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Linux/sound/soc/fsl/p1022_ds.c

  1 /**
  2  * Freescale P1022DS ALSA SoC Machine driver
  3  *
  4  * Author: Timur Tabi <timur@freescale.com>
  5  *
  6  * Copyright 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 /* P1022-specific PMUXCR and DMUXCR bit definitions */
 26 
 27 #define CCSR_GUTS_PMUXCR_UART0_I2C1_MASK        0x0001c000
 28 #define CCSR_GUTS_PMUXCR_UART0_I2C1_UART0_SSI   0x00010000
 29 #define CCSR_GUTS_PMUXCR_UART0_I2C1_SSI         0x00018000
 30 
 31 #define CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK       0x00000c00
 32 #define CCSR_GUTS_PMUXCR_SSI_DMA_TDM_SSI        0x00000000
 33 
 34 #define CCSR_GUTS_DMUXCR_PAD    1       /* DMA controller/channel set to pad */
 35 #define CCSR_GUTS_DMUXCR_SSI    2       /* DMA controller/channel set to SSI */
 36 
 37 /*
 38  * Set the DMACR register in the GUTS
 39  *
 40  * The DMACR register determines the source of initiated transfers for each
 41  * channel on each DMA controller.  Rather than have a bunch of repetitive
 42  * macros for the bit patterns, we just have a function that calculates
 43  * them.
 44  *
 45  * guts: Pointer to GUTS structure
 46  * co: The DMA controller (0 or 1)
 47  * ch: The channel on the DMA controller (0, 1, 2, or 3)
 48  * device: The device to set as the target (CCSR_GUTS_DMUXCR_xxx)
 49  */
 50 static inline void guts_set_dmuxcr(struct ccsr_guts __iomem *guts,
 51         unsigned int co, unsigned int ch, unsigned int device)
 52 {
 53         unsigned int shift = 16 + (8 * (1 - co) + 2 * (3 - ch));
 54 
 55         clrsetbits_be32(&guts->dmuxcr, 3 << shift, device << shift);
 56 }
 57 
 58 /* There's only one global utilities register */
 59 static phys_addr_t guts_phys;
 60 
 61 /**
 62  * machine_data: machine-specific ASoC device data
 63  *
 64  * This structure contains data for a single sound platform device on an
 65  * P1022 DS.  Some of the data is taken from the device tree.
 66  */
 67 struct machine_data {
 68         struct snd_soc_dai_link dai[2];
 69         struct snd_soc_card card;
 70         unsigned int dai_format;
 71         unsigned int codec_clk_direction;
 72         unsigned int cpu_clk_direction;
 73         unsigned int clk_frequency;
 74         unsigned int ssi_id;            /* 0 = SSI1, 1 = SSI2, etc */
 75         unsigned int dma_id[2];         /* 0 = DMA1, 1 = DMA2, etc */
 76         unsigned int dma_channel_id[2]; /* 0 = ch 0, 1 = ch 1, etc*/
 77         char platform_name[2][DAI_NAME_SIZE]; /* One for each DMA channel */
 78 };
 79 
 80 /**
 81  * p1022_ds_machine_probe: initialize the board
 82  *
 83  * This function is used to initialize the board-specific hardware.
 84  *
 85  * Here we program the DMACR and PMUXCR registers.
 86  */
 87 static int p1022_ds_machine_probe(struct snd_soc_card *card)
 88 {
 89         struct machine_data *mdata =
 90                 container_of(card, struct machine_data, card);
 91         struct ccsr_guts __iomem *guts;
 92 
 93         guts = ioremap(guts_phys, sizeof(struct ccsr_guts));
 94         if (!guts) {
 95                 dev_err(card->dev, "could not map global utilities\n");
 96                 return -ENOMEM;
 97         }
 98 
 99         /* Enable SSI Tx signal */
100         clrsetbits_be32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_UART0_I2C1_MASK,
101                         CCSR_GUTS_PMUXCR_UART0_I2C1_UART0_SSI);
102 
103         /* Enable SSI Rx signal */
104         clrsetbits_be32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK,
105                         CCSR_GUTS_PMUXCR_SSI_DMA_TDM_SSI);
106 
107         /* Enable DMA Channel for SSI */
108         guts_set_dmuxcr(guts, mdata->dma_id[0], mdata->dma_channel_id[0],
109                         CCSR_GUTS_DMUXCR_SSI);
110 
111         guts_set_dmuxcr(guts, mdata->dma_id[1], mdata->dma_channel_id[1],
112                         CCSR_GUTS_DMUXCR_SSI);
113 
114         iounmap(guts);
115 
116         return 0;
117 }
118 
119 /**
120  * p1022_ds_startup: program the board with various hardware parameters
121  *
122  * This function takes board-specific information, like clock frequencies
123  * and serial data formats, and passes that information to the codec and
124  * transport drivers.
