1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * FPGA Manager Driver for Altera Arria/Cyclone/Stratix CvP 4 * 5 * Copyright (C) 2017 DENX Software Engineering 6 * 7 * Anatolij Gustschin <agust@denx.de> 8 * 9 * Manage Altera FPGA firmware using PCIe CvP. 10 * Firmware must be in binary "rbf" format. 11 */ 12 13 #include <linux/delay.h> 14 #include <linux/device.h> 15 #include <linux/fpga/fpga-mgr.h> 16 #include <linux/module.h> 17 #include <linux/pci.h> 18 #include <linux/sizes.h> 19 20 #define CVP_BAR 0 /* BAR used for data transfer in memory mode */ 21 #define CVP_DUMMY_WR 244 /* dummy writes to clear CvP state machine */ 22 #define TIMEOUT_US 2000 /* CVP STATUS timeout for USERMODE polling */ 23 24 /* Vendor Specific Extended Capability Registers */ 25 #define VSE_PCIE_EXT_CAP_ID 0x0 26 #define VSE_PCIE_EXT_CAP_ID_VAL 0x000b /* 16bit */ 27 28 #define VSE_CVP_STATUS 0x1c /* 32bit */ 29 #define VSE_CVP_STATUS_CFG_RDY BIT(18) /* CVP_CONFIG_READY */ 30 #define VSE_CVP_STATUS_CFG_ERR BIT(19) /* CVP_CONFIG_ERROR */ 31 #define VSE_CVP_STATUS_CVP_EN BIT(20) /* ctrl block is enabling CVP */ 32 #define VSE_CVP_STATUS_USERMODE BIT(21) /* USERMODE */ 33 #define VSE_CVP_STATUS_CFG_DONE BIT(23) /* CVP_CONFIG_DONE */ 34 #define VSE_CVP_STATUS_PLD_CLK_IN_USE BIT(24) /* PLD_CLK_IN_USE */ 35 36 #define VSE_CVP_MODE_CTRL 0x20 /* 32bit */ 37 #define VSE_CVP_MODE_CTRL_CVP_MODE BIT(0) /* CVP (1) or normal mode (0) */ 38 #define VSE_CVP_MODE_CTRL_HIP_CLK_SEL BIT(1) /* PMA (1) or fabric clock (0) */ 39 #define VSE_CVP_MODE_CTRL_NUMCLKS_OFF 8 /* NUMCLKS bits offset */ 40 #define VSE_CVP_MODE_CTRL_NUMCLKS_MASK GENMASK(15, 8) 41 42 #define VSE_CVP_DATA 0x28 /* 32bit */ 43 #define VSE_CVP_PROG_CTRL 0x2c /* 32bit */ 44 #define VSE_CVP_PROG_CTRL_CONFIG BIT(0) 45 #define VSE_CVP_PROG_CTRL_START_XFER BIT(1) 46 #define VSE_CVP_PROG_CTRL_MASK GENMASK(1, 0) 47 48 #define VSE_UNCOR_ERR_STATUS 0x34 /* 32bit */ 49 #define VSE_UNCOR_ERR_CVP_CFG_ERR BIT(5) /* CVP_CONFIG_ERROR_LATCHED */ 50 51 #define V1_VSEC_OFFSET 0x200 /* Vendor Specific Offset V1 */ 52 /* V2 Defines */ 53 #define VSE_CVP_TX_CREDITS 0x49 /* 8bit */ 54 55 #define V2_CREDIT_TIMEOUT_US 20000 56 #define V2_CHECK_CREDIT_US 10 57 #define V2_POLL_TIMEOUT_US 1000000 58 #define V2_USER_TIMEOUT_US 500000 59 60 #define V1_POLL_TIMEOUT_US 10 61 62 #define DRV_NAME "altera-cvp" 63 #define ALTERA_CVP_MGR_NAME "Altera CvP FPGA Manager" 64 65 /* Write block sizes */ 66 #define ALTERA_CVP_V1_SIZE 4 67 #define ALTERA_CVP_V2_SIZE 4096 68 69 /* Optional CvP config error status check for debugging */ 70 static bool altera_cvp_chkcfg; 71 72 struct cvp_priv; 73 74 struct altera_cvp_conf { 75 struct fpga_manager *mgr; 76 struct pci_dev *pci_dev; 77 void __iomem *map; 78 void (*write_data)(struct altera_cvp_conf *conf, 79 u32 data); 80 char mgr_name[64]; 81 u8 numclks; 82 u32 sent_packets; 83 u32 vsec_offset; 84 const struct cvp_priv *priv; 85 }; 86 87 struct cvp_priv { 88 void (*switch_clk)(struct altera_cvp_conf *conf); 89 int (*clear_state)(struct