[1] | 1 | /* |
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| 2 | * soclib_dma.c - soclib DMA driver |
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| 3 | * |
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| 4 | * Copyright (c) 2008,2009,2010,2011,2012 Ghassan Almaless |
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| 5 | * Copyright (c) 2011,2012 UPMC Sorbonne Universites |
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| 6 | * |
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| 7 | * This file is part of ALMOS-kernel. |
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| 8 | * |
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| 9 | * ALMOS-kernel is free software; you can redistribute it and/or modify it |
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| 10 | * under the terms of the GNU General Public License as published by |
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| 11 | * the Free Software Foundation; version 2.0 of the License. |
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| 12 | * |
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| 13 | * ALMOS-kernel is distributed in the hope that it will be useful, but |
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| 14 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 16 | * General Public License for more details. |
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| 17 | * |
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| 18 | * You should have received a copy of the GNU General Public License |
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| 19 | * along with ALMOS-kernel; if not, write to the Free Software Foundation, |
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| 20 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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| 21 | */ |
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| 22 | |
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| 23 | #include <errno.h> |
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| 24 | #include <cpu.h> |
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| 25 | #include <device.h> |
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| 26 | #include <driver.h> |
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| 27 | #include <drvdb.h> |
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| 28 | #include <kmem.h> |
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| 29 | #include <scheduler.h> |
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| 30 | #include <thread.h> |
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| 31 | #include <task.h> |
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| 32 | #include <list.h> |
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| 33 | #include <event.h> |
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| 34 | #include <soclib_dma.h> |
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| 35 | #include <string.h> |
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| 36 | |
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| 37 | /* DMA mapped registers offset */ |
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| 38 | #define DMA_SRC_REG 0 |
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| 39 | #define DMA_DST_REG 1 |
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| 40 | #define DMA_LEN_REG 2 |
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| 41 | #define DMA_RESET_REG 3 |
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| 42 | #define DMA_IRQ_DISABLED 4 |
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| 43 | |
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| 44 | struct dma_context_s |
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| 45 | { |
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| 46 | struct list_entry request_queue; |
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| 47 | struct wait_queue_s pending; |
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| 48 | }; |
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| 49 | |
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| 50 | static void dma_start_request(struct device_s *dma, dev_request_t *ptr) |
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| 51 | { |
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| 52 | volatile uint32_t *base = dma->base; |
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| 53 | dev_request_t *rq; |
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| 54 | |
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| 55 | rq = (ptr->flags & DEV_RQ_NESTED) ? ptr->data : ptr; |
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| 56 | |
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| 57 | base[DMA_SRC_REG] = (unsigned int)rq->src; |
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| 58 | base[DMA_DST_REG] = (unsigned int)rq->dst; |
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| 59 | base[DMA_IRQ_DISABLED] = 0; |
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| 60 | base[DMA_LEN_REG] = rq->count; |
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| 61 | } |
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| 62 | |
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| 63 | static void dma_irq_handler(struct irq_action_s *action) |
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| 64 | { |
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| 65 | struct dma_context_s *ctx; |
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| 66 | struct device_s *dma; |
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| 67 | dev_request_t *rq; |
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| 68 | dev_request_t *frag; |
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| 69 | dev_request_t *new_rq; |
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| 70 | error_t err; |
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| 71 | volatile uint32_t *base; |
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| 72 | struct thread_s *this; |
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| 73 | |
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| 74 | dma = action->dev; |
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| 75 | base = dma->base; |
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| 76 | ctx = (struct dma_context_s*)dma->data; |
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| 77 | |
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| 78 | cpu_spinlock_lock(&dma->lock.val); |
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| 79 | |
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| 80 | err = base[DMA_LEN_REG]; |
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| 81 | base[DMA_RESET_REG] = 0; |
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| 82 | |
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| 83 | /* even if this case is realy low probable, we have to check for empty list ! */ |
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| 84 | if(list_empty(&ctx->request_queue)) |
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| 85 | { |
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| 86 | cpu_spinlock_unlock(&dma->lock.val); |
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| 87 | return; |
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| 88 | } |
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| 89 | |
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| 90 | rq = list_first(&ctx->request_queue, dev_request_t, list); |
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| 91 | |
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| 92 | if(rq->flags & DEV_RQ_NESTED) |
