90ce56c287
device drivers for bus system with other endinesses than the CPU (using interfaces compatible to NetBSD): - bwap16() and bswap32(). These have optimized implementations on some architectures; for those that don't, there exist generic implementations. - macros to convert from a certain byte order to host byte order and vice versa, using a naming scheme like le16toh(), htole16(). These are implemented using the bswap functions. - stream bus space access functions, which do not perform a byte order conversion (while the normal access functions would if the bus endianess differs from the CPU endianess). htons(), htonl(), ntohs() and ntohl() are implemented using the new functions above for kernel usage. None of the above interfaces is currently exported to user land. Make use of the new functions in a few places where local implementations of the same functionality existed. Reviewed by: mike, bde Tested on alpha by: mike
579 lines
22 KiB
C
579 lines
22 KiB
C
/* $NetBSD: bus.h,v 1.12 1997/10/01 08:25:15 fvdl Exp $ */
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/*-
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* Copyright (c) 1996, 1997 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
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* NASA Ames Research Center.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1996 Charles M. Hannum. All rights reserved.
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* Copyright (c) 1996 Christopher G. Demetriou. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Christopher G. Demetriou
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* for the NetBSD Project.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/* $FreeBSD$ */
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#ifndef _ALPHA_BUS_H_
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#define _ALPHA_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_int64_t bus_addr_t;
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typedef u_int64_t bus_size_t;
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typedef struct alpha_busspace *bus_space_tag_t;
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typedef u_int32_t bus_space_handle_t;
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#define BUS_SPACE_MAXSIZE_24BIT 0xFFFFFF
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#define BUS_SPACE_MAXSIZE_32BIT 0xFFFFFFFF
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#define BUS_SPACE_MAXSIZE (64 * 1024) /* Maximum supported size */
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#define BUS_SPACE_MAXADDR_24BIT 0xFFFFFF
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#define BUS_SPACE_MAXADDR_32BIT 0xFFFFFFFF
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/* The largest address space known so far is 40 bits */
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#define BUS_SPACE_MAXADDR 0xFFFFFFFFFUL
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#define BUS_SPACE_UNRESTRICTED (~0UL)
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struct alpha_busspace;
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struct alpha_busspace_ops {
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u_int8_t (*abo_read_1)(struct alpha_busspace *space, size_t offset);
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u_int16_t (*abo_read_2)(struct alpha_busspace *space, size_t offset);
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u_int32_t (*abo_read_4)(struct alpha_busspace *space, size_t offset);
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void (*abo_read_multi_1)(struct alpha_busspace *space,
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size_t offset,
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u_int8_t *addr, size_t count);
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void (*abo_read_multi_2)(struct alpha_busspace *space,
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size_t offset,
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u_int16_t *addr, size_t count);
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void (*abo_read_multi_4)(struct alpha_busspace *space,
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size_t offset,
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u_int32_t *addr, size_t count);
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void (*abo_read_region_1)(struct alpha_busspace *space,
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size_t offset,
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u_int8_t *addr, size_t count);
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void (*abo_read_region_2)(struct alpha_busspace *space,
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size_t offset,
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u_int16_t *addr, size_t count);
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void (*abo_read_region_4)(struct alpha_busspace *space,
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size_t offset,
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u_int32_t *addr, size_t count);
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void (*abo_write_1)(struct alpha_busspace *space, size_t offset,
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u_int8_t value);
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void (*abo_write_2)(struct alpha_busspace *space, size_t offset,
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u_int16_t value);
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void (*abo_write_4)(struct alpha_busspace *space, size_t offset,
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u_int32_t value);
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void (*abo_write_multi_1)(struct alpha_busspace *space,
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size_t offset,
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const u_int8_t *addr, size_t count);
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void (*abo_write_multi_2)(struct alpha_busspace *space,
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size_t offset,
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const u_int16_t *addr, size_t count);
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void (*abo_write_multi_4)(struct alpha_busspace *space,
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size_t offset,
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const u_int32_t *addr, size_t count);
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void (*abo_write_region_1)(struct alpha_busspace *space,
