Patrick Rudolph | d0c6797 | 2018-04-17 13:47:55 +0200 | [diff] [blame] | 1 | /* |
| 2 | * This file is part of the coreboot project. |
| 3 | * |
| 4 | * Copyright 2018 Facebook, Inc. |
| 5 | * Copyright 2003-2017 Cavium Inc. <support@cavium.com> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; version 2 of the License. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * Derived from Cavium's BSD-3 Clause OCTEONTX-SDK-6.2.0. |
| 17 | */ |
| 18 | |
| 19 | #include <console/console.h> |
| 20 | #include <arch/io.h> |
| 21 | #include <device/pci.h> |
| 22 | #include <device/pci_ops.h> |
| 23 | #include <soc/addressmap.h> |
| 24 | #include <soc/cavium/common/pci/chip.h> |
| 25 | #include <assert.h> |
| 26 | |
| 27 | #define CAVM_PCCPF_XXX_VSEC_CTL 0x108 |
| 28 | #define CAVM_PCCPF_XXX_VSEC_SCTL 0x10c |
| 29 | |
| 30 | /* |
| 31 | * Hide PCI device function on BUS 1 in non secure world. |
| 32 | */ |
| 33 | static void disable_func(unsigned int devfn) |
| 34 | { |
| 35 | u64 *addr; |
| 36 | printk(BIOS_DEBUG, "PCI: 01:%02x.%x is secure\n", devfn >> 3, |
| 37 | devfn & 7); |
| 38 | |
| 39 | /* disable function */ |
| 40 | addr = (void *)ECAM0_RSLX_SDIS; |
| 41 | u64 reg = read64(&addr[devfn]); |
| 42 | reg &= ~3; |
| 43 | reg |= 2; |
| 44 | write64(&addr[devfn], reg); |
| 45 | } |
| 46 | |
| 47 | /* |
| 48 | * Show PCI device function on BUS 1 in non secure world. |
| 49 | */ |
| 50 | static void enable_func(unsigned int devfn) |
| 51 | { |
| 52 | u64 *addr; |
| 53 | |
| 54 | printk(BIOS_DEBUG, "PCI: 01:%02x.%x is insecure\n", devfn >> 3, |
| 55 | devfn & 7); |
| 56 | |
| 57 | /* enable function */ |
| 58 | addr = (void *)ECAM0_RSLX_SDIS; |
| 59 | u64 reg = read64(&addr[devfn]); |
| 60 | reg &= ~3; |
| 61 | write64(&addr[devfn], reg); |
| 62 | |
| 63 | addr = (void *)ECAM0_RSLX_NSDIS; |
| 64 | reg = read64(&addr[devfn]); |
| 65 | reg &= ~1; |
| 66 | write64(&addr[devfn], reg); |
| 67 | } |
| 68 | |
| 69 | /* |
| 70 | * Hide PCI device on BUS 0 in non secure world. |
| 71 | */ |
| 72 | static void disable_device(unsigned int dev) |
| 73 | { |
| 74 | u64 *addr; |
| 75 | |
| 76 | printk(BIOS_DEBUG, "PCI: 00:%02x.0 is secure\n", dev); |
| 77 | |
| 78 | /* disable function */ |
| 79 | addr = (void *)ECAM0_DEVX_SDIS; |
| 80 | u64 reg = read64(&addr[dev]); |
| 81 | reg &= ~3; |
| 82 | write64(&addr[dev], reg); |
| 83 | |
| 84 | addr = (void *)ECAM0_DEVX_NSDIS; |
| 85 | reg = read64(&addr[dev]); |
| 86 | reg |= 1; |
| 87 | write64(&addr[dev], reg); |
| 88 | } |
| 89 | |
| 90 | /* |
| 91 | * Show PCI device on BUS 0 in non secure world. |
| 92 | */ |
| 93 | static void enable_device(unsigned int dev) |
| 94 | { |
| 95 | u64 *addr; |
| 96 | |
| 97 | printk(BIOS_DEBUG, "PCI: 00:%02x.0 is insecure\n", dev); |
| 98 | |
| 99 | /* enable function */ |
| 100 | addr = (void *)ECAM0_DEVX_SDIS; |
| 101 | u64 reg = read64(&addr[dev]); |
| 102 | reg &= ~3; |
| 103 | write64(&addr[dev], reg); |
| 104 | |
| 105 | addr = (void *)ECAM0_DEVX_NSDIS; |
| 106 | reg = read64(&addr[dev]); |
| 107 | reg &= ~1; |
| 108 | write64(&addr[dev], reg); |
| 109 | } |
| 110 | |
| 111 | static void ecam0_read_resources(struct device *dev) |
