Angel Pons | 80d9238 | 2020-04-05 15:47:00 +0200 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
Mariusz Szafranski | a404133 | 2017-08-02 17:28:17 +0200 | [diff] [blame] | 2 | |
Michael Niewöhner | 46e68ac | 2019-11-04 22:07:29 +0100 | [diff] [blame] | 3 | #include <cbmem.h> |
Mariusz Szafranski | a404133 | 2017-08-02 17:28:17 +0200 | [diff] [blame] | 4 | #include <console/console.h> |
Kyösti Mälkki | 13f6650 | 2019-03-03 08:01:05 +0200 | [diff] [blame] | 5 | #include <device/mmio.h> |
Kyösti Mälkki | f1b58b7 | 2019-03-01 13:43:02 +0200 | [diff] [blame] | 6 | #include <device/pci_ops.h> |
Mariusz Szafranski | a404133 | 2017-08-02 17:28:17 +0200 | [diff] [blame] | 7 | #include <stdint.h> |
| 8 | #include <delay.h> |
| 9 | #include <device/device.h> |
| 10 | #include <device/pci.h> |
| 11 | #include <device/pci_ids.h> |
Mariusz Szafranski | a404133 | 2017-08-02 17:28:17 +0200 | [diff] [blame] | 12 | #include <timer.h> |
| 13 | |
| 14 | #include <soc/iomap.h> |
| 15 | #include <soc/pci_devs.h> |
| 16 | #include <soc/ramstage.h> |
| 17 | #include <soc/systemagent.h> |
Julien Viard de Galbert | a0e5046 | 2018-04-05 11:59:07 +0200 | [diff] [blame] | 18 | #include <soc/acpi.h> |
Mariusz Szafranski | a404133 | 2017-08-02 17:28:17 +0200 | [diff] [blame] | 19 | |
| 20 | #define _1ms 1 |
| 21 | #define WAITING_STEP 100 |
| 22 | |
Elyes HAOUAS | 2ec4183 | 2018-05-27 17:40:58 +0200 | [diff] [blame] | 23 | static int get_pcie_bar(struct device *dev, unsigned int index, u32 *base, |
| 24 | u32 *len) |
Mariusz Szafranski | a404133 | 2017-08-02 17:28:17 +0200 | [diff] [blame] | 25 | { |
| 26 | u32 pciexbar_reg; |
| 27 | |
| 28 | *base = 0; |
| 29 | *len = 0; |
| 30 | |
| 31 | pciexbar_reg = pci_read_config32(dev, index); |
| 32 | |
| 33 | if (!(pciexbar_reg & (1 << 0))) |
| 34 | return 0; |
| 35 | |
| 36 | switch ((pciexbar_reg >> 1) & 3) { |
| 37 | case 0: /* 256MB */ |
| 38 | *base = pciexbar_reg & |
| 39 | ((1 << 31) | (1 << 30) | (1 << 29) | (1 << 28)); |
| 40 | *len = 256 * 1024 * 1024; |
| 41 | return 1; |
| 42 | case 1: /* 128M */ |
| 43 | *base = pciexbar_reg & ((1 << 31) | (1 << 30) | (1 << 29) | |
| 44 | (1 << 28) | (1 << 27)); |
| 45 | *len = 128 * 1024 * 1024; |
| 46 | return 1; |
| 47 | case 2: /* 64M */ |
| 48 | *base = pciexbar_reg & ((1 << 31) | (1 << 30) | (1 << 29) | |
| 49 | (1 << 28) | (1 << 27) | (1 << 26)); |
| 50 | *len = 64 * 1024 * 1024; |
| 51 | return 1; |
| 52 | } |
| 53 | |
| 54 | return 0; |
| 55 | } |
| 56 | |
Elyes HAOUAS | 2ec4183 | 2018-05-27 17:40:58 +0200 | [diff] [blame] | 57 | static int get_bar(struct device *dev, unsigned int index, u32 *base, u32 *len) |
Mariusz Szafranski | a404133 | 2017-08-02 17:28:17 +0200 | [diff] [blame] | 58 | { |
| 59 | u32 bar; |
| 60 | |
| 61 | bar = pci_read_config32(dev, index); |
| 62 | |
| 63 | /* If not enabled don't report it. */ |
| 64 | if (!(bar & 0x1)) |
| 65 | return 0; |
| 66 | |
| 67 | /* Knock down the enable bit. */ |
| 68 | *base = bar & ~1; |
| 69 | |
| 70 | return 1; |
