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>
34 /* Module internal functions from other sources */
35 extern struct i2o_controller *i2o_iop_alloc(void);
36 extern void i2o_iop_free(struct i2o_controller *);
38 extern int i2o_iop_add(struct i2o_controller *);
39 extern void i2o_iop_remove(struct i2o_controller *);
41 extern int i2o_driver_dispatch(struct i2o_controller *, u32);
43 /* PCI device id table for all I2O controllers */
44 static struct pci_device_id __devinitdata i2o_pci_ids[] = {
45 {PCI_DEVICE_CLASS(PCI_CLASS_INTELLIGENT_I2O << 8, 0xffff00)},
46 {PCI_DEVICE(PCI_VENDOR_ID_DPT, 0xa511)},
47 {.vendor = PCI_VENDOR_ID_INTEL,.device = 0x1962,
48 .subvendor = PCI_VENDOR_ID_PROMISE,.subdevice = PCI_ANY_ID},
53 * i2o_pci_free - Frees the DMA memory for the I2O controller
54 * @c: I2O controller to free
56 * Remove all allocated DMA memory and unmap memory IO regions. If MTRR
57 * is enabled, also remove it again.
59 static void i2o_pci_free(struct i2o_controller *c)
65 i2o_dma_free(dev, &c->out_queue);
66 i2o_dma_free(dev, &c->status_block);
68 i2o_dma_free(dev, &c->dlct);
69 i2o_dma_free(dev, &c->hrt);
70 i2o_dma_free(dev, &c->status);
72 if (c->raptor && c->in_queue.virt)
73 iounmap(c->in_queue.virt);
76 iounmap(c->base.virt);
80 * i2o_pci_alloc - Allocate DMA memory, map IO memory for I2O controller
83 * Allocate DMA memory for a PCI (or in theory AGP) I2O controller. All
84 * IO mappings are also done here. If MTRR is enabled, also do add memory
87 * Returns 0 on success or negative error code on failure.
89 static int __devinit i2o_pci_alloc(struct i2o_controller *c)
91 struct pci_dev *pdev = c->pdev;
92 struct device *dev = &pdev->dev;
95 for (i = 0; i < 6; i++) {
97 if (!(pci_resource_flags(pdev, i) & IORESOURCE_IO)) {
99 c->base.phys = pci_resource_start(pdev, i);
100 c->base.len = pci_resource_len(pdev, i);
103 * If we know what card it is, set the size
104 * correctly. Code is taken from dpt_i2o.c
106 if (pdev->device == 0xa501) {
107 if (pdev->subsystem_device >= 0xc032 &&
108 pdev->subsystem_device <= 0xc03b) {
109 if (c->base.len > 0x400000)
110 c->base.len = 0x400000;
112 if (c->base.len > 0x100000)
113 c->base.len = 0x100000;
119 c->in_queue.phys = pci_resource_start(pdev, i);
120 c->in_queue.len = pci_resource_len(pdev, i);
127 printk(KERN_ERR "%s: I2O controller has no memory regions"
128 " defined.\n", c->name);
133 /* Map the I2O controller */
135 printk(KERN_INFO "%s: PCI I2O controller\n", c->name);
136 printk(KERN_INFO " BAR0 at 0x%08lX size=%ld\n",
137 (unsigned long)c->base.phys, (unsigned long)c->base.len);
138 printk(KERN_INFO " BAR1 at 0x%08lX size=%ld\n",
139 (unsigned long)c->in_queue.phys,
140 (unsigned long)c->in_queue.len);
142 printk(KERN_INFO "%s: PCI I2O controller at %08lX size=%ld\n",
143 c->name, (unsigned long)c->base.phys,
144 (unsigned long)c->base.len);
146 c->base.virt = ioremap_nocache(c->base.phys, c->base.len);
148 printk(KERN_ERR "%s: Unable to map controller.\n", c->name);
154 ioremap_nocache(c->in_queue.phys, c->in_queue.len);
155 if (!c->in_queue.virt) {
156 printk(KERN_ERR "%s: Unable to map controller.\n",
162 c->in_queue = c->base;
164 c->irq_status = c->base.virt + I2O_IRQ_STATUS;
165 c->irq_mask = c->base.virt + I2O_IRQ_MASK;
166 c->in_port = c->base.virt + I2O_IN_PORT;
167 c->out_port = c->base.virt + I2O_OUT_PORT;
169 if (i2o_dma_alloc(dev, &c->status, 8, GFP_KERNEL)) {
174 if (i2o_dma_alloc(dev, &c->hrt, sizeof(i2o_hrt), GFP_KERNEL)) {
179 if (i2o_dma_alloc(dev, &c->dlct, 8192, GFP_KERNEL)) {
184 if (i2o_dma_alloc(dev, &c->status_block, sizeof(i2o_status_block),
190 if (i2o_dma_alloc(dev, &c->out_queue, MSG_POOL_SIZE, GFP_KERNEL)) {
195 pci_set_drvdata(pdev, c);
201 * i2o_pci_interrupt - Interrupt handler for I2O controller
202 * @irq: interrupt line
203 * @dev_id: pointer to the I2O controller
204 * @r: pointer to registers
206 * Handle an interrupt from a PCI based I2O controller. This turns out
207 * to be rather simple. We keep the controller pointer in the cookie.