125  */
126 static int p1022_ds_startup(struct snd_pcm_substream *substream)
127 {
128         struct snd_soc_pcm_runtime *rtd = substream->private_data;
129         struct machine_data *mdata =
130                 container_of(rtd->card, struct machine_data, card);
131         struct device *dev = rtd->card->dev;
132         int ret = 0;
133 
134         /* Tell the codec driver what the serial protocol is. */
135         ret = snd_soc_dai_set_fmt(rtd->codec_dai, mdata->dai_format);
136         if (ret < 0) {
137                 dev_err(dev, "could not set codec driver audio format\n");
138                 return ret;
139         }
140 
141         /*
142          * Tell the codec driver what the MCLK frequency is, and whether it's
143          * a slave or master.
144          */
145         ret = snd_soc_dai_set_sysclk(rtd->codec_dai, 0, mdata->clk_frequency,
146                                      mdata->codec_clk_direction);
147         if (ret < 0) {
148                 dev_err(dev, "could not set codec driver clock params\n");
149                 return ret;
150         }
151 
152         return 0;
153 }
154 
155 /**
156  * p1022_ds_machine_remove: Remove the sound device
157  *
158  * This function is called to remove the sound device for one SSI.  We
159  * de-program the DMACR and PMUXCR register.
160  */
161 static int p1022_ds_machine_remove(struct snd_soc_card *card)
162 {
163         struct machine_data *mdata =
164                 container_of(card, struct machine_data, card);
165         struct ccsr_guts __iomem *guts;
166 
167         guts = ioremap(guts_phys, sizeof(struct ccsr_guts));
168         if (!guts) {
169                 dev_err(card->dev, "could not map global utilities\n");
170                 return -ENOMEM;
171         }
172 
173         /* Restore the signal routing */
174         clrbits32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_UART0_I2C1_MASK);
175         clrbits32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK);
176         guts_set_dmuxcr(guts, mdata->dma_id[0], mdata->dma_channel_id[0], 0);
177         guts_set_dmuxcr(guts, mdata->dma_id[1], mdata->dma_channel_id[1], 0);
178 
179         iounmap(guts);
180 
181         return 0;
182 }
183 
184 /**
185  * p1022_ds_ops: ASoC machine driver operations
186  */
187 static struct snd_soc_ops p1022_ds_ops = {
188         .startup = p1022_ds_startup,
189 };
190 
191 /**
192  * p1022_ds_probe: platform probe function for the machine driver
193  *
194  * Although this is a machine driver, the SSI node is the "master" node with
195  * respect to audio hardware connections.  Therefore, we create a new ASoC
196  * device for each new SSI node that has a codec attached.
197  */
198 static int p1022_ds_probe(struct platform_device *pdev)
199 {
200         struct device *dev = pdev->dev.parent;
201         /* ssi_pdev is the platform device for the SSI node that probed us */
202         struct platform_device *ssi_pdev =
203                 container_of(dev, struct platform_device, dev);
204         struct device_node *np = ssi_pdev->dev.of_node;
205         struct device_node *codec_np = NULL;
206         struct machine_data *mdata;
207         int ret = -ENODEV;
208         const char *sprop;
209         const u32 *iprop;
210 
211         /* Find the codec node for this SSI. */
212         codec_np = of_parse_phandle(np, "codec-handle", 0);
213         if (!codec_np) {
214                 dev_err(dev, "could not find codec node\n");
215                 return -EINVAL;
216         }
217 
218         mdata = kzalloc(sizeof(struct machine_data), GFP_KERNEL);
219         if (!mdata) {
220                 ret = -ENOMEM;
221                 goto error_put;
222         }
223 
224         mdata->dai[0].cpu_dai_name = dev_name(&ssi_pdev->dev);
225         mdata->dai[0].ops = &p1022_ds_ops;
226 
227         /* ASoC core can match codec with device node */
228         mdata->dai[0].codec_of_node = codec_np;
229 
230         /* We register two DAIs per SSI, one for playback and the other for
231          * capture.  We support codecs that have separate DAIs for both playback
232          * and capture.