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size_t offset,
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const u_int8_t *addr, size_t count);
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void (*abo_write_region_2)(struct alpha_busspace *space,
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size_t offset,
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const u_int16_t *addr, size_t count);
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void (*abo_write_region_4)(struct alpha_busspace *space,
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size_t offset,
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const u_int32_t *addr, size_t count);
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void (*abo_set_multi_1)(struct alpha_busspace *space, size_t offset,
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u_int8_t value, size_t count);
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void (*abo_set_multi_2)(struct alpha_busspace *space, size_t offset,
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u_int16_t value, size_t count);
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void (*abo_set_multi_4)(struct alpha_busspace *space, size_t offset,
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u_int32_t value, size_t count);
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void (*abo_set_region_1)(struct alpha_busspace *space,
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size_t offset,
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u_int8_t value, size_t count);
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void (*abo_set_region_2)(struct alpha_busspace *space,
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size_t offset,
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u_int16_t value, size_t count);
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void (*abo_set_region_4)(struct alpha_busspace *space,
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size_t offset,
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u_int32_t value, size_t count);
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void (*abo_copy_region_1)(struct alpha_busspace *space,
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size_t offset1, size_t offset2,
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size_t count);
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void (*abo_copy_region_2)(struct alpha_busspace *space,
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size_t offset1, size_t offset2,
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size_t count);
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void (*abo_copy_region_4)(struct alpha_busspace *space,
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size_t offset1, size_t offset2,
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size_t count);
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void (*abo_barrier)(struct alpha_busspace *space, size_t offset,
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size_t len, int flags);
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};
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struct alpha_busspace {
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struct alpha_busspace_ops *ab_ops;
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};
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/* Back-compat functions for old ISA drivers */
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extern struct alpha_busspace *busspace_isa_io;
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extern struct alpha_busspace *busspace_isa_mem;
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#define inb(o) bus_space_read_1(busspace_isa_io, o, 0)
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#define inw(o) bus_space_read_2(busspace_isa_io, o, 0)
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#define inl(o) bus_space_read_4(busspace_isa_io, o, 0)
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#define outb(o, v) bus_space_write_1(busspace_isa_io, o, 0, v)
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#define outw(o, v) bus_space_write_2(busspace_isa_io, o, 0, v)
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#define outl(o, v) bus_space_write_4(busspace_isa_io, o, 0, v)
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#define readb(o) bus_space_read_1(busspace_isa_mem, o, 0)
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#define readw(o) bus_space_read_2(busspace_isa_mem, o, 0)
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#define readl(o) bus_space_read_4(busspace_isa_mem, o, 0)
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#define writeb(o, v) bus_space_write_1(busspace_isa_mem, o, 0, v)
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#define writew(o, v) bus_space_write_2(busspace_isa_mem, o, 0, v)
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#define writel(o, v) bus_space_write_4(busspace_isa_mem, o, 0, v)
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#define insb(o, a, c) bus_space_read_multi_1(busspace_isa_io, o, 0, \
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(void*)a, c)
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#define insw(o, a, c) bus_space_read_multi_2(busspace_isa_io, o, 0, \
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(void*)a, c)
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#define insl(o, a, c) bus_space_read_multi_4(busspace_isa_io, o, 0, \
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(void*)a, c)
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#define outsb(o, a, c) bus_space_write_multi_1(busspace_isa_io, o, 0, \
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(void*)a, c)
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#define outsw(o, a, c) bus_space_write_multi_2(busspace_isa_io, o, 0, \
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(void*)a, c)
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#define outsl(o, a, c) bus_space_write_multi_4(busspace_isa_io, o, 0, \
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(void*)a, c)
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#define memcpy_fromio(d, s, c) \
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bus_space_read_region_1(busspace_isa_mem, s, 0, d, c)
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#define memcpy_toio(d, s, c) \
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bus_space_write_region_1(busspace_isa_mem, d, 0, s, c)
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#define memcpy_io(d, s, c) \
