1 /*
2 * Copyright (c) 2014, NVIDIA CORPORATION. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
15 *
16 */
17
18 #include <linux/kernel.h>
19 #include <linux/of.h>
20 #include <linux/of_address.h>
21 #include <linux/io.h>
22
23 #include <soc/tegra/fuse.h>
24
25 #include "fuse.h"
26
27 #define APBMISC_BASE 0x70000800
28 #define APBMISC_SIZE 0x64
29 #define FUSE_SKU_INFO 0x10
30
31 static void __iomem *apbmisc_base;
32 static void __iomem *strapping_base;
33
tegra_read_chipid(void)34 u32 tegra_read_chipid(void)
35 {
36 return readl_relaxed(apbmisc_base + 4);
37 }
38
tegra_get_chip_id(void)39 u8 tegra_get_chip_id(void)
40 {
41 if (!apbmisc_base) {
42 WARN(1, "Tegra Chip ID not yet available\n");
43 return 0;
44 }
45
46 return (tegra_read_chipid() >> 8) & 0xff;
47 }
48
tegra_read_straps(void)49 u32 tegra_read_straps(void)
50 {
51 if (strapping_base)
52 return readl_relaxed(strapping_base);
53 else
54 return 0;
55 }
56
57 static const struct of_device_id apbmisc_match[] __initconst = {
58 { .compatible = "nvidia,tegra20-apbmisc", },
59 {},
60 };
61
tegra_init_revision(void)62 void __init tegra_init_revision(void)
63 {
64 u32 id, chip_id, minor_rev;
65 int rev;
66
67 id = tegra_read_chipid();
68 chip_id = (id >> 8) & 0xff;
69 minor_rev = (id >> 16) & 0xf;
70
71 switch (minor_rev) {
72 case 1:
73 rev = TEGRA_REVISION_A01;
74 break;
75 case 2:
76 rev = TEGRA_REVISION_A02;
77 break;
78 case 3:
79 if (chip_id == TEGRA20 && (tegra20_spare_fuse_early(18) ||
80 tegra20_spare_fuse_early(19)))
81 rev = TEGRA_REVISION_A03p;
82 else
83 rev = TEGRA_REVISION_A03;
84 break;
85 case 4:
86 rev = TEGRA_REVISION_A04;
87 break;
88 default:
89 rev = TEGRA_REVISION_UNKNOWN;
90 }
91
92 tegra_sku_info.revision = rev;
93
94 if (chip_id == TEGRA20)
95 tegra_sku_info.sku_id = tegra20_fuse_early(FUSE_SKU_INFO);
96 else
97 tegra_sku_info.sku_id = tegra30_fuse_readl(FUSE_SKU_INFO);
98 }
99
tegra_init_apbmisc(void)100 void __init tegra_init_apbmisc(void)
101 {
102 struct device_node *np;
103
104 np = of_find_matching_node(NULL, apbmisc_match);
105 apbmisc_base = of_iomap(np, 0);
106 if (!apbmisc_base) {
107 pr_warn("ioremap tegra apbmisc failed. using %08x instead\n",
108 APBMISC_BASE);
109 apbmisc_base = ioremap(APBMISC_BASE, APBMISC_SIZE);
110 }
111
112 strapping_base = of_iomap(np, 1);
113 if (!strapping_base)
114 pr_err("ioremap tegra strapping_base failed\n");
115 }
116