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|
/*
* 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/slab.h>
#include "i2o.h"
#include <linux/module.h>
#include "core.h"
#define OSM_DESCRIPTION "I2O-subsystem"
/* PCI device id table for all I2O controllers */
static struct pci_device_id 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 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.
*/
|