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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
* Modified by Deepak Saxena <deepak@plexity.net>
* Modified by Boji T Kannanthanam <boji.t.kannanthanam@intel.com>
*
* 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.
*
* TODO:
* Support polled I2O PCI controllers.
*/
#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/slab.h>
#include <asm/io.h>
#ifdef CONFIG_MTRR
#include <asm/mtrr.h>
#endif // CONFIG_MTRR
#ifdef MODULE
/*
* Core function table
* See <include/linux/i2o.h> for an explanation
*/
static struct i2o_core_func_table *core;
/* Core attach function */
extern int i2o_pci_core_attach(struct i2o_core_func_table *);
extern void i2o_pci_core_detach(void);
#endif /* MODULE */
/*
* 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);
#ifdef CONFIG_MTRR
if(c->bus.pci.mtrr_reg0 > 0)
mtrr_del(c->bus.pci.mtrr_reg0, 0, 0);
if(c->bus.pci.mtrr_reg1 > 0)
mtrr_del(c->bus.pci.mtrr_reg1, 0, 0);
#endif
}
/*
* 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 enable/disable functions
*/
static void i2o_pci_enable(struct i2o_controller *c)
{
I2O_IRQ_WRITE32(c, 0);
c->enabled = 1;
}
static void i2o_pci_disable(struct i2o_controller *c)
{
I2O_IRQ_WRITE32(c, 0xFFFFFFFF);
c->enabled = 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;
#ifdef MODULE
core->run_queue(c);
#else
i2o_run_queue(c);
#endif /* MODULE */
}
/*
* Install a PCI (or in theory AGP) i2o controller
*
* TODO: Add support for polled controllers
*/
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: Insufficient memory to add controller.\n");
return -ENOMEM;
}
memset(c, 0, sizeof(*c));
for(i=0; i<6; i++)
{
/* Skip I/O spaces */
if(!(pci_resource_flags(dev, i) & IORESOURCE_IO))
{
memptr = pci_resource_start(dev, i);
break;
}
}
if(i==6)
{
printk(KERN_ERR "i2o: I2O controller has no memory regions defined.\n");
kfree(c);
return -EINVAL;
}
size = dev->resource[i].end-dev->resource[i].start+1;
/* Map the I2O controller */
printk(KERN_INFO "i2o: PCI I2O controller at 0x%08X size=%d\n", memptr, size);
mem = ioremap(memptr, size);
if(mem==NULL)
{
printk(KERN_ERR "i2o: Unable to map controller.\n");
kfree(c);
return -EINVAL;
}
c->bus.pci.irq = -1;
c->bus.pci.queue_buggy = 0;
c->bus.pci.dpt = 0;
c->bus.pci.short_req = 0;
c->pdev = dev;
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->bus_enable = i2o_pci_enable;
c->bus_disable = i2o_pci_disable;
c->type = I2O_TYPE_PCI;
/*
* Cards that fall apart if you hit them with large I/O
* loads...
*/
if(dev->vendor == PCI_VENDOR_ID_NCR && dev->device == 0x0630)
{
c->bus.pci.short_req=1;
printk(KERN_INFO "I2O: Symbios FC920 workarounds activated.\n");
}
if(dev->subsystem_vendor == PCI_VENDOR_ID_PROMISE)
{
c->bus.pci.queue_buggy=1;
if (dev->subsystem_device == 0x0000) /* SX6000 ???? */
c->bus.pci.queue_buggy=2;
printk(KERN_INFO "I2O: Promise workarounds activated.\n");
}
/*
* Cards that go bananas if you quiesce them before you reset
* them
*/
if(dev->vendor == PCI_VENDOR_ID_DPT)
c->bus.pci.dpt=1;
/*
* Enable Write Combining MTRR for IOP's memory region
*/
#ifdef CONFIG_MTRR
c->bus.pci.mtrr_reg0 =
mtrr_add(c->mem_phys, size, MTRR_TYPE_WRCOMB, 1);
/*
* If it is an INTEL i960 I/O processor then set the first 64K to Uncacheable
* since the region contains the Messaging unit which shouldn't be cached.
