1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Onboard memory detection for Snapdragon boards 4 * 5 * (C) Copyright 2018 Ramon Fried <ramon.fried@gmail.com> 6 * 7 */ 8 9 #include <common.h> 10 #include <dm.h> 11 #include <smem.h> 12 #include <fdt_support.h> 13 #include <asm/arch/dram.h> 14 15 #define SMEM_USABLE_RAM_PARTITION_TABLE 402 16 #define RAM_PART_NAME_LENGTH 16 17 #define RAM_NUM_PART_ENTRIES 32 18 #define CATEGORY_SDRAM 0x0E 19 #define TYPE_SYSMEM 0x01 20 21 struct smem_ram_ptable_hdr { 22 u32 magic[2]; 23 u32 version; 24 u32 reserved; 25 u32 len; 26 } __attribute__ ((__packed__)); 27 28 struct smem_ram_ptn { 29 char name[RAM_PART_NAME_LENGTH]; 30 u64 start; 31 u64 size; 32 u32 attr; 33 u32 category; 34 u32 domain; 35 u32 type; 36 u32 num_partitions; 37 u32 reserved[3]; 38 } __attribute__ ((__packed__)); 39 40 struct smem_ram_ptable { 41 struct smem_ram_ptable_hdr hdr; 42 u32 reserved; /* Added for 8 bytes alignment of header */ 43 struct smem_ram_ptn parts[RAM_NUM_PART_ENTRIES]; 44 } __attribute__ ((__packed__)); 45 46 #ifndef MEMORY_BANKS_MAX 47 #define MEMORY_BANKS_MAX 4 48 #endif 49 50 int msm_fixup_memory(void *blob) 51 { 52 u64 bank_start[MEMORY_BANKS_MAX]; 53 u64 bank_size[MEMORY_BANKS_MAX]; 54 size_t size; 55 int i; 56 int count = 0; 57 struct udevice *smem; 58 int ret; 59 struct smem_ram_ptable *ram_ptable; 60 struct smem_ram_ptn *p; 61 62 ret = uclass_get_device_by_name(UCLASS_SMEM, "smem", &smem); 63 if (ret < 0) { 64 printf("Failed to find SMEM node. Check device tree\n"); 65 return 0; 66 } 67 68 ram_ptable = smem_get(smem, -1, SMEM_USABLE_RAM_PARTITION_TABLE, &size); 69 70 if (!ram_ptable) { 71 printf("Failed to find SMEM partition.\n"); 72 return -ENODEV; 73 } 74 75 /* Check validy of RAM */ 76 for (i = 0; i < RAM_NUM_PART_ENTRIES; i++) { 77 p = &ram_ptable->parts[i]; 78 if (p->category == CATEGORY_SDRAM && p->type == TYPE_SYSMEM) { 79 bank_start[count] = p->start; 80 bank_size[count] = p->size; 81 debug("Detected memory bank %u: start: 0x%llx size: 0x%llx\n", 82 count, p->start, p->size); 83 count++; 84 } 85 } 86 87 if (!count) { 88 printf("Failed to detect any memory bank\n"); 89 return -ENODEV; 90 } 91 92 ret = fdt_fixup_memory_banks(blob, bank_start, bank_size, count); 93 if (ret) 94 return ret; 95 96 return 0; 97 } 98 99