94 lines
2.6 KiB
C
94 lines
2.6 KiB
C
/*
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* Copyright (C) 2016 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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* You can also choose to distribute this program under the terms of
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* the Unmodified Binary Distribution Licence (as given in the file
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* COPYING.UBDL), provided that you have satisfied its requirements.
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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#include <ipxe/io.h>
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#include <ipxe/arm_io.h>
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/** @file
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*
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* iPXE I/O API for ARM
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*
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*/
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/** An ARM I/O qword */
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union arm32_io_qword {
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uint64_t qword;
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uint32_t dword[2];
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};
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/**
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* Read 64-bit qword from memory-mapped device
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*
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* @v io_addr I/O address
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* @ret data Value read
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*
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* This is not atomic for ARM32.
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*/
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static uint64_t arm32_readq ( volatile uint64_t *io_addr ) {
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volatile union arm32_io_qword *ptr =
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container_of ( io_addr, union arm32_io_qword, qword );
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union arm32_io_qword tmp;
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tmp.dword[0] = readl ( &ptr->dword[0] );
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tmp.dword[1] = readl ( &ptr->dword[1] );
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return tmp.qword;
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}
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/**
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* Write 64-bit qword to memory-mapped device
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*
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* @v data Value to write
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* @v io_addr I/O address
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*
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* This is not atomic for ARM32.
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*/
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static void arm32_writeq ( uint64_t data, volatile uint64_t *io_addr ) {
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volatile union arm32_io_qword *ptr =
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container_of ( io_addr, union arm32_io_qword, qword );
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union arm32_io_qword tmp;
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tmp.qword = data;
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writel ( tmp.dword[0], &ptr->dword[0] );
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writel ( tmp.dword[1], &ptr->dword[1] );
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}
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PROVIDE_IOAPI_INLINE ( arm, phys_to_bus );
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PROVIDE_IOAPI_INLINE ( arm, bus_to_phys );
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PROVIDE_IOAPI_INLINE ( arm, readb );
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PROVIDE_IOAPI_INLINE ( arm, readw );
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PROVIDE_IOAPI_INLINE ( arm, readl );
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PROVIDE_IOAPI_INLINE ( arm, writeb );
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PROVIDE_IOAPI_INLINE ( arm, writew );
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PROVIDE_IOAPI_INLINE ( arm, writel );
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PROVIDE_IOAPI_INLINE ( arm, iodelay );
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PROVIDE_IOAPI_INLINE ( arm, mb );
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#ifdef __aarch64__
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PROVIDE_IOAPI_INLINE ( arm, readq );
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PROVIDE_IOAPI_INLINE ( arm, writeq );
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#else
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PROVIDE_IOAPI ( arm, readq, arm32_readq );
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PROVIDE_IOAPI ( arm, writeq, arm32_writeq );
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#endif
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