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/*
* Copyright (C) 2008 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <assert.h>
#include <gpxe/io.h>
#include <gpxe/efi/efi.h>
#include <gpxe/efi/Protocol/CpuIo.h>
#include <gpxe/efi/efi_io.h>
/** @file
*
* gPXE I/O API for EFI
*
*/
/** CPU I/O protocol */
static EFI_CPU_IO_PROTOCOL *cpu_io;
EFI_REQUIRE_PROTOCOL ( EFI_CPU_IO_PROTOCOL, &cpu_io );
/** Maximum address that can be used for port I/O */
#define MAX_PORT_ADDRESS 0xffff
/**
* Determine whether or not address is a port I/O address
*
* @v io_addr I/O address
* @v is_port I/O address is a port I/O address
*/
#define IS_PORT_ADDRESS(io_addr) \
( ( ( intptr_t ) (io_addr) ) <= MAX_PORT_ADDRESS )
/**
* Determine EFI CPU I/O width code
*
* @v size Size of value
* @ret width EFI width code
*
* Someone at Intel clearly gets paid by the number of lines of code
* they write. No-one should ever be able to make I/O this
* convoluted. The EFI_CPU_IO_PROTOCOL_WIDTH enum is my favourite
* idiocy.
*/
static EFI_CPU_IO_PROTOCOL_WIDTH efi_width ( size_t size ) {
switch ( size ) {
case 1 : return EfiCpuIoWidthFifoUint8;
case 2 : return EfiCpuIoWidthFifoUint16;
case 4 : return EfiCpuIoWidthFifoUint32;
case 8 : return EfiCpuIoWidthFifoUint64;
default :
assert ( 0 );
/* I wonder what this will actually do... */
return EfiCpuIoWidthMaximum;
}
}
/**
* Read from device
*
* @v io_addr I/O address
* @v size Size of value
* @ret data Value read
*/
unsigned long long efi_ioread ( volatile void *io_addr, size_t size ) {
EFI_CPU_IO_PROTOCOL_IO_MEM read;
unsigned long long data = 0;
EFI_STATUS efirc;
read = ( IS_PORT_ADDRESS ( io_addr ) ?
cpu_io->Io.Read : cpu_io->Mem.Read );
if ( ( efirc = read ( cpu_io, efi_width ( size ),
( intptr_t ) io_addr, 1,
( void * ) &data ) ) != 0 ) {
DBG ( "EFI I/O read at %p failed: %s\n",
io_addr, efi_strerror ( efirc ) );
return -1ULL;
}
return data;
}
/**
* Write to device
*
* @v data Value to write
* @v io_addr I/O address
* @v size Size of value
*/
void efi_iowrite ( unsigned long long data, volatile void *io_addr,
size_t size ) {
EFI_CPU_IO_PROTOCOL_IO_MEM write;
EFI_STATUS efirc;
write = ( IS_PORT_ADDRESS ( io_addr ) ?
cpu_io->Io.Write : cpu_io->Mem.Write );
if ( ( efirc = write ( cpu_io, efi_width ( size ),
( intptr_t ) io_addr, 1,
( void * ) &data ) ) != 0 ) {
DBG ( "EFI I/O write at %p failed: %s\n",
io_addr, efi_strerror ( efirc ) );
}
}
/**
* String read from device
*
* @v io_addr I/O address
* @v data Data buffer
* @v size Size of values
* @v count Number of values to read
*/
void efi_ioreads ( volatile void *io_addr, void *data,
size_t size, unsigned int count ) {
EFI_CPU_IO_PROTOCOL_IO_MEM read;
EFI_STATUS efirc;
read = ( IS_PORT_ADDRESS ( io_addr ) ?
cpu_io->Io.Read : cpu_io->Mem.Read );
if ( ( efirc = read ( cpu_io, efi_width ( size ),
( intptr_t ) io_addr, count,
( void * ) data ) ) != 0 ) {
DBG ( "EFI I/O string read at %p failed: %s\n",
io_addr, efi_strerror ( efirc ) );
}
}
/**
* String write to device
*
* @v io_addr I/O address
* @v data Data buffer
* @v size Size of values
* @v count Number of values to write
*/
void efi_iowrites ( volatile void *io_addr, const void *data,
size_t size, unsigned int count ) {
EFI_CPU_IO_PROTOCOL_IO_MEM write;
EFI_STATUS efirc;
write = ( IS_PORT_ADDRESS ( io_addr ) ?
cpu_io->Io.Write : cpu_io->Mem.Write );
if ( ( efirc = write ( cpu_io, efi_width ( size ),
( intptr_t ) io_addr, count,
( void * ) data ) ) != 0 ) {
DBG ( "EFI I/O write at %p failed: %s\n",
io_addr, efi_strerror ( efirc ) );
}
}
/**
* Wait for I/O-mapped operation to complete
*
*/
static void efi_iodelay ( void ) {
/* Write to non-existent port. Probably x86-only. */
outb ( 0, 0x80 );
}
PROVIDE_IOAPI_INLINE ( efi, phys_to_bus );
PROVIDE_IOAPI_INLINE ( efi, bus_to_phys );
PROVIDE_IOAPI_INLINE ( efi, ioremap );
PROVIDE_IOAPI_INLINE ( efi, iounmap );
PROVIDE_IOAPI_INLINE ( efi, io_to_bus );
PROVIDE_IOAPI_INLINE ( efi, readb );
PROVIDE_IOAPI_INLINE ( efi, readw );
PROVIDE_IOAPI_INLINE ( efi, readl );
PROVIDE_IOAPI_INLINE ( efi, readq );
PROVIDE_IOAPI_INLINE ( efi, writeb );
PROVIDE_IOAPI_INLINE ( efi, writew );
PROVIDE_IOAPI_INLINE ( efi, writel );
PROVIDE_IOAPI_INLINE ( efi, writeq );
PROVIDE_IOAPI_INLINE ( efi, inb );
PROVIDE_IOAPI_INLINE ( efi, inw );
PROVIDE_IOAPI_INLINE ( efi, inl );
PROVIDE_IOAPI_INLINE ( efi, outb );
PROVIDE_IOAPI_INLINE ( efi, outw );
PROVIDE_IOAPI_INLINE ( efi, outl );
PROVIDE_IOAPI_INLINE ( efi, insb );
PROVIDE_IOAPI_INLINE ( efi, insw );
PROVIDE_IOAPI_INLINE ( efi, insl );
PROVIDE_IOAPI_INLINE ( efi, outsb );
PROVIDE_IOAPI_INLINE ( efi, outsw );
PROVIDE_IOAPI_INLINE ( efi, outsl );
PROVIDE_IOAPI ( efi, iodelay, efi_iodelay );
PROVIDE_IOAPI_INLINE ( efi, mb );
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