altera_cvp_conf *conf); 90 int (*wait_credit)(struct fpga_manager *mgr, u32 blocks); 91 size_t block_size; 92 int poll_time_us; 93 int user_time_us; 94 }; 95 96 static int altera_read_config_byte(struct altera_cvp_conf *conf, 97 int where, u8 *val) 98 { 99 return pci_read_config_byte(conf->pci_dev, conf->vsec_offset + where, 100 val); 101 } 102 103 static int altera_read_config_dword(struct altera_cvp_conf *conf, 104 int where, u32 *val) 105 { 106 return pci_read_config_dword(conf->pci_dev, conf->vsec_offset + where, 107 val); 108 } 109 110 static int altera_write_config_dword(struct altera_cvp_conf *conf, 111 int where, u32 val) 112 { 113 return pci_write_config_dword(conf->pci_dev, conf->vsec_offset + where, 114 val); 115 } 116 117 static enum fpga_mgr_states altera_cvp_state(struct fpga_manager *mgr) 118 { 119 struct altera_cvp_conf *conf = mgr->priv; 120 u32 status; 121 122 altera_read_config_dword(conf, VSE_CVP_STATUS, &status); 123 124 if (status & VSE_CVP_STATUS_CFG_DONE) 125 return FPGA_MGR_STATE_OPERATING; 126 127 if (status & VSE_CVP_STATUS_CVP_EN) 128 return FPGA_MGR_STATE_POWER_UP; 129 130 return FPGA_MGR_STATE_UNKNOWN; 131 } 132 133 static void altera_cvp_write_data_iomem(struct altera_cvp_conf *conf, u32 val) 134 { 135 writel(val, conf->map); 136 } 137 138 static void altera_cvp_write_data_config(struct altera_cvp_conf *conf, u32 val) 139 { 140 pci_write_config_dword(conf->pci_dev, conf->vsec_offset + VSE_CVP_DATA, 141 val); 142 } 143 144 /* switches between CvP clock and internal clock */ 145 static void altera_cvp_dummy_write(struct altera_cvp_conf *conf) 146 { 147 unsigned int i; 148 u32 val; 149 150 /* set 1 CVP clock cycle for every CVP Data Register Write */ 151 altera_read_config_dword(conf, VSE_CVP_MODE_CTRL, &val); 152 val &= ~VSE_CVP_MODE_CTRL_NUMCLKS_MASK; 153 val |= 1 << VSE_CVP_MODE_CTRL_NUMCLKS_OFF; 154 altera_write_config_dword(conf, VSE_CVP_MODE_CTRL, val); 155 156 for (i = 0; i < CVP_DUMMY_WR; i++) 157 conf->write_data(conf, 0); /* dummy data, could be any value */ 158 } 159 160 static int altera_cvp_wait_status(struct altera_cvp_conf *conf, u32 status_mask, 161 u32 status_val, int timeout_us) 162 { 163 unsigned int retries; 164 u32 val; 165 166 retries = timeout_us / 10; 167 if (timeout_us % 10) 168 retries++; 169 170 do { 171 altera_read_config_dword(conf, VSE_CVP_STATUS, &val); 172 if ((val & status_mask) == status_val) 173 return 0; 174 175 /* use small usleep value to re-check and break early */ 176 usleep_range(10, 11); 177 } while (--retries); 178 179 return -ETIMEDOUT; 180 } 181 182 static int altera_cvp_chk_error(struct fpga_manager *mgr, size_t bytes) 183 { 184 struct altera_cvp_conf *conf = mgr->priv; 185 u32 val; 186 int ret; 187 188 /* STEP 10 (optional) - check CVP_CONFIG_ERROR flag */ 189 ret = altera_read_config_dword(conf, VSE_CVP_STATUS, &val); 190 if (ret || (val & VSE_CVP_STATUS_CFG_ERR)) { 191 dev_err(&mgr->dev, "CVP_CONFIG_ERROR after %zu bytes!