7a60fd7be8ad4aa3f334a1885e3eaa439305b26a
[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 /* PCI device id table for all I2O controllers */
36 static struct pci_device_id __devinitdata i2o_pci_ids[] = {
37         {PCI_DEVICE_CLASS(PCI_CLASS_INTELLIGENT_I2O << 8, 0xffff00)},
38         {PCI_DEVICE(PCI_VENDOR_ID_DPT, 0xa511)},
39         {.vendor = PCI_VENDOR_ID_INTEL,.device = 0x1962,
40          .subvendor = PCI_VENDOR_ID_PROMISE,.subdevice = PCI_ANY_ID},
41         {0}
42 };
43
44 /**
45  *      i2o_pci_free - Frees the DMA memory for the I2O controller
46  *      @c: I2O controller to free
47  *
48  *      Remove all allocated DMA memory and unmap memory IO regions. If MTRR
49  *      is enabled, also remove it again.
50  */
51 static void i2o_pci_free(struct i2o_controller *c)
52 {
53         struct device *dev;
54
55         dev = &c->pdev->dev;
56
57         i2o_dma_free(dev, &c->out_queue);
58         i2o_dma_free(dev, &c->status_block);
59         kfree(c->lct);
60         i2o_dma_free(dev, &c->dlct);
61         i2o_dma_free(dev, &c->hrt);
62         i2o_dma_free(dev, &c->status);
63
64         if (c->raptor && c->in_queue.virt)
65                 iounmap(c->in_queue.virt);
66
67         if (c->base.virt)
68                 iounmap(c->base.virt);
69 }
70
71 /**
72  *      i2o_pci_alloc - Allocate DMA memory, map IO memory for I2O controller
73  *      @c: I2O controller
74  *
75  *      Allocate DMA memory for a PCI (or in theory AGP) I2O controller. All
76  *      IO mappings are also done here. If MTRR is enabled, also do add memory
77  *      regions here.
78  *
79  *      Returns 0 on success or negative error code on failure.
80  */
81 static int __devinit i2o_pci_alloc(struct i2o_controller *c)
82 {
83         struct pci_dev *pdev = c->pdev;
84         struct device *dev = &pdev->dev;
85         int i;
86
87         for (i = 0; i < 6; i++) {
88                 /* Skip I/O spaces */
89                 if (!(pci_resource_flags(pdev, i) & IORESOURCE_IO)) {
90                         if (!c->base.phys) {
91                                 c->base.phys = pci_resource_start(pdev, i);
92                                 c->base.len = pci_resource_len(pdev, i);
93
94                                 /*
95                                  * If we know what card it is, set the size
96                                  * correctly. Code is taken from dpt_i2o.c
97                                  */
98                                 if (pdev->device == 0xa501) {
99                                         if (pdev->subsystem_device >= 0xc032 &&
100                                             pdev->subsystem_device <= 0xc03b) {
101                                                 if (c->base.len > 0x400000)
102                                                         c->base.len = 0x400000;
103                                         } else {
104                                                 if (c->base.len > 0x100000)
105                                                         c->base.len = 0x100000;
106                                         }
107                                 }
108                                 if (!c->raptor)
109                                         break;
110                         } else {
111                                 c->in_queue.phys = pci_resource_start(pdev, i);
112                                 c->in_queue.len = pci_resource_len(pdev, i);
113                                 break;
114                         }
115                 }
116         }
117
118         if (i == 6) {
119                 printk(KERN_ERR "%s: I2O controller has no memory regions"
120                        " defined.\n", c->name);
121                 i2o_pci_free(c);
122                 return -EINVAL;
123         }
124
125         /* Map the I2O controller */
126         if (c->raptor) {
127                 printk(KERN_INFO "%s: PCI I2O controller\n", c->name);
128                 printk(KERN_INFO "     BAR0 at 0x%08lX size=%ld\n",
129                        (unsigned long)c->base.phys, (unsigned long)c->base.len);
