1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2014-2023, NVIDIA CORPORATION. All rights reserved. 4 */ 5 6 #include <linux/acpi.h> 7 #include <linux/export.h> 8 #include <linux/io.h> 9 #include <linux/kernel.h> 10 #include <linux/mod_devicetable.h> 11 #include <linux/of.h> 12 #include <linux/of_address.h> 13 14 #include <soc/tegra/common.h> 15 #include <soc/tegra/fuse.h> 16 17 #include "fuse.h" 18 19 #define FUSE_SKU_INFO 0x10 20 21 #define ERD_ERR_CONFIG 0x120c 22 #define ERD_MASK_INBAND_ERR 0x1 23 24 #define PMC_STRAPPING_OPT_A_RAM_CODE_SHIFT 4 25 #define PMC_STRAPPING_OPT_A_RAM_CODE_MASK_LONG \ 26 (0xf << PMC_STRAPPING_OPT_A_RAM_CODE_SHIFT) 27 #define PMC_STRAPPING_OPT_A_RAM_CODE_MASK_SHORT \ 28 (0x3 << PMC_STRAPPING_OPT_A_RAM_CODE_SHIFT) 29 30 static void __iomem *apbmisc_base; 31 static bool long_ram_code; 32 static u32 strapping; 33 static u32 chipid; 34 35 u32 tegra_read_chipid(void) 36 { 37 WARN(!chipid, "Tegra APB MISC not yet available\n"); 38 39 return chipid; 40 } 41 42 u8 tegra_get_chip_id(void) 43 { 44 return (tegra_read_chipid() >> 8) & 0xff; 45 } 46 47 u8 tegra_get_major_rev(void) 48 { 49 return (tegra_read_chipid() >> 4) & 0xf; 50 } 51 52 u8 tegra_get_minor_rev(void) 53 { 54 return (tegra_read_chipid() >> 16) & 0xf; 55 } 56 57 u8 tegra_get_platform(void) 58 { 59 return (tegra_read_chipid() >> 20) & 0xf; 60 } 61 62 bool tegra_is_silicon(void) 63 { 64 switch (tegra_get_chip_id()) { 65 case TEGRA194: 66 case TEGRA234: 67 case TEGRA241: 68 case TEGRA264: 69 if (tegra_get_platform() == 0) 70 return true; 71 72 return false; 73 } 74 75 /* 76 * Chips prior to Tegra194 have a different way of determining whether 77 * they are silicon or not. Since we never supported simulation on the 78 * older Tegra chips, don't bother extracting the information and just 79 * report that we're running on silicon. 80 */ 81 return true; 82 } 83 84 u32 tegra_read_straps(void) 85 { 86 WARN(!chipid, "Tegra ABP MISC not yet available\n"); 87 88 return strapping; 89 } 90 91 u32 tegra_read_ram_code(void) 92 { 93 u32 straps = tegra_read_straps(); 94 95 if (long_ram_code) 96 straps &= PMC_STRAPPING_OPT_A_RAM_CODE_MASK_LONG; 97 else 98 straps &= PMC_STRAPPING_OPT_A_RAM_CODE_MASK_SHORT; 99 100 return straps >> PMC_STRAPPING_OPT_A_RAM_CODE_SHIFT; 101 } 102 EXPORT_SYMBOL_GPL(tegra_read_ram_code); 103 104 /* 105 * The function sets ERD(Error Response Disable) bit. 106 * This allows to mask inband errors and always send an 107 * OKAY response from CBB to the master which caused error. 108 */ 109 int tegra194_miscreg_mask_serror(void) 110 { 111 if (!apbmisc_base) 112 return -EPROBE_DEFER; 113 114 if (!of_machine_is_compatible("nvidia,tegra194")) { 115 WARN(1, "Only supported for Tegra194 devices!\n"); 116 return -EOPNOTSUPP; 117 } 118 119 writel_relaxed(ERD_MASK_INBAND_ERR, 120 apbmisc_base + ERD_ERR_CONFIG); 121 122 return 0; 123 } 124 EXPORT_SYMBOL(tegra194_miscreg_mask_serror); 125 126 static const struct of_device_id apbmisc_match[] __initconst = { 127 { .compatible = "nvidia,tegra20-apbmisc", }, 128 { .compatible = "nvidia,tegra186-misc", }, 129 { .compatible = "nvidia,tegra194-misc", }, 130 { .compatible = "nvidia,tegra234-misc", }, 131 {}, 132 }; 133 134 void __init tegra_init_revision(void) 135 { 136 u8 chip_id, minor_rev; 137 138 chip_id = tegra_get_chip_id(); 139 minor_rev = tegra_get_minor_rev(); 140 141 switch (minor_rev) { 142 case 1: 143 tegra_sku_info.revision = TEGRA_REVISION_A01; 144 break; 145 case 2: 146 tegra_sku_info.revision = TEGRA_REVISION_A02; 147 break; 148 case 3: 149 if (chip_id == TEGRA20 && (tegra_fuse_read_spare(18) || 150 tegra_fuse_read_spare(19))) 151 tegra_sku_info.revision = TEGRA_REVISION_A03p; 152 else 153 tegra_sku_info.revision = TEGRA_REVISION_A03; 154 break; 155 case 4: 156 tegra_sku_info.revision = TEGRA_REVISION_A04; 157 break; 158 default: 159 tegra_sku_info.revision = TEGRA_REVISION_UNKNOWN; 160 } 161 162 tegra_sku_info.sku_id = tegra_fuse_read_early(FUSE_SKU_INFO); 163 tegra_sku_info.platform = tegra_get_platform(); 164 } 165 166 static void