102 lines
2.2 KiB
C
102 lines
2.2 KiB
C
#include <linux/types.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/kernel.h>
|
|
|
|
#include <asm/mips-boards/bonito64.h>
|
|
|
|
#include <loongson.h>
|
|
|
|
#define PCI_ACCESS_READ 0
|
|
#define PCI_ACCESS_WRITE 1
|
|
|
|
#define HT1LO_PCICFG_BASE 0x1a000000
|
|
#define HT1LO_PCICFG_BASE_TP1 0x1b000000
|
|
|
|
static int loongson3_pci_config_access(unsigned char access_type,
|
|
struct pci_bus *bus, unsigned int devfn,
|
|
int where, u32 *data)
|
|
{
|
|
unsigned char busnum = bus->number;
|
|
u_int64_t addr, type;
|
|
void *addrp;
|
|
int device = PCI_SLOT(devfn);
|
|
int function = PCI_FUNC(devfn);
|
|
int reg = where & ~3;
|
|
|
|
addr = (busnum << 16) | (device << 11) | (function << 8) | reg;
|
|
if (busnum == 0) {
|
|
if (device > 31)
|
|
return PCIBIOS_DEVICE_NOT_FOUND;
|
|
addrp = (void *)(TO_UNCAC(HT1LO_PCICFG_BASE) | (addr & 0xffff));
|
|
type = 0;
|
|
|
|
} else {
|
|
addrp = (void *)(TO_UNCAC(HT1LO_PCICFG_BASE_TP1) | (addr));
|
|
type = 0x10000;
|
|
}
|
|
|
|
if (access_type == PCI_ACCESS_WRITE)
|
|
writel(*data, addrp);
|
|
else {
|
|
*data = readl(addrp);
|
|
if (*data == 0xffffffff) {
|
|
*data = -1;
|
|
return PCIBIOS_DEVICE_NOT_FOUND;
|
|
}
|
|
}
|
|
return PCIBIOS_SUCCESSFUL;
|
|
}
|
|
|
|
static int loongson3_pci_pcibios_read(struct pci_bus *bus, unsigned int devfn,
|
|
int where, int size, u32 *val)
|
|
{
|
|
u32 data = 0;
|
|
int ret = loongson3_pci_config_access(PCI_ACCESS_READ,
|
|
bus, devfn, where, &data);
|
|
|
|
if (ret != PCIBIOS_SUCCESSFUL)
|
|
return ret;
|
|
|
|
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 loongson3_pci_pcibios_write(struct pci_bus *bus, unsigned int devfn,
|
|
int where, int size, u32 val)
|
|
{
|
|
u32 data = 0;
|
|
int ret;
|
|
|
|
if (size == 4)
|
|
data = val;
|
|
else {
|
|
ret = loongson3_pci_config_access(PCI_ACCESS_READ,
|
|
bus, devfn, where, &data);
|
|
if (ret != PCIBIOS_SUCCESSFUL)
|
|
return ret;
|
|
|
|
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));
|
|
}
|
|
|
|
ret = loongson3_pci_config_access(PCI_ACCESS_WRITE,
|
|
bus, devfn, where, &data);
|
|
|
|
return ret;
|
|
}
|
|
|
|
struct pci_ops loongson_pci_ops = {
|
|
.read = loongson3_pci_pcibios_read,
|
|
.write = loongson3_pci_pcibios_write
|
|
};
|