FreeBSD-5.3/sys/alpha/include/bus.h
/* $NetBSD: bus.h,v 1.12 1997/10/01 08:25:15 fvdl Exp $ */
/*-
* Copyright (c) 1996, 1997 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
* NASA Ames Research Center.
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/*
* Copyright (c) 1996 Charles M. Hannum. All rights reserved.
* Copyright (c) 1996 Christopher G. Demetriou. 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Christopher G. Demetriou
* for the NetBSD Project.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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: src/sys/alpha/include/bus.h,v 1.25 2003/11/07 23:29:42 scottl Exp $ */
#ifndef _ALPHA_BUS_H_
#define _ALPHA_BUS_H_
/*
* Bus address and size types
*/
typedef u_int64_t bus_addr_t;
typedef u_int64_t bus_size_t;
typedef struct alpha_busspace *bus_space_tag_t;
typedef u_int32_t bus_space_handle_t;
#define BUS_SPACE_MAXSIZE_24BIT 0xFFFFFF
#define BUS_SPACE_MAXSIZE_32BIT 0xFFFFFFFF
#define BUS_SPACE_MAXSIZE 0xFFFFFFFFFFFFFFFF
#define BUS_SPACE_MAXADDR_24BIT 0xFFFFFF
#define BUS_SPACE_MAXADDR_32BIT 0xFFFFFFFF
/* The largest address space known so far is 40 bits */
#define BUS_SPACE_MAXADDR 0xFFFFFFFFFUL
#define BUS_SPACE_UNRESTRICTED (~0UL)
/*
* Map a region of device bus space into CPU virtual address space.
*/
static __inline int bus_space_map(bus_space_tag_t t, bus_addr_t addr,
bus_size_t size, int flags,
bus_space_handle_t *bshp);
static __inline int
bus_space_map(bus_space_tag_t t __unused, bus_addr_t addr,
bus_size_t size __unused, int flags __unused,
bus_space_handle_t *bshp)
{
*bshp = addr;
return (0);
}
/*
* Unmap a region of device bus space.
*/
static __inline void bus_space_unmap(bus_space_tag_t t, bus_space_handle_t bsh,
bus_size_t size);
static __inline void
bus_space_unmap(bus_space_tag_t t __unused, bus_space_handle_t bsh __unused,
bus_size_t size __unused)
{
}
/*
* Get a new handle for a subregion of an already-mapped area of bus space.
*/
static __inline int bus_space_subregion(bus_space_tag_t t,
bus_space_handle_t bsh,
bus_size_t offset, bus_size_t size,
bus_space_handle_t *nbshp);
static __inline int
bus_space_subregion(bus_space_tag_t t __unused, bus_space_handle_t bsh,
bus_size_t offset, bus_size_t size __unused,
bus_space_handle_t *nbshp)
{
*nbshp = bsh + offset;
return (0);
}
struct alpha_busspace;
struct alpha_busspace_ops {
u_int8_t (*abo_read_1)(struct alpha_busspace *space, size_t offset);
u_int16_t (*abo_read_2)(struct alpha_busspace *space, size_t offset);
u_int32_t (*abo_read_4)(struct alpha_busspace *space, size_t offset);
void (*abo_read_multi_1)(struct alpha_busspace *space,
size_t offset,
u_int8_t *addr, size_t count);
void (*abo_read_multi_2)(struct alpha_busspace *space,
size_t offset,
u_int16_t *addr, size_t count);
void (*abo_read_multi_4)(struct alpha_busspace *space,
size_t offset,
u_int32_t *addr, size_t count);
void (*abo_read_region_1)(struct alpha_busspace *space,
size_t offset,
u_int8_t *addr, size_t count);
void (*abo_read_region_2)(struct alpha_busspace *space,
size_t offset,
u_int16_t *addr, size_t count);
void (*abo_read_region_4)(struct alpha_busspace *space,
size_t offset,
u_int32_t *addr, size_t count);
void (*abo_write_1)(struct alpha_busspace *space, size_t offset,
u_int8_t value);
void (*abo_write_2)(struct alpha_busspace *space, size_t offset,
u_int16_t value);
void (*abo_write_4)(struct alpha_busspace *space, size_t offset,