*/
c->bus.pci.mtrr_reg1 = -1;
if(dev->vendor == PCI_VENDOR_ID_INTEL || dev->vendor == PCI_VENDOR_ID_DPT)
{
printk(KERN_INFO "I2O: MTRR workaround for Intel i960 processor\n");
c->bus.pci.mtrr_reg1 = mtrr_add(c->mem_phys, 65536, MTRR_TYPE_UNCACHABLE, 1);
if(c->bus.pci.mtrr_reg1< 0)
{
printk(KERN_INFO "i2o_pci: Error in setting MTRR_TYPE_UNCACHABLE\n");
mtrr_del(c->bus.pci.mtrr_reg0, c->mem_phys, size);
c->bus.pci.mtrr_reg0 = -1;
}
}
#endif
I2O_IRQ_WRITE32(c,0xFFFFFFFF);
#ifdef MODULE
i = core->install(c);
#else
i = i2o_install_controller(c);
#endif /* MODULE */
if(i<0)
{
printk(KERN_ERR "i2o: Unable to install controller.\n");
kfree(c);
iounmap(mem);
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;
#ifdef MODULE
core->delete(c);
#else
i2o_delete_controller(c);
#endif /* MODULE */
iounmap(mem);
return -EBUSY;
}
}
printk(KERN_INFO "%s: Installed at IRQ%d\n", c->name, dev->irq);
I2O_IRQ_WRITE32(c,0x0);
c->enabled = 1;
return 0;
}
int __init i2o_pci_scan(void)
{
struct pci_dev *dev;
int count=0;
printk(KERN_INFO "i2o: Checking for PCI I2O controllers...\n");
pci_for_each_dev(dev)
{
if((dev->class>>8)!=PCI_CLASS_INTELLIGENT_I2O)
continue;
if(dev->vendor == PCI_VENDOR_ID_DPT)
{
if(dev->device == 0xA501 || dev->device == 0xA511)
{
printk(KERN_INFO "i2o: Skipping Adaptec/DPT I2O raid with preferred native driver.\n");
continue;
}
}
if((dev->class&0xFF)>1)
{
printk(KERN_INFO "i2o: I2O Controller found but does not support I2O 1.5 (skipping).\n");
continue;
}
if (pci_enable_device(dev))
continue;
printk(KERN_INFO "i2o: I2O controller on bus %d at %d.\n",
dev->bus->number, dev->devfn);
pci_set_master(dev);
if(i2o_pci_install(dev)==0)
count++;
}
if(count)
printk(KERN_INFO "i2o: %d I2O controller%s found and installed.\n", count,
count==1?"":"s");
return count?count:-ENODEV;
}
#ifdef I2O_HOTPLUG_SUPPORT
/*
* Activate a newly found PCI I2O controller
* Not used now, but will be needed in future for
* hot plug PCI support
*/
static void i2o_pci_activate(i2o_controller * c)
{
int i=0;
struct i2o_controller *c;
if(c->type == I2O_TYPE_PCI)
{
I2O_IRQ_WRITE32(c,0);
#ifdef MODULE
if(core->activate(c))
#else
if(i2o_activate_controller(c))
#endif /* MODULE */
{
printk("%s: Failed to initialize.\n", c->name);
#ifdef MODULE
core->unlock(c);
core->delete(c);
#else
i2o_unlock_controller(c);
i2o_delete_controller(c);
#endif
continue;
}
}
}
#endif // I2O_HOTPLUG_SUPPORT
#ifdef MODULE
int i2o_pci_core_attach(struct i2o_core_func_table *table)
{
MOD_INC_USE_COUNT;
core = table;
return i2o_pci_scan();
}
void i2o_pci_core_detach(void)
{
core = NULL;
MOD_DEC_USE_COUNT;
}
int init_module(void)
{
printk(KERN_INFO "Linux I2O PCI support (c) 1999 Red Hat Software.\n");
core = NULL;
return 0;
}
void cleanup_module(void)
{
}
EXPORT_SYMBOL(i2o_pci_core_attach);
EXPORT_SYMBOL(i2o_pci_core_detach);
MODULE_AUTHOR("Red Hat Software");
MODULE_DESCRIPTION("I2O PCI Interface");
MODULE_LICENSE("GPL");
#else
void __init i2o_pci_init(void)
{
printk(KERN_INFO "Linux I2O PCI support (c) 1999 Red Hat Software.\n");
i2o_pci_scan();
}
#endif
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