7282444b10
Mainly focus on files that use BSD 3-Clause license. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. Special thanks to Wind River for providing access to "The Duke of Highlander" tool: an older (2014) run over FreeBSD tree was useful as a starting point.
272 lines
6.1 KiB
C
272 lines
6.1 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (C) 2013 Emulex
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* 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 are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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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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*
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* 3. Neither the name of the Emulex Corporation nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* 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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* Contact Information:
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* freebsd-drivers@emulex.com
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*
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* Emulex
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* 3333 Susan Street
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* Costa Mesa, CA 92626
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*/
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/* $FreeBSD$ */
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#include "oce_if.h"
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static void oce_dma_map_ring(void *arg,
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bus_dma_segment_t *segs,
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int nseg,
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int error);
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/**
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* @brief Allocate DMA memory
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* @param sc software handle to the device
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* @param size bus size
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* @param dma dma memory area
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* @param flags creation flags
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* @returns 0 on success, error otherwize
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*/
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int
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oce_dma_alloc(POCE_SOFTC sc, bus_size_t size, POCE_DMA_MEM dma, int flags)
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{
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int rc;
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memset(dma, 0, sizeof(OCE_DMA_MEM));
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rc = bus_dma_tag_create(bus_get_dma_tag(sc->dev),
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8, 0,
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BUS_SPACE_MAXADDR,
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BUS_SPACE_MAXADDR,
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NULL, NULL,
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size, 1, size, 0, NULL, NULL, &dma->tag);
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if (rc == 0) {
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rc = bus_dmamem_alloc(dma->tag,
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&dma->ptr,
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BUS_DMA_NOWAIT | BUS_DMA_COHERENT |
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BUS_DMA_ZERO,
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&dma->map);
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}
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dma->paddr = 0;
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if (rc == 0) {
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rc = bus_dmamap_load(dma->tag,
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dma->map,
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dma->ptr,
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size,
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oce_dma_map_addr,
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&dma->paddr, flags | BUS_DMA_NOWAIT);
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if (dma->paddr == 0)
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rc = ENXIO;
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}
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if (rc != 0)
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oce_dma_free(sc, dma);
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return rc;
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}
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/**
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* @brief Free DMA memory
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* @param sc software handle to the device
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* @param dma dma area to free
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*/
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void
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oce_dma_free(POCE_SOFTC sc, POCE_DMA_MEM dma)
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{
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if (dma->tag == NULL)
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return;
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if (dma->paddr != 0) {
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bus_dmamap_sync(dma->tag, dma->map,
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BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
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bus_dmamap_unload(dma->tag, dma->map);
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dma->paddr = 0;
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}
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if (dma->ptr != NULL) {
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bus_dmamem_free(dma->tag, dma->ptr, dma->map);
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dma->ptr = NULL;
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}
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bus_dma_tag_destroy(dma->tag);
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dma->tag = NULL;
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return;
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}
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/**
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* @brief Map DMA memory segment addresses
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* @param arg physical address pointer
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* @param segs dma memory segments
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* @param nseg number of dma memory segments
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* @param error if error, zeroes the physical address
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*/
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void
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oce_dma_map_addr(void *arg, bus_dma_segment_t * segs, int nseg, int error)
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{
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bus_addr_t *paddr = arg;
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if (error)
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*paddr = 0;
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else
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*paddr = segs->ds_addr;
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}
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/**
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* @brief Destroy a ring buffer
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* @param sc software handle to the device
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* @param ring ring buffer
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*/
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void
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oce_destroy_ring_buffer(POCE_SOFTC sc, oce_ring_buffer_t *ring)
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{
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oce_dma_free(sc, &ring->dma);
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free(ring, M_DEVBUF);
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}
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oce_ring_buffer_t *
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oce_create_ring_buffer(POCE_SOFTC sc,
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uint32_t q_len, uint32_t item_size)
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{
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uint32_t size = q_len * item_size;
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int rc;
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oce_ring_buffer_t *ring;
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ring = malloc(sizeof(oce_ring_buffer_t), M_DEVBUF, M_NOWAIT | M_ZERO);
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if (ring == NULL)
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return NULL;
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ring->item_size = item_size;
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ring->num_items = q_len;
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rc = bus_dma_tag_create(bus_get_dma_tag(sc->dev),
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4096, 0,
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BUS_SPACE_MAXADDR,
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BUS_SPACE_MAXADDR,
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NULL, NULL,
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size, 8, 4096, 0, NULL, NULL, &ring->dma.tag);
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if (rc)
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goto fail;
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rc = bus_dmamem_alloc(ring->dma.tag,
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&ring->dma.ptr,
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BUS_DMA_NOWAIT | BUS_DMA_COHERENT,
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&ring->dma.map);
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if (rc)
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goto fail;
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bzero(ring->dma.ptr, size);
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bus_dmamap_sync(ring->dma.tag, ring->dma.map,
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BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
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ring->dma.paddr = 0;
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return ring;
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fail:
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oce_dma_free(sc, &ring->dma);
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free(ring, M_DEVBUF);
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ring = NULL;
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return NULL;
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}
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struct _oce_dmamap_paddr_table {
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uint32_t max_entries;
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uint32_t num_entries;
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struct phys_addr *paddrs;
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};
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/**
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* @brief Map ring buffer
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* @param arg dma map phyical address table pointer
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* @param segs dma memory segments
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* @param nseg number of dma memory segments
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* @param error maps only if error is 0
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*/
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static void
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oce_dma_map_ring(void *arg, bus_dma_segment_t * segs, int nseg, int error)
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{
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int i;
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struct _oce_dmamap_paddr_table *dpt =
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(struct _oce_dmamap_paddr_table *)arg;
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if (error == 0) {
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if (nseg <= dpt->max_entries) {
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for (i = 0; i < nseg; i++) {
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dpt->paddrs[i].lo = ADDR_LO(segs[i].ds_addr);
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dpt->paddrs[i].hi = ADDR_HI(segs[i].ds_addr);
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}
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dpt->num_entries = nseg;
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}
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}
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}
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/**
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* @brief Load bus dma map for a ring buffer
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* @param ring ring buffer pointer
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* @param pa_list physical address list
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* @returns number entries
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*/
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uint32_t
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oce_page_list(oce_ring_buffer_t *ring, struct phys_addr *pa_list)
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{
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struct _oce_dmamap_paddr_table dpt;
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dpt.max_entries = 8;
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dpt.num_entries = 0;
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dpt.paddrs = pa_list;
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bus_dmamap_load(ring->dma.tag,
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ring->dma.map,
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ring->dma.ptr,
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ring->item_size * ring->num_items,
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oce_dma_map_ring, &dpt, BUS_DMA_NOWAIT);
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return dpt.num_entries;
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}
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