\n", 192 bytes); 193 return -EPROTO; 194 } 195 return 0; 196 } 197 198 /* 199 * CvP Version2 Functions 200 * Recent Intel FPGAs use a credit mechanism to throttle incoming 201 * bitstreams and a different method of clearing the state. 202 */ 203 204 static int altera_cvp_v2_clear_state(struct altera_cvp_conf *conf) 205 { 206 u32 val; 207 int ret; 208 209 /* Clear the START_XFER and CVP_CONFIG bits */ 210 ret = altera_read_config_dword(conf, VSE_CVP_PROG_CTRL, &val); 211 if (ret) { 212 dev_err(&conf->pci_dev->dev, 213 "Error reading CVP Program Control Register\n"); 214 return ret; 215 } 216 217 val &= ~VSE_CVP_PROG_CTRL_MASK; 218 ret = altera_write_config_dword(conf, VSE_CVP_PROG_CTRL, val); 219 if (ret) { 220 dev_err(&conf->pci_dev->dev, 221 "Error writing CVP Program Control Register\n"); 222 return ret; 223 } 224 225 return altera_cvp_wait_status(conf, VSE_CVP_STATUS_CFG_RDY, 0, 226 conf->priv->poll_time_us); 227 } 228 229 static int altera_cvp_v2_wait_for_credit(struct fpga_manager *mgr, 230 u32 blocks) 231 { 232 u32 timeout = V2_CREDIT_TIMEOUT_US / V2_CHECK_CREDIT_US; 233 struct altera_cvp_conf *conf = mgr->priv; 234 int ret; 235 u8 val; 236 237 do { 238 ret = altera_read_config_byte(conf, VSE_CVP_TX_CREDITS, &val); 239 if (ret) { 240 dev_err(&conf->pci_dev->dev, 241 "Error reading CVP Credit Register\n"); 242 return ret; 243 } 244 245 /* Return if there is space in FIFO */ 246 if (val - (u8)conf->sent_packets) 247 return 0; 248 249 ret = altera_cvp_chk_error(mgr, blocks * ALTERA_CVP_V2_SIZE); 250 if (ret) { 251 dev_err(&conf->pci_dev->dev, 252 "CE Bit error credit reg[0x%x]:sent[0x%x]\n", 253 val, conf->sent_packets); 254 return -EAGAIN; 255 } 256 257 /* Limit the check credit byte traffic */ 258 usleep_range(V2_CHECK_CREDIT_US, V2_CHECK_CREDIT_US + 1); 259 } while (timeout--); 260 261 dev_err(&conf->pci_dev->dev, "Timeout waiting for credit\n"); 262 return -ETIMEDOUT; 263 } 264 265 static int altera_cvp_send_block(struct altera_cvp_conf *conf, 266 const u32 *data, size_t len) 267 { 268 u32 mask, words = len / sizeof(u32); 269 int i, remainder; 270 271 for (i = 0; i < words; i++) 272 conf->write_data(conf, *data++); 273 274 /* write up to 3 trailing bytes, if any */ 275 remainder = len % sizeof(u32); 276 if (remainder) { 277 mask = BIT(remainder * 8) - 1; 278 if (mask) 279 conf->write_data(conf, *data & mask); 280 } 281 282 return 0; 283 } 284 285 static int altera_cvp_teardown(struct fpga_manager *mgr, 286 struct fpga_image_info *info) 287 { 288 struct altera_cvp_conf *conf = mgr->priv; 289 int ret; 290 u32 val; 291 292 /* STEP 12 - reset START_XFER bit */ 293 altera_read_config_dword(conf, VSE_CVP_PROG_CTRL, &val); 294 val &= ~VSE_CVP_PROG_CTRL_START_XFER; 295 altera_write_config_dword(conf, VSE_CVP_PROG_CTRL, val); 296 297 /* STEP 13 - reset CVP_CONFIG bit */ 298 val &= ~VSE_CVP_PROG_CTRL_CONFIG; 299 altera_write_config_dword(conf, VSE_CVP_PROG_CTRL, val); 300 301 /* 302 * STEP 14 303 * - set CVP_NUMCLKS to 1 and then issue CVP_DUMMY_WR dummy 304 * writes to the HIP 305 */ 306 if (conf->priv->switch_clk) 307 conf->priv->switch_clk(conf); 