From 010232aa443377cc848cd60fc55cf53d2db4b286 Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Sat, 26 Apr 2014 13:17:11 +0100 Subject: [PATCH 36/36] ARM: HYP/non-sec/PSCI: emit DT nodes Generate the PSCI node in the device tree. Also add a reserve section for the "secure" code that lives in in normal RAM, so that the kernel knows it'd better not trip on it. Signed-off-by: Marc Zyngier --- arch/arm/cpu/armv7/Makefile | 1 + arch/arm/cpu/armv7/virt-dt.c | 100 +++++++++++++++++++++++++++++++++++++++++++ arch/arm/include/asm/armv7.h | 1 + arch/arm/lib/bootm-fdt.c | 12 +++++- 4 files changed, 112 insertions(+), 2 deletions(-) create mode 100644 arch/arm/cpu/armv7/virt-dt.c diff --git a/arch/arm/cpu/armv7/Makefile b/arch/arm/cpu/armv7/Makefile index da5ce22..ea7b9a5 100644 --- a/arch/arm/cpu/armv7/Makefile +++ b/arch/arm/cpu/armv7/Makefile @@ -21,6 +21,7 @@ endif ifneq ($(CONFIG_ARMV7_NONSEC)$(CONFIG_ARMV7_VIRT),) obj-y += nonsec_virt.o obj-y += virt-v7.o +obj-y += virt-dt.o endif ifneq ($(CONFIG_ARMV7_PSCI),) diff --git a/arch/arm/cpu/armv7/virt-dt.c b/arch/arm/cpu/armv7/virt-dt.c new file mode 100644 index 0000000..0b0d6a7 --- /dev/null +++ b/arch/arm/cpu/armv7/virt-dt.c @@ -0,0 +1,100 @@ +/* + * Copyright (C) 2013 - ARM Ltd + * Author: Marc Zyngier + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static int fdt_psci(void *fdt) +{ +#ifdef CONFIG_ARMV7_PSCI + int nodeoff; + int tmp; + + nodeoff = fdt_path_offset(fdt, "/cpus"); + if (nodeoff < 0) { + printf("couldn't find /cpus\n"); + return nodeoff; + } + + /* add 'enable-method = "psci"' to each cpu node */ + for (tmp = fdt_first_subnode(fdt, nodeoff); + tmp >= 0; + tmp = fdt_next_subnode(fdt, tmp)) { + const struct fdt_property *prop; + int len; + + prop = fdt_get_property(fdt, tmp, "device_type", &len); + if (!prop) + continue; + if (len < 4) + continue; + if (strcmp(prop->data, "cpu")) + continue; + + fdt_setprop_string(fdt, tmp, "enable-method", "psci"); + } + + nodeoff = fdt_path_offset(fdt, "/psci"); + if (nodeoff < 0) { + nodeoff = fdt_path_offset(fdt, "/"); + if (nodeoff < 0) + return nodeoff; + + nodeoff = fdt_add_subnode(fdt, nodeoff, "psci"); + if (nodeoff < 0) + return nodeoff; + } + + tmp = fdt_setprop_string(fdt, nodeoff, "compatible", "arm,psci"); + if (tmp) + return tmp; + tmp = fdt_setprop_string(fdt, nodeoff, "method", "smc"); + if (tmp) + return tmp; + tmp = fdt_setprop_u32(fdt, nodeoff, "cpu_suspend", ARM_PSCI_FN_CPU_SUSPEND); + if (tmp) + return tmp; + tmp = fdt_setprop_u32(fdt, nodeoff, "cpu_off", ARM_PSCI_FN_CPU_OFF); + if (tmp) + return tmp; + tmp = fdt_setprop_u32(fdt, nodeoff, "cpu_on", ARM_PSCI_FN_CPU_ON); + if (tmp) + return tmp; + tmp = fdt_setprop_u32(fdt, nodeoff, "migrate", ARM_PSCI_FN_MIGRATE); + if (tmp) + return tmp; +#endif + return 0; +} + +int armv7_update_dt(void *fdt) +{ +#ifndef CONFIG_ARMV7_SECURE_BASE + /* secure code lives in RAM, keep it alive */ + fdt_add_mem_rsv(fdt, (unsigned long)__secure_start, + __secure_end - __secure_start); +#endif + + return fdt_psci(fdt); +} diff --git a/arch/arm/include/asm/armv7.h b/arch/arm/include/asm/armv7.h index 11476dd..323f282 100644 --- a/arch/arm/include/asm/armv7.h +++ b/arch/arm/include/asm/armv7.h @@ -79,6 +79,7 @@ void v7_outer_cache_inval_range(u32 start, u32 end); #if defined(CONFIG_ARMV7_NONSEC) || defined(CONFIG_ARMV7_VIRT) int armv7_init_nonsec(void); +int armv7_update_dt(void *fdt); /* defined in assembly file */ unsigned int _nonsec_init(void); diff --git a/arch/arm/lib/bootm-fdt.c b/arch/arm/lib/bootm-fdt.c index 8394e15..d4f1578 100644 --- a/arch/arm/lib/bootm-fdt.c +++ b/arch/arm/lib/bootm-fdt.c @@ -17,13 +17,14 @@ #include #include +#include DECLARE_GLOBAL_DATA_PTR; int arch_fixup_fdt(void *blob) { bd_t *bd = gd->bd; - int bank; + int bank, ret; u64 start[CONFIG_NR_DRAM_BANKS]; u64 size[CONFIG_NR_DRAM_BANKS]; @@ -32,5 +33,12 @@ int arch_fixup_fdt(void *blob) size[bank] = bd->bi_dram[bank].size; } - return fdt_fixup_memory_banks(blob, start, size, CONFIG_NR_DRAM_BANKS); + ret = fdt_fixup_memory_banks(blob, start, size, CONFIG_NR_DRAM_BANKS); +#if defined(CONFIG_ARMV7_NONSEC) || defined(CONFIG_ARMV7_VIRT) + if (ret) + return ret; + + ret = armv7_update_dt(blob); +#endif + return ret; } -- 1.9.0