1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Au1000/Au1500/Au1100 AC97C controller driver for ASoC 4 * 5 * (c) 2011 Manuel Lauss <manuel.lauss@googlemail.com> 6 * 7 * based on the old ALSA driver originally written by 8 * Charles Eidsness <charles@cooper-street.com> 9 */ 10 11 #include <linux/init.h> 12 #include <linux/module.h> 13 #include <linux/slab.h> 14 #include <linux/device.h> 15 #include <linux/delay.h> 16 #include <linux/mutex.h> 17 #include <linux/platform_device.h> 18 #include <linux/suspend.h> 19 #include <sound/core.h> 20 #include <sound/pcm.h> 21 #include <sound/initval.h> 22 #include <sound/soc.h> 23 #include <asm/mach-au1x00/au1000.h> 24 25 #include "psc.h" 26 27 /* register offsets and bits */ 28 #define AC97_CONFIG 0x00 29 #define AC97_STATUS 0x04 30 #define AC97_DATA 0x08 31 #define AC97_CMDRESP 0x0c 32 #define AC97_ENABLE 0x10 33 34 #define CFG_RC(x) (((x) & 0x3ff) << 13) /* valid rx slots mask */ 35 #define CFG_XS(x) (((x) & 0x3ff) << 3) /* valid tx slots mask */ 36 #define CFG_SG (1 << 2) /* sync gate */ 37 #define CFG_SN (1 << 1) /* sync control */ 38 #define CFG_RS (1 << 0) /* acrst# control */ 39 #define STAT_XU (1 << 11) /* tx underflow */ 40 #define STAT_XO (1 << 10) /* tx overflow */ 41 #define STAT_RU (1 << 9) /* rx underflow */ 42 #define STAT_RO (1 << 8) /* rx overflow */ 43 #define STAT_RD (1 << 7) /* codec ready */ 44 #define STAT_CP (1 << 6) /* command pending */ 45 #define STAT_TE (1 << 4) /* tx fifo empty */ 46 #define STAT_TF (1 << 3) /* tx fifo full */ 47 #define STAT_RE (1 << 1) /* rx fifo empty */ 48 #define STAT_RF (1 << 0) /* rx fifo full */ 49 #define CMD_SET_DATA(x) (((x) & 0xffff) << 16) 50 #define CMD_GET_DATA(x) ((x) & 0xffff) 51 #define CMD_READ (1 << 7) 52 #define CMD_WRITE (0 << 7) 53 #define CMD_IDX(x) ((x) & 0x7f) 54 #define EN_D (1 << 1) /* DISable bit */ 55 #define EN_CE (1 << 0) /* clock enable bit */ 56 57 /* how often to retry failed codec register reads/writes */ 58 #define AC97_RW_RETRIES 5 59 60 #define AC97_RATES \ 61 SNDRV_PCM_RATE_CONTINUOUS 62 63 #define AC97_FMTS \ 64 (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE) 65 66 /* instance data. There can be only one, MacLeod!!!!, fortunately there IS only 67 * once AC97C on early Alchemy chips. The newer ones aren't so lucky. 68 */ 69 static struct au1xpsc_audio_data *ac97c_workdata; 70 #define ac97_to_ctx(x) ac97c_workdata 71 72 static inline unsigned long RD(struct au1xpsc_audio_data *ctx, int reg) 73 { 74 return __raw_readl(ctx->mmio + reg); 75 } 76 77 static inline void WR(struct au1xpsc_audio_data *ctx, int reg, unsigned long v) 78 { 79 __raw_writel(v, ctx->mmio + reg); 80 wmb(); 81 } 82 83 static unsigned short au1xac97c_ac97_read(struct snd_ac97 *ac97, 84 unsigned short r) 85 { 86 struct au1xpsc_audio_data *ctx = ac97_to_ctx(ac97); 87 unsigned int tmo, retry; 88 unsigned long data; 89 90 data = ~0; 91 retry = AC97_RW_RETRIES; 92 do { 93 mutex_lock(&ctx->lock); 94 95 tmo = 6; 