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/*
* Carsten Langgaard, carstenl@mips.com
* Copyright (C) 1999, 2000 MIPS Technologies, Inc. All rights reserved.
*
* 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/config.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <asm/mips-boards/bonito64.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 bonito64_pcibios_config_access(unsigned char access_type,
struct pci_bus *bus,
unsigned int devfn, int where,
u32 * data)
{
unsigned char busnum = bus->number;
u32 dummy;
u64 pci_addr;
/* Algorithmics Bonito64 system controller. */
if ((busnum == 0) && (PCI_SLOT(devfn) > 21)) {
/* We number bus 0 devices from 0..21 */
return -1;
}
#ifdef CONFIG_MIPS_BOARDS_GEN
if ((busnum == 0) && (PCI_SLOT(devfn) == 17)) {
/* MIPS Core boards have Bonito connected as device 17 */
return -1;
}
#endif
/* Clear cause register bits */
BONITO_PCICMD |= (BONITO_PCICMD_MABORT_CLR |
BONITO_PCICMD_MTABORT_CLR);
/*
* Setup pattern to be used as PCI "address" for
* Type 0 cycle
*/
if (busnum == 0) {
/* IDSEL */
pci_addr = (u64) 1 << (PCI_SLOT(devfn) + 10);
} else {
/* Bus number */
pci_addr = busnum << PCI_CFG_TYPE1_BUS_SHF;
/* Device number */
pci_addr |=
PCI_SLOT(devfn) << PCI_CFG_TYPE1_DEV_SHF;
}
/* Function (same for Type 0/1) */
pci_addr |= PCI_FUNC(devfn) << PCI_CFG_TYPE0_FUNC_SHF;
/* Register number (same for Type 0/1) */
pci_addr |= (where & ~0x3) << PCI_CFG_TYPE0_REG_SHF;
if (busnum == 0) {
/* Type 0 */
BONITO_PCIMAP_CFG = pci_addr >> 16;
} else {
/* Type 1 */
BONITO_PCIMAP_CFG = (pci_addr >> 16) | 0x10000;
}
pci_addr &= 0xffff;
/* Flush Bonito register block */
dummy = BONITO_PCIMAP_CFG;
iob(); /* sync */
/* Perform access */
if (access_type == PCI_ACCESS_WRITE) {
*(volatile u32 *) (_pcictrl_bonito_pcicfg + (u32)pci_addr) = *(u32 *) data;
/* Wait till done */
while (BONITO_PCIMSTAT & 0xF);
} else {
*(u32 *) data = *(volatile u32 *) (_pcictrl_bonito_pcicfg + (u32)pci_addr);
}
/* Detect Master/Target abort */
if (BONITO_PCICMD & (BONITO_PCICMD_MABORT_CLR |
BONITO_PCICMD_MTABORT_CLR)) {
/* Error occurred */
/* Clear bits */
BONITO_PCICMD |= (BONITO_PCICMD_MABORT_CLR |
BONITO_PCICMD_MTABORT_CLR);
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 bonito64_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 (bonito64_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 bonito64_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 (bonito64_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 (bonito64_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn, where,
&data))
return -1;
return PCIBIOS_SUCCESSFUL;
}
struct pci_ops bonito64_pci_ops = {
.read = bonito64_pcibios_read,
.write = bonito64_pcibios_write
};
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