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1// SPDX-License-Identifier: GPL-2.0
2//
3// Hitachi Audio Controller (AC97) support for SH7760/SH7780
4//
5// Copyright (c) 2007 Manuel Lauss <mano@roarinelk.homelinux.net>
6//
7// dont forget to set IPSEL/OMSEL register bits (in your board code) to
8// enable HAC output pins!
9
10/* BIG FAT FIXME: although the SH7760 has 2 independent AC97 units, only
11 * the FIRST can be used since ASoC does not pass any information to the
12 * ac97_read/write() functions regarding WHICH unit to use. You'll have
13 * to edit the code a bit to use the other AC97 unit. --mlau
14 */
15
16#include <linux/init.h>
17#include <linux/module.h>
18#include <linux/platform_device.h>
19#include <linux/interrupt.h>
20#include <linux/wait.h>
21#include <linux/delay.h>
22#include <sound/core.h>
23#include <sound/pcm.h>
24#include <sound/ac97_codec.h>
25#include <sound/initval.h>
26#include <sound/soc.h>
27
28/* regs and bits */
29#define HACCR 0x08
30#define HACCSAR 0x20
31#define HACCSDR 0x24
32#define HACPCML 0x28
33#define HACPCMR 0x2C
34#define HACTIER 0x50
35#define HACTSR 0x54
36#define HACRIER 0x58
37#define HACRSR 0x5C
38#define HACACR 0x60
39
40#define CR_CR (1 << 15) /* "codec-ready" indicator */
41#define CR_CDRT (1 << 11) /* cold reset */
42#define CR_WMRT (1 << 10) /* warm reset */
43#define CR_B9 (1 << 9) /* the mysterious "bit 9" */
44#define CR_ST (1 << 5) /* AC97 link start bit */
45
46#define CSAR_RD (1 << 19) /* AC97 data read bit */
47#define CSAR_WR (0)
48
49#define TSR_CMDAMT (1 << 31)
50#define TSR_CMDDMT (1 << 30)
51
52#define RSR_STARY (1 << 22)
53#define RSR_STDRY (1 << 21)
54
55#define ACR_DMARX16 (1 << 30)
56#define ACR_DMATX16 (1 << 29)
57#define ACR_TX12ATOM (1 << 26)
58#define ACR_DMARX20 ((1 << 24) | (1 << 22))
59#define ACR_DMATX20 ((1 << 23) | (1 << 21))
60
61#define CSDR_SHIFT 4
62#define CSDR_MASK (0xffff << CSDR_SHIFT)
63#define CSAR_SHIFT 12
64#define CSAR_MASK (0x7f << CSAR_SHIFT)
65
66#define AC97_WRITE_RETRY 1
67#define AC97_READ_RETRY 5
68
69/* manual-suggested AC97 codec access timeouts (us) */
70#define TMO_E1 500 /* 21 < E1 < 1000 */
71#define TMO_E2 13 /* 13 < E2 */
72#define TMO_E3 21 /* 21 < E3 */
73#define TMO_E4 500 /* 21 < E4 < 1000 */
74
75struct hac_priv {
76 unsigned long mmio; /* HAC base address */
77} hac_cpu_data[] = {
78#if defined(CONFIG_CPU_SUBTYPE_SH7760)
79 {
80 .mmio = 0xFE240000,
81 },
82 {
83 .mmio = 0xFE250000,
84 },
85#elif defined(CONFIG_CPU_SUBTYPE_SH7780)
86 {
87 .mmio = 0xFFE40000,
88 },
89#else
90#error "Unsupported SuperH SoC"
91#endif
92};
93
94#define HACREG(reg) (*(unsigned long *)(hac->mmio + (reg)))
95
96/*
97 * AC97 read/write flow as outlined in the SH7760 manual (pages 903-906)
98 */
99static int hac_get_codec_data(struct hac_priv *hac, unsigned short r,
100 unsigned short *v)
101{
102 unsigned int to1, to2, i;
103 unsigned short adr;
104
105 for (i = AC97_READ_RETRY; i; i--) {
106 *v = 0;
