2 * PCI handling of I2O controller
4 * Copyright (C) 1999-2002 Red Hat Software
6 * Written by Alan Cox, Building Number Three Ltd
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.
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
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.
30 #include <linux/pci.h>
31 #include <linux/interrupt.h>
32 #include <linux/i2o.h>
35 #define OSM_DESCRIPTION "I2O-subsystem"
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},
47 * i2o_pci_free - Frees the DMA memory for the I2O controller
48 * @c: I2O controller to free
50 * Remove all allocated DMA memory and unmap memory IO regions. If MTRR
51 * is enabled, also remove it again.
53 static void i2o_pci_free(struct i2o_controller *c)
59 i2o_dma_free(dev, &c->out_queue);
60 i2o_dma_free(dev, &c->status_block);
62 i2o_dma_free(dev, &c->dlct);
63 i2o_dma_free(dev, &c->hrt);
64 i2o_dma_free(dev, &c->status);
66 if (c->raptor && c->in_queue.virt)
67 iounmap(c->in_queue.virt);
70 iounmap(c->base.virt);
72 pci_release_regions(c->pdev);
76 * i2o_pci_alloc - Allocate DMA memory, map IO memory for I2O controller
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
83 * Returns 0 on success or negative error code on failure.
85 static int __devinit i2o_pci_alloc(struct i2o_controller *c)
87 struct pci_dev *pdev = c->pdev;
88 struct device *dev = &pdev->dev;
91 if (pci_request_regions(pdev, OSM_DESCRIPTION)) {
92 printk(KERN_ERR "%s: device already claimed\n", c->name);
96 for (i = 0; i < 6; i++) {
98 if (!(pci_resource_flags(pdev, i) & IORESOURCE_IO)) {
100 c->base.phys = pci_resource_start(pdev, i);
101 c->base.len = pci_resource_len(pdev, i);
104 * If we know what card it is, set the size
105 * correctly. Code is taken from dpt_i2o.c
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;
113 if (c->base.len > 0x100000)
114 c->base.len = 0x100000;
120 c->in_queue.phys = pci_resource_start(pdev, i);
121 c->in_queue.len = pci_resource_len(pdev, i);
128 printk(KERN_ERR "%s: I2O controller has no memory regions"
129 " defined.\n", c->name);
134 /* Map the I2O controller */
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);
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);
147 c->base.virt = ioremap_nocache(c->base.phys, c->base.len);
149 printk(KERN_ERR "%s: Unable to map controller.\n", c->name);
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",
164 c->in_queue = c->base;
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;
171 if (i2o_dma_alloc(dev, &c->status, 8, GFP_KERNEL)) {
176 if (i2o_dma_alloc(dev, &c->hrt, sizeof(i2o_hrt), GFP_KERNEL)) {
181 if (i2o_dma_alloc(dev, &c->dlct, 8192, GFP_KERNEL)) {
186 if (i2o_dma_alloc(dev, &c->status_block, sizeof(i2o_status_block),
194 I2O_MAX_OUTBOUND_MSG_FRAMES * I2O_OUTBOUND_MSG_FRAME_SIZE *
195 sizeof(u32), GFP_KERNEL)) {
200 pci_set_drvdata(pdev, c);
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
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.
214 static irqreturn_t i2o_pci_interrupt(int irq, void *dev_id, struct pt_regs *r)
216 struct i2o_controller *c = dev_id;
218 irqreturn_t rc = IRQ_NONE;
220 while (readl(c->irq_status) & I2O_IRQ_OUTBOUND_POST) {
221 m = readl(c->out_port);
222 if (m == I2O_QUEUE_EMPTY) {
224 * Old 960 steppings had a bug in the I2O unit that
225 * caused the queue to appear empty when it wasn't.
227 m = readl(c->out_port);
228 if (unlikely(m == I2O_QUEUE_EMPTY))
233 if (i2o_driver_dispatch(c, m))
234 /* flush it if result != 0 */
235 i2o_flush_reply(c, m);
244 * i2o_pci_irq_enable - Allocate interrupt for I2O controller
246 * Allocate an interrupt for the I2O controller, and activate interrupts
247 * on the I2O controller.
249 * Returns 0 on success or negative error code on failure.
251 static int i2o_pci_irq_enable(struct i2o_controller *c)
253 struct pci_dev *pdev = c->pdev;
256 writel(0xffffffff, c->irq_mask);
259 rc = request_irq(pdev->irq, i2o_pci_interrupt, SA_SHIRQ,
262 printk(KERN_ERR "%s: unable to allocate interrupt %d."
263 "\n", c->name, pdev->irq);
268 writel(0x00000000, c->irq_mask);
270 printk(KERN_INFO "%s: Installed at IRQ %d\n", c->name, pdev->irq);
276 * i2o_pci_irq_disable - Free interrupt for I2O controller
279 * Disable interrupts in I2O controller and then free interrupt.
