1 | /* ac97.c |
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2 | * |
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3 | * Sound driver for Milkymist SoC |
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4 | * |
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5 | * The license and distribution terms for this file may be |
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6 | * found in the file LICENSE in this distribution or at |
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7 | * http://www.rtems.com/license/LICENSE. |
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8 | * |
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9 | * $Id$ |
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10 | * |
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11 | * COPYRIGHT (c) 2010, 2011 Sebastien Bourdeauducq |
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12 | */ |
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13 | |
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14 | #define RTEMS_STATUS_CHECKS_USE_PRINTK |
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15 | |
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16 | #include <rtems.h> |
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17 | #include <bsp.h> |
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18 | #include <bsp/irq-generic.h> |
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19 | #include <rtems/libio.h> |
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20 | #include <rtems/status-checks.h> |
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21 | #include "../include/system_conf.h" |
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22 | #include "milkymist_ac97.h" |
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23 | |
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24 | #define SND_DEVICE_NAME "/dev/snd" |
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25 | #define MIXER_DEVICE_NAME "/dev/mixer" |
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26 | |
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27 | static rtems_id cr_write_sem; |
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28 | static rtems_id cr_read_sem; |
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29 | |
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30 | static rtems_isr crrequest_handler(rtems_vector_number n) |
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31 | { |
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32 | rtems_semaphore_release(cr_write_sem); |
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33 | lm32_interrupt_ack(1 << MM_IRQ_AC97CRREQUEST); |
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34 | } |
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35 | |
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36 | static rtems_isr crreply_handler(rtems_vector_number n) |
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37 | { |
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38 | rtems_semaphore_release(cr_read_sem); |
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39 | lm32_interrupt_ack(1 << MM_IRQ_AC97CRREPLY); |
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40 | } |
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41 | |
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42 | /* queued playback buffers */ |
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43 | #define PLAY_Q_SIZE 8 |
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44 | #define PLAY_Q_MASK (PLAY_Q_SIZE-1) |
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45 | |
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46 | static struct snd_buffer *play_q[PLAY_Q_SIZE]; |
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47 | static int play_produce; |
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48 | static int play_consume; |
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49 | static int play_level; |
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50 | |
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51 | /* buffers played, for application to collect */ |
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52 | static rtems_id play_q_done; |
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53 | |
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54 | static void play_start(struct snd_buffer *buf) |
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55 | { |
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56 | if (buf->nsamples > (AC97_MAX_DMASIZE/4)) |
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57 | buf->nsamples = AC97_MAX_DMASIZE/4; |
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58 | |
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59 | MM_WRITE(MM_AC97_DADDRESS, (unsigned int)buf->samples); |
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60 | MM_WRITE(MM_AC97_DREMAINING, buf->nsamples*4); |
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61 | MM_WRITE(MM_AC97_DCTL, AC97_SCTL_EN); |
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62 | } |
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63 | |
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64 | static rtems_isr pcmplay_handler(rtems_vector_number n) |
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65 | { |
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66 | lm32_interrupt_ack(1 << MM_IRQ_AC97DMAR); |
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67 | |
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68 | rtems_message_queue_send(play_q_done, &play_q[play_consume], |
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69 | sizeof(void *)); |
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70 | |
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71 | play_consume = (play_consume + 1) & PLAY_Q_MASK; |
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72 | play_level--; |
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73 | |
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74 | if(play_level > 0) |
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75 | play_start(play_q[play_consume]); |
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76 | else |
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77 | MM_WRITE(MM_AC97_DCTL, 0); |
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78 | } |
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79 | |
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80 | /* queued record buffers */ |
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81 | #define RECORD_Q_SIZE 8 |
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82 | #define RECORD_Q_MASK (RECORD_Q_SIZE-1) |
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83 | |
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84 | static struct snd_buffer *record_q[RECORD_Q_SIZE]; |
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85 | static int record_produce; |
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86 | static int record_consume; |
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87 | static int record_level; |
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88 | |
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89 | /* buffers recorded, for application to collect */ |
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90 | static rtems_id record_q_done; |
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91 | |
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92 | static void record_start(struct snd_buffer *buf) |
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93 | { |
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94 | if (buf->nsamples > (AC97_MAX_DMASIZE/4)) |
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95 | buf->nsamples = AC97_MAX_DMASIZE/4; |
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96 | |
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97 | MM_WRITE(MM_AC97_UADDRESS, (unsigned int)buf->samples); |
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98 | MM_WRITE(MM_AC97_UREMAINING, buf->nsamples*4); |
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99 | MM_WRITE(MM_AC97_UCTL, AC97_SCTL_EN); |
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100 | } |
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101 | |
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102 | static rtems_isr pcmrecord_handler(rtems_vector_number n) |
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103 | { |
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104 | lm32_interrupt_ack(1 << MM_IRQ_AC97DMAW); |
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105 | |
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106 | __asm__ volatile( /* Invalidate Level-1 data cache */ |
