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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/fsl/guts.h>
 15 #include <linux/interrupt.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 /* 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 = to_platform_device(dev);
203         struct device_node *np = ssi_pdev->dev.of_node;
204         struct device_node *codec_np = NULL;
205         struct machine_data *mdata;
206         int ret = -ENODEV;
207         const char *sprop;
208         const u32 *iprop;
209 
210         /* Find the codec node for this SSI. */
211         codec_np = of_parse_phandle(np, "codec-handle", 0);
212         if (!codec_np) {
213                 dev_err(dev, "could not find codec node\n");
214                 return -EINVAL;
215         }
216 
217         mdata = kzalloc(sizeof(struct machine_data), GFP_KERNEL);
218         if (!mdata) {
219                 ret = -ENOMEM;
220                 goto error_put;
221         }
222 
223         mdata->dai[0].cpu_dai_name = dev_name(&ssi_pdev->dev);
224         mdata->dai[0].ops = &p1022_ds_ops;
225 
226         /* ASoC core can match codec with device node */
227         mdata->dai[0].codec_of_node = codec_np;
228 
229         /* We register two DAIs per SSI, one for playback and the other for
230          * capture.  We support codecs that have separate DAIs for both playback
231          * and capture.
232          */
233         memcpy(&mdata->dai[1], &mdata->dai[0], sizeof(struct snd_soc_dai_link));
234 
235         /* The DAI names from the codec (snd_soc_dai_driver.name) */
236         mdata->dai[0].codec_dai_name = "wm8776-hifi-playback";
237         mdata->dai[1].codec_dai_name = "wm8776-hifi-capture";
238 
239         /* Get the device ID */
240         iprop = of_get_property(np, "cell-index", NULL);
241         if (!iprop) {
242                 dev_err(&pdev->dev, "cell-index property not found\n");
243                 ret = -EINVAL;
244                 goto error;
245         }
246         mdata->ssi_id = be32_to_cpup(iprop);
247 
248         /* Get the serial format and clock direction. */
249         sprop = of_get_property(np, "fsl,mode", NULL);
250         if (!sprop) {
251                 dev_err(&pdev->dev, "fsl,mode property not found\n");
252                 ret = -EINVAL;
253                 goto error;
254         }
255 
256         if (strcasecmp(sprop, "i2s-slave") == 0) {
257                 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
258                         SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM;
259                 mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
260                 mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
261 
262                 /* In i2s-slave mode, the codec has its own clock source, so we
263                  * need to get the frequency from the device tree and pass it to
264                  * the codec driver.
265                  */
266                 iprop = of_get_property(codec_np, "clock-frequency", NULL);
267                 if (!iprop || !*iprop) {
268                         dev_err(&pdev->dev, "codec bus-frequency "
269                                 "property is missing or invalid\n");
270                         ret = -EINVAL;
271                         goto error;
272                 }
273                 mdata->clk_frequency = be32_to_cpup(iprop);
274         } else if (strcasecmp(sprop, "i2s-master") == 0) {
275                 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
276                         SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS;
277                 mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
278                 mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
279         } else if (strcasecmp(sprop, "lj-slave") == 0) {
280                 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
281                         SND_SOC_DAIFMT_LEFT_J | SND_SOC_DAIFMT_CBM_CFM;
282                 mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
283                 mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
284         } else if (strcasecmp(sprop, "lj-master") == 0) {
285                 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
286                         SND_SOC_DAIFMT_LEFT_J | SND_SOC_DAIFMT_CBS_CFS;
287                 mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
288                 mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
289         } else if (strcasecmp(sprop, "rj-slave") == 0) {
290                 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
291                         SND_SOC_DAIFMT_RIGHT_J | SND_SOC_DAIFMT_CBM_CFM;
