/*- * Copyright (C) 2013 Emulex * 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. Neither the name of the Emulex Corporation 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 COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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. * * Contact Information: * freebsd-drivers@emulex.com * * Emulex * 3333 Susan Street * Costa Mesa, CA 92626 */ /* $FreeBSD$ */ #include "oce_if.h" static void oce_dma_map_ring(void *arg, bus_dma_segment_t *segs, int nseg, int error); /** * @brief Allocate DMA memory * @param sc software handle to the device * @param size bus size * @param dma dma memory area * @param flags creation flags * @returns 0 on success, error otherwize */ int oce_dma_alloc(POCE_SOFTC sc, bus_size_t size, POCE_DMA_MEM dma, int flags) { int rc; memset(dma, 0, sizeof(OCE_DMA_MEM)); rc = bus_dma_tag_create(bus_get_dma_tag(sc->dev), 8, 0, BUS_SPACE_MAXADDR, BUS_SPACE_MAXADDR, NULL, NULL, size, 1, size, 0, NULL, NULL, &dma->tag); if (rc == 0) { rc = bus_dmamem_alloc(dma->tag, &dma->ptr, BUS_DMA_NOWAIT | BUS_DMA_COHERENT | BUS_DMA_ZERO, &dma->map); } dma->paddr = 0; if (rc == 0) { rc = bus_dmamap_load(dma->tag, dma->map, dma->ptr, size, oce_dma_map_addr, &dma->paddr, flags | BUS_DMA_NOWAIT); if (dma->paddr == 0) rc = ENXIO; } if (rc != 0) oce_dma_free(sc, dma); return rc; } /** * @brief Free DMA memory * @param sc software handle to the device * @param dma dma area to free */ void oce_dma_free(POCE_SOFTC sc, POCE_DMA_MEM dma) { if (dma->tag == NULL) return; if (dma->map != NULL) { bus_dmamap_sync(dma->tag, dma->map, BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE); bus_dmamap_unload(dma->tag, dma->map); } if (dma->ptr != NULL) { bus_dmamem_free(dma->tag, dma->ptr, dma->map); dma->map = NULL; dma->ptr = NULL; } bus_dma_tag_destroy(dma->tag); dma->tag = NULL; return; } /** * @brief Map DMA memory segment addresses * @param arg physical address pointer * @param segs dma memory segments * @param nseg number of dma memory segments * @param error if error, zeroes the physical address */ void oce_dma_map_addr(void *arg, bus_dma_segment_t * segs, int nseg, int error) { bus_addr_t *paddr = arg; if (error) *paddr = 0; else *paddr = segs->ds_addr; } /** * @brief Destroy a ring buffer * @param sc software handle to the device * @param ring ring buffer */ void oce_destroy_ring_buffer(POCE_SOFTC sc, oce_ring_buffer_t *ring) { oce_dma_free(sc, &ring->dma); free(ring, M_DEVBUF); } oce_ring_buffer_t * oce_create_ring_buffer(POCE_SOFTC sc, uint32_t q_len, uint32_t item_size) { uint32_t size = q_len * item_size; int rc; oce_ring_buffer_t *ring; ring = malloc(sizeof(oce_ring_buffer_t), M_DEVBUF, M_NOWAIT | M_ZERO); if (ring == NULL) return NULL; ring->item_size = item_size; ring->num_items = q_len; rc = bus_dma_tag_create(bus_get_dma_tag(sc->dev), 4096, 0, BUS_SPACE_MAXADDR, BUS_SPACE_MAXADDR, NULL, NULL, size, 8, 4096, 0, NULL, NULL, &ring->dma.tag); if (rc) goto fail; rc = bus_dmamem_alloc(ring->dma.tag, &ring->dma.ptr, BUS_DMA_NOWAIT | BUS_DMA_COHERENT, &ring->dma.map); if (rc) goto fail; bzero(ring->dma.ptr, size); bus_dmamap_sync(ring->dma.tag, ring->dma.map, BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE); ring->dma.paddr = 0; return ring; fail: oce_dma_free(sc, &ring->dma); free(ring, M_DEVBUF); ring = NULL; return NULL; } struct _oce_dmamap_paddr_table { uint32_t max_entries; uint32_t num_entries; struct phys_addr *paddrs; }; /** * @brief Map ring buffer * @param arg dma map phyical address table pointer * @param segs dma memory segments * @param nseg number of dma memory segments * @param error maps only if error is 0 */ static void oce_dma_map_ring(void *arg, bus_dma_segment_t * segs, int nseg, int error) { int i; struct _oce_dmamap_paddr_table *dpt = (struct _oce_dmamap_paddr_table *)arg; if (error == 0) { if (nseg <= dpt->max_entries) { for (i = 0; i < nseg; i++) { dpt->paddrs[i].lo = ADDR_LO(segs[i].ds_addr); dpt->paddrs[i].hi = ADDR_HI(segs[i].ds_addr); } dpt->num_entries = nseg; } } } /** * @brief Load bus dma map for a ring buffer * @param ring ring buffer pointer * @param pa_list physical address list * @returns number entries */ uint32_t oce_page_list(oce_ring_buffer_t *ring, struct phys_addr *pa_list) { struct _oce_dmamap_paddr_table dpt; dpt.max_entries = 8; dpt.num_entries = 0; dpt.paddrs = pa_list; bus_dmamap_load(ring->dma.tag, ring->dma.map, ring->dma.ptr, ring->item_size * ring->num_items, oce_dma_map_ring, &dpt, BUS_DMA_NOWAIT); return dpt.num_entries; }