Stephen Warren | 774fec3 | 2011-07-05 10:55:27 -0600 | [diff] [blame] | 1 | /* |
| 2 | * tegra_spdif.c - Tegra SPDIF driver |
| 3 | * |
| 4 | * Author: Stephen Warren <swarren@nvidia.com> |
| 5 | * Copyright (C) 2011 - NVIDIA, Inc. |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License |
| 9 | * version 2 as published by the Free Software Foundation. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, but |
| 12 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA |
| 19 | * 02110-1301 USA |
| 20 | * |
| 21 | */ |
| 22 | |
| 23 | #include <linux/clk.h> |
| 24 | #include <linux/module.h> |
| 25 | #include <linux/debugfs.h> |
| 26 | #include <linux/device.h> |
| 27 | #include <linux/platform_device.h> |
| 28 | #include <linux/seq_file.h> |
| 29 | #include <linux/slab.h> |
| 30 | #include <linux/io.h> |
| 31 | #include <mach/iomap.h> |
| 32 | #include <sound/core.h> |
| 33 | #include <sound/pcm.h> |
| 34 | #include <sound/pcm_params.h> |
| 35 | #include <sound/soc.h> |
| 36 | |
| 37 | #include "tegra_spdif.h" |
| 38 | |
| 39 | #define DRV_NAME "tegra-spdif" |
| 40 | |
| 41 | static inline void tegra_spdif_write(struct tegra_spdif *spdif, u32 reg, |
| 42 | u32 val) |
| 43 | { |
| 44 | __raw_writel(val, spdif->regs + reg); |
| 45 | } |
| 46 | |
| 47 | static inline u32 tegra_spdif_read(struct tegra_spdif *spdif, u32 reg) |
| 48 | { |
| 49 | return __raw_readl(spdif->regs + reg); |
| 50 | } |
| 51 | |
| 52 | #ifdef CONFIG_DEBUG_FS |
| 53 | static int tegra_spdif_show(struct seq_file *s, void *unused) |
| 54 | { |
| 55 | #define REG(r) { r, #r } |
| 56 | static const struct { |
| 57 | int offset; |
| 58 | const char *name; |
| 59 | } regs[] = { |
| 60 | REG(TEGRA_SPDIF_CTRL), |
| 61 | REG(TEGRA_SPDIF_STATUS), |
| 62 | REG(TEGRA_SPDIF_STROBE_CTRL), |
| 63 | REG(TEGRA_SPDIF_DATA_FIFO_CSR), |
| 64 | REG(TEGRA_SPDIF_CH_STA_RX_A), |
| 65 | REG(TEGRA_SPDIF_CH_STA_RX_B), |
| 66 | REG(TEGRA_SPDIF_CH_STA_RX_C), |
| 67 | REG(TEGRA_SPDIF_CH_STA_RX_D), |
| 68 | REG(TEGRA_SPDIF_CH_STA_RX_E), |
| 69 | REG(TEGRA_SPDIF_CH_STA_RX_F), |
| 70 | REG(TEGRA_SPDIF_CH_STA_TX_A), |
| 71 | REG(TEGRA_SPDIF_CH_STA_TX_B), |
| 72 | REG(TEGRA_SPDIF_CH_STA_TX_C), |
| 73 | REG(TEGRA_SPDIF_CH_STA_TX_D), |
| 74 | REG(TEGRA_SPDIF_CH_STA_TX_E), |
| 75 | REG(TEGRA_SPDIF_CH_STA_TX_F), |
| 76 | }; |
| 77 | #undef REG |
| 78 | |
| 79 | struct tegra_spdif *spdif = s->private; |
| 80 | int i; |
| 81 | |
| 82 | for (i = 0; i < ARRAY_SIZE(regs); i++) { |
| 83 | u32 val = tegra_spdif_read(spdif, regs[i].offset); |
| 84 | seq_printf(s, "%s = %08x\n", regs[i].name, val); |
| 85 | } |
| 86 | |
| 87 | return 0; |
| 88 | } |
| 89 | |
| 90 | static int tegra_spdif_debug_open(struct inode *inode, struct file *file) |
| 91 | { |
| 92 | return single_open(file, tegra_spdif_show, inode->i_private); |
| 93 | } |
| 94 | |
| 95 | static const struct file_operations tegra_spdif_debug_fops = { |
| 96 | .open = tegra_spdif_debug_open, |
