1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * tegra20_ac97.c - Tegra20 AC97 platform driver 4 * 5 * Copyright (c) 2012 Lucas Stach <dev@lynxeye.de> 6 * 7 * Partly based on code copyright/by: 8 * 9 * Copyright (c) 2011,2012 Toradex Inc. 10 */ 11 12 #include <linux/clk.h> 13 #include <linux/delay.h> 14 #include <linux/device.h> 15 #include <linux/gpio.h> 16 #include <linux/io.h> 17 #include <linux/jiffies.h> 18 #include <linux/module.h> 19 #include <linux/of.h> 20 #include <linux/of_gpio.h> 21 #include <linux/platform_device.h> 22 #include <linux/regmap.h> 23 #include <linux/reset.h> 24 #include <linux/slab.h> 25 #include <sound/core.h> 26 #include <sound/pcm.h> 27 #include <sound/pcm_params.h> 28 #include <sound/soc.h> 29 #include <sound/dmaengine_pcm.h> 30 31 #include "tegra20_ac97.h" 32 33 #define DRV_NAME "tegra20-ac97" 34 35 static struct tegra20_ac97 *workdata; 36 37 static void tegra20_ac97_codec_reset(struct snd_ac97 *ac97) 38 { 39 u32 readback; 40 unsigned long timeout; 41 42 /* reset line is not driven by DAC pad group, have to toggle GPIO */ 43 gpio_set_value(workdata->reset_gpio, 0); 44 udelay(2); 45 46 gpio_set_value(workdata->reset_gpio, 1); 47 udelay(2); 48 49 timeout = jiffies + msecs_to_jiffies(100); 50 51 do { 52 regmap_read(workdata->regmap, TEGRA20_AC97_STATUS1, &readback); 53 if (readback & TEGRA20_AC97_STATUS1_CODEC1_RDY) 54 break; 55 usleep_range(1000, 2000); 56 } while (!time_after(jiffies, timeout)); 57 } 58 59 static void tegra20_ac97_codec_warm_reset(struct snd_ac97 *ac97) 60 { 61 u32 readback; 62 unsigned long timeout; 63 64 /* 65 * although sync line is driven by the DAC pad group warm reset using 66 * the controller cmd is not working, have to toggle sync line 67 * manually. 68 */ 69 gpio_request(workdata->sync_gpio, "codec-sync"); 70 71 gpio_direction_output(workdata->sync_gpio, 1); 72 73 udelay(2); 74 gpio_set_value(workdata->sync_gpio, 0); 75 udelay(2); 76 gpio_free(workdata->sync_gpio); 77 78 timeout = jiffies + msecs_to_jiffies(100); 79 80 do { 81 regmap_read(workdata->regmap, TEGRA20_AC97_STATUS1, &readback); 82 if (readback & TEGRA20_AC97_STATUS1_CODEC1_RDY) 83 break; 84 usleep_range(1000, 2000); 85 } while (!time_after(jiffies, timeout)); 86 } 87 88 static unsigned short tegra20_ac97_codec_read(struct snd_ac97 *ac97_snd, 89 unsigned short reg) 90 { 91 u32 readback; 92 unsigned long timeout; 93 94 regmap_write(workdata->regmap, TEGRA20_AC97_CMD, 95 (((reg | 0x80) << TEGRA20_AC97_CMD_CMD_ADDR_SHIFT) & 96 TEGRA20_AC97_CMD_CMD_ADDR_MASK) | 97 TEGRA20_AC97_CMD_BUSY); 98 99 timeout = jiffies + msecs_to_jiffies(100); 100 101 do { 102 regmap_read(workdata->regmap, TEGRA20_AC97_STATUS1, &readback); 103 if (readback & TEGRA20_AC97_STATUS1_STA_VALID1) 104 break; 105 usleep_range(1000, 2000); 106 } while (!time_after(jiffies, timeout)); 107 108 return ((readback & TEGRA20_AC97_STATUS1_STA_DATA1_MASK) >> 109 TEGRA20_AC97_STATUS1_STA_DATA1_SHIFT); 110 } 111 112 static void tegra20_ac97_codec_write(struct snd_ac97 *ac97_snd, 113 unsigned short reg, unsigned short val) 114 { 115 u32 readback; 116 unsigned long timeout; 117 118 regmap_write(workdata->regmap, TEGRA20_AC97_CMD, 119 ((reg << TEGRA20_AC97_CMD_CMD_ADDR_SHIFT) & 120 TEGRA20_AC97_CMD_CMD_ADDR_MASK) | 121 ((val << TEGRA20_AC97_CMD_CMD_DATA_SHIFT) & 122 TEGRA20_AC97_CMD_CMD_DATA_MASK) | 123 TEGRA20_AC97_CMD_BUSY); 124 125 timeout = jiffies + msecs_to_jiffies(100); 126 127 do { 128 regmap_read(workdata->regmap, TEGRA20_AC97_CMD, &readback); 129 if (!