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107 | "wcsr DCC, r0\n" |
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108 | "nop\n" |
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109 | ); |
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110 | |
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111 | rtems_message_queue_send(record_q_done, &record_q[record_consume], |
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112 | sizeof(void *)); |
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113 | |
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114 | record_consume = (record_consume + 1) & RECORD_Q_MASK; |
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115 | record_level--; |
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116 | |
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117 | if(record_level > 0) |
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118 | record_start(record_q[record_consume]); |
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119 | else |
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120 | MM_WRITE(MM_AC97_UCTL, 0); |
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121 | } |
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122 | |
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123 | rtems_device_driver ac97_initialize( |
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124 | rtems_device_major_number major, |
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125 | rtems_device_minor_number minor, |
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126 | void *arg |
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127 | ) |
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128 | { |
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129 | rtems_status_code sc; |
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130 | rtems_isr_entry dummy; |
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131 | |
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132 | sc = rtems_io_register_name(SND_DEVICE_NAME, major, 0); |
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133 | RTEMS_CHECK_SC(sc, "create snd device"); |
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134 | |
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135 | sc = rtems_io_register_name(MIXER_DEVICE_NAME, major, 1); |
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136 | RTEMS_CHECK_SC(sc, "create mixer device"); |
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137 | |
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138 | sc = rtems_semaphore_create( |
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139 | rtems_build_name('C', 'R', 'W', 'S'), |
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140 | 0, |
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141 | RTEMS_SIMPLE_BINARY_SEMAPHORE, |
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142 | 0, |
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143 | &cr_write_sem |
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144 | ); |
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145 | RTEMS_CHECK_SC(sc, "create AC97 register write semaphore"); |
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146 | |
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147 | sc = rtems_semaphore_create( |
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148 | rtems_build_name('C', 'R', 'R', 'S'), |
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149 | 0, |
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150 | RTEMS_SIMPLE_BINARY_SEMAPHORE, |
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151 | 0, |
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152 | &cr_read_sem |
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153 | ); |
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154 | RTEMS_CHECK_SC(sc, "create AC97 register read semaphore"); |
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155 | |
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156 | sc = rtems_message_queue_create( |
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157 | rtems_build_name('P', 'L', 'Y', 'Q'), |
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158 | PLAY_Q_SIZE*2, |
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159 | sizeof(void *), |
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160 | 0, |
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161 | &play_q_done |
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162 | ); |
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163 | RTEMS_CHECK_SC(sc, "create playback done queue"); |
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164 | |
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165 | sc = rtems_message_queue_create( |
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166 | rtems_build_name('R', 'E', 'C', 'Q'), |
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167 | RECORD_Q_SIZE*2, |
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168 | sizeof(void *), |
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169 | 0, |
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170 | &record_q_done |
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171 | ); |
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172 | RTEMS_CHECK_SC(sc, "create record done queue"); |
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173 | |
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174 | rtems_interrupt_catch(crrequest_handler, MM_IRQ_AC97CRREQUEST, &dummy); |
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175 | rtems_interrupt_catch(crreply_handler, MM_IRQ_AC97CRREPLY, &dummy); |
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176 | rtems_interrupt_catch(pcmplay_handler, MM_IRQ_AC97DMAR, &dummy); |
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177 | rtems_interrupt_catch(pcmrecord_handler, MM_IRQ_AC97DMAW, &dummy); |
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178 | bsp_interrupt_vector_enable(MM_IRQ_AC97CRREQUEST); |
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179 | bsp_interrupt_vector_enable(MM_IRQ_AC97CRREPLY); |
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180 | bsp_interrupt_vector_enable(MM_IRQ_AC97DMAR); |
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181 | bsp_interrupt_vector_enable(MM_IRQ_AC97DMAW); |
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182 | |
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183 | play_produce = 0; |
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184 | play_consume = 0; |
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185 | play_level = 0; |
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186 | |
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187 | record_produce = 0; |
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188 | record_consume = 0; |
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189 | record_level = 0; |
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190 | |
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191 | return RTEMS_SUCCESSFUL; |
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192 | } |
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193 | |
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194 | static rtems_status_code submit_play(struct snd_buffer *buf) |
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195 | { |
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196 | bsp_interrupt_vector_disable(MM_IRQ_AC97DMAR); |
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197 | if (play_level == PLAY_Q_SIZE) { |
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198 | bsp_interrupt_vector_enable(MM_IRQ_AC97DMAR); |
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199 | return RTEMS_UNSATISFIED; |
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200 | } |
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201 | play_q[play_produce] = buf; |
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202 | play_produce = (play_produce + 1) & PLAY_Q_MASK; |
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203 | play_level++; |
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204 | |
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205 | if (play_level == 1) |
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206 | play_start(buf); |
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207 | |
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208 | bsp_interrupt_vector_enable(MM_IRQ_AC97DMAR); |
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209 | return RTEMS_SUCCESSFUL; |
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210 | } |
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211 | |