u_int32_t value);
void (*abo_write_multi_1)(struct alpha_busspace *space,
size_t offset,
const u_int8_t *addr, size_t count);
void (*abo_write_multi_2)(struct alpha_busspace *space,
size_t offset,
const u_int16_t *addr, size_t count);
void (*abo_write_multi_4)(struct alpha_busspace *space,
size_t offset,
const u_int32_t *addr, size_t count);
void (*abo_write_region_1)(struct alpha_busspace *space,
size_t offset,
const u_int8_t *addr, size_t count);
void (*abo_write_region_2)(struct alpha_busspace *space,
size_t offset,
const u_int16_t *addr, size_t count);
void (*abo_write_region_4)(struct alpha_busspace *space,
size_t offset,
const u_int32_t *addr, size_t count);
void (*abo_set_multi_1)(struct alpha_busspace *space, size_t offset,
u_int8_t value, size_t count);
void (*abo_set_multi_2)(struct alpha_busspace *space, size_t offset,
u_int16_t value, size_t count);
void (*abo_set_multi_4)(struct alpha_busspace *space, size_t offset,
u_int32_t value, size_t count);
void (*abo_set_region_1)(struct alpha_busspace *space,
size_t offset,
u_int8_t value, size_t count);
void (*abo_set_region_2)(struct alpha_busspace *space,
size_t offset,
u_int16_t value, size_t count);
void (*abo_set_region_4)(struct alpha_busspace *space,
size_t offset,
u_int32_t value, size_t count);
void (*abo_copy_region_1)(struct alpha_busspace *space,
size_t offset1, size_t offset2,
size_t count);
void (*abo_copy_region_2)(struct alpha_busspace *space,
size_t offset1, size_t offset2,
size_t count);
void (*abo_copy_region_4)(struct alpha_busspace *space,
size_t offset1, size_t offset2,
size_t count);
void (*abo_barrier)(struct alpha_busspace *space, size_t offset,
size_t len, int flags);
};
struct alpha_busspace {
struct alpha_busspace_ops *ab_ops;
};
/* Back-compat functions for old ISA drivers */
extern struct alpha_busspace *busspace_isa_io;
extern struct alpha_busspace *busspace_isa_mem;
#define inb(o) bus_space_read_1(busspace_isa_io, o, 0)
#define inw(o) bus_space_read_2(busspace_isa_io, o, 0)
#define inl(o) bus_space_read_4(busspace_isa_io, o, 0)
#define outb(o, v) bus_space_write_1(busspace_isa_io, o, 0, v)
#define outw(o, v) bus_space_write_2(busspace_isa_io, o, 0, v)
#define outl(o, v) bus_space_write_4(busspace_isa_io, o, 0, v)
#define readb(o) bus_space_read_1(busspace_isa_mem, o, 0)
#define readw(o) bus_space_read_2(busspace_isa_mem, o, 0)
#define readl(o) bus_space_read_4(busspace_isa_mem, o, 0)
#define writeb(o, v) bus_space_write_1(busspace_isa_mem, o, 0, v)
#define writew(o, v) bus_space_write_2(busspace_isa_mem, o, 0, v)
#define writel(o, v) bus_space_write_4(busspace_isa_mem, o, 0, v)
#define insb(o, a, c) bus_space_read_multi_1(busspace_isa_io, o, 0, \
(void*)(a), c)
#define insw(o, a, c) bus_space_read_multi_2(busspace_isa_io, o, 0, \
(void*)(a), c)
#define insl(o, a, c) bus_space_read_multi_4(busspace_isa_io, o, 0, \
(void*)(a), c)
#define outsb(o, a, c) bus_space_write_multi_1(busspace_isa_io, o, 0, \
(void*)(a), c)
#define outsw(o, a, c) bus_space_write_multi_2(busspace_isa_io, o, 0, \
(void*)(a), c)
#define outsl(o, a, c) bus_space_write_multi_4(busspace_isa_io, o, 0, \
(void*)(a), c)
#define memcpy_fromio(d, s, c) \
bus_space_read_region_1(busspace_isa_mem, (uintptr_t)(s), 0, d, c)
#define memcpy_toio(d, s, c) \
bus_space_write_region_1(busspace_isa_mem, (uintptr_t)(d), 0, s, c)
#define memcpy_io(d, s, c) \
