diff options
Diffstat (limited to 'sound/soc/sh/hac.c')
-rw-r--r-- | sound/soc/sh/hac.c | 322 |
1 files changed, 322 insertions, 0 deletions
diff --git a/sound/soc/sh/hac.c b/sound/soc/sh/hac.c new file mode 100644 index 000000000000..8e3f03908cdb --- /dev/null +++ b/sound/soc/sh/hac.c | |||
@@ -0,0 +1,322 @@ | |||
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/driver.h> | ||
25 | #include <sound/core.h> | ||
26 | #include <sound/pcm.h> | ||
27 | #include <sound/ac97_codec.h> | ||
28 | #include <sound/initval.h> | ||
29 | #include <sound/soc.h> | ||
30 | |||
31 | /* regs and bits */ | ||
32 | #define HACCR 0x08 | ||
33 | #define HACCSAR 0x20 | ||
34 | #define HACCSDR 0x24 | ||
35 | #define HACPCML 0x28 | ||
36 | #define HACPCMR 0x2C | ||
37 | #define HACTIER 0x50 | ||
38 | #define HACTSR 0x54 | ||
39 | #define HACRIER 0x58 | ||
40 | #define HACRSR 0x5C | ||
41 | #define HACACR 0x60 | ||
42 | |||
43 | #define CR_CR (1 << 15) /* "codec-ready" indicator */ | ||
44 | #define CR_CDRT (1 << 11) /* cold reset */ | ||
45 | #define CR_WMRT (1 << 10) /* warm reset */ | ||
46 | #define CR_B9 (1 << 9) /* the mysterious "bit 9" */ | ||
47 | #define CR_ST (1 << 5) /* AC97 link start bit */ | ||
48 | |||
49 | #define CSAR_RD (1 << 19) /* AC97 data read bit */ | ||
50 | #define CSAR_WR (0) | ||
51 | |||
52 | #define TSR_CMDAMT (1 << 31) | ||
53 | #define TSR_CMDDMT (1 << 30) | ||
54 | |||
55 | #define RSR_STARY (1 << 22) | ||
56 | #define RSR_STDRY (1 << 21) | ||
57 | |||
58 | #define ACR_DMARX16 (1 << 30) | ||
59 | #define ACR_DMATX16 (1 << 29) | ||
60 | #define ACR_TX12ATOM (1 << 26) | ||
61 | #define ACR_DMARX20 ((1 << 24) | (1 << 22)) | ||
62 | #define ACR_DMATX20 ((1 << 23) | (1 << 21)) | ||
63 | |||
64 | #define CSDR_SHIFT 4 | ||
65 | #define CSDR_MASK (0xffff << CSDR_SHIFT) | ||
66 | #define CSAR_SHIFT 12 | ||
67 | #define CSAR_MASK (0x7f << CSAR_SHIFT) | ||
68 | |||
69 | #define AC97_WRITE_RETRY 1 | ||
70 | #define AC97_READ_RETRY 5 | ||
71 | |||
72 | /* manual-suggested AC97 codec access timeouts (us) */ | ||
73 | #define TMO_E1 500 /* 21 < E1 < 1000 */ | ||
74 | #define TMO_E2 13 /* 13 < E2 */ | ||
75 | #define TMO_E3 21 /* 21 < E3 */ | ||
76 | #define TMO_E4 500 /* 21 < E4 < 1000 */ | ||
77 | |||
78 | struct hac_priv { | ||
79 | unsigned long mmio; /* HAC base address */ | ||
80 | } hac_cpu_data[] = { | ||
81 | #if defined(CONFIG_CPU_SUBTYPE_SH7760) | ||
82 | { | ||
83 | .mmio = 0xFE240000, | ||
84 | }, | ||
85 | { | ||
86 | .mmio = 0xFE250000, | ||
87 | }, | ||
88 | #elif defined(CONFIG_CPU_SUBTYPE_SH7780) | ||
89 | { | ||
90 | .mmio = 0xFFE40000, | ||
91 | }, | ||
92 | #else | ||
93 | #error "Unsupported SuperH SoC" | ||
94 | #endif | ||
95 | }; | ||
96 | |||
97 | #define HACREG(reg) (*(unsigned long *)(hac->mmio + (reg))) | ||
98 | |||
99 | /* | ||
100 | * AC97 read/write flow as outlined in the SH7760 manual (pages 903-906) | ||
101 | */ | ||
102 | static int hac_get_codec_data(struct hac_priv *hac, unsigned short r, | ||
103 | unsigned short *v) | ||
104 | { | ||
105 | unsigned int to1, to2, i; | ||
106 | unsigned short adr; | ||
107 | |||
108 | for (i = 0; i < AC97_READ_RETRY; ++i) { | ||
109 | *v = 0; | ||
110 | /* wait for HAC to receive something from the codec */ | ||
111 | for (to1 = TMO_E4; | ||
112 | to1 && !(HACREG(HACRSR) & RSR_STARY); | ||
