[PATCH] I2O: added pci_request_regions() before using the controller
[linux-3.10.git] / 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@redhat.com>:
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/i2o.h>
33 #include "core.h"
34
35 #define OSM_DESCRIPTION "I2O-subsystem"
36
37 /* PCI device id table for all I2O controllers */
38 static struct pci_device_id __devinitdata i2o_pci_ids[] = {
39         {PCI_DEVICE_CLASS(PCI_CLASS_INTELLIGENT_I2O << 8, 0xffff00)},
40         {PCI_DEVICE(PCI_VENDOR_ID_DPT, 0xa511)},
41         {.vendor = PCI_VENDOR_ID_INTEL,.device = 0x1962,
42          .subvendor = PCI_VENDOR_ID_PROMISE,.subdevice = PCI_ANY_ID},
43         {0}
44 };
45
46 /**
47  *      i2o_pci_free - Frees the DMA memory for the I2O controller
48  *      @c: I2O controller to free
49  *
50  *      Remove all allocated DMA memory and unmap memory IO regions. If MTRR
51  *      is enabled, also remove it again.
52  */
53 static void i2o_pci_free(struct i2o_controller *c)
54 {
55         struct device *dev;
56
57         dev = &c->pdev->dev;
58
59         i2o_dma_free(dev, &c->out_queue);
60         i2o_dma_free(dev, &c->status_block);
61         kfree(c->lct);
62         i2o_dma_free(dev, &c->dlct);
63         i2o_dma_free(dev, &c->hrt);
64         i2o_dma_free(dev, &c->status);
65
66         if (c->raptor && c->in_queue.virt)
67                 iounmap(c->in_queue.virt);
68
69         if (c->base.virt)
70                 iounmap(c->base.virt);
71
72         pci_release_regions(c->pdev);
73 }
74
75 /**
76  *      i2o_pci_alloc - Allocate DMA memory, map IO memory for I2O controller
77  *      @c: I2O controller
78  *
79  *      Allocate DMA memory for a PCI (or in theory AGP) I2O controller. All
80  *      IO mappings are also done here. If MTRR is enabled, also do add memory
81  *      regions here.
82  *
83  *      Returns 0 on success or negative error code on failure.
84  */
85 static int __devinit i2o_pci_alloc(struct i2o_controller *c)
86 {
87         struct pci_dev *pdev = c->pdev;
88         struct device *dev = &pdev->dev;
89         int i;
90
91         if (pci_request_regions(pdev, OSM_DESCRIPTION)) {
92                 printk(KERN_ERR "%s: device already claimed\n", c->name);
93                 return -ENODEV;
94         }
95
96         for (i = 0; i < 6; i++) {
97                 /* Skip I/O spaces */
98                 if (!(pci_resource_flags(pdev, i) & IORESOURCE_IO)) {
99                         if (!c->base.phys) {
100                                 c->base.phys = pci_resource_start(pdev, i);
101                                 c->base.len = pci_resource_len(pdev, i);
102
103                                 /*
104                                  * If we know what card it is, set the size
105                                  * correctly. Code is taken from dpt_i2o.c
106                                  */
107                                 if (pdev->device == 0xa501) {
108                                         if (pdev->subsystem_device >= 0xc032 &&
109                                             pdev->subsystem_device <= 0xc03b) {
110                                                 if (c->base.len > 0x400000)
111                                                         c->base.len = 0x400000;
112                                         } else {
113                                                 if (c->base.len > 0x100000)
114                                                         c->base.len = 0x100000;
115                                         }
116                                 }
117                                 if (!c->raptor)
118                                         break;
119                         } else {
120                                 c->in_queue.phys = pci_resource_start(pdev, i);
121                                 c->in_queue.len = pci_resource_len(pdev, i);
122                                 break;
123                         }
124                 }
125         }
126
127         if (i == 6) {
128                 printk(KERN_ERR "%s: I2O controller has no memory regions"
129                        " defined.\n", c->name);
130                 i2o_pci_free(c);
131                 return -EINVAL;
132         }
133
134         /* Map the I2O controller */
135         if (c->raptor) {
