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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/of_address.h>
 16 #include <linux/of_device.h>
 17 #include <linux/slab.h>
 18 #include <sound/soc.h>
 19 #include <asm/fsl_guts.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 =
193                 container_of(dev, struct platform_device, dev);
194         struct device_node *np = ssi_pdev->dev.of_node;
195         struct device_node *codec_np = NULL;
196         struct mpc8610_hpcd_data *machine_data;
197         int ret = -ENODEV;
198         const char *sprop;
199         const u32 *iprop;
200 
201         /* Find the codec node for this SSI. */
202         codec_np = of_parse_phandle(np, "codec-handle", 0);
203         if (!codec_np) {
204                 dev_err(dev, "invalid codec node\n");
205                 return -EINVAL;
206         }
207 
208         machine_data = kzalloc(sizeof(struct mpc8610_hpcd_data), GFP_KERNEL);
209         if (!machine_data) {
210                 ret = -ENOMEM;
211                 goto error_alloc;
212         }
213 
214         machine_data->dai[0].cpu_dai_name = dev_name(&ssi_pdev->dev);
215         machine_data->dai[0].ops = &mpc8610_hpcd_ops;
216 
217         /* ASoC core can match codec with device node */
218         machine_data->dai[0].codec_of_node = codec_np;
219 
220         /* The DAI name from the codec (snd_soc_dai_driver.name) */
221         machine_data->dai[0].codec_dai_name = "cs4270-hifi";
222 
223         /* We register two DAIs per SSI, one for playback and the other for
224          * capture.  Currently, we only support codecs that have one DAI for
225          * both playback and capture.
226          */
227         memcpy(&machine_data->dai[1], &machine_data->dai[0],
228                sizeof(struct snd_soc_dai_link));
229 
230         /* Get the device ID */
231         iprop = of_get_property(np, "cell-index", NULL);
232         if (!iprop) {
233                 dev_err(&pdev->dev, "cell-index property not found\n");
234                 ret = -EINVAL;
235                 goto error;
236         }
237         machine_data->ssi_id = be32_to_cpup(iprop);
238 
239         /* Get the serial format and clock direction. */
240         sprop = of_get_property(np, "fsl,mode", NULL);
241         if (!sprop) {
242                 dev_err(&pdev->dev, "fsl,mode property not found\n");
243                 ret = -EINVAL;
244                 goto error;
245         }
246 
247         if (strcasecmp(sprop, "i2s-slave") == 0) {
248                 machine_data->dai_format =
249                         SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM;
250                 machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
251                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;
252 
253                 /* In i2s-slave mode, the codec has its own clock source, so we
254                  * need to get the frequency from the device tree and pass it to
255                  * the codec driver.
256                  */
257                 iprop = of_get_property(codec_np, "clock-frequency", NULL);
258                 if (!iprop || !*iprop) {
259                         dev_err(&pdev->dev, "codec bus-frequency "
260                                 "property is missing or invalid\n");
261                         ret = -EINVAL;
262                         goto error;
263                 }
264                 machine_data->clk_frequency = be32_to_cpup(iprop);
265         } else if (strcasecmp(sprop, "i2s-master") == 0) {
266                 machine_data->dai_format =
267                         SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS;
268                 machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
269                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
270         } else if (strcasecmp(sprop, "lj-slave") == 0) {
271                 machine_data->dai_format =
272                         SND_SOC_DAIFMT_LEFT_J | SND_SOC_DAIFMT_CBM_CFM;
273                 machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
274                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;
275         } else if (strcasecmp(sprop, "lj-master") == 0) {
276                 machine_data->dai_format =
277                         SND_SOC_DAIFMT_LEFT_J | SND_SOC_DAIFMT_CBS_CFS;
278                 machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
279                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
280         } else if (strcasecmp(sprop, "rj-slave") == 0) {
281                 machine_data->dai_format =
282                         SND_SOC_DAIFMT_RIGHT_J | SND_SOC_DAIFMT_CBM_CFM;
283                 machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
284                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;
285         } else if (strcasecmp(sprop, "rj-master") == 0) {
286                 machine_data->dai_format =
287                         SND_SOC_DAIFMT_RIGHT_J | SND_SOC_DAIFMT_CBS_CFS;
288                 machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
289                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
290         } else if (strcasecmp(sprop, "ac97-slave") == 0) {
291                 machine_data->dai_format =
292                         SND_SOC_DAIFMT_AC97 | SND_SOC_DAIFMT_CBM_CFM;
293                 machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
