drivers/gpu/drm/radeon/r600_audio.c

   1 /*
   2  * Copyright 2008 Advanced Micro Devices, Inc.
   3  * Copyright 2008 Red Hat Inc.
   4  * Copyright 2009 Christian König.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * OTHER DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors: Christian König
  25  */
  26 #include "drmP.h"
  27 #include "radeon.h"
  28 #include "radeon_reg.h"
  29 #include "atom.h"
  30
  31 #define AUDIO_TIMER_INTERVALL 100 /* 1/10 sekund should be enough */
  32
  33 /*
  34  * check if the chipset is supported
  35  */
  36 static int r600_audio_chipset_supported(struct radeon_device *rdev)
  37 {
  38         return (rdev->family >= CHIP_R600 && rdev->family < CHIP_CEDAR)
  39                 || rdev->family == CHIP_RS600
  40                 || rdev->family == CHIP_RS690
  41                 || rdev->family == CHIP_RS740;
  42 }
  43
  44 /*
  45  * current number of channels
  46  */
  47 static int r600_audio_channels(struct radeon_device *rdev)
  48 {
  49         return (RREG32(R600_AUDIO_RATE_BPS_CHANNEL) & 0x7) + 1;
  50 }
  51
  52 /*
  53  * current bits per sample
  54  */
  55 static int r600_audio_bits_per_sample(struct radeon_device *rdev)
  56 {
  57         uint32_t value = (RREG32(R600_AUDIO_RATE_BPS_CHANNEL) & 0xF0) >> 4;
  58         switch (value) {
  59         case 0x0: return  8;
  60         case 0x1: return 16;
  61         case 0x2: return 20;
  62         case 0x3: return 24;
  63         case 0x4: return 32;
  64         }
  65
  66         DRM_ERROR("Unknown bits per sample 0x%x using 16 instead.\n", (int)value);
  67
  68         return 16;
  69 }
  70
  71 /*
  72  * current sampling rate in HZ
  73  */
  74 static int r600_audio_rate(struct radeon_device *rdev)
  75 {
  76         uint32_t value = RREG32(R600_AUDIO_RATE_BPS_CHANNEL);
  77         uint32_t result;
  78
  79         if (value & 0x4000)
  80                 result = 44100;
  81         else
  82                 result = 48000;
  83
  84         result *= ((value >> 11) & 0x7) + 1;
  85         result /= ((value >> 8) & 0x7) + 1;
  86
  87         return result;
  88 }
  89
  90 /*
  91  * iec 60958 status bits
  92  */
  93 static uint8_t r600_audio_status_bits(struct radeon_device *rdev)
  94 {
  95         return RREG32(R600_AUDIO_STATUS_BITS) & 0xff;
  96 }
  97
  98 /*
  99  * iec 60958 category code
 100  */
 101 static uint8_t r600_audio_category_code(struct radeon_device *rdev)
 102 {
 103         return (RREG32(R600_AUDIO_STATUS_BITS) >> 8) & 0xff;
 104 }
 105
 106 /*
 107  * update all hdmi interfaces with current audio parameters
 108  */
 109 static void r600_audio_update_hdmi(unsigned long param)
 110 {
 111         struct radeon_device *rdev = (struct radeon_device *)param;
 112         struct drm_device *dev = rdev->ddev;
 113
 114         int channels = r600_audio_channels(rdev);
 115         int rate = r600_audio_rate(rdev);
 116         int bps = r600_audio_bits_per_sample(rdev);
 117         uint8_t status_bits = r600_audio_status_bits(rdev);
 118         uint8_t category_code = r600_audio_category_code(rdev);
 119
 120         struct drm_encoder *encoder;
 121         int changes = 0;
 122
 123         changes |= channels != rdev->audio_channels;
 124         changes |= rate != rdev->audio_rate;
 125         changes |= bps != rdev->audio_bits_per_sample;
 126         changes |= status_bits != rdev->audio_status_bits;
 127         changes |= category_code != rdev->audio_category_code;
 128
 129         if (changes) {
 130                 rdev->audio_channels = channels;
 131                 rdev->audio_rate = rate;
 132                 rdev->audio_bits_per_sample = bps;
 133                 rdev->audio_status_bits = status_bits;
 134                 rdev->audio_category_code = category_code;
 135         }
 136