107 /* wait for HAC to receive something from the codec */
108 for (to1 = TMO_E4;
109 to1 && !(HACREG(HACRSR) & RSR_STARY);
110 --to1)
111 udelay(1);
112 for (to2 = TMO_E4;
113 to2 && !(HACREG(HACRSR) & RSR_STDRY);
114 --to2)
115 udelay(1);
116
117 if (!to1 && !to2)
118 return 0; /* codec comm is down */
119
120 adr = ((HACREG(HACCSAR) & CSAR_MASK) >> CSAR_SHIFT);
121 *v = ((HACREG(HACCSDR) & CSDR_MASK) >> CSDR_SHIFT);
122
123 HACREG(HACRSR) &= ~(RSR_STDRY | RSR_STARY);
124
125 if (r == adr)
126 break;
127
128 /* manual says: wait at least 21 usec before retrying */
129 udelay(21);
130 }
131 HACREG(HACRSR) &= ~(RSR_STDRY | RSR_STARY);
132 return i;
133}
134
135static unsigned short hac_read_codec_aux(struct hac_priv *hac,
136 unsigned short reg)
137{
138 unsigned short val;
139 unsigned int i, to;
140
141 for (i = AC97_READ_RETRY; i; i--) {
142 /* send_read_request */
143 local_irq_disable();
144 HACREG(HACTSR) &= ~(TSR_CMDAMT);
145 HACREG(HACCSAR) = (reg << CSAR_SHIFT) | CSAR_RD;
146 local_irq_enable();
147
148 for (to = TMO_E3;
149 to && !(HACREG(HACTSR) & TSR_CMDAMT);
150 --to)
151 udelay(1);
152
153 HACREG(HACTSR) &= ~TSR_CMDAMT;
154 val = 0;
155 if (hac_get_codec_data(hac, reg, &val) != 0)
156 break;
157 }
158
159 return i ? val : ~0;
160}
161
162static void hac_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
163 unsigned short val)
164{
165 int unit_id = 0 /* ac97->private_data */;
166 struct hac_priv *hac = &hac_cpu_data[unit_id];
167 unsigned int i, to;
168 /* write_codec_aux */
169 for (i = AC97_WRITE_RETRY; i; i--) {
170 /* send_write_request */
171 local_irq_disable();
172 HACREG(HACTSR) &= ~(TSR_CMDDMT | TSR_CMDAMT);
173 HACREG(HACCSDR) = (val << CSDR_SHIFT);
174 HACREG(HACCSAR) = (reg << CSAR_SHIFT) & (~CSAR_RD);
175 local_irq_enable();
176
177 /* poll-wait for CMDAMT and CMDDMT */
178 for (to = TMO_E1;
179 to && !(HACREG(HACTSR) & (TSR_CMDAMT|TSR_CMDDMT));
180 --to)
181 udelay(1);
182
183 HACREG(HACTSR) &= ~(TSR_CMDAMT | TSR_CMDDMT);
184 if (to)
185 break;
186 /* timeout, try again */
187 }
188}
189
190static unsigned short hac_ac97_read(struct snd_ac97 *ac97,
191 unsigned short reg)
192{
193 int unit_id = 0 /* ac97->private_data */;
194 struct hac_priv *hac = &hac_cpu_data[unit_id];
195 return hac_read_codec_aux(hac, reg);
196}
197
198static void hac_ac97_warmrst(struct snd_ac97 *ac97)
199{
200 int unit_id = 0 /* ac97->private_data */;
201 struct hac_priv *hac = &hac_cpu_data[unit_id];
202 unsigned int tmo;
203
204 HACREG(HACCR) = CR_WMRT | CR_ST | CR_B9;
205 msleep(10);
206 HACREG(HACCR) = CR_ST | CR_B9;
207 for (tmo = 1000; (tmo > 0) && !(HACREG(HACCR) & CR_CR); tmo--)
208 udelay(1);
209
210 if (!tmo)
211 printk(KERN_INFO "hac: reset: AC97 link down!\n");
212 /* settings this bit lets us have a conversation with codec */
213 HACREG(HACACR) |= ACR_TX12ATOM;
214}
215
216static void hac_ac97_coldrst(struct snd_ac97 *ac97)
217{
218 int unit_id = 0 /* ac97->private_data */;