308 309 /* STEP 15 - poll CVP_CONFIG_READY bit for 0 with 10us timeout */ 310 ret = altera_cvp_wait_status(conf, VSE_CVP_STATUS_CFG_RDY, 0, 311 conf->priv->poll_time_us); 312 if (ret) 313 dev_err(&mgr->dev, "CFG_RDY == 0 timeout\n"); 314 315 return ret; 316 } 317 318 static int altera_cvp_write_init(struct fpga_manager *mgr, 319 struct fpga_image_info *info, 320 const char *buf, size_t count) 321 { 322 struct altera_cvp_conf *conf = mgr->priv; 323 u32 iflags, val; 324 int ret; 325 326 iflags = info ? info->flags : 0; 327 328 if (iflags & FPGA_MGR_PARTIAL_RECONFIG) { 329 dev_err(&mgr->dev, "Partial reconfiguration not supported.\n"); 330 return -EINVAL; 331 } 332 333 /* Determine allowed clock to data ratio */ 334 if (iflags & FPGA_MGR_COMPRESSED_BITSTREAM) 335 conf->numclks = 8; /* ratio for all compressed images */ 336 else if (iflags & FPGA_MGR_ENCRYPTED_BITSTREAM) 337 conf->numclks = 4; /* for uncompressed and encrypted images */ 338 else 339 conf->numclks = 1; /* for uncompressed and unencrypted images */ 340 341 /* STEP 1 - read CVP status and check CVP_EN flag */ 342 altera_read_config_dword(conf, VSE_CVP_STATUS, &val); 343 if (!(val & VSE_CVP_STATUS_CVP_EN)) { 344 dev_err(&mgr->dev, "CVP mode off: 0x%04x\n", val); 345 return -ENODEV; 346 } 347 348 if (val & VSE_CVP_STATUS_CFG_RDY) { 349 dev_warn(&mgr->dev, "CvP already started, tear down first\n"); 350 ret = altera_cvp_teardown(mgr, info); 351 if (ret) 352 return ret; 353 } 354 355 /* 356 * STEP 2 357 * - set HIP_CLK_SEL and CVP_MODE (must be set in the order mentioned) 358 */ 359 /* switch from fabric to PMA clock */ 360 altera_read_config_dword(conf, VSE_CVP_MODE_CTRL, &val); 361 val |= VSE_CVP_MODE_CTRL_HIP_CLK_SEL; 362 altera_write_config_dword(conf, VSE_CVP_MODE_CTRL, val); 363 364 /* set CVP mode */ 365 altera_read_config_dword(conf, VSE_CVP_MODE_CTRL, &val); 366 val |= VSE_CVP_MODE_CTRL_CVP_MODE; 367 altera_write_config_dword(conf, VSE_CVP_MODE_CTRL, val); 368 369 /* 370 * STEP 3 371 * - set CVP_NUMCLKS to 1 and issue CVP_DUMMY_WR dummy writes to the HIP 372 */ 373 if (conf->priv->switch_clk) 374 conf->priv->switch_clk(conf); 375 376 if (conf->priv->clear_state) { 377 ret = conf->priv->clear_state(conf); 378 if (ret) { 379 dev_err(&mgr->dev, "Problem clearing out state\n"); 380 return ret; 381 } 382 } 383 384 conf->sent_packets = 0; 385 386 /* STEP 4 - set CVP_CONFIG bit */ 387 altera_read_config_dword(conf, VSE_CVP_PROG_CTRL, &val); 388 /* request control block to begin transfer using CVP */ 389 val |= VSE_CVP_PROG_CTRL_CONFIG; 390 altera_write_config_dword(conf, VSE_CVP_PROG_CTRL, val); 391 392 /* STEP 5 - poll CVP_CONFIG READY for 1 with timeout */ 393 ret = altera_cvp_wait_status(conf, VSE_CVP_STATUS_CFG_RDY, 394 VSE_CVP_STATUS_CFG_RDY, 395 conf->priv->poll_time_us); 396 if (ret) { 397 dev_warn(&mgr->dev, "CFG_RDY == 1 timeout\n"); 398 return ret; 399 } 400 401 /* 402 * STEP 6 403 * - set CVP_NUMCLKS to 1 and issue CVP_DUMMY_WR dummy writes to the HIP 404 */ 405 if (conf->priv->switch_clk) 406 