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/*
* Copyright (C) 2016 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., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
* You can also choose to distribute this program under the terms of
* the Unmodified Binary Distribution Licence (as given in the file
* COPYING.UBDL), provided that you have satisfied its requirements.
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <ipxe/io.h>
#include <ipxe/arm_io.h>
/** @file
*
* iPXE I/O API for ARM
*
*/
/** An ARM I/O qword */
union arm32_io_qword {
uint64_t qword;
uint32_t dword[2];
};
/**
* Read 64-bit qword from memory-mapped device
*
* @v io_addr I/O address
* @ret data Value read
*
* This is not atomic for ARM32.
*/
static uint64_t arm32_readq ( volatile uint64_t *io_addr ) {
volatile union arm32_io_qword *ptr =
container_of ( io_addr, union arm32_io_qword, qword );
union arm32_io_qword tmp;
tmp.dword[0] = readl ( &ptr->dword[0] );
tmp.dword[1] = readl ( &ptr->dword[1] );
return tmp.qword;
}
/**
* Write 64-bit qword to memory-mapped device
*
* @v data Value to write
* @v io_addr I/O address
*
* This is not atomic for ARM32.
*/
static void arm32_writeq ( uint64_t data, volatile uint64_t *io_addr ) {
volatile union arm32_io_qword *ptr =
container_of ( io_addr, union arm32_io_qword, qword );
union arm32_io_qword tmp;
tmp.qword = data;
writel ( tmp.dword[0], &ptr->dword[0] );
writel ( tmp.dword[1], &ptr->dword[1] );
}
PROVIDE_IOAPI_INLINE ( arm, phys_to_bus );
PROVIDE_IOAPI_INLINE ( arm, bus_to_phys );
PROVIDE_IOAPI_INLINE ( arm, readb );
PROVIDE_IOAPI_INLINE ( arm, readw );
PROVIDE_IOAPI_INLINE ( arm, readl );
PROVIDE_IOAPI_INLINE ( arm, writeb );
PROVIDE_IOAPI_INLINE ( arm, writew );
PROVIDE_IOAPI_INLINE ( arm, writel );
PROVIDE_IOAPI_INLINE ( arm, iodelay );
PROVIDE_IOAPI_INLINE ( arm, mb );
#ifdef __aarch64__
PROVIDE_IOAPI_INLINE ( arm, readq );
PROVIDE_IOAPI_INLINE ( arm, writeq );
#else
PROVIDE_IOAPI ( arm, readq, arm32_readq );
PROVIDE_IOAPI ( arm, writeq, arm32_writeq );
#endif
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