| 97 | .read = seq_read, |
| 98 | .llseek = seq_lseek, |
| 99 | .release = single_release, |
| 100 | }; |
| 101 | |
| 102 | static void tegra_spdif_debug_add(struct tegra_spdif *spdif) |
| 103 | { |
| 104 | spdif->debug = debugfs_create_file(DRV_NAME, S_IRUGO, |
| 105 | snd_soc_debugfs_root, spdif, |
| 106 | &tegra_spdif_debug_fops); |
| 107 | } |
| 108 | |
| 109 | static void tegra_spdif_debug_remove(struct tegra_spdif *spdif) |
| 110 | { |
| 111 | if (spdif->debug) |
| 112 | debugfs_remove(spdif->debug); |
| 113 | } |
| 114 | #else |
| 115 | static inline void tegra_spdif_debug_add(struct tegra_spdif *spdif) |
| 116 | { |
| 117 | } |
| 118 | |
| 119 | static inline void tegra_spdif_debug_remove(struct tegra_spdif *spdif) |
| 120 | { |
| 121 | } |
| 122 | #endif |
| 123 | |
| 124 | static int tegra_spdif_hw_params(struct snd_pcm_substream *substream, |
| 125 | struct snd_pcm_hw_params *params, |
| 126 | struct snd_soc_dai *dai) |
| 127 | { |
| 128 | struct device *dev = substream->pcm->card->dev; |
| 129 | struct tegra_spdif *spdif = snd_soc_dai_get_drvdata(dai); |
| 130 | int ret, srate, spdifclock; |
| 131 | |
| 132 | spdif->reg_ctrl &= ~TEGRA_SPDIF_CTRL_PACK; |
| 133 | spdif->reg_ctrl &= ~TEGRA_SPDIF_CTRL_BIT_MODE_MASK; |
| 134 | switch (params_format(params)) { |
| 135 | case SNDRV_PCM_FORMAT_S16_LE: |
| 136 | spdif->reg_ctrl |= TEGRA_SPDIF_CTRL_PACK; |
| 137 | spdif->reg_ctrl |= TEGRA_SPDIF_CTRL_BIT_MODE_16BIT; |
| 138 | break; |
| 139 | default: |
| 140 | return -EINVAL; |
| 141 | } |
| 142 | |
| 143 | srate = params_rate(params); |
| 144 | switch (params_rate(params)) { |
| 145 | case 32000: |
| 146 | spdifclock = 4096000; |
| 147 | break; |
| 148 | case 44100: |
| 149 | spdifclock = 5644800; |
| 150 | break; |
| 151 | case 48000: |
| 152 | spdifclock = 6144000; |
| 153 | break; |
| 154 | case 88200: |
| 155 | spdifclock = 11289600; |
| 156 | break; |
| 157 | case 96000: |
| 158 | spdifclock = 12288000; |
| 159 | break; |
| 160 | case 176400: |
| 161 | spdifclock = 22579200; |
| 162 | break; |
| 163 | case 192000: |
| 164 | spdifclock = 24576000; |
| 165 | break; |
| 166 | default: |
| 167 | return -EINVAL; |
| 168 | } |
| 169 | |
| 170 | ret = clk_set_rate(spdif->clk_spdif_out, spdifclock); |
| 171 | if (ret) { |
| 172 | dev_err(dev, "Can't set SPDIF clock rate: %d\n", ret); |
| 173 | return ret; |
| 174 | } |
| 175 | |
| 176 | return 0; |
| 177 | } |
| 178 | |
| 179 | static void tegra_spdif_start_playback(struct tegra_spdif *spdif) |
| 180 | { |
| 181 | spdif->reg_ctrl |= TEGRA_SPDIF_CTRL_TX_EN; |
| 182 | tegra_spdif_write(spdif, TEGRA_SPDIF_CTRL, spdif->reg_ctrl); |
| 183 | } |
| 184 | |
| 185 | static void tegra_spdif_stop_playback(struct tegra_spdif *spdif) |
| 186 | { |
| 187 | spdif->reg_ctrl &= ~TEGRA_SPDIF_CTRL_TX_EN; |
| 188 | tegra_spdif_write(spdif, TEGRA_SPDIF_CTRL, spdif->reg_ctrl); |
| 189 | } |
| 190 | |
