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[karo-tx-uboot.git] / arch / x86 / cpu / coreboot / sdram.c
1 /*
2  * Copyright (c) 2011 The Chromium OS Authors.
3  * (C) Copyright 2010,2011
4  * Graeme Russ, <graeme.russ@gmail.com>
5  *
6  * SPDX-License-Identifier:     GPL-2.0+
7  */
8
9 #include <common.h>
10 #include <malloc.h>
11 #include <asm/e820.h>
12 #include <asm/u-boot-x86.h>
13 #include <asm/global_data.h>
14 #include <asm/processor.h>
15 #include <asm/sections.h>
16 #include <asm/arch/sysinfo.h>
17 #include <asm/arch/tables.h>
18
19 DECLARE_GLOBAL_DATA_PTR;
20
21 unsigned install_e820_map(unsigned max_entries, struct e820entry *entries)
22 {
23         int i;
24
25         unsigned num_entries = min(lib_sysinfo.n_memranges, max_entries);
26         if (num_entries < lib_sysinfo.n_memranges) {
27                 printf("Warning: Limiting e820 map to %d entries.\n",
28                         num_entries);
29         }
30         for (i = 0; i < num_entries; i++) {
31                 struct memrange *memrange = &lib_sysinfo.memrange[i];
32
33                 entries[i].addr = memrange->base;
34                 entries[i].size = memrange->size;
35                 entries[i].type = memrange->type;
36         }
37         return num_entries;
38 }
39
40 /*
41  * This function looks for the highest region of memory lower than 4GB which
42  * has enough space for U-Boot where U-Boot is aligned on a page boundary. It
43  * overrides the default implementation found elsewhere which simply picks the
44  * end of ram, wherever that may be. The location of the stack, the relocation
45  * address, and how far U-Boot is moved by relocation are set in the global
46  * data structure.
47  */
48 ulong board_get_usable_ram_top(ulong total_size)
49 {
50         uintptr_t dest_addr = 0;
51         int i;
52
53         for (i = 0; i < lib_sysinfo.n_memranges; i++) {
54                 struct memrange *memrange = &lib_sysinfo.memrange[i];
55                 /* Force U-Boot to relocate to a page aligned address. */
56                 uint64_t start = roundup(memrange->base, 1 << 12);
57                 uint64_t end = memrange->base + memrange->size;
58
59                 /* Ignore non-memory regions. */
60                 if (memrange->type != CB_MEM_RAM)
61                         continue;
62
63                 /* Filter memory over 4GB. */
64                 if (end > 0xffffffffULL)
65                         end = 0x100000000ULL;
66                 /* Skip this region if it's too small. */
67                 if (end - start < total_size)
68                         continue;
69
70                 /* Use this address if it's the largest so far. */
71                 if (end > dest_addr)
72                         dest_addr = end;
73         }
74
75         /* If no suitable area was found, return an error. */
76         if (!dest_addr)
77                 panic("No available memory found for relocation");
78
79         return (ulong)dest_addr;
80 }
81
82 int dram_init_f(void)
83 {
84         int i;
85         phys_size_t ram_size = 0;
86
87         for (i = 0; i < lib_sysinfo.n_memranges; i++) {
88                 struct memrange *memrange = &lib_sysinfo.memrange[i];
89                 unsigned long long end = memrange->base + memrange->size;
90
91                 if (memrange->type == CB_MEM_RAM && end > ram_size)
92                         ram_size = end;
93         }
94         gd->ram_size = ram_size;
95         if (ram_size == 0)
96                 return -1;
97         return 0;
98 }
99
100 int dram_init_banksize(void)
101 {
102         int i, j;
103
104         if (CONFIG_NR_DRAM_BANKS) {
105                 for (i = 0, j = 0; i < lib_sysinfo.n_memranges; i++) {
106                         struct memrange *memrange = &lib_sysinfo.memrange[i];
107
108                         if (memrange->type == CB_MEM_RAM) {
109                                 gd->bd->bi_dram[j].start = memrange->base;
110                                 gd->bd->bi_dram[j].size = memrange->size;
111                                 j++;
112                                 if (j >= CONFIG_NR_DRAM_BANKS)
113                                         break;
114                         }
115                 }
116         }
117         return 0;
118 }
119
120 int dram_init(void)
121 {
122         return dram_init_banksize();
123 }