136                 printk(KERN_INFO "%s: PCI I2O controller\n", c->name);
137                 printk(KERN_INFO "     BAR0 at 0x%08lX size=%ld\n",
138                        (unsigned long)c->base.phys, (unsigned long)c->base.len);
139                 printk(KERN_INFO "     BAR1 at 0x%08lX size=%ld\n",
140                        (unsigned long)c->in_queue.phys,
141                        (unsigned long)c->in_queue.len);
142         } else
143                 printk(KERN_INFO "%s: PCI I2O controller at %08lX size=%ld\n",
144                        c->name, (unsigned long)c->base.phys,
145                        (unsigned long)c->base.len);
146
147         c->base.virt = ioremap_nocache(c->base.phys, c->base.len);
148         if (!c->base.virt) {
149                 printk(KERN_ERR "%s: Unable to map controller.\n", c->name);
150                 i2o_pci_free(c);
151                 return -ENOMEM;
152         }
153
154         if (c->raptor) {
155                 c->in_queue.virt =
156                     ioremap_nocache(c->in_queue.phys, c->in_queue.len);
157                 if (!c->in_queue.virt) {
158                         printk(KERN_ERR "%s: Unable to map controller.\n",
159                                c->name);
160                         i2o_pci_free(c);
161                         return -ENOMEM;
162                 }
163         } else
164                 c->in_queue = c->base;
165
166         c->irq_status = c->base.virt + I2O_IRQ_STATUS;
167         c->irq_mask = c->base.virt + I2O_IRQ_MASK;
168         c->in_port = c->base.virt + I2O_IN_PORT;
169         c->out_port = c->base.virt + I2O_OUT_PORT;
170
171         if (i2o_dma_alloc(dev, &c->status, 8, GFP_KERNEL)) {
172                 i2o_pci_free(c);
173                 return -ENOMEM;
174         }
175
176         if (i2o_dma_alloc(dev, &c->hrt, sizeof(i2o_hrt), GFP_KERNEL)) {
177                 i2o_pci_free(c);
178                 return -ENOMEM;
179         }
180
181         if (i2o_dma_alloc(dev, &c->dlct, 8192, GFP_KERNEL)) {
182                 i2o_pci_free(c);
183                 return -ENOMEM;
184         }
185
186         if (i2o_dma_alloc(dev, &c->status_block, sizeof(i2o_status_block),
187                           GFP_KERNEL)) {
188                 i2o_pci_free(c);
189                 return -ENOMEM;
190         }
191
192         if (i2o_dma_alloc
193             (dev, &c->out_queue,
194              I2O_MAX_OUTBOUND_MSG_FRAMES * I2O_OUTBOUND_MSG_FRAME_SIZE *
195              sizeof(u32), GFP_KERNEL)) {
196                 i2o_pci_free(c);
197                 return -ENOMEM;
198         }
199
200         pci_set_drvdata(pdev, c);
201
202         return 0;
203 }
204
205 /**
206  *      i2o_pci_interrupt - Interrupt handler for I2O controller
207  *      @irq: interrupt line
208  *      @dev_id: pointer to the I2O controller
209  *      @r: pointer to registers
210  *
211  *      Handle an interrupt from a PCI based I2O controller. This turns out
212  *      to be rather simple. We keep the controller pointer in the cookie.
213  */
214 static irqreturn_t i2o_pci_interrupt(int irq, void *dev_id, struct pt_regs *r)
215 {
216         struct i2o_controller *c = dev_id;
217         u32 m;
218         irqreturn_t rc = IRQ_NONE;
219
220         while (readl(c->irq_status) & I2O_IRQ_OUTBOUND_POST) {
221                 m = readl(c->out_port);
222                 if (m == I2O_QUEUE_EMPTY) {
223                         /*
224                          * Old 960 steppings had a bug in the I2O unit that
225                          * caused the queue to appear empty when it wasn't.
226                          */
227                         m = readl(c->out_port);
228                         if (unlikely(m == I2O_QUEUE_EMPTY))
229                                 break;
230                 }
231
232                 /* dispatch it */
233                 if (i2o_driver_dispatch(c, m))
234                         /* flush it if result != 0 */
235                         i2o_flush_reply(c, m);
236
237                 rc = IRQ_HANDLED;
238         }
239
240         return rc;
241 }
242
243 /**
244  *      i2o_pci_irq_enable - Allocate interrupt for I2O controller
245  *
246  *      Allocate an interrupt for the I2O controller, and activate interrupts
247  *      on the I2O controller.
