Skip to content
This repository
Fetching contributors…

Cannot retrieve contributors at this time

file 498 lines (425 sloc) 12.515 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498
/*
* PCI handling of I2O controller
*
* Copyright (C) 1999-2002 Red Hat Software
*
* Written by Alan Cox, Building Number Three Ltd
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* A lot of the I2O message side code from this is taken from the Red
* Creek RCPCI45 adapter driver by Red Creek Communications
*
* Fixes/additions:
* Philipp Rumpf
* Juha Sievänen <Juha.Sievanen@cs.Helsinki.FI>
* Auvo Häkkinen <Auvo.Hakkinen@cs.Helsinki.FI>
* Deepak Saxena <deepak@plexity.net>
* Boji T Kannanthanam <boji.t.kannanthanam@intel.com>
* Alan Cox <alan@lxorguk.ukuu.org.uk>:
* Ported to Linux 2.5.
* Markus Lidel <Markus.Lidel@shadowconnect.com>:
* Minor fixes for 2.6.
* Markus Lidel <Markus.Lidel@shadowconnect.com>:
* Support for sysfs included.
*/

#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/i2o.h>
#include <linux/module.h>
#include "core.h"

#define OSM_DESCRIPTION "I2O-subsystem"

/* PCI device id table for all I2O controllers */
static struct pci_device_id __devinitdata i2o_pci_ids[] = {
{PCI_DEVICE_CLASS(PCI_CLASS_INTELLIGENT_I2O << 8, 0xffff00)},
{PCI_DEVICE(PCI_VENDOR_ID_DPT, 0xa511)},
{.vendor = PCI_VENDOR_ID_INTEL,.device = 0x1962,
.subvendor = PCI_VENDOR_ID_PROMISE,.subdevice = PCI_ANY_ID},
{0}
};

/**
* i2o_pci_free - Frees the DMA memory for the I2O controller
* @c: I2O controller to free
*
* Remove all allocated DMA memory and unmap memory IO regions. If MTRR
* is enabled, also remove it again.
*/
static void i2o_pci_free(struct i2o_controller *c)
{
struct device *dev;

dev = &c->pdev->dev;

i2o_dma_free(dev, &c->out_queue);
i2o_dma_free(dev, &c->status_block);
kfree(c->lct);
i2o_dma_free(dev, &c->dlct);
i2o_dma_free(dev, &c->hrt);
i2o_dma_free(dev, &c->status);

if (c->raptor && c->in_queue.virt)
iounmap(c->in_queue.virt);

if (c->base.virt)
iounmap(c->base.virt);

pci_release_regions(c->pdev);
}

/**
* i2o_pci_alloc - Allocate DMA memory, map IO memory for I2O controller
* @c: I2O controller
*
* Allocate DMA memory for a PCI (or in theory AGP) I2O controller. All
* IO mappings are also done here. If MTRR is enabled, also do add memory
* regions here.
*
* Returns 0 on success or negative error code on failure.
*/
static int __devinit i2o_pci_alloc(struct i2o_controller *c)
{
struct pci_dev *pdev = c->pdev;
struct device *dev = &pdev->dev;
int i;

if (pci_request_regions(pdev, OSM_DESCRIPTION)) {
printk(KERN_ERR "%s: device already claimed\n", c->name);
return -ENODEV;
}

for (i = 0; i < 6; i++) {
/* Skip I/O spaces */
if (!(pci_resource_flags(pdev, i) & IORESOURCE_IO)) {
if (!c->base.phys) {
c->base.phys = pci_resource_start(pdev, i);
c->base.len = pci_resource_len(pdev, i);