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bus_space_copy_region_1(busspace_isa_mem, s, 0, d, 0, c)
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#define memset_io(d, v, c) \
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bus_space_set_region_1(busspace_isa_mem, d, 0, v, c)
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#define memsetw_io(d, v, c) \
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bus_space_set_region_2(busspace_isa_mem, d, 0, v, c)
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static __inline void
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memsetw(void *d, int val, size_t size)
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{
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u_int16_t *sp = d;
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while (size--)
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*sp++ = val;
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}
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void busspace_generic_read_multi_1(struct alpha_busspace *space,
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size_t offset,
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u_int8_t *addr, size_t count);
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void busspace_generic_read_multi_2(struct alpha_busspace *space,
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size_t offset,
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u_int16_t *addr, size_t count);
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void busspace_generic_read_multi_4(struct alpha_busspace *space,
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size_t offset,
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u_int32_t *addr, size_t count);
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void busspace_generic_read_region_1(struct alpha_busspace *space,
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size_t offset,
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u_int8_t *addr, size_t count);
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void busspace_generic_read_region_2(struct alpha_busspace *space,
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size_t offset,
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u_int16_t *addr, size_t count);
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void busspace_generic_read_region_4(struct alpha_busspace *space,
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size_t offset,
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u_int32_t *addr, size_t count);
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void busspace_generic_write_multi_1(struct alpha_busspace *space,
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size_t offset,
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const u_int8_t *addr, size_t count);
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void busspace_generic_write_multi_2(struct alpha_busspace *space,
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size_t offset,
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const u_int16_t *addr, size_t count);
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void busspace_generic_write_multi_4(struct alpha_busspace *space,
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size_t offset,
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const u_int32_t *addr, size_t count);
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void busspace_generic_write_region_1(struct alpha_busspace *space,
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size_t offset,
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const u_int8_t *addr, size_t count);
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void busspace_generic_write_region_2(struct alpha_busspace *space,
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size_t offset,
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const u_int16_t *addr, size_t count);
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void busspace_generic_write_region_4(struct alpha_busspace *space,
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size_t offset,
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const u_int32_t *addr, size_t count);
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void busspace_generic_set_multi_1(struct alpha_busspace *space,
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size_t offset,
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u_int8_t value, size_t count);
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void busspace_generic_set_multi_2(struct alpha_busspace *space,
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size_t offset,
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u_int16_t value, size_t count);
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void busspace_generic_set_multi_4(struct alpha_busspace *space,
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size_t offset,
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u_int32_t value, size_t count);
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void busspace_generic_set_region_1(struct alpha_busspace *space,
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size_t offset,
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u_int8_t value, size_t count);
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void busspace_generic_set_region_2(struct alpha_busspace *space,
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size_t offset,
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u_int16_t value, size_t count);
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void busspace_generic_set_region_4(struct alpha_busspace *space,
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size_t offset,
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u_int32_t value, size_t count);
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void busspace_generic_copy_region_1(struct alpha_busspace *space,
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size_t offset1,
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size_t offset2,
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size_t count);
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void busspace_generic_copy_region_2(struct alpha_busspace *space,
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size_t offset1,
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size_t offset2,
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size_t count);
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void busspace_generic_copy_region_4(struct alpha_busspace *space,