113 | --to1) | ||
114 | udelay(1); | ||
115 | for (to2 = TMO_E4; | ||
116 | to2 && !(HACREG(HACRSR) & RSR_STDRY); | ||
117 | --to2) | ||
118 | udelay(1); | ||
119 | |||
120 | if (!to1 && !to2) | ||
121 | return 0; /* codec comm is down */ | ||
122 | |||
123 | adr = ((HACREG(HACCSAR) & CSAR_MASK) >> CSAR_SHIFT); | ||
124 | *v = ((HACREG(HACCSDR) & CSDR_MASK) >> CSDR_SHIFT); | ||
125 | |||
126 | HACREG(HACRSR) &= ~(RSR_STDRY | RSR_STARY); | ||
127 | |||
128 | if (r == adr) | ||
129 | break; | ||
130 | |||
131 | /* manual says: wait at least 21 usec before retrying */ | ||
132 | udelay(21); | ||
133 | } | ||
134 | HACREG(HACRSR) &= ~(RSR_STDRY | RSR_STARY); | ||
135 | return (i < AC97_READ_RETRY); | ||
136 | } | ||
137 | |||
138 | static unsigned short hac_read_codec_aux(struct hac_priv *hac, | ||
139 | unsigned short reg) | ||
140 | { | ||
141 | unsigned short val; | ||
142 | unsigned int i, to; | ||
143 | |||
144 | for (i = 0; i < AC97_READ_RETRY; i++) { | ||
145 | /* send_read_request */ | ||
146 | local_irq_disable(); | ||
147 | HACREG(HACTSR) &= ~(TSR_CMDAMT); | ||
148 | HACREG(HACCSAR) = (reg << CSAR_SHIFT) | CSAR_RD; | ||
149 | local_irq_enable(); | ||
150 | |||
151 | for (to = TMO_E3; | ||
152 | to && !(HACREG(HACTSR) & TSR_CMDAMT); | ||
153 | --to) | ||
154 | udelay(1); | ||
155 | |||
156 | HACREG(HACTSR) &= ~TSR_CMDAMT; | ||
157 | val = 0; | ||
158 | if (hac_get_codec_data(hac, reg, &val) != 0) | ||
159 | break; | ||
160 | } | ||
161 | |||
162 | if (i == AC97_READ_RETRY) | ||
163 | return ~0; | ||
164 | |||
165 | return val; | ||
166 | } | ||
167 | |||
168 | static void hac_ac97_write(struct snd_ac97 *ac97, unsigned short reg, | ||
169 | unsigned short val) | ||
170 | { | ||
171 | int unit_id = 0 /* ac97->private_data */; | ||
172 | struct hac_priv *hac = &hac_cpu_data[unit_id]; | ||
173 | unsigned int i, to; | ||
174 | /* write_codec_aux */ | ||
175 | for (i = 0; i < AC97_WRITE_RETRY; i++) { | ||
176 | /* send_write_request */ | ||
177 | local_irq_disable(); | ||
178 | HACREG(HACTSR) &= ~(TSR_CMDDMT | TSR_CMDAMT); | ||
179 | HACREG(HACCSDR) = (val << CSDR_SHIFT); | ||
180 | HACREG(HACCSAR) = (reg << CSAR_SHIFT) & (~CSAR_RD); | ||
181 | local_irq_enable(); | ||
182 | |||
183 | /* poll-wait for CMDAMT and CMDDMT */ | ||
184 | for (to = TMO_E1; | ||
185 | to && !(HACREG(HACTSR) & (TSR_CMDAMT|TSR_CMDDMT)); | ||
186 | --to) | ||
187 | udelay(1); | ||
188 | |||
189 | HACREG(HACTSR) &= ~(TSR_CMDAMT | TSR_CMDDMT); | ||
190 | if (to) | ||
191 | break; | ||
192 | /* timeout, try again */ | ||
193 | } | ||
194 | } | ||
195 | |||
196 | static unsigned short hac_ac97_read(struct snd_ac97 *ac97, | ||
197 | unsigned short reg) | ||
198 | { | ||
199 | int unit_id = 0 /* ac97->private_data */; | ||
200 | struct hac_priv *hac = &hac_cpu_data[unit_id]; | ||
201 | return hac_read_codec_aux(hac, reg); | ||
202 | } | ||
203 | |||
204 | static void hac_ac97_warmrst(struct snd_ac97 *ac97) | ||
205 | { | ||
206 | int unit_id = 0 /* ac97->private_data */; | ||
207 | struct hac_priv *hac = &hac_cpu_data[unit_id]; | ||
208 | unsigned int tmo; | ||
209 | |||
210 | HACREG(HACCR) = CR_WMRT | CR_ST | CR_B9; | ||
211 | msleep(10); | ||
212 | HACREG(HACCR) = CR_ST | CR_B9; | ||
213 | for (tmo = 1000; (tmo > 0) && !(HACREG(HACCR) & CR_CR); tmo--) | ||
214 | udelay(1); | ||
215 | |||
