1 /*- 2 * Copyright (c) 2018-2019 Ruslan Bukin <br@bsdpad.com> 3 * All rights reserved. 4 * 5 * This software was developed by SRI International and the University of 6 * Cambridge Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237 7 * ("CTSRD"), as part of the DARPA CRASH research programme. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include "opt_platform.h" 35 #include <sys/param.h> 36 #include <sys/conf.h> 37 #include <sys/bus.h> 38 #include <sys/kernel.h> 39 #include <sys/lock.h> 40 #include <sys/malloc.h> 41 #include <sys/mutex.h> 42 43 #include <machine/bus.h> 44 45 #include <dev/xdma/xdma.h> 46 47 void 48 xchan_bank_init(xdma_channel_t *xchan) 49 { 50 struct xdma_request *xr; 51 xdma_controller_t *xdma; 52 int i; 53 54 xdma = xchan->xdma; 55 KASSERT(xdma != NULL, ("xdma is NULL")); 56 57 xchan->xr_mem = malloc(sizeof(struct xdma_request) * xchan->xr_num, 58 M_XDMA, M_WAITOK | M_ZERO); 59 60 for (i = 0; i < xchan->xr_num; i++) { 61 xr = &xchan->xr_mem[i]; 62 TAILQ_INSERT_TAIL(&xchan->bank, xr, xr_next); 63 } 64 } 65 66 int 67 xchan_bank_free(xdma_channel_t *xchan) 68 { 69 70 free(xchan->xr_mem, M_XDMA); 71 72 return (0); 73 } 74 75 struct xdma_request * 76 xchan_bank_get(xdma_channel_t *xchan) 77 { 78 struct xdma_request *xr; 79 struct xdma_request *xr_tmp; 80 81 QUEUE_BANK_LOCK(xchan); 82 TAILQ_FOREACH_SAFE(xr, &xchan->bank, xr_next, xr_tmp) { 83 TAILQ_REMOVE(&xchan->bank, xr, xr_next); 84 break; 85 } 86 QUEUE_BANK_UNLOCK(xchan); 87 88 return (xr); 89 } 90 91 int 92 xchan_bank_put(xdma_channel_t *xchan, struct xdma_request *xr) 93 { 94 95 QUEUE_BANK_LOCK(xchan); 96 TAILQ_INSERT_TAIL(&xchan->bank, xr, xr_next); 97 QUEUE_BANK_UNLOCK(xchan); 98 99 return (0); 100 } 101