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Linux/sound/soc/fsl/mpc8610_hpcd.c

  1 /**
  2  * Freescale MPC8610HPCD ALSA SoC Machine driver
  3  *
  4  * Author: Timur Tabi <timur@freescale.com>
  5  *
  6  * Copyright 2007-2010 Freescale Semiconductor, Inc.
  7  *
  8  * This file is licensed under the terms of the GNU General Public License
  9  * version 2.  This program is licensed "as is" without any warranty of any
 10  * kind, whether express or implied.
 11  */
 12 
 13 #include <linux/module.h>
 14 #include <linux/interrupt.h>
 15 #include <linux/fsl/guts.h>
 16 #include <linux/of_address.h>
 17 #include <linux/of_device.h>
 18 #include <linux/slab.h>
 19 #include <sound/soc.h>
 20 
 21 #include "fsl_dma.h"
 22 #include "fsl_ssi.h"
 23 #include "fsl_utils.h"
 24 
 25 /* There's only one global utilities register */
 26 static phys_addr_t guts_phys;
 27 
 28 /**
 29  * mpc8610_hpcd_data: machine-specific ASoC device data
 30  *
 31  * This structure contains data for a single sound platform device on an
 32  * MPC8610 HPCD.  Some of the data is taken from the device tree.
 33  */
 34 struct mpc8610_hpcd_data {
 35         struct snd_soc_dai_link dai[2];
 36         struct snd_soc_card card;
 37         unsigned int dai_format;
 38         unsigned int codec_clk_direction;
 39         unsigned int cpu_clk_direction;
 40         unsigned int clk_frequency;
 41         unsigned int ssi_id;            /* 0 = SSI1, 1 = SSI2, etc */
 42         unsigned int dma_id[2];         /* 0 = DMA1, 1 = DMA2, etc */
 43         unsigned int dma_channel_id[2]; /* 0 = ch 0, 1 = ch 1, etc*/
 44         char codec_dai_name[DAI_NAME_SIZE];
 45         char platform_name[2][DAI_NAME_SIZE]; /* One for each DMA channel */
 46 };
 47 
 48 /**
 49  * mpc8610_hpcd_machine_probe: initialize the board
 50  *
 51  * This function is used 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 snd_soc_card *card)
 56 {
 57         struct mpc8610_hpcd_data *machine_data =
 58                 container_of(card, struct mpc8610_hpcd_data, card);
 59         struct ccsr_guts __iomem *guts;
 60 
 61         guts = ioremap(guts_phys, sizeof(struct ccsr_guts));
 62         if (!guts) {
 63                 dev_err(card->dev, "could not map global utilities\n");
 64                 return -ENOMEM;
 65         }
 66 
 67         /* Program the signal routing between the SSI and the DMA */
 68         guts_set_dmacr(guts, machine_data->dma_id[0],
 69                        machine_data->dma_channel_id[0],
 70                        CCSR_GUTS_DMACR_DEV_SSI);
 71         guts_set_dmacr(guts, machine_data->dma_id[1],
 72                        machine_data->dma_channel_id[1],
 73                        CCSR_GUTS_DMACR_DEV_SSI);
 74 
 75         guts_set_pmuxcr_dma(guts, machine_data->dma_id[0],
 76                             machine_data->dma_channel_id[0], 0);
 77         guts_set_pmuxcr_dma(guts, machine_data->dma_id[1],
 78                             machine_data->dma_channel_id[1], 0);
 79 
 80         switch (machine_data->ssi_id) {
 81         case 0:
 82                 clrsetbits_be32(&guts->pmuxcr,
 83                         CCSR_GUTS_PMUXCR_SSI1_MASK, CCSR_GUTS_PMUXCR_SSI1_SSI);
 84                 break;
 85         case 1:
 86                 clrsetbits_be32(&guts->pmuxcr,
 87                         CCSR_GUTS_PMUXCR_SSI2_MASK, CCSR_GUTS_PMUXCR_SSI2_SSI);
 88                 break;
 89         }
 90 
 91         iounmap(guts);
 92 
 93         return 0;
 94 }
 95 
 96 /**
 97  * mpc8610_hpcd_startup: program the board with various hardware parameters
 98  *
 99  * This function takes board-specific information, like clock frequencies
100  * and serial data formats, and passes that information to the codec and
101  * transport drivers.
