1 /** 2 * tpci200.c 3 * 4 * driver for the TEWS TPCI-200 device 5 * 6 * Copyright (C) 2009-2012 CERN (www.cern.ch) 7 * Author: Nicolas Serafini, EIC2 SA 8 * Author: Samuel Iglesias Gonsalvez <siglesias@igalia.com> 9 * 10 * This program is free software; you can redistribute it and/or modify it 11 * under the terms of the GNU General Public License as published by the Free 12 * Software Foundation; version 2 of the License. 13 */ 14 15 #include <linux/module.h> 16 #include <linux/slab.h> 17 #include "tpci200.h" 18 19 static const u16 tpci200_status_timeout[] = { 20 TPCI200_A_TIMEOUT, 21 TPCI200_B_TIMEOUT, 22 TPCI200_C_TIMEOUT, 23 TPCI200_D_TIMEOUT, 24 }; 25 26 static const u16 tpci200_status_error[] = { 27 TPCI200_A_ERROR, 28 TPCI200_B_ERROR, 29 TPCI200_C_ERROR, 30 TPCI200_D_ERROR, 31 }; 32 33 static const size_t tpci200_space_size[IPACK_SPACE_COUNT] = { 34 [IPACK_IO_SPACE] = TPCI200_IO_SPACE_SIZE, 35 [IPACK_ID_SPACE] = TPCI200_ID_SPACE_SIZE, 36 [IPACK_INT_SPACE] = TPCI200_INT_SPACE_SIZE, 37 [IPACK_MEM8_SPACE] = TPCI200_MEM8_SPACE_SIZE, 38 [IPACK_MEM16_SPACE] = TPCI200_MEM16_SPACE_SIZE, 39 }; 40 41 static const size_t tpci200_space_interval[IPACK_SPACE_COUNT] = { 42 [IPACK_IO_SPACE] = TPCI200_IO_SPACE_INTERVAL, 43 [IPACK_ID_SPACE] = TPCI200_ID_SPACE_INTERVAL, 44 [IPACK_INT_SPACE] = TPCI200_INT_SPACE_INTERVAL, 45 [IPACK_MEM8_SPACE] = TPCI200_MEM8_SPACE_INTERVAL, 46 [IPACK_MEM16_SPACE] = TPCI200_MEM16_SPACE_INTERVAL, 47 }; 48 49 static struct tpci200_board *check_slot(struct ipack_device *dev) 50 { 51 struct tpci200_board *tpci200; 52 53 if (dev == NULL) 54 return NULL; 55 56 57 tpci200 = dev_get_drvdata(dev->bus->parent); 58 59 if (tpci200 == NULL) { 60 dev_info(&dev->dev, "carrier board not found\n"); 61 return NULL; 62 } 63 64 if (dev->slot >= TPCI200_NB_SLOT) { 65 dev_info(&dev->dev, 66 "Slot [%d:%d] doesn't exist! Last tpci200 slot is %d.\n", 67 dev->bus->bus_nr, dev->slot, TPCI200_NB_SLOT-1); 68 return NULL; 69 } 70 71 return tpci200; 72 } 73 74 static void tpci200_clear_mask(struct tpci200_board *tpci200, 75 __le16 __iomem *addr, u16 mask) 76 { 77 unsigned long flags; 78 spin_lock_irqsave(&tpci200->regs_lock, flags); 79 iowrite16(ioread16(addr) & (~mask), addr); 80 spin_unlock_irqrestore(&tpci200->regs_lock, flags); 81 } 82 83 static void tpci200_set_mask(struct tpci200_board *tpci200, 84 __le16 __iomem *addr, u16 mask) 85 { 86 unsigned long flags; 87 spin_lock_irqsave(&tpci200->regs_lock, flags); 88 iowrite16(ioread16(addr) | mask, addr); 89 spin_unlock_irqrestore(&tpci200->regs_lock, flags); 90 } 91 92 static void tpci200_unregister(struct tpci200_board *tpci200) 93 { 94 free_irq(tpci200->info->pdev->irq, (void *) tpci200); 95 96 pci_iounmap(tpci200->info->pdev, tpci200->info->interface_regs); 97 pci_iounmap(tpci200->info->pdev, tpci200->info->cfg_regs); 98 99 pci_release_region(tpci200->info->pdev, TPCI200_IP_INTERFACE_BAR); 100 pci_release_region(tpci200->info->pdev, TPCI200_IO_ID_INT_SPACES_BAR); 101 pci_release_region(tpci200->info->pdev, TPCI200_MEM16_SPACE_BAR); 