1 /* 2 * Hitachi Audio Controller (AC97) support for SH7760/SH7780 3 * 4 * Copyright (c) 2007 Manuel Lauss <mano@roarinelk.homelinux.net> 5 * licensed under the terms outlined in the file COPYING at the root 6 * of the linux kernel sources. 7 * 8 * dont forget to set IPSEL/OMSEL register bits (in your board code) to 9 * enable HAC output pins! 10 */ 11 12 /* BIG FAT FIXME: although the SH7760 has 2 independent AC97 units, only 13 * the FIRST can be used since ASoC does not pass any information to the 14 * ac97_read/write() functions regarding WHICH unit to use. You'll have 15 * to edit the code a bit to use the other AC97 unit. --mlau 16 */ 17 18 #include <linux/init.h> 19 #include <linux/module.h> 20 #include <linux/platform_device.h> 21 #include <linux/interrupt.h> 22 #include <linux/wait.h> 23 #include <linux/delay.h> 24 #include <sound/core.h> 25 #include <sound/pcm.h> 26 #include <sound/ac97_codec.h> 27 #include <sound/initval.h> 28 #include <sound/soc.h> 29 30 /* regs and bits */ 31 #define HACCR 0x08 32 #define HACCSAR 0x20 33 #define HACCSDR 0x24 34 #define HACPCML 0x28 35 #define HACPCMR 0x2C 36 #define HACTIER 0x50 37 #define HACTSR 0x54 38 #define HACRIER 0x58 39 #define HACRSR 0x5C 40 #define HACACR 0x60 41 42 #define CR_CR (1 << 15) /* "codec-ready" indicator */ 43 #define CR_CDRT (1 << 11) /* cold reset */ 44 #define CR_WMRT (1 << 10) /* warm reset */ 45 #define CR_B9 (1 << 9) /* the mysterious "bit 9" */ 46 #define CR_ST (1 << 5) /* AC97 link start bit */ 47 48 #define CSAR_RD (1 << 19) /* AC97 data read bit */ 49 #define CSAR_WR (0) 50 51 #define TSR_CMDAMT (1 << 31) 52 #define TSR_CMDDMT (1 << 30) 53 54 #define RSR_STARY (1 << 22) 55 #define RSR_STDRY (1 << 21) 56 57 #define ACR_DMARX16 (1 << 30) 58 #define ACR_DMATX16 (1 << 29) 59 #define ACR_TX12ATOM (1 << 26) 60 #define ACR_DMARX20 ((1 << 24) | (1 << 22)) 61 #define ACR_DMATX20 ((1 << 23) | (1 << 21)) 62 63 #define CSDR_SHIFT 4 64 #define CSDR_MASK (0xffff << CSDR_SHIFT) 65 #define CSAR_SHIFT 12 66 #define CSAR_MASK (0x7f << CSAR_SHIFT) 67 68 #define AC97_WRITE_RETRY 1 69 #define AC97_READ_RETRY 5 70 71 /* manual-suggested AC97 codec access timeouts (us) */ 72 #define TMO_E1 500 /* 21 < E1 < 1000 */ 73 #define TMO_E2 13 /* 13 < E2 */ 74 #define TMO_E3 21 /* 21 < E3 */ 75 #define TMO_E4 500 /* 21 < E4 < 1000 */ 76 77 struct hac_priv { 78 unsigned long mmio; /* HAC base address */ 79 } hac_cpu_data[] = { 80 #if defined(CONFIG_CPU_SUBTYPE_SH7760) 81 { 82 .mmio = 0xFE240000, 83 }, 84 { 85 .mmio = 0xFE250000, 86 }, 87 #elif defined(CONFIG_CPU_SUBTYPE_SH7780) 88 { 89 .mmio = 0xFFE40000, 90 }, 91 #else 92 #error "Unsupported SuperH SoC" 93 #endif 94 }; 95 96 #define HACREG(reg) (*(unsigned long *)(hac->mmio + (reg))) 97 98 /* 99 * AC97 read/write flow as outlined in the SH7760 manual (pages 903-906) 100 */ 101 static int hac_get_codec_data(struct hac_priv *hac, unsigned short r, 102 unsigned short *v) 103 { 104 unsigned int to1, to2, i; 105 unsigned short adr; 106 107 for (i = AC97_READ_RETRY; i; i--) { 108 *v = 0; 109 /* wait for HAC to receive something from the codec */ 110 for (to1 = TMO_E4; 111 to1 && !