Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

Linux/drivers/message/i2o/pci.c

  1 /*
  2  *      PCI handling of I2O controller
  3  *
  4  *      Copyright (C) 1999-2002 Red Hat Software
  5  *
  6  *      Written by Alan Cox, Building Number Three Ltd
  7  *
  8  *      This program is free software; you can redistribute it and/or modify it
  9  *      under the terms of the GNU General Public License as published by the
 10  *      Free Software Foundation; either version 2 of the License, or (at your
 11  *      option) any later version.
 12  *
 13  *      A lot of the I2O message side code from this is taken from the Red
 14  *      Creek RCPCI45 adapter driver by Red Creek Communications
 15  *
 16  *      Fixes/additions:
 17  *              Philipp Rumpf
 18  *              Juha Sievänen <Juha.Sievanen@cs.Helsinki.FI>
 19  *              Auvo Häkkinen <Auvo.Hakkinen@cs.Helsinki.FI>
 20  *              Deepak Saxena <deepak@plexity.net>
 21  *              Boji T Kannanthanam <boji.t.kannanthanam@intel.com>
 22  *              Alan Cox <alan@lxorguk.ukuu.org.uk>:
 23  *                      Ported to Linux 2.5.
 24  *              Markus Lidel <Markus.Lidel@shadowconnect.com>:
 25  *                      Minor fixes for 2.6.
 26  *              Markus Lidel <Markus.Lidel@shadowconnect.com>:
 27  *                      Support for sysfs included.
 28  */
 29 
 30 #include <linux/pci.h>
 31 #include <linux/interrupt.h>
 32 #include <linux/slab.h>
 33 #include <linux/i2o.h>
 34 #include <linux/module.h>
 35 #include "core.h"
 36 
 37 #define OSM_DESCRIPTION "I2O-subsystem"
 38 
 39 /* PCI device id table for all I2O controllers */
 40 static struct pci_device_id i2o_pci_ids[] = {
 41         {PCI_DEVICE_CLASS(PCI_CLASS_INTELLIGENT_I2O << 8, 0xffff00)},
 42         {PCI_DEVICE(PCI_VENDOR_ID_DPT, 0xa511)},
 43         {.vendor = PCI_VENDOR_ID_INTEL,.device = 0x1962,
 44          .subvendor = PCI_VENDOR_ID_PROMISE,.subdevice = PCI_ANY_ID},
 45         {0}
 46 };
 47 
 48 /**
 49  *      i2o_pci_free - Frees the DMA memory for the I2O controller
 50  *      @c: I2O controller to free
 51  *
 52  *      Remove all allocated DMA memory and unmap memory IO regions. If MTRR
 53  *      is enabled, also remove it again.
 54  */
 55 static void i2o_pci_free(struct i2o_controller *c)
 56 {
 57         struct device *dev;
 58 
 59         dev = &c->pdev->dev;
 60 
 61         i2o_dma_free(dev, &c->out_queue);
 62         i2o_dma_free(dev, &c->status_block);
 63         kfree(c->lct);
 64         i2o_dma_free(dev, &c->dlct);
 65         i2o_dma_free(dev, &c->hrt);
 66         i2o_dma_free(dev, &c->status);
 67 
 68         if (c->raptor && c->in_queue.virt)
 69                 iounmap(c->in_queue.virt);
 70 
 71         if (c->base.virt)
 72                 iounmap(c->base.virt);
 73 
 74         pci_release_regions(c->pdev);
 75 }
 76 
 77 /**
 78  *      i2o_pci_alloc - Allocate DMA memory, map IO memory for I2O controller
 79  *      @c: I2O controller
 80  *
 81  *      Allocate DMA memory for a PCI (or in theory AGP) I2O controller. All
 82  *      IO mappings are also done here. If MTRR is enabled, also do add memory
 83  *      regions here.
 84  *
 85  *      Returns 0 on success or negative error code on failure.
