1 /*
2 * bf5xx-ac97.c -- AC97 support for the ADI blackfin chip.
3 *
4 * Author: Roy Huang
5 * Created: 11th. June 2007
6 * Copyright: Analog Device Inc.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13 #include <linux/init.h>
14 #include <linux/module.h>
15 #include <linux/platform_device.h>
16 #include <linux/interrupt.h>
17 #include <linux/wait.h>
18 #include <linux/delay.h>
19 #include <linux/slab.h>
20
21 #include <sound/core.h>
22 #include <sound/pcm.h>
23 #include <sound/ac97_codec.h>
24 #include <sound/initval.h>
25 #include <sound/soc.h>
26
27 #include <asm/irq.h>
28 #include <asm/portmux.h>
29 #include <linux/mutex.h>
30 #include <linux/gpio.h>
31
32 #include "bf5xx-sport.h"
33 #include "bf5xx-ac97.h"
34
35 /* Anomaly notes:
36 * 05000250 - AD1980 is running in TDM mode and RFS/TFS are generated by SPORT
37 * contrtoller. But, RFSDIV and TFSDIV are always set to 16*16-1,
38 * while the max AC97 data size is 13*16. The DIV is always larger
39 * than data size. AD73311 and ad2602 are not running in TDM mode.
40 * AD1836 and AD73322 depend on external RFS/TFS only. So, this
41 * anomaly does not affect blackfin sound drivers.
42 */
43
44 static struct sport_device *ac97_sport_handle;
45
bf5xx_pcm_to_ac97(struct ac97_frame * dst,const __u16 * src,size_t count,unsigned int chan_mask)46 void bf5xx_pcm_to_ac97(struct ac97_frame *dst, const __u16 *src,
47 size_t count, unsigned int chan_mask)
48 {
49 while (count--) {
50 dst->ac97_tag = TAG_VALID;
51 if (chan_mask & SP_FL) {
52 dst->ac97_pcm_r = *src++;
53 dst->ac97_tag |= TAG_PCM_RIGHT;
54 }
55 if (chan_mask & SP_FR) {
56 dst->ac97_pcm_l = *src++;
57 dst->ac97_tag |= TAG_PCM_LEFT;
58
59 }
60 #if defined(CONFIG_SND_BF5XX_MULTICHAN_SUPPORT)
61 if (chan_mask & SP_SR) {
62 dst->ac97_sl = *src++;
63 dst->ac97_tag |= TAG_PCM_SL;
64 }
65 if (chan_mask & SP_SL) {
66 dst->ac97_sr = *src++;
67 dst->ac97_tag |= TAG_PCM_SR;
68 }
69 if (chan_mask & SP_LFE) {
70 dst->ac97_lfe = *src++;
71 dst->ac97_tag |= TAG_PCM_LFE;
72 }
73 if (chan_mask & SP_FC) {
74 dst->ac97_center = *src++;
75 dst->ac97_tag |= TAG_PCM_CENTER;
76 }
77 #endif
78 dst++;
79 }
80 }
81 EXPORT_SYMBOL(bf5xx_pcm_to_ac97);
82
bf5xx_ac97_to_pcm(const struct ac97_frame * src,__u16 * dst,size_t count)83 void bf5xx_ac97_to_pcm(const struct ac97_frame *src, __u16 *dst,
84 size_t count)
85 {
86 while (count--) {
87 *(dst++) = src->ac97_pcm_l;
88 *(dst++) = src->ac97_pcm_r;
89 src++;
90 }
91 }
92 EXPORT_SYMBOL(bf5xx_ac97_to_pcm);
93
sport_tx_curr_frag(struct sport_device * sport)94 static unsigned int sport_tx_curr_frag(struct sport_device *sport)
95 {
96 return sport->tx_curr_frag = sport_curr_offset_tx(sport) /
97 sport->tx_fragsize;
98 }
99
enqueue_cmd(struct snd_ac97 * ac97,__u16 addr,__u16 data)100 static void enqueue_cmd(struct snd_ac97 *ac97, __u16 addr, __u16 data)
101 {