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212 | static rtems_status_code collect_play(struct snd_buffer **buf) |
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213 | { |
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214 | size_t s; |
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215 | |
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216 | return rtems_message_queue_receive( |
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217 | play_q_done, |
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218 | buf, |
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219 | &s, |
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220 | RTEMS_WAIT, |
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221 | RTEMS_NO_TIMEOUT |
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222 | ); |
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223 | } |
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224 | |
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225 | static rtems_status_code submit_record(struct snd_buffer *buf) |
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226 | { |
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227 | bsp_interrupt_vector_disable(MM_IRQ_AC97DMAW); |
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228 | if (record_level == RECORD_Q_SIZE) { |
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229 | bsp_interrupt_vector_enable(MM_IRQ_AC97DMAW); |
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230 | return RTEMS_UNSATISFIED; |
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231 | } |
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232 | record_q[record_produce] = buf; |
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233 | record_produce = (record_produce + 1) & RECORD_Q_MASK; |
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234 | record_level++; |
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235 | |
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236 | if (record_level == 1) |
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237 | record_start(buf); |
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238 | |
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239 | bsp_interrupt_vector_enable(MM_IRQ_AC97DMAW); |
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240 | return RTEMS_SUCCESSFUL; |
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241 | } |
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242 | |
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243 | static rtems_status_code collect_record(struct snd_buffer **buf) |
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244 | { |
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245 | size_t s; |
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246 | |
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247 | return rtems_message_queue_receive( |
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248 | record_q_done, |
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249 | buf, |
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250 | &s, |
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251 | RTEMS_WAIT, |
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252 | RTEMS_NO_TIMEOUT |
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253 | ); |
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254 | } |
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255 | |
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256 | #define CR_TIMEOUT 10 |
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257 | |
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258 | static int read_cr(unsigned int adr) |
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259 | { |
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260 | rtems_status_code sc; |
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261 | |
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262 | MM_WRITE(MM_AC97_CRADDR, adr); |
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263 | MM_WRITE(MM_AC97_CRCTL, AC97_CRCTL_RQEN); |
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264 | sc = rtems_semaphore_obtain(cr_write_sem, RTEMS_WAIT, CR_TIMEOUT); |
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265 | if (sc != RTEMS_SUCCESSFUL) |
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266 | return -1; |
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267 | sc = rtems_semaphore_obtain(cr_read_sem, RTEMS_WAIT, CR_TIMEOUT); |
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268 | if (sc != RTEMS_SUCCESSFUL) |
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269 | return -1; |
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270 | return MM_READ(MM_AC97_CRDATAIN); |
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271 | } |
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272 | |
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273 | static int write_cr(unsigned int adr, unsigned int val) |
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274 | { |
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275 | rtems_status_code sc; |
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276 | |
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277 | MM_WRITE(MM_AC97_CRADDR, adr); |
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278 | MM_WRITE(MM_AC97_CRDATAOUT, val); |
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279 | MM_WRITE(MM_AC97_CRCTL, AC97_CRCTL_RQEN|AC97_CRCTL_WRITE); |
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280 | sc = rtems_semaphore_obtain(cr_write_sem, RTEMS_WAIT, CR_TIMEOUT); |
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281 | if (sc != RTEMS_SUCCESSFUL) |
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282 | return 0; |
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283 | return 1; |
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284 | } |
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285 | |
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286 | rtems_device_driver ac97_open( |
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287 | rtems_device_major_number major, |
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288 | rtems_device_minor_number minor, |
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289 | void *arg |
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290 | ) |
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291 | { |
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292 | int codec_id; |
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293 | |
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294 | if (minor == 0) { |
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295 | /* snd */ |
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296 | return RTEMS_SUCCESSFUL; |
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297 | } else { |
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298 | /* mixer */ |
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299 | codec_id = read_cr(0x00); |
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300 | if ((codec_id != 0x0d50) && (codec_id != 0x6150)) { |
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301 | printk("AC97 codec detection failed\n"); |
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302 | return RTEMS_UNSATISFIED; |
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303 | } |
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304 | write_cr(0x02, 0x0000); /* master volume */ |
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305 | write_cr(0x04, 0x0f0f); /* headphones volume */ |
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306 | write_cr(0x18, 0x0000); /* PCM out volume */ |
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307 | write_cr(0x1c, 0x0f0f); /* record gain */ |
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308 | |
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309 | write_cr(0x1a, 0x0505); /* record select: stereo mix */ |
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310 | |
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311 | return RTEMS_SUCCESSFUL; |
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312 | } |
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313 | } |
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314 | |
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315 | static rtems_status_code ioctl_read_channel(void *buf, |
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316 | unsigned int chan, int mono) |
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317 | { |
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318 | unsigned int *val = (unsigned int *)buf; |
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319 | int codec; |