130                 printk(KERN_INFO "     BAR1 at 0x%08lX size=%ld\n",
131                        (unsigned long)c->in_queue.phys,
132                        (unsigned long)c->in_queue.len);
133         } else
134                 printk(KERN_INFO "%s: PCI I2O controller at %08lX size=%ld\n",
135                        c->name, (unsigned long)c->base.phys,
136                        (unsigned long)c->base.len);
137
138         c->base.virt = ioremap_nocache(c->base.phys, c->base.len);
139         if (!c->base.virt) {
140                 printk(KERN_ERR "%s: Unable to map controller.\n", c->name);
141                 return -ENOMEM;
142         }
143
144         if (c->raptor) {
145                 c->in_queue.virt =
146                     ioremap_nocache(c->in_queue.phys, c->in_queue.len);
147                 if (!c->in_queue.virt) {
148                         printk(KERN_ERR "%s: Unable to map controller.\n",
149                                c->name);
150                         i2o_pci_free(c);
151                         return -ENOMEM;
152                 }
153         } else
154                 c->in_queue = c->base;
155
156         c->irq_status = c->base.virt + I2O_IRQ_STATUS;
157         c->irq_mask = c->base.virt + I2O_IRQ_MASK;
158         c->in_port = c->base.virt + I2O_IN_PORT;
159         c->out_port = c->base.virt + I2O_OUT_PORT;
160
161         if (i2o_dma_alloc(dev, &c->status, 8, GFP_KERNEL)) {
162                 i2o_pci_free(c);
163                 return -ENOMEM;
164         }
165
166         if (i2o_dma_alloc(dev, &c->hrt, sizeof(i2o_hrt), GFP_KERNEL)) {
167                 i2o_pci_free(c);
168                 return -ENOMEM;
169         }
170
171         if (i2o_dma_alloc(dev, &c->dlct, 8192, GFP_KERNEL)) {
172                 i2o_pci_free(c);
173                 return -ENOMEM;
174         }
175
176         if (i2o_dma_alloc(dev, &c->status_block, sizeof(i2o_status_block),
177                           GFP_KERNEL)) {
178                 i2o_pci_free(c);
179                 return -ENOMEM;
180         }
181
182         if (i2o_dma_alloc
183             (dev, &c->out_queue,
184              I2O_MAX_OUTBOUND_MSG_FRAMES * I2O_OUTBOUND_MSG_FRAME_SIZE *
185              sizeof(u32), GFP_KERNEL)) {
186                 i2o_pci_free(c);
187                 return -ENOMEM;
188         }
189
190         pci_set_drvdata(pdev, c);
191
192         return 0;
193 }
194
195 /**
196  *      i2o_pci_interrupt - Interrupt handler for I2O controller
197  *      @irq: interrupt line
198  *      @dev_id: pointer to the I2O controller
199  *      @r: pointer to registers
200  *
201  *      Handle an interrupt from a PCI based I2O controller. This turns out
202  *      to be rather simple. We keep the controller pointer in the cookie.
203  */
204 static irqreturn_t i2o_pci_interrupt(int irq, void *dev_id, struct pt_regs *r)
205 {
206         struct i2o_controller *c = dev_id;
207         u32 m;
208         irqreturn_t rc = IRQ_NONE;
209
210         while (readl(c->irq_status) & I2O_IRQ_OUTBOUND_POST) {
211                 m = readl(c->out_port);
212                 if (m == I2O_QUEUE_EMPTY) {
213                         /*
214                          * Old 960 steppings had a bug in the I2O unit that
215                          * caused the queue to appear empty when it wasn't.
216                          */
217                         m = readl(c->out_port);
218                         if (unlikely(m == I2O_QUEUE_EMPTY))
219                                 break;
220                 }
221
222                 /* dispatch it */
223                 if (i2o_driver_dispatch(c, m))
224                         /* flush it if result != 0 */
225                         i2o_flush_reply(c, m);
226
227                 rc = IRQ_HANDLED;
228         }
229
230         return rc;
231 }
232
233 /**
234  *      i2o_pci_irq_enable - Allocate interrupt for I2O controller
235  *
236  *      Allocate an interrupt for the I2O controller, and activate interrupts
237  *      on the I2O controller.