102 struct sport_device *sport = ac97_sport_handle;
103 int *cmd_count = sport->private_data;
104 int nextfrag = sport_tx_curr_frag(sport);
105 struct ac97_frame *nextwrite;
106
107 sport_incfrag(sport, &nextfrag, 1);
108
109 nextwrite = (struct ac97_frame *)(sport->tx_buf +
110 nextfrag * sport->tx_fragsize);
111 pr_debug("sport->tx_buf:%p, nextfrag:0x%x nextwrite:%p, cmd_count:%d\n",
112 sport->tx_buf, nextfrag, nextwrite, cmd_count[nextfrag]);
113 nextwrite[cmd_count[nextfrag]].ac97_tag |= TAG_CMD;
114 nextwrite[cmd_count[nextfrag]].ac97_addr = addr;
115 nextwrite[cmd_count[nextfrag]].ac97_data = data;
116 ++cmd_count[nextfrag];
117 pr_debug("ac97_sport: Inserting %02x/%04x into fragment %d\n",
118 addr >> 8, data, nextfrag);
119 }
120
bf5xx_ac97_read(struct snd_ac97 * ac97,unsigned short reg)121 static unsigned short bf5xx_ac97_read(struct snd_ac97 *ac97,
122 unsigned short reg)
123 {
124 struct sport_device *sport_handle = ac97_sport_handle;
125 struct ac97_frame out_frame[2], in_frame[2];
126
127 pr_debug("%s enter 0x%x\n", __func__, reg);
128
129 /* When dma descriptor is enabled, the register should not be read */
130 if (sport_handle->tx_run || sport_handle->rx_run) {
131 pr_err("Could you send a mail to cliff.cai@analog.com "
132 "to report this?\n");
133 return -EFAULT;
134 }
135
136 memset(&out_frame, 0, 2 * sizeof(struct ac97_frame));
137 memset(&in_frame, 0, 2 * sizeof(struct ac97_frame));
138 out_frame[0].ac97_tag = TAG_VALID | TAG_CMD;
139 out_frame[0].ac97_addr = ((reg << 8) | 0x8000);
140 sport_send_and_recv(sport_handle, (unsigned char *)&out_frame,
141 (unsigned char *)&in_frame,
142 2 * sizeof(struct ac97_frame));
143 return in_frame[1].ac97_data;
144 }
145
bf5xx_ac97_write(struct snd_ac97 * ac97,unsigned short reg,unsigned short val)146 void bf5xx_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
147 unsigned short val)
148 {
149 struct sport_device *sport_handle = ac97_sport_handle;
150
151 pr_debug("%s enter 0x%x:0x%04x\n", __func__, reg, val);
152
153 if (sport_handle->tx_run) {
154 enqueue_cmd(ac97, (reg << 8), val); /* write */
155 enqueue_cmd(ac97, (reg << 8) | 0x8000, 0); /* read back */
156 } else {
157 struct ac97_frame frame;
158 memset(&frame, 0, sizeof(struct ac97_frame));
159 frame.ac97_tag = TAG_VALID | TAG_CMD;
160 frame.ac97_addr = (reg << 8);
161 frame.ac97_data = val;
162 sport_send_and_recv(sport_handle, (unsigned char *)&frame, \
163 NULL, sizeof(struct ac97_frame));
164 }
165 }
166
bf5xx_ac97_warm_reset(struct snd_ac97 * ac97)167 static void bf5xx_ac97_warm_reset(struct snd_ac97 *ac97)
168 {
169 struct sport_device *sport_handle = ac97_sport_handle;
170 u16 gpio = P_IDENT(sport_handle->pin_req[3]);
171
172 pr_debug("%s enter\n", __func__);
173
174 peripheral_free_list(sport_handle->pin_req);
175 gpio_request(gpio, "bf5xx-ac97");
