | |
download | linux-fsl-qoriq-412bd481b80926784d907ed1d62afef2614eaabd.tar.xz |
powerpc/rcpm: add sleep feature for SoCs using RCPM
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>
(cherry picked from commit 96b915172420c4089d656f981c1c954ce3aa87bd)
Change-Id: I3fcd637916a01777919a91e03ceef929e46a901b
Reviewed-on: http://git.am.freescale.net:8181/1180
Tested-by: Fleming Andrew-AFLEMING <AFLEMING@freescale.com>
Reviewed-by: Fleming Andrew-AFLEMING <AFLEMING@freescale.com>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/powerpc/Kconfig | 4 | ||||
-rw-r--r-- | arch/powerpc/include/asm/fsl_guts.h | 1 | ||||
-rw-r--r-- | arch/powerpc/platforms/85xx/Kconfig | 1 | ||||
-rw-r--r-- | arch/powerpc/sysdev/Kconfig | 5 | ||||
-rw-r--r-- | arch/powerpc/sysdev/Makefile | 1 | ||||
-rw-r--r-- | arch/powerpc/sysdev/fsl_rcpm.c | 102 |
6 files changed, 112 insertions, 2 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 0fb7bfd..9bbe82d 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -222,7 +222,7 @@ 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 @@ -688,7 +688,7 @@ 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 71a9130..193d1f1 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 44aff62..5368ca4 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 3d71e88..fa63186 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..bf74be8 --- /dev/null +++ b/arch/powerpc/sysdev/fsl_rcpm.c @@ -0,0 +1,102 @@ +/* + * RCPM(Run Control/Power Management) support + * + * Copyright 2012 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 <linux/export.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", + .owner = THIS_MODULE, + .of_match_table = rcpm_ids, + }, + .probe = rcpm_probe, +}; + +static int __init rcpm_init(void) +{ + return platform_driver_register(&rcpm_driver); +} + +device_initcall(rcpm_init); |