bus_space_copy_region_1(busspace_isa_mem, (uintptr_t)(s), 0, d, 0, c)
#define memset_io(d, v, c) \
bus_space_set_region_1(busspace_isa_mem, (uintptr_t)(d), 0, v, c)
#define memsetw_io(d, v, c) \
bus_space_set_region_2(busspace_isa_mem, (uintptr_t)(d), 0, v, c)
static __inline void
memsetw(void *d, int val, size_t size)
{
u_int16_t *sp = d;
while (size--)
*sp++ = val;
}
void busspace_generic_read_multi_1(struct alpha_busspace *space,
size_t offset,
u_int8_t *addr, size_t count);
void busspace_generic_read_multi_2(struct alpha_busspace *space,
size_t offset,
u_int16_t *addr, size_t count);
void busspace_generic_read_multi_4(struct alpha_busspace *space,
size_t offset,
u_int32_t *addr, size_t count);
void busspace_generic_read_region_1(struct alpha_busspace *space,
size_t offset,
u_int8_t *addr, size_t count);
void busspace_generic_read_region_2(struct alpha_busspace *space,
size_t offset,
u_int16_t *addr, size_t count);
void busspace_generic_read_region_4(struct alpha_busspace *space,
size_t offset,
u_int32_t *addr, size_t count);
void busspace_generic_write_multi_1(struct alpha_busspace *space,
size_t offset,
const u_int8_t *addr, size_t count);
void busspace_generic_write_multi_2(struct alpha_busspace *space,
size_t offset,
const u_int16_t *addr, size_t count);
void busspace_generic_write_multi_4(struct alpha_busspace *space,
size_t offset,
const u_int32_t *addr, size_t count);
void busspace_generic_write_region_1(struct alpha_busspace *space,
size_t offset,
const u_int8_t *addr, size_t count);
void busspace_generic_write_region_2(struct alpha_busspace *space,
size_t offset,
const u_int16_t *addr, size_t count);
void busspace_generic_write_region_4(struct alpha_busspace *space,
size_t offset,
const u_int32_t *addr, size_t count);
void busspace_generic_set_multi_1(struct alpha_busspace *space,
size_t offset,
u_int8_t value, size_t count);
void busspace_generic_set_multi_2(struct alpha_busspace *space,
size_t offset,
u_int16_t value, size_t count);
void busspace_generic_set_multi_4(struct alpha_busspace *space,
size_t offset,
u_int32_t value, size_t count);
void busspace_generic_set_region_1(struct alpha_busspace *space,
size_t offset,
u_int8_t value, size_t count);
void busspace_generic_set_region_2(struct alpha_busspace *space,
size_t offset,
u_int16_t value, size_t count);
void busspace_generic_set_region_4(struct alpha_busspace *space,
size_t offset,
u_int32_t value, size_t count);
void busspace_generic_copy_region_1(struct alpha_busspace *space,
size_t offset1,
size_t offset2,
size_t count);
void busspace_generic_copy_region_2(struct alpha_busspace *space,
size_t offset1,
size_t offset2,
size_t count);
void busspace_generic_copy_region_4(struct alpha_busspace *space,
size_t offset1,
size_t offset2,
size_t count);
void busspace_generic_barrier(struct alpha_busspace *space,
size_t offset, size_t len,
int flags);
#define BUS_SPACE_BARRIER_READ 0x01 /* force read barrier */
#define BUS_SPACE_BARRIER_WRITE 0x02 /* force write barrier */
#define bus_space_read_1(t, h, o) \
(t)->ab_ops->abo_read_1(t, (h)+(o))
#define bus_space_read_2(t, h, o) \
(t)->ab_ops->abo_read_2(t, (h)+(o))
#define bus_space_read_4(t, h, o) \
(t)->ab_ops->abo_read_4(t, (h)+(o))
#define bus_space_read_multi_1(t, h, o, a, c) \
(t)->ab_ops->abo_read_multi_1(t, (h)+(o), a, c)
#define bus_space_read_multi_2(t, h, o, a, c) \
(t)->ab_ops->abo_read_multi_2(t, (h)+(o), a, c)
