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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* hci1394_buf.c
* These routines handle IO mapped memory. They include routines to alloc and
* free IO mapped memory and a routine to get the adapters default dma
* attributes. These routines are meant to be called from the base context.
* They should not be called from an interrupt handler.
*/
#include <sys/conf.h>
#include <sys/ddi.h>
#include <sys/modctl.h>
#include <sys/stat.h>
#include <sys/sunddi.h>
#include <sys/kmem.h>
#include <sys/1394/h1394.h>
#include <sys/1394/adapters/hci1394.h>
/*
* hci1394_buffer_attr_get()
* returns (in dma_attr) the default DMA attributes for this adapter.
*/
void
hci1394_buf_attr_get(ddi_dma_attr_t *dma_attr)
{
dma_attr->dma_attr_version = DMA_ATTR_V0;
dma_attr->dma_attr_addr_lo = (uint64_t)0x00000000;
dma_attr->dma_attr_addr_hi = (uint64_t)0xFFFFFFFF;
dma_attr->dma_attr_count_max = (uint64_t)0xFFFFFFFF;
dma_attr->dma_attr_align = 64;
dma_attr->dma_attr_burstsizes = 0x3FF;
dma_attr->dma_attr_minxfer = 1;
dma_attr->dma_attr_maxxfer = (uint64_t)0xFFFFFFFF;
dma_attr->dma_attr_seg = (uint64_t)0xFFFFFFFF;
dma_attr->dma_attr_sgllen = 0x7FFFFFFF;
dma_attr->dma_attr_granular = 4;
dma_attr->dma_attr_flags = 0;
#if defined(__x86)
/* XXX - Not sure why x86 wants the dma_attr_seg to be 0x7FFF?? */
dma_attr->dma_attr_seg = (uint64_t)0x7FFF;
#endif
}
/*
* hci1394_buf_alloc()
* Allocate an IO mapped buffer. drvinfo is passed in and contains generic
* driver info, like dip, instance, buf_attr, etc. Parms is passed in and
* contains the input parameters for alloc, ow much memory to alloc, how many
* cookies can we handle, and alignment requirements. info is returned with
* all the info about the mapped buffer. handle is returned. It should be
* used when calling hci1394_buf_free().
*/
int
hci1394_buf_alloc(hci1394_drvinfo_t *drvinfo, hci1394_buf_parms_t *parms,
hci1394_buf_info_t *info, hci1394_buf_handle_t *handle)
{
ddi_dma_attr_t dma_attr;
hci1394_buf_t *buf;
int status;
ASSERT(drvinfo != NULL);
ASSERT(parms != NULL);
ASSERT(info != NULL);
ASSERT(handle != NULL);
/* alloc the space to keep track of the buffer */
buf = kmem_alloc(sizeof (hci1394_buf_t), KM_SLEEP);
/* setup the return parameter */
*handle = buf;
/* save away pointer to general info */
buf->bu_drvinfo = drvinfo;
/* Get the default DMA attributes and override sgllen and alignment */
_NOTE(SCHEME_PROTECTS_DATA("unique (on stack)", ddi_dma_attr_t))
hci1394_buf_attr_get(&dma_attr);
dma_attr.dma_attr_sgllen = parms->bp_max_cookies;
dma_attr.dma_attr_align = parms->bp_alignment;
status = ddi_dma_alloc_handle(drvinfo->di_dip, &dma_attr,
DDI_DMA_SLEEP, NULL, &buf->bu_dma_handle);
if (status != DDI_SUCCESS) {
kmem_free(buf, sizeof (hci1394_buf_t));
return (DDI_FAILURE);
}
status = ddi_dma_mem_alloc(buf->bu_dma_handle, parms->bp_length,
&drvinfo->di_buf_attr, DDI_DMA_STREAMING, DDI_DMA_SLEEP,
NULL, &info->bi_kaddr, &info->bi_real_length, &buf->bu_handle);
if (status != DDI_SUCCESS) {
ddi_dma_free_handle(&buf->bu_dma_handle);
kmem_free(buf, sizeof (hci1394_buf_t));
return (DDI_FAILURE);
}
status = ddi_dma_addr_bind_handle(buf->bu_dma_handle, NULL,
info->bi_kaddr, info->bi_real_length, DDI_DMA_RDWR |
DDI_DMA_STREAMING, DDI_DMA_SLEEP, NULL, &info->bi_cookie,
&info->bi_cookie_count);
if (status != DDI_SUCCESS) {
ddi_dma_mem_free(&buf->bu_handle);
ddi_dma_free_handle(&buf->bu_dma_handle);
kmem_free(buf, sizeof (hci1394_buf_t));
return (DDI_FAILURE);
}
/* setup rest of buffer info returned to caller */
info->bi_handle = buf->bu_handle;
info->bi_dma_handle = buf->bu_dma_handle;
info->bi_length = parms->bp_length;
return (DDI_SUCCESS);
}
/*
* hci1394_buf_free()
* Free IO mapped buffer. Notice that a pointer to the handle is used for
* the parameter. free() will set your handle to NULL before returning.
*/
void
hci1394_buf_free(hci1394_buf_handle_t *handle)
{
hci1394_buf_t *buf;
ASSERT(handle != NULL);
buf = *handle;
(void) ddi_dma_unbind_handle(buf->bu_dma_handle);
ddi_dma_mem_free(&buf->bu_handle);
ddi_dma_free_handle(&buf->bu_dma_handle);
/* free the space to keep track of the buffer */
kmem_free(buf, sizeof (hci1394_buf_t));
/* set the handle to NULL to help catch bugs */
*handle = NULL;
}
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