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/* -*- pse-c -*-
*-----------------------------------------------------------------------------
* Filename: pci.c
* $Revision: 1.3 $
*-----------------------------------------------------------------------------
* Copyright © 2002-2010, Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
*
*-----------------------------------------------------------------------------
* Description:
* This file contains Linux kernel space PCI API for the OAL abstractions.
*-----------------------------------------------------------------------------
*/
#include <memory.h>
#include <pci.h>
#include <linux/pci.h>
#include <io.h>
#if defined(CONFIG_VGA_ARB)
#include <linux/vgaarb.h>
#endif
//
// This is our local representation of a PCI device.
// This struct is private to this file, and exposed to calling functions
// only through an opaque "os_pci_dev_t" handle.
//
typedef struct _linuxkernel_pci {
struct pci_dev *dev;
unsigned int bus;
unsigned int slot;
unsigned int func;
}linuxkernel_pci_t;
/*----------------------------------------------------------------------
* Function:
*pci_find_device_generic
* Parameters:
*unsigned short vendor,
*unsigned short device,
*os_pci_dev_t os_pci_dev
* Description:
*This function finds a PCI device by going through 255 buses, 32 devices
*and 8 functions and tries to match each ones vendor and device ids with
*the ones given to it as parameters. Stops for the first device it finds
*with a matching vendor and device, so it will not find multiple devices.
*This is _NOT_ an exported OAL
*function.
* Returns:
*os_pci_dev_t
*---------------------------------------------------------------------
*/
static os_pci_dev_t pci_find_device_generic(
unsigned short vendor_id,
unsigned short device_id,
os_pci_dev_t pci_dev_handle
)
{
struct pci_dev *our_device; // Kernel struct for a PCI device
linuxkernel_pci_t *pdev; // Our struct for a PCI device.
// Locate the device, and lock it. Start search at the start of the list.
our_device = pci_get_device(vendor_id, device_id, NULL);
// If we didn't find it, return an error.
if (!our_device){
return (os_pci_dev_t)NULL;
}
// Get the pointer to the destination for the data.
// pci_dev_handle is an opaque pointer to a linuxkernel_pci_t struct
// If there isn't one, allocate it.
pdev = (linuxkernel_pci_t *)pci_dev_handle;
if(!pdev) {
// Caller did not supply a handle to a PCI device struct.
// Allocate one.
pdev = (linuxkernel_pci_t *)OS_ALLOC(sizeof(linuxkernel_pci_t));
if(!pdev) {
return (os_pci_dev_t)NULL;
}
// Zero the destination memory
memset(pdev, 0, sizeof(linuxkernel_pci_t));
}
// Copy over from the kernel struct to our struct.
// It is safe to copy a pointer to the pci_dev, since we
// have a lock on it.
pdev->dev = our_device;
pdev->bus = our_device->bus->number;
pdev->slot = PCI_SLOT(our_device->devfn);
pdev->func = PCI_FUNC(our_device->devfn);
return (os_pci_dev_t)pdev;
}
/*----------------------------------------------------------------------
* Function:
*os_pci_find_device
*
* Parameters:
*unsigned short vendor,
*unsigned short device,
*unsigned short bus,
*unsigned short dev,
*unsigned short func,
*os_pci_dev_t os_pci_dev
*
* Description:
* This function finds a PCI device by scanning the specified bus, dev, func
*and tries to match vendor and device ids with the ones given to it as
*parameters.
*
* Notes: If the bus number is 0xFFFF, then the function searches for that
* vendor_id, device_id pair in the whole PCI topology of the system i.e
* it goes through all the buses, devices, functions in the system
*
* Returns:
*os_pci_dev_t
*---------------------------------------------------------------------
*/
os_pci_dev_t os_pci_find_device(
unsigned short vendor_id,
unsigned short device_id,
unsigned short bus,
unsigned short dev,
unsigned short func,
os_pci_dev_t pci_dev)
{
/* TODO: Right now, Just fallback to pci_find_device_generic
* But we need to implement this
*/
return pci_find_device_generic(vendor_id, device_id, pci_dev);
}
int os_pci_get_slot_address(
os_pci_dev_t pci_dev,
unsigned int *bus,
unsigned int *slot,
unsigned int *func)
{
linuxkernel_pci_t *pdev = (linuxkernel_pci_t *)pci_dev;
EMGD_ASSERT(pdev, "Invalid pci device", 0);
if(bus) {
*bus = pdev->bus;
}
if(slot) {
*slot = pdev->slot;
}
if(func) {
*func = pdev->func;
}
return 0;
}
int os_pci_read_config_8(
os_pci_dev_t pci_dev,
unsigned long offset,
unsigned char* val
)
{
linuxkernel_pci_t *pdev = (linuxkernel_pci_t *)pci_dev;
EMGD_ASSERT(pdev, "Invalid pci device", 0);
EMGD_ASSERT(val, "Invalid pointer", 0);
return pci_read_config_byte(pdev->dev, offset, val);
}
int os_pci_read_config_16(
os_pci_dev_t pci_dev,
unsigned long offset,
unsigned short* val
)
{
linuxkernel_pci_t *pdev = (linuxkernel_pci_t *)pci_dev;
EMGD_ASSERT(pdev, "Invalid pci device", 0);
EMGD_ASSERT(val, "Invalid pointer", 0);
return pci_read_config_word(pdev->dev, offset,val);
}
int os_pci_read_config_32(
os_pci_dev_t pci_dev,
unsigned long offset,
unsigned long* val
)
{
linuxkernel_pci_t *pdev = (linuxkernel_pci_t *)pci_dev;
EMGD_ASSERT(pdev, "Invalid pci device", 0);
EMGD_ASSERT(val, "Invalid pointer", 0);
return pci_read_config_dword(pdev->dev, offset, (u32*)val);
}
int os_pci_write_config_8(
os_pci_dev_t pci_dev,
unsigned long offset,
unsigned char val
)
{
linuxkernel_pci_t *pdev = (linuxkernel_pci_t *)pci_dev;
EMGD_ASSERT(pdev, "Invalid pci device", 0);
return pci_write_config_byte(pdev->dev, offset, val);
}
int os_pci_write_config_16(
os_pci_dev_t pci_dev,
unsigned long offset,
unsigned short val
)
{
linuxkernel_pci_t *pdev = (linuxkernel_pci_t *)pci_dev;
EMGD_ASSERT(pdev, "Invalid pci device", 0);
return pci_write_config_word(pdev->dev, offset, val);
}
int os_pci_write_config_32(
os_pci_dev_t pci_dev,
unsigned long offset,
unsigned long val
)
{
linuxkernel_pci_t *pdev = (linuxkernel_pci_t *)pci_dev;
EMGD_ASSERT(pdev, "Invalid pci device", 0);
return pci_write_config_dword(pdev->dev, offset, val);
}
int os_pci_disable_legacy_vga_decoding(
os_pci_dev_t pci_dev
)
{
#if defined(CONFIG_VGA_ARB)
linuxkernel_pci_t *pdev = (linuxkernel_pci_t *)pci_dev;
EMGD_ASSERT(pdev, "Invalid pci device", 0);
vga_set_legacy_decoding(pdev->dev, VGA_RSRC_NONE);
#else
/* Noop if the VGA arbiter isn't compiled into the kernel */
#endif
return 0;
}
void os_pci_free_device(
os_pci_dev_t pci_dev
)
{
linuxkernel_pci_t *pdev = (linuxkernel_pci_t *)pci_dev;
// Release the lock on our PCI device struct
pci_dev_put(pdev->dev);
// Free our local structure.
OS_FREE(pdev);
return;
}
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