#define bus_space_read_multi_4(t, h, o, a, c) \
(t)->ab_ops->abo_read_multi_4(t, (h)+(o), a, c)
#define bus_space_read_region_1(t, h, o, a, c) \
(t)->ab_ops->abo_read_region_1(t, (h)+(o), a, c)
#define bus_space_read_region_2(t, h, o, a, c) \
(t)->ab_ops->abo_read_region_2(t, (h)+(o), a, c)
#define bus_space_read_region_4(t, h, o, a, c) \
(t)->ab_ops->abo_read_region_4(t, (h)+(o), a, c)
#define bus_space_write_1(t, h, o, v) \
(t)->ab_ops->abo_write_1(t, (h)+(o), v)
#define bus_space_write_2(t, h, o, v) \
(t)->ab_ops->abo_write_2(t, (h)+(o), v)
#define bus_space_write_4(t, h, o, v) \
(t)->ab_ops->abo_write_4(t, (h)+(o), v)
#define bus_space_write_multi_1(t, h, o, a, c) \
(t)->ab_ops->abo_write_multi_1(t, (h)+(o), a, c)
#define bus_space_write_multi_2(t, h, o, a, c) \
(t)->ab_ops->abo_write_multi_2(t, (h)+(o), a, c)
#define bus_space_write_multi_4(t, h, o, a, c) \
(t)->ab_ops->abo_write_multi_4(t, (h)+(o), a, c)
#define bus_space_write_region_1(t, h, o, a, c) \
(t)->ab_ops->abo_write_region_1(t, (h)+(o), a, c)
#define bus_space_write_region_2(t, h, o, a, c) \
(t)->ab_ops->abo_write_region_2(t, (h)+(o), a, c)
#define bus_space_write_region_4(t, h, o, a, c) \
(t)->ab_ops->abo_write_region_4(t, (h)+(o), a, c)
#define bus_space_set_multi_1(t, h, o, v, c) \
(t)->ab_ops->abo_set_multi_1(t, (h)+(o), v, c)
#define bus_space_set_multi_2(t, h, o, v, c) \
(t)->ab_ops->abo_set_multi_2(t, (h)+(o), v, c)
#define bus_space_set_multi_4(t, h, o, v, c) \
(t)->ab_ops->abo_set_multi_4(t, (h)+(o), v, c)
#define bus_space_set_region_1(t, h, o, v, c) \
(t)->ab_ops->abo_set_region_1(t, (h)+(o), v, c)
#define bus_space_set_region_2(t, h, o, v, c) \
(t)->ab_ops->abo_set_region_2(t, (h)+(o), v, c)
#define bus_space_set_region_4(t, h, o, v, c) \
(t)->ab_ops->abo_set_region_4(t, (h)+(o), v, c)
#define bus_space_copy_region_1(t, h1, o1, h2, o2, c) \
(t)->ab_ops->abo_copy_region_1(t, (h1)+(o1), (h2)+(o2), c)
#define bus_space_copy_region_2(t, h1, o1, h2, o2, c) \
(t)->ab_ops->abo_copy_region_2(t, (h1)+(o1), (h2)+(o2), c)
#define bus_space_copy_region_4(t, h1, o1, h2, o2, c) \
(t)->ab_ops->abo_copy_region_4(t, (h1)+(o1), (h2)+(o2), c)
#define bus_space_barrier(t, h, o, l, f) \
(t)->ab_ops->abo_barrier(t, (h)+(o), l, f)
/*
* Stream accesses are the same as normal accesses on alpha; there are no
* supported bus systems with an endianess different from the host one.
*/
#define bus_space_read_stream_1(t, h, o) bus_space_read_1((t), (h), (o))
#define bus_space_read_stream_2(t, h, o) bus_space_read_2((t), (h), (o))
#define bus_space_read_stream_4(t, h, o) bus_space_read_4((t), (h), (o))
#define bus_space_read_multi_stream_1(t, h, o, a, c) \
bus_space_read_multi_1((t), (h), (o), (a), (c))
#define bus_space_read_multi_stream_2(t, h, o, a, c) \
bus_space_read_multi_2((t), (h), (o), (a), (c))
#define bus_space_read_multi_stream_4(t, h, o, a, c) \
bus_space_read_multi_4((t), (h), (o), (a), (c))
#define bus_space_write_stream_1(t, h, o, v) \
bus_space_write_1((t), (h), (o), (v))
#define bus_space_write_stream_2(t, h, o, v) \
bus_space_write_2((t), (h), (o), (v))
#define bus_space_write_stream_4(t, h, o, v) \
bus_space_write_4((t), (h), (o), (v))
#define bus_space_write_multi_stream_1(t, h, o, a, c) \
bus_space_write_multi_1((t), (h), (o), (a), (c))
#define bus_space_write_multi_stream_2(t, h, o, a, c) \
bus_space_write_multi_2((t), (h), (o), (a), (c))
#define bus_space_write_multi_stream_4(t, h, o, a, c) \