233          */
234         memcpy(&mdata->dai[1], &mdata->dai[0], sizeof(struct snd_soc_dai_link));
235 
236         /* The DAI names from the codec (snd_soc_dai_driver.name) */
237         mdata->dai[0].codec_dai_name = "wm8776-hifi-playback";
238         mdata->dai[1].codec_dai_name = "wm8776-hifi-capture";
239 
240         /* Get the device ID */
241         iprop = of_get_property(np, "cell-index", NULL);
242         if (!iprop) {
243                 dev_err(&pdev->dev, "cell-index property not found\n");
244                 ret = -EINVAL;
245                 goto error;
246         }
247         mdata->ssi_id = be32_to_cpup(iprop);
248 
249         /* Get the serial format and clock direction. */
250         sprop = of_get_property(np, "fsl,mode", NULL);
251         if (!sprop) {
252                 dev_err(&pdev->dev, "fsl,mode property not found\n");
253                 ret = -EINVAL;
254                 goto error;
255         }
256 
257         if (strcasecmp(sprop, "i2s-slave") == 0) {
258                 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
259                         SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM;
260                 mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
261                 mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
262 
263                 /* In i2s-slave mode, the codec has its own clock source, so we
264                  * need to get the frequency from the device tree and pass it to
265                  * the codec driver.
266                  */
267                 iprop = of_get_property(codec_np, "clock-frequency", NULL);
268                 if (!iprop || !*iprop) {
269                         dev_err(&pdev->dev, "codec bus-frequency "
270                                 "property is missing or invalid\n");
271                         ret = -EINVAL;
272                         goto error;
273                 }
274                 mdata->clk_frequency = be32_to_cpup(iprop);
275         } else if (strcasecmp(sprop, "i2s-master") == 0) {
276                 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
277                         SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS;
278                 mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
279                 mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
280         } else if (strcasecmp(sprop, "lj-slave") == 0) {
281                 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
282                         SND_SOC_DAIFMT_LEFT_J | SND_SOC_DAIFMT_CBM_CFM;
283                 mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
284                 mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
285         } else if (strcasecmp(sprop, "lj-master") == 0) {
286                 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
287                         SND_SOC_DAIFMT_LEFT_J | SND_SOC_DAIFMT_CBS_CFS;
288                 mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
289                 mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
290         } else if (strcasecmp(sprop, "rj-slave") == 0) {
291                 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
292                         SND_SOC_DAIFMT_RIGHT_J | SND_SOC_DAIFMT_CBM_CFM;
293                 mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
294                 mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
295         } else if (strcasecmp(sprop, "rj-master") == 0) {
296                 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
297                         SND_SOC_DAIFMT_RIGHT_J | SND_SOC_DAIFMT_CBS_CFS;
298                 mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
299                 mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
300         } else if (strcasecmp(sprop, "ac97-slave") == 0) {
301                 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
302                         SND_SOC_DAIFMT_AC97 | SND_SOC_DAIFMT_CBM_CFM;
303                 mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
304                 mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
305         } else if (strcasecmp(sprop, "ac97-master") == 0) {
306                 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
307                         SND_SOC_DAIFMT_AC97 | SND_SOC_DAIFMT_CBS_CFS;
308                 mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
309                 mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
310         } else {
311                 dev_err(&pdev->dev,
312                         "unrecognized fsl,mode property '%s'\n", sprop);
