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/*
* Find I2O capable controllers on the PCI bus, and register/install
* them with the I2O layer
*
* (C) Copyright 1999 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.
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/i2o.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/malloc.h>
#include <asm/io.h>
/*
* Free bus specific resources
*/
static void i2o_pci_dispose(struct i2o_controller *c)
{
I2O_IRQ_WRITE32(c,0xFFFFFFFF);
if(c->bus.pci.irq > 0)
free_irq(c->bus.pci.irq, c);
iounmap(((u8 *)c->post_port)-0x40);
}
/*
* No real bus specific handling yet (note that later we will
* need to 'steal' PCI devices on i960 mainboards)
*/
static int i2o_pci_bind(struct i2o_controller *c, struct i2o_device *dev)
{
MOD_INC_USE_COUNT;
return 0;
}
static int i2o_pci_unbind(struct i2o_controller *c, struct i2o_device *dev)
{
MOD_DEC_USE_COUNT;
return 0;
}
/*
* Bus specific interrupt handler
*/
static void i2o_pci_interrupt(int irq, void *dev_id, struct pt_regs *r)
{
struct i2o_controller *c = dev_id;
i2o_run_queue(c);
}
/*
* Install a PCI (or in theory AGP) i2o controller
*/
int __init i2o_pci_install(struct pci_dev *dev)
{
struct i2o_controller *c=kmalloc(sizeof(struct i2o_controller),
GFP_KERNEL);
u8 *mem;
u32 memptr = 0;
u32 size;
int i;
if(c==NULL)
{
printk(KERN_ERR "i2o_pci: insufficient memory to add controller.\n");
return -ENOMEM;
}
memset(c, 0, sizeof(*c));
for(i=0; i<6; i++)
{
/* Skip I/O spaces */
if(!(dev->base_address[i]&PCI_BASE_ADDRESS_SPACE))
{
memptr=PCI_BASE_ADDRESS_MEM_MASK&dev->base_address[i];
break;
}
}
if(i==6)
{
printk(KERN_ERR "i2o_pci: I2O controller has no memory regions defined.\n");
return -ENOMEM;
}
pci_write_config_dword(dev, PCI_BASE_ADDRESS_0+4*i, 0xFFFFFFFF);
pci_read_config_dword(dev, PCI_BASE_ADDRESS_0+4*i, &size);
pci_write_config_dword(dev, PCI_BASE_ADDRESS_0+4*i, dev->base_address[i]);
/* Map the I2O controller */
printk(KERN_INFO "PCI I2O controller at 0x%08X size=%d\n", memptr, -size);
mem = ioremap(memptr, -size);
c->bus.pci.irq = -1;
c->irq_mask = (volatile u32 *)(mem+0x34);
c->post_port = (volatile u32 *)(mem+0x40);
c->reply_port = (volatile u32 *)(mem+0x44);
c->mem_phys = memptr;
c->mem_offset = (u32)mem;
c->destructor = i2o_pci_dispose;
c->bind = i2o_pci_bind;
c->unbind = i2o_pci_unbind;
c->type = I2O_TYPE_PCI;
I2O_IRQ_WRITE32(c,0xFFFFFFFF);
i = i2o_install_controller(c);
if(i<0)
{
printk(KERN_ERR "i2o: unable to install controller.\n");
return i;
}
c->bus.pci.irq = dev->irq;
if(c->bus.pci.irq)
{
i=request_irq(dev->irq, i2o_pci_interrupt, SA_SHIRQ,
c->name, c);
if(i<0)
{
printk(KERN_ERR "%s: unable to allocate interrupt %d.\n",
c->name, dev->irq);
c->bus.pci.irq = -1;
i2o_delete_controller(c);
return -EBUSY;
}
}
return 0;
}
int __init i2o_pci_scan(void)
{
struct pci_dev *dev;
int count=0;
printk(KERN_INFO "Checking for PCI I2O controllers...\n");
for(dev=pci_devices; dev!=NULL; dev=dev->next)
{
if((dev->class>>8)!=PCI_CLASS_INTELLIGENT_I2O)
continue;
if((dev->class&0xFF)>1)
{
printk(KERN_INFO "I2O controller found but does not support I2O 1.5 (skipping).\n");
continue;
}
printk(KERN_INFO "I2O controller on bus %d at %d.\n",
dev->bus->number, dev->devfn);
if(!dev->master)
printk(KERN_WARNING "Controller not master enabled.\n");
if(i2o_pci_install(dev)==0)
count++;
}
if(count)
printk(KERN_INFO "%d I2O controller%s found and installed.\n", count,
count==1?"":"s");
return count?count:-ENODEV;
}
static void i2o_pci_unload(void)
{
int i=0;
struct i2o_controller *c;
for(i = 0; i < MAX_I2O_CONTROLLERS; i++)
{
c=i2o_find_controller(i);
if(c==NULL)
continue;
if(c->type == I2O_TYPE_PCI)
i2o_delete_controller(c);
i2o_unlock_controller(c);
}
}
static void i2o_pci_activate(void)
{
int i=0;
struct i2o_controller *c;
for(i = 0; i < MAX_I2O_CONTROLLERS; i++)
{
c=i2o_find_controller(i);
if(c==NULL)
continue;
if(c->type == I2O_TYPE_PCI)
{
if(i2o_activate_controller(c))
{
printk("I2O: Failed to initialize iop%d\n", c->unit);
i2o_unlock_controller(c);
free_irq(c->bus.pci.irq, c);
i2o_delete_controller(c);
continue;
}
I2O_IRQ_WRITE32(c,0);
}
i2o_unlock_controller(c);
}
}
#ifdef MODULE
EXPORT_NO_SYMBOLS;
MODULE_AUTHOR("Red Hat Software");
MODULE_DESCRIPTION("I2O PCI Interface");
int init_module(void)
{
if(i2o_pci_scan()<0)
return -ENODEV;
i2o_pci_activate();
return 0;
}
void cleanup_module(void)
{
i2o_pci_unload();
}
#endif
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