bus_space_write_multi_4((t), (h), (o), (a), (c))
#define bus_space_set_multi_stream_1(t, h, o, v, c) \
bus_space_set_multi_1((t), (h), (o), (v), (c))
#define bus_space_set_multi_stream_2(t, h, o, v, c) \
bus_space_set_multi_2((t), (h), (o), (v), (c))
#define bus_space_set_multi_stream_4(t, h, o, v, c) \
bus_space_set_multi_4((t), (h), (o), (v), (c))
#define bus_space_read_region_stream_1(t, h, o, a, c) \
bus_space_read_region_1((t), (h), (o), (a), (c))
#define bus_space_read_region_stream_2(t, h, o, a, c) \
bus_space_read_region_2((t), (h), (o), (a), (c))
#define bus_space_read_region_stream_4(t, h, o, a, c) \
bus_space_read_region_4((t), (h), (o), (a), (c))
#define bus_space_write_region_stream_1(t, h, o, a, c) \
bus_space_write_region_1((t), (h), (o), (a), (c))
#define bus_space_write_region_stream_2(t, h, o, a, c) \
bus_space_write_region_2((t), (h), (o), (a), (c))
#define bus_space_write_region_stream_4(t, h, o, a, c) \
bus_space_write_region_4((t), (h), (o), (a), (c))
#define bus_space_set_region_stream_1(t, h, o, v, c) \
bus_space_set_region_1((t), (h), (o), (v), (c))
#define bus_space_set_region_stream_2(t, h, o, v, c) \
bus_space_set_region_2((t), (h), (o), (v), (c))
#define bus_space_set_region_stream_4(t, h, o, v, c) \
bus_space_set_region_4((t), (h), (o), (v), (c))
#define bus_space_copy_region_stream_1(t, h1, o1, h2, o2, c) \
bus_space_copy_region_1((t), (h1), (o1), (h2), (o2), (c))
#define bus_space_copy_region_stream_2(t, h1, o1, h2, o2, c) \
bus_space_copy_region_2((t), (h1), (o1), (h2), (o2), (c))
#define bus_space_copy_region_stream_4(t, h1, o1, h2, o2, c) \
bus_space_copy_region_4((t), (h1), (o1), (h2), (o2), (c))
/*
* Flags used in various bus DMA methods.
*/
#define BUS_DMA_WAITOK 0x00 /* safe to sleep (pseudo-flag) */
#define BUS_DMA_NOWAIT 0x01 /* not safe to sleep */
#define BUS_DMA_ALLOCNOW 0x02 /* perform resource allocation now */
#define BUS_DMA_COHERENT 0x04 /* hint: map memory in a coherent way */
#define BUS_DMA_ZERO 0x08 /* allocate zero'ed memory */
#define BUS_DMA_ISA 0x10 /* map memory for ISA dma */
#define BUS_DMA_BUS2 0x20 /* placeholders for bus functions... */
#define BUS_DMA_BUS3 0x40
#define BUS_DMA_BUS4 0x80
/* Forwards needed by prototypes below. */
struct mbuf;
struct uio;
/*
* Operations performed by bus_dmamap_sync().
*/
typedef int bus_dmasync_op_t;
#define BUS_DMASYNC_PREREAD 1
#define BUS_DMASYNC_POSTREAD 2
#define BUS_DMASYNC_PREWRITE 4
#define BUS_DMASYNC_POSTWRITE 8
/*
* bus_dma_tag_t
*
* A machine-dependent opaque type describing the characteristics
* of how to perform DMA mappings. This structure encapsultes
* information concerning address and alignment restrictions, number
* of S/G segments, amount of data per S/G segment, etc.
*/
typedef struct bus_dma_tag *bus_dma_tag_t;
/*
* bus_dmamap_t
*
* DMA mapping instance information.
*/
typedef struct bus_dmamap *bus_dmamap_t;
/*
* bus_dma_segment_t
*
* Describes a single contiguous DMA transaction. Values
* are suitable for programming into DMA registers.
*/
typedef struct bus_dma_segment {
bus_addr_t ds_addr; /* DMA address */
bus_size_t ds_len; /* length of transfer */
} bus_dma_segment_t;
/*
* A function that returns 1 if the address cannot be accessed by
* a device and 0 if it can be.
*/
typedef int bus_dma_filter_t(void *, bus_addr_t);
/*
* A function that performs driver-specific syncronization on behalf of
* busdma.