(readback & TEGRA20_AC97_CMD_BUSY)) 130 break; 131 usleep_range(1000, 2000); 132 } while (!time_after(jiffies, timeout)); 133 } 134 135 static struct snd_ac97_bus_ops tegra20_ac97_ops = { 136 .read = tegra20_ac97_codec_read, 137 .write = tegra20_ac97_codec_write, 138 .reset = tegra20_ac97_codec_reset, 139 .warm_reset = tegra20_ac97_codec_warm_reset, 140 }; 141 142 static inline void tegra20_ac97_start_playback(struct tegra20_ac97 *ac97) 143 { 144 regmap_update_bits(ac97->regmap, TEGRA20_AC97_FIFO1_SCR, 145 TEGRA20_AC97_FIFO_SCR_PB_QRT_MT_EN, 146 TEGRA20_AC97_FIFO_SCR_PB_QRT_MT_EN); 147 148 regmap_update_bits(ac97->regmap, TEGRA20_AC97_CTRL, 149 TEGRA20_AC97_CTRL_PCM_DAC_EN | 150 TEGRA20_AC97_CTRL_STM_EN, 151 TEGRA20_AC97_CTRL_PCM_DAC_EN | 152 TEGRA20_AC97_CTRL_STM_EN); 153 } 154 155 static inline void tegra20_ac97_stop_playback(struct tegra20_ac97 *ac97) 156 { 157 regmap_update_bits(ac97->regmap, TEGRA20_AC97_FIFO1_SCR, 158 TEGRA20_AC97_FIFO_SCR_PB_QRT_MT_EN, 0); 159 160 regmap_update_bits(ac97->regmap, TEGRA20_AC97_CTRL, 161 TEGRA20_AC97_CTRL_PCM_DAC_EN, 0); 162 } 163 164 static inline void tegra20_ac97_start_capture(struct tegra20_ac97 *ac97) 165 { 166 regmap_update_bits(ac97->regmap, TEGRA20_AC97_FIFO1_SCR, 167 TEGRA20_AC97_FIFO_SCR_REC_FULL_EN, 168 TEGRA20_AC97_FIFO_SCR_REC_FULL_EN); 169 } 170 171 static inline void tegra20_ac97_stop_capture(struct tegra20_ac97 *ac97) 172 { 173 regmap_update_bits(ac97->regmap, TEGRA20_AC97_FIFO1_SCR, 174 TEGRA20_AC97_FIFO_SCR_REC_FULL_EN, 0); 175 } 176 177 static int tegra20_ac97_trigger(struct snd_pcm_substream *substream, int cmd, 178 struct snd_soc_dai *dai) 179 { 180 struct tegra20_ac97 *ac97 = snd_soc_dai_get_drvdata(dai); 181 182 switch (cmd) { 183 case SNDRV_PCM_TRIGGER_START: 184 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 185 case SNDRV_PCM_TRIGGER_RESUME: 186 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 187 tegra20_ac97_start_playback(ac97); 188 else 189 tegra20_ac97_start_capture(ac97); 190 break; 191 case SNDRV_PCM_TRIGGER_STOP: 192 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 193 case SNDRV_PCM_TRIGGER_SUSPEND: 194 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 195 tegra20_ac97_stop_playback(ac97); 196 else 197 tegra20_ac97_stop_capture(ac97); 198 break; 199 default: 200 return -EINVAL; 201 } 202 203 return 0; 204 } 205 206 static const struct snd_soc_dai_ops tegra20_ac97_dai_ops = { 207 .trigger = tegra20_ac97_trigger, 208 }; 209 210 static int tegra20_ac97_probe(struct snd_soc_dai *dai) 211 { 212 struct tegra20_ac97 *ac97 = snd_soc_dai_get_drvdata(dai); 213 214 snd_soc_dai_init_dma_data(dai, &ac97->playback_dma_data, 215 &ac97->capture_dma_data); 216 217 return 0; 218 } 219 220 static struct snd_soc_dai_driver tegra20_ac97_dai = { 221 .name = "tegra-ac97-pcm", 222 .probe = tegra20_ac97_probe, 223 .playback = { 224 .stream_name = "PCM Playback", 225 .channels_min = 2, 226 .channels_max = 2, 227 .rates = SNDRV_PCM_RATE_8000_48000, 