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 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 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         dev_err(rdev->dev, "Unknown bits per sample 0x%x using 16 instead\n",
  67                 (int)value);
  68
  69         return 16;
  70 }
  71
  72 /*
  73  * current sampling rate in HZ
  74  */
  75 int r600_audio_rate(struct radeon_device *rdev)
  76 {
  77         uint32_t value = RREG32(R600_AUDIO_RATE_BPS_CHANNEL);
  78         uint32_t result;
  79
  80         if (value & 0x4000)
  81                 result = 44100;
  82         else
  83                 result = 48000;
  84
  85         result *= ((value >> 11) & 0x7) + 1;
  86         result /= ((value >> 8) & 0x7) + 1;
  87
  88         return result;
  89 }
  90
  91 /*
  92  * iec 60958 status bits
  93  */
  94 uint8_t r600_audio_status_bits(struct radeon_device *rdev)
  95 {
  96         return RREG32(R600_AUDIO_STATUS_BITS) & 0xff;
  97 }
  98
  99 /*
 100  * iec 60958 category code
 101  */
 102 uint8_t r600_audio_category_code(struct radeon_device *rdev)
 103 {
 104         return (RREG32(R600_AUDIO_STATUS_BITS) >> 8) & 0xff;
 105 }
 106
 107 /*
 108  * schedule next audio update event
 109  */
 110 void r600_audio_schedule_polling(struct radeon_device *rdev)
 111 {
 112         mod_timer(&rdev->audio_timer,
 113                 jiffies + msecs_to_jiffies(AUDIO_TIMER_INTERVALL));
 114 }
 115
 116 /*
 117  * update all hdmi interfaces with current audio parameters
 118  */
 119 static void r600_audio_update_hdmi(unsigned long param)
 120 {
 121         struct radeon_device *rdev = (struct radeon_device *)param;
 122         struct drm_device *dev = rdev->ddev;
 123
 124         int channels = r600_audio_channels(rdev);
 125         int rate = r600_audio_rate(rdev);
 126         int bps = r600_audio_bits_per_sample(rdev);
 127         uint8_t status_bits = r600_audio_status_bits(rdev);
 128         uint8_t category_code = r600_audio_category_code(rdev);
 129
 130         struct drm_encoder *encoder;
 131         int changes = 0, still_going = 0;
 132
 133         changes |= channels != rdev->audio_channels;
 134         changes |= rate != rdev->audio_rate;
 135         changes |= bps != rdev->audio_bits_per_sample;
 136         changes |= status_bits != rdev->audio_status_bits;
 137         changes |= category_code != rdev->audio_category_code;
 138
 139         if (changes) {
 140                 rdev->audio_channels = channels;
 141                 rdev->audio_rate = rate;
 142                 rdev->audio_bits_per_sample = bps;
 143                 rdev->audio_status_bits = status_bits;
 144                 rdev->audio_category_code = category_code;
 145         }
 146
 147         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 148                 struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
 149                 still_going |= radeon_encoder->audio_polling_active;
 150                 if (changes || r600_hdmi_buffer_status_changed(encoder))
 151                         r600_hdmi_update_audio_settings(encoder);
 152         }
 153
 154         if (still_going)
 155                 r600_audio_schedule_polling(rdev);
 156 }
 157
 158 /*
 159  * turn on/off audio engine
 160  */
 161 static void r600_audio_engine_enable(struct radeon_device *rdev, bool enable)
 162 {
 163         DRM_INFO("%s audio support\n", enable ? "Enabling" : "Disabling");
 164         WREG32_P(R600_AUDIO_ENABLE, enable ? 0x81000000 : 0x0, ~0x81000000);
 165         rdev->audio_enabled = enable;
 166 }
 167
 168 /*
 169  * initialize the audio vars and register the update timer
 170  */
 171 int r600_audio_init(struct radeon_device *rdev)
 172 {
 173         if (!radeon_audio || !r600_audio_chipset_supported(rdev))
 174                 return 0;
 175