313                 ret = -EINVAL;
314                 goto error;
315         }
316 
317         if (!mdata->clk_frequency) {
318                 dev_err(&pdev->dev, "unknown clock frequency\n");
319                 ret = -EINVAL;
320                 goto error;
321         }
322 
323         /* Find the playback DMA channel to use. */
324         mdata->dai[0].platform_name = mdata->platform_name[0];
325         ret = fsl_asoc_get_dma_channel(np, "fsl,playback-dma", &mdata->dai[0],
326                                        &mdata->dma_channel_id[0],
327                                        &mdata->dma_id[0]);
328         if (ret) {
329                 dev_err(&pdev->dev, "missing/invalid playback DMA phandle\n");
330                 goto error;
331         }
332 
333         /* Find the capture DMA channel to use. */
334         mdata->dai[1].platform_name = mdata->platform_name[1];
335         ret = fsl_asoc_get_dma_channel(np, "fsl,capture-dma", &mdata->dai[1],
336                                        &mdata->dma_channel_id[1],
337                                        &mdata->dma_id[1]);
338         if (ret) {
339                 dev_err(&pdev->dev, "missing/invalid capture DMA phandle\n");
340                 goto error;
341         }
342 
343         /* Initialize our DAI data structure.  */
344         mdata->dai[0].stream_name = "playback";
345         mdata->dai[1].stream_name = "capture";
346         mdata->dai[0].name = mdata->dai[0].stream_name;
347         mdata->dai[1].name = mdata->dai[1].stream_name;
348 
349         mdata->card.probe = p1022_ds_machine_probe;
350         mdata->card.remove = p1022_ds_machine_remove;
351         mdata->card.name = pdev->name; /* The platform driver name */
352         mdata->card.owner = THIS_MODULE;
353         mdata->card.dev = &pdev->dev;
354         mdata->card.num_links = 2;
355         mdata->card.dai_link = mdata->dai;
356 
357         /* Register with ASoC */
358         ret = snd_soc_register_card(&mdata->card);
359         if (ret) {
360                 dev_err(&pdev->dev, "could not register card\n");
361                 goto error;
362         }
363 
364         of_node_put(codec_np);
365 
366         return 0;
367 
368 error:
369         kfree(mdata);
370 error_put:
371         of_node_put(codec_np);
372         return ret;
373 }
374 
375 /**
376  * p1022_ds_remove: remove the platform device
377  *
378  * This function is called when the platform device is removed.
379  */
380 static int p1022_ds_remove(struct platform_device *pdev)
381 {
382         struct snd_soc_card *card = platform_get_drvdata(pdev);
383         struct machine_data *mdata =
384                 container_of(card, struct machine_data, card);
385 
386         snd_soc_unregister_card(card);
387         kfree(mdata);
388 
389         return 0;
390 }
391 
392 static struct platform_driver p1022_ds_driver = {
393         .probe = p1022_ds_probe,
394         .remove = p1022_ds_remove,
395         .driver = {
396                 /*
397                  * The name must match 'compatible' property in the device tree,
398                  * in lowercase letters.
399                  */
400                 .name = "snd-soc-p1022ds",
401                 .owner = THIS_MODULE,
402         },
403 };
404 
405 /**
406  * p1022_ds_init: machine driver initialization.
407  *
408  * This function is called when this module is loaded.
409  */
410 static int __init p1022_ds_init(void)
411 {
412         struct device_node *guts_np;
413         struct resource res;
414 
415         /* Get the physical address of the global utilities registers */
416         guts_np = of_find_compatible_node(NULL, NULL, "fsl,p1022-guts");
417         if (of_address_to_resource(guts_np, 0, &res)) {
418                 pr_err("snd-soc-p1022ds: missing/invalid global utils node\n");
419                 of_node_put(guts_np);
420                 return -EINVAL;
421         }
422         guts_phys = res.start;
423         of_node_put(guts_np);
424 
425         return platform_driver_register(&p1022_ds_driver);
426 }
427 
428 /**
429  * p1022_ds_exit: machine driver exit
430  *
431  * This function is called when this driver is unloaded.
432  */
433 static void __exit p1022_ds_exit(void)
434 {
435         platform_driver_unregister(&p1022_ds_driver);
436 }
437 
438 module_init(p1022_ds_init);
439 module_exit(p1022_ds_exit);
440 
441 MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
442 MODULE_DESCRIPTION("Freescale P1022 DS ALSA SoC machine driver");
443 MODULE_LICENSE("GPL v2");
444 

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