 86  */
 87 static int i2o_pci_alloc(struct i2o_controller *c)
 88 {
 89         struct pci_dev *pdev = c->pdev;
 90         struct device *dev = &pdev->dev;
 91         int i;
 92 
 93         if (pci_request_regions(pdev, OSM_DESCRIPTION)) {
 94                 printk(KERN_ERR "%s: device already claimed\n", c->name);
 95                 return -ENODEV;
 96         }
 97 
 98         for (i = 0; i < 6; i++) {
 99                 /* Skip I/O spaces */
100                 if (!(pci_resource_flags(pdev, i) & IORESOURCE_IO)) {
101                         if (!c->base.phys) {
102                                 c->base.phys = pci_resource_start(pdev, i);
103                                 c->base.len = pci_resource_len(pdev, i);
104 
105                                 /*
106                                  * If we know what card it is, set the size
107                                  * correctly. Code is taken from dpt_i2o.c
108                                  */
109                                 if (pdev->device == 0xa501) {
110                                         if (pdev->subsystem_device >= 0xc032 &&
111                                             pdev->subsystem_device <= 0xc03b) {
112                                                 if (c->base.len > 0x400000)
113                                                         c->base.len = 0x400000;
114                                         } else {
115                                                 if (c->base.len > 0x100000)
116                                                         c->base.len = 0x100000;
117                                         }
118                                 }
119                                 if (!c->raptor)
120                                         break;
121                         } else {
122                                 c->in_queue.phys = pci_resource_start(pdev, i);
123                                 c->in_queue.len = pci_resource_len(pdev, i);
124                                 break;
125                         }
126                 }
127         }
128 
129         if (i == 6) {
130                 printk(KERN_ERR "%s: I2O controller has no memory regions"
131                        " defined.\n", c->name);
132                 i2o_pci_free(c);
133                 return -EINVAL;
134         }
135 
136         /* Map the I2O controller */
137         if (c->raptor) {
138                 printk(KERN_INFO "%s: PCI I2O controller\n", c->name);
139                 printk(KERN_INFO "     BAR0 at 0x%08lX size=%ld\n",
140                        (unsigned long)c->base.phys, (unsigned long)c->base.len);
141                 printk(KERN_INFO "     BAR1 at 0x%08lX size=%ld\n",
142                        (unsigned long)c->in_queue.phys,
143                        (unsigned long)c->in_queue.len);
144         } else
145                 printk(KERN_INFO "%s: PCI I2O controller at %08lX size=%ld\n",
146                        c->name, (unsigned long)c->base.phys,
147                        (unsigned long)c->base.len);
148 
149         c->base.virt = ioremap_nocache(c->base.phys, c->base.len);
150         if (!c->base.virt) {
151                 printk(KERN_ERR "%s: Unable to map controller.\n", c->name);
152                 i2o_pci_free(c);
153                 return -ENOMEM;
154         }
155 
156         if (c->raptor) {
157                 c->in_queue.virt =
158                     ioremap_nocache(c->in_queue.phys, c->in_queue.len);
159                 if (!c->in_queue.virt) {
160                         printk(KERN_ERR "%s: Unable to map controller.\n",
161                                c->name);
162                         i2o_pci_free(c);
163                         return -ENOMEM;
164                 }
165         } else
166                 c->in_queue = c->base;
167 
168         c->irq_status = c->base.virt + I2O_IRQ_STATUS;
169         c->irq_mask = c->base.virt + I2O_IRQ_MASK;
170         c->in_port = c->base.virt + I2O_IN_PORT;
171         c->out_port = c->base.virt + I2O_OUT_PORT;
172 
173         /* Motorola/Freescale chip does not follow spec */
174         if (pdev->vendor == PCI_VENDOR_ID_MOTOROLA && pdev->device == 0x18c0) {
175                 /* Check if CPU is enabled */
176                 if (be32_to_cpu(readl(c->base.virt + 0x10000)) & 0x10000000) {
177                         printk(KERN_INFO "%s: MPC82XX needs CPU running to "
178                                "service I2O.\n", c->name);
179                         i2o_pci_free(c);
180                         return -ENODEV;
181                 } else {
182                         c->irq_status += I2O_MOTOROLA_PORT_OFFSET;
183                         c->irq_mask += I2O_MOTOROLA_PORT_OFFSET;
184                         c->in_port += I2O_MOTOROLA_PORT_OFFSET;
185                         c->out_port += I2O_MOTOROLA_PORT_OFFSET;
186                         printk(KERN_INFO "%s: MPC82XX workarounds activated.\n",
187                                c->name);
188                 }
189         }
190 
191         if (i2o_dma_alloc(dev, &c->status, 8)) {
192                 i2o_pci_free(c);
193                 return -ENOMEM;
194         }
195 
196         if (i2o_dma_alloc(dev, &c->hrt, sizeof(i2o_hrt))) {
197                 i2o_pci_free(c);
198                 return -ENOMEM;
199         }
200 
201         if (i2o_dma_alloc(dev, &c->dlct, 8192)) {
202                 i2o_pci_free(c);
203                 return -ENOMEM;
204         }
205 
206         if (i2o_dma_alloc(dev, &c->status_block, sizeof(i2o_status_block))) {
207                 i2o_pci_free(c);
208                 return -ENOMEM;
209         }
210 
211         if (i2o_dma_alloc(dev, &c->out_queue,
212                 I2O_MAX_OUTBOUND_MSG_FRAMES * I2O_OUTBOUND_MSG_FRAME_SIZE *
213                                 sizeof(u32))) {
214                 i2o_pci_free(c);
215                 return -ENOMEM;
216         }
217 
218         pci_set_drvdata(pdev, c);
219 
220         return 0;
221 }
222 
223 /**
224  *      i2o_pci_interrupt - Interrupt handler for I2O controller
225  *      @irq: interrupt line
226  *      @dev_id: pointer to the I2O controller
227  *
228  *      Handle an interrupt from a PCI based I2O controller. This turns out
229  *      to be rather simple. We keep the controller pointer in the cookie.