/*
* If we know what card it is, set the size
* correctly. Code is taken from dpt_i2o.c
*/
if (pdev->device == 0xa501) {
if (pdev->subsystem_device >= 0xc032 &&
pdev->subsystem_device <= 0xc03b) {
if (c->base.len > 0x400000)
c->base.len = 0x400000;
} else {
if (c->base.len > 0x100000)
c->base.len = 0x100000;
}
}
if (!c->raptor)
break;
} else {
c->in_queue.phys = pci_resource_start(pdev, i);
c->in_queue.len = pci_resource_len(pdev, i);
break;
}
}
}

if (i == 6) {
printk(KERN_ERR "%s: I2O controller has no memory regions"
" defined.\n", c->name);
i2o_pci_free(c);
return -EINVAL;
}

/* Map the I2O controller */
if (c->raptor) {
printk(KERN_INFO "%s: PCI I2O controller\n", c->name);
printk(KERN_INFO " BAR0 at 0x%08lX size=%ld\n",
(unsigned long)c->base.phys, (unsigned long)c->base.len);
printk(KERN_INFO " BAR1 at 0x%08lX size=%ld\n",
(unsigned long)c->in_queue.phys,
(unsigned long)c->in_queue.len);
} else
printk(KERN_INFO "%s: PCI I2O controller at %08lX size=%ld\n",
c->name, (unsigned long)c->base.phys,
(unsigned long)c->base.len);

c->base.virt = ioremap_nocache(c->base.phys, c->base.len);
if (!c->base.virt) {
printk(KERN_ERR "%s: Unable to map controller.\n", c->name);
i2o_pci_free(c);
return -ENOMEM;
}

if (c->raptor) {
c->in_queue.virt =
ioremap_nocache(c->in_queue.phys, c->in_queue.len);
if (!c->in_queue.virt) {
printk(KERN_ERR "%s: Unable to map controller.\n",
c->name);
i2o_pci_free(c);
return -ENOMEM;
}
} else
c->in_queue = c->base;

c->irq_status = c->base.virt + I2O_IRQ_STATUS;
c->irq_mask = c->base.virt + I2O_IRQ_MASK;
c->in_port = c->base.virt + I2O_IN_PORT;
c->out_port = c->base.virt + I2O_OUT_PORT;

/* Motorola/Freescale chip does not follow spec */
if (pdev->vendor == PCI_VENDOR_ID_MOTOROLA && pdev->device == 0x18c0) {
/* Check if CPU is enabled */
if (be32_to_cpu(readl(c->base.virt + 0x10000)) & 0x10000000) {
printk(KERN_INFO "%s: MPC82XX needs CPU running to "
"service I2O.\n", c->name);
i2o_pci_free(c);
return -ENODEV;
} else {
c->irq_status += I2O_MOTOROLA_PORT_OFFSET;
c->irq_mask += I2O_MOTOROLA_PORT_OFFSET;
c->in_port += I2O_MOTOROLA_PORT_OFFSET;
c->out_port += I2O_MOTOROLA_PORT_OFFSET;
printk(KERN_INFO "%s: MPC82XX workarounds activated.\n",
c->name);
}
}

if (i2o_dma_alloc(dev, &c->status, 8)) {
i2o_pci_free(c);
return -ENOMEM;
}

if (i2o_dma_alloc(dev, &c->hrt, sizeof(i2o_hrt))) {
i2o_pci_free(c);
return -ENOMEM;
}

if (i2o_dma_alloc(dev, &c->dlct, 8192)) {
i2o_pci_free(c);
return -ENOMEM;
}

if (i2o_dma_alloc(dev, &c->status_block, sizeof(i2o_status_block))) {
i2o_pci_free(c);
return -ENOMEM;
}

if (i2o_dma_alloc(dev, &c->out_queue,
I2O_MAX_OUTBOUND_MSG_FRAMES * I2O_OUTBOUND_MSG_FRAME_SIZE *
sizeof(u32))) {
i2o_pci_free(c);
return -ENOMEM;
}

pci_set_drvdata(pdev, c);