102 pci_release_region(tpci200->info->pdev, TPCI200_MEM8_SPACE_BAR); 103 pci_release_region(tpci200->info->pdev, TPCI200_CFG_MEM_BAR); 104 105 pci_disable_device(tpci200->info->pdev); 106 pci_dev_put(tpci200->info->pdev); 107 } 108 109 static void tpci200_enable_irq(struct tpci200_board *tpci200, 110 int islot) 111 { 112 tpci200_set_mask(tpci200, 113 &tpci200->info->interface_regs->control[islot], 114 TPCI200_INT0_EN | TPCI200_INT1_EN); 115 } 116 117 static void tpci200_disable_irq(struct tpci200_board *tpci200, 118 int islot) 119 { 120 tpci200_clear_mask(tpci200, 121 &tpci200->info->interface_regs->control[islot], 122 TPCI200_INT0_EN | TPCI200_INT1_EN); 123 } 124 125 static irqreturn_t tpci200_slot_irq(struct slot_irq *slot_irq) 126 { 127 irqreturn_t ret; 128 129 if (!slot_irq) 130 return -ENODEV; 131 ret = slot_irq->handler(slot_irq->arg); 132 133 return ret; 134 } 135 136 static irqreturn_t tpci200_interrupt(int irq, void *dev_id) 137 { 138 struct tpci200_board *tpci200 = (struct tpci200_board *) dev_id; 139 struct slot_irq *slot_irq; 140 irqreturn_t ret; 141 u16 status_reg; 142 int i; 143 144 /* Read status register */ 145 status_reg = ioread16(&tpci200->info->interface_regs->status); 146 147 /* Did we cause the interrupt? */ 148 if (!(status_reg & TPCI200_SLOT_INT_MASK)) 149 return IRQ_NONE; 150 151 /* callback to the IRQ handler for the corresponding slot */ 152 rcu_read_lock(); 153 for (i = 0; i < TPCI200_NB_SLOT; i++) { 154 if (!(status_reg & ((TPCI200_A_INT0 | TPCI200_A_INT1) << (2 * i)))) 155 continue; 156 slot_irq = rcu_dereference(tpci200->slots[i].irq); 157 ret = tpci200_slot_irq(slot_irq); 158 if (ret == -ENODEV) { 159 dev_info(&tpci200->info->pdev->dev, 160 "No registered ISR for slot [%d:%d]!. IRQ will be disabled.\n", 161 tpci200->number, i); 162 tpci200_disable_irq(tpci200, i); 163 } 164 } 165 rcu_read_unlock(); 166 167 return IRQ_HANDLED; 168 } 169 170 static int tpci200_free_irq(struct ipack_device *dev) 171 { 172 struct slot_irq *slot_irq; 173 struct tpci200_board *tpci200; 174 175 tpci200 = check_slot(dev); 176 if (tpci200 == NULL) 177 return -EINVAL; 178 179 if (mutex_lock_interruptible(&tpci200->mutex)) 180 return -ERESTARTSYS; 181 182 if (tpci200->slots[dev->slot].irq == NULL) { 183 mutex_unlock(&tpci200->mutex); 184 return -EINVAL; 185 } 186 187 tpci200_disable_irq(tpci200, dev->slot); 188 slot_irq = tpci200->slots[dev->slot].irq; 189 /* uninstall handler */ 190 RCU_INIT_POINTER(tpci200->slots[dev->slot].irq, NULL); 191 synchronize_rcu(); 192 kfree(slot_irq); 193 mutex_unlock(&tpci200->mutex); 194 return 0; 195 } 196 197 static int tpci200_request_irq(struct ipack_device *dev, 198 irqreturn_t (*handler)(void *), void *arg) 199 { 200 int res = 0; 201 struct slot_irq *slot_irq; 202 struct tpci200_board *tpci200; 203 204 tpci200 = check_slot(dev); 205 if (tpci200 == NULL) 206 return -EINVAL; 207 208 if (mutex_lock_interruptible(&tpci200->mutex)) 209 return -ERESTARTSYS; 210 211 if (tpci200->slots[dev->slot].irq != NULL) { 212 dev_err(&dev->dev, 213 "Slot [%d:%d] IRQ already registered !