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/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1999, 2000, 04, 06 Ralf Baechle (ralf@linux-mips.org)
* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
*/
#include <linux/pci.h>
#include <asm/paccess.h>
#include <asm/pci/bridge.h>
#include <asm/sn/arch.h>
#include <asm/sn/intr.h>
#include <asm/sn/sn0/hub.h>
/*
* Most of the IOC3 PCI config register aren't present
* we emulate what is needed for a normal PCI enumeration
*/
static u32 emulate_ioc3_cfg(int where, int size)
{
if (size == 1 && where == 0x3d)
return 0x01;
else if (size == 2 && where == 0x3c)
return 0x0100;
else if (size == 4 && where == 0x3c)
return 0x00000100;
return 0;
}
/*
* The Bridge ASIC supports both type 0 and type 1 access. Type 1 is
* not really documented, so right now I can't write code which uses it.
* Therefore we use type 0 accesses for now even though they won't work
* correctly for PCI-to-PCI bridges.
*
* The function is complicated by the ultimate brokenness of the IOC3 chip
* which is used in SGI systems. The IOC3 can only handle 32-bit PCI
* accesses and does only decode parts of it's address space.
*/
static int pci_conf0_read_config(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 * value)
{
struct bridge_controller *bc = BRIDGE_CONTROLLER(bus);
struct bridge_regs *bridge = bc->base;
int slot = PCI_SLOT(devfn);
int fn = PCI_FUNC(devfn);
volatile void *addr;
u32 cf, shift, mask;
int res;
addr = &bridge->b_type0_cfg_dev[slot].f[fn].c[PCI_VENDOR_ID];
if (get_dbe(cf, (u32 *) addr))
return PCIBIOS_DEVICE_NOT_FOUND;
/*
* IOC3 is broken beyond belief ... Don't even give the
* generic PCI code a chance to look at it for real ...
*/
if (cf == (PCI_VENDOR_ID_SGI | (PCI_DEVICE_ID_SGI_IOC3 << 16)))
goto is_ioc3;
addr = &bridge->b_type0_cfg_dev[slot].f[fn].c[where ^ (4 - size)];
if (size == 1)
res = get_dbe(*value, (u8 *) addr);
else if (size == 2)
res = get_dbe(*value, (u16 *) addr);
else
res = get_dbe(*value, (u32 *) addr);
return res ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
is_ioc3:
/*
* IOC3 special handling
*/
if ((where >= 0x14 && where < 0x40) || (where >= 0x48)) {
*value = emulate_ioc3_cfg(where, size);
return PCIBIOS_SUCCESSFUL;
}
addr = &bridge->b_type0_cfg_dev[slot].f[fn].l[where >> 2];
if (get_dbe(cf, (u32 *) addr))
return PCIBIOS_DEVICE_NOT_FOUND;
shift = ((where & 3) << 3);
mask = (0xffffffffU >> ((4 - size) << 3));
*value = (cf >> shift) & mask;
return PCIBIOS_SUCCESSFUL;
}
static int pci_conf1_read_config(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 * value)
{
struct bridge_controller *bc = BRIDGE_CONTROLLER(bus);
struct bridge_regs *bridge = bc->base;
int busno = bus->number;
int slot = PCI_SLOT(devfn);
int fn = PCI_FUNC(devfn);
volatile void *addr;
u32 cf, shift, mask;
int res;
bridge_write(bc, b_pci_cfg, (busno << 16) | (slot << 11));
addr = &bridge->b_type1_cfg.c[(fn << 8) | PCI_VENDOR_ID];
if (get_dbe(cf, (u32 *) addr))
return PCIBIOS_DEVICE_NOT_FOUND;
/*
* IOC3 is broken beyond belief ... Don't even give the
* generic PCI code a chance to look at it for real ...
*/
if (cf == (PCI_VENDOR_ID_SGI | (PCI_DEVICE_ID_SGI_IOC3 << 16)))
goto is_ioc3;
bridge_write(bc, b_pci_cfg, (busno << 16) | (slot << 11));
addr = &bridge->b_type1_cfg.c[(fn << 8) | (where ^ (4 - size))];
if (size == 1)
res = get_dbe(*value, (u8 *) addr);
else if (size == 2)
res = get_dbe(*value, (u16 *) addr);
else
res = get_dbe(*value, (u32 *) addr);
return res ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
is_ioc3:
/*
* IOC3 special handling
*/
if ((where >= 0x14 && where < 0x40) || (where >= 0x48)) {
*value = emulate_ioc3_cfg(where, size);
return PCIBIOS_SUCCESSFUL;
}
bridge_write(bc, b_pci_cfg, (busno << 16) | (slot << 11));
addr = &bridge->b_type1_cfg.c[(fn << 8) | where];
if (get_dbe(cf, (u32 *) addr))
return PCIBIOS_DEVICE_NOT_FOUND;
shift = ((where & 3) << 3);
mask = (0xffffffffU >> ((4 - size) << 3));
*value = (cf >> shift) & mask;
return PCIBIOS_SUCCESSFUL;
}
static int pci_read_config(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 * value)
{
if (!pci_is_root_bus(bus))
return pci_conf1_read_config(bus, devfn, where, size, value);
return pci_conf0_read_config(bus, devfn, where, size, value);
}
static int pci_conf0_write_config(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 value)
{
struct bridge_controller *bc = BRIDGE_CONTROLLER(bus);
struct bridge_regs *bridge = bc->base;
int slot = PCI_SLOT(devfn);
int fn = PCI_FUNC(devfn);
volatile void *addr;
u32 cf, shift, mask, smask;
int res;
addr = &bridge->b_type0_cfg_dev[slot].f[fn].c[PCI_VENDOR_ID];
if (get_dbe(cf, (u32 *) addr))
return PCIBIOS_DEVICE_NOT_FOUND;
/*
* IOC3 is broken beyond belief ... Don't even give the
* generic PCI code a chance to look at it for real ...