102  */
103 static int mpc8610_hpcd_startup(struct snd_pcm_substream *substream)
104 {
105         struct snd_soc_pcm_runtime *rtd = substream->private_data;
106         struct mpc8610_hpcd_data *machine_data =
107                 container_of(rtd->card, struct mpc8610_hpcd_data, card);
108         struct device *dev = rtd->card->dev;
109         int ret = 0;
110 
111         /* Tell the codec driver what the serial protocol is. */
112         ret = snd_soc_dai_set_fmt(rtd->codec_dai, machine_data->dai_format);
113         if (ret < 0) {
114                 dev_err(dev, "could not set codec driver audio format\n");
115                 return ret;
116         }
117 
118         /*
119          * Tell the codec driver what the MCLK frequency is, and whether it's
120          * a slave or master.
121          */
122         ret = snd_soc_dai_set_sysclk(rtd->codec_dai, 0,
123                                      machine_data->clk_frequency,
124                                      machine_data->codec_clk_direction);
125         if (ret < 0) {
126                 dev_err(dev, "could not set codec driver clock params\n");
127                 return ret;
128         }
129 
130         return 0;
131 }
132 
133 /**
134  * mpc8610_hpcd_machine_remove: Remove the sound device
135  *
136  * This function is called to remove the sound device for one SSI.  We
137  * de-program the DMACR and PMUXCR register.
138  */
139 static int mpc8610_hpcd_machine_remove(struct snd_soc_card *card)
140 {
141         struct mpc8610_hpcd_data *machine_data =
142                 container_of(card, struct mpc8610_hpcd_data, card);
143         struct ccsr_guts __iomem *guts;
144 
145         guts = ioremap(guts_phys, sizeof(struct ccsr_guts));
146         if (!guts) {
147                 dev_err(card->dev, "could not map global utilities\n");
148                 return -ENOMEM;
149         }
150 
151         /* Restore the signal routing */
152 
153         guts_set_dmacr(guts, machine_data->dma_id[0],
154                        machine_data->dma_channel_id[0], 0);
155         guts_set_dmacr(guts, machine_data->dma_id[1],
156                        machine_data->dma_channel_id[1], 0);
157 
158         switch (machine_data->ssi_id) {
159         case 0:
160                 clrsetbits_be32(&guts->pmuxcr,
161                         CCSR_GUTS_PMUXCR_SSI1_MASK, CCSR_GUTS_PMUXCR_SSI1_LA);
162                 break;
163         case 1:
164                 clrsetbits_be32(&guts->pmuxcr,
165                         CCSR_GUTS_PMUXCR_SSI2_MASK, CCSR_GUTS_PMUXCR_SSI2_LA);
166                 break;
167         }
168 
169         iounmap(guts);
170 
171         return 0;
172 }
173 
174 /**
175  * mpc8610_hpcd_ops: ASoC machine driver operations
176  */
177 static struct snd_soc_ops mpc8610_hpcd_ops = {
178         .startup = mpc8610_hpcd_startup,
179 };
180 
181 /**
182  * mpc8610_hpcd_probe: platform probe function for the machine driver
183  *
184  * Although this is a machine driver, the SSI node is the "master" node with
185  * respect to audio hardware connections.  Therefore, we create a new ASoC
186  * device for each new SSI node that has a codec attached.
187  */
188 static int mpc8610_hpcd_probe(struct platform_device *pdev)
189 {
190         struct device *dev = pdev->dev.parent;
191         /* ssi_pdev is the platform device for the SSI node that probed us */
192         struct platform_device *ssi_pdev = to_platform_device(dev);
193         struct device_node *np = ssi_pdev->dev.of_node;
194         struct device_node *codec_np = NULL;
195         struct mpc8610_hpcd_data *machine_data;
196         int ret = -ENODEV;
197         const char *sprop;
198         const u32 *iprop;
199 
200         /* Find the codec node for this SSI. */
201         codec_np = of_parse_phandle(np, "codec-handle", 0);
202         if (!codec_np) {
203                 dev_err(dev, "invalid codec node\n");
204                 return -EINVAL;
205         }
206 
207         machine_data = kzalloc(sizeof(struct mpc8610_hpcd_data), GFP_KERNEL);
208         if (!machine_data) {
209                 ret = -ENOMEM;
210                 goto error_alloc;
211         }
212 
213         machine_data->dai[0].cpu_dai_name = dev_name(&ssi_pdev->dev);
214         machine_data->dai[0].ops = &mpc8610_hpcd_ops;
215 
216         /* ASoC core can match codec with device node */
217         machine_data->dai[0].codec_of_node = codec_np;
218 
219         /* The DAI name from the codec (snd_soc_dai_driver.name) */
220         machine_data->dai[0].codec_dai_name = "cs4270-hifi";
221 
222         /* We register two DAIs per SSI, one for playback and the other for
223          * capture.  Currently, we only support codecs that have one DAI for
224          * both playback and capture.
