Fixup the Linux FDT with the detection of onboard DRAM as provided by SBL (Secondary boot loader) by reading the shared-memory region.
Signed-off-by: Ramon Fried ramon.fried@gmail.com --- v2: fixed compiler warning introduced because missing include
arch/arm/mach-snapdragon/Makefile | 1 + arch/arm/mach-snapdragon/dram.c | 98 ++++++++++++++++++++ arch/arm/mach-snapdragon/include/mach/dram.h | 12 +++ 3 files changed, 111 insertions(+) create mode 100644 arch/arm/mach-snapdragon/dram.c create mode 100644 arch/arm/mach-snapdragon/include/mach/dram.h
diff --git a/arch/arm/mach-snapdragon/Makefile b/arch/arm/mach-snapdragon/Makefile index 1d35fea912..f375d07d03 100644 --- a/arch/arm/mach-snapdragon/Makefile +++ b/arch/arm/mach-snapdragon/Makefile @@ -9,3 +9,4 @@ obj-$(CONFIG_TARGET_DRAGONBOARD410C) += sysmap-apq8016.o obj-$(CONFIG_TARGET_DRAGONBOARD410C) += pinctrl-apq8016.o obj-$(CONFIG_TARGET_DRAGONBOARD410C) += pinctrl-snapdragon.o obj-y += clock-snapdragon.o +obj-y += dram.o diff --git a/arch/arm/mach-snapdragon/dram.c b/arch/arm/mach-snapdragon/dram.c new file mode 100644 index 0000000000..79eb19992d --- /dev/null +++ b/arch/arm/mach-snapdragon/dram.c @@ -0,0 +1,98 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Onboard memory detection for Snapdragon boards + * + * (C) Copyright 2018 Ramon Fried ramon.fried@gmail.com + * + */ + +#include <common.h> +#include <dm.h> +#include <smem.h> +#include <fdt_support.h> +#include <asm/arch/dram.h> + +#define SMEM_USABLE_RAM_PARTITION_TABLE 402 +#define RAM_PART_NAME_LENGTH 16 +#define RAM_NUM_PART_ENTRIES 32 +#define CATEGORY_SDRAM 0x0E +#define TYPE_SYSMEM 0x01 + +struct smem_ram_ptable_hdr { + u32 magic[2]; + u32 version; + u32 reserved; + u32 len; +} __attribute__ ((__packed__)); + +struct smem_ram_ptn { + char name[RAM_PART_NAME_LENGTH]; + u64 start; + u64 size; + u32 attr; + u32 category; + u32 domain; + u32 type; + u32 num_partitions; + u32 reserved[3]; +} __attribute__ ((__packed__)); + +struct smem_ram_ptable { + struct smem_ram_ptable_hdr hdr; + u32 reserved; /* Added for 8 bytes alignment of header */ + struct smem_ram_ptn parts[RAM_NUM_PART_ENTRIES]; +} __attribute__ ((__packed__)); + +#ifndef MEMORY_BANKS_MAX +#define MEMORY_BANKS_MAX 4 +#endif + +int msm_fixup_memory(void *blob) +{ + u64 bank_start[MEMORY_BANKS_MAX]; + u64 bank_size[MEMORY_BANKS_MAX]; + size_t size; + int i; + int count = 0; + struct udevice *smem; + int ret; + struct smem_ram_ptable *ram_ptable; + struct smem_ram_ptn *p; + + ret = uclass_get_device_by_name(UCLASS_SMEM, "smem", &smem); + if (ret < 0) { + printf("Failed to find SMEM node. Check device tree\n"); + return 0; + } + + ram_ptable = smem_get(smem, -1, SMEM_USABLE_RAM_PARTITION_TABLE, &size); + + if (!ram_ptable) { + printf("Failed to find SMEM partition.\n"); + return -ENODEV; + } + + /* Check validy of RAM */ + for (i = 0; i < RAM_NUM_PART_ENTRIES; i++) { + p = &ram_ptable->parts[i]; + if (p->category == CATEGORY_SDRAM && p->type == TYPE_SYSMEM) { + bank_start[count] = p->start; + bank_size[count] = p->size; + debug("Detected memory bank %u: start: 0x%llx size: 0x%llx\n", + count, p->start, p->size); + count++; + } + } + + if (!count) { + printf("Failed to detect any memory bank\n"); + return -ENODEV; + } + + ret = fdt_fixup_memory_banks(blob, bank_start, bank_size, count); + if (ret) + return ret; + + return 0; +} + diff --git a/arch/arm/mach-snapdragon/include/mach/dram.h b/arch/arm/mach-snapdragon/include/mach/dram.h new file mode 100644 index 0000000000..0a9eedda41 --- /dev/null +++ b/arch/arm/mach-snapdragon/include/mach/dram.h @@ -0,0 +1,12 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * Snapdragon DRAM + * Copyright (C) 2018 Ramon Fried ramon.fried@gmail.com + */ + +#ifndef DRAM_H +#define DRAM_H + +int msm_fixup_memory(void *blob); + +#endif