Commit 36adb7c9 authored by Ramon Fried's avatar Ramon Fried Committed by Tom Rini
Browse files

snapdragon: Add DRAM detection & FDT fixup



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: default avatarRamon Fried <ramon.fried@gmail.com>
parent 8f690848
......@@ -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
// 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;
}
/* 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
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