A pre-busdma pmax <bus.h> skeleton.
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jonathan
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/* $NetBSD: bus.h,v 1.1 1997/06/08 05:10:25 jonathan Exp $ */
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/*
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* Copyright Notice:
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*
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* Copyright (c) 1995, 1996, 1997
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* Jonathan R. Stone. All rights reserved.
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*
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* License:
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*
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* This License applies to this software ("Software"), created
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* by Jonathan Stone ("Author").
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*
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* You may use, copy, modify and redistribute this Software without
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* charge, in either source code form, binary form, or both, on the
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* following conditions:
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*
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* 1. (a) Binary code: (i) a complete copy of the above copyright notice
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* must be included within each copy of the Software in binary code form,
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* and (ii) a complete copy of the above copyright notice and all terms
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* of this License as presented here must be included within each copy of
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* all documentation accompanying or associated with binary code, in any
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* medium, along with a list of the software modules to which the license
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* applies.
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*
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* (b) Source Code: A complete copy of the above copyright notice and all
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* terms of this License as presented here must be included within: (i)
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* each copy of the Software in source code form, and (ii) each copy of
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* all accompanying or associated documentation, in any medium.
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*
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* 2. The following Acknowledgment must be used in communications
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* involving the Software as described below:
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*
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* This product includes software developed by
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* Jonathan Stone for the NetBSD Project.
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*
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* The Acknowledgment must be conspicuously and completely displayed
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* whenever the Software, or any software, products or systems containing
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* the Software, are mentioned in advertising, marketing, informational
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* or publicity materials of any kind, whether in print, electronic or
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* other media (except for information provided to support use of
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* products containing the Software by existing users or customers).
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*
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* 3. The name of the Author may not be used to endorse or promote
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* products derived from this Software without specific prior written
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* permission (conditions (1) and (2) above are not considered
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* endorsement or promotion).
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*
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* 4. This license applies to: (a) all copies of the Software, whether
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* partial or whole, original or modified, and (b) your actions, and the
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* actions of all those who may act on your behalf. All uses not
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* expressly permitted are reserved to the Author.
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*
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* 5. Disclaimer. THIS SOFTWARE IS MADE AVAILABLE BY THE AUTHOR TO THE
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* PUBLIC FOR FREE AND "AS IS.'' ALL USERS OF THIS FREE SOFTWARE ARE
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* SOLELY AND ENTIRELY RESPONSIBLE FOR THEIR OWN CHOICE AND USE OF THIS
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* SOFTWARE FOR THEIR OWN PURPOSES. BY USING THIS SOFTWARE, EACH USER
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* AGREES THAT THE AUTHOR SHALL NOT BE LIABLE FOR DAMAGES OF ANY KIND IN
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* RELATION TO ITS USE OR PERFORMANCE.
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*
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* 6. If you have a special need for a change in one or more of these
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* license conditions, please contact the Author via electronic mail to
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*
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* jonathan@NetBSD.ORG
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*
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* or via the contact information on
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*
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* http://www.NetBSD.ORG/People/Pages/jonathan.html
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*/
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/*
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* NetBSD machine-indepedent bus accessor macros/functions for Decstations.
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*/
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#ifndef _PMAX_BUS_H_
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#define _PMAX_BUS_H_
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/*
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* Bus address and size types
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*/
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typedef u_long bus_addr_t;
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typedef u_long bus_size_t;
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/*
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* Access types for bus resources and addresses.