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| 93 | { |
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| 94 | frag = rq->data; |
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| 95 | |
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| 96 | event_set_error(&frag->event, err); |
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| 97 | event_set_senderId(&frag->event, dma); |
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| 98 | event_send(&frag->event, current_cpu->gid); |
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| 99 | |
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| 100 | if((err == 0) && (frag->data != NULL)) |
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| 101 | { |
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| 102 | rq->data = frag->data; |
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| 103 | dma_start_request(dma,frag->data); |
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| 104 | cpu_spinlock_unlock(&dma->lock.val); |
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| 105 | return; |
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| 106 | } |
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| 107 | } |
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| 108 | |
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| 109 | list_unlink(&rq->list); |
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| 110 | |
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| 111 | if(!(list_empty(&ctx->request_queue))) |
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| 112 | { |
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| 113 | new_rq = list_first(&ctx->request_queue, dev_request_t, list); |
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| 114 | dma_start_request(dma,new_rq); |
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| 115 | } |
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| 116 | |
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| 117 | if(!(rq->flags & DEV_RQ_NOBLOCK)) |
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| 118 | { |
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| 119 | rq->err = err; |
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| 120 | wakeup_one(&ctx->pending, WAIT_FIRST); |
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| 121 | cpu_spinlock_unlock(&dma->lock.val); |
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| 122 | return; |
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| 123 | } |
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| 124 | |
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| 125 | cpu_spinlock_unlock(&dma->lock.val); |
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| 126 | |
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| 127 | this = CURRENT_THREAD; |
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| 128 | |
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| 129 | event_set_error(&rq->event, err); |
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| 130 | event_set_senderId(&rq->event, dma); |
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| 131 | event_send(&rq->event, current_cpu->gid); |
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| 132 | } |
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| 133 | |
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| 134 | static void dma_fraglist_destroy(dev_request_t *ptr) |
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| 135 | { |
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| 136 | kmem_req_t req; |
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| 137 | dev_request_t *frag; |
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| 138 | |
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| 139 | req.type = KMEM_DMA_REQUEST; |
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| 140 | frag = ptr; |
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| 141 | |
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| 142 | while(frag != NULL); |
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| 143 | { |
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| 144 | req.ptr = frag; |
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| 145 | frag = frag->data; |
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| 146 | |
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| 147 | kmem_free(&req); |
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| 148 | } |
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| 149 | } |
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| 150 | |
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| 151 | static EVENT_HANDLER(dma_async_frag_event) |
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| 152 | { |
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| 153 | dev_request_t *frag; |
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| 154 | kmem_req_t req; |
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| 155 | error_t err; |
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| 156 | |
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| 157 | frag = event_get_argument(event); |
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| 158 | err = event_get_error(event); |
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| 159 | |
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| 160 | assert(frag != NULL && "corrupted frag"); |
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| 161 | |
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| 162 | if(err) |
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| 163 | { |
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| 164 | dma_fraglist_destroy(frag); |
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| 165 | return 0; |
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| 166 | } |
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| 167 | |
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| 168 | req.type = KMEM_DMA_REQUEST; |
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| 169 | req.ptr = frag; |
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| 170 | |
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| 171 | kmem_free(&req); |
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| 172 | return 0; |
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| 173 | } |
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| 174 | |
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| 175 | static error_t dma_frag_init(dev_request_t *frag, uint_t src_start, uint_t dst_start, uint_t count) |
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| 176 | { |
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| 177 | //FIXME(40) use extent registers |
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| 178 | frag->src = task_vaddr2paddr(current_task, (void*)src_start); |
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| 179 | frag->dst = task_vaddr2paddr(current_task, (void*)dst_start); |
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| 180 | frag->count = count; |
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| 181 | frag->flags = 0; |
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| 182 | |
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| 183 | if((frag->src == NULL) || (frag->dst == NULL)) |
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| 184 | return EPERM; |
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| 185 | |
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| 186 | event_set_priority(&frag->event, E_FUNC); |
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| 187 | event_set_handler(&frag->event, &dma_async_frag_event); |
