1 /* 2 * Au1000/Au1500/Au1100 AC97C controller driver for ASoC 3 * 4 * (c) 2011 Manuel Lauss <manuel.lauss@googlemail.com> 5 * 6 * based on the old ALSA driver originally written by 7 * Charles Eidsness <charles@cooper-street.com> 8 */ 9 10 #include <linux/init.h> 11 #include <linux/module.h> 12 #include <linux/slab.h> 13 #include <linux/device.h> 14 #include <linux/delay.h> 15 #include <linux/mutex.h> 16 #include <linux/platform_device.h> 17 #include <linux/suspend.h> 18 #include <sound/core.h> 19 #include <sound/pcm.h> 20 #include <sound/initval.h> 21 #include <sound/soc.h> 22 #include <asm/mach-au1x00/au1000.h> 23 24 #include "psc.h" 25 26 /* register offsets and bits */ 27 #define AC97_CONFIG 0x00 28 #define AC97_STATUS 0x04 29 #define AC97_DATA 0x08 30 #define AC97_CMDRESP 0x0c 31 #define AC97_ENABLE 0x10 32 33 #define CFG_RC(x) (((x) & 0x3ff) << 13) /* valid rx slots mask */ 34 #define CFG_XS(x) (((x) & 0x3ff) << 3) /* valid tx slots mask */ 35 #define CFG_SG (1 << 2) /* sync gate */ 36 #define CFG_SN (1 << 1) /* sync control */ 37 #define CFG_RS (1 << 0) /* acrst# control */ 38 #define STAT_XU (1 << 11) /* tx underflow */ 39 #define STAT_XO (1 << 10) /* tx overflow */ 40 #define STAT_RU (1 << 9) /* rx underflow */ 41 #define STAT_RO (1 << 8) /* rx overflow */ 42 #define STAT_RD (1 << 7) /* codec ready */ 43 #define STAT_CP (1 << 6) /* command pending */ 44 #define STAT_TE (1 << 4) /* tx fifo empty */ 45 #define STAT_TF (1 << 3) /* tx fifo full */ 46 #define STAT_RE (1 << 1) /* rx fifo empty */ 47 #define STAT_RF (1 << 0) /* rx fifo full */ 48 #define CMD_SET_DATA(x) (((x) & 0xffff) << 16) 49 #define CMD_GET_DATA(x) ((x) & 0xffff) 50 #define CMD_READ (1 << 7) 51 #define CMD_WRITE (0 << 7) 52 #define CMD_IDX(x) ((x) & 0x7f) 53 #define EN_D (1 << 1) /* DISable bit */ 54 #define EN_CE (1 << 0) /* clock enable bit */ 55 56 /* how often to retry failed codec register reads/writes */ 57 #define AC97_RW_RETRIES 5 58 59 #define AC97_RATES \ 60 SNDRV_PCM_RATE_CONTINUOUS 61 62 #define AC97_FMTS \ 63 (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE) 64 65 /* instance data. There can be only one, MacLeod!!!!, fortunately there IS only 66 * once AC97C on early Alchemy chips. The newer ones aren't so lucky. 67 */ 68 static struct au1xpsc_audio_data *ac97c_workdata; 69 #define ac97_to_ctx(x) ac97c_workdata 70 71 static inline unsigned long RD(struct au1xpsc_audio_data *ctx, int reg) 72 { 73 return __raw_readl(ctx->mmio + reg); 74 } 75 76 static inline void WR(struct au1xpsc_audio_data *ctx, int reg, unsigned long v) 77 { 78 __raw_writel(v, ctx->mmio + reg); 79 wmb(); 80 } 81 82 static unsigned short au1xac97c_ac97_read(struct snd_ac97 *ac97, 83 unsigned short r) 84 { 85 struct au1xpsc_audio_data *ctx = ac97_to_ctx(ac97); 86 unsigned int tmo, retry; 87 unsigned long data; 88 89 data = ~0; 90 retry = AC97_RW_RETRIES; 91 do { 92 mutex_lock(&ctx->lock); 93 94 tmo = 5; 95 while ((RD(ctx, AC97_STATUS) & STAT_CP) && tmo--) 96 udelay(21); /* wait an ac97 frame time */ 97 if (!tmo) { 98 pr_debug("ac97rd timeout #1\n"); 99 goto next; 100 } 101 102 WR(ctx, AC97_CMDRESP, CMD_IDX(r) | CMD_READ); 103 104 /* stupid errata: data is only valid for 21us, so 105 * poll, Forrest, poll... 106 */ 107 tmo = 0x10000; 108 while ((RD(ctx, AC97_STATUS) & STAT_CP) && tmo--) 109 asm volatile ("nop"); 110 data = RD(ctx, AC97_CMDRESP); 111 112 if (!tmo) 113 pr_debug("ac97rd timeout #2\n"); 114 115 next: 116 mutex_unlock(&ctx->lock); 117 } while (--retry && !tmo); 118 119 pr_debug("AC97RD %04x %04lx %d\n", r, data, retry); 120 121 return retry ? data & 0xffff : 0xffff; 122 } 123 124 static void au1xac97c_ac97_write(struct snd_ac97 *ac97, unsigned short r, 125 unsigned short v) 126 { 127 struct au1xpsc_audio_data *ctx = ac97_to_ctx(ac97); 128 unsigned int tmo, retry; 129 130 retry = AC97_RW_RETRIES; 131 do { 132 mutex_lock(&ctx->lock); 133 134 for (tmo = 5; (RD(ctx, AC97_STATUS) & STAT_CP) && tmo; tmo--) 135 udelay(21); 136 if (!tmo) { 137 pr_debug("ac97wr timeout #1\n"); 138 goto next; 139 } 140 141 WR(ctx, AC97_CMDRESP, CMD_WRITE | CMD_IDX(r) | CMD_SET_DATA(v)); 142 143 for (tmo = 10; (RD(ctx, AC97_STATUS) & STAT_CP) && tmo; tmo--) 144 udelay(21); 145 if (!tmo) 146 pr_debug("ac97wr timeout #2\n"); 147 next: 148 mutex_unlock(&ctx->lock); 149 } while (--retry && !tmo); 150 151 pr_debug("AC97WR %04x %04x %d\n", r, v, retry); 152 } 153 154 static void au1xac97c_ac97_warm_reset(struct snd_ac97 *ac97) 155 { 156 struct au1xpsc_audio_data *ctx = ac97_to_ctx(ac97); 157 158 WR(ctx, AC97_CONFIG, ctx->cfg | CFG_SG | CFG_SN); 159 msleep(20); 160 WR(ctx, AC97_CONFIG, ctx->cfg | CFG_SG); 161 WR(ctx, AC97_CONFIG, ctx->cfg); 162 } 163 164 static void au1xac97c_ac97_cold_reset(struct snd_ac97 *ac97) 165 { 166 struct au1xpsc_audio_data *ctx = ac97_to_ctx(ac97); 167 int i; 168 169 WR(ctx, AC97_CONFIG, ctx->cfg | CFG_RS); 170 msleep(500); 171 WR(ctx, AC97_CONFIG, ctx->cfg); 172 173 /* wait for codec ready */ 174 i = 50; 175 while (((RD(ctx, AC97_STATUS) & STAT_RD) == 0) && --i) 176 msleep(20); 177 if (!i) 178 printk(KERN_ERR "ac97c: codec not ready after cold reset\n"); 179 } 180 181 /* AC97 controller operations */ 182 struct snd_ac97_bus_ops soc_ac97_ops = { 183 .read = au1xac97c_ac97_read, 184 .write = au1xac97c_ac97_write, 185 .reset = au1xac97c_ac97_cold_reset, 186 .warm_reset = au1xac97c_ac97_warm_reset, 187 }; 188 EXPORT_SYMBOL_GPL(soc_ac97_ops); /* globals be gone! */ 189 190 static int alchemy_ac97c_startup(struct snd_pcm_substream *substream, 191 struct snd_soc_dai *dai) 192 { 193 struct au1xpsc_audio_data *ctx = snd_soc_dai_get_drvdata(dai); 194 snd_soc_dai_set_dma_data(dai, substream, &ctx->dmaids[0]); 195 return 0; 196 } 197 198 static struct snd_soc_dai_ops alchemy_ac97c_ops = { 199 .startup = alchemy_ac97c_startup, 200 }; 201 202 static int au1xac97c_dai_probe(struct snd_soc_dai *dai) 203 { 204 return ac97c_workdata ? 0 : -ENODEV; 205 } 206 207 static struct snd_soc_dai_driver au1xac97c_dai_driver = { 208 .name = "alchemy-ac97c", 209 .ac97_control = 1, 210 .probe = au1xac97c_dai_probe, 211 .playback = { 212 .rates = AC97_RATES, 213 .formats = AC97_FMTS, 214 .channels_min = 2, 215 .channels_max = 2, 216 }, 217 .capture = { 218 .rates = AC97_RATES, 219 .formats = AC97_FMTS, 220 .channels_min = 2, 221 .channels_max = 2, 222 }, 223 .ops = &alchemy_ac97c_ops, 224 }; 225 226 static int __devinit au1xac97c_drvprobe(struct platform_device *pdev) 227 { 228 int ret; 229 struct resource *iores, *dmares; 230 struct au1xpsc_audio_data *ctx; 231 232 