\n", 214 dev->bus->bus_nr, 215 dev->slot); 216 res = -EINVAL; 217 goto out_unlock; 218 } 219 220 slot_irq = kzalloc(sizeof(struct slot_irq), GFP_KERNEL); 221 if (slot_irq == NULL) { 222 dev_err(&dev->dev, 223 "Slot [%d:%d] unable to allocate memory for IRQ !\n", 224 dev->bus->bus_nr, dev->slot); 225 res = -ENOMEM; 226 goto out_unlock; 227 } 228 229 /* 230 * WARNING: Setup Interrupt Vector in the IndustryPack device 231 * before an IRQ request. 232 * Read the User Manual of your IndustryPack device to know 233 * where to write the vector in memory. 234 */ 235 slot_irq->handler = handler; 236 slot_irq->arg = arg; 237 slot_irq->holder = dev; 238 239 rcu_assign_pointer(tpci200->slots[dev->slot].irq, slot_irq); 240 tpci200_enable_irq(tpci200, dev->slot); 241 242 out_unlock: 243 mutex_unlock(&tpci200->mutex); 244 return res; 245 } 246 247 static int tpci200_register(struct tpci200_board *tpci200) 248 { 249 int i; 250 int res; 251 phys_addr_t ioidint_base; 252 unsigned short slot_ctrl; 253 254 if (pci_enable_device(tpci200->info->pdev) < 0) 255 return -ENODEV; 256 257 /* Request IP interface register (Bar 2) */ 258 res = pci_request_region(tpci200->info->pdev, TPCI200_IP_INTERFACE_BAR, 259 "Carrier IP interface registers"); 260 if (res) { 261 dev_err(&tpci200->info->pdev->dev, 262 "(bn 0x%X, sn 0x%X) failed to allocate PCI resource for BAR 2 !", 263 tpci200->info->pdev->bus->number, 264 tpci200->info->pdev->devfn); 265 goto out_disable_pci; 266 } 267 268 /* Request IO ID INT space (Bar 3) */ 269 res = pci_request_region(tpci200->info->pdev, 270 TPCI200_IO_ID_INT_SPACES_BAR, 271 "Carrier IO ID INT space"); 272 if (res) { 273 dev_err(&tpci200->info->pdev->dev, 274 "(bn 0x%X, sn 0x%X) failed to allocate PCI resource for BAR 3 !", 275 tpci200->info->pdev->bus->number, 276 tpci200->info->pdev->devfn); 277 goto out_release_ip_space; 278 } 279 280 /* Request MEM8 space (Bar 5) */ 281 res = pci_request_region(tpci200->info->pdev, TPCI200_MEM8_SPACE_BAR, 282 "Carrier MEM8 space"); 283 if (res) { 284 dev_err(&tpci200->info->pdev->dev, 285 "(bn 0x%X, sn 0x%X) failed to allocate PCI resource for BAR 5!", 286 tpci200->info->pdev->bus->number, 287 tpci200->info->pdev->devfn); 288 goto out_release_ioid_int_space; 289 } 290 291 /* Request MEM16 space (Bar 4) */ 292 res = pci_request_region(tpci200->info->pdev, TPCI200_MEM16_SPACE_BAR, 293 "Carrier MEM16 space"); 294 if (res) { 295 dev_err(&tpci200->info->pdev->dev, 296 "(bn 0x%X, sn 0x%X) failed to allocate PCI resource for BAR 4!", 297 tpci200->info->pdev->bus->number, 298 tpci200->info->pdev->devfn); 299 goto out_release_mem8_space; 300 } 301 302 /* Map internal tpci200 driver user space */ 303 tpci200->info->interface_regs = 304 ioremap_nocache(pci_resource_start(tpci200->info->pdev, 305 TPCI200_IP_INTERFACE_BAR), 306 TPCI200_IFACE_SIZE); 307 308 /* Initialize lock that protects interface_regs */ 309 spin_lock_init(&tpci200->regs_lock); 310 311 ioidint_base = pci_resource_start(tpci200->info->pdev, 312 