*/
if (cf == (PCI_VENDOR_ID_SGI | (PCI_DEVICE_ID_SGI_IOC3 << 16)))
goto is_ioc3;
addr = &bridge->b_type0_cfg_dev[slot].f[fn].c[where ^ (4 - size)];
if (size == 1) {
res = put_dbe(value, (u8 *) addr);
} else if (size == 2) {
res = put_dbe(value, (u16 *) addr);
} else {
res = put_dbe(value, (u32 *) addr);
}
if (res)
return PCIBIOS_DEVICE_NOT_FOUND;
return PCIBIOS_SUCCESSFUL;
is_ioc3:
/*
* IOC3 special handling
*/
if ((where >= 0x14 && where < 0x40) || (where >= 0x48))
return PCIBIOS_SUCCESSFUL;
addr = &bridge->b_type0_cfg_dev[slot].f[fn].l[where >> 2];
if (get_dbe(cf, (u32 *) addr))
return PCIBIOS_DEVICE_NOT_FOUND;
shift = ((where & 3) << 3);
mask = (0xffffffffU >> ((4 - size) << 3));
smask = mask << shift;
cf = (cf & ~smask) | ((value & mask) << shift);
if (put_dbe(cf, (u32 *) addr))
return PCIBIOS_DEVICE_NOT_FOUND;
return PCIBIOS_SUCCESSFUL;
}
static int pci_conf1_write_config(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 value)
{
struct bridge_controller *bc = BRIDGE_CONTROLLER(bus);
struct bridge_regs *bridge = bc->base;
int slot = PCI_SLOT(devfn);
int fn = PCI_FUNC(devfn);
int busno = bus->number;
volatile void *addr;
u32 cf, shift, mask, smask;
int res;
bridge_write(bc, b_pci_cfg, (busno << 16) | (slot << 11));
addr = &bridge->b_type1_cfg.c[(fn << 8) | PCI_VENDOR_ID];
if (get_dbe(cf, (u32 *) addr))
return PCIBIOS_DEVICE_NOT_FOUND;
/*
* IOC3 is broken beyond belief ... Don't even give the
* generic PCI code a chance to look at it for real ...
*/
if (cf == (PCI_VENDOR_ID_SGI | (PCI_DEVICE_ID_SGI_IOC3 << 16)))
goto is_ioc3;
addr = &bridge->b_type1_cfg.c[(fn << 8) | (where ^ (4 - size))];
if (size == 1) {
res = put_dbe(value, (u8 *) addr);
} else if (size == 2) {
res = put_dbe(value, (u16 *) addr);
} else {
res = put_dbe(value, (u32 *) addr);
}
if (res)
return PCIBIOS_DEVICE_NOT_FOUND;
return PCIBIOS_SUCCESSFUL;
is_ioc3:
/*
* IOC3 special handling
*/
if ((where >= 0x14 && where < 0x40) || (where >= 0x48))
return PCIBIOS_SUCCESSFUL;
addr = &bridge->b_type0_cfg_dev[slot].f[fn].l[where >> 2];
if (get_dbe(cf, (u32 *) addr))
return PCIBIOS_DEVICE_NOT_FOUND;
shift = ((where & 3) << 3);
mask = (0xffffffffU >> ((4 - size) << 3));
smask = mask << shift;
cf = (cf & ~smask) | ((value & mask) << shift);
if (put_dbe(cf, (u32 *) addr))
return PCIBIOS_DEVICE_NOT_FOUND;
return PCIBIOS_SUCCESSFUL;
}
static int pci_write_config(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 value)
{
if (!pci_is_root_bus(bus))
return pci_conf1_write_config(bus, devfn, where, size, value);
return pci_conf0_write_config(bus, devfn, where, size, value);
}
struct pci_ops bridge_pci_ops = {
.read = pci_read_config,
.write = pci_write_config,
};
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