summaryrefslogtreecommitdiffstats
path: root/drivers/message/i2o/pci.c
blob: ed17ac5af3e0d0aa80754d2ca71ebb927165273d (plain)
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
/*
 *	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/i2o.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_32BIT_MASK)) {
		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);
OpenPOWER on IntegriCloud