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Linux/sound/soc/fsl/mpc8610_hpcd.c

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  1 /**
  2  * Freescale MPC8610HPCD ALSA SoC Fabric driver
  3  *
  4  * Author: Timur Tabi <timur@freescale.com>
  5  *
  6  * Copyright 2007-2008 Freescale Semiconductor, Inc.  This file is licensed
  7  * under the terms of the GNU General Public License version 2.  This
  8  * program is licensed "as is" without any warranty of any kind, whether
  9  * express or implied.
 10  */
 11 
 12 #include <linux/module.h>
 13 #include <linux/interrupt.h>
 14 #include <linux/of_device.h>
 15 #include <linux/of_platform.h>
 16 #include <sound/soc.h>
 17 #include <asm/immap_86xx.h>
 18 
 19 #include "../codecs/cs4270.h"
 20 #include "fsl_dma.h"
 21 #include "fsl_ssi.h"
 22 
 23 /**
 24  * mpc8610_hpcd_data: fabric-specific ASoC device data
 25  *
 26  * This structure contains data for a single sound platform device on an
 27  * MPC8610 HPCD.  Some of the data is taken from the device tree.
 28  */
 29 struct mpc8610_hpcd_data {
 30         struct snd_soc_device sound_devdata;
 31         struct snd_soc_dai_link dai;
 32         struct snd_soc_card machine;
 33         unsigned int dai_format;
 34         unsigned int codec_clk_direction;
 35         unsigned int cpu_clk_direction;
 36         unsigned int clk_frequency;
 37         struct ccsr_guts __iomem *guts;
 38         struct ccsr_ssi __iomem *ssi;
 39         unsigned int ssi_id;            /* 0 = SSI1, 1 = SSI2, etc */
 40         unsigned int ssi_irq;
 41         unsigned int dma_id;            /* 0 = DMA1, 1 = DMA2, etc */
 42         unsigned int dma_irq[2];
 43         struct ccsr_dma_channel __iomem *dma[2];
 44         unsigned int dma_channel_id[2]; /* 0 = ch 0, 1 = ch 1, etc*/
 45 };
 46 
 47 /**
 48  * mpc8610_hpcd_machine_probe: initalize the board
 49  *
 50  * This function is called when platform_device_add() is called.  It is used
 51  * to initialize the board-specific hardware.
 52  *
 53  * Here we program the DMACR and PMUXCR registers.
 54  */
 55 static int mpc8610_hpcd_machine_probe(struct platform_device *sound_device)
 56 {
 57         struct mpc8610_hpcd_data *machine_data =
 58                 sound_device->dev.platform_data;
 59 
 60         /* Program the signal routing between the SSI and the DMA */
 61         guts_set_dmacr(machine_data->guts, machine_data->dma_id,
 62                 machine_data->dma_channel_id[0], CCSR_GUTS_DMACR_DEV_SSI);
 63         guts_set_dmacr(machine_data->guts, machine_data->dma_id,
 64                 machine_data->dma_channel_id[1], CCSR_GUTS_DMACR_DEV_SSI);
 65 
 66         guts_set_pmuxcr_dma(machine_data->guts, machine_data->dma_id,
 67                 machine_data->dma_channel_id[0], 0);
 68         guts_set_pmuxcr_dma(machine_data->guts, machine_data->dma_id,
 69                 machine_data->dma_channel_id[1], 0);
 70 
 71         switch (machine_data->ssi_id) {
 72         case 0:
 73                 clrsetbits_be32(&machine_data->guts->pmuxcr,
 74                         CCSR_GUTS_PMUXCR_SSI1_MASK, CCSR_GUTS_PMUXCR_SSI1_SSI);
 75                 break;
 76         case 1:
 77                 clrsetbits_be32(&machine_data->guts->pmuxcr,
 78                         CCSR_GUTS_PMUXCR_SSI2_MASK, CCSR_GUTS_PMUXCR_SSI2_SSI);
 79                 break;
 80         }
 81 
 82         return 0;
 83 }
 84 
 85 /**
 86  * mpc8610_hpcd_startup: program the board with various hardware parameters
 87  *
 88  * This function takes board-specific information, like clock frequencies
 89  * and serial data formats, and passes that information to the codec and
 90  * transport drivers.