230  */
231 static irqreturn_t i2o_pci_interrupt(int irq, void *dev_id)
232 {
233         struct i2o_controller *c = dev_id;
234         u32 m;
235         irqreturn_t rc = IRQ_NONE;
236 
237         while (readl(c->irq_status) & I2O_IRQ_OUTBOUND_POST) {
238                 m = readl(c->out_port);
239                 if (m == I2O_QUEUE_EMPTY) {
240                         /*
241                          * Old 960 steppings had a bug in the I2O unit that
242                          * caused the queue to appear empty when it wasn't.
243                          */
244                         m = readl(c->out_port);
245                         if (unlikely(m == I2O_QUEUE_EMPTY))
246                                 break;
247                 }
248 
249                 /* dispatch it */
250                 if (i2o_driver_dispatch(c, m))
251                         /* flush it if result != 0 */
252                         i2o_flush_reply(c, m);
253 
254                 rc = IRQ_HANDLED;
255         }
256 
257         return rc;
258 }
259 
260 /**
261  *      i2o_pci_irq_enable - Allocate interrupt for I2O controller
262  *      @c: i2o_controller that the request is for
263  *
264  *      Allocate an interrupt for the I2O controller, and activate interrupts
265  *      on the I2O controller.
266  *
267  *      Returns 0 on success or negative error code on failure.
268  */
269 static int i2o_pci_irq_enable(struct i2o_controller *c)
270 {
271         struct pci_dev *pdev = c->pdev;
272         int rc;
273 
274         writel(0xffffffff, c->irq_mask);
275 
276         if (pdev->irq) {
277                 rc = request_irq(pdev->irq, i2o_pci_interrupt, IRQF_SHARED,
278                                  c->name, c);
279                 if (rc < 0) {
280                         printk(KERN_ERR "%s: unable to allocate interrupt %d."
281                                "\n", c->name, pdev->irq);
282                         return rc;
283                 }
284         }
285 
286         writel(0x00000000, c->irq_mask);
287 
288         printk(KERN_INFO "%s: Installed at IRQ %d\n", c->name, pdev->irq);
289 
290         return 0;
291 }
292 
293 /**
294  *      i2o_pci_irq_disable - Free interrupt for I2O controller
295  *      @c: I2O controller
296  *
297  *      Disable interrupts in I2O controller and then free interrupt.
298  */
299 static void i2o_pci_irq_disable(struct i2o_controller *c)
300 {
301         writel(0xffffffff, c->irq_mask);
302 
303         if (c->pdev->irq > 0)
304                 free_irq(c->pdev->irq, c);
305 }
306 
307 /**
308  *      i2o_pci_probe - Probe the PCI device for an I2O controller
309  *      @pdev: PCI device to test
310  *      @id: id which matched with the PCI device id table
311  *
312  *      Probe the PCI device for any device which is a memory of the
313  *      Intelligent, I2O class or an Adaptec Zero Channel Controller. We
314  *      attempt to set up each such device and register it with the core.
315  *
316  *      Returns 0 on success or negative error code on failure.