| 112 | { |
| 113 | /* There are no dynamic PCI resources on Cavium SoC */ |
| 114 | } |
| 115 | |
| 116 | static void ecam0_fix_missing_devices(struct bus *link) |
| 117 | { |
| 118 | size_t i; |
| 119 | |
| 120 | /** |
| 121 | * Cavium thinks it's a good idea to violate the PCI spec. |
| 122 | * Disabled multi-function PCI devices might have active functions. |
| 123 | * Add devices here manually, as coreboot's PCI allocator won't find |
| 124 | * them otherwise... |
| 125 | */ |
| 126 | for (i = 0; i <= PCI_DEVFN(0x1f, 7); i++) { |
| 127 | struct device_path pci_path; |
| 128 | struct device *child; |
| 129 | |
| 130 | pci_path.type = DEVICE_PATH_PCI; |
| 131 | pci_path.pci.devfn = i; |
| 132 | |
| 133 | child = find_dev_path(link, &pci_path); |
| 134 | if (!child) |
| 135 | pci_probe_dev(NULL, link, i); |
| 136 | } |
| 137 | } |
| 138 | |
| 139 | /** |
| 140 | * Get PCI BAR address from cavium specific extended capability. |
| 141 | * Use regular BAR if not found in extended capability space. |
| 142 | * |
| 143 | * @return The pyhsical address of the BAR, zero on error |
| 144 | */ |
| 145 | static uint64_t get_bar_val(struct device *dev, u8 bar) |
| 146 | { |
| 147 | size_t cap_offset = pci_find_capability(dev, 0x14); |
| 148 | uint64_t h, l, ret = 0; |
| 149 | if (cap_offset) { |
| 150 | /* Found EA */ |
| 151 | u8 es, bei; |
| 152 | u8 ne = pci_read_config8(dev, cap_offset + 2) & 0x3f; |
| 153 | |
| 154 | cap_offset += 4; |
| 155 | while (ne) { |
| 156 | uint32_t dw0 = pci_read_config32(dev, cap_offset); |
| 157 | |
| 158 | es = dw0 & 7; |
| 159 | bei = (dw0 >> 4) & 0xf; |
| 160 | if (bei == bar) { |
| 161 | h = 0; |
| 162 | l = pci_read_config32(dev, cap_offset + 4); |
| 163 | if (l & 2) |
| 164 | h = pci_read_config32(dev, |
| 165 | cap_offset + 12); |
| 166 | ret = (h << 32) | (l & ~0xfull); |
| 167 | break; |
| 168 | } |
| 169 | cap_offset += (es + 1) * 4; |
| 170 | ne--; |
| 171 | } |
| 172 | } else { |
| 173 | h = 0; |
| 174 | l = pci_read_config32(dev, bar * 4 + PCI_BASE_ADDRESS_0); |
| 175 | if (l & 4) |
| 176 | h = pci_read_config32(dev, bar * 4 + PCI_BASE_ADDRESS_0 |
| 177 | + 4); |
| 178 | ret = (h << 32) | (l & ~0xfull); |
| 179 | } |
| 180 | return ret; |
| 181 | } |
| 182 | |
| 183 | /** |
| 184 | * pci_enable_msix - configure device's MSI-X capability structure |
| 185 | * @dev: pointer to the pci_dev data structure of MSI-X device function |
| 186 | * @entries: pointer to an array of MSI-X entries |
| 187 | * @nvec: number of MSI-X irqs requested for allocation by device driver |
| 188 | * |
| 189 | * Setup the MSI-X capability structure of device function with the number |
| 190 | * of requested irqs upon its software driver call to request for |
| 191 | * MSI-X mode enabled on its hardware device function. A return of zero |
| 192 | * indicates the successful configuration of MSI-X capability structure. |
| 193 | * A return of < 0 indicates a failure. |
| 194 | * Or a return of > 0 indicates that driver request is exceeding the number |
| 195 | * of irqs or MSI-X vectors available. Driver should use the returned value to |