 91  */
 92 static int mpc8610_hpcd_startup(struct snd_pcm_substream *substream)
 93 {
 94         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 95         struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;
 96         struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
 97         struct mpc8610_hpcd_data *machine_data =
 98                 rtd->socdev->dev->platform_data;
 99         int ret = 0;
100 
101         /* Tell the CPU driver what the serial protocol is. */
102         ret = snd_soc_dai_set_fmt(cpu_dai, machine_data->dai_format);
103         if (ret < 0) {
104                 dev_err(substream->pcm->card->dev,
105                         "could not set CPU driver audio format\n");
106                 return ret;
107         }
108 
109         /* Tell the codec driver what the serial protocol is. */
110         ret = snd_soc_dai_set_fmt(codec_dai, machine_data->dai_format);
111         if (ret < 0) {
112                 dev_err(substream->pcm->card->dev,
113                         "could not set codec driver audio format\n");
114                 return ret;
115         }
116 
117         /*
118          * Tell the CPU driver what the clock frequency is, and whether it's a
119          * slave or master.
120          */
121         ret = snd_soc_dai_set_sysclk(cpu_dai, 0,
122                                         machine_data->clk_frequency,
123                                         machine_data->cpu_clk_direction);
124         if (ret < 0) {
125                 dev_err(substream->pcm->card->dev,
126                         "could not set CPU driver clock parameters\n");
127                 return ret;
128         }
129 
130         /*
131          * Tell the codec driver what the MCLK frequency is, and whether it's
132          * a slave or master.
133          */
134         ret = snd_soc_dai_set_sysclk(codec_dai, 0,
135                                         machine_data->clk_frequency,
136                                         machine_data->codec_clk_direction);
137         if (ret < 0) {
138                 dev_err(substream->pcm->card->dev,
139                         "could not set codec driver clock params\n");
140                 return ret;
141         }
142 
143         return 0;
144 }
145 
146 /**
147  * mpc8610_hpcd_machine_remove: Remove the sound device
148  *
149  * This function is called to remove the sound device for one SSI.  We
150  * de-program the DMACR and PMUXCR register.
151  */
152 int mpc8610_hpcd_machine_remove(struct platform_device *sound_device)
153 {
154         struct mpc8610_hpcd_data *machine_data =
155                 sound_device->dev.platform_data;
156 
157         /* Restore the signal routing */
158 
159         guts_set_dmacr(machine_data->guts, machine_data->dma_id,
160                 machine_data->dma_channel_id[0], 0);
161         guts_set_dmacr(machine_data->guts, machine_data->dma_id,
162                 machine_data->dma_channel_id[1], 0);
163 
164         switch (machine_data->ssi_id) {
165         case 0:
166                 clrsetbits_be32(&machine_data->guts->pmuxcr,
167                         CCSR_GUTS_PMUXCR_SSI1_MASK, CCSR_GUTS_PMUXCR_SSI1_LA);
168                 break;
169         case 1:
170                 clrsetbits_be32(&machine_data->guts->pmuxcr,
171                         CCSR_GUTS_PMUXCR_SSI2_MASK, CCSR_GUTS_PMUXCR_SSI2_LA);
172                 break;
173         }
174 
175         return 0;
176 }
177 
178 /**
179  * mpc8610_hpcd_ops: ASoC fabric driver operations
180  */
181 static struct snd_soc_ops mpc8610_hpcd_ops = {
182         .startup = mpc8610_hpcd_startup,
183 };
184 
185 /**
186  * mpc8610_hpcd_probe: OF probe function for the fabric driver
187  *
188  * This function gets called when an SSI node is found in the device tree.
189  *
190  * Although this is a fabric driver, the SSI node is the "master" node with
191  * respect to audio hardware connections.  Therefore, we create a new ASoC
192  * device for each new SSI node that has a codec attached.
193  *
194  * FIXME: Currently, we only support one DMA controller, so if there are
195  * multiple SSI nodes with codecs, only the first will be supported.