conf->priv->switch_clk(conf); 407 408 if (altera_cvp_chkcfg) { 409 ret = altera_cvp_chk_error(mgr, 0); 410 if (ret) { 411 dev_warn(&mgr->dev, "CFG_RDY == 1 timeout\n"); 412 return ret; 413 } 414 } 415 416 /* STEP 7 - set START_XFER */ 417 altera_read_config_dword(conf, VSE_CVP_PROG_CTRL, &val); 418 val |= VSE_CVP_PROG_CTRL_START_XFER; 419 altera_write_config_dword(conf, VSE_CVP_PROG_CTRL, val); 420 421 /* STEP 8 - start transfer (set CVP_NUMCLKS for bitstream) */ 422 if (conf->priv->switch_clk) { 423 altera_read_config_dword(conf, VSE_CVP_MODE_CTRL, &val); 424 val &= ~VSE_CVP_MODE_CTRL_NUMCLKS_MASK; 425 val |= conf->numclks << VSE_CVP_MODE_CTRL_NUMCLKS_OFF; 426 altera_write_config_dword(conf, VSE_CVP_MODE_CTRL, val); 427 } 428 return 0; 429 } 430 431 static int altera_cvp_write(struct fpga_manager *mgr, const char *buf, 432 size_t count) 433 { 434 struct altera_cvp_conf *conf = mgr->priv; 435 size_t done, remaining, len; 436 const u32 *data; 437 int status = 0; 438 439 /* STEP 9 - write 32-bit data from RBF file to CVP data register */ 440 data = (u32 *)buf; 441 remaining = count; 442 done = 0; 443 444 while (remaining) { 445 /* Use credit throttling if available */ 446 if (conf->priv->wait_credit) { 447 status = conf->priv->wait_credit(mgr, done); 448 if (status) { 449 dev_err(&conf->pci_dev->dev, 450 "Wait Credit ERR: 0x%x\n", status); 451 return status; 452 } 453 } 454 455 len = min(conf->priv->block_size, remaining); 456 altera_cvp_send_block(conf, data, len); 457 data += len / sizeof(u32); 458 done += len; 459 remaining -= len; 460 conf->sent_packets++; 461 462 /* 463 * STEP 10 (optional) and STEP 11 464 * - check error flag 465 * - loop until data transfer completed 466 * Config images can be huge (more than 40 MiB), so 467 * only check after a new 4k data block has been written. 468 * This reduces the number of checks and speeds up the 469 * configuration process. 470 */ 471 if (altera_cvp_chkcfg && !(done % SZ_4K)) { 472 status = altera_cvp_chk_error(mgr, done); 473 if (status < 0) 474 return status; 475 } 476 } 477 478 if (altera_cvp_chkcfg) 479 status = altera_cvp_chk_error(mgr, count); 480 481 return status; 482 } 483 484 static int altera_cvp_write_complete(struct fpga_manager *mgr, 485 struct fpga_image_info *info) 486 { 487 struct altera_cvp_conf *conf = mgr->priv; 488 u32 mask, val; 489 int ret; 490 491 ret = altera_cvp_teardown(mgr, info); 492 if (ret) 493 return ret; 494 495 /* STEP 16 - check CVP_CONFIG_ERROR_LATCHED bit */ 496 altera_read_config_dword(conf, VSE_UNCOR_ERR_STATUS, &val); 497 if (val & VSE_UNCOR_ERR_CVP_CFG_ERR) { 498 dev_err(&mgr->dev, "detected CVP_CONFIG_ERROR_LATCHED!