TPCI200_IO_ID_INT_SPACES_BAR); 313 tpci200->mod_mem[IPACK_IO_SPACE] = ioidint_base + TPCI200_IO_SPACE_OFF; 314 tpci200->mod_mem[IPACK_ID_SPACE] = ioidint_base + TPCI200_ID_SPACE_OFF; 315 tpci200->mod_mem[IPACK_INT_SPACE] = 316 ioidint_base + TPCI200_INT_SPACE_OFF; 317 tpci200->mod_mem[IPACK_MEM8_SPACE] = 318 pci_resource_start(tpci200->info->pdev, 319 TPCI200_MEM8_SPACE_BAR); 320 tpci200->mod_mem[IPACK_MEM16_SPACE] = 321 pci_resource_start(tpci200->info->pdev, 322 TPCI200_MEM16_SPACE_BAR); 323 324 /* Set the default parameters of the slot 325 * INT0 disabled, level sensitive 326 * INT1 disabled, level sensitive 327 * error interrupt disabled 328 * timeout interrupt disabled 329 * recover time disabled 330 * clock rate 8 MHz 331 */ 332 slot_ctrl = 0; 333 for (i = 0; i < TPCI200_NB_SLOT; i++) 334 writew(slot_ctrl, &tpci200->info->interface_regs->control[i]); 335 336 res = request_irq(tpci200->info->pdev->irq, 337 tpci200_interrupt, IRQF_SHARED, 338 KBUILD_MODNAME, (void *) tpci200); 339 if (res) { 340 dev_err(&tpci200->info->pdev->dev, 341 "(bn 0x%X, sn 0x%X) unable to register IRQ !", 342 tpci200->info->pdev->bus->number, 343 tpci200->info->pdev->devfn); 344 goto out_release_ioid_int_space; 345 } 346 347 return 0; 348 349 out_release_mem8_space: 350 pci_release_region(tpci200->info->pdev, TPCI200_MEM8_SPACE_BAR); 351 out_release_ioid_int_space: 352 pci_release_region(tpci200->info->pdev, TPCI200_IO_ID_INT_SPACES_BAR); 353 out_release_ip_space: 354 pci_release_region(tpci200->info->pdev, TPCI200_IP_INTERFACE_BAR); 355 out_disable_pci: 356 pci_disable_device(tpci200->info->pdev); 357 return res; 358 } 359 360 static int tpci200_get_clockrate(struct ipack_device *dev) 361 { 362 struct tpci200_board *tpci200 = check_slot(dev); 363 __le16 __iomem *addr; 364 365 if (!tpci200) 366 return -ENODEV; 367 368 addr = &tpci200->info->interface_regs->control[dev->slot]; 369 return (ioread16(addr) & TPCI200_CLK32) ? 32 : 8; 370 } 371 372 static int tpci200_set_clockrate(struct ipack_device *dev, int mherz) 373 { 374 struct tpci200_board *tpci200 = check_slot(dev); 375 __le16 __iomem *addr; 376 377 if (!tpci200) 378 return -ENODEV; 379 380 addr = &tpci200->info->interface_regs->control[dev->slot]; 381 382 switch (mherz) { 383 case 8: 384 tpci200_clear_mask(tpci200, addr, TPCI200_CLK32); 385 break; 386 case 32: 387 tpci200_set_mask(tpci200, addr, TPCI200_CLK32); 388 break; 389 default: 390 return -EINVAL; 391 } 392 return 0; 393 } 394 395 static int tpci200_get_error(struct ipack_device *dev) 396 { 397 struct tpci200_board *tpci200 = check_slot(dev); 398 __le16 __iomem *addr; 399 u16 mask; 400 401 if (!tpci200) 402 return -ENODEV; 403 404 addr = &tpci200->info->interface_regs->status; 405 mask = tpci200_status_error[dev->slot]; 406 return (ioread16(addr) & mask) ? 1 : 0; 407 } 408 409 static int tpci200_get_timeout(struct ipack_device *dev) 410 { 411 struct tpci200_board *tpci200 = check_slot(dev); 412 __le16 __iomem *addr; 413 u16 mask; 414 415 if (!tpci200) 416 return -ENODEV; 417 418 addr = &tpci200->info->interface_regs->status; 419 mask = tpci200_status_timeout[dev->slot]; 420 421 return (ioread16(addr) & mask) ? 