2 * Hitachi Audio Controller (AC97) support for SH7760/SH7780
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.
8 * dont forget to set IPSEL/OMSEL register bits (in your board code) to
9 * enable HAC output pins!
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
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>
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 */
48 #define CSAR_RD (1 << 19) /* AC97 data read bit */
51 #define TSR_CMDAMT (1 << 31)
52 #define TSR_CMDDMT (1 << 30)
54 #define RSR_STARY (1 << 22)
55 #define RSR_STDRY (1 << 21)
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))
64 #define CSDR_MASK (0xffff << CSDR_SHIFT)
66 #define CSAR_MASK (0x7f << CSAR_SHIFT)
68 #define AC97_WRITE_RETRY 1
69 #define AC97_READ_RETRY 5
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 */
78 unsigned long mmio; /* HAC base address */
80 #if defined(CONFIG_CPU_SUBTYPE_SH7760)
87 #elif defined(CONFIG_CPU_SUBTYPE_SH7780)
92 #error "Unsupported SuperH SoC"
96 #define HACREG(reg) (*(unsigned long *)(hac->mmio + (reg)))
99 * AC97 read/write flow as outlined in the SH7760 manual (pages 903-906)
101 static int hac_get_codec_data(struct hac_priv *hac, unsigned short r,
104 unsigned int to1, to2, i;
107 for (i = AC97_READ_RETRY; i; i--) {
109 /* wait for HAC to receive something from the codec */
111 to1 && !(HACREG(HACRSR) & RSR_STARY);
115 to2 && !(HACREG(HACRSR) & RSR_STDRY);
120 return 0; /* codec comm is down */
122 adr = ((HACREG(HACCSAR) & CSAR_MASK) >> CSAR_SHIFT);
123 *v = ((HACREG(HACCSDR) & CSDR_MASK) >> CSDR_SHIFT);
125 HACREG(HACRSR) &= ~(RSR_STDRY | RSR_STARY);
130 /* manual says: wait at least 21 usec before retrying */
133 HACREG(HACRSR) &= ~(RSR_STDRY | RSR_STARY);
137 static unsigned short hac_read_codec_aux(struct hac_priv *hac,
143 for (i = AC97_READ_RETRY; i; i--) {
144 /* send_read_request */
146 HACREG(HACTSR) &= ~(TSR_CMDAMT);
147 HACREG(HACCSAR) = (reg << CSAR_SHIFT) | CSAR_RD;
151 to && !(HACREG(HACTSR) & TSR_CMDAMT);
155 HACREG(HACTSR) &= ~TSR_CMDAMT;
157 if (hac_get_codec_data(hac, reg, &val) != 0)
164 static void hac_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
167 int unit_id = 0 /* ac97->private_data */;
168 struct hac_priv *hac = &hac_cpu_data[unit_id];
170 /* write_codec_aux */
171 for (i = AC97_WRITE_RETRY; i; i--) {
172 /* send_write_request */
174 HACREG(HACTSR) &= ~(TSR_CMDDMT | TSR_CMDAMT);
175 HACREG(HACCSDR) = (val << CSDR_SHIFT);
176 HACREG(HACCSAR) = (reg << CSAR_SHIFT) & (~CSAR_RD);
179 /* poll-wait for CMDAMT and CMDDMT */
181 to && !(HACREG(HACTSR) & (TSR_CMDAMT|TSR_CMDDMT));
185 HACREG(HACTSR) &= ~(TSR_CMDAMT | TSR_CMDDMT);
188 /* timeout, try again */
192 static unsigned short hac_ac97_read(struct snd_ac97 *ac97,
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);
200 static void hac_ac97_warmrst(struct snd_ac97 *ac97)
202 int unit_id = 0 /* ac97->private_data */;
203 struct hac_priv *hac = &hac_cpu_data[unit_id];
206 HACREG(HACCR) = CR_WMRT | CR_ST | CR_B9;
208 HACREG(HACCR) = CR_ST | CR_B9;
209 for (tmo = 1000; (tmo > 0) && !(HACREG(HACCR) & CR_CR); 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;
218 static void hac_ac97_coldrst(struct snd_ac97 *ac97)
220 int unit_id = 0 /* ac97->private_data */;
221 struct hac_priv *hac;
222 hac = &hac_cpu_data[unit_id];
225 HACREG(HACCR) = CR_CDRT | CR_ST | CR_B9;
227 hac_ac97_warmrst(ac97);
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,
236 EXPORT_SYMBOL_GPL(soc_ac97_ops);
238 static int hac_hw_params(struct snd_pcm_substream *substream,
239 struct snd_pcm_hw_params *params)
241 struct snd_soc_pcm_runtime *rtd = substream->private_data;
242 struct hac_priv *hac = &hac_cpu_data[rtd->dai->cpu_dai->id];
243 int d = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1;
245 switch (params->msbits) {
247 HACREG(HACACR) |= d ? ACR_DMARX16 : ACR_DMATX16;
248 HACREG(HACACR) &= d ? ~ACR_DMARX20 : ~ACR_DMATX20;
251 HACREG(HACACR) &= d ? ~ACR_DMARX16 : ~ACR_DMATX16;
252 HACREG(HACACR) |= d ? ACR_DMARX20 : ACR_DMATX20;
255 pr_debug("hac: invalid depth %d bit\n", params->msbits);
264 SNDRV_PCM_RATE_8000_192000
267 SNDRV_PCM_FMTBIT_S16_LE
269 struct snd_soc_dai sh4_hac_dai[] = {
273 .type = SND_SOC_DAI_AC97,
276 .formats = AC97_FMTS,
282 .formats = AC97_FMTS,
287 .hw_params = hac_hw_params,
290 #ifdef CONFIG_CPU_SUBTYPE_SH7760
294 .type = SND_SOC_DAI_AC97,
297 .formats = AC97_FMTS,
303 .formats = AC97_FMTS,
308 .hw_params = hac_hw_params,
314 EXPORT_SYMBOL_GPL(sh4_hac_dai);
316 MODULE_LICENSE("GPL");
317 MODULE_DESCRIPTION("SuperH onchip HAC (AC97) audio driver");
318 MODULE_AUTHOR("Manuel Lauss <mano@roarinelk.homelinux.net>");