1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2014-2023, NVIDIA CORPORATION. All rights reserved. 4 */ 5 6 #include <linux/export.h> 7 #include <linux/io.h> 8 #include <linux/kernel.h> 9 #include <linux/of.h> 10 #include <linux/of_address.h> 11 12 #include <soc/tegra/common.h> 13 #include <soc/tegra/fuse.h> 14 15 #include "fuse.h" 16 17 #define FUSE_SKU_INFO 0x10 18 19 #define ERD_ERR_CONFIG 0x120c 20 #define ERD_MASK_INBAND_ERR 0x1 21 22 #define PMC_STRAPPING_OPT_A_RAM_CODE_SHIFT 4 23 #define PMC_STRAPPING_OPT_A_RAM_CODE_MASK_LONG \ 24 (0xf << PMC_STRAPPING_OPT_A_RAM_CODE_SHIFT) 25 #define PMC_STRAPPING_OPT_A_RAM_CODE_MASK_SHORT \ 26 (0x3 << PMC_STRAPPING_OPT_A_RAM_CODE_SHIFT) 27 28 static void __iomem *apbmisc_base; 29 static bool long_ram_code; 30 static u32 strapping; 31 static u32 chipid; 32 33 u32 tegra_read_chipid(void) 34 { 35 WARN(!chipid, "Tegra APB MISC not yet available\n"); 36 37 return chipid; 38 } 39 40 u8 tegra_get_chip_id(void) 41 { 42 return (tegra_read_chipid() >> 8) & 0xff; 43 } 44 45 u8 tegra_get_major_rev(void) 46 { 47 return (tegra_read_chipid() >> 4) & 0xf; 48 } 49 50 u8 tegra_get_minor_rev(void) 51 { 52 return (tegra_read_chipid() >> 16) & 0xf; 53 } 54 55 u8 tegra_get_platform(void) 56 { 57 return (tegra_read_chipid() >> 20) & 0xf; 58 } 59 60 bool tegra_is_silicon(void) 61 { 62 switch (tegra_get_chip_id()) { 63 case TEGRA194: 64 case TEGRA234: 65 case TEGRA264: 66 if (tegra_get_platform() == 0) 67 return true; 68 69 return false; 70 } 71 72 /* 73 * Chips prior to Tegra194 have a different way of determining whether 74 * they are silicon or not. Since we never supported simulation on the 75 * older Tegra chips, don't bother extracting the information and just 76 * report that we're running on silicon. 77 */ 78 return true; 79 } 80 81 u32 tegra_read_straps(void) 82 { 83 WARN(!chipid, "Tegra ABP MISC not yet available\n"); 84 85 return strapping; 86 } 87 88 u32 tegra_read_ram_code(void) 89 { 90 u32 straps = tegra_read_straps(); 91 92 if (long_ram_code) 93 straps &= PMC_STRAPPING_OPT_A_RAM_CODE_MASK_LONG; 94 else 95 straps &= PMC_STRAPPING_OPT_A_RAM_CODE_MASK_SHORT; 96 97 return straps >> PMC_STRAPPING_OPT_A_RAM_CODE_SHIFT; 98 } 99 EXPORT_SYMBOL_GPL(tegra_read_ram_code); 100 101 /* 102 * The function sets ERD(Error Response Disable) bit. 103 * This allows to mask inband errors and always send an 104 * OKAY response from CBB to the master which caused error. 105 */ 106 int tegra194_miscreg_mask_serror(void) 107 { 108 if (!apbmisc_base) 109 return -EPROBE_DEFER; 110 111 if (!of_machine_is_compatible("nvidia,tegra194")) { 112 WARN(1, "Only supported for Tegra194 devices!