| 196 | * re-send its request. |
| 197 | **/ |
| 198 | static size_t ecam0_pci_enable_msix(struct device *dev, |
| 199 | struct msix_entry *entries, size_t nvec) |
| 200 | { |
| 201 | struct msix_entry *msixtable; |
| 202 | u32 offset; |
| 203 | u8 bar_idx; |
| 204 | u64 bar; |
| 205 | size_t nr_entries; |
| 206 | size_t i; |
| 207 | u16 control; |
| 208 | |
| 209 | if (!entries) { |
| 210 | printk(BIOS_ERR, "%s: No entries specified\n", __func__); |
| 211 | return -1; |
| 212 | } |
| 213 | |
| 214 | const size_t pos = pci_find_capability(dev, PCI_CAP_ID_MSIX); |
| 215 | if (!pos) { |
| 216 | printk(BIOS_ERR, "%s: Device not MSI-X capable\n", |
| 217 | dev_path(dev)); |
| 218 | return -1; |
| 219 | } |
| 220 | nr_entries = pci_msix_table_size(dev); |
| 221 | if (nvec > nr_entries) { |
| 222 | printk(BIOS_ERR, "ERROR: %s: Specified to many table entries\n", |
| 223 | dev_path(dev)); |
| 224 | return nr_entries; |
| 225 | } |
| 226 | |
| 227 | /* Ensure MSI-X is disabled while it is set up */ |
| 228 | control = pci_read_config16(dev, pos + PCI_MSIX_FLAGS); |
| 229 | control &= ~PCI_MSIX_FLAGS_ENABLE; |
| 230 | pci_write_config16(dev, pos + PCI_MSIX_FLAGS, control); |
| 231 | |
| 232 | /* Find MSI-X table region */ |
| 233 | offset = 0; |
| 234 | bar_idx = 0; |
| 235 | if (pci_msix_table_bar(dev, &offset, &bar_idx)) { |
| 236 | printk(BIOS_ERR, "ERROR: %s: Failed to find MSI-X entry\n", |
| 237 | dev_path(dev)); |
| 238 | return -1; |
| 239 | } |
| 240 | bar = get_bar_val(dev, bar_idx); |
| 241 | if (!bar) { |
| 242 | printk(BIOS_ERR, "ERROR: %s: Failed to find MSI-X bar\n", |
| 243 | dev_path(dev)); |
| 244 | return -1; |
| 245 | } |
| 246 | msixtable = (struct msix_entry *)((void *)bar + offset); |
| 247 | |
| 248 | /* |
| 249 | * Some devices require MSI-X to be enabled before we can touch the |
| 250 | * MSI-X registers. We need to mask all the vectors to prevent |
| 251 | * interrupts coming in before they're fully set up. |
| 252 | */ |
| 253 | control |= PCI_MSIX_FLAGS_MASKALL | PCI_MSIX_FLAGS_ENABLE; |
| 254 | pci_write_config16(dev, pos + PCI_MSIX_FLAGS, control); |
| 255 | |
| 256 | for (i = 0; i < nvec; i++) { |
| 257 | write64(&msixtable[i].addr, entries[i].addr); |
| 258 | write32(&msixtable[i].data, entries[i].data); |
| 259 | write32(&msixtable[i].vec_control, entries[i].vec_control); |
| 260 | } |
| 261 | |
| 262 | control &= ~PCI_MSIX_FLAGS_MASKALL; |
| 263 | pci_write_config16(dev, pos + PCI_MSIX_FLAGS, control); |
| 264 | |
| 265 | return 0; |
| 266 | } |
| 267 | |
| 268 | static void ecam0_init(struct device *dev) |
| 269 | { |
| 270 | struct soc_cavium_common_pci_config *config; |
| 271 | struct device *child, *child_last; |
| 272 | size_t i; |
| 273 | u32 reg32; |
| 274 | |
| 275 | printk(BIOS_INFO, "ECAM0: init\n"); |
| 276 | const struct device *bridge = dev_find_slot(0, PCI_DEVFN(1, 0)); |
| 277 | if (!bridge) { |
| 278 | printk(BIOS_INFO, "ECAM0: ERROR: PCI 00:01.0 not found.\n"); |
| 279 | return; |
| 280 | } |
| 281 | /** |
| 282 | * Search for missing devices on BUS 1. |
| 283 | * Only required for ARI capability programming. |
| 284 | */ |