225          */
226         memcpy(&machine_data->dai[1], &machine_data->dai[0],
227                sizeof(struct snd_soc_dai_link));
228 
229         /* Get the device ID */
230         iprop = of_get_property(np, "cell-index", NULL);
231         if (!iprop) {
232                 dev_err(&pdev->dev, "cell-index property not found\n");
233                 ret = -EINVAL;
234                 goto error;
235         }
236         machine_data->ssi_id = be32_to_cpup(iprop);
237 
238         /* Get the serial format and clock direction. */
239         sprop = of_get_property(np, "fsl,mode", NULL);
240         if (!sprop) {
241                 dev_err(&pdev->dev, "fsl,mode property not found\n");
242                 ret = -EINVAL;
243                 goto error;
244         }
245 
246         if (strcasecmp(sprop, "i2s-slave") == 0) {
247                 machine_data->dai_format =
248                         SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM;
249                 machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
250                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;
251 
252                 /* In i2s-slave mode, the codec has its own clock source, so we
253                  * need to get the frequency from the device tree and pass it to
254                  * the codec driver.
255                  */
256                 iprop = of_get_property(codec_np, "clock-frequency", NULL);
257                 if (!iprop || !*iprop) {
258                         dev_err(&pdev->dev, "codec bus-frequency "
259                                 "property is missing or invalid\n");
260                         ret = -EINVAL;
261                         goto error;
262                 }
263                 machine_data->clk_frequency = be32_to_cpup(iprop);
264         } else if (strcasecmp(sprop, "i2s-master") == 0) {
265                 machine_data->dai_format =
266                         SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS;
267                 machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
268                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
269         } else if (strcasecmp(sprop, "lj-slave") == 0) {
270                 machine_data->dai_format =
271                         SND_SOC_DAIFMT_LEFT_J | SND_SOC_DAIFMT_CBM_CFM;
272                 machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
273                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;
274         } else if (strcasecmp(sprop, "lj-master") == 0) {
275                 machine_data->dai_format =
276                         SND_SOC_DAIFMT_LEFT_J | SND_SOC_DAIFMT_CBS_CFS;
277                 machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
278                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
279         } else if (strcasecmp(sprop, "rj-slave") == 0) {
280                 machine_data->dai_format =
281                         SND_SOC_DAIFMT_RIGHT_J | SND_SOC_DAIFMT_CBM_CFM;
282                 machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
283                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;
284         } else if (strcasecmp(sprop, "rj-master") == 0) {
285                 machine_data->dai_format =
286                         SND_SOC_DAIFMT_RIGHT_J | SND_SOC_DAIFMT_CBS_CFS;
287                 machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
288                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
289         } else if (strcasecmp(sprop, "ac97-slave") == 0) {
290                 machine_data->dai_format =
291                         SND_SOC_DAIFMT_AC97 | SND_SOC_DAIFMT_CBM_CFM;
292                 machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
293                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;
294         } else if (strcasecmp(sprop, "ac97-master") == 0) {
295                 machine_data->dai_format =
296                         SND_SOC_DAIFMT_AC97 | SND_SOC_DAIFMT_CBS_CFS;
297                 machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
298                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
299         } else {
300                 dev_err(&pdev->dev,
301                         "unrecognized fsl,mode property '%s'\n", sprop);
302                 ret = -EINVAL;
303                 goto error;
304         }
305 
306         if (!machine_data->clk_frequency) {
307                 dev_err(&pdev->dev, "unknown clock frequency\n");
308                 ret = -EINVAL;
309                 goto error;
310         }
311 
