diff options
Diffstat (limited to 'tools/bus_space/busdma.c')
| -rw-r--r-- | tools/bus_space/busdma.c | 218 |
1 files changed, 218 insertions, 0 deletions
diff --git a/tools/bus_space/busdma.c b/tools/bus_space/busdma.c new file mode 100644 index 0000000..1c502e1 --- /dev/null +++ b/tools/bus_space/busdma.c @@ -0,0 +1,218 @@ +/*- + * Copyright (c) 2015 Marcel Moolenaar + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/ioctl.h> +#include <sys/mman.h> +#include <errno.h> +#include <fcntl.h> +#include <limits.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#include "busdma.h" + +#include "../../sys/dev/proto/proto_dev.h" + +struct tag { + int tid; + u_int refcnt; + int fd; + struct tag *ptag; + u_long key; + u_long align; + u_long bndry; + u_long maxaddr; +}; + +static struct tag **tidtbl = NULL; +static int ntids = 0; + +static struct tag * +tag_alloc(void) +{ + struct tag **newtbl, *tag; + int tid; + + tag = malloc(sizeof(struct tag)); + tag->refcnt = 0; + + for (tid = 0; tid < ntids; tid++) { + if (tidtbl[tid] == 0) + break; + } + if (tid == ntids) { + newtbl = realloc(tidtbl, sizeof(struct tag *) * (ntids + 1)); + if (newtbl == NULL) { + free(tag); + return (NULL); + } + tidtbl = newtbl; + ntids++; + } + tidtbl[tid] = tag; + tag->tid = tid; + return (tag); +} + +static int +tag_free(struct tag *tag) +{ + + tidtbl[tag->tid] = NULL; + free(tag); + return (0); +} + +static struct tag * +tid_lookup(int tid) +{ + struct tag *tag; + + if (tid < 0 || tid >= ntids) { + errno = EINVAL; + return (NULL); + } + tag = tidtbl[tid]; + if (tag->refcnt == 0) { + errno = ENXIO; + return (NULL); + } + return (tag); +} + +struct tag * +bd_tag_new(struct tag *ptag, int fd, u_long align, u_long bndry, + u_long maxaddr, u_long maxsz, u_int nsegs, u_long maxsegsz, + u_int datarate, u_int flags) +{ + struct proto_ioc_busdma ioc; + struct tag *tag; + + tag = tag_alloc(); + if (tag == NULL) + return (NULL); + + memset(&ioc, 0, sizeof(ioc)); + ioc.request = (ptag != NULL) ? PROTO_IOC_BUSDMA_TAG_DERIVE : + PROTO_IOC_BUSDMA_TAG_CREATE; + ioc.key = (ptag != NULL) ? ptag->key : 0; + ioc.u.tag.align = align; + ioc.u.tag.bndry = bndry; + ioc.u.tag.maxaddr = maxaddr; + ioc.u.tag.maxsz = maxsz; + ioc.u.tag.nsegs = nsegs; + ioc.u.tag.maxsegsz = maxsegsz; + ioc.u.tag.datarate = datarate; + ioc.u.tag.flags = flags; + if (ioctl(fd, PROTO_IOC_BUSDMA, &ioc) == -1) { + tag_free(tag); + return (NULL); + } + tag->refcnt = 1; + tag->fd = fd; + tag->ptag = ptag; + tag->key = ioc.key; + tag->align = ioc.u.tag.align; + tag->bndry = ioc.u.tag.bndry; + tag->maxaddr = ioc.u.tag.maxaddr; + return (tag); +} + +int +bd_tag_create(const char *dev, u_long align, u_long bndry, u_long maxaddr, + u_long maxsz, u_int nsegs, u_long maxsegsz, u_int datarate, u_int flags) +{ + struct tag *tag; + int fd; + + fd = open(dev, O_RDWR); + if (fd == -1) + return (-1); + + tag = bd_tag_new(NULL, fd, align, bndry, maxaddr, maxsz, nsegs, + maxsegsz, datarate, flags); + if (tag == NULL) { + close(fd); + return (-1); + } + return (tag->tid); +} + +int +bd_tag_derive(int ptid, u_long align, u_long bndry, u_long maxaddr, + u_long maxsz, u_int nsegs, u_long maxsegsz, u_int datarate, u_int flags) +{ + struct tag *ptag, *tag; + + ptag = tid_lookup(ptid); + if (ptag == NULL) + return (-1); + + tag = bd_tag_new(ptag, ptag->fd, align, bndry, maxaddr, maxsz, nsegs, + maxsegsz, datarate, flags); + if (tag == NULL) + return (-1); + while (ptag != NULL) { + ptag->refcnt++; + ptag = ptag->ptag; + } + return (tag->tid); +} + +int +bd_tag_destroy(int tid) +{ + struct proto_ioc_busdma ioc; + struct tag *ptag, *tag; + + tag = tid_lookup(tid); + if (tag == NULL) + return (errno); + if (tag->refcnt > 1) + return (EBUSY); + + memset(&ioc, 0, sizeof(ioc)); + ioc.request = PROTO_IOC_BUSDMA_TAG_DESTROY; + ioc.key = tag->key; + if (ioctl(tag->fd, PROTO_IOC_BUSDMA, &ioc) == -1) + return (errno); + + ptag = tag->ptag; + if (ptag == NULL) + close(tag->fd); + else { + do { + ptag->refcnt--; + ptag = ptag->ptag; + } while (ptag != NULL); + } + tag_free(tag); + return (0); +} |