176 gpio_direction_output(gpio, 1);
177 udelay(2);
178 gpio_set_value(gpio, 0);
179 udelay(1);
180 gpio_free(gpio);
181 peripheral_request_list(sport_handle->pin_req, "soc-audio");
182 }
183
bf5xx_ac97_cold_reset(struct snd_ac97 * ac97)184 static void bf5xx_ac97_cold_reset(struct snd_ac97 *ac97)
185 {
186 #ifdef CONFIG_SND_BF5XX_HAVE_COLD_RESET
187 pr_debug("%s enter\n", __func__);
188
189 /* It is specified for bf548-ezkit */
190 gpio_set_value(CONFIG_SND_BF5XX_RESET_GPIO_NUM, 0);
191 /* Keep reset pin low for 1 ms */
192 mdelay(1);
193 gpio_set_value(CONFIG_SND_BF5XX_RESET_GPIO_NUM, 1);
194 /* Wait for bit clock recover */
195 mdelay(1);
196 #else
197 pr_info("%s: Not implemented\n", __func__);
198 #endif
199 }
200
201 static struct snd_ac97_bus_ops bf5xx_ac97_ops = {
202 .read = bf5xx_ac97_read,
203 .write = bf5xx_ac97_write,
204 .warm_reset = bf5xx_ac97_warm_reset,
205 .reset = bf5xx_ac97_cold_reset,
206 };
207
208 #ifdef CONFIG_PM
bf5xx_ac97_suspend(struct snd_soc_dai * dai)209 static int bf5xx_ac97_suspend(struct snd_soc_dai *dai)
210 {
211 struct sport_device *sport = snd_soc_dai_get_drvdata(dai);
212
213 pr_debug("%s : sport %d\n", __func__, dai->id);
214 if (!dai->active)
215 return 0;
216 if (dai->capture_active)
217 sport_rx_stop(sport);
218 if (dai->playback_active)
219 sport_tx_stop(sport);
220 return 0;
221 }
222
bf5xx_ac97_resume(struct snd_soc_dai * dai)223 static int bf5xx_ac97_resume(struct snd_soc_dai *dai)
224 {
225 int ret;
226 struct sport_device *sport = snd_soc_dai_get_drvdata(dai);
227
228 pr_debug("%s : sport %d\n", __func__, dai->id);
229 if (!dai->active)
230 return 0;
231
232 #if defined(CONFIG_SND_BF5XX_MULTICHAN_SUPPORT)
233 ret = sport_set_multichannel(sport, 16, 0x3FF, 0x3FF, 1);
234 #else
235 ret = sport_set_multichannel(sport, 16, 0x1F, 0x1F, 1);
236 #endif
237 if (ret) {
238 pr_err("SPORT is busy!\n");
239 return -EBUSY;
240 }
241
242 ret = sport_config_rx(sport, IRFS, 0xF, 0, (16*16-1));
243 if (ret) {
244 pr_err("SPORT is busy!\n");
245 return -EBUSY;
246 }
247
248 ret = sport_config_tx(sport, ITFS, 0xF, 0, (16*16-1));
249 if (ret) {
250 pr_err("SPORT is busy!\n");
251 return -EBUSY;
252 }
253
254 return 0;
255 }
256
257 #else
258 #define bf5xx_ac97_suspend NULL
259 #define bf5xx_ac97_resume NULL
260 #endif
261
262 static struct snd_soc_dai_driver bfin_ac97_dai = {
263 .bus_control = true,
264 .suspend = bf5xx_ac97_suspend,
265 .resume = bf5xx_ac97_resume,
266 .playback = {
267 .stream_name = "AC97 Playback",
268 .channels_min = 2,
269 #if defined(CONFIG_SND_BF5XX_MULTICHAN_SUPPORT)
270 .channels_max = 6,
271 #else
272 .channels_max = 2,
273 #endif
274 .rates = SNDRV_PCM_RATE_48000,
275 .formats = SNDRV_PCM_FMTBIT_S16_LE, },
276 .capture = {
277 .stream_name = "AC97 Capture",
278 .channels_min = 2,
279 .channels_max = 2,
280 .rates = SNDRV_PCM_RATE_48000,