*/
typedef enum {
BUS_DMA_LOCK = 0x01,
BUS_DMA_UNLOCK = 0x02,
} bus_dma_lock_op_t;
typedef void bus_dma_lock_t(void *, bus_dma_lock_op_t);
/*
* Allocate a device specific dma_tag encapsulating the constraints of
* the parent tag in addition to other restrictions specified:
*
* alignment: alignment for segments.
* boundary: Boundary that segments cannot cross.
* lowaddr: Low restricted address that cannot appear in a mapping.
* highaddr: High restricted address that cannot appear in a mapping.
* filtfunc: An optional function to further test if an address
* within the range of lowaddr and highaddr cannot appear
* in a mapping.
* filtfuncarg: An argument that will be passed to filtfunc in addition
* to the address to test.
* maxsize: Maximum mapping size supported by this tag.
* nsegments: Number of discontinuities allowed in maps.
* maxsegsz: Maximum size of a segment in the map.
* flags: Bus DMA flags.
* lockfunc: An optional function to handle driver-defined lock
* operations.
* lockfuncarg: An argument that will be passed to lockfunc in addition
* to the lock operation.
* dmat: A pointer to set to a valid dma tag should the return
* value of this function indicate success.
*/
/* XXX Should probably allow specification of alignment */
int bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignemnt,
bus_size_t boundary, bus_addr_t lowaddr,
bus_addr_t highaddr, bus_dma_filter_t *filtfunc,
void *filtfuncarg, bus_size_t maxsize, int nsegments,
bus_size_t maxsegsz, int flags, bus_dma_lock_t *lockfunc,
void *lockfuncarg, bus_dma_tag_t *dmat);
int bus_dma_tag_destroy(bus_dma_tag_t dmat);
/*
* Allocate a handle for mapping from kva/uva/physical
* address space into bus device space.
*/
int bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp);
/*
* Destroy a handle for mapping from kva/uva/physical
* address space into bus device space.
*/
int bus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map);
/*
* Allocate a piece of memory that can be efficiently mapped into
* bus device space based on the constraints lited in the dma tag.
* A dmamap to for use with dmamap_load is also allocated.
*/
int bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags,
bus_dmamap_t *mapp);
/*
* Free a piece of memory and it's allociated dmamap, that was allocated
* via bus_dmamem_alloc.
*/
void bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map);
/*
* A function that processes a successfully loaded dma map or an error
* from a delayed load map.
*/
typedef void bus_dmamap_callback_t(void *, bus_dma_segment_t *, int, int);
/*
* Map the buffer buf into bus space using the dmamap map.
*/
int bus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
bus_size_t buflen, bus_dmamap_callback_t *callback,
void *callback_arg, int flags);
/*
* Like bus_dmamap_callback but includes map size in bytes. This is
* defined as a separate interface to maintain compatiiblity for users
* of bus_dmamap_callback_t--at some point these interfaces should be merged.
*/
typedef void bus_dmamap_callback2_t(void *, bus_dma_segment_t *, int, bus_size_t, int);
/*
* Like bus_dmamap_load but for mbufs. Note the use of the
* bus_dmamap_callback2_t interface.
*/
int bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map,
struct mbuf *mbuf,
bus_dmamap_callback2_t *callback, void *callback_arg,
int flags);
/*
* Like bus_dmamap_load but for uios. Note the use of the
* bus_dmamap_callback2_t interface.
*/
int bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map,
struct uio *ui,
bus_dmamap_callback2_t *callback, void *callback_arg,
int flags);
/*
* Perform a syncronization operation on the given map.
*/
void _bus_dmamap_sync(bus_dma_tag_t, bus_dmamap_t, bus_dmasync_op_t);
#define bus_dmamap_sync(dmat, dmamap, op) \
if ((dmamap) != NULL) \
_bus_dmamap_sync(dmat, dmamap, op)
/*
* Release the mapping held by map.
*/
void _bus_dmamap_unload(bus_dma_tag_t dmat, bus_dmamap_t map);
#define bus_dmamap_unload(dmat, dmamap) \
if ((dmamap) != NULL) \
_bus_dmamap_unload(dmat, dmamap)
/*
* Generic helper function for manipulating mutexes.
*/
void busdma_lock_mutex(void *arg, bus_dma_lock_op_t op);
#endif /* _ALPHA_BUS_H_ */