196  *
197  * FIXME: Even if we did support multiple DMA controllers, we have no
198  * mechanism for assigning DMA controllers and channels to the individual
199  * SSI devices.  We also probably aren't compatible with the generic Elo DMA
200  * device driver.
201  */
202 static int mpc8610_hpcd_probe(struct of_device *ofdev,
203         const struct of_device_id *match)
204 {
205         struct device_node *np = ofdev->node;
206         struct device_node *codec_np = NULL;
207         struct device_node *guts_np = NULL;
208         struct device_node *dma_np = NULL;
209         struct device_node *dma_channel_np = NULL;
210         const phandle *codec_ph;
211         const char *sprop;
212         const u32 *iprop;
213         struct resource res;
214         struct platform_device *sound_device = NULL;
215         struct mpc8610_hpcd_data *machine_data;
216         struct fsl_ssi_info ssi_info;
217         struct fsl_dma_info dma_info;
218         int ret = -ENODEV;
219         unsigned int playback_dma_channel;
220         unsigned int capture_dma_channel;
221 
222         machine_data = kzalloc(sizeof(struct mpc8610_hpcd_data), GFP_KERNEL);
223         if (!machine_data)
224                 return -ENOMEM;
225 
226         memset(&ssi_info, 0, sizeof(ssi_info));
227         memset(&dma_info, 0, sizeof(dma_info));
228 
229         ssi_info.dev = &ofdev->dev;
230 
231         /*
232          * We are only interested in SSIs with a codec phandle in them, so let's
233          * make sure this SSI has one.
234          */
235         codec_ph = of_get_property(np, "codec-handle", NULL);
236         if (!codec_ph)
237                 goto error;
238 
239         codec_np = of_find_node_by_phandle(*codec_ph);
240         if (!codec_np)
241                 goto error;
242 
243         /* The MPC8610 HPCD only knows about the CS4270 codec, so reject
244            anything else. */
245         if (!of_device_is_compatible(codec_np, "cirrus,cs4270"))
246                 goto error;
247 
248         /* Get the device ID */
249         iprop = of_get_property(np, "cell-index", NULL);
250         if (!iprop) {
251                 dev_err(&ofdev->dev, "cell-index property not found\n");
252                 ret = -EINVAL;
253                 goto error;
254         }
255         machine_data->ssi_id = *iprop;
256         ssi_info.id = *iprop;
257 
258         /* Get the serial format and clock direction. */
259         sprop = of_get_property(np, "fsl,mode", NULL);
260         if (!sprop) {
261                 dev_err(&ofdev->dev, "fsl,mode property not found\n");
262                 ret = -EINVAL;
263                 goto error;
264         }
265 
266         if (strcasecmp(sprop, "i2s-slave") == 0) {
267                 machine_data->dai_format = SND_SOC_DAIFMT_I2S;
268                 machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
269                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;
270 
271                 /*
272                  * In i2s-slave mode, the codec has its own clock source, so we
273                  * need to get the frequency from the device tree and pass it to
274                  * the codec driver.
275                  */
276                 iprop = of_get_property(codec_np, "clock-frequency", NULL);
277                 if (!iprop || !*iprop) {
278                         dev_err(&ofdev->dev, "codec bus-frequency property "
279                                 "is missing or invalid\n");
280                         ret = -EINVAL;
281                         goto error;
282                 }
283                 machine_data->clk_frequency = *iprop;
284         } else if (strcasecmp(sprop, "i2s-master") == 0) {
285                 machine_data->dai_format = SND_SOC_DAIFMT_I2S;
286                 machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
287                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
288         } else if (strcasecmp(sprop, "lj-slave") == 0) {
289                 machine_data->dai_format = SND_SOC_DAIFMT_LEFT_J;
290                 machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
291                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;
292         } else if (strcasecmp(sprop, "lj-master") == 0) {
293                 machine_data->dai_format = SND_SOC_DAIFMT_LEFT_J;
294                 machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
295                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
296         } else if (strcasecmp(sprop, "rj-slave") == 0) {
297                 machine_data->dai_format = SND_SOC_DAIFMT_RIGHT_J;
