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
31static void __iomem *apbmisc_base;
32static void __iomem *strapping_base;
33
34u32 tegra_read_chipid(void)
35{
36	return readl_relaxed(apbmisc_base + 4);
37}
38
39u8 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
49u32 tegra_read_straps(void)
50{
51	if (strapping_base)
52		return readl_relaxed(strapping_base);
53	else
54		return 0;
55}
56
57static const struct of_device_id apbmisc_match[] __initconst = {
58	{ .compatible = "nvidia,tegra20-apbmisc", },
59	{},
60};
61
62void __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
100void __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