 137         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 138                 if (changes || r600_hdmi_buffer_status_changed(encoder))
 139                         r600_hdmi_update_audio_settings(
 140                                 encoder, channels,
 141                                 rate, bps, status_bits,
 142                                 category_code);
 143         }
 144
 145         mod_timer(&rdev->audio_timer,
 146                 jiffies + msecs_to_jiffies(AUDIO_TIMER_INTERVALL));
 147 }
 148
 149 /*
 150  * turn on/off audio engine
 151  */
 152 static void r600_audio_engine_enable(struct radeon_device *rdev, bool enable)
 153 {
 154         DRM_INFO("%s audio support", enable ? "Enabling" : "Disabling");
 155         WREG32_P(R600_AUDIO_ENABLE, enable ? 0x81000000 : 0x0, ~0x81000000);
 156 }
 157
 158 /*
 159  * initialize the audio vars and register the update timer
 160  */
 161 int r600_audio_init(struct radeon_device *rdev)
 162 {
 163         if (!radeon_audio || !r600_audio_chipset_supported(rdev))
 164                 return 0;
 165
 166         r600_audio_engine_enable(rdev, true);
 167
 168         rdev->audio_channels = -1;
 169         rdev->audio_rate = -1;
 170         rdev->audio_bits_per_sample = -1;
 171         rdev->audio_status_bits = 0;
 172         rdev->audio_category_code = 0;
 173
 174         setup_timer(
 175                 &rdev->audio_timer,
 176                 r600_audio_update_hdmi,
 177                 (unsigned long)rdev);
 178
 179         mod_timer(&rdev->audio_timer, jiffies + 1);
 180
 181         return 0;
 182 }
 183
 184 /*
 185  * atach the audio codec to the clock source of the encoder
 186  */
 187 void r600_audio_set_clock(struct drm_encoder *encoder, int clock)
 188 {
 189         struct drm_device *dev = encoder->dev;
 190         struct radeon_device *rdev = dev->dev_private;
 191         struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
 192         struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
 193         int base_rate = 48000;
 194
 195         switch (radeon_encoder->encoder_id) {
 196         case ENCODER_OBJECT_ID_INTERNAL_KLDSCP_TMDS1:
 197         case ENCODER_OBJECT_ID_INTERNAL_LVTM1:
 198                 WREG32_P(R600_AUDIO_TIMING, 0, ~0x301);
 199                 break;
 200         case ENCODER_OBJECT_ID_INTERNAL_UNIPHY:
 201         case ENCODER_OBJECT_ID_INTERNAL_UNIPHY1:
 202         case ENCODER_OBJECT_ID_INTERNAL_UNIPHY2:
 203         case ENCODER_OBJECT_ID_INTERNAL_KLDSCP_LVTMA:
 204                 WREG32_P(R600_AUDIO_TIMING, 0x100, ~0x301);
 205                 break;
 206         default:
 207                 DRM_ERROR("Unsupported encoder type 0x%02X\n",
 208                           radeon_encoder->encoder_id);
 209                 return;
 210         }
 211
 212         switch (dig->dig_encoder) {
 213         case 0:
 214                 WREG32(R600_AUDIO_PLL1_MUL, base_rate * 50);
 215                 WREG32(R600_AUDIO_PLL1_DIV, clock * 100);
 216                 WREG32(R600_AUDIO_CLK_SRCSEL, 0);
 217                 break;
 218
 219         case 1:
 220                 WREG32(R600_AUDIO_PLL2_MUL, base_rate * 50);
 221                 WREG32(R600_AUDIO_PLL2_DIV, clock * 100);
 222                 WREG32(R600_AUDIO_CLK_SRCSEL, 1);
 223                 break;
 224         default:
 225                 dev_err(rdev->dev, "Unsupported DIG on encoder 0x%02X\n",
 226                           radeon_encoder->encoder_id);
 227                 return;
 228         }
 229 }
 230
 231 /*
 232  * release the audio timer
 233  * TODO: How to do this correctly on SMP systems?
 234  */
 235 void r600_audio_fini(struct radeon_device *rdev)
 236 {
 237         if (!radeon_audio || !r600_audio_chipset_supported(rdev))
 238                 return;
 239
 240         del_timer(&rdev->audio_timer);
 241
 242         r600_audio_engine_enable(rdev, false);
 243 }