248  *
249  *      Returns 0 on success or negative error code on failure.
250  */
251 static int i2o_pci_irq_enable(struct i2o_controller *c)
252 {
253         struct pci_dev *pdev = c->pdev;
254         int rc;
255
256         writel(0xffffffff, c->irq_mask);
257
258         if (pdev->irq) {
259                 rc = request_irq(pdev->irq, i2o_pci_interrupt, SA_SHIRQ,
260                                  c->name, c);
261                 if (rc < 0) {
262                         printk(KERN_ERR "%s: unable to allocate interrupt %d."
263                                "\n", c->name, pdev->irq);
264                         return rc;
265                 }
266         }
267
268         writel(0x00000000, c->irq_mask);
269
270         printk(KERN_INFO "%s: Installed at IRQ %d\n", c->name, pdev->irq);
271
272         return 0;
273 }
274
275 /**
276  *      i2o_pci_irq_disable - Free interrupt for I2O controller
277  *      @c: I2O controller
278  *
279  *      Disable interrupts in I2O controller and then free interrupt.
280  */
281 static void i2o_pci_irq_disable(struct i2o_controller *c)
282 {
283         writel(0xffffffff, c->irq_mask);
284
285         if (c->pdev->irq > 0)
286                 free_irq(c->pdev->irq, c);
287 }
288
289 /**
290  *      i2o_pci_probe - Probe the PCI device for an I2O controller
291  *      @dev: PCI device to test
292  *      @id: id which matched with the PCI device id table
293  *
294  *      Probe the PCI device for any device which is a memory of the
295  *      Intelligent, I2O class or an Adaptec Zero Channel Controller. We
296  *      attempt to set up each such device and register it with the core.
297  *
298  *      Returns 0 on success or negative error code on failure.
299  */
300 static int __devinit i2o_pci_probe(struct pci_dev *pdev,
301                                    const struct pci_device_id *id)
302 {
303         struct i2o_controller *c;
304         int rc;
305         struct pci_dev *i960 = NULL;
306
307         printk(KERN_INFO "i2o: Checking for PCI I2O controllers...\n");
308
309         if ((pdev->class & 0xff) > 1) {
310                 printk(KERN_WARNING "i2o: %s does not support I2O 1.5 "
311                        "(skipping).\n", pci_name(pdev));
312                 return -ENODEV;
313         }
314
315         if ((rc = pci_enable_device(pdev))) {
316                 printk(KERN_WARNING "i2o: couldn't enable device %s\n",
317                        pci_name(pdev));
318                 return rc;
319         }
320
321         if (pci_set_dma_mask(pdev, DMA_32BIT_MASK)) {
322                 printk(KERN_WARNING "i2o: no suitable DMA found for %s\n",
323                        pci_name(pdev));
324                 rc = -ENODEV;
325                 goto disable;
326         }
327
328         pci_set_master(pdev);
329
330         c = i2o_iop_alloc();
331         if (IS_ERR(c)) {
332                 printk(KERN_ERR "i2o: couldn't allocate memory for %s\n",
333                        pci_name(pdev));
334                 rc = PTR_ERR(c);
335                 goto disable;
336         } else
337                 printk(KERN_INFO "%s: controller found (%s)\n", c->name,
338                        pci_name(pdev));
339
340         c->pdev = pdev;
341         c->device.parent = get_device(&pdev->dev);
342
343         /* Cards that fall apart if you hit them with large I/O loads... */
344         if (pdev->vendor == PCI_VENDOR_ID_NCR && pdev->device == 0x0630) {
345                 c->short_req = 1;
346                 printk(KERN_INFO "%s: Symbios FC920 workarounds activated.\n",
347                        c->name);
348         }
349
350         if (pdev->subsystem_vendor == PCI_VENDOR_ID_PROMISE) {
351                 /*
352                  * Expose the ship behind i960 for initialization, or it will
353                  * failed
354                  */
355                 i960 =
356                     pci_find_slot(c->pdev->bus->number,
357                                   PCI_DEVFN(PCI_SLOT(c->pdev->devfn), 0));
