From 7444dad2409afd94c08875e961ca61c5999cd606 Mon Sep 17 00:00:00 2001 From: Gregory CLEMENT Date: Thu, 2 Aug 2012 11:17:51 +0300 Subject: arm: mvebu: Add initial support for power managmement service unit The Armada 370 and Armada XP SOCs have a power management service unit which is responsible for powering down and waking up CPUs and other SOC units. This patch adds support for this unit. Signed-off-by: Yehuda Yitschak Signed-off-by: Gregory CLEMENT --- arch/arm/mach-mvebu/Makefile | 2 +- arch/arm/mach-mvebu/common.h | 1 + arch/arm/mach-mvebu/pmsu.c | 75 ++++++++++++++++++++++++++++++++++++++++++++ arch/arm/mach-mvebu/pmsu.h | 16 ++++++++++ 4 files changed, 93 insertions(+), 1 deletion(-) create mode 100644 arch/arm/mach-mvebu/pmsu.c create mode 100644 arch/arm/mach-mvebu/pmsu.h (limited to 'arch/arm/mach-mvebu') diff --git a/arch/arm/mach-mvebu/Makefile b/arch/arm/mach-mvebu/Makefile index 5ce4b42c2697..2e3ec11c51e6 100644 --- a/arch/arm/mach-mvebu/Makefile +++ b/arch/arm/mach-mvebu/Makefile @@ -2,4 +2,4 @@ ccflags-$(CONFIG_ARCH_MULTIPLATFORM) := -I$(srctree)/$(src)/include \ -I$(srctree)/arch/arm/plat-orion/include obj-y += system-controller.o -obj-$(CONFIG_MACH_ARMADA_370_XP) += armada-370-xp.o irq-armada-370-xp.o addr-map.o coherency.o coherency_ll.o +obj-$(CONFIG_MACH_ARMADA_370_XP) += armada-370-xp.o irq-armada-370-xp.o addr-map.o coherency.o coherency_ll.o pmsu.o diff --git a/arch/arm/mach-mvebu/common.h b/arch/arm/mach-mvebu/common.h index ba6b62a42f52..9285d0496651 100644 --- a/arch/arm/mach-mvebu/common.h +++ b/arch/arm/mach-mvebu/common.h @@ -21,4 +21,5 @@ void armada_370_xp_init_irq(void); void armada_370_xp_handle_irq(struct pt_regs *regs); int armada_370_xp_coherency_init(void); +int armada_370_xp_pmsu_init(void); #endif diff --git a/arch/arm/mach-mvebu/pmsu.c b/arch/arm/mach-mvebu/pmsu.c new file mode 100644 index 000000000000..3cc4bef6401c --- /dev/null +++ b/arch/arm/mach-mvebu/pmsu.c @@ -0,0 +1,75 @@ +/* + * Power Management Service Unit(PMSU) support for Armada 370/XP platforms. + * + * Copyright (C) 2012 Marvell + * + * Yehuda Yitschak + * Gregory Clement + * Thomas Petazzoni + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + * + * The Armada 370 and Armada XP SOCs have a power management service + * unit which is responsible for powering down and waking up CPUs and + * other SOC units + */ + +#include +#include +#include +#include +#include +#include + +static void __iomem *pmsu_mp_base; +static void __iomem *pmsu_reset_base; + +#define PMSU_BOOT_ADDR_REDIRECT_OFFSET(cpu) ((cpu * 0x100) + 0x24) +#define PMSU_RESET_CTL_OFFSET(cpu) (cpu * 0x8) + +static struct of_device_id of_pmsu_table[] = { + {.compatible = "marvell,armada-370-xp-pmsu"}, + { /* end of list */ }, +}; + +#ifdef CONFIG_SMP +int armada_xp_boot_cpu(unsigned int cpu_id, void *boot_addr) +{ + int reg, hw_cpu; + + if (!pmsu_mp_base || !pmsu_reset_base) { + pr_warn("Can't boot CPU. PMSU is uninitialized\n"); + return 1; + } + + hw_cpu = cpu_logical_map(cpu_id); + + writel(virt_to_phys(boot_addr), pmsu_mp_base + + PMSU_BOOT_ADDR_REDIRECT_OFFSET(hw_cpu)); + + /* Release CPU from reset by clearing reset bit*/ + reg = readl(pmsu_reset_base + PMSU_RESET_CTL_OFFSET(hw_cpu)); + reg &= (~0x1); + writel(reg, pmsu_reset_base + PMSU_RESET_CTL_OFFSET(hw_cpu)); + + return 0; +} +#endif + +int __init armada_370_xp_pmsu_init(void) +{ + struct device_node *np; + + np = of_find_matching_node(NULL, of_pmsu_table); + if (np) { + pr_info("Initializing Power Management Service Unit\n"); + pmsu_mp_base = of_iomap(np, 0); + pmsu_reset_base = of_iomap(np, 1); + } + + return 0; +} + +early_initcall(armada_370_xp_pmsu_init); diff --git a/arch/arm/mach-mvebu/pmsu.h b/arch/arm/mach-mvebu/pmsu.h new file mode 100644 index 000000000000..07a737c6b95d --- /dev/null +++ b/arch/arm/mach-mvebu/pmsu.h @@ -0,0 +1,16 @@ +/* + * Power Management Service Unit (PMSU) support for Armada 370/XP platforms. + * + * Copyright (C) 2012 Marvell + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ + +#ifndef __MACH_MVEBU_PMSU_H +#define __MACH_MVEBU_PMSU_H + +int armada_xp_boot_cpu(unsigned int cpu_id, void *phys_addr); + +#endif /* __MACH_370_XP_PMSU_H */ -- cgit v1.2.3