| 191 | static int tegra_spdif_trigger(struct snd_pcm_substream *substream, int cmd, |
| 192 | struct snd_soc_dai *dai) |
| 193 | { |
| 194 | struct tegra_spdif *spdif = snd_soc_dai_get_drvdata(dai); |
| 195 | |
| 196 | switch (cmd) { |
| 197 | case SNDRV_PCM_TRIGGER_START: |
| 198 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
| 199 | case SNDRV_PCM_TRIGGER_RESUME: |
| 200 | if (!spdif->clk_refs) |
| 201 | clk_enable(spdif->clk_spdif_out); |
| 202 | spdif->clk_refs++; |
| 203 | tegra_spdif_start_playback(spdif); |
| 204 | break; |
| 205 | case SNDRV_PCM_TRIGGER_STOP: |
| 206 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
| 207 | case SNDRV_PCM_TRIGGER_SUSPEND: |
| 208 | tegra_spdif_stop_playback(spdif); |
| 209 | spdif->clk_refs--; |
| 210 | if (!spdif->clk_refs) |
| 211 | clk_disable(spdif->clk_spdif_out); |
| 212 | break; |
| 213 | default: |
| 214 | return -EINVAL; |
| 215 | } |
| 216 | |
| 217 | return 0; |
| 218 | } |
| 219 | |
| 220 | static int tegra_spdif_probe(struct snd_soc_dai *dai) |
| 221 | { |
| 222 | struct tegra_spdif *spdif = snd_soc_dai_get_drvdata(dai); |
| 223 | |
| 224 | dai->capture_dma_data = NULL; |
| 225 | dai->playback_dma_data = &spdif->playback_dma_data; |
| 226 | |
| 227 | return 0; |
| 228 | } |
| 229 | |
| 230 | static struct snd_soc_dai_ops tegra_spdif_dai_ops = { |
| 231 | .hw_params = tegra_spdif_hw_params, |
| 232 | .trigger = tegra_spdif_trigger, |
| 233 | }; |
| 234 | |
| 235 | struct snd_soc_dai_driver tegra_spdif_dai = { |
| 236 | .name = DRV_NAME, |
| 237 | .probe = tegra_spdif_probe, |
| 238 | .playback = { |
| 239 | .channels_min = 2, |
| 240 | .channels_max = 2, |
| 241 | .rates = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | |
| 242 | SNDRV_PCM_RATE_48000, |
| 243 | .formats = SNDRV_PCM_FMTBIT_S16_LE, |
| 244 | }, |
| 245 | .ops = &tegra_spdif_dai_ops, |
| 246 | }; |
| 247 | |
| 248 | static __devinit int tegra_spdif_platform_probe(struct platform_device *pdev) |
| 249 | { |
| 250 | struct tegra_spdif *spdif; |
| 251 | struct resource *mem, *memregion, *dmareq; |
| 252 | int ret; |
| 253 | |
| 254 | spdif = kzalloc(sizeof(struct tegra_spdif), GFP_KERNEL); |
| 255 | if (!spdif) { |
| 256 | dev_err(&pdev->dev, "Can't allocate tegra_spdif\n"); |
| 257 | ret = -ENOMEM; |
| 258 | goto exit; |
| 259 | } |
| 260 | dev_set_drvdata(&pdev->dev, spdif); |
| 261 | |
| 262 | spdif->clk_spdif_out = clk_get(&pdev->dev, "spdif_out"); |
| 263 | if (IS_ERR(spdif->clk_spdif_out)) { |
| 264 | pr_err("Can't retrieve spdif clock\n"); |
| 265 | ret = PTR_ERR(spdif->clk_spdif_out); |
| 266 | goto err_free; |
| 267 | } |
| 268 | |
| 269 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 270 | if (!mem) { |
| 271 | dev_err(&pdev->dev, "No memory resource\n"); |
| 272 | ret = -ENODEV; |
| 273 | goto err_clk_put; |
| 274 | } |
| 275 | |
| 276 | dmareq = platform_get_resource(pdev, IORESOURCE_DMA, 0); |
| 277 | if (!dmareq) { |
| 278 | dev_err(&pdev->dev, "No DMA resource\n"); |