96 while ((RD(ctx, AC97_STATUS) & STAT_CP) && --tmo) 97 udelay(21); /* wait an ac97 frame time */ 98 if (!tmo) { 99 pr_debug("ac97rd timeout #1\n"); 100 goto next; 101 } 102 103 WR(ctx, AC97_CMDRESP, CMD_IDX(r) | CMD_READ); 104 105 /* stupid errata: data is only valid for 21us, so 106 * poll, Forrest, poll... 107 */ 108 tmo = 0x10000; 109 while ((RD(ctx, AC97_STATUS) & STAT_CP) && --tmo) 110 asm volatile ("nop"); 111 data = RD(ctx, AC97_CMDRESP); 112 113 if (!tmo) 114 pr_debug("ac97rd timeout #2\n"); 115 116 next: 117 mutex_unlock(&ctx->lock); 118 } while (--retry && !tmo); 119 120 pr_debug("AC97RD %04x %04lx %d\n", r, data, retry); 121 122 return retry ? data & 0xffff : 0xffff; 123 } 124 125 static void au1xac97c_ac97_write(struct snd_ac97 *ac97, unsigned short r, 126 unsigned short v) 127 { 128 struct au1xpsc_audio_data *ctx = ac97_to_ctx(ac97); 129 unsigned int tmo, retry; 130 131 retry = AC97_RW_RETRIES; 132 do { 133 mutex_lock(&ctx->lock); 134 135 for (tmo = 5; (RD(ctx, AC97_STATUS) & STAT_CP) && tmo; tmo--) 136 udelay(21); 137 if (!tmo) { 138 pr_debug("ac97wr timeout #1\n"); 139 goto next; 140 } 141 142 WR(ctx, AC97_CMDRESP, CMD_WRITE | CMD_IDX(r) | CMD_SET_DATA(v)); 143 144 for (tmo = 10; (RD(ctx, AC97_STATUS) & STAT_CP) && tmo; tmo--) 145 udelay(21); 146 if (!tmo) 147 pr_debug("ac97wr timeout #2\n"); 148 next: 149 mutex_unlock(&ctx->lock); 150 } while (--retry && !tmo); 151 152 pr_debug("AC97WR %04x %04x %d\n", r, v, retry); 153 } 154 155 static void au1xac97c_ac97_warm_reset(struct snd_ac97 *ac97) 156 { 157 struct au1xpsc_audio_data *ctx = ac97_to_ctx(ac97); 158 159 WR(ctx, AC97_CONFIG, ctx->cfg | CFG_SG | CFG_SN); 160 msleep(20); 161 WR(ctx, AC97_CONFIG, ctx->cfg | CFG_SG); 162 WR(ctx, AC97_CONFIG, ctx->cfg); 163 } 164 165 static void au1xac97c_ac97_cold_reset(struct snd_ac97 *ac97) 166 { 167 struct au1xpsc_audio_data *ctx = ac97_to_ctx(ac97); 168 int i; 169 170 WR(ctx, AC97_CONFIG, ctx->cfg | CFG_RS); 171 msleep(500); 172 WR(ctx, AC97_CONFIG, ctx->cfg); 173 174 /* wait for codec ready */ 175 i = 50; 176 while (((RD(ctx, AC97_STATUS) & STAT_RD) == 0) && --i) 177 msleep(20); 178 if (!i) 179 printk(KERN_ERR "ac97c: codec not ready after cold reset\n"); 180 } 181 182 /* AC97 controller operations */ 183 static struct snd_ac97_bus_ops ac97c_bus_ops = { 184 .read = au1xac97c_ac97_read, 185 .write = au1xac97c_ac97_write, 186 .reset = au1xac97c_ac97_cold_reset, 187 .warm_reset = au1xac97c_ac97_warm_reset, 188 }; 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 const 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 .probe = au1xac97c_dai_probe, 210 .playback = { 211 .rates = AC97_RATES, 212 .formats = AC97_FMTS, 213 .channels_min = 2, 214 .channels_max = 2, 215 }, 216 .capture = { 217 .rates = AC97_RATES, 218 .formats = AC97_FMTS, 219 .channels_min = 2, 220 .channels_max = 2, 221 }, 222 .ops = &alchemy_ac97c_ops, 223 }; 224 225 static const struct snd_soc_component_driver au1xac97c_component = { 