mirror of
https://github.com/torvalds/linux.git
synced 2024-12-15 15:41:58 +00:00
149 lines
4.0 KiB
C
149 lines
4.0 KiB
C
/*
|
|
* Copyright (C) 1999, 2000, 2004, 2005 MIPS Technologies, Inc.
|
|
* All rights reserved.
|
|
* Authors: Carsten Langgaard <carstenl@mips.com>
|
|
* Maciej W. Rozycki <macro@mips.com>
|
|
* Copyright (C) 2005 Ralf Baechle (ralf@linux-mips.org)
|
|
*
|
|
* This program is free software; you can distribute it and/or modify it
|
|
* under the terms 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.,
|
|
* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
|
|
*
|
|
* MIPS boards specific PCI support.
|
|
*
|
|
*/
|
|
#include <linux/types.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
|
|
#include <asm/mips-boards/msc01_pci.h>
|
|
|
|
#define PCI_ACCESS_READ 0
|
|
#define PCI_ACCESS_WRITE 1
|
|
|
|
/*
|
|
* PCI configuration cycle AD bus definition
|
|
*/
|
|
/* Type 0 */
|
|
#define PCI_CFG_TYPE0_REG_SHF 0
|
|
#define PCI_CFG_TYPE0_FUNC_SHF 8
|
|
|
|
/* Type 1 */
|
|
#define PCI_CFG_TYPE1_REG_SHF 0
|
|
#define PCI_CFG_TYPE1_FUNC_SHF 8
|
|
#define PCI_CFG_TYPE1_DEV_SHF 11
|
|
#define PCI_CFG_TYPE1_BUS_SHF 16
|
|
|
|
static int msc_pcibios_config_access(unsigned char access_type,
|
|
struct pci_bus *bus, unsigned int devfn, int where, u32 * data)
|
|
{
|
|
unsigned char busnum = bus->number;
|
|
u32 intr;
|
|
|
|
/* Clear status register bits. */
|
|
MSC_WRITE(MSC01_PCI_INTSTAT,
|
|
(MSC01_PCI_INTCFG_MA_BIT | MSC01_PCI_INTCFG_TA_BIT));
|
|
|
|
MSC_WRITE(MSC01_PCI_CFGADDR,
|
|
((busnum << MSC01_PCI_CFGADDR_BNUM_SHF) |
|
|
(PCI_SLOT(devfn) << MSC01_PCI_CFGADDR_DNUM_SHF) |
|
|
(PCI_FUNC(devfn) << MSC01_PCI_CFGADDR_FNUM_SHF) |
|
|
((where / 4) << MSC01_PCI_CFGADDR_RNUM_SHF)));
|
|
|
|
/* Perform access */
|
|
if (access_type == PCI_ACCESS_WRITE)
|
|
MSC_WRITE(MSC01_PCI_CFGDATA, *data);
|
|
else
|
|
MSC_READ(MSC01_PCI_CFGDATA, *data);
|
|
|
|
/* Detect Master/Target abort */
|
|
MSC_READ(MSC01_PCI_INTSTAT, intr);
|
|
if (intr & (MSC01_PCI_INTCFG_MA_BIT | MSC01_PCI_INTCFG_TA_BIT)) {
|
|
/* Error occurred */
|
|
|
|
/* Clear bits */
|
|
MSC_WRITE(MSC01_PCI_INTSTAT,
|
|
(MSC01_PCI_INTCFG_MA_BIT | MSC01_PCI_INTCFG_TA_BIT));
|
|
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* We can't address 8 and 16 bit words directly. Instead we have to
|
|
* read/write a 32bit word and mask/modify the data we actually want.
|
|
*/
|
|
static int msc_pcibios_read(struct pci_bus *bus, unsigned int devfn,
|
|
int where, int size, u32 * val)
|
|
{
|
|
u32 data = 0;
|
|
|
|
if ((size == 2) && (where & 1))
|
|
return PCIBIOS_BAD_REGISTER_NUMBER;
|
|
else if ((size == 4) && (where & 3))
|
|
return PCIBIOS_BAD_REGISTER_NUMBER;
|
|
|
|
if (msc_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, where,
|
|
&data))
|
|
return -1;
|
|
|
|
if (size == 1)
|
|
*val = (data >> ((where & 3) << 3)) & 0xff;
|
|
else if (size == 2)
|
|
*val = (data >> ((where & 3) << 3)) & 0xffff;
|
|
else
|
|
*val = data;
|
|
|
|
return PCIBIOS_SUCCESSFUL;
|
|
}
|
|
|
|
static int msc_pcibios_write(struct pci_bus *bus, unsigned int devfn,
|
|
int where, int size, u32 val)
|
|
{
|
|
u32 data = 0;
|
|
|
|
if ((size == 2) && (where & 1))
|
|
return PCIBIOS_BAD_REGISTER_NUMBER;
|
|
else if ((size == 4) && (where & 3))
|
|
return PCIBIOS_BAD_REGISTER_NUMBER;
|
|
|
|
if (size == 4)
|
|
data = val;
|
|
else {
|
|
if (msc_pcibios_config_access(PCI_ACCESS_READ, bus, devfn,
|
|
where, &data))
|
|
return -1;
|
|
|
|
if (size == 1)
|
|
data = (data & ~(0xff << ((where & 3) << 3))) |
|
|
(val << ((where & 3) << 3));
|
|
else if (size == 2)
|
|
data = (data & ~(0xffff << ((where & 3) << 3))) |
|
|
(val << ((where & 3) << 3));
|
|
}
|
|
|
|
if (msc_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn, where,
|
|
&data))
|
|
return -1;
|
|
|
|
return PCIBIOS_SUCCESSFUL;
|
|
}
|
|
|
|
struct pci_ops msc_pci_ops = {
|
|
.read = msc_pcibios_read,
|
|
.write = msc_pcibios_write
|
|
};
|