return 0;
}

/**
* i2o_pci_interrupt - Interrupt handler for I2O controller
* @irq: interrupt line
* @dev_id: pointer to the I2O controller
*
* Handle an interrupt from a PCI based I2O controller. This turns out
* to be rather simple. We keep the controller pointer in the cookie.
*/
static irqreturn_t i2o_pci_interrupt(int irq, void *dev_id)
{
struct i2o_controller *c = dev_id;
u32 m;
irqreturn_t rc = IRQ_NONE;

while (readl(c->irq_status) & I2O_IRQ_OUTBOUND_POST) {
m = readl(c->out_port);
if (m == I2O_QUEUE_EMPTY) {
/*
* Old 960 steppings had a bug in the I2O unit that
* caused the queue to appear empty when it wasn't.
*/
m = readl(c->out_port);
if (unlikely(m == I2O_QUEUE_EMPTY))
break;
}

/* dispatch it */
if (i2o_driver_dispatch(c, m))
/* flush it if result != 0 */
i2o_flush_reply(c, m);

rc = IRQ_HANDLED;
}

return rc;
}

/**
* i2o_pci_irq_enable - Allocate interrupt for I2O controller
* @c: i2o_controller that the request is for
*
* Allocate an interrupt for the I2O controller, and activate interrupts
* on the I2O controller.
*
* Returns 0 on success or negative error code on failure.
*/
static int i2o_pci_irq_enable(struct i2o_controller *c)
{
struct pci_dev *pdev = c->pdev;
int rc;

writel(0xffffffff, c->irq_mask);

if (pdev->irq) {
rc = request_irq(pdev->irq, i2o_pci_interrupt, IRQF_SHARED,
c->name, c);
if (rc < 0) {
printk(KERN_ERR "%s: unable to allocate interrupt %d."
"\n", c->name, pdev->irq);
return rc;
}
}

writel(0x00000000, c->irq_mask);

printk(KERN_INFO "%s: Installed at IRQ %d\n", c->name, pdev->irq);

return 0;
}

/**
* i2o_pci_irq_disable - Free interrupt for I2O controller
* @c: I2O controller
*
* Disable interrupts in I2O controller and then free interrupt.
*/
static void i2o_pci_irq_disable(struct i2o_controller *c)
{
writel(0xffffffff, c->irq_mask);

if (c->pdev->irq > 0)
free_irq(c->pdev->irq, c);
}

/**
* i2o_pci_probe - Probe the PCI device for an I2O controller
* @pdev: PCI device to test
* @id: id which matched with the PCI device id table
*
* Probe the PCI device for any device which is a memory of the
* Intelligent, I2O class or an Adaptec Zero Channel Controller. We
* attempt to set up each such device and register it with the core.
*
* Returns 0 on success or negative error code on failure.
*/
static int __devinit i2o_pci_probe(struct pci_dev *pdev,
const struct pci_device_id *id)
{
struct i2o_controller *c;
int rc;
struct pci_dev *i960 = NULL;

printk(KERN_INFO "i2o: Checking for PCI I2O controllers...\n");

if ((pdev->class & 0xff) > 1) {
printk(KERN_WARNING "i2o: %s does not support I2O 1.5 "
"(skipping).\n", pci_name(pdev));
return -ENODEV;
}

if ((rc = pci_enable_device(pdev))) {
printk(KERN_WARNING "i2o: couldn't enable device %s\n",
pci_name(pdev));
return rc;
}

if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32))) {
printk(KERN_WARNING "i2o: no suitable DMA found for %s\n",
pci_name(pdev));
rc = -ENODEV;
goto disable;
}

pci_set_master(pdev);

c = i2o_iop_alloc();
if (IS_ERR(c)) {
printk(KERN_ERR "i2o: couldn't allocate memory for %s\n",
pci_name(pdev));
rc = PTR_ERR(c);
goto disable;
} else
printk(KERN_INFO "%s: controller found (%s)\n", c->name,
pci_name(pdev));

c->pdev = pdev;
c->device.parent = &pdev->dev;

