freebsd-dev/sys/dev/ofw/ofw_subr.h
Justin Hibbits 9ed9b26792 Add a ofw_parse_bootargs function, and use it for powerpc
Summary:
If the environment variable is set, U-boot adds a 'bootargs' property to
/chosen.  This is already handled by ARM and MIPS, but should be handled in a
central location.  For now, ofw_subr.c is a good place until we determine if it
should be moved to init_main.c, or somewhere more central to all architectures.

Eventually arm and mips should be modified to use ofw_parse_bootargs() as well,
rather than using the duplicate code already.

Reviewed By: adrian
Differential Revision: https://reviews.freebsd.org/D7846
2016-09-21 02:28:39 +00:00

52 lines
2.3 KiB
C

/*-
* Copyright (c) 2015 Ian Lepore <ian@freebsd.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef _DEV_OFW_OFW_SUBR_H_
#define _DEV_OFW_OFW_SUBR_H_
/*
* Translate an address from the Nth tuple of a device node's reg properties to
* a physical memory address, by applying the range mappings from all ancestors.
* This assumes that all ancestor ranges are simple numerical offsets for which
* addition and subtraction operations will perform the required mapping (the
* bit-options in the high word of standard PCI properties are also handled).
* After the call, *pci_hi (if non-NULL) contains the phys.hi cell of the
* device's parent PCI bus, or OFW_PADDR_NOT_PCI if no PCI bus is involved.
*
* This is intended to be a helper function called by the platform-specific
* implementation of OF_decode_addr(), and not for direct use by device drivers.
*/
#define OFW_PADDR_NOT_PCI (~0)
int ofw_reg_to_paddr(phandle_t _dev, int _regno, bus_addr_t *_paddr,
bus_size_t *_size, pcell_t *_pci_hi);
int ofw_parse_bootargs(void);
#endif