| 71 | } |
| 72 | |
| 73 | struct fixed_mmio_descriptor { |
| 74 | unsigned int index; |
| 75 | u32 size; |
Elyes HAOUAS | 2ec4183 | 2018-05-27 17:40:58 +0200 | [diff] [blame] | 76 | int (*get_resource)(struct device *dev, unsigned int index, u32 *base, |
Mariusz Szafranski | a404133 | 2017-08-02 17:28:17 +0200 | [diff] [blame] | 77 | u32 *size); |
| 78 | const char *description; |
| 79 | }; |
| 80 | |
| 81 | struct fixed_mmio_descriptor mc_fixed_resources[] = { |
| 82 | {PCIEXBAR, 0, get_pcie_bar, "PCIEXBAR"}, |
| 83 | {MCHBAR, MCH_BASE_SIZE, get_bar, "MCHBAR"}, |
| 84 | }; |
| 85 | |
| 86 | /* |
| 87 | * Add all known fixed MMIO ranges that hang off the host bridge/memory |
| 88 | * controller device. |
| 89 | */ |
Elyes HAOUAS | 2ec4183 | 2018-05-27 17:40:58 +0200 | [diff] [blame] | 90 | static void mc_add_fixed_mmio_resources(struct device *dev) |
Mariusz Szafranski | a404133 | 2017-08-02 17:28:17 +0200 | [diff] [blame] | 91 | { |
| 92 | int i; |
| 93 | |
| 94 | for (i = 0; i < ARRAY_SIZE(mc_fixed_resources); i++) { |
| 95 | u32 base; |
| 96 | u32 size; |
| 97 | struct resource *resource; |
| 98 | unsigned int index; |
| 99 | |
| 100 | size = mc_fixed_resources[i].size; |
| 101 | index = mc_fixed_resources[i].index; |
| 102 | if (!mc_fixed_resources[i].get_resource(dev, index, &base, |
| 103 | &size)) |
| 104 | continue; |
| 105 | |
| 106 | resource = new_resource(dev, mc_fixed_resources[i].index); |
| 107 | resource->flags = IORESOURCE_MEM | IORESOURCE_FIXED | |
| 108 | IORESOURCE_STORED | IORESOURCE_RESERVE | |
| 109 | IORESOURCE_ASSIGNED; |
| 110 | resource->base = base; |
| 111 | resource->size = size; |
| 112 | printk(BIOS_DEBUG, "%s: Adding %s @ %x 0x%08lx-0x%08lx.\n", |
| 113 | __func__, mc_fixed_resources[i].description, index, |
| 114 | (unsigned long)base, (unsigned long)(base + size - 1)); |
| 115 | } |
| 116 | } |
| 117 | |
| 118 | struct map_entry { |
| 119 | int reg; |
| 120 | int is_64_bit; |
| 121 | int is_limit; |
| 122 | const char *description; |
| 123 | }; |
| 124 | |
Elyes HAOUAS | 2ec4183 | 2018-05-27 17:40:58 +0200 | [diff] [blame] | 125 | static void read_map_entry(struct device *dev, struct map_entry *entry, |
Mariusz Szafranski | a404133 | 2017-08-02 17:28:17 +0200 | [diff] [blame] | 126 | uint64_t *result) |
| 127 | { |
| 128 | uint64_t value; |
| 129 | uint64_t mask; |
| 130 | |
| 131 | /* All registers are on a 1MiB granularity. */ |
| 132 | mask = ((1ULL << 20) - 1); |
| 133 | mask = ~mask; |
| 134 | |
| 135 | value = 0; |
| 136 | |
| 137 | if (entry->is_64_bit) { |
| 138 | value = pci_read_config32(dev, entry->reg + 4); |
| 139 | value <<= 32; |
| 140 | } |
| 141 | |
| 142 | value |= (uint64_t)pci_read_config32(dev, entry->reg); |
| 143 | value &= mask; |
| 144 | |
| 145 | if (entry->is_limit) |
| 146 | value |= ~mask; |
| 147 | |
| 148 | *result = value; |
| 149 | } |
| 150 | |
| 151 | #define MAP_ENTRY(reg_, is_64_, is_limit_, desc_) \ |
| 152 | { \ |
| 153 | .reg = reg_, .is_64_bit = is_64_, .is_limit = is_limit_, \ |