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); 233 if (!ctx) 234 return -ENOMEM; 235 236 mutex_init(&ctx->lock); 237 238 iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); 239 if (!iores) { 240 ret = -ENODEV; 241 goto out0; 242 } 243 244 ret = -EBUSY; 245 if (!request_mem_region(iores->start, resource_size(iores), 246 pdev->name)) 247 goto out0; 248 249 ctx->mmio = ioremap_nocache(iores->start, resource_size(iores)); 250 if (!ctx->mmio) 251 goto out1; 252 253 dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0); 254 if (!dmares) 255 goto out2; 256 ctx->dmaids[SNDRV_PCM_STREAM_PLAYBACK] = dmares->start; 257 258 dmares = platform_get_resource(pdev, IORESOURCE_DMA, 1); 259 if (!dmares) 260 goto out2; 261 ctx->dmaids[SNDRV_PCM_STREAM_CAPTURE] = dmares->start; 262 263 /* switch it on */ 264 WR(ctx, AC97_ENABLE, EN_D | EN_CE); 265 WR(ctx, AC97_ENABLE, EN_CE); 266 267 ctx->cfg = CFG_RC(3) | CFG_XS(3); 268 WR(ctx, AC97_CONFIG, ctx->cfg); 269 270 platform_set_drvdata(pdev, ctx); 271 272 ret = snd_soc_register_dai(&pdev->dev, &au1xac97c_dai_driver); 273 if (ret) 274 goto out2; 275 276 ac97c_workdata = ctx; 277 return 0; 278 279 out2: 280 iounmap(ctx->mmio); 281 out1: 282 release_mem_region(iores->start, resource_size(iores)); 283 out0: 284 kfree(ctx); 285 return ret; 286 } 287 288 static int __devexit au1xac97c_drvremove(struct platform_device *pdev) 289 { 290 struct au1xpsc_audio_data *ctx = platform_get_drvdata(pdev); 291 struct resource *r = platform_get_resource(pdev, IORESOURCE_MEM, 0); 292 293 snd_soc_unregister_dai(&pdev->dev); 294 295 WR(ctx, AC97_ENABLE, EN_D); /* clock off, disable */ 296 297 iounmap(ctx->mmio); 298 release_mem_region(r->start, resource_size(r)); 299 kfree(ctx); 300 301 ac97c_workdata = NULL; /* MDEV */ 302 303 return 0; 304 } 305 306 #ifdef CONFIG_PM 307 static int au1xac97c_drvsuspend(struct device *dev) 308 { 309 struct au1xpsc_audio_data *ctx = dev_get_drvdata(dev); 310 311 WR(ctx, AC97_ENABLE, EN_D); /* clock off, disable */ 312 313 return 0; 314 } 315 316 static int au1xac97c_drvresume(struct device *dev) 317 { 318 struct au1xpsc_audio_data *ctx = dev_get_drvdata(dev); 319 320 WR(ctx, AC97_ENABLE, EN_D | EN_CE); 321 WR(ctx, AC97_ENABLE, EN_CE); 322 WR(ctx, AC97_CONFIG, ctx->cfg); 323 324 return 0; 325 } 326 327 static const struct dev_pm_ops au1xpscac97_pmops = { 328 .suspend = au1xac97c_drvsuspend, 329 .resume = au1xac97c_drvresume, 330 }; 331 332 #define AU1XPSCAC97_PMOPS (&au1xpscac97_pmops) 333 334 #else 335 336 #define AU1XPSCAC97_PMOPS NULL 337 338 #endif 339 340 static struct platform_driver au1xac97c_driver = { 341 .driver = { 342 .name = "alchemy-ac97c", 343 .owner = THIS_MODULE, 344 .pm = AU1XPSCAC97_PMOPS, 345 }, 346 .probe = au1xac97c_drvprobe, 347 .remove = __devexit_p(au1xac97c_drvremove), 348 }; 349 350 static int __init au1xac97c_load(void) 351 { 352 ac97c_workdata = NULL; 353 return platform_driver_register(&au1xac97c_driver); 354 } 355 356 static void __exit au1xac97c_unload(void) 357 { 358 platform_driver_unregister(&au1xac97c_driver); 359 } 360 361 module_init(au1xac97c_load); 362 module_exit(au1xac97c_unload); 363 364 MODULE_LICENSE("GPL"); 365 MODULE_DESCRIPTION("Au1000/1500/1100 AC97C ASoC driver"); 366 MODULE_AUTHOR("Manuel Lauss"); 367