\n"); 499 return -EPROTO; 500 } 501 502 /* STEP 17 - reset CVP_MODE and HIP_CLK_SEL bit */ 503 altera_read_config_dword(conf, VSE_CVP_MODE_CTRL, &val); 504 val &= ~VSE_CVP_MODE_CTRL_HIP_CLK_SEL; 505 val &= ~VSE_CVP_MODE_CTRL_CVP_MODE; 506 altera_write_config_dword(conf, VSE_CVP_MODE_CTRL, val); 507 508 /* STEP 18 - poll PLD_CLK_IN_USE and USER_MODE bits */ 509 mask = VSE_CVP_STATUS_PLD_CLK_IN_USE | VSE_CVP_STATUS_USERMODE; 510 ret = altera_cvp_wait_status(conf, mask, mask, 511 conf->priv->user_time_us); 512 if (ret) 513 dev_err(&mgr->dev, "PLD_CLK_IN_USE|USERMODE timeout\n"); 514 515 return ret; 516 } 517 518 static const struct fpga_manager_ops altera_cvp_ops = { 519 .state = altera_cvp_state, 520 .write_init = altera_cvp_write_init, 521 .write = altera_cvp_write, 522 .write_complete = altera_cvp_write_complete, 523 }; 524 525 static const struct cvp_priv cvp_priv_v1 = { 526 .switch_clk = altera_cvp_dummy_write, 527 .block_size = ALTERA_CVP_V1_SIZE, 528 .poll_time_us = V1_POLL_TIMEOUT_US, 529 .user_time_us = TIMEOUT_US, 530 }; 531 532 static const struct cvp_priv cvp_priv_v2 = { 533 .clear_state = altera_cvp_v2_clear_state, 534 .wait_credit = altera_cvp_v2_wait_for_credit, 535 .block_size = ALTERA_CVP_V2_SIZE, 536 .poll_time_us = V2_POLL_TIMEOUT_US, 537 .user_time_us = V2_USER_TIMEOUT_US, 538 }; 539 540 static ssize_t chkcfg_show(struct device_driver *dev, char *buf) 541 { 542 return snprintf(buf, 3, "%d\n", altera_cvp_chkcfg); 543 } 544 545 static ssize_t chkcfg_store(struct device_driver *drv, const char *buf, 546 size_t count) 547 { 548 int ret; 549 550 ret = kstrtobool(buf, &altera_cvp_chkcfg); 551 if (ret) 552 return ret; 553 554 return count; 555 } 556 557 static DRIVER_ATTR_RW(chkcfg); 558 559 static int altera_cvp_probe(struct pci_dev *pdev, 560 const struct pci_device_id *dev_id); 561 static void altera_cvp_remove(struct pci_dev *pdev); 562 563 static struct pci_device_id altera_cvp_id_tbl[] = { 564 { PCI_VDEVICE(ALTERA, PCI_ANY_ID) }, 565 { } 566 }; 567 MODULE_DEVICE_TABLE(pci, altera_cvp_id_tbl); 568 569 static struct pci_driver altera_cvp_driver = { 570 .name = DRV_NAME, 571 .id_table = altera_cvp_id_tbl, 572 .probe = altera_cvp_probe, 573 .remove = altera_cvp_remove, 574 }; 575 576 static int altera_cvp_probe(struct pci_dev *pdev, 577 const struct pci_device_id *dev_id) 578 { 579 struct altera_cvp_conf *conf; 580 struct fpga_manager *mgr; 581 int ret, offset; 582 u16 cmd, val; 583 u32 regval; 584 585 /* Discover the Vendor Specific Offset for this device */ 586 offset = pci_find_next_ext_capability(pdev, 0, PCI_EXT_CAP_ID_VNDR); 587 if (!offset) { 588 dev_err(&pdev->dev, "No Vendor Specific Offset.\n"); 589 return -ENODEV; 590 } 591 592 /* 593 * First check if this is the expected FPGA device. PCI config 594 * space access works without enabling the PCI device, memory 595 * space access is enabled further down. 596 */ 597 pci_read_config_word(pdev, offset + VSE_PCIE_EXT_CAP_ID, &val); 598 if (val != VSE_PCIE_EXT_CAP_ID_VAL) { 599 dev_err(&pdev->dev, "Wrong EXT_CAP_ID value 0x%x\n", val); 600 return -ENODEV; 601 } 602 603 pci_read_config_dword(pdev, offset + VSE_CVP_STATUS, ®val); 604 if (!