 176         r600_audio_engine_enable(rdev, true);
 177
 178         rdev->audio_channels = -1;
 179         rdev->audio_rate = -1;
 180         rdev->audio_bits_per_sample = -1;
 181         rdev->audio_status_bits = 0;
 182         rdev->audio_category_code = 0;
 183
 184         setup_timer(
 185                 &rdev->audio_timer,
 186                 r600_audio_update_hdmi,
 187                 (unsigned long)rdev);
 188
 189         return 0;
 190 }
 191
 192 /*
 193  * enable the polling timer, to check for status changes
 194  */
 195 void r600_audio_enable_polling(struct drm_encoder *encoder)
 196 {
 197         struct drm_device *dev = encoder->dev;
 198         struct radeon_device *rdev = dev->dev_private;
 199         struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
 200
 201         DRM_DEBUG("r600_audio_enable_polling: %d\n",
 202                 radeon_encoder->audio_polling_active);
 203         if (radeon_encoder->audio_polling_active)
 204                 return;
 205
 206         radeon_encoder->audio_polling_active = 1;
 207         if (rdev->audio_enabled)
 208                 mod_timer(&rdev->audio_timer, jiffies + 1);
 209 }
 210
 211 /*
 212  * disable the polling timer, so we get no more status updates
 213  */
 214 void r600_audio_disable_polling(struct drm_encoder *encoder)
 215 {
 216         struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
 217         DRM_DEBUG("r600_audio_disable_polling: %d\n",
 218                 radeon_encoder->audio_polling_active);
 219         radeon_encoder->audio_polling_active = 0;
 220 }
 221
 222 /*
 223  * atach the audio codec to the clock source of the encoder
 224  */
 225 void r600_audio_set_clock(struct drm_encoder *encoder, int clock)
 226 {
 227         struct drm_device *dev = encoder->dev;
 228         struct radeon_device *rdev = dev->dev_private;
 229         struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
 230         struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
 231         int base_rate = 48000;
 232
 233         switch (radeon_encoder->encoder_id) {
 234         case ENCODER_OBJECT_ID_INTERNAL_KLDSCP_TMDS1:
 235         case ENCODER_OBJECT_ID_INTERNAL_LVTM1:
 236                 WREG32_P(R600_AUDIO_TIMING, 0, ~0x301);
 237                 break;
 238         case ENCODER_OBJECT_ID_INTERNAL_UNIPHY:
 239         case ENCODER_OBJECT_ID_INTERNAL_UNIPHY1:
 240         case ENCODER_OBJECT_ID_INTERNAL_UNIPHY2:
 241         case ENCODER_OBJECT_ID_INTERNAL_KLDSCP_LVTMA:
 242                 WREG32_P(R600_AUDIO_TIMING, 0x100, ~0x301);
 243                 break;
 244         default:
 245                 dev_err(rdev->dev, "Unsupported encoder type 0x%02X\n",
 246                           radeon_encoder->encoder_id);
 247                 return;
 248         }
 249
 250         switch (dig->dig_encoder) {
 251         case 0:
 252                 WREG32(R600_AUDIO_PLL1_MUL, base_rate * 50);
 253                 WREG32(R600_AUDIO_PLL1_DIV, clock * 100);
 254                 WREG32(R600_AUDIO_CLK_SRCSEL, 0);
 255                 break;
 256
 257         case 1:
 258                 WREG32(R600_AUDIO_PLL2_MUL, base_rate * 50);
 259                 WREG32(R600_AUDIO_PLL2_DIV, clock * 100);
 260                 WREG32(R600_AUDIO_CLK_SRCSEL, 1);
 261                 break;
 262         default:
 263                 dev_err(rdev->dev, "Unsupported DIG on encoder 0x%02X\n",
 264                           radeon_encoder->encoder_id);
 265                 return;
 266         }
 267 }
 268
 269 /*
 270  * release the audio timer
 271  * TODO: How to do this correctly on SMP systems?
 272  */
 273 void r600_audio_fini(struct radeon_device *rdev)
 274 {
 275         if (!rdev->audio_enabled)
 276                 return;
 277
 278         del_timer(&rdev->audio_timer);
 279
 280         r600_audio_engine_enable(rdev, false);
 281 }