/* $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. */ /* $FreeBSD$ */ #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_ */