298                 machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
299                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;
300         } else if (strcasecmp(sprop, "rj-master") == 0) {
301                 machine_data->dai_format = SND_SOC_DAIFMT_RIGHT_J;
302                 machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
303                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
304         } else if (strcasecmp(sprop, "ac97-slave") == 0) {
305                 machine_data->dai_format = SND_SOC_DAIFMT_AC97;
306                 machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
307                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;
308         } else if (strcasecmp(sprop, "ac97-master") == 0) {
309                 machine_data->dai_format = SND_SOC_DAIFMT_AC97;
310                 machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
311                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
312         } else {
313                 dev_err(&ofdev->dev,
314                         "unrecognized fsl,mode property \"%s\"\n", sprop);
315                 ret = -EINVAL;
316                 goto error;
317         }
318 
319         if (!machine_data->clk_frequency) {
320                 dev_err(&ofdev->dev, "unknown clock frequency\n");
321                 ret = -EINVAL;
322                 goto error;
323         }
324 
325         /* Read the SSI information from the device tree */
326         ret = of_address_to_resource(np, 0, &res);
327         if (ret) {
328                 dev_err(&ofdev->dev, "could not obtain SSI address\n");
329                 goto error;
330         }
331         if (!res.start) {
332                 dev_err(&ofdev->dev, "invalid SSI address\n");
333                 goto error;
334         }
335         ssi_info.ssi_phys = res.start;
336 
337         machine_data->ssi = ioremap(ssi_info.ssi_phys, sizeof(struct ccsr_ssi));
338         if (!machine_data->ssi) {
339                 dev_err(&ofdev->dev, "could not map SSI address %x\n",
340                         ssi_info.ssi_phys);
341                 ret = -EINVAL;
342                 goto error;
343         }
344         ssi_info.ssi = machine_data->ssi;
345 
346 
347         /* Get the IRQ of the SSI */
348         machine_data->ssi_irq = irq_of_parse_and_map(np, 0);
349         if (!machine_data->ssi_irq) {
350                 dev_err(&ofdev->dev, "could not get SSI IRQ\n");
351                 ret = -EINVAL;
352                 goto error;
353         }
354         ssi_info.irq = machine_data->ssi_irq;
355 
356         /* Do we want to use asynchronous mode? */
357         ssi_info.asynchronous =
358                 of_find_property(np, "fsl,ssi-asynchronous", NULL) ? 1 : 0;
359         if (ssi_info.asynchronous)
360                 dev_info(&ofdev->dev, "using asynchronous mode\n");
361 
362         /* Map the global utilities registers. */
363         guts_np = of_find_compatible_node(NULL, NULL, "fsl,mpc8610-guts");
364         if (!guts_np) {
365                 dev_err(&ofdev->dev, "could not obtain address of GUTS\n");
366                 ret = -EINVAL;
367                 goto error;
368         }
369         machine_data->guts = of_iomap(guts_np, 0);
370         of_node_put(guts_np);
371         if (!machine_data->guts) {
372                 dev_err(&ofdev->dev, "could not map GUTS\n");
373                 ret = -EINVAL;
374                 goto error;
375         }
376 
377         /* Find the DMA channels to use.  Both SSIs need to use the same DMA
378          * controller, so let's use DMA#1.
379          */
380         for_each_compatible_node(dma_np, NULL, "fsl,mpc8610-dma") {
381                 iprop = of_get_property(dma_np, "cell-index", NULL);
382                 if (iprop && (*iprop == 0)) {
383                         of_node_put(dma_np);
384                         break;
385                 }
386         }
387         if (!dma_np) {
388                 dev_err(&ofdev->dev, "could not find DMA node\n");
389                 ret = -EINVAL;
390                 goto error;
391         }
392         machine_data->dma_id = *iprop;
393 
394         /* SSI1 needs to use DMA Channels 0 and 1, and SSI2 needs to use DMA
395          * channels 2 and 3.  This is just how the MPC8610 is wired
396          * internally.
397          */
398         playback_dma_channel = (machine_data->ssi_id == 0) ? 0 : 2;
399         capture_dma_channel = (machine_data->ssi_id == 0) ? 1 : 3;
400 
401         /*
402          * Find the DMA channels to use.