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| 188 | event_set_argument(&frag->event, frag); |
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| 189 | return 0; |
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| 190 | } |
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| 191 | |
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| 192 | static error_t dma_fraglist_build(dev_request_t *rq) |
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| 193 | { |
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| 194 | kmem_req_t req; |
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| 195 | dev_request_t *frag; |
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| 196 | dev_request_t *parent_frag; |
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| 197 | struct slist_entry *root; |
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| 198 | struct slist_entry *iter; |
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| 199 | uint_t src_start; |
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| 200 | uint_t dst_start; |
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| 201 | uint_t count; |
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| 202 | error_t err; |
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| 203 | |
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| 204 | if(rq->count == 0) |
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| 205 | return EINVAL; |
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| 206 | |
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| 207 | src_start = (uint_t)rq->src; |
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| 208 | dst_start = (uint_t)rq->dst; |
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| 209 | |
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| 210 | if((src_start + rq->count) <= ((src_start & ~PMM_PAGE_MASK) + PMM_PAGE_SIZE) && |
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| 211 | (dst_start + rq->count) <= ((dst_start & ~PMM_PAGE_MASK) + PMM_PAGE_SIZE)) |
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| 212 | { |
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| 213 | //FIXME(40) use extent registers |
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| 214 | rq->src = task_vaddr2paddr(current_task, rq->src); |
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| 215 | rq->dst = task_vaddr2paddr(current_task, rq->dst); |
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| 216 | |
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| 217 | if((rq->src == NULL) || (rq->dst == NULL)) |
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| 218 | return EPERM; |
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| 219 | |
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| 220 | return 0; |
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| 221 | } |
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| 222 | |
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| 223 | if((src_start & PMM_PAGE_MASK) || (dst_start & PMM_PAGE_MASK)) { |
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| 224 | return ENOSYS; |
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| 225 | } |
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| 226 | |
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| 227 | req.type = KMEM_DMA_REQUEST; |
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| 228 | req.size = sizeof(*rq); |
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| 229 | req.flags = AF_KERNEL; |
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| 230 | root = (struct slist_entry *)&rq->data; |
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| 231 | iter = (struct slist_entry *)&rq->list; |
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| 232 | count = rq->count; |
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| 233 | rq->data = NULL; |
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| 234 | rq->flags &= ~DEV_RQ_NESTED; |
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| 235 | parent_frag = rq; |
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| 236 | |
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| 237 | while(count) |
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| 238 | { |
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| 239 | frag = kmem_alloc(&req); |
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| 240 | |
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| 241 | if(frag == NULL) |
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| 242 | { |
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| 243 | err = ENOMEM; |
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| 244 | goto fail_nomem; |
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| 245 | } |
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| 246 | |
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| 247 | if(count >= PMM_PAGE_SIZE) |
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| 248 | { |
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| 249 | err = dma_frag_init(frag, src_start, dst_start, PMM_PAGE_SIZE); |
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| 250 | |
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| 251 | if(err) |
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| 252 | goto fail_init; |
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| 253 | |
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| 254 | src_start += PMM_PAGE_SIZE; |
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| 255 | dst_start += PMM_PAGE_SIZE; |
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| 256 | count -= PMM_PAGE_SIZE; |
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| 257 | } |
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| 258 | else |
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| 259 | { |
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| 260 | err = dma_frag_init(frag, src_start, dst_start, count); |
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| 261 | |
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| 262 | if(err) |
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| 263 | goto fail_init; |
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| 264 | |
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| 265 | count -= count; |
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| 266 | } |
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| 267 | |
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| 268 | parent_frag->data = frag; |
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| 269 | frag->data = NULL; |
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| 270 | parent_frag = frag; |
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| 271 | } |
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| 272 | |
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| 273 | rq->flags |= DEV_RQ_NESTED; |
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| 274 | return 0; |
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| 275 | |
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| 276 | fail_init: |
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| 277 | fail_nomem: |
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| 278 | dma_fraglist_destroy(rq->data); |
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| 279 | return err; |
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| 280 | } |
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| 281 | |
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| 282 | |
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| 283 | static sint_t dma_request(struct device_s *dma, dev_request_t *rq) |