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320 | int left, right; |
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321 | |
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322 | codec = read_cr(chan); |
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323 | if (codec < 0) |
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324 | return RTEMS_UNSATISFIED; |
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325 | if (codec & 0x8000) { |
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326 | /* muted */ |
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327 | *val = 0; |
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328 | return RTEMS_SUCCESSFUL; |
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329 | } |
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330 | if (mono) { |
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331 | right = left = 100-(((codec & 0x1f) + 1)*100)/32; |
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332 | } else { |
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333 | right = 100-(((codec & 0x1f) + 1)*100)/32; |
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334 | left = 100-((((codec & 0x1f00) >> 8) + 1)*100)/32; |
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335 | } |
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336 | *val = left | (right << 8); |
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337 | return RTEMS_SUCCESSFUL; |
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338 | } |
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339 | |
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340 | static rtems_status_code ioctl_write_channel(void *buf, |
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341 | unsigned int chan, int mono) |
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342 | { |
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343 | unsigned int *val = (unsigned int *)buf; |
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344 | int left, right; |
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345 | int codec; |
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346 | rtems_status_code sc; |
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347 | |
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348 | left = *val & 0xff; |
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349 | left = (left*32)/100 - 1; |
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350 | if(left < 0) |
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351 | left = 0; |
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352 | |
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353 | if (mono) |
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354 | right = 31; |
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355 | else { |
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356 | right = (*val >> 8) & 0xff; |
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357 | right = (right*32)/100 - 1; |
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358 | if(right < 0) |
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359 | right = 0; |
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360 | } |
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361 | |
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362 | if ((left == 0) && (right == 0)) |
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363 | /* mute */ |
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364 | codec = 0x8000; |
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365 | else |
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366 | codec = (31-left) | ((31-right) << 8); |
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367 | |
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368 | if (!write_cr(chan, codec)) |
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369 | sc = RTEMS_UNSATISFIED; |
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370 | else |
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371 | sc = RTEMS_SUCCESSFUL; |
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372 | return sc; |
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373 | } |
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374 | |
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375 | rtems_device_driver ac97_control( |
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376 | rtems_device_major_number major, |
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377 | rtems_device_minor_number minor, |
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378 | void *arg |
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379 | ) |
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380 | { |
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381 | rtems_libio_ioctl_args_t *args = arg; |
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382 | rtems_status_code sc; |
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383 | |
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384 | args->ioctl_return = -1; |
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385 | if(minor == 0) { |
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386 | /* dsp */ |
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387 | switch (args->command) { |
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388 | case SOUND_SND_SUBMIT_PLAY: |
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389 | return submit_play((struct snd_buffer *)args->buffer); |
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390 | case SOUND_SND_COLLECT_PLAY: |
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391 | return collect_play((struct snd_buffer **)args->buffer); |
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392 | case SOUND_SND_SUBMIT_RECORD: |
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393 | return submit_record((struct snd_buffer *)args->buffer); |
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394 | case SOUND_SND_COLLECT_RECORD: |
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395 | return collect_record((struct snd_buffer **)args->buffer); |
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396 | default: |
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397 | return RTEMS_UNSATISFIED; |
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398 | } |
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399 | } else { |
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400 | /* mixer */ |
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401 | switch (args->command) { |
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402 | case SOUND_MIXER_READ(SOUND_MIXER_MIC): |
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403 | sc = ioctl_read_channel(args->buffer, 0x0e, 1); |
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404 | if(sc == RTEMS_SUCCESSFUL) |
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405 | args->ioctl_return = 0; |
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406 | return sc; |
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407 | case SOUND_MIXER_READ(SOUND_MIXER_LINE): |
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408 | sc = ioctl_read_channel(args->buffer, 0x10, 0); |
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409 | if(sc == RTEMS_SUCCESSFUL) |
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410 | args->ioctl_return = 0; |
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411 | return sc; |
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412 | case SOUND_MIXER_WRITE(SOUND_MIXER_MIC): |
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413 | sc = ioctl_write_channel(args->buffer, 0x0e, 1); |
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414 | if(sc == RTEMS_SUCCESSFUL) |
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415 | args->ioctl_return = 0; |
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416 | return sc; |
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417 | case SOUND_MIXER_WRITE(SOUND_MIXER_LINE): |
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418 | sc = ioctl_write_channel(args->buffer, 0x10, 0); |
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419 | if(sc == RTEMS_SUCCESSFUL) |
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420 | args->ioctl_return = 0; |
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421 | return sc; |
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422 | default: |
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423 | return RTEMS_UNSATISFIED; |
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424 | } |
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425 | } |
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426 | } |
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