403          */
404         while ((dma_channel_np = of_get_next_child(dma_np, dma_channel_np))) {
405                 iprop = of_get_property(dma_channel_np, "cell-index", NULL);
406                 if (iprop && (*iprop == playback_dma_channel)) {
407                         /* dma_channel[0] and dma_irq[0] are for playback */
408                         dma_info.dma_channel[0] = of_iomap(dma_channel_np, 0);
409                         dma_info.dma_irq[0] =
410                                 irq_of_parse_and_map(dma_channel_np, 0);
411                         machine_data->dma_channel_id[0] = *iprop;
412                         continue;
413                 }
414                 if (iprop && (*iprop == capture_dma_channel)) {
415                         /* dma_channel[1] and dma_irq[1] are for capture */
416                         dma_info.dma_channel[1] = of_iomap(dma_channel_np, 0);
417                         dma_info.dma_irq[1] =
418                                 irq_of_parse_and_map(dma_channel_np, 0);
419                         machine_data->dma_channel_id[1] = *iprop;
420                         continue;
421                 }
422         }
423         if (!dma_info.dma_channel[0] || !dma_info.dma_channel[1] ||
424             !dma_info.dma_irq[0] || !dma_info.dma_irq[1]) {
425                 dev_err(&ofdev->dev, "could not find DMA channels\n");
426                 ret = -EINVAL;
427                 goto error;
428         }
429 
430         dma_info.ssi_stx_phys = ssi_info.ssi_phys +
431                 offsetof(struct ccsr_ssi, stx0);
432         dma_info.ssi_srx_phys = ssi_info.ssi_phys +
433                 offsetof(struct ccsr_ssi, srx0);
434 
435         /* We have the DMA information, so tell the DMA driver what it is */
436         if (!fsl_dma_configure(&dma_info)) {
437                 dev_err(&ofdev->dev, "could not instantiate DMA device\n");
438                 ret = -EBUSY;
439                 goto error;
440         }
441 
442         /*
443          * Initialize our DAI data structure.  We should probably get this
444          * information from the device tree.
445          */
446         machine_data->dai.name = "CS4270";
447         machine_data->dai.stream_name = "CS4270";
448 
449         machine_data->dai.cpu_dai = fsl_ssi_create_dai(&ssi_info);
450         machine_data->dai.codec_dai = &cs4270_dai; /* The codec_dai we want */
451         machine_data->dai.ops = &mpc8610_hpcd_ops;
452 
453         machine_data->machine.probe = mpc8610_hpcd_machine_probe;
454         machine_data->machine.remove = mpc8610_hpcd_machine_remove;
455         machine_data->machine.name = "MPC8610 HPCD";
456         machine_data->machine.num_links = 1;
457         machine_data->machine.dai_link = &machine_data->dai;
458 
459         /* Allocate a new audio platform device structure */
460         sound_device = platform_device_alloc("soc-audio", -1);
461         if (!sound_device) {
462                 dev_err(&ofdev->dev, "platform device allocation failed\n");
463                 ret = -ENOMEM;
464                 goto error;
465         }
466 
467         machine_data->sound_devdata.card = &machine_data->machine;
468         machine_data->sound_devdata.codec_dev = &soc_codec_device_cs4270;
469         machine_data->machine.platform = &fsl_soc_platform;
470 
471         sound_device->dev.platform_data = machine_data;
472 
473 
474         /* Set the platform device and ASoC device to point to each other */
475         platform_set_drvdata(sound_device, &machine_data->sound_devdata);
476 
477         machine_data->sound_devdata.dev = &sound_device->dev;
478 
479 
480         /* Tell ASoC to probe us.  This will call mpc8610_hpcd_machine.probe(),
481            if it exists. */
482         ret = platform_device_add(sound_device);
483 
484         if (ret) {
485                 dev_err(&ofdev->dev, "platform device add failed\n");
486                 goto error;
487         }
488 
489         dev_set_drvdata(&ofdev->dev, sound_device);
490 
491         return 0;
492 
493 error:
494         of_node_put(codec_np);
495         of_node_put(guts_np);
496         of_node_put(dma_np);
497         of_node_put(dma_channel_np);
498 
499         if (sound_device)
500                 platform_device_unregister(sound_device);
501 
502         if (machine_data->dai.cpu_dai)
503                 fsl_ssi_destroy_dai(machine_data->dai.cpu_dai);
504 
505         if (ssi_info.ssi)
506                 iounmap(ssi_info.ssi);
507 
508         if (ssi_info.irq)
509                 irq_dispose_mapping(ssi_info.irq);
510 
511         if (dma_info.dma_channel[0])
512                 iounmap(dma_info.dma_channel[0]);
513 
514         if (dma_info.dma_channel[1])
515                 iounmap(dma_info.dma_channel[1]);
516 
517         if (dma_info.dma_irq[0])
518                 irq_dispose_mapping(dma_info.dma_irq[0]);
519 
520         if (dma_info.dma_irq[1])
521                 irq_dispose_mapping(dma_info.dma_irq[1]);
522 
523         if (machine_data->guts)
524                 iounmap(machine_data->guts);
525 
526         kfree(machine_data);
527 
528         return ret;
529 }
530 
531 /**
532  * mpc8610_hpcd_remove: remove the OF device
533  *
534  * This function is called when the OF device is removed.