219 struct hac_priv *hac;
220 hac = &hac_cpu_data[unit_id];
221
222 HACREG(HACCR) = 0;
223 HACREG(HACCR) = CR_CDRT | CR_ST | CR_B9;
224 msleep(10);
225 hac_ac97_warmrst(ac97);
226}
227
228static struct snd_ac97_bus_ops hac_ac97_ops = {
229 .read = hac_ac97_read,
230 .write = hac_ac97_write,
231 .reset = hac_ac97_coldrst,
232 .warm_reset = hac_ac97_warmrst,
233};
234
235static int hac_hw_params(struct snd_pcm_substream *substream,
236 struct snd_pcm_hw_params *params,
237 struct snd_soc_dai *dai)
238{
239 struct hac_priv *hac = &hac_cpu_data[dai->id];
240 int d = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1;
241
242 switch (params->msbits) {
243 case 16:
244 HACREG(HACACR) |= d ? ACR_DMARX16 : ACR_DMATX16;
245 HACREG(HACACR) &= d ? ~ACR_DMARX20 : ~ACR_DMATX20;
246 break;
247 case 20:
248 HACREG(HACACR) &= d ? ~ACR_DMARX16 : ~ACR_DMATX16;
249 HACREG(HACACR) |= d ? ACR_DMARX20 : ACR_DMATX20;
250 break;
251 default:
252 pr_debug("hac: invalid depth %d bit\n", params->msbits);
253 return -EINVAL;
254 break;
255 }
256
257 return 0;
258}
259
260#define AC97_RATES \
261 SNDRV_PCM_RATE_8000_192000
262
263#define AC97_FMTS \
264 SNDRV_PCM_FMTBIT_S16_LE
265
266static const struct snd_soc_dai_ops hac_dai_ops = {
267 .hw_params = hac_hw_params,
268};
269
270static struct snd_soc_dai_driver sh4_hac_dai[] = {
271{
272 .name = "hac-dai.0",
273 .playback = {
274 .rates = AC97_RATES,
275 .formats = AC97_FMTS,
276 .channels_min = 2,
277 .channels_max = 2,
278 },
279 .capture = {
280 .rates = AC97_RATES,
281 .formats = AC97_FMTS,
282 .channels_min = 2,
283 .channels_max = 2,
284 },
285 .ops = &hac_dai_ops,
286},
287#ifdef CONFIG_CPU_SUBTYPE_SH7760
288{
289 .name = "hac-dai.1",
290 .id = 1,
291 .playback = {
292 .rates = AC97_RATES,
293 .formats = AC97_FMTS,
294 .channels_min = 2,
295 .channels_max = 2,
296 },
297 .capture = {
298 .rates = AC97_RATES,
299 .formats = AC97_FMTS,
300 .channels_min = 2,
301 .channels_max = 2,
302 },
303 .ops = &hac_dai_ops,
304
305},
306#endif
307};
308
309static const struct snd_soc_component_driver sh4_hac_component = {
310 .name = "sh4-hac",
311 .legacy_dai_naming = 1,
312};
313
314static int hac_soc_platform_probe(struct platform_device *pdev)
315{
316 int ret;
317
318 ret = snd_soc_set_ac97_ops(&hac_ac97_ops);
319 if (ret != 0)
320 return ret;
321
322 return devm_snd_soc_register_component(&pdev->dev, &sh4_hac_component,
323 sh4_hac_dai, ARRAY_SIZE(sh4_hac_dai));
324}
325
326static void hac_soc_platform_remove(struct platform_device *pdev)
327{
328 snd_soc_set_ac97_ops(NULL);
329}
330
331static struct platform_driver hac_pcm_driver = {
332 .driver = {
333 .name = "hac-pcm-audio",
334 },
335
336 .probe = hac_soc_platform_probe,
337 .remove = hac_soc_platform_remove,
338};
339
340module_platform_driver(hac_pcm_driver);
341
342MODULE_LICENSE("GPL v2");
343MODULE_DESCRIPTION("SuperH onchip HAC (AC97) audio driver");
344MODULE_AUTHOR("Manuel Lauss <mano@roarinelk.homelinux.net>");