1 | /** |
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2 | * @file |
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3 | * |
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4 | * @ingroup rtems_bsd_rtems |
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5 | * |
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6 | * @brief TODO. |
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7 | * |
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8 | * File origin from FreeBSD "sys/powerpc/powerpc/busdma_machdep.c". |
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9 | */ |
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10 | |
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11 | /*- |
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12 | * Copyright (c) 2012 embedded brains GmbH. |
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13 | * All rights reserved. |
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14 | * |
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15 | * embedded brains GmbH |
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16 | * Obere Lagerstr. 30 |
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17 | * 82178 Puchheim |
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18 | * Germany |
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19 | * <rtems@embedded-brains.de> |
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20 | * |
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21 | * Copyright (c) 1997, 1998 Justin T. Gibbs. |
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22 | * All rights reserved. |
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23 | * |
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24 | * Redistribution and use in source and binary forms, with or without |
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25 | * modification, are permitted provided that the following conditions |
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26 | * are met: |
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27 | * 1. Redistributions of source code must retain the above copyright |
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28 | * notice, this list of conditions, and the following disclaimer, |
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29 | * without modification, immediately at the beginning of the file. |
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30 | * 2. The name of the author may not be used to endorse or promote products |
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31 | * derived from this software without specific prior written permission. |
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32 | * |
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33 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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34 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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35 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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36 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR |
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37 | * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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38 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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39 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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40 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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41 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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42 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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43 | * SUCH DAMAGE. |
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44 | */ |
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45 | |
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46 | #include <machine/rtems-bsd-kernel-space.h> |
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47 | #include <machine/rtems-bsd-bus-dma.h> |
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48 | |
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49 | #include <sys/mbuf.h> |
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50 | |
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51 | /* |
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52 | * Like bus_dmamap_load(), but for mbufs. |
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53 | */ |
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54 | int |
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55 | bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map, |
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56 | struct mbuf *m0, |
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57 | bus_dmamap_callback2_t *callback, void *callback_arg, |
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58 | int flags) |
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59 | { |
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60 | bus_dma_segment_t dm_segments[dmat->nsegments]; |
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61 | int nsegs, error; |
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62 | |
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63 | M_ASSERTPKTHDR(m0); |
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64 | |
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65 | flags |= BUS_DMA_NOWAIT; |
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66 | nsegs = 0; |
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67 | error = 0; |
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68 | if (m0->m_pkthdr.len <= dmat->maxsize) { |
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69 | int first = 1; |
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70 | bus_addr_t lastaddr = 0; |
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71 | struct mbuf *m; |
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72 | |
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73 | for (m = m0; m != NULL && error == 0; m = m->m_next) { |
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74 | if (m->m_len > 0) { |
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75 | error = bus_dmamap_load_buffer(dmat, dm_segments, |
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76 | m->m_data, m->m_len, |
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77 | NULL, flags, &lastaddr, |
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78 | &nsegs, first); |
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79 | first = 0; |
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80 | } |
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81 | } |
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82 | } else { |
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83 | error = EINVAL; |
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84 | } |
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85 | |
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86 | if (error) { |
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87 | /* force "no valid mappings" in callback */ |
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88 | (*callback)(callback_arg, dm_segments, 0, 0, error); |
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89 | } else { |
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90 | (*callback)(callback_arg, dm_segments, |
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91 | nsegs+1, m0->m_pkthdr.len, error); |
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92 | } |
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93 | return (error); |
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94 | } |
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95 | |
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96 | int |
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97 | bus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map, |
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98 | struct mbuf *m0, bus_dma_segment_t *segs, int *nsegs, |
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99 | int flags) |
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100 | { |
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101 | int error; |
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102 | |
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103 | M_ASSERTPKTHDR(m0); |
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104 | |
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105 | flags |= BUS_DMA_NOWAIT; |
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106 | *nsegs = 0; |
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107 | error = 0; |
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108 | if (m0->m_pkthdr.len <= dmat->maxsize) { |
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109 | int first = 1; |
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110 | bus_addr_t lastaddr = 0; |
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111 | struct mbuf *m; |
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112 | |
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113 | for (m = m0; m != NULL && error == 0; m = m->m_next) { |
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114 | if (m->m_len > 0) { |
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115 | error = bus_dmamap_load_buffer(dmat, segs, |
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116 | m->m_data, m->m_len, |
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117 | NULL, flags, &lastaddr, |
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118 | nsegs, first); |
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119 | first = 0; |
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120 | } |
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121 | } |
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122 | } else { |
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123 | error = EINVAL; |
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124 | } |
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125 | |
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126 | /* XXX FIXME: Having to increment nsegs is really annoying */ |
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127 | ++*nsegs; |
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128 | return (error); |
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129 | } |
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