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// SPDX-License-Identifier: GPL-2.0
#include <linux/kernel.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 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)
{
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;
err = nile4_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, where,
&data);
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)
{
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;
err = nile4_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, where,
&data);
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,
};
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