| 1 | /*
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| 2 | * Copyright (c) 2011 Jan Vesely
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 | /** @addtogroup drvaudiosb16
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| 29 | * @{
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| 30 | */
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| 31 | /** @file
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| 32 | * @brief DMA memory management
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| 33 | */
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| 34 | #ifndef DRV_AUDIO_SB16_DMA_H
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| 35 | #define DRV_AUDIO_SB16_DMA_H
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| 36 |
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| 37 | #include <errno.h>
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| 38 | #include <mem.h>
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| 39 | #include <as.h>
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| 40 |
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| 41 | #include "ddf_log.h"
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| 42 |
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| 43 | #define DMA_ALIGNENT 1024
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| 44 |
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| 45 | /** Get physical address translation
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| 46 | *
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| 47 | * @param[in] addr Virtual address to translate
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| 48 | * @return Physical address if exists, NULL otherwise.
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| 49 | */
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| 50 | static inline uintptr_t addr_to_phys(const void *addr)
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| 51 | {
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| 52 | if (addr == NULL)
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| 53 | return 0;
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| 54 |
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| 55 | uintptr_t result;
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| 56 | const int ret = as_get_physical_mapping(addr, &result);
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| 57 | if (ret != EOK)
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| 58 | return 0;
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| 59 | return (result | ((uintptr_t)addr & 0xfff));
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| 60 | }
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| 61 |
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| 62 | /** DMA mallocator simulator
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| 63 | *
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| 64 | * @param[in] size Size of the required memory space
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| 65 | * @return Address of the aligned and big enough memory place, NULL on failure.
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| 66 | */
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| 67 | static inline void *dma_create_buffer24(size_t size)
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| 68 | {
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| 69 | void *address =
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| 70 | as_area_create(AS_AREA_ANY, size, AS_AREA_READ | AS_AREA_WRITE);
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| 71 | bzero(address, size);
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| 72 | uintptr_t ptr = 0;
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| 73 | as_get_physical_mapping(address, &ptr);
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| 74 | if ((ptr & 0xffffff) != ptr) {
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| 75 | ddf_log_debug("%s: Can not provide invalid buffer %x.",
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| 76 | __FUNCTION__, ptr);
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| 77 | as_area_destroy(address);
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| 78 | return NULL;
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| 79 | }
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| 80 | ddf_log_verbose("%s: Buffer mapped at %x.", __FUNCTION__, ptr);
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| 81 | return address;
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| 82 | }
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| 83 |
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| 84 | /** DMA mallocator simulator
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| 85 | *
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| 86 | * @param[in] addr Address of the place allocated by dma_create_buffer24
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| 87 | */
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| 88 | static inline void dma_destroy_buffer(void *page)
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| 89 | {
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| 90 | if (page)
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| 91 | as_area_destroy(page);
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| 92 | }
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| 93 |
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| 94 |
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| 95 | #endif
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| 96 | /**
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| 97 | * @}
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| 98 | */
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