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size_t offset1,
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size_t offset2,
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size_t count);
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void busspace_generic_barrier(struct alpha_busspace *space,
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size_t offset, size_t len,
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int flags);
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#define BUS_SPACE_BARRIER_READ 0x01 /* force read barrier */
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#define BUS_SPACE_BARRIER_WRITE 0x02 /* force write barrier */
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#define bus_space_read_1(t, h, o) \
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(t)->ab_ops->abo_read_1(t, (h)+(o))
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#define bus_space_read_2(t, h, o) \
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(t)->ab_ops->abo_read_2(t, (h)+(o))
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#define bus_space_read_4(t, h, o) \
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(t)->ab_ops->abo_read_4(t, (h)+(o))
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#define bus_space_read_multi_1(t, h, o, a, c) \
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(t)->ab_ops->abo_read_multi_1(t, (h)+(o), a, c)
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#define bus_space_read_multi_2(t, h, o, a, c) \
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(t)->ab_ops->abo_read_multi_2(t, (h)+(o), a, c)
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#define bus_space_read_multi_4(t, h, o, a, c) \
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(t)->ab_ops->abo_read_multi_4(t, (h)+(o), a, c)
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#define bus_space_read_region_1(t, h, o, a, c) \
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(t)->ab_ops->abo_read_region_1(t, (h)+(o), a, c)
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#define bus_space_read_region_2(t, h, o, a, c) \
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(t)->ab_ops->abo_read_region_2(t, (h)+(o), a, c)
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#define bus_space_read_region_4(t, h, o, a, c) \
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(t)->ab_ops->abo_read_region_4(t, (h)+(o), a, c)
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#define bus_space_write_1(t, h, o, v) \
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(t)->ab_ops->abo_write_1(t, (h)+(o), v)
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#define bus_space_write_2(t, h, o, v) \
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(t)->ab_ops->abo_write_2(t, (h)+(o), v)
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#define bus_space_write_4(t, h, o, v) \
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(t)->ab_ops->abo_write_4(t, (h)+(o), v)
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#define bus_space_write_multi_1(t, h, o, a, c) \
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(t)->ab_ops->abo_write_multi_1(t, (h)+(o), a, c)
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#define bus_space_write_multi_2(t, h, o, a, c) \
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(t)->ab_ops->abo_write_multi_2(t, (h)+(o), a, c)
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#define bus_space_write_multi_4(t, h, o, a, c) \
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(t)->ab_ops->abo_write_multi_4(t, (h)+(o), a, c)
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#define bus_space_write_region_1(t, h, o, a, c) \
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(t)->ab_ops->abo_write_region_1(t, (h)+(o), a, c)
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#define bus_space_write_region_2(t, h, o, a, c) \
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(t)->ab_ops->abo_write_region_2(t, (h)+(o), a, c)
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#define bus_space_write_region_4(t, h, o, a, c) \
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(t)->ab_ops->abo_write_region_4(t, (h)+(o), a, c)
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#define bus_space_set_multi_1(t, h, o, v, c) \
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(t)->ab_ops->abo_set_multi_1(t, (h)+(o), v, c)
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#define bus_space_set_multi_2(t, h, o, v, c) \
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(t)->ab_ops->abo_set_multi_2(t, (h)+(o), v, c)
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#define bus_space_set_multi_4(t, h, o, v, c) \
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(t)->ab_ops->abo_set_multi_4(t, (h)+(o), v, c)
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#define bus_space_set_region_1(t, h, o, v, c) \
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(t)->ab_ops->abo_set_region_1(t, (h)+(o), v, c)
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#define bus_space_set_region_2(t, h, o, v, c) \
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(t)->ab_ops->abo_set_region_2(t, (h)+(o), v, c)
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#define bus_space_set_region_4(t, h, o, v, c) \
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(t)->ab_ops->abo_set_region_4(t, (h)+(o), v, c)
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#define bus_space_copy_region_1(t, h1, o1, h2, o2, c) \
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(t)->ab_ops->abo_copy_region_1(t, (h1)+(o1), (h2)+(o2), c)
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#define bus_space_copy_region_2(t, h1, o1, h2, o2, c) \
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(t)->ab_ops->abo_copy_region_2(t, (h1)+(o1), (h2)+(o2), c)
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#define bus_space_copy_region_4(t, h1, o1, h2, o2, c) \
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(t)->ab_ops->abo_copy_region_4(t, (h1)+(o1), (h2)+(o2), c)
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#define bus_space_barrier(t, h, o, l, f) \
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(t)->ab_ops->abo_barrier(t, (h)+(o), l, f)
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/*
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* Stream accesses are the same as normal accesses on alpha; there are no
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* supported bus systems with an endianess different from the host one.
