2 * Copyright (c) 2014, NVIDIA CORPORATION. All rights reserved.
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.
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
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/>.
18 #include <linux/kernel.h>
20 #include <linux/of_address.h>
23 #include <soc/tegra/fuse.h>
24 #include <soc/tegra/common.h>
28 #define FUSE_SKU_INFO 0x10
30 #define PMC_STRAPPING_OPT_A_RAM_CODE_SHIFT 4
31 #define PMC_STRAPPING_OPT_A_RAM_CODE_MASK_LONG \
32 (0xf << PMC_STRAPPING_OPT_A_RAM_CODE_SHIFT)
33 #define PMC_STRAPPING_OPT_A_RAM_CODE_MASK_SHORT \
34 (0x3 << PMC_STRAPPING_OPT_A_RAM_CODE_SHIFT)
36 static void __iomem *apbmisc_base;
37 static void __iomem *strapping_base;
38 static bool long_ram_code;
40 u32 tegra_read_chipid(void)
43 WARN(1, "Tegra Chip ID not yet available\n");
47 return readl_relaxed(apbmisc_base + 4);
50 u8 tegra_get_chip_id(void)
52 return (tegra_read_chipid() >> 8) & 0xff;
55 u32 tegra_read_straps(void)
58 return readl_relaxed(strapping_base);
63 u32 tegra_read_ram_code(void)
65 u32 straps = tegra_read_straps();
68 straps &= PMC_STRAPPING_OPT_A_RAM_CODE_MASK_LONG;
70 straps &= PMC_STRAPPING_OPT_A_RAM_CODE_MASK_SHORT;
72 return straps >> PMC_STRAPPING_OPT_A_RAM_CODE_SHIFT;
75 static const struct of_device_id apbmisc_match[] __initconst = {
76 { .compatible = "nvidia,tegra20-apbmisc", },
77 { .compatible = "nvidia,tegra186-misc", },
81 void __init tegra_init_revision(void)
83 u32 id, chip_id, minor_rev;
86 id = tegra_read_chipid();
87 chip_id = (id >> 8) & 0xff;
88 minor_rev = (id >> 16) & 0xf;
92 rev = TEGRA_REVISION_A01;
95 rev = TEGRA_REVISION_A02;
98 if (chip_id == TEGRA20 && (tegra_fuse_read_spare(18) ||
99 tegra_fuse_read_spare(19)))
100 rev = TEGRA_REVISION_A03p;
102 rev = TEGRA_REVISION_A03;
105 rev = TEGRA_REVISION_A04;
108 rev = TEGRA_REVISION_UNKNOWN;
111 tegra_sku_info.revision = rev;
113 tegra_sku_info.sku_id = tegra_fuse_read_early(FUSE_SKU_INFO);
116 void __init tegra_init_apbmisc(void)
118 struct resource apbmisc, straps;
119 struct device_node *np;
121 np = of_find_matching_node(NULL, apbmisc_match);
124 * Fall back to legacy initialization for 32-bit ARM only. All
125 * 64-bit ARM device tree files for Tegra are required to have
128 * This is for backwards-compatibility with old device trees
129 * that didn't contain an APBMISC node.
131 if (IS_ENABLED(CONFIG_ARM) && soc_is_tegra()) {
132 /* APBMISC registers (chip revision, ...) */
133 apbmisc.start = 0x70000800;
134 apbmisc.end = 0x70000863;
135 apbmisc.flags = IORESOURCE_MEM;
137 /* strapping options */
138 if (of_machine_is_compatible("nvidia,tegra124")) {
139 straps.start = 0x7000e864;
140 straps.end = 0x7000e867;
142 straps.start = 0x70000008;
143 straps.end = 0x7000000b;
146 straps.flags = IORESOURCE_MEM;
148 pr_warn("Using APBMISC region %pR\n", &apbmisc);
149 pr_warn("Using strapping options registers %pR\n",
153 * At this point we're not running on Tegra, so play
154 * nice with multi-platform kernels.
160 * Extract information from the device tree if we've found a
163 if (of_address_to_resource(np, 0, &apbmisc) < 0) {
164 pr_err("failed to get APBMISC registers\n");
168 if (of_address_to_resource(np, 1, &straps) < 0) {
169 pr_err("failed to get strapping options registers\n");
174 apbmisc_base = ioremap_nocache(apbmisc.start, resource_size(&apbmisc));
176 pr_err("failed to map APBMISC registers\n");
178 strapping_base = ioremap_nocache(straps.start, resource_size(&straps));
180 pr_err("failed to map strapping options registers\n");
182 long_ram_code = of_property_read_bool(np, "nvidia,long-ram-code");