Merge tag 'u-boot-atmel-fixes-2020.07-a' of https://gitlab.denx.de/u-boot/custodians...
[oweals/u-boot.git] / arch / arm / mach-snapdragon / dram.c
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 <log.h>
12 #include <part.h>
13 #include <smem.h>
14 #include <fdt_support.h>
15 #include <asm/arch/dram.h>
16
17 #define SMEM_USABLE_RAM_PARTITION_TABLE 402
18 #define RAM_PART_NAME_LENGTH            16
19 #define RAM_NUM_PART_ENTRIES            32
20 #define CATEGORY_SDRAM 0x0E
21 #define TYPE_SYSMEM 0x01
22
23 struct smem_ram_ptable_hdr {
24         u32 magic[2];
25         u32 version;
26         u32 reserved;
27         u32 len;
28 } __attribute__ ((__packed__));
29
30 struct smem_ram_ptn {
31         char name[RAM_PART_NAME_LENGTH];
32         u64 start;
33         u64 size;
34         u32 attr;
35         u32 category;
36         u32 domain;
37         u32 type;
38         u32 num_partitions;
39         u32 reserved[3];
40 } __attribute__ ((__packed__));
41
42 struct smem_ram_ptable {
43         struct smem_ram_ptable_hdr hdr;
44         u32 reserved;     /* Added for 8 bytes alignment of header */
45         struct smem_ram_ptn parts[RAM_NUM_PART_ENTRIES];
46 } __attribute__ ((__packed__));
47
48 #ifndef MEMORY_BANKS_MAX
49 #define MEMORY_BANKS_MAX 4
50 #endif
51
52 int msm_fixup_memory(void *blob)
53 {
54         u64 bank_start[MEMORY_BANKS_MAX];
55         u64 bank_size[MEMORY_BANKS_MAX];
56         size_t size;
57         int i;
58         int count = 0;
59         struct udevice *smem;
60         int ret;
61         struct smem_ram_ptable *ram_ptable;
62         struct smem_ram_ptn *p;
63
64         ret = uclass_get_device_by_name(UCLASS_SMEM, "smem", &smem);
65         if (ret < 0) {
66                 printf("Failed to find SMEM node. Check device tree\n");
67                 return 0;
68         }
69
70         ram_ptable = smem_get(smem, -1, SMEM_USABLE_RAM_PARTITION_TABLE, &size);
71
72         if (!ram_ptable) {
73                 printf("Failed to find SMEM partition.\n");
74                 return -ENODEV;
75         }
76
77         /* Check validy of RAM */
78         for (i = 0; i < RAM_NUM_PART_ENTRIES; i++) {
79                 p = &ram_ptable->parts[i];
80                 if (p->category == CATEGORY_SDRAM && p->type == TYPE_SYSMEM) {
81                         bank_start[count] = p->start;
82                         bank_size[count] = p->size;
83                         debug("Detected memory bank %u: start: 0x%llx size: 0x%llx\n",
84                                         count, p->start, p->size);
85                         count++;
86                 }
87         }
88
89         if (!count) {
90                 printf("Failed to detect any memory bank\n");
91                 return -ENODEV;
92         }
93
94         ret = fdt_fixup_memory_banks(blob, bank_start, bank_size, count);
95         if (ret)
96                 return ret;
97
98         return 0;
99 }
100