294                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;
295         } else if (strcasecmp(sprop, "ac97-master") == 0) {
296                 machine_data->dai_format =
297                         SND_SOC_DAIFMT_AC97 | SND_SOC_DAIFMT_CBS_CFS;
298                 machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
299                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
300         } else {
301                 dev_err(&pdev->dev,
302                         "unrecognized fsl,mode property '%s'\n", sprop);
303                 ret = -EINVAL;
304                 goto error;
305         }
306 
307         if (!machine_data->clk_frequency) {
308                 dev_err(&pdev->dev, "unknown clock frequency\n");
309                 ret = -EINVAL;
310                 goto error;
311         }
312 
313         /* Find the playback DMA channel to use. */
314         machine_data->dai[0].platform_name = machine_data->platform_name[0];
315         ret = fsl_asoc_get_dma_channel(np, "fsl,playback-dma",
316                                        &machine_data->dai[0],
317                                        &machine_data->dma_channel_id[0],
318                                        &machine_data->dma_id[0]);
319         if (ret) {
320                 dev_err(&pdev->dev, "missing/invalid playback DMA phandle\n");
321                 goto error;
322         }
323 
324         /* Find the capture DMA channel to use. */
325         machine_data->dai[1].platform_name = machine_data->platform_name[1];
326         ret = fsl_asoc_get_dma_channel(np, "fsl,capture-dma",
327                                        &machine_data->dai[1],
328                                        &machine_data->dma_channel_id[1],
329                                        &machine_data->dma_id[1]);
330         if (ret) {
331                 dev_err(&pdev->dev, "missing/invalid capture DMA phandle\n");
332                 goto error;
333         }
334 
335         /* Initialize our DAI data structure.  */
336         machine_data->dai[0].stream_name = "playback";
337         machine_data->dai[1].stream_name = "capture";
338         machine_data->dai[0].name = machine_data->dai[0].stream_name;
339         machine_data->dai[1].name = machine_data->dai[1].stream_name;
340 
341         machine_data->card.probe = mpc8610_hpcd_machine_probe;
342         machine_data->card.remove = mpc8610_hpcd_machine_remove;
343         machine_data->card.name = pdev->name; /* The platform driver name */
344         machine_data->card.owner = THIS_MODULE;
345         machine_data->card.dev = &pdev->dev;
346         machine_data->card.num_links = 2;
347         machine_data->card.dai_link = machine_data->dai;
348 
349         /* Register with ASoC */
350         ret = snd_soc_register_card(&machine_data->card);
351         if (ret) {
352                 dev_err(&pdev->dev, "could not register card\n");
353                 goto error;
354         }
355 
356         of_node_put(codec_np);
357 
358         return 0;
359 
360 error:
361         kfree(machine_data);
362 error_alloc:
363         of_node_put(codec_np);
364         return ret;
365 }
366 
367 /**
368  * mpc8610_hpcd_remove: remove the platform device
369  *
370  * This function is called when the platform device is removed.
371  */
372 static int mpc8610_hpcd_remove(struct platform_device *pdev)
373 {
374         struct snd_soc_card *card = platform_get_drvdata(pdev);
375         struct mpc8610_hpcd_data *machine_data =
376                 container_of(card, struct mpc8610_hpcd_data, card);
377 
378         snd_soc_unregister_card(card);
379         kfree(machine_data);
380 
381         return 0;
382 }
383 
384 static struct platform_driver mpc8610_hpcd_driver = {
385         .probe = mpc8610_hpcd_probe,
386         .remove = mpc8610_hpcd_remove,
387         .driver = {
388                 /* The name must match 'compatible' property in the device tree,
389                  * in lowercase letters.
390                  */
391                 .name = "snd-soc-mpc8610hpcd",
392                 .owner = THIS_MODULE,
393         },
394 };
395 
396 /**
397  * mpc8610_hpcd_init: machine driver initialization.
398  *
399  * This function is called when this module is loaded.
400  */
401 static int __init mpc8610_hpcd_init(void)
402 {
403         struct device_node *guts_np;
404         struct resource res;
405 
406         pr_info("Freescale MPC8610 HPCD ALSA SoC machine driver\n");
407 
408         /* Get the physical address of the global utilities registers */
409         guts_np = of_find_compatible_node(NULL, NULL, "fsl,mpc8610-guts");
410         if (of_address_to_resource(guts_np, 0, &res)) {
411                 pr_err("mpc8610-hpcd: missing/invalid global utilities node\n");
412                 return -EINVAL;
413         }
414         guts_phys = res.start;
415 
416         return platform_driver_register(&mpc8610_hpcd_driver);
417 }
418 
419 /**
420  * mpc8610_hpcd_exit: machine driver exit
421  *
422  * This function is called when this driver is unloaded.
423  */
424 static void __exit mpc8610_hpcd_exit(void)
425 {
426         platform_driver_unregister(&mpc8610_hpcd_driver);
427 }
428 
429 module_init(mpc8610_hpcd_init);
430 module_exit(mpc8610_hpcd_exit);
431 
432 MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
433 MODULE_DESCRIPTION("Freescale MPC8610 HPCD ALSA SoC machine driver");
434 MODULE_LICENSE("GPL v2");
435 

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