\n"); 113 return -EOPNOTSUPP; 114 } 115 116 writel_relaxed(ERD_MASK_INBAND_ERR, 117 apbmisc_base + ERD_ERR_CONFIG); 118 119 return 0; 120 } 121 EXPORT_SYMBOL(tegra194_miscreg_mask_serror); 122 123 static const struct of_device_id apbmisc_match[] __initconst = { 124 { .compatible = "nvidia,tegra20-apbmisc", }, 125 { .compatible = "nvidia,tegra186-misc", }, 126 { .compatible = "nvidia,tegra194-misc", }, 127 { .compatible = "nvidia,tegra234-misc", }, 128 {}, 129 }; 130 131 void __init tegra_init_revision(void) 132 { 133 u8 chip_id, minor_rev; 134 135 chip_id = tegra_get_chip_id(); 136 minor_rev = tegra_get_minor_rev(); 137 138 switch (minor_rev) { 139 case 1: 140 tegra_sku_info.revision = TEGRA_REVISION_A01; 141 break; 142 case 2: 143 tegra_sku_info.revision = TEGRA_REVISION_A02; 144 break; 145 case 3: 146 if (chip_id == TEGRA20 && (tegra_fuse_read_spare(18) || 147 tegra_fuse_read_spare(19))) 148 tegra_sku_info.revision = TEGRA_REVISION_A03p; 149 else 150 tegra_sku_info.revision = TEGRA_REVISION_A03; 151 break; 152 case 4: 153 tegra_sku_info.revision = TEGRA_REVISION_A04; 154 break; 155 default: 156 tegra_sku_info.revision = TEGRA_REVISION_UNKNOWN; 157 } 158 159 tegra_sku_info.sku_id = tegra_fuse_read_early(FUSE_SKU_INFO); 160 tegra_sku_info.platform = tegra_get_platform(); 161 } 162 163 void __init tegra_init_apbmisc(void) 164 { 165 void __iomem *strapping_base; 166 struct resource apbmisc, straps; 167 struct device_node *np; 168 169 np = of_find_matching_node(NULL, apbmisc_match); 170 if (!np) { 171 /* 172 * Fall back to legacy initialization for 32-bit ARM only. All 173 * 64-bit ARM device tree files for Tegra are required to have 174 * an APBMISC node. 175 * 176 * This is for backwards-compatibility with old device trees 177 * that didn't contain an APBMISC node. 178 */ 179 if (IS_ENABLED(CONFIG_ARM) && soc_is_tegra()) { 180 /* APBMISC registers (chip revision, ...) */ 181 apbmisc.start = 0x70000800; 182 apbmisc.end = 0x70000863; 183 apbmisc.flags = IORESOURCE_MEM; 184 185 /* strapping options */ 186 if (of_machine_is_compatible("nvidia,tegra124")) { 187 straps.start = 0x7000e864; 188 straps.end = 0x7000e867; 189 } else { 190 straps.start = 0x70000008; 191 straps.end = 0x7000000b; 192 } 193 194 straps.flags = IORESOURCE_MEM; 195 196 pr_warn("Using APBMISC region %pR\n", &apbmisc); 197 pr_warn("Using strapping options registers %pR\n", 198 &straps); 199 } else { 200 /* 201 * At this point we're not running on Tegra, so play 202 * nice with multi-platform kernels. 203 */ 204 return; 205 } 206 } else { 207 /* 208 * Extract information from the device tree if we've found a 209 * matching node. 210 */ 211 if (of_address_to_resource(np, 0, &apbmisc) < 0) { 212 pr_err("failed to get APBMISC registers\n"); 213 goto put; 214 } 215 216 if (of_address_to_resource(np, 1, &straps) < 0) { 217 pr_err("failed to get strapping options registers\n"); 218 goto put; 219 } 220 } 221 222 apbmisc_base = ioremap(apbmisc.start, resource_size(&apbmisc)); 223 if (!apbmisc_base) { 224 pr_err("failed to map APBMISC registers\n"); 225 } else { 226 chipid = readl_relaxed(apbmisc_base + 4); 227 } 228 229 strapping_base = ioremap(straps.start, resource_size(&straps)); 230 if (!strapping_base) { 231 pr_err("failed to map strapping options registers\n"); 232 } else { 233 strapping = readl_relaxed(strapping_base); 234 iounmap(strapping_base); 235 } 236 237 long_ram_code = of_property_read_bool(np, "nvidia,long-ram-code"); 238 239 put: 240 of_node_put(np); 241 } 242