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aef3b06a ML |
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> | |
aef3b06a ML |
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 | ||
690eceb5 | 107 | for (i = AC97_READ_RETRY; i; i--) { |
aef3b06a ML |
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); | |
690eceb5 | 134 | return i; |
aef3b06a ML |
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 | ||
690eceb5 | 143 | for (i = AC97_READ_RETRY; i; i--) { |
aef3b06a ML |
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 | ||
690eceb5 | 161 | return i ? val : ~0; |
aef3b06a ML |
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 */ | |
690eceb5 | 171 | for (i = AC97_WRITE_RETRY; i; i--) { |
aef3b06a ML |
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, | |
dee89c4d MB |
239 | struct snd_pcm_hw_params *params, |
240 | struct snd_soc_dai *dai) | |
aef3b06a ML |
241 | { |
242 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
243 | struct hac_priv *hac = &hac_cpu_data[rtd->dai->cpu_dai->id]; | |
244 | int d = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1; | |
245 | ||
246 | switch (params->msbits) { | |
247 | case 16: | |
248 | HACREG(HACACR) |= d ? ACR_DMARX16 : ACR_DMATX16; | |
249 | HACREG(HACACR) &= d ? ~ACR_DMARX20 : ~ACR_DMATX20; | |
250 | break; | |
251 | case 20: | |
252 | HACREG(HACACR) &= d ? ~ACR_DMARX16 : ~ACR_DMATX16; | |
253 | HACREG(HACACR) |= d ? ACR_DMARX20 : ACR_DMATX20; | |
254 | break; | |
255 | default: | |
256 | pr_debug("hac: invalid depth %d bit\n", params->msbits); | |
257 | return -EINVAL; | |
258 | break; | |
259 | } | |
260 | ||
261 | return 0; | |
262 | } | |
263 | ||
264 | #define AC97_RATES \ | |
265 | SNDRV_PCM_RATE_8000_192000 | |
266 | ||
267 | #define AC97_FMTS \ | |
268 | SNDRV_PCM_FMTBIT_S16_LE | |
269 | ||
53640650 | 270 | struct snd_soc_dai sh4_hac_dai[] = { |
aef3b06a ML |
271 | { |
272 | .name = "HAC0", | |
273 | .id = 0, | |
3ba9e10a | 274 | .ac97_control = 1, |
aef3b06a ML |
275 | .playback = { |
276 | .rates = AC97_RATES, | |
277 | .formats = AC97_FMTS, | |
278 | .channels_min = 2, | |
279 | .channels_max = 2, | |
280 | }, | |
281 | .capture = { | |
282 | .rates = AC97_RATES, | |
283 | .formats = AC97_FMTS, | |
284 | .channels_min = 2, | |
285 | .channels_max = 2, | |
286 | }, | |
287 | .ops = { | |
288 | .hw_params = hac_hw_params, | |
289 | }, | |
290 | }, | |
291 | #ifdef CONFIG_CPU_SUBTYPE_SH7760 | |
292 | { | |
293 | .name = "HAC1", | |
3ba9e10a | 294 | .ac97_control = 1, |
aef3b06a | 295 | .id = 1, |
aef3b06a ML |
296 | .playback = { |
297 | .rates = AC97_RATES, | |
298 | .formats = AC97_FMTS, | |
299 | .channels_min = 2, | |
300 | .channels_max = 2, | |
301 | }, | |
302 | .capture = { | |
303 | .rates = AC97_RATES, | |
304 | .formats = AC97_FMTS, | |
305 | .channels_min = 2, | |
306 | .channels_max = 2, | |
307 | }, | |
308 | .ops = { | |
309 | .hw_params = hac_hw_params, | |
310 | }, | |
311 | ||
312 | }, | |
313 | #endif | |
314 | }; | |
315 | EXPORT_SYMBOL_GPL(sh4_hac_dai); | |
316 | ||
317 | MODULE_LICENSE("GPL"); | |
318 | MODULE_DESCRIPTION("SuperH onchip HAC (AC97) audio driver"); | |
319 | MODULE_AUTHOR("Manuel Lauss <mano@roarinelk.homelinux.net>"); |