358
359                 if (i960)
360                         pci_write_config_word(i960, 0x42, 0);
361
362                 c->promise = 1;
363                 c->limit_sectors = 1;
364         }
365
366         if (pdev->subsystem_vendor == PCI_VENDOR_ID_DPT)
367                 c->adaptec = 1;
368
369         /* Cards that go bananas if you quiesce them before you reset them. */
370         if (pdev->vendor == PCI_VENDOR_ID_DPT) {
371                 c->no_quiesce = 1;
372                 if (pdev->device == 0xa511)
373                         c->raptor = 1;
374
375                 if (pdev->subsystem_device == 0xc05a) {
376                         c->limit_sectors = 1;
377                         printk(KERN_INFO
378                                "%s: limit sectors per request to %d\n", c->name,
379                                I2O_MAX_SECTORS_LIMITED);
380                 }
381 #ifdef CONFIG_I2O_EXT_ADAPTEC_DMA64
382                 if (sizeof(dma_addr_t) > 4) {
383                         if (pci_set_dma_mask(pdev, DMA_64BIT_MASK))
384                                 printk(KERN_INFO "%s: 64-bit DMA unavailable\n",
385                                        c->name);
386                         else {
387                                 c->pae_support = 1;
388                                 printk(KERN_INFO "%s: using 64-bit DMA\n",
389                                        c->name);
390                         }
391                 }
392 #endif
393         }
394
395         if ((rc = i2o_pci_alloc(c))) {
396                 printk(KERN_ERR "%s: DMA / IO allocation for I2O controller "
397                        " failed\n", c->name);
398                 goto free_controller;
399         }
400
401         if (i2o_pci_irq_enable(c)) {
402                 printk(KERN_ERR "%s: unable to enable interrupts for I2O "
403                        "controller\n", c->name);
404                 goto free_pci;
405         }
406
407         if ((rc = i2o_iop_add(c)))
408                 goto uninstall;
409
410         get_device(&c->device);
411
412         if (i960)
413                 pci_write_config_word(i960, 0x42, 0x03ff);
414
415         return 0;
416
417       uninstall:
418         i2o_pci_irq_disable(c);
419
420       free_pci:
421         i2o_pci_free(c);
422
423       free_controller:
424         i2o_iop_free(c);
425         put_device(c->device.parent);
426
427       disable:
428         pci_disable_device(pdev);
429
430         return rc;
431 }
432
433 /**
434  *      i2o_pci_remove - Removes a I2O controller from the system
435  *      pdev: I2O controller which should be removed
436  *
437  *      Reset the I2O controller, disable interrupts and remove all allocated
438  *      resources.
439  */
440 static void __devexit i2o_pci_remove(struct pci_dev *pdev)
441 {
442         struct i2o_controller *c;
443         c = pci_get_drvdata(pdev);
444
445         i2o_iop_remove(c);
446         i2o_pci_irq_disable(c);
447         i2o_pci_free(c);
448
449         pci_disable_device(pdev);
450
451         printk(KERN_INFO "%s: Controller removed.\n", c->name);
452
453         put_device(c->device.parent);
454         put_device(&c->device);
455 };
456
457 /* PCI driver for I2O controller */
458 static struct pci_driver i2o_pci_driver = {
459         .name = "PCI_I2O",
460         .id_table = i2o_pci_ids,
461         .probe = i2o_pci_probe,
462         .remove = __devexit_p(i2o_pci_remove),
463 };
464
465 /**
466  *      i2o_pci_init - registers I2O PCI driver in PCI subsystem
467  *
468  *      Returns > 0 on success or negative error code on failure.
469  */
470 int __init i2o_pci_init(void)
471 {
472         return pci_register_driver(&i2o_pci_driver);
473 };
474
475 /**
476  *      i2o_pci_exit - unregisters I2O PCI driver from PCI subsystem
477  */
478 void __exit i2o_pci_exit(void)
479 {
480         pci_unregister_driver(&i2o_pci_driver);
481 };
482 MODULE_DEVICE_TABLE(pci, i2o_pci_ids);