1 : 0; 422 } 423 424 static int tpci200_reset_timeout(struct ipack_device *dev) 425 { 426 struct tpci200_board *tpci200 = check_slot(dev); 427 __le16 __iomem *addr; 428 u16 mask; 429 430 if (!tpci200) 431 return -ENODEV; 432 433 addr = &tpci200->info->interface_regs->status; 434 mask = tpci200_status_timeout[dev->slot]; 435 436 iowrite16(mask, addr); 437 return 0; 438 } 439 440 static void tpci200_uninstall(struct tpci200_board *tpci200) 441 { 442 tpci200_unregister(tpci200); 443 kfree(tpci200->slots); 444 } 445 446 static const struct ipack_bus_ops tpci200_bus_ops = { 447 .request_irq = tpci200_request_irq, 448 .free_irq = tpci200_free_irq, 449 .get_clockrate = tpci200_get_clockrate, 450 .set_clockrate = tpci200_set_clockrate, 451 .get_error = tpci200_get_error, 452 .get_timeout = tpci200_get_timeout, 453 .reset_timeout = tpci200_reset_timeout, 454 }; 455 456 static int tpci200_install(struct tpci200_board *tpci200) 457 { 458 int res; 459 460 tpci200->slots = kzalloc( 461 TPCI200_NB_SLOT * sizeof(struct tpci200_slot), GFP_KERNEL); 462 if (tpci200->slots == NULL) 463 return -ENOMEM; 464 465 res = tpci200_register(tpci200); 466 if (res) { 467 kfree(tpci200->slots); 468 tpci200->slots = NULL; 469 return res; 470 } 471 472 mutex_init(&tpci200->mutex); 473 return 0; 474 } 475 476 static void tpci200_release_device(struct ipack_device *dev) 477 { 478 kfree(dev); 479 } 480 481 static int tpci200_create_device(struct tpci200_board *tpci200, int i) 482 { 483 int ret; 484 enum ipack_space space; 485 struct ipack_device *dev = 486 kzalloc(sizeof(struct ipack_device), GFP_KERNEL); 487 if (!dev) 488 return -ENOMEM; 489 dev->slot = i; 490 dev->bus = tpci200->info->ipack_bus; 491 dev->release = tpci200_release_device; 492 493 for (space = 0; space < IPACK_SPACE_COUNT; space++) { 494 dev->region[space].start = 495 tpci200->mod_mem[space] 496 + tpci200_space_interval[space] * i; 497 dev->region[space].size = tpci200_space_size[space]; 498 } 499 500 ret = ipack_device_init(dev); 501 if (ret < 0) { 502 ipack_put_device(dev); 503 return ret; 504 } 505 506 ret = ipack_device_add(dev); 507 if (ret < 0) 508 ipack_put_device(dev); 509 510 return ret; 511 } 512 513 static int tpci200_pci_probe(struct pci_dev *pdev, 514 const struct pci_device_id *id) 515 { 516 int ret, i; 517 struct tpci200_board *tpci200; 518 u32 reg32; 519 520 tpci200 = kzalloc(sizeof(struct tpci200_board), GFP_KERNEL); 521 if (!tpci200) 522 return -ENOMEM; 523 524 tpci200->info = kzalloc(sizeof(struct tpci200_infos), GFP_KERNEL); 525 if (!tpci200->info) { 526 ret = -ENOMEM; 527 goto out_err_info; 528 } 529 530 pci_dev_get(pdev); 531 532 /* Obtain a mapping of the carrier's PCI configuration registers */ 533 ret = pci_request_region(pdev, TPCI200_CFG_MEM_BAR, 534 KBUILD_MODNAME " Configuration Memory"); 535 if (ret) { 536 dev_err(&pdev->dev, "Failed to allocate PCI Configuration Memory"); 537 ret = -EBUSY; 538 