| 279 | ret = -ENODEV; |
| 280 | goto err_clk_put; |
| 281 | } |
| 282 | |
| 283 | memregion = request_mem_region(mem->start, resource_size(mem), |
| 284 | DRV_NAME); |
| 285 | if (!memregion) { |
| 286 | dev_err(&pdev->dev, "Memory region already claimed\n"); |
| 287 | ret = -EBUSY; |
| 288 | goto err_clk_put; |
| 289 | } |
| 290 | |
| 291 | spdif->regs = ioremap(mem->start, resource_size(mem)); |
| 292 | if (!spdif->regs) { |
| 293 | dev_err(&pdev->dev, "ioremap failed\n"); |
| 294 | ret = -ENOMEM; |
| 295 | goto err_release; |
| 296 | } |
| 297 | |
| 298 | spdif->playback_dma_data.addr = mem->start + TEGRA_SPDIF_DATA_OUT; |
| 299 | spdif->playback_dma_data.wrap = 4; |
| 300 | spdif->playback_dma_data.width = 32; |
| 301 | spdif->playback_dma_data.req_sel = dmareq->start; |
| 302 | |
| 303 | ret = snd_soc_register_dai(&pdev->dev, &tegra_spdif_dai); |
| 304 | if (ret) { |
| 305 | dev_err(&pdev->dev, "Could not register DAI: %d\n", ret); |
| 306 | ret = -ENOMEM; |
| 307 | goto err_unmap; |
| 308 | } |
| 309 | |
| 310 | tegra_spdif_debug_add(spdif); |
| 311 | |
| 312 | return 0; |
| 313 | |
| 314 | err_unmap: |
| 315 | iounmap(spdif->regs); |
| 316 | err_release: |
| 317 | release_mem_region(mem->start, resource_size(mem)); |
| 318 | err_clk_put: |
| 319 | clk_put(spdif->clk_spdif_out); |
| 320 | err_free: |
| 321 | kfree(spdif); |
| 322 | exit: |
| 323 | return ret; |
| 324 | } |
| 325 | |
| 326 | static int __devexit tegra_spdif_platform_remove(struct platform_device *pdev) |
| 327 | { |
| 328 | struct tegra_spdif *spdif = dev_get_drvdata(&pdev->dev); |
| 329 | struct resource *res; |
| 330 | |
| 331 | snd_soc_unregister_dai(&pdev->dev); |
| 332 | |
| 333 | tegra_spdif_debug_remove(spdif); |
| 334 | |
| 335 | iounmap(spdif->regs); |
| 336 | |
| 337 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 338 | release_mem_region(res->start, resource_size(res)); |
| 339 | |
| 340 | clk_put(spdif->clk_spdif_out); |
| 341 | |
| 342 | kfree(spdif); |
| 343 | |
| 344 | return 0; |
| 345 | } |
| 346 | |
| 347 | static struct platform_driver tegra_spdif_driver = { |
| 348 | .driver = { |
| 349 | .name = DRV_NAME, |
| 350 | .owner = THIS_MODULE, |
| 351 | }, |
| 352 | .probe = tegra_spdif_platform_probe, |
| 353 | .remove = __devexit_p(tegra_spdif_platform_remove), |
| 354 | }; |
| 355 | |
| 356 | static int __init snd_tegra_spdif_init(void) |
| 357 | { |
| 358 | return platform_driver_register(&tegra_spdif_driver); |
| 359 | } |
| 360 | module_init(snd_tegra_spdif_init); |
| 361 | |
| 362 | static void __exit snd_tegra_spdif_exit(void) |
| 363 | { |
| 364 | platform_driver_unregister(&tegra_spdif_driver); |
| 365 | } |
| 366 | module_exit(snd_tegra_spdif_exit); |
| 367 | |
| 368 | MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>"); |
| 369 | MODULE_DESCRIPTION("Tegra SPDIF ASoC driver"); |
| 370 | MODULE_LICENSE("GPL"); |
| 371 | MODULE_ALIAS("platform:" DRV_NAME); |