312         /* Find the playback DMA channel to use. */
313         machine_data->dai[0].platform_name = machine_data->platform_name[0];
314         ret = fsl_asoc_get_dma_channel(np, "fsl,playback-dma",
315                                        &machine_data->dai[0],
316                                        &machine_data->dma_channel_id[0],
317                                        &machine_data->dma_id[0]);
318         if (ret) {
319                 dev_err(&pdev->dev, "missing/invalid playback DMA phandle\n");
320                 goto error;
321         }
322 
323         /* Find the capture DMA channel to use. */
324         machine_data->dai[1].platform_name = machine_data->platform_name[1];
325         ret = fsl_asoc_get_dma_channel(np, "fsl,capture-dma",
326                                        &machine_data->dai[1],
327                                        &machine_data->dma_channel_id[1],
328                                        &machine_data->dma_id[1]);
329         if (ret) {
330                 dev_err(&pdev->dev, "missing/invalid capture DMA phandle\n");
331                 goto error;
332         }
333 
334         /* Initialize our DAI data structure.  */
335         machine_data->dai[0].stream_name = "playback";
336         machine_data->dai[1].stream_name = "capture";
337         machine_data->dai[0].name = machine_data->dai[0].stream_name;
338         machine_data->dai[1].name = machine_data->dai[1].stream_name;
339 
340         machine_data->card.probe = mpc8610_hpcd_machine_probe;
341         machine_data->card.remove = mpc8610_hpcd_machine_remove;
342         machine_data->card.name = pdev->name; /* The platform driver name */
343         machine_data->card.owner = THIS_MODULE;
344         machine_data->card.dev = &pdev->dev;
345         machine_data->card.num_links = 2;
346         machine_data->card.dai_link = machine_data->dai;
347 
348         /* Register with ASoC */
349         ret = snd_soc_register_card(&machine_data->card);
350         if (ret) {
351                 dev_err(&pdev->dev, "could not register card\n");
352                 goto error;
353         }
354 
355         of_node_put(codec_np);
356 
357         return 0;
358 
359 error:
360         kfree(machine_data);
361 error_alloc:
362         of_node_put(codec_np);
363         return ret;
364 }
365 
366 /**
367  * mpc8610_hpcd_remove: remove the platform device
368  *
369  * This function is called when the platform device is removed.
370  */
371 static int mpc8610_hpcd_remove(struct platform_device *pdev)
372 {
373         struct snd_soc_card *card = platform_get_drvdata(pdev);
374         struct mpc8610_hpcd_data *machine_data =
375                 container_of(card, struct mpc8610_hpcd_data, card);
376 
377         snd_soc_unregister_card(card);
378         kfree(machine_data);
379 
380         return 0;
381 }
382 
383 static struct platform_driver mpc8610_hpcd_driver = {
384         .probe = mpc8610_hpcd_probe,
385         .remove = mpc8610_hpcd_remove,
386         .driver = {
387                 /* The name must match 'compatible' property in the device tree,
388                  * in lowercase letters.
389                  */
390                 .name = "snd-soc-mpc8610hpcd",
391         },
392 };
393 
394 /**
395  * mpc8610_hpcd_init: machine driver initialization.
396  *
397  * This function is called when this module is loaded.
398  */
399 static int __init mpc8610_hpcd_init(void)
400 {
401         struct device_node *guts_np;
402         struct resource res;
403 
404         pr_info("Freescale MPC8610 HPCD ALSA SoC machine driver\n");
405 
406         /* Get the physical address of the global utilities registers */
407         guts_np = of_find_compatible_node(NULL, NULL, "fsl,mpc8610-guts");
408         if (of_address_to_resource(guts_np, 0, &res)) {
409                 pr_err("mpc8610-hpcd: missing/invalid global utilities node\n");
410                 return -EINVAL;
411         }
412         guts_phys = res.start;
413 
414         return platform_driver_register(&mpc8610_hpcd_driver);
415 }
416 
417 /**
418  * mpc8610_hpcd_exit: machine driver exit
419  *
420  * This function is called when this driver is unloaded.
421  */
422 static void __exit mpc8610_hpcd_exit(void)
423 {
424         platform_driver_unregister(&mpc8610_hpcd_driver);
425 }
426 
427 module_init(mpc8610_hpcd_init);
428 module_exit(mpc8610_hpcd_exit);
429 
430 MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
431 MODULE_DESCRIPTION("Freescale MPC8610 HPCD ALSA SoC machine driver");
432 MODULE_LICENSE("GPL v2");
433 

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