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| 284 | { |
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| 285 | struct dma_context_s *ctx; |
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| 286 | uint_t irq_state; |
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| 287 | sint_t err; |
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| 288 | |
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| 289 | rq->err = 0; |
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| 290 | ctx = (struct dma_context_s*)dma->data; |
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| 291 | |
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| 292 | err = dma_fraglist_build(rq); |
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| 293 | |
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| 294 | if(err) |
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| 295 | return err; |
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| 296 | |
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| 297 | spinlock_lock_noirq(&dma->lock,&irq_state); |
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| 298 | |
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| 299 | if(list_empty(&ctx->request_queue)) |
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| 300 | { |
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| 301 | list_add(&ctx->request_queue, &rq->list); |
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| 302 | dma_start_request(dma, rq); |
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| 303 | } |
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| 304 | else |
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| 305 | list_add_last(&ctx->request_queue, &rq->list); |
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| 306 | |
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| 307 | if(rq->flags & DEV_RQ_NOBLOCK) |
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| 308 | { |
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| 309 | spinlock_unlock_noirq(&dma->lock, irq_state); |
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| 310 | return 0; |
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| 311 | } |
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| 312 | |
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| 313 | wait_on(&ctx->pending, WAIT_LAST); |
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| 314 | spinlock_unlock_noirq(&dma->lock,irq_state); |
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| 315 | sched_sleep(CURRENT_THREAD); |
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| 316 | |
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| 317 | return rq->err; |
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| 318 | } |
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| 319 | |
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| 320 | static sint_t dma_open(struct device_s *dma, dev_request_t *rq) |
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| 321 | { |
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| 322 | return EPERM; |
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| 323 | } |
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| 324 | |
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| 325 | struct device_s *__sys_dma; |
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| 326 | static uint_t dma_count = 0; |
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| 327 | |
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| 328 | error_t soclib_dma_init(struct device_s *dma) |
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| 329 | { |
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| 330 | kmem_req_t req; |
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| 331 | struct dma_context_s *ctx; |
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| 332 | |
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| 333 | spinlock_init(&dma->lock,"DevDMA (SoCLib)"); |
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| 334 | dma->type = DEV_BLK; |
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| 335 | |
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| 336 | dma->action.dev = dma; |
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| 337 | dma->action.irq_handler = &dma_irq_handler; |
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| 338 | dma->action.data = NULL; |
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| 339 | |
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| 340 | if(dma_count == 0) |
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| 341 | __sys_dma = dma; |
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| 342 | |
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| 343 | sprintk(dma->name, |
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| 344 | #if CONFIG_ROOTFS_IS_VFAT |
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| 345 | "DMA%d" |
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| 346 | #else |
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| 347 | "dma%d" |
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| 348 | #endif |
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| 349 | ,dma_count++); |
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| 350 | |
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| 351 | metafs_init(&dma->node, dma->name); |
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| 352 | |
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| 353 | dma->op.dev.open = &dma_open; |
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| 354 | dma->op.dev.read = &dma_request; |
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| 355 | dma->op.dev.write = &dma_request; |
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| 356 | dma->op.dev.close = NULL; |
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| 357 | dma->op.dev.lseek = NULL; |
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| 358 | dma->op.dev.mmap = NULL; |
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| 359 | dma->op.dev.munmap = NULL; |
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| 360 | dma->op.dev.set_params = NULL; |
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| 361 | dma->op.dev.get_params = NULL; |
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| 362 | dma->op.drvid = SOCLIB_DMA_ID; |
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| 363 | |
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| 364 | req.type = KMEM_GENERIC; |
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| 365 | req.size = sizeof(*ctx); |
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| 366 | req.flags = AF_BOOT | AF_ZERO; |
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| 367 | |
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| 368 | if((ctx = kmem_alloc(&req)) == NULL) |
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| 369 | return ENOMEM; |
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| 370 | |
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| 371 | wait_queue_init(&ctx->pending, dma->name); |
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| 372 | list_root_init(&ctx->request_queue); |
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| 373 | dma->data = (void *)ctx; |
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| 374 | return 0; |
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| 375 | } |
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| 376 | |
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| 377 | driver_t soclib_dma_driver = { .init = &soclib_dma_init }; |
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