535  */
536 static int mpc8610_hpcd_remove(struct of_device *ofdev)
537 {
538         struct platform_device *sound_device = dev_get_drvdata(&ofdev->dev);
539         struct mpc8610_hpcd_data *machine_data =
540                 sound_device->dev.platform_data;
541 
542         platform_device_unregister(sound_device);
543 
544         if (machine_data->dai.cpu_dai)
545                 fsl_ssi_destroy_dai(machine_data->dai.cpu_dai);
546 
547         if (machine_data->ssi)
548                 iounmap(machine_data->ssi);
549 
550         if (machine_data->dma[0])
551                 iounmap(machine_data->dma[0]);
552 
553         if (machine_data->dma[1])
554                 iounmap(machine_data->dma[1]);
555 
556         if (machine_data->dma_irq[0])
557                 irq_dispose_mapping(machine_data->dma_irq[0]);
558 
559         if (machine_data->dma_irq[1])
560                 irq_dispose_mapping(machine_data->dma_irq[1]);
561 
562         if (machine_data->guts)
563                 iounmap(machine_data->guts);
564 
565         kfree(machine_data);
566         sound_device->dev.platform_data = NULL;
567 
568         dev_set_drvdata(&ofdev->dev, NULL);
569 
570         return 0;
571 }
572 
573 static struct of_device_id mpc8610_hpcd_match[] = {
574         {
575                 .compatible = "fsl,mpc8610-ssi",
576         },
577         {}
578 };
579 MODULE_DEVICE_TABLE(of, mpc8610_hpcd_match);
580 
581 static struct of_platform_driver mpc8610_hpcd_of_driver = {
582         .owner          = THIS_MODULE,
583         .name           = "mpc8610_hpcd",
584         .match_table    = mpc8610_hpcd_match,
585         .probe          = mpc8610_hpcd_probe,
586         .remove         = mpc8610_hpcd_remove,
587 };
588 
589 /**
590  * mpc8610_hpcd_init: fabric driver initialization.
591  *
592  * This function is called when this module is loaded.
593  */
594 static int __init mpc8610_hpcd_init(void)
595 {
596         int ret;
597 
598         printk(KERN_INFO "Freescale MPC8610 HPCD ALSA SoC fabric driver\n");
599 
600         ret = of_register_platform_driver(&mpc8610_hpcd_of_driver);
601 
602         if (ret)
603                 printk(KERN_ERR
604                         "mpc8610-hpcd: failed to register platform driver\n");
605 
606         return ret;
607 }
608 
609 /**
610  * mpc8610_hpcd_exit: fabric driver exit
611  *
612  * This function is called when this driver is unloaded.
613  */
614 static void __exit mpc8610_hpcd_exit(void)
615 {
616         of_unregister_platform_driver(&mpc8610_hpcd_of_driver);
617 }
618 
619 module_init(mpc8610_hpcd_init);
620 module_exit(mpc8610_hpcd_exit);
621 
622 MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
623 MODULE_DESCRIPTION("Freescale MPC8610 HPCD ALSA SoC fabric driver");
624 MODULE_LICENSE("GPL");
625 

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