| 285 | ecam0_fix_missing_devices(bridge->link_list); |
| 286 | |
| 287 | /* Program secure ARI capability on bus 1 */ |
| 288 | child_last = NULL; |
| 289 | for (i = 0; i <= PCI_DEVFN(0x1f, 7); i++) { |
| 290 | child = dev_find_slot(bridge->link_list->secondary, i); |
| 291 | if (!child || !child->enabled) |
| 292 | continue; |
| 293 | |
| 294 | if (child_last) { |
| 295 | /* Program ARI capability of the previous device */ |
| 296 | reg32 = pci_read_config32(child_last, |
| 297 | CAVM_PCCPF_XXX_VSEC_SCTL); |
| 298 | reg32 &= ~(0xffU << 24); |
| 299 | reg32 |= child->path.pci.devfn << 24; |
| 300 | pci_write_config32(child_last, CAVM_PCCPF_XXX_VSEC_SCTL, |
| 301 | reg32); |
| 302 | } |
| 303 | child_last = child; |
| 304 | } |
| 305 | |
| 306 | /* Program insecure ARI capability on bus 1 */ |
| 307 | child_last = NULL; |
| 308 | for (i = 0; i <= PCI_DEVFN(0x1f, 7); i++) { |
| 309 | child = dev_find_slot(bridge->link_list->secondary, i); |
| 310 | if (!child) |
| 311 | continue; |
| 312 | config = child->chip_info; |
| 313 | if (!child->enabled || (config && config->secure)) |
| 314 | continue; |
| 315 | |
| 316 | if (child_last) { |
| 317 | /* Program ARI capability of the previous device */ |
| 318 | reg32 = pci_read_config32(child_last, |
| 319 | CAVM_PCCPF_XXX_VSEC_CTL); |
| 320 | reg32 &= ~(0xffU << 24); |
| 321 | reg32 |= child->path.pci.devfn << 24; |
| 322 | pci_write_config32(child_last, CAVM_PCCPF_XXX_VSEC_CTL, |
| 323 | reg32); |
| 324 | } |
| 325 | child_last = child; |
| 326 | } |
| 327 | |
| 328 | /* Enable / disable devices on bus 0 */ |
| 329 | for (i = 0; i <= 0x1f; i++) { |
| 330 | child = dev_find_slot(0, PCI_DEVFN(i, 0)); |
| 331 | config = child ? child->chip_info : NULL; |
| 332 | if (child && child->enabled && config && !config->secure) |
| 333 | enable_device(i); |
| 334 | else |
| 335 | disable_device(i); |
| 336 | } |
| 337 | |
| 338 | /* Enable / disable devices and functions on bus 1 */ |
| 339 | for (i = 0; i <= PCI_DEVFN(0x1f, 7); i++) { |
| 340 | child = dev_find_slot(bridge->link_list->secondary, i); |
| 341 | config = child ? child->chip_info : NULL; |
| 342 | if (child && child->enabled && |
| 343 | ((config && !config->secure) || !config)) |
| 344 | enable_func(i); |
| 345 | else |
| 346 | disable_func(i); |
| 347 | } |
| 348 | |
| 349 | /* Apply IRQ on PCI devices */ |
| 350 | /* UUA */ |
| 351 | for (i = 0; i < 4; i++) { |
| 352 | child = dev_find_slot(bridge->link_list->secondary, |
| 353 | PCI_DEVFN(8, i)); |
| 354 | if (!child) |
| 355 | continue; |
| 356 | |
| 357 | struct msix_entry entry[2] = { |
| 358 | {.addr = CAVM_GICD_SETSPI_NSR, .data = 37 + i}, |
| 359 | {.addr = CAVM_GICD_CLRSPI_NSR, .data = 37 + i}, |
| 360 | }; |
| 361 | |
| 362 | ecam0_pci_enable_msix(child, entry, 2); |
| 363 | } |
| 364 | |
| 365 | printk(BIOS_INFO, "ECAM0: done\n"); |
| 366 | } |
| 367 | |
| 368 | struct device_operations pci_domain_ops_ecam0 = { |
| 369 | .set_resources = NULL, |
| 370 | .enable_resources = NULL, |
| 371 | .read_resources = ecam0_read_resources, |
| 372 | .init = ecam0_init, |
| 373 | .scan_bus = pci_domain_scan_bus, |
| 374 | }; |