| 154 | .description = desc_, \ |
| 155 | } |
| 156 | |
| 157 | #define MAP_ENTRY_BASE_64(reg_, desc_) MAP_ENTRY(reg_, 1, 0, desc_) |
| 158 | #define MAP_ENTRY_LIMIT_64(reg_, desc_) MAP_ENTRY(reg_, 1, 1, desc_) |
| 159 | #define MAP_ENTRY_BASE_32(reg_, desc_) MAP_ENTRY(reg_, 0, 0, desc_) |
| 160 | |
| 161 | enum { |
| 162 | TOUUD_REG, |
| 163 | TOLUD_REG, |
| 164 | TSEG_REG, |
| 165 | /* Must be last. */ |
| 166 | NUM_MAP_ENTRIES |
| 167 | }; |
| 168 | |
| 169 | static struct map_entry memory_map[NUM_MAP_ENTRIES] = { |
| 170 | [TOUUD_REG] = MAP_ENTRY_BASE_64(TOUUD, "TOUUD"), |
| 171 | [TOLUD_REG] = MAP_ENTRY_BASE_32(TOLUD, "TOLUD"), |
| 172 | [TSEG_REG] = MAP_ENTRY_BASE_32(TSEGMB, "TSEGMB"), |
| 173 | }; |
| 174 | |
Elyes HAOUAS | 2ec4183 | 2018-05-27 17:40:58 +0200 | [diff] [blame] | 175 | static void mc_read_map_entries(struct device *dev, uint64_t *values) |
Mariusz Szafranski | a404133 | 2017-08-02 17:28:17 +0200 | [diff] [blame] | 176 | { |
| 177 | int i; |
| 178 | for (i = 0; i < NUM_MAP_ENTRIES; i++) |
| 179 | read_map_entry(dev, &memory_map[i], &values[i]); |
| 180 | } |
| 181 | |
Elyes HAOUAS | 2ec4183 | 2018-05-27 17:40:58 +0200 | [diff] [blame] | 182 | static void mc_report_map_entries(struct device *dev, uint64_t *values) |
Mariusz Szafranski | a404133 | 2017-08-02 17:28:17 +0200 | [diff] [blame] | 183 | { |
| 184 | int i; |
| 185 | for (i = 0; i < NUM_MAP_ENTRIES; i++) { |
| 186 | printk(BIOS_DEBUG, "MC MAP: %s: 0x%llx\n", |
| 187 | memory_map[i].description, values[i]); |
| 188 | } |
| 189 | } |
| 190 | |
Elyes HAOUAS | 2ec4183 | 2018-05-27 17:40:58 +0200 | [diff] [blame] | 191 | static void mc_add_dram_resources(struct device *dev) |
Mariusz Szafranski | a404133 | 2017-08-02 17:28:17 +0200 | [diff] [blame] | 192 | { |
| 193 | unsigned long base_k, size_k; |
| 194 | unsigned long touud_k; |
| 195 | unsigned long index; |
| 196 | struct resource *resource; |
| 197 | uint64_t mc_values[NUM_MAP_ENTRIES]; |
Michael Niewöhner | 46e68ac | 2019-11-04 22:07:29 +0100 | [diff] [blame] | 198 | uintptr_t top_of_ram; |
Mariusz Szafranski | a404133 | 2017-08-02 17:28:17 +0200 | [diff] [blame] | 199 | |
| 200 | /* Read in the MAP registers and report their values. */ |
| 201 | mc_read_map_entries(dev, &mc_values[0]); |
| 202 | mc_report_map_entries(dev, &mc_values[0]); |
| 203 | |
| 204 | /* |
| 205 | * These are the host memory ranges that should be added: |
| 206 | * - 0 -> 0xa0000: cacheable |
| 207 | * - 0xc0000 -> 0x100000 : reserved |
| 208 | * - 0x100000 -> top_of_ram : cacheable |
| 209 | * - top_of_ram -> TSEG: uncacheable |
| 210 | * - TESG -> TOLUD: cacheable with standard MTRRs and reserved |
| 211 | * - 4GiB -> TOUUD: cacheable |
| 212 | * |
| 213 | * The default SMRAM space is reserved so that the range doesn't |
| 214 | * have to be saved during S3 Resume. Once marked reserved the OS |
| 215 | * cannot use the memory. This is a bit of an odd place to reserve |
| 216 | * the region, but the CPU devices don't have dev_ops->read_resources() |