317  */
318 static int i2o_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
319 {
320         struct i2o_controller *c;
321         int rc;
322         struct pci_dev *i960 = NULL;
323 
324         printk(KERN_INFO "i2o: Checking for PCI I2O controllers...\n");
325 
326         if ((pdev->class & 0xff) > 1) {
327                 printk(KERN_WARNING "i2o: %s does not support I2O 1.5 "
328                        "(skipping).\n", pci_name(pdev));
329                 return -ENODEV;
330         }
331 
332         if ((rc = pci_enable_device(pdev))) {
333                 printk(KERN_WARNING "i2o: couldn't enable device %s\n",
334                        pci_name(pdev));
335                 return rc;
336         }
337 
338         if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32))) {
339                 printk(KERN_WARNING "i2o: no suitable DMA found for %s\n",
340                        pci_name(pdev));
341                 rc = -ENODEV;
342                 goto disable;
343         }
344 
345         pci_set_master(pdev);
346 
347         c = i2o_iop_alloc();
348         if (IS_ERR(c)) {
349                 printk(KERN_ERR "i2o: couldn't allocate memory for %s\n",
350                        pci_name(pdev));
351                 rc = PTR_ERR(c);
352                 goto disable;
353         } else
354                 printk(KERN_INFO "%s: controller found (%s)\n", c->name,
355                        pci_name(pdev));
356 
357         c->pdev = pdev;
358         c->device.parent = &pdev->dev;
359 
360         /* Cards that fall apart if you hit them with large I/O loads... */
361         if (pdev->vendor == PCI_VENDOR_ID_NCR && pdev->device == 0x0630) {
362                 c->short_req = 1;
363                 printk(KERN_INFO "%s: Symbios FC920 workarounds activated.\n",
364                        c->name);
365         }
366 
367         if (pdev->subsystem_vendor == PCI_VENDOR_ID_PROMISE) {
368                 /*
369                  * Expose the ship behind i960 for initialization, or it will
370                  * failed
371                  */
372                 i960 = pci_get_slot(c->pdev->bus,
373                                   PCI_DEVFN(PCI_SLOT(c->pdev->devfn), 0));
374 
375                 if (i960) {
376                         pci_write_config_word(i960, 0x42, 0);
377                         pci_dev_put(i960);
378                 }
379 
380                 c->promise = 1;
381                 c->limit_sectors = 1;
382         }
383 
384         if (pdev->subsystem_vendor == PCI_VENDOR_ID_DPT)
385                 c->adaptec = 1;
386 
387         /* Cards that go bananas if you quiesce them before you reset them. */
388         if (pdev->vendor == PCI_VENDOR_ID_DPT) {
389                 c->no_quiesce = 1;
390                 if (pdev->device == 0xa511)
391                         c->raptor = 1;
392 
393                 if (pdev->subsystem_device == 0xc05a) {
394                         c->limit_sectors = 1;
395                         printk(KERN_INFO
396                                "%s: limit sectors per request to %d\n", c->name,
397                                I2O_MAX_SECTORS_LIMITED);
398                 }
399 #ifdef CONFIG_I2O_EXT_ADAPTEC_DMA64
400                 if (sizeof(dma_addr_t) > 4) {
401                         if (pci_set_dma_mask(pdev, DMA_BIT_MASK(64)))
402                                 printk(KERN_INFO "%s: 64-bit DMA unavailable\n",
403                                        c->name);
404                         else {
405                                 c->pae_support = 1;
406                                 printk(KERN_INFO "%s: using 64-bit DMA\n",
407                                        c->name);
408                         }
409                 }
410 #endif
411         }
412 
413         if ((rc = i2o_pci_alloc(c))) {
414                 printk(KERN_ERR "%s: DMA / IO allocation for I2O controller "
415                        "failed\n", c->name);
416                 goto free_controller;
417         }
418 
419         if (i2o_pci_irq_enable(c)) {
420                 printk(KERN_ERR "%s: unable to enable interrupts for I2O "
421                        "controller\n", c->name);
422                 goto free_pci;
423         }
424 
425         if ((rc = i2o_iop_add(c)))
426                 goto uninstall;
427 
428         if (i960)
429                 pci_write_config_word(i960, 0x42, 0x03ff);
430 
431         return 0;
432 
433       uninstall:
434         i2o_pci_irq_disable(c);
435 
436       free_pci:
437         i2o_pci_free(c);
438 
439       free_controller:
440         i2o_iop_free(c);
441 
442       disable:
443         pci_disable_device(pdev);
444 
445         return rc;
446 }
447 
448 /**
449  *      i2o_pci_remove - Removes a I2O controller from the system
450  *      @pdev: I2O controller which should be removed
451  *
452  *      Reset the I2O controller, disable interrupts and remove all allocated
453  *      resources.
454  */
455 static void i2o_pci_remove(struct pci_dev *pdev)
456 {
457         struct i2o_controller *c;
458         c = pci_get_drvdata(pdev);
459 
460         i2o_iop_remove(c);
461         i2o_pci_irq_disable(c);
462         i2o_pci_free(c);
463 
464         pci_disable_device(pdev);
465 
466         printk(KERN_INFO "%s: Controller removed.\n", c->name);
467 
468         put_device(&c->device);
469 };
470 
471 /* PCI driver for I2O controller */
472 static struct pci_driver i2o_pci_driver = {
473         .name = "PCI_I2O",
474         .id_table = i2o_pci_ids,
475         .probe = i2o_pci_probe,
476         .remove = i2o_pci_remove,
477 };
478 
479 /**
480  *      i2o_pci_init - registers I2O PCI driver in PCI subsystem
481  *
482  *      Returns > 0 on success or negative error code on failure.
483  */
484 int __init i2o_pci_init(void)
485 {
486         return pci_register_driver(&i2o_pci_driver);
487 };
488 
489 /**
490  *      i2o_pci_exit - unregisters I2O PCI driver from PCI subsystem
491  */
492 void __exit i2o_pci_exit(void)
493 {
494         pci_unregister_driver(&i2o_pci_driver);
495 };
496 
497 MODULE_DEVICE_TABLE(pci, i2o_pci_ids);
498 

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