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*/
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typedef int bus_space_tag_t;
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typedef u_long bus_space_handle_t;
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/*
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* Read or write a 1, 2, or 4-byte quantity from/to a bus-space
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* address, as defined by (space-tag, handle, offset
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*/
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#define bus_space_read_1(t, h, o) \
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(*(volatile u_int8_t *)((h) + (o)))
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#define bus_space_read_2(t, h, o) \
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(*(volatile u_int16_t *)((h) + (o)))
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#define bus_space_read_4(t, h, o) \
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(*(volatile u_int32_t *)((h) + (o)))
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#define bus_space_write_1(t, h, o, v) \
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do { ((void)(*(volatile u_int8_t *)((h) + (o)) = (v))); } while (0)
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#define bus_space_write_2(t, h, o, v) \
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do { ((void)(*(volatile u_int16_t *)((h) + (o)) = (v))); } while (0)
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#define bus_space_write_4(t, h, o, v) \
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do { ((void)(*(volatile u_int32_t *)((h) + (o)) = (v))); } while (0)
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/*
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* Read `count' 1, 2, or 4-byte quantities from bus-space
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* address, defined by (space-tag, handle, offset).
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* Copy to the specified buffer address.
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*/
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#define bus_space_read_multi_1(t, h, o, a, c) \
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do { \
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register int __i ; \
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for (__i = 0; i < (c); i++) \
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((u_char *)(a))[__i] = bus_space_read_1(t, h, o); \
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} while (0)
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#define bus_space_read_multi_2(t, h, o, a, c) \
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do { \
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register int __i ; \
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for (__i = 0; i < (c); i++) \
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((u_int16t_t *)(a))[__i] = bus_space_read_2(t, h, o); \
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} while (0)
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#define bus_space_read_multi_4(t, h, o, a, c) \
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do { \
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register int __i ; \
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for (__i = 0; i < (c); i++) \
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((u_int32_t *)(a))[__i] = bus_space_read_4(t, h, o); \
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} while (0)
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/*
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* Write `count' 1, 2, or 4-byte quantities to a bus-space
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* address, defined by (space-tag, handle, offset).
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* Copy from the specified buffer address.
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*/
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#define bus_space_write_multi_1(t, h, o, a, c) \
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do { \
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register int __i ; \
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for (__i = 0; i < (c); i++) \
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bus_space_write_1(t, h, o, ((u_char *)(a))[__i]); \
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} while (0)
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#define bus_space_write_multi_2(t, h, o, a, c) \
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do { \
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register int __i ; \
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for (__i = 0; i < (c); i++) \
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bus_space_write_2(t, h, o, ((u_int16_t *)(a))[__i]); \
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} while (0)
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#define bus_space_write_multi_4(t, h, o, a, c) \
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do { \
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register int __i ; \
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for (__i = 0; i < (c); i++) \
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bus_space_write_4(t, h, o, ((u_int32_t *)(a))[__i]); \
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} while (0)
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/*
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* Copy `count' 1, 2, or 4-byte values from one bus-space address
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* (t, h, o triple) to another.
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*/
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#define bus_space_copy_multi_1(t, h1, h2, o1, o2, c) \
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do { \
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register int __i ; \
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for (__i = 0; i < (c); i++) \
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bus_space_write_1(t, h1, o1, bus_space_read_1(t, h2, o2)); \
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} while (0)
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#define bus_space_copy_multi_2(t, h1, h2, o1, o2, c) \
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do { \
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register int __i ; \
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for (__i = 0; i < (c); i++) \
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bus_space_write_2(t, h1, o1, bus_space_read_2(t, h2, o2)); \
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while (0)
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#define bus_space_copy_multi_4(t, h1, h2, o1, o2, c) \
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do { \
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register int __i ; \
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for (__i = 0; i < (c); i++) \
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bus_space_write_4(t, h1, o1, bus_space_read_4(t, h2, o2)); \
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} while (0)
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/*
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* Bus-space barriers.
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* Since DECstation DMA is non-cache-coherent, we have to handle
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* consistency in software anyway (e.g., via bus -DMA, or by ensuring
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* that DMA buffers are referenced via uncached address space.
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* For now, simply do CPU writebuffer flushes and export the flags
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* to MI code.
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*/
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#define bus_space_barrier(t, h, o, l, f) \
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((void) wbflush();
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#define BUS_BARRIER_READ 0x01
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#define BUS_BARRIER_WRITE 0x02
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#endif /* _PMAX_BUS_H_ */
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