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*/
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#define bus_space_read_stream_1(t, h, o) bus_space_read_1((t), (h), (o))
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#define bus_space_read_stream_2(t, h, o) bus_space_read_2((t), (h), (o))
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#define bus_space_read_stream_4(t, h, o) bus_space_read_4((t), (h), (o))
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#define bus_space_read_multi_stream_1(t, h, o, a, c) \
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bus_space_read_multi_1((t), (h), (o), (a), (c))
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#define bus_space_read_multi_stream_2(t, h, o, a, c) \
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bus_space_read_multi_2((t), (h), (o), (a), (c))
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#define bus_space_read_multi_stream_4(t, h, o, a, c) \
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bus_space_read_multi_4((t), (h), (o), (a), (c))
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#define bus_space_write_stream_1(t, h, o, v) \
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bus_space_write_1((t), (h), (o), (v))
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#define bus_space_write_stream_2(t, h, o, v) \
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bus_space_write_2((t), (h), (o), (v))
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#define bus_space_write_stream_4(t, h, o, v) \
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bus_space_write_4((t), (h), (o), (v))
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#define bus_space_write_multi_stream_1(t, h, o, a, c) \
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bus_space_write_multi_1((t), (h), (o), (a), (c))
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#define bus_space_write_multi_stream_2(t, h, o, a, c) \
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bus_space_write_multi_2((t), (h), (o), (a), (c))
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#define bus_space_write_multi_stream_4(t, h, o, a, c) \
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bus_space_write_multi_4((t), (h), (o), (a), (c))
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#define bus_space_set_multi_stream_1(t, h, o, v, c) \
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bus_space_set_multi_1((t), (h), (o), (v), (c))
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#define bus_space_set_multi_stream_2(t, h, o, v, c) \
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bus_space_set_multi_2((t), (h), (o), (v), (c))
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#define bus_space_set_multi_stream_4(t, h, o, v, c) \
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bus_space_set_multi_4((t), (h), (o), (v), (c))
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#define bus_space_read_region_stream_1(t, h, o, a, c) \
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bus_space_read_region_1((t), (h), (o), (a), (c))
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#define bus_space_read_region_stream_2(t, h, o, a, c) \
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bus_space_read_region_2((t), (h), (o), (a), (c))
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#define bus_space_read_region_stream_4(t, h, o, a, c) \
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bus_space_read_region_4((t), (h), (o), (a), (c))
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#define bus_space_write_region_stream_1(t, h, o, a, c) \
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bus_space_write_region_1((t), (h), (o), (a), (c))
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#define bus_space_write_region_stream_2(t, h, o, a, c) \
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bus_space_write_region_2((t), (h), (o), (a), (c))
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#define bus_space_write_region_stream_4(t, h, o, a, c) \
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bus_space_write_region_4((t), (h), (o), (a), (c))
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#define bus_space_set_region_stream_1(t, h, o, v, c) \
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bus_space_set_region_1((t), (h), (o), (v), (c))
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#define bus_space_set_region_stream_2(t, h, o, v, c) \
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bus_space_set_region_2((t), (h), (o), (v), (c))
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#define bus_space_set_region_stream_4(t, h, o, v, c) \
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bus_space_set_region_4((t), (h), (o), (v), (c))
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#define bus_space_copy_region_stream_1(t, h1, o1, h2, o2, c) \
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bus_space_copy_region_1((t), (h1), (o1), (h2), (o2), (c))
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#define bus_space_copy_region_stream_2(t, h1, o1, h2, o2, c) \
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bus_space_copy_region_2((t), (h1), (o1), (h2), (o2), (c))
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#define bus_space_copy_region_stream_4(t, h1, o1, h2, o2, c) \
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bus_space_copy_region_4((t), (h1), (o1), (h2), (o2), (c))
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/*
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* Flags used in various bus DMA methods.
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*/
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#define BUS_DMA_WAITOK 0x00 /* safe to sleep (pseudo-flag) */
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#define BUS_DMA_NOWAIT 0x01 /* not safe to sleep */
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#define BUS_DMA_ALLOCNOW 0x02 /* perform resource allocation now */
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#define BUS_DMAMEM_NOSYNC 0x04 /* map memory to not require sync */
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#define BUS_DMA_ISA 0x10 /* map memory for ISA dma */
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#define BUS_DMA_BUS2 0x20 /* placeholders for bus functions... */
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#define BUS_DMA_BUS3 0x40
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#define BUS_DMA_BUS4 0x80
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/* Forwards needed by prototypes below. */
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struct mbuf;
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struct uio;
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/*
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* bus_dmasync_op_t
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*
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* Operations performed by bus_dmamap_sync().