238  *
239  *      Returns 0 on success or negative error code on failure.
240  */
241 static int i2o_pci_irq_enable(struct i2o_controller *c)
242 {
243         struct pci_dev *pdev = c->pdev;
244         int rc;
245
246         writel(0xffffffff, c->irq_mask);
247
248         if (pdev->irq) {
249                 rc = request_irq(pdev->irq, i2o_pci_interrupt, SA_SHIRQ,
250                                  c->name, c);
251                 if (rc < 0) {
252                         printk(KERN_ERR "%s: unable to allocate interrupt %d."
253                                "\n", c->name, pdev->irq);
254                         return rc;
255                 }
256         }
257
258         writel(0x00000000, c->irq_mask);
259
260         printk(KERN_INFO "%s: Installed at IRQ %d\n", c->name, pdev->irq);
261
262         return 0;
263 }
264
265 /**
266  *      i2o_pci_irq_disable - Free interrupt for I2O controller
267  *      @c: I2O controller
268  *
269  *      Disable interrupts in I2O controller and then free interrupt.
270  */
271 static void i2o_pci_irq_disable(struct i2o_controller *c)
272 {
273         writel(0xffffffff, c->irq_mask);
274
275         if (c->pdev->irq > 0)
276                 free_irq(c->pdev->irq, c);
277 }
278
279 /**
280  *      i2o_pci_probe - Probe the PCI device for an I2O controller
281  *      @dev: PCI device to test
282  *      @id: id which matched with the PCI device id table
283  *
284  *      Probe the PCI device for any device which is a memory of the
285  *      Intelligent, I2O class or an Adaptec Zero Channel Controller. We
286  *      attempt to set up each such device and register it with the core.
287  *
288  *      Returns 0 on success or negative error code on failure.
289  */
290 static int __devinit i2o_pci_probe(struct pci_dev *pdev,
291                                    const struct pci_device_id *id)
292 {
293         struct i2o_controller *c;
294         int rc;
295         struct pci_dev *i960 = NULL;
296
297         printk(KERN_INFO "i2o: Checking for PCI I2O controllers...\n");
298
299         if ((pdev->class & 0xff) > 1) {
300                 printk(KERN_WARNING "i2o: %s does not support I2O 1.5 "
301                        "(skipping).\n", pci_name(pdev));
302                 return -ENODEV;
303         }
304
305         if ((rc = pci_enable_device(pdev))) {
306                 printk(KERN_WARNING "i2o: couldn't enable device %s\n",
307                        pci_name(pdev));
308                 return rc;
309         }
310
311         if (pci_set_dma_mask(pdev, DMA_32BIT_MASK)) {
312                 printk(KERN_WARNING "i2o: no suitable DMA found for %s\n",
313                        pci_name(pdev));
314                 rc = -ENODEV;
315                 goto disable;
316         }
317
318         pci_set_master(pdev);
319
320         c = i2o_iop_alloc();
321         if (IS_ERR(c)) {
322                 printk(KERN_ERR "i2o: couldn't allocate memory for %s\n",
323                        pci_name(pdev));
324                 rc = PTR_ERR(c);
325                 goto disable;
326         } else
327                 printk(KERN_INFO "%s: controller found (%s)\n", c->name,
328                        pci_name(pdev));
329
330         c->pdev = pdev;
331         c->device.parent = get_device(&pdev->dev);
332
333         /* Cards that fall apart if you hit them with large I/O loads... */
334         if (pdev->vendor == PCI_VENDOR_ID_NCR && pdev->device == 0x0630) {
335                 c->short_req = 1;
336                 printk(KERN_INFO "%s: Symbios FC920 workarounds activated.\n",
337                        c->name);
338         }
339
340         if (pdev->subsystem_vendor == PCI_VENDOR_ID_PROMISE) {
341                 /*
342                  * Expose the ship behind i960 for initialization, or it will
343                  * failed
344                  */
345                 i960 =
346                     pci_find_slot(c->pdev->bus->number,
347                                   PCI_DEVFN(PCI_SLOT(c->pdev->devfn), 0));
