mirror of
https://github.com/torvalds/linux.git
synced 2024-11-16 17:12:06 +00:00
147 lines
3.5 KiB
C
147 lines
3.5 KiB
C
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/pci.h>
|
|
#include <asm/bootinfo.h>
|
|
|
|
#include <asm/lasat/lasat.h>
|
|
#include <asm/nile4.h>
|
|
|
|
#define PCI_ACCESS_READ 0
|
|
#define PCI_ACCESS_WRITE 1
|
|
|
|
#define LO(reg) (reg / 4)
|
|
#define HI(reg) (reg / 4 + 1)
|
|
|
|
volatile unsigned long *const vrc_pciregs = (void *) Vrc5074_BASE;
|
|
|
|
static DEFINE_SPINLOCK(nile4_pci_lock);
|
|
|
|
static int nile4_pcibios_config_access(unsigned char access_type,
|
|
struct pci_bus *bus, unsigned int devfn, int where, u32 *val)
|
|
{
|
|
unsigned char busnum = bus->number;
|
|
u32 adr, mask, err;
|
|
|
|
if ((busnum == 0) && (PCI_SLOT(devfn) > 8))
|
|
/* The addressing scheme chosen leaves room for just
|
|
* 8 devices on the first busnum (besides the PCI
|
|
* controller itself) */
|
|
return PCIBIOS_DEVICE_NOT_FOUND;
|
|
|
|
if ((busnum == 0) && (devfn == PCI_DEVFN(0, 0))) {
|
|
/* Access controller registers directly */
|
|
if (access_type == PCI_ACCESS_WRITE) {
|
|
vrc_pciregs[(0x200 + where) >> 2] = *val;
|
|
} else {
|
|
*val = vrc_pciregs[(0x200 + where) >> 2];
|
|
}
|
|
return PCIBIOS_SUCCESSFUL;
|
|
}
|
|
|
|
/* Temporarily map PCI Window 1 to config space */
|
|
mask = vrc_pciregs[LO(NILE4_PCIINIT1)];
|
|
vrc_pciregs[LO(NILE4_PCIINIT1)] = 0x0000001a | (busnum ? 0x200 : 0);
|
|
|
|
/* Clear PCI Error register. This also clears the Error Type
|
|
* bits in the Control register */
|
|
vrc_pciregs[LO(NILE4_PCIERR)] = 0;
|
|
vrc_pciregs[HI(NILE4_PCIERR)] = 0;
|
|
|
|
/* Setup address */
|
|
if (busnum == 0)
|
|
adr =
|
|
KSEG1ADDR(PCI_WINDOW1) +
|
|
((1 << (PCI_SLOT(devfn) + 15)) | (PCI_FUNC(devfn) << 8)
|
|
| (where & ~3));
|
|
else
|
|
adr = KSEG1ADDR(PCI_WINDOW1) | (busnum << 16) | (devfn << 8) |
|
|
(where & ~3);
|
|
|
|
if (access_type == PCI_ACCESS_WRITE)
|
|
*(u32 *) adr = *val;
|
|
else
|
|
*val = *(u32 *) adr;
|
|
|
|
/* Check for master or target abort */
|
|
err = (vrc_pciregs[HI(NILE4_PCICTRL)] >> 5) & 0x7;
|
|
|
|
/* Restore PCI Window 1 */
|
|
vrc_pciregs[LO(NILE4_PCIINIT1)] = mask;
|
|
|
|
if (err)
|
|
return PCIBIOS_DEVICE_NOT_FOUND;
|
|
|
|
return PCIBIOS_SUCCESSFUL;
|
|
}
|
|
|
|
static int nile4_pcibios_read(struct pci_bus *bus, unsigned int devfn,
|
|
int where, int size, u32 *val)
|
|
{
|
|
unsigned long flags;
|
|
u32 data = 0;
|
|
int err;
|
|
|
|
if ((size == 2) && (where & 1))
|
|
return PCIBIOS_BAD_REGISTER_NUMBER;
|
|
else if ((size == 4) && (where & 3))
|
|
return PCIBIOS_BAD_REGISTER_NUMBER;
|
|
|
|
spin_lock_irqsave(&nile4_pci_lock, flags);
|
|
err = nile4_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, where,
|
|
&data);
|
|
spin_unlock_irqrestore(&nile4_pci_lock, flags);
|
|
|
|
if (err)
|
|
return err;
|
|
|
|
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 nile4_pcibios_write(struct pci_bus *bus, unsigned int devfn,
|
|
int where, int size, u32 val)
|
|
{
|
|
unsigned long flags;
|
|
u32 data = 0;
|
|
int err;
|
|
|
|
if ((size == 2) && (where & 1))
|
|
return PCIBIOS_BAD_REGISTER_NUMBER;
|
|
else if ((size == 4) && (where & 3))
|
|
return PCIBIOS_BAD_REGISTER_NUMBER;
|
|
|
|
spin_lock_irqsave(&nile4_pci_lock, flags);
|
|
err = nile4_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, where,
|
|
&data);
|
|
spin_unlock_irqrestore(&nile4_pci_lock, flags);
|
|
|
|
if (err)
|
|
return err;
|
|
|
|
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));
|
|
else
|
|
data = val;
|
|
|
|
if (nile4_pcibios_config_access
|
|
(PCI_ACCESS_WRITE, bus, devfn, where, &data))
|
|
return -1;
|
|
|
|
return PCIBIOS_SUCCESSFUL;
|
|
}
|
|
|
|
struct pci_ops nile4_pci_ops = {
|
|
.read = nile4_pcibios_read,
|
|
.write = nile4_pcibios_write,
|
|
};
|