281 static void i2o_pci_irq_disable(struct i2o_controller *c)
283 writel(0xffffffff, c->irq_mask);
285 if (c->pdev->irq > 0)
286 free_irq(c->pdev->irq, c);
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
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.
298 * Returns 0 on success or negative error code on failure.
300 static int __devinit i2o_pci_probe(struct pci_dev *pdev,
301 const struct pci_device_id *id)
303 struct i2o_controller *c;
305 struct pci_dev *i960 = NULL;
306 int pci_dev_busy = 0;
308 printk(KERN_INFO "i2o: Checking for PCI I2O controllers...\n");
310 if ((pdev->class & 0xff) > 1) {
311 printk(KERN_WARNING "i2o: %s does not support I2O 1.5 "
312 "(skipping).\n", pci_name(pdev));
316 if ((rc = pci_enable_device(pdev))) {
317 printk(KERN_WARNING "i2o: couldn't enable device %s\n",
322 if (pci_set_dma_mask(pdev, DMA_32BIT_MASK)) {
323 printk(KERN_WARNING "i2o: no suitable DMA found for %s\n",
329 pci_set_master(pdev);
333 printk(KERN_ERR "i2o: couldn't allocate memory for %s\n",
338 printk(KERN_INFO "%s: controller found (%s)\n", c->name,
342 c->device.parent = &pdev->dev;
344 /* Cards that fall apart if you hit them with large I/O loads... */
345 if (pdev->vendor == PCI_VENDOR_ID_NCR && pdev->device == 0x0630) {
347 printk(KERN_INFO "%s: Symbios FC920 workarounds activated.\n",
351 if (pdev->subsystem_vendor == PCI_VENDOR_ID_PROMISE) {
353 * Expose the ship behind i960 for initialization, or it will
357 pci_find_slot(c->pdev->bus->number,
358 PCI_DEVFN(PCI_SLOT(c->pdev->devfn), 0));
361 pci_write_config_word(i960, 0x42, 0);
364 c->limit_sectors = 1;
367 if (pdev->subsystem_vendor == PCI_VENDOR_ID_DPT)
370 /* Cards that go bananas if you quiesce them before you reset them. */
371 if (pdev->vendor == PCI_VENDOR_ID_DPT) {
373 if (pdev->device == 0xa511)
376 if (pdev->subsystem_device == 0xc05a) {
377 c->limit_sectors = 1;
379 "%s: limit sectors per request to %d\n", c->name,
380 I2O_MAX_SECTORS_LIMITED);
382 #ifdef CONFIG_I2O_EXT_ADAPTEC_DMA64
383 if (sizeof(dma_addr_t) > 4) {
384 if (pci_set_dma_mask(pdev, DMA_64BIT_MASK))
385 printk(KERN_INFO "%s: 64-bit DMA unavailable\n",
389 printk(KERN_INFO "%s: using 64-bit DMA\n",
396 if ((rc = i2o_pci_alloc(c))) {
397 printk(KERN_ERR "%s: DMA / IO allocation for I2O controller "
398 " failed\n", c->name);
401 goto free_controller;
404 if (i2o_pci_irq_enable(c)) {
405 printk(KERN_ERR "%s: unable to enable interrupts for I2O "
406 "controller\n", c->name);
410 if ((rc = i2o_iop_add(c)))
414 pci_write_config_word(i960, 0x42, 0x03ff);
419 i2o_pci_irq_disable(c);
429 pci_disable_device(pdev);
435 * i2o_pci_remove - Removes a I2O controller from the system
436 * pdev: I2O controller which should be removed
438 * Reset the I2O controller, disable interrupts and remove all allocated
441 static void __devexit i2o_pci_remove(struct pci_dev *pdev)
443 struct i2o_controller *c;
444 c = pci_get_drvdata(pdev);
447 i2o_pci_irq_disable(c);
450 pci_disable_device(pdev);
452 printk(KERN_INFO "%s: Controller removed.\n", c->name);
454 put_device(&c->device);
457 /* PCI driver for I2O controller */
458 static struct pci_driver i2o_pci_driver = {
460 .id_table = i2o_pci_ids,
461 .probe = i2o_pci_probe,
462 .remove = __devexit_p(i2o_pci_remove),
466 * i2o_pci_init - registers I2O PCI driver in PCI subsystem
468 * Returns > 0 on success or negative error code on failure.
470 int __init i2o_pci_init(void)
472 return pci_register_driver(&i2o_pci_driver);
476 * i2o_pci_exit - unregisters I2O PCI driver from PCI subsystem
478 void __exit i2o_pci_exit(void)
480 pci_unregister_driver(&i2o_pci_driver);
483 MODULE_DEVICE_TABLE(pci, i2o_pci_ids);