228 .formats = SNDRV_PCM_FMTBIT_S16_LE, 229 }, 230 .capture = { 231 .stream_name = "PCM Capture", 232 .channels_min = 2, 233 .channels_max = 2, 234 .rates = SNDRV_PCM_RATE_8000_48000, 235 .formats = SNDRV_PCM_FMTBIT_S16_LE, 236 }, 237 .ops = &tegra20_ac97_dai_ops, 238 }; 239 240 static const struct snd_soc_component_driver tegra20_ac97_component = { 241 .name = DRV_NAME, 242 .legacy_dai_naming = 1, 243 }; 244 245 static bool tegra20_ac97_wr_rd_reg(struct device *dev, unsigned int reg) 246 { 247 switch (reg) { 248 case TEGRA20_AC97_CTRL: 249 case TEGRA20_AC97_CMD: 250 case TEGRA20_AC97_STATUS1: 251 case TEGRA20_AC97_FIFO1_SCR: 252 case TEGRA20_AC97_FIFO_TX1: 253 case TEGRA20_AC97_FIFO_RX1: 254 return true; 255 default: 256 break; 257 } 258 259 return false; 260 } 261 262 static bool tegra20_ac97_volatile_reg(struct device *dev, unsigned int reg) 263 { 264 switch (reg) { 265 case TEGRA20_AC97_STATUS1: 266 case TEGRA20_AC97_FIFO1_SCR: 267 case TEGRA20_AC97_FIFO_TX1: 268 case TEGRA20_AC97_FIFO_RX1: 269 return true; 270 default: 271 break; 272 } 273 274 return false; 275 } 276 277 static bool tegra20_ac97_precious_reg(struct device *dev, unsigned int reg) 278 { 279 switch (reg) { 280 case TEGRA20_AC97_FIFO_TX1: 281 case TEGRA20_AC97_FIFO_RX1: 282 return true; 283 default: 284 break; 285 } 286 287 return false; 288 } 289 290 static const struct regmap_config tegra20_ac97_regmap_config = { 291 .reg_bits = 32, 292 .reg_stride = 4, 293 .val_bits = 32, 294 .max_register = TEGRA20_AC97_FIFO_RX1, 295 .writeable_reg = tegra20_ac97_wr_rd_reg, 296 .readable_reg = tegra20_ac97_wr_rd_reg, 297 .volatile_reg = tegra20_ac97_volatile_reg, 298 .precious_reg = tegra20_ac97_precious_reg, 299 .cache_type = REGCACHE_FLAT, 300 }; 301 302 static int tegra20_ac97_platform_probe(struct platform_device *pdev) 303 { 304 struct tegra20_ac97 *ac97; 305 struct resource *mem; 306 void __iomem *regs; 307 int ret = 0; 308 309 ac97 = devm_kzalloc(&pdev->dev, sizeof(struct tegra20_ac97), 310 GFP_KERNEL); 311 if (!ac97) { 312 ret = -ENOMEM; 313 goto err; 314 } 315 dev_set_drvdata(&pdev->dev, ac97); 316 317 ac97->reset = devm_reset_control_get_exclusive(&pdev->dev, "ac97"); 318 if (IS_ERR(ac97->reset)) { 319 dev_err(&pdev->dev, "Can't retrieve ac97 reset\n"); 320 ret = PTR_ERR(ac97->reset); 321 goto err; 322 } 323 324 ac97->clk_ac97 = devm_clk_get(&pdev->dev, NULL); 325 if (IS_ERR(ac97->clk_ac97)) { 326 dev_err(&pdev->dev, "Can't retrieve ac97 clock\n"); 327 ret = PTR_ERR(ac97->clk_ac97); 328 goto err; 329 } 330 331 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 332 regs = devm_ioremap_resource(&pdev->dev, mem); 333 if (IS_ERR(regs)) { 334 ret = PTR_ERR(regs); 335 goto err_clk_put; 336 } 337 338 ac97->regmap = devm_regmap_init_mmio(&pdev->dev, regs, 339 &tegra20_ac97_regmap_config); 340 if (IS_ERR(ac97->regmap)) { 341 dev_err(&pdev->dev, "regmap init failed\n"); 342 ret = PTR_ERR(ac97->regmap); 343 goto err_clk_put; 344 } 345 346 ac97->reset_gpio = of_get_named_gpio(pdev->dev.of_node, 347 "nvidia,codec-reset-gpio", 0); 348 if (gpio_is_valid(ac97->reset_gpio)) { 349 ret = devm_gpio_request_one(&pdev->dev, ac97->reset_gpio, 350 GPIOF_OUT_INIT_HIGH, "codec-reset"); 351 if (ret) { 352 dev_err(&pdev->dev, "could