348
349                 if (i960)
350                         pci_write_config_word(i960, 0x42, 0);
351
352                 c->promise = 1;
353                 c->limit_sectors = 1;
354         }
355
356         if (pdev->subsystem_vendor == PCI_VENDOR_ID_DPT)
357                 c->adaptec = 1;
358
359         /* Cards that go bananas if you quiesce them before you reset them. */
360         if (pdev->vendor == PCI_VENDOR_ID_DPT) {
361                 c->no_quiesce = 1;
362                 if (pdev->device == 0xa511)
363                         c->raptor = 1;
364
365                 if (pdev->subsystem_device == 0xc05a) {
366                         c->limit_sectors = 1;
367                         printk(KERN_INFO
368                                "%s: limit sectors per request to %d\n", c->name,
369                                I2O_MAX_SECTORS_LIMITED);
370                 }
371 #ifdef CONFIG_I2O_EXT_ADAPTEC_DMA64
372                 if (sizeof(dma_addr_t) > 4) {
373                         if (pci_set_dma_mask(pdev, DMA_64BIT_MASK))
374                                 printk(KERN_INFO "%s: 64-bit DMA unavailable\n",
375                                        c->name);
376                         else {
377                                 c->pae_support = 1;
378                                 printk(KERN_INFO "%s: using 64-bit DMA\n",
379                                        c->name);
380                         }
381                 }
382 #endif
383         }
384
385         if ((rc = i2o_pci_alloc(c))) {
386                 printk(KERN_ERR "%s: DMA / IO allocation for I2O controller "
387                        " failed\n", c->name);
388                 goto free_controller;
389         }
390
391         if (i2o_pci_irq_enable(c)) {
392                 printk(KERN_ERR "%s: unable to enable interrupts for I2O "
393                        "controller\n", c->name);
394                 goto free_pci;
395         }
396
397         if ((rc = i2o_iop_add(c)))
398                 goto uninstall;
399
400         get_device(&c->device);
401
402         if (i960)
403                 pci_write_config_word(i960, 0x42, 0x03ff);
404
405         return 0;
406
407       uninstall:
408         i2o_pci_irq_disable(c);
409
410       free_pci:
411         i2o_pci_free(c);
412
413       free_controller:
414         i2o_iop_free(c);
415         put_device(c->device.parent);
416
417       disable:
418         pci_disable_device(pdev);
419
420         return rc;
421 }
422
423 /**
424  *      i2o_pci_remove - Removes a I2O controller from the system
425  *      pdev: I2O controller which should be removed
426  *
427  *      Reset the I2O controller, disable interrupts and remove all allocated
428  *      resources.
429  */
430 static void __devexit i2o_pci_remove(struct pci_dev *pdev)
431 {
432         struct i2o_controller *c;
433         c = pci_get_drvdata(pdev);
434
435         i2o_iop_remove(c);
436         i2o_pci_irq_disable(c);
437         i2o_pci_free(c);
438
439         pci_disable_device(pdev);
440
441         printk(KERN_INFO "%s: Controller removed.\n", c->name);
442
443         put_device(c->device.parent);
444         put_device(&c->device);
445 };
446
447 /* PCI driver for I2O controller */
448 static struct pci_driver i2o_pci_driver = {
449         .name = "PCI_I2O",
450         .id_table = i2o_pci_ids,
451         .probe = i2o_pci_probe,
452         .remove = __devexit_p(i2o_pci_remove),
453 };
454
455 /**
456  *      i2o_pci_init - registers I2O PCI driver in PCI subsystem
457  *
458  *      Returns > 0 on success or negative error code on failure.
459  */
460 int __init i2o_pci_init(void)
461 {
462         return pci_register_driver(&i2o_pci_driver);
463 };
464
465 /**
466  *      i2o_pci_exit - unregisters I2O PCI driver from PCI subsystem
467  */
468 void __exit i2o_pci_exit(void)
469 {
470         pci_unregister_driver(&i2o_pci_driver);
471 };
472 MODULE_DEVICE_TABLE(pci, i2o_pci_ids);