| 217 | * called on them. |
| 218 | * |
| 219 | * The range 0xa0000 -> 0xc0000 does not have any resources |
| 220 | * associated with it to handle legacy VGA memory. If this range |
| 221 | * is not omitted the mtrr code will setup the area as cacheable |
| 222 | * causing VGA access to not work. |
| 223 | * |
| 224 | * The TSEG region is mapped as cacheable so that one can perform |
| 225 | * SMRAM relocation faster. Once the SMRR is enabled the SMRR takes |
| 226 | * precedence over the existing MTRRs covering this region. |
| 227 | * |
| 228 | * It should be noted that cacheable entry types need to be added in |
| 229 | * order. The reason is that the current MTRR code assumes this and |
| 230 | * falls over itself if it isn't. |
| 231 | * |
| 232 | * The resource index starts low and should not meet or exceed |
| 233 | * PCI_BASE_ADDRESS_0. |
| 234 | */ |
| 235 | index = 0; |
Michael Niewöhner | 46e68ac | 2019-11-04 22:07:29 +0100 | [diff] [blame] | 236 | top_of_ram = (uintptr_t)cbmem_top(); |
Mariusz Szafranski | a404133 | 2017-08-02 17:28:17 +0200 | [diff] [blame] | 237 | |
| 238 | /* 0 - > 0xa0000 */ |
| 239 | base_k = 0; |
| 240 | size_k = (0xa0000 >> 10) - base_k; |
| 241 | ram_resource(dev, index++, base_k, size_k); |
| 242 | |
| 243 | /* 0x100000 -> top_of_ram */ |
| 244 | base_k = 0x100000 >> 10; |
Michael Niewöhner | 46e68ac | 2019-11-04 22:07:29 +0100 | [diff] [blame] | 245 | size_k = (top_of_ram >> 10) - base_k; |
Mariusz Szafranski | a404133 | 2017-08-02 17:28:17 +0200 | [diff] [blame] | 246 | ram_resource(dev, index++, base_k, size_k); |
| 247 | |
| 248 | /* top_of_ram -> TSEG */ |
| 249 | resource = new_resource(dev, index++); |
Michael Niewöhner | 46e68ac | 2019-11-04 22:07:29 +0100 | [diff] [blame] | 250 | resource->base = top_of_ram; |
Mariusz Szafranski | a404133 | 2017-08-02 17:28:17 +0200 | [diff] [blame] | 251 | resource->size = mc_values[TSEG_REG] - resource->base; |
| 252 | resource->flags = IORESOURCE_MEM | IORESOURCE_FIXED | |
| 253 | IORESOURCE_STORED | IORESOURCE_RESERVE | |
| 254 | IORESOURCE_ASSIGNED; |
| 255 | |
| 256 | /* TSEG -> TOLUD */ |
| 257 | resource = new_resource(dev, index++); |
| 258 | resource->base = mc_values[TSEG_REG]; |
| 259 | resource->size = mc_values[TOLUD_REG] - resource->base; |
| 260 | resource->flags = IORESOURCE_MEM | IORESOURCE_FIXED | |
| 261 | IORESOURCE_STORED | IORESOURCE_RESERVE | |
| 262 | IORESOURCE_ASSIGNED | IORESOURCE_CACHEABLE; |
| 263 | printk(BIOS_DEBUG, |
| 264 | "SMM memory location: 0x%llx SMM memory size: 0x%llx\n", |
| 265 | resource->base, resource->size); |
| 266 | |
| 267 | /* 4GiB -> TOUUD */ |
| 268 | base_k = 4096 * 1024; /* 4GiB */ |
| 269 | touud_k = mc_values[TOUUD_REG] >> 10; |
| 270 | size_k = touud_k - base_k; |
| 271 | if (touud_k > base_k) |
| 272 | ram_resource(dev, index++, base_k, size_k); |
| 273 | |
| 274 | /* |
| 275 | * Reserve everything between A segment and 1MB: |
| 276 | * |
| 277 | * 0xa0000 - 0xbffff: legacy VGA |