/* Cards that fall apart if you hit them with large I/O loads... */
if (pdev->vendor == PCI_VENDOR_ID_NCR && pdev->device == 0x0630) {
c->short_req = 1;
printk(KERN_INFO "%s: Symbios FC920 workarounds activated.\n",
c->name);
}

if (pdev->subsystem_vendor == PCI_VENDOR_ID_PROMISE) {
/*
* Expose the ship behind i960 for initialization, or it will
* failed
*/
i960 = pci_get_slot(c->pdev->bus,
PCI_DEVFN(PCI_SLOT(c->pdev->devfn), 0));

if (i960) {
pci_write_config_word(i960, 0x42, 0);
pci_dev_put(i960);
}

c->promise = 1;
c->limit_sectors = 1;
}

if (pdev->subsystem_vendor == PCI_VENDOR_ID_DPT)
c->adaptec = 1;

/* Cards that go bananas if you quiesce them before you reset them. */
if (pdev->vendor == PCI_VENDOR_ID_DPT) {
c->no_quiesce = 1;
if (pdev->device == 0xa511)
c->raptor = 1;

if (pdev->subsystem_device == 0xc05a) {
c->limit_sectors = 1;
printk(KERN_INFO
"%s: limit sectors per request to %d\n", c->name,
I2O_MAX_SECTORS_LIMITED);
}
#ifdef CONFIG_I2O_EXT_ADAPTEC_DMA64
if (sizeof(dma_addr_t) > 4) {
if (pci_set_dma_mask(pdev, DMA_BIT_MASK(64)))
printk(KERN_INFO "%s: 64-bit DMA unavailable\n",
c->name);
else {
c->pae_support = 1;
printk(KERN_INFO "%s: using 64-bit DMA\n",
c->name);
}
}
#endif
}

if ((rc = i2o_pci_alloc(c))) {
printk(KERN_ERR "%s: DMA / IO allocation for I2O controller "
"failed\n", c->name);
goto free_controller;
}

if (i2o_pci_irq_enable(c)) {
printk(KERN_ERR "%s: unable to enable interrupts for I2O "
"controller\n", c->name);
goto free_pci;
}

if ((rc = i2o_iop_add(c)))
goto uninstall;

if (i960)
pci_write_config_word(i960, 0x42, 0x03ff);

return 0;

      uninstall:
i2o_pci_irq_disable(c);

      free_pci:
i2o_pci_free(c);

      free_controller:
i2o_iop_free(c);

      disable:
pci_disable_device(pdev);

return rc;
}

/**
* i2o_pci_remove - Removes a I2O controller from the system
* @pdev: I2O controller which should be removed
*
* Reset the I2O controller, disable interrupts and remove all allocated
* resources.
*/
static void __devexit i2o_pci_remove(struct pci_dev *pdev)
{
struct i2o_controller *c;
c = pci_get_drvdata(pdev);

i2o_iop_remove(c);
i2o_pci_irq_disable(c);
i2o_pci_free(c);

pci_disable_device(pdev);

printk(KERN_INFO "%s: Controller removed.\n", c->name);

put_device(&c->device);
};

/* PCI driver for I2O controller */
static struct pci_driver i2o_pci_driver = {
.name = "PCI_I2O",
.id_table = i2o_pci_ids,
.probe = i2o_pci_probe,
.remove = __devexit_p(i2o_pci_remove),
};

/**
* i2o_pci_init - registers I2O PCI driver in PCI subsystem
*
* Returns > 0 on success or negative error code on failure.
*/
int __init i2o_pci_init(void)
{
return pci_register_driver(&i2o_pci_driver);
};

/**
* i2o_pci_exit - unregisters I2O PCI driver from PCI subsystem
*/
void __exit i2o_pci_exit(void)
{
pci_unregister_driver(&i2o_pci_driver);
};

MODULE_DEVICE_TABLE(pci, i2o_pci_ids);
Something went wrong with that request. Please try again.