281 .formats = SNDRV_PCM_FMTBIT_S16_LE, },
282 };
283
284 static const struct snd_soc_component_driver bfin_ac97_component = {
285 .name = "bfin-ac97",
286 };
287
asoc_bfin_ac97_probe(struct platform_device * pdev)288 static int asoc_bfin_ac97_probe(struct platform_device *pdev)
289 {
290 struct sport_device *sport_handle;
291 int ret;
292
293 #ifdef CONFIG_SND_BF5XX_HAVE_COLD_RESET
294 /* Request PB3 as reset pin */
295 ret = devm_gpio_request_one(&pdev->dev,
296 CONFIG_SND_BF5XX_RESET_GPIO_NUM,
297 GPIOF_OUT_INIT_HIGH, "SND_AD198x RESET");
298 if (ret) {
299 dev_err(&pdev->dev,
300 "Failed to request GPIO_%d for reset: %d\n",
301 CONFIG_SND_BF5XX_RESET_GPIO_NUM, ret);
302 return ret;
303 }
304 #endif
305
306 sport_handle = sport_init(pdev, 2, sizeof(struct ac97_frame),
307 PAGE_SIZE);
308 if (!sport_handle) {
309 ret = -ENODEV;
310 goto sport_err;
311 }
312
313 /*SPORT works in TDM mode to simulate AC97 transfers*/
314 #if defined(CONFIG_SND_BF5XX_MULTICHAN_SUPPORT)
315 ret = sport_set_multichannel(sport_handle, 16, 0x3FF, 0x3FF, 1);
316 #else
317 ret = sport_set_multichannel(sport_handle, 16, 0x1F, 0x1F, 1);
318 #endif
319 if (ret) {
320 pr_err("SPORT is busy!\n");
321 ret = -EBUSY;
322 goto sport_config_err;
323 }
324
325 ret = sport_config_rx(sport_handle, IRFS, 0xF, 0, (16*16-1));
326 if (ret) {
327 pr_err("SPORT is busy!\n");
328 ret = -EBUSY;
329 goto sport_config_err;
330 }
331
332 ret = sport_config_tx(sport_handle, ITFS, 0xF, 0, (16*16-1));
333 if (ret) {
334 pr_err("SPORT is busy!\n");
335 ret = -EBUSY;
336 goto sport_config_err;
337 }
338
339 ret = snd_soc_set_ac97_ops(&bf5xx_ac97_ops);
340 if (ret != 0) {
341 dev_err(&pdev->dev, "Failed to set AC'97 ops: %d\n", ret);
342 goto sport_config_err;
343 }
344
345 ret = snd_soc_register_component(&pdev->dev, &bfin_ac97_component,
346 &bfin_ac97_dai, 1);
347 if (ret) {
348 pr_err("Failed to register DAI: %d\n", ret);
349 goto sport_config_err;
350 }
351
352 ac97_sport_handle = sport_handle;
353
354 return 0;
355
356 sport_config_err:
357 sport_done(sport_handle);
358 sport_err:
359 snd_soc_set_ac97_ops(NULL);
360
361 return ret;
362 }
363
asoc_bfin_ac97_remove(struct platform_device * pdev)364 static int asoc_bfin_ac97_remove(struct platform_device *pdev)
365 {
366 struct sport_device *sport_handle = platform_get_drvdata(pdev);
367
368 snd_soc_unregister_component(&pdev->dev);
369 sport_done(sport_handle);
370 snd_soc_set_ac97_ops(NULL);
371
372 return 0;
373 }
374
375 static struct platform_driver asoc_bfin_ac97_driver = {
376 .driver = {
377 .name = "bfin-ac97",
378 },
379
380 .probe = asoc_bfin_ac97_probe,
381 .remove = asoc_bfin_ac97_remove,
382 };
383
384 module_platform_driver(asoc_bfin_ac97_driver);
385
386 MODULE_AUTHOR("Roy Huang");
387 MODULE_DESCRIPTION("AC97 driver for ADI Blackfin");
388 MODULE_LICENSE("GPL");
389