226 .name = "au1xac97c", 227 .legacy_dai_naming = 1, 228 }; 229 230 static int au1xac97c_drvprobe(struct platform_device *pdev) 231 { 232 int ret; 233 struct resource *iores, *dmares; 234 struct au1xpsc_audio_data *ctx; 235 236 ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL); 237 if (!ctx) 238 return -ENOMEM; 239 240 mutex_init(&ctx->lock); 241 242 iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); 243 if (!iores) 244 return -ENODEV; 245 246 if (!devm_request_mem_region(&pdev->dev, iores->start, 247 resource_size(iores), 248 pdev->name)) 249 return -EBUSY; 250 251 ctx->mmio = devm_ioremap(&pdev->dev, iores->start, 252 resource_size(iores)); 253 if (!ctx->mmio) 254 return -EBUSY; 255 256 dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0); 257 if (!dmares) 258 return -EBUSY; 259 ctx->dmaids[SNDRV_PCM_STREAM_PLAYBACK] = dmares->start; 260 261 dmares = platform_get_resource(pdev, IORESOURCE_DMA, 1); 262 if (!dmares) 263 return -EBUSY; 264 ctx->dmaids[SNDRV_PCM_STREAM_CAPTURE] = dmares->start; 265 266 /* switch it on */ 267 WR(ctx, AC97_ENABLE, EN_D | EN_CE); 268 WR(ctx, AC97_ENABLE, EN_CE); 269 270 ctx->cfg = CFG_RC(3) | CFG_XS(3); 271 WR(ctx, AC97_CONFIG, ctx->cfg); 272 273 platform_set_drvdata(pdev, ctx); 274 275 ret = snd_soc_set_ac97_ops(&ac97c_bus_ops); 276 if (ret) 277 return ret; 278 279 ret = snd_soc_register_component(&pdev->dev, &au1xac97c_component, 280 &au1xac97c_dai_driver, 1); 281 if (ret) 282 return ret; 283 284 ac97c_workdata = ctx; 285 return 0; 286 } 287 288 static void au1xac97c_drvremove(struct platform_device *pdev) 289 { 290 struct au1xpsc_audio_data *ctx = platform_get_drvdata(pdev); 291 292 snd_soc_unregister_component(&pdev->dev); 293 294 WR(ctx, AC97_ENABLE, EN_D); /* clock off, disable */ 295 296 ac97c_workdata = NULL; /* MDEV */ 297 } 298 299 #ifdef CONFIG_PM 300 static int au1xac97c_drvsuspend(struct device *dev) 301 { 302 struct au1xpsc_audio_data *ctx = dev_get_drvdata(dev); 303 304 WR(ctx, AC97_ENABLE, EN_D); /* clock off, disable */ 305 306 return 0; 307 } 308 309 static int au1xac97c_drvresume(struct device *dev) 310 { 311 struct au1xpsc_audio_data *ctx = dev_get_drvdata(dev); 312 313 WR(ctx, AC97_ENABLE, EN_D | EN_CE); 314 WR(ctx, AC97_ENABLE, EN_CE); 315 WR(ctx, AC97_CONFIG, ctx->cfg); 316 317 return 0; 318 } 319 320 static const struct dev_pm_ops au1xpscac97_pmops = { 321 .suspend = au1xac97c_drvsuspend, 322 .resume = au1xac97c_drvresume, 323 }; 324 325 #define AU1XPSCAC97_PMOPS (&au1xpscac97_pmops) 326 327 #else 328 329 #define AU1XPSCAC97_PMOPS NULL 330 331 #endif 332 333 static struct platform_driver au1xac97c_driver = { 334 .driver = { 335 .name = "alchemy-ac97c", 336 .pm = AU1XPSCAC97_PMOPS, 337 }, 338 .probe = au1xac97c_drvprobe, 339 .remove_new = au1xac97c_drvremove, 340 }; 341 342 module_platform_driver(au1xac97c_driver); 343 344 MODULE_LICENSE("GPL"); 345 MODULE_DESCRIPTION("Au1000/1500/1100 AC97C ASoC driver"); 346 MODULE_AUTHOR("Manuel Lauss"); 347