xref: /openbmc/u-boot/arch/arm/mach-snapdragon/dram.c (revision e3963c09)
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