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*/
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typedef enum {
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BUS_DMASYNC_PREREAD,
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BUS_DMASYNC_POSTREAD,
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BUS_DMASYNC_PREWRITE,
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BUS_DMASYNC_POSTWRITE
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} bus_dmasync_op_t;
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/*
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* bus_dma_tag_t
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*
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* A machine-dependent opaque type describing the characteristics
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* of how to perform DMA mappings. This structure encapsultes
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* information concerning address and alignment restrictions, number
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* of S/G segments, amount of data per S/G segment, etc.
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*/
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typedef struct bus_dma_tag *bus_dma_tag_t;
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/*
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* bus_dmamap_t
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*
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* DMA mapping instance information.
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*/
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typedef struct bus_dmamap *bus_dmamap_t;
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/*
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* bus_dma_segment_t
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*
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* Describes a single contiguous DMA transaction. Values
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* are suitable for programming into DMA registers.
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*/
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typedef struct bus_dma_segment {
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bus_addr_t ds_addr; /* DMA address */
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bus_size_t ds_len; /* length of transfer */
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} bus_dma_segment_t;
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/*
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* A function that returns 1 if the address cannot be accessed by
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* a device and 0 if it can be.
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*/
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typedef int bus_dma_filter_t(void *, bus_addr_t);
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/*
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* Allocate a device specific dma_tag encapsulating the constraints of
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* the parent tag in addition to other restrictions specified:
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*
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* alignment: alignment for segments.
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* boundary: Boundary that segments cannot cross.
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* lowaddr: Low restricted address that cannot appear in a mapping.
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* highaddr: High restricted address that cannot appear in a mapping.
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* filtfunc: An optional function to further test if an address
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* within the range of lowaddr and highaddr cannot appear
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* in a mapping.
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* filtfuncarg: An argument that will be passed to filtfunc in addition
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* to the address to test.
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* maxsize: Maximum mapping size supported by this tag.
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* nsegments: Number of discontinuities allowed in maps.
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* maxsegsz: Maximum size of a segment in the map.
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* flags: Bus DMA flags.
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* dmat: A pointer to set to a valid dma tag should the return
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* value of this function indicate success.
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*/
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/* XXX Should probably allow specification of alignment */
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int bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignemnt,
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bus_size_t boundary, bus_addr_t lowaddr,
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bus_addr_t highaddr, bus_dma_filter_t *filtfunc,
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void *filtfuncarg, bus_size_t maxsize, int nsegments,
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bus_size_t maxsegsz, int flags, bus_dma_tag_t *dmat);
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int bus_dma_tag_destroy(bus_dma_tag_t dmat);
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/*
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* Allocate a handle for mapping from kva/uva/physical
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* address space into bus device space.
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*/
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int bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp);
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/*
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* Destroy a handle for mapping from kva/uva/physical
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* address space into bus device space.
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*/
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int bus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map);
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/*
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* Allocate a piece of memory that can be efficiently mapped into
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* bus device space based on the constraints lited in the dma tag.
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* A dmamap to for use with dmamap_load is also allocated.
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*/
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int bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags,
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bus_dmamap_t *mapp);
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/*
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* Free a piece of memory and it's allociated dmamap, that was allocated
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* via bus_dmamem_alloc.
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*/
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void bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map);
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/*
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* A function that processes a successfully loaded dma map or an error
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* from a delayed load map.
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*/
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typedef void bus_dmamap_callback_t(void *, bus_dma_segment_t *, int, int);
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/*
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* Map the buffer buf into bus space using the dmamap map.
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*/
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int bus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
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bus_size_t buflen, bus_dmamap_callback_t *callback,
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void *callback_arg, int flags);
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/*
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* Perform a syncronization operation on the given map.
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*/
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void _bus_dmamap_sync(bus_dma_tag_t, bus_dmamap_t, bus_dmasync_op_t);
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#define bus_dmamap_sync(dmat, dmamap, op) \
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if ((dmamap) != NULL) \
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_bus_dmamap_sync(dmat, dmamap, op)
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/*
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* Release the mapping held by map.
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*/
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void _bus_dmamap_unload(bus_dma_tag_t dmat, bus_dmamap_t map);
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#define bus_dmamap_unload(dmat, dmamap) \
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if ((dmamap) != NULL) \
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_bus_dmamap_unload(dmat, dmamap)
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#endif /* _ALPHA_BUS_H_ */
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