forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
79 lines
2.4 KiB
79 lines
2.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
|
* PCI operations for the Sega Dreamcast |
|
* |
|
* Copyright (C) 2001, 2002 M. R. Brown |
|
* Copyright (C) 2002, 2003 Paul Mundt |
|
*/ |
|
|
|
#include <linux/sched.h> |
|
#include <linux/kernel.h> |
|
#include <linux/param.h> |
|
#include <linux/interrupt.h> |
|
#include <linux/init.h> |
|
#include <linux/irq.h> |
|
#include <linux/pci.h> |
|
#include <linux/module.h> |
|
#include <linux/io.h> |
|
#include <mach/pci.h> |
|
|
|
/* |
|
* The !gapspci_config_access case really shouldn't happen, ever, unless |
|
* someone implicitly messes around with the last devfn value.. otherwise we |
|
* only support a single device anyways, and if we didn't have a BBA, we |
|
* wouldn't make it terribly far through the PCI setup anyways. |
|
* |
|
* Also, we could very easily support both Type 0 and Type 1 configurations |
|
* here, but since it doesn't seem that there is any such implementation in |
|
* existence, we don't bother. |
|
* |
|
* I suppose if someone actually gets around to ripping the chip out of |
|
* the BBA and hanging some more devices off of it, then this might be |
|
* something to take into consideration. However, due to the cost of the BBA, |
|
* and the general lack of activity by DC hardware hackers, this doesn't seem |
|
* likely to happen anytime soon. |
|
*/ |
|
static int gapspci_config_access(unsigned char bus, unsigned int devfn) |
|
{ |
|
return (bus == 0) && (devfn == 0); |
|
} |
|
|
|
/* |
|
* We can also actually read and write in b/w/l sizes! Thankfully this part |
|
* was at least done right, and we don't have to do the stupid masking and |
|
* shifting that we do on the 7751! Small wonders never cease to amaze. |
|
*/ |
|
static int gapspci_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *val) |
|
{ |
|
*val = 0xffffffff; |
|
|
|
if (!gapspci_config_access(bus->number, devfn)) |
|
return PCIBIOS_DEVICE_NOT_FOUND; |
|
|
|
switch (size) { |
|
case 1: *val = inb(GAPSPCI_BBA_CONFIG+where); break; |
|
case 2: *val = inw(GAPSPCI_BBA_CONFIG+where); break; |
|
case 4: *val = inl(GAPSPCI_BBA_CONFIG+where); break; |
|
} |
|
|
|
return PCIBIOS_SUCCESSFUL; |
|
} |
|
|
|
static int gapspci_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val) |
|
{ |
|
if (!gapspci_config_access(bus->number, devfn)) |
|
return PCIBIOS_DEVICE_NOT_FOUND; |
|
|
|
switch (size) { |
|
case 1: outb(( u8)val, GAPSPCI_BBA_CONFIG+where); break; |
|
case 2: outw((u16)val, GAPSPCI_BBA_CONFIG+where); break; |
|
case 4: outl((u32)val, GAPSPCI_BBA_CONFIG+where); break; |
|
} |
|
|
|
return PCIBIOS_SUCCESSFUL; |
|
} |
|
|
|
struct pci_ops gapspci_pci_ops = { |
|
.read = gapspci_read, |
|
.write = gapspci_write, |
|
};
|
|
|