209 static irqreturn_t i2o_pci_interrupt(int irq, void *dev_id, struct pt_regs *r)
211 struct i2o_controller *c = dev_id;
213 irqreturn_t rc = IRQ_NONE;
215 while (readl(c->irq_status) & I2O_IRQ_OUTBOUND_POST) {
216 m = readl(c->out_port);
217 if (m == I2O_QUEUE_EMPTY) {
219 * Old 960 steppings had a bug in the I2O unit that
220 * caused the queue to appear empty when it wasn't.
222 m = readl(c->out_port);
223 if (unlikely(m == I2O_QUEUE_EMPTY))
228 if (i2o_driver_dispatch(c, m))
229 /* flush it if result != 0 */
230 i2o_flush_reply(c, m);
239 * i2o_pci_irq_enable - Allocate interrupt for I2O controller
241 * Allocate an interrupt for the I2O controller, and activate interrupts
242 * on the I2O controller.
244 * Returns 0 on success or negative error code on failure.
246 static int i2o_pci_irq_enable(struct i2o_controller *c)
248 struct pci_dev *pdev = c->pdev;
252 writel(0xffffffff, c->irq_mask);
256 rc = request_irq(pdev->irq, i2o_pci_interrupt, SA_SHIRQ,
259 printk(KERN_ERR "%s: unable to allocate interrupt %d."
260 "\n", c->name, pdev->irq);
265 writel(0x00000000, c->irq_mask);
268 printk(KERN_INFO "%s: Installed at IRQ %d\n", c->name, pdev->irq);
274 * i2o_pci_irq_disable - Free interrupt for I2O controller
277 * Disable interrupts in I2O controller and then free interrupt.
279 static void i2o_pci_irq_disable(struct i2o_controller *c)
282 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;
307 printk(KERN_INFO "i2o: Checking for PCI I2O controllers...\n");
309 if ((pdev->class & 0xff) > 1) {
310 printk(KERN_WARNING "i2o: %s does not support I2O 1.5 "
311 "(skipping).\n", pci_name(pdev));
315 if ((rc = pci_enable_device(pdev))) {
316 printk(KERN_WARNING "i2o: couldn't enable device %s\n",
321 if (pci_set_dma_mask(pdev, DMA_32BIT_MASK)) {
322 printk(KERN_WARNING "i2o: no suitable DMA found for %s\n",
328 pci_set_master(pdev);
332 printk(KERN_ERR "i2o: couldn't allocate memory for %s\n",
337 printk(KERN_INFO "%s: controller found (%s)\n", c->name,
341 c->device.parent = get_device(&pdev->dev);
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) {
346 printk(KERN_INFO "%s: Symbios FC920 workarounds activated.\n",
350 if (pdev->subsystem_vendor == PCI_VENDOR_ID_PROMISE) {
352 * Expose the ship behind i960 for initialization, or it will
356 pci_find_slot(c->pdev->bus->number,
357 PCI_DEVFN(PCI_SLOT(c->pdev->devfn), 0));
360 pci_write_config_word(i960, 0x42, 0);
365 /* Cards that go bananas if you quiesce them before you reset them. */
366 if (pdev->vendor == PCI_VENDOR_ID_DPT) {
368 if (pdev->device == 0xa511)
372 if ((rc = i2o_pci_alloc(c))) {
373 printk(KERN_ERR "%s: DMA / IO allocation for I2O controller "
374 " failed\n", c->name);
375 goto free_controller;
378 if (i2o_pci_irq_enable(c)) {
379 printk(KERN_ERR "%s: unable to enable interrupts for I2O "
380 "controller\n", c->name);
384 if ((rc = i2o_iop_add(c)))
388 pci_write_config_word(i960, 0x42, 0x03ff);
390 get_device(&c->device);
395 i2o_pci_irq_disable(c);
402 put_device(c->device.parent);
405 pci_disable_device(pdev);
411 * i2o_pci_remove - Removes a I2O controller from the system
412 * pdev: I2O controller which should be removed
414 * Reset the I2O controller, disable interrupts and remove all allocated
417 static void __devexit i2o_pci_remove(struct pci_dev *pdev)
419 struct i2o_controller *c;
420 c = pci_get_drvdata(pdev);
423 i2o_pci_irq_disable(c);
426 pci_disable_device(pdev);
428 printk(KERN_INFO "%s: Controller removed.\n", c->name);
430 put_device(c->device.parent);
431 put_device(&c->device);
434 /* PCI driver for I2O controller */
435 static struct pci_driver i2o_pci_driver = {
437 .id_table = i2o_pci_ids,
438 .probe = i2o_pci_probe,
439 .remove = __devexit_p(i2o_pci_remove),
443 * i2o_pci_init - registers I2O PCI driver in PCI subsystem
445 * Returns > 0 on success or negative error code on failure.
447 int __init i2o_pci_init(void)
449 return pci_register_driver(&i2o_pci_driver);
453 * i2o_pci_exit - unregisters I2O PCI driver from PCI subsystem
455 void __exit i2o_pci_exit(void)
457 pci_unregister_driver(&i2o_pci_driver);
460 EXPORT_SYMBOL(i2o_dma_realloc);
461 MODULE_DEVICE_TABLE(pci, i2o_pci_ids);