not get codec-reset GPIO\n"); 353 goto err_clk_put; 354 } 355 } else { 356 dev_err(&pdev->dev, "no codec-reset GPIO supplied\n"); 357 ret = -EINVAL; 358 goto err_clk_put; 359 } 360 361 ac97->sync_gpio = of_get_named_gpio(pdev->dev.of_node, 362 "nvidia,codec-sync-gpio", 0); 363 if (!gpio_is_valid(ac97->sync_gpio)) { 364 dev_err(&pdev->dev, "no codec-sync GPIO supplied\n"); 365 ret = -EINVAL; 366 goto err_clk_put; 367 } 368 369 ac97->capture_dma_data.addr = mem->start + TEGRA20_AC97_FIFO_RX1; 370 ac97->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; 371 ac97->capture_dma_data.maxburst = 4; 372 373 ac97->playback_dma_data.addr = mem->start + TEGRA20_AC97_FIFO_TX1; 374 ac97->playback_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; 375 ac97->playback_dma_data.maxburst = 4; 376 377 ret = reset_control_assert(ac97->reset); 378 if (ret) { 379 dev_err(&pdev->dev, "Failed to assert AC'97 reset: %d\n", ret); 380 goto err_clk_put; 381 } 382 383 ret = clk_prepare_enable(ac97->clk_ac97); 384 if (ret) { 385 dev_err(&pdev->dev, "clk_enable failed: %d\n", ret); 386 goto err_clk_put; 387 } 388 389 usleep_range(10, 100); 390 391 ret = reset_control_deassert(ac97->reset); 392 if (ret) { 393 dev_err(&pdev->dev, "Failed to deassert AC'97 reset: %d\n", ret); 394 goto err_clk_disable_unprepare; 395 } 396 397 ret = snd_soc_set_ac97_ops(&tegra20_ac97_ops); 398 if (ret) { 399 dev_err(&pdev->dev, "Failed to set AC'97 ops: %d\n", ret); 400 goto err_clk_disable_unprepare; 401 } 402 403 ret = snd_soc_register_component(&pdev->dev, &tegra20_ac97_component, 404 &tegra20_ac97_dai, 1); 405 if (ret) { 406 dev_err(&pdev->dev, "Could not register DAI: %d\n", ret); 407 ret = -ENOMEM; 408 goto err_clk_disable_unprepare; 409 } 410 411 ret = tegra_pcm_platform_register(&pdev->dev); 412 if (ret) { 413 dev_err(&pdev->dev, "Could not register PCM: %d\n", ret); 414 goto err_unregister_component; 415 } 416 417 /* XXX: crufty ASoC AC97 API - only one AC97 codec allowed */ 418 workdata = ac97; 419 420 return 0; 421 422 err_unregister_component: 423 snd_soc_unregister_component(&pdev->dev); 424 err_clk_disable_unprepare: 425 clk_disable_unprepare(ac97->clk_ac97); 426 err_clk_put: 427 err: 428 snd_soc_set_ac97_ops(NULL); 429 return ret; 430 } 431 432 static void tegra20_ac97_platform_remove(struct platform_device *pdev) 433 { 434 struct tegra20_ac97 *ac97 = dev_get_drvdata(&pdev->dev); 435 436 tegra_pcm_platform_unregister(&pdev->dev); 437 snd_soc_unregister_component(&pdev->dev); 438 439 clk_disable_unprepare(ac97->clk_ac97); 440 441 snd_soc_set_ac97_ops(NULL); 442 } 443 444 static const struct of_device_id tegra20_ac97_of_match[] = { 445 { .compatible = "nvidia,tegra20-ac97", }, 446 {}, 447 }; 448 449 static struct platform_driver tegra20_ac97_driver = { 450 .driver = { 451 .name = DRV_NAME, 452 .of_match_table = tegra20_ac97_of_match, 453 }, 454 .probe = tegra20_ac97_platform_probe, 455 .remove_new = tegra20_ac97_platform_remove, 456 }; 457 module_platform_driver(tegra20_ac97_driver); 458 459 MODULE_AUTHOR("Lucas Stach"); 460 MODULE_DESCRIPTION("Tegra20 AC97 ASoC driver"); 461 MODULE_LICENSE("GPL v2"); 462 MODULE_ALIAS("platform:" DRV_NAME); 463 MODULE_DEVICE_TABLE(of, tegra20_ac97_of_match); 464