goto out_err_pci_request; 539 } 540 tpci200->info->cfg_regs = ioremap_nocache( 541 pci_resource_start(pdev, TPCI200_CFG_MEM_BAR), 542 pci_resource_len(pdev, TPCI200_CFG_MEM_BAR)); 543 if (!tpci200->info->cfg_regs) { 544 dev_err(&pdev->dev, "Failed to map PCI Configuration Memory"); 545 ret = -EFAULT; 546 goto out_err_ioremap; 547 } 548 549 /* Disable byte swapping for 16 bit IP module access. This will ensure 550 * that the Industrypack big endian byte order is preserved by the 551 * carrier. */ 552 reg32 = ioread32(tpci200->info->cfg_regs + LAS1_DESC); 553 reg32 |= 1 << LAS_BIT_BIGENDIAN; 554 iowrite32(reg32, tpci200->info->cfg_regs + LAS1_DESC); 555 556 reg32 = ioread32(tpci200->info->cfg_regs + LAS2_DESC); 557 reg32 |= 1 << LAS_BIT_BIGENDIAN; 558 iowrite32(reg32, tpci200->info->cfg_regs + LAS2_DESC); 559 560 /* Save struct pci_dev pointer */ 561 tpci200->info->pdev = pdev; 562 tpci200->info->id_table = (struct pci_device_id *)id; 563 564 /* register the device and initialize it */ 565 ret = tpci200_install(tpci200); 566 if (ret) { 567 dev_err(&pdev->dev, "error during tpci200 install\n"); 568 ret = -ENODEV; 569 goto out_err_install; 570 } 571 572 /* Register the carrier in the industry pack bus driver */ 573 tpci200->info->ipack_bus = ipack_bus_register(&pdev->dev, 574 TPCI200_NB_SLOT, 575 &tpci200_bus_ops); 576 if (!tpci200->info->ipack_bus) { 577 dev_err(&pdev->dev, 578 "error registering the carrier on ipack driver\n"); 579 ret = -EFAULT; 580 goto out_err_bus_register; 581 } 582 583 /* save the bus number given by ipack to logging purpose */ 584 tpci200->number = tpci200->info->ipack_bus->bus_nr; 585 dev_set_drvdata(&pdev->dev, tpci200); 586 587 for (i = 0; i < TPCI200_NB_SLOT; i++) 588 tpci200_create_device(tpci200, i); 589 return 0; 590 591 out_err_bus_register: 592 tpci200_uninstall(tpci200); 593 out_err_install: 594 iounmap(tpci200->info->cfg_regs); 595 out_err_ioremap: 596 pci_release_region(pdev, TPCI200_CFG_MEM_BAR); 597 out_err_pci_request: 598 pci_dev_put(pdev); 599 kfree(tpci200->info); 600 out_err_info: 601 kfree(tpci200); 602 return ret; 603 } 604 605 static void __tpci200_pci_remove(struct tpci200_board *tpci200) 606 { 607 ipack_bus_unregister(tpci200->info->ipack_bus); 608 tpci200_uninstall(tpci200); 609 610 kfree(tpci200->info); 611 kfree(tpci200); 612 } 613 614 static void tpci200_pci_remove(struct pci_dev *dev) 615 { 616 struct tpci200_board *tpci200 = pci_get_drvdata(dev); 617 618 __tpci200_pci_remove(tpci200); 619 } 620 621 static const struct pci_device_id tpci200_idtable[] = { 622 { TPCI200_VENDOR_ID, TPCI200_DEVICE_ID, TPCI200_SUBVENDOR_ID, 623 TPCI200_SUBDEVICE_ID }, 624 { 0, }, 625 }; 626 627 MODULE_DEVICE_TABLE(pci, tpci200_idtable); 628 629 static struct pci_driver tpci200_pci_drv = { 630 .name = "tpci200", 631 .id_table = tpci200_idtable, 632 .probe = tpci200_pci_probe, 633 .remove = tpci200_pci_remove, 634 }; 635 636 module_pci_driver(tpci200_pci_drv); 637 638 MODULE_DESCRIPTION("TEWS TPCI-200 device driver"); 639 MODULE_LICENSE("GPL"); 640