| 278 | * 0xc0000 - 0xfffff: reserved RAM |
| 279 | */ |
| 280 | mmio_resource(dev, index++, (0xa0000 >> 10), (0xc0000 - 0xa0000) >> 10); |
| 281 | reserved_ram_resource(dev, index++, (0xc0000 >> 10), |
| 282 | (0x100000 - 0xc0000) >> 10); |
| 283 | } |
| 284 | |
Elyes HAOUAS | 2ec4183 | 2018-05-27 17:40:58 +0200 | [diff] [blame] | 285 | static void systemagent_read_resources(struct device *dev) |
Mariusz Szafranski | a404133 | 2017-08-02 17:28:17 +0200 | [diff] [blame] | 286 | { |
| 287 | /* Read standard PCI resources. */ |
| 288 | pci_dev_read_resources(dev); |
| 289 | |
| 290 | /* Add all fixed MMIO resources. */ |
| 291 | mc_add_fixed_mmio_resources(dev); |
| 292 | |
| 293 | /* Calculate and add DRAM resources. */ |
| 294 | mc_add_dram_resources(dev); |
| 295 | } |
| 296 | |
| 297 | static void systemagent_init(struct device *dev) |
| 298 | { |
| 299 | struct stopwatch sw; |
| 300 | void *bios_reset_cpl = |
| 301 | (void *)(DEFAULT_MCHBAR + MCH_BAR_BIOS_RESET_CPL); |
| 302 | uint32_t reg = read32(bios_reset_cpl); |
| 303 | |
| 304 | /* Stage0 BIOS Reset Complete (RST_CPL) */ |
| 305 | reg |= RST_CPL_BIT; |
| 306 | write32(bios_reset_cpl, reg); |
| 307 | |
| 308 | /* |
| 309 | * Poll for bit 8 in same reg (RST_CPL). |
| 310 | * We wait here till 1 ms for the bit to get set. |
| 311 | */ |
| 312 | stopwatch_init_msecs_expire(&sw, _1ms); |
| 313 | while (!(read32(bios_reset_cpl) & PCODE_INIT_DONE)) { |
| 314 | if (stopwatch_expired(&sw)) { |
| 315 | printk(BIOS_DEBUG, "Failed to set RST_CPL bit\n"); |
| 316 | return; |
| 317 | } |
| 318 | udelay(WAITING_STEP); |
| 319 | } |
| 320 | printk(BIOS_DEBUG, "Set BIOS_RESET_CPL\n"); |
| 321 | } |
| 322 | |
| 323 | static struct device_operations systemagent_ops = { |
Elyes HAOUAS | 1d19127 | 2018-11-27 12:23:48 +0100 | [diff] [blame] | 324 | .read_resources = systemagent_read_resources, |
| 325 | .set_resources = pci_dev_set_resources, |
| 326 | .enable_resources = pci_dev_enable_resources, |
| 327 | .init = systemagent_init, |
Mariusz Szafranski | a404133 | 2017-08-02 17:28:17 +0200 | [diff] [blame] | 328 | .ops_pci = &soc_pci_ops, |
Julien Viard de Galbert | a0e5046 | 2018-04-05 11:59:07 +0200 | [diff] [blame] | 329 | #if CONFIG(HAVE_ACPI_TABLES) |
| 330 | .write_acpi_tables = systemagent_write_acpi_tables, |
| 331 | #endif |
Mariusz Szafranski | a404133 | 2017-08-02 17:28:17 +0200 | [diff] [blame] | 332 | }; |
| 333 | |
| 334 | /* IDs for System Agent device of Intel Denverton SoC */ |
| 335 | static const unsigned short systemagent_ids[] = { |
Jeff Daly | 2a81cab | 2022-01-06 16:32:11 -0500 | [diff] [blame^] | 336 | PCI_DEVICE_ID_INTEL_DNV_SA, |
| 337 | PCI_DEVICE_ID_INTEL_DNVAD_SA, |
Mariusz Szafranski | a404133 | 2017-08-02 17:28:17 +0200 | [diff] [blame] | 338 | 0 |
| 339 | }; |
| 340 | |
| 341 | static const struct pci_driver systemagent_driver __pci_driver = { |
| 342 | .ops = &systemagent_ops, |
| 343 | .vendor = PCI_VENDOR_ID_INTEL, |
| 344 | .devices = systemagent_ids |
| 345 | }; |