(HACREG(HACRSR) & RSR_STARY); 112 --to1) 113 udelay(1); 114 for (to2 = TMO_E4; 115 to2 && !(HACREG(HACRSR) & RSR_STDRY); 116 --to2) 117 udelay(1); 118 119 if (!to1 && !to2) 120 return 0; /* codec comm is down */ 121 122 adr = ((HACREG(HACCSAR) & CSAR_MASK) >> CSAR_SHIFT); 123 *v = ((HACREG(HACCSDR) & CSDR_MASK) >> CSDR_SHIFT); 124 125 HACREG(HACRSR) &= ~(RSR_STDRY | RSR_STARY); 126 127 if (r == adr) 128 break; 129 130 /* manual says: wait at least 21 usec before retrying */ 131 udelay(21); 132 } 133 HACREG(HACRSR) &= ~(RSR_STDRY | RSR_STARY); 134 return i; 135 } 136 137 static unsigned short hac_read_codec_aux(struct hac_priv *hac, 138 unsigned short reg) 139 { 140 unsigned short val; 141 unsigned int i, to; 142 143 for (i = AC97_READ_RETRY; i; i--) { 144 /* send_read_request */ 145 local_irq_disable(); 146 HACREG(HACTSR) &= ~(TSR_CMDAMT); 147 HACREG(HACCSAR) = (reg << CSAR_SHIFT) | CSAR_RD; 148 local_irq_enable(); 149 150 for (to = TMO_E3; 151 to && !(HACREG(HACTSR) & TSR_CMDAMT); 152 --to) 153 udelay(1); 154 155 HACREG(HACTSR) &= ~TSR_CMDAMT; 156 val = 0; 157 if (hac_get_codec_data(hac, reg, &val) != 0) 158 break; 159 } 160 161 return i ? val : ~0; 162 } 163 164 static void hac_ac97_write(struct snd_ac97 *ac97, unsigned short reg, 165 unsigned short val) 166 { 167 int unit_id = 0 /* ac97->private_data */; 168 struct hac_priv *hac = &hac_cpu_data[unit_id]; 169 unsigned int i, to; 170 /* write_codec_aux */ 171 for (i = AC97_WRITE_RETRY; i; i--) { 172 /* send_write_request */ 173 local_irq_disable(); 174 HACREG(HACTSR) &= ~(TSR_CMDDMT | TSR_CMDAMT); 175 HACREG(HACCSDR) = (val << CSDR_SHIFT); 176 HACREG(HACCSAR) = (reg << CSAR_SHIFT) & (~CSAR_RD); 177 local_irq_enable(); 178 179 /* poll-wait for CMDAMT and CMDDMT */ 180 for (to = TMO_E1; 181 to && !(HACREG(HACTSR) & (TSR_CMDAMT|TSR_CMDDMT)); 182 --to) 183 udelay(1); 184 185 HACREG(HACTSR) &= ~(TSR_CMDAMT | TSR_CMDDMT); 186 if (to) 187 break; 188 /* timeout, try again */ 189 } 190 } 191 192 static unsigned short hac_ac97_read(struct snd_ac97 *ac97, 193 unsigned short reg) 194 { 195 int unit_id = 0 /* ac97->private_data */; 196 struct hac_priv *hac = &hac_cpu_data[unit_id]; 197 return hac_read_codec_aux(hac, reg); 198 } 199 200 static void hac_ac97_warmrst(struct snd_ac97 *ac97) 201 { 202 int unit_id = 0 /* ac97->private_data */; 203 struct hac_priv *hac = &hac_cpu_data[unit_id]; 204 unsigned int tmo; 205 206 HACREG(HACCR) = CR_WMRT | CR_ST | CR_B9; 207 msleep(10); 208 HACREG(HACCR) = CR_ST | CR_B9; 209 for (tmo = 1000; (tmo > 0) && !(HACREG(HACCR) & CR_CR); tmo--) 210 udelay(1); 211 212 if (!tmo) 213 printk(KERN_INFO "hac: reset: AC97 link down!