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Linux/sound/soc/blackfin/bf5xx-ac97.c

  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 
 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 
 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 
 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 
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 
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 
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 
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 
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
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 
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         .ac97_control = 1,
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 
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 
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                         .owner = THIS_MODULE,
379         },
380 
381         .probe = asoc_bfin_ac97_probe,
382         .remove = asoc_bfin_ac97_remove,
383 };
384 
385 module_platform_driver(asoc_bfin_ac97_driver);
386 
387 MODULE_AUTHOR("Roy Huang");
388 MODULE_DESCRIPTION("AC97 driver for ADI Blackfin");
389 MODULE_LICENSE("GPL");
390 

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