tegra_init_apbmisc_resources(struct resource *apbmisc, 167 struct resource *straps) 168 { 169 void __iomem *strapping_base; 170 171 apbmisc_base = ioremap(apbmisc->start, resource_size(apbmisc)); 172 if (apbmisc_base) 173 chipid = readl_relaxed(apbmisc_base + 4); 174 else 175 pr_err("failed to map APBMISC registers\n"); 176 177 strapping_base = ioremap(straps->start, resource_size(straps)); 178 if (strapping_base) { 179 strapping = readl_relaxed(strapping_base); 180 iounmap(strapping_base); 181 } else { 182 pr_err("failed to map strapping options registers\n"); 183 } 184 } 185 186 /** 187 * tegra_init_apbmisc - Initializes Tegra APBMISC and Strapping registers. 188 * 189 * This is called during early init as some of the old 32-bit ARM code needs 190 * information from the APBMISC registers very early during boot. 191 */ 192 void __init tegra_init_apbmisc(void) 193 { 194 struct resource apbmisc, straps; 195 struct device_node *np; 196 197 np = of_find_matching_node(NULL, apbmisc_match); 198 if (!np) { 199 /* 200 * Fall back to legacy initialization for 32-bit ARM only. All 201 * 64-bit ARM device tree files for Tegra are required to have 202 * an APBMISC node. 203 * 204 * This is for backwards-compatibility with old device trees 205 * that didn't contain an APBMISC node. 206 */ 207 if (IS_ENABLED(CONFIG_ARM) && soc_is_tegra()) { 208 /* APBMISC registers (chip revision, ...) */ 209 apbmisc.start = 0x70000800; 210 apbmisc.end = 0x70000863; 211 apbmisc.flags = IORESOURCE_MEM; 212 213 /* strapping options */ 214 if (of_machine_is_compatible("nvidia,tegra124")) { 215 straps.start = 0x7000e864; 216 straps.end = 0x7000e867; 217 } else { 218 straps.start = 0x70000008; 219 straps.end = 0x7000000b; 220 } 221 222 straps.flags = IORESOURCE_MEM; 223 224 pr_warn("Using APBMISC region %pR\n", &apbmisc); 225 pr_warn("Using strapping options registers %pR\n", 226 &straps); 227 } else { 228 /* 229 * At this point we're not running on Tegra, so play 230 * nice with multi-platform kernels. 231 */ 232 return; 233 } 234 } else { 235 /* 236 * Extract information from the device tree if we've found a 237 * matching node. 238 */ 239 if (of_address_to_resource(np, 0, &apbmisc) < 0) { 240 pr_err("failed to get APBMISC registers\n"); 241 goto put; 242 } 243 244 if (of_address_to_resource(np, 1, &straps) < 0) { 245 pr_err("failed to get strapping options registers\n"); 246 goto put; 247 } 248 } 249 250 tegra_init_apbmisc_resources(&apbmisc, &straps); 251 long_ram_code = of_property_read_bool(np, "nvidia,long-ram-code"); 252 253 put: 254 of_node_put(np); 255 } 256 257 #ifdef CONFIG_ACPI 258 static const struct acpi_device_id apbmisc_acpi_match[] = { 259 { "NVDA2010" }, 260 { /* sentinel */ } 261 }; 262 263 void tegra_acpi_init_apbmisc(void) 264 { 265 struct resource *resources[2] = { NULL }; 266 struct resource_entry *rentry; 267 struct acpi_device *adev = NULL; 268 struct list_head resource_list; 269 int rcount = 0; 270 int ret; 271 272 adev = acpi_dev_get_first_match_dev(apbmisc_acpi_match[0].id, NULL, -1); 273 if (!adev) 274 return; 275 276 INIT_LIST_HEAD(&resource_list); 277 278 ret = acpi_dev_get_memory_resources(adev, &resource_list); 279 if (ret < 0) { 280 pr_err("failed to get APBMISC memory resources"); 281 goto out_put_acpi_dev; 282 } 283 284 /* 285 * Get required memory resources. 286 * 287 * resources[0]: apbmisc. 288 * resources[1]: straps. 289 */ 290 resource_list_for_each_entry(rentry, &resource_list) { 291 if (rcount >= ARRAY_SIZE(resources)) 292 break; 293 294 resources[rcount++] = rentry->res; 295 } 296 297 if (!resources[0]) { 298 pr_err("failed to get APBMISC registers\n"); 299 goto out_free_resource_list; 300 } 301 302 if (!resources[1]) { 303 pr_err("failed to get strapping options registers\n"); 304 goto out_free_resource_list; 305 } 306 307 tegra_init_apbmisc_resources(resources[0], resources[1]); 308 309 out_free_resource_list: 310 acpi_dev_free_resource_list(&resource_list); 311 312 out_put_acpi_dev: 313 acpi_dev_put(adev); 314 } 315 #else 316 void tegra_acpi_init_apbmisc(void) 317 { 318 } 319 #endif 320