\n"); 214 /* settings this bit lets us have a conversation with codec */ 215 HACREG(HACACR) |= ACR_TX12ATOM; 216 } 217 218 static void hac_ac97_coldrst(struct snd_ac97 *ac97) 219 { 220 int unit_id = 0 /* ac97->private_data */; 221 struct hac_priv *hac; 222 hac = &hac_cpu_data[unit_id]; 223 224 HACREG(HACCR) = 0; 225 HACREG(HACCR) = CR_CDRT | CR_ST | CR_B9; 226 msleep(10); 227 hac_ac97_warmrst(ac97); 228 } 229 230 struct snd_ac97_bus_ops soc_ac97_ops = { 231 .read = hac_ac97_read, 232 .write = hac_ac97_write, 233 .reset = hac_ac97_coldrst, 234 .warm_reset = hac_ac97_warmrst, 235 }; 236 EXPORT_SYMBOL_GPL(soc_ac97_ops); 237 238 static int hac_hw_params(struct snd_pcm_substream *substream, 239 struct snd_pcm_hw_params *params, 240 struct snd_soc_dai *dai) 241 { 242 struct hac_priv *hac = &hac_cpu_data[dai->id]; 243 int d = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1; 244 245 switch (params->msbits) { 246 case 16: 247 HACREG(HACACR) |= d ? ACR_DMARX16 : ACR_DMATX16; 248 HACREG(HACACR) &= d ? ~ACR_DMARX20 : ~ACR_DMATX20; 249 break; 250 case 20: 251 HACREG(HACACR) &= d ? ~ACR_DMARX16 : ~ACR_DMATX16; 252 HACREG(HACACR) |= d ? ACR_DMARX20 : ACR_DMATX20; 253 break; 254 default: 255 pr_debug("hac: invalid depth %d bit\n", params->msbits); 256 return -EINVAL; 257 break; 258 } 259 260 return 0; 261 } 262 263 #define AC97_RATES \ 264 SNDRV_PCM_RATE_8000_192000 265 266 #define AC97_FMTS \ 267 SNDRV_PCM_FMTBIT_S16_LE 268 269 static const struct snd_soc_dai_ops hac_dai_ops = { 270 .hw_params = hac_hw_params, 271 }; 272 273 static struct snd_soc_dai_driver sh4_hac_dai[] = { 274 { 275 .name = "hac-dai.0", 276 .ac97_control = 1, 277 .playback = { 278 .rates = AC97_RATES, 279 .formats = AC97_FMTS, 280 .channels_min = 2, 281 .channels_max = 2, 282 }, 283 .capture = { 284 .rates = AC97_RATES, 285 .formats = AC97_FMTS, 286 .channels_min = 2, 287 .channels_max = 2, 288 }, 289 .ops = &hac_dai_ops, 290 }, 291 #ifdef CONFIG_CPU_SUBTYPE_SH7760 292 { 293 .name = "hac-dai.1", 294 .id = 1, 295 .playback = { 296 .rates = AC97_RATES, 297 .formats = AC97_FMTS, 298 .channels_min = 2, 299 .channels_max = 2, 300 }, 301 .capture = { 302 .rates = AC97_RATES, 303 .formats = AC97_FMTS, 304 .channels_min = 2, 305 .channels_max = 2, 306 }, 307 .ops = &hac_dai_ops, 308 309 }, 310 #endif 311 }; 312 313 static int hac_soc_platform_probe(struct platform_device *pdev) 314 { 315 return snd_soc_register_dais(&pdev->dev, sh4_hac_dai, 316 ARRAY_SIZE(sh4_hac_dai)); 317 } 318 319 static int hac_soc_platform_remove(struct platform_device *pdev) 320 { 321 snd_soc_unregister_dais(&pdev->dev, ARRAY_SIZE(sh4_hac_dai)); 322 return 0; 323 } 324 325 static struct platform_driver hac_pcm_driver = { 326 .driver = { 327 .name = "hac-pcm-audio", 328 .owner = THIS_MODULE, 329 }, 330 331 .probe = hac_soc_platform_probe, 332 .remove = hac_soc_platform_remove, 333 }; 334 335 module_platform_driver(hac_pcm_driver); 336 337 MODULE_LICENSE("GPL"); 338 MODULE_DESCRIPTION("SuperH onchip HAC (AC97) audio driver"); 339 MODULE_AUTHOR("Manuel Lauss <mano@roarinelk.homelinux.net>"); 340