216 | if (!tmo) | ||
217 | printk(KERN_INFO "hac: reset: AC97 link down!\n"); | ||
218 | /* settings this bit lets us have a conversation with codec */ | ||
219 | HACREG(HACACR) |= ACR_TX12ATOM; | ||
220 | } | ||
221 | |||
222 | static void hac_ac97_coldrst(struct snd_ac97 *ac97) | ||
223 | { | ||
224 | int unit_id = 0 /* ac97->private_data */; | ||
225 | struct hac_priv *hac; | ||
226 | hac = &hac_cpu_data[unit_id]; | ||
227 | |||
228 | HACREG(HACCR) = 0; | ||
229 | HACREG(HACCR) = CR_CDRT | CR_ST | CR_B9; | ||
230 | msleep(10); | ||
231 | hac_ac97_warmrst(ac97); | ||
232 | } | ||
233 | |||
234 | struct snd_ac97_bus_ops soc_ac97_ops = { | ||
235 | .read = hac_ac97_read, | ||
236 | .write = hac_ac97_write, | ||
237 | .reset = hac_ac97_coldrst, | ||
238 | .warm_reset = hac_ac97_warmrst, | ||
239 | }; | ||
240 | EXPORT_SYMBOL_GPL(soc_ac97_ops); | ||
241 | |||
242 | static int hac_hw_params(struct snd_pcm_substream *substream, | ||
243 | struct snd_pcm_hw_params *params) | ||
244 | { | ||
245 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | ||
246 | struct hac_priv *hac = &hac_cpu_data[rtd->dai->cpu_dai->id]; | ||
247 | int d = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1; | ||
248 | |||
249 | switch (params->msbits) { | ||
250 | case 16: | ||
251 | HACREG(HACACR) |= d ? ACR_DMARX16 : ACR_DMATX16; | ||
252 | HACREG(HACACR) &= d ? ~ACR_DMARX20 : ~ACR_DMATX20; | ||
253 | break; | ||
254 | case 20: | ||
255 | HACREG(HACACR) &= d ? ~ACR_DMARX16 : ~ACR_DMATX16; | ||
256 | HACREG(HACACR) |= d ? ACR_DMARX20 : ACR_DMATX20; | ||
257 | break; | ||
258 | default: | ||
259 | pr_debug("hac: invalid depth %d bit\n", params->msbits); | ||
260 | return -EINVAL; | ||
261 | break; | ||
262 | } | ||
263 | |||
264 | return 0; | ||
265 | } | ||
266 | |||
267 | #define AC97_RATES \ | ||
268 | SNDRV_PCM_RATE_8000_192000 | ||
269 | |||
270 | #define AC97_FMTS \ | ||
271 | SNDRV_PCM_FMTBIT_S16_LE | ||
272 | |||
273 | struct snd_soc_cpu_dai sh4_hac_dai[] = { | ||
274 | { | ||
275 | .name = "HAC0", | ||
276 | .id = 0, | ||
277 | .type = SND_SOC_DAI_AC97, | ||
278 | .playback = { | ||
279 | .rates = AC97_RATES, | ||
280 | .formats = AC97_FMTS, | ||
281 | .channels_min = 2, | ||
282 | .channels_max = 2, | ||
283 | }, | ||
284 | .capture = { | ||
285 | .rates = AC97_RATES, | ||
286 | .formats = AC97_FMTS, | ||
287 | .channels_min = 2, | ||
288 | .channels_max = 2, | ||
289 | }, | ||
290 | .ops = { | ||
291 | .hw_params = hac_hw_params, | ||
292 | }, | ||
293 | }, | ||
294 | #ifdef CONFIG_CPU_SUBTYPE_SH7760 | ||
295 | { | ||
296 | .name = "HAC1", | ||
297 | .id = 1, | ||
298 | .type = SND_SOC_DAI_AC97, | ||
299 | .playback = { | ||
300 | .rates = AC97_RATES, | ||
301 | .formats = AC97_FMTS, | ||
302 | .channels_min = 2, | ||
303 | .channels_max = 2, | ||
304 | }, | ||
305 | .capture = { | ||
306 | .rates = AC97_RATES, | ||
307 | .formats = AC97_FMTS, | ||
308 | .channels_min = 2, | ||
309 | .channels_max = 2, | ||
310 | }, | ||
311 | .ops = { | ||
312 | .hw_params = hac_hw_params, | ||
313 | }, | ||
314 | |||
315 | }, | ||
316 | #endif | ||
317 | }; | ||
318 | EXPORT_SYMBOL_GPL(sh4_hac_dai); | ||
319 | |||
320 | MODULE_LICENSE("GPL"); | ||
321 | MODULE_DESCRIPTION("SuperH onchip HAC (AC97) audio driver"); | ||
322 | MODULE_AUTHOR("Manuel Lauss <mano@roarinelk.homelinux.net>"); | ||