(regval & VSE_CVP_STATUS_CVP_EN)) { 605 dev_err(&pdev->dev, 606 "CVP is disabled for this device: CVP_STATUS Reg 0x%x\n", 607 regval); 608 return -ENODEV; 609 } 610 611 conf = devm_kzalloc(&pdev->dev, sizeof(*conf), GFP_KERNEL); 612 if (!conf) 613 return -ENOMEM; 614 615 conf->vsec_offset = offset; 616 617 /* 618 * Enable memory BAR access. We cannot use pci_enable_device() here 619 * because it will make the driver unusable with FPGA devices that 620 * have additional big IOMEM resources (e.g. 4GiB BARs) on 32-bit 621 * platform. Such BARs will not have an assigned address range and 622 * pci_enable_device() will fail, complaining about not claimed BAR, 623 * even if the concerned BAR is not needed for FPGA configuration 624 * at all. Thus, enable the device via PCI config space command. 625 */ 626 pci_read_config_word(pdev, PCI_COMMAND, &cmd); 627 if (!(cmd & PCI_COMMAND_MEMORY)) { 628 cmd |= PCI_COMMAND_MEMORY; 629 pci_write_config_word(pdev, PCI_COMMAND, cmd); 630 } 631 632 ret = pci_request_region(pdev, CVP_BAR, "CVP"); 633 if (ret) { 634 dev_err(&pdev->dev, "Requesting CVP BAR region failed\n"); 635 goto err_disable; 636 } 637 638 conf->pci_dev = pdev; 639 conf->write_data = altera_cvp_write_data_iomem; 640 641 if (conf->vsec_offset == V1_VSEC_OFFSET) 642 conf->priv = &cvp_priv_v1; 643 else 644 conf->priv = &cvp_priv_v2; 645 646 conf->map = pci_iomap(pdev, CVP_BAR, 0); 647 if (!conf->map) { 648 dev_warn(&pdev->dev, "Mapping CVP BAR failed\n"); 649 conf->write_data = altera_cvp_write_data_config; 650 } 651 652 snprintf(conf->mgr_name, sizeof(conf->mgr_name), "%s @%s", 653 ALTERA_CVP_MGR_NAME, pci_name(pdev)); 654 655 mgr = fpga_mgr_register(&pdev->dev, conf->mgr_name, 656 &altera_cvp_ops, conf); 657 if (IS_ERR(mgr)) { 658 ret = PTR_ERR(mgr); 659 goto err_unmap; 660 } 661 662 pci_set_drvdata(pdev, mgr); 663 664 return 0; 665 666 err_unmap: 667 if (conf->map) 668 pci_iounmap(pdev, conf->map); 669 pci_release_region(pdev, CVP_BAR); 670 err_disable: 671 cmd &= ~PCI_COMMAND_MEMORY; 672 pci_write_config_word(pdev, PCI_COMMAND, cmd); 673 return ret; 674 } 675 676 static void altera_cvp_remove(struct pci_dev *pdev) 677 { 678 struct fpga_manager *mgr = pci_get_drvdata(pdev); 679 struct altera_cvp_conf *conf = mgr->priv; 680 u16 cmd; 681 682 fpga_mgr_unregister(mgr); 683 if (conf->map) 684 pci_iounmap(pdev, conf->map); 685 pci_release_region(pdev, CVP_BAR); 686 pci_read_config_word(pdev, PCI_COMMAND, &cmd); 687 cmd &= ~PCI_COMMAND_MEMORY; 688 pci_write_config_word(pdev, PCI_COMMAND, cmd); 689 } 690 691 static int __init altera_cvp_init(void) 692 { 693 int ret; 694 695 ret = pci_register_driver(&altera_cvp_driver); 696 if (ret) 697 return ret; 698 699 ret = driver_create_file(&altera_cvp_driver.driver, 700 &driver_attr_chkcfg); 701 if (ret) 702 pr_warn("Can't create sysfs chkcfg file\n"); 703 704 return 0; 705 } 706 707 static void __exit altera_cvp_exit(void) 708 { 709 driver_remove_file(&altera_cvp_driver.driver, &driver_attr_chkcfg); 710 pci_unregister_driver(&altera_cvp_driver); 711 } 712 713 module_init(altera_cvp_init); 714 module_exit(altera_cvp_exit); 715 716 MODULE_LICENSE("GPL v2"); 717 MODULE_AUTHOR("Anatolij Gustschin <agust@denx.de>"); 718 MODULE_DESCRIPTION("Module to load Altera FPGA over CvP"); 719