292                 mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
293                 mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
294         } else if (strcasecmp(sprop, "rj-master") == 0) {
295                 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
296                         SND_SOC_DAIFMT_RIGHT_J | SND_SOC_DAIFMT_CBS_CFS;
297                 mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
298                 mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
299         } else if (strcasecmp(sprop, "ac97-slave") == 0) {
300                 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
301                         SND_SOC_DAIFMT_AC97 | SND_SOC_DAIFMT_CBM_CFM;
302                 mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
303                 mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
304         } else if (strcasecmp(sprop, "ac97-master") == 0) {
305                 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
306                         SND_SOC_DAIFMT_AC97 | SND_SOC_DAIFMT_CBS_CFS;
307                 mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
308                 mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
309         } else {
310                 dev_err(&pdev->dev,
311                         "unrecognized fsl,mode property '%s'\n", sprop);
312                 ret = -EINVAL;
313                 goto error;
314         }
315 
316         if (!mdata->clk_frequency) {
317                 dev_err(&pdev->dev, "unknown clock frequency\n");
318                 ret = -EINVAL;
319                 goto error;
320         }
321 
322         /* Find the playback DMA channel to use. */
323         mdata->dai[0].platform_name = mdata->platform_name[0];
324         ret = fsl_asoc_get_dma_channel(np, "fsl,playback-dma", &mdata->dai[0],
325                                        &mdata->dma_channel_id[0],
326                                        &mdata->dma_id[0]);
327         if (ret) {
328                 dev_err(&pdev->dev, "missing/invalid playback DMA phandle\n");
329                 goto error;
330         }
331 
332         /* Find the capture DMA channel to use. */
333         mdata->dai[1].platform_name = mdata->platform_name[1];
334         ret = fsl_asoc_get_dma_channel(np, "fsl,capture-dma", &mdata->dai[1],
335                                        &mdata->dma_channel_id[1],
336                                        &mdata->dma_id[1]);
337         if (ret) {
338                 dev_err(&pdev->dev, "missing/invalid capture DMA phandle\n");
339                 goto error;
340         }
341 
342         /* Initialize our DAI data structure.  */
343         mdata->dai[0].stream_name = "playback";
344         mdata->dai[1].stream_name = "capture";
345         mdata->dai[0].name = mdata->dai[0].stream_name;
346         mdata->dai[1].name = mdata->dai[1].stream_name;
347 
348         mdata->card.probe = p1022_ds_machine_probe;
349         mdata->card.remove = p1022_ds_machine_remove;
350         mdata->card.name = pdev->name; /* The platform driver name */
351         mdata->card.owner = THIS_MODULE;
352         mdata->card.dev = &pdev->dev;
353         mdata->card.num_links = 2;
354         mdata->card.dai_link = mdata->dai;
355 
356         /* Register with ASoC */
357         ret = snd_soc_register_card(&mdata->card);
358         if (ret) {
359                 dev_err(&pdev->dev, "could not register card\n");
360                 goto error;
361         }
362 
363         of_node_put(codec_np);
364 
365         return 0;
366 
367 error:
368         kfree(mdata);
369 error_put:
370         of_node_put(codec_np);
371         return ret;
372 }
373 
374 /**
375  * p1022_ds_remove: remove the platform device
376  *
377  * This function is called when the platform device is removed.
378  */
379 static int p1022_ds_remove(struct platform_device *pdev)
380 {
381         struct snd_soc_card *card = platform_get_drvdata(pdev);
382         struct machine_data *mdata =
383                 container_of(card, struct machine_data, card);
384 
385         snd_soc_unregister_card(card);
386         kfree(mdata);
387 
388         return 0;
389 }
390 
391 static struct platform_driver p1022_ds_driver = {
392         .probe = p1022_ds_probe,
393         .remove = p1022_ds_remove,
394         .driver = {
395                 /*
396                  * The name must match 'compatible' property in the device tree,
397                  * in lowercase letters.
398                  */
399                 .name = "snd-soc-p1022ds",
400         },
401 };
402 
403 /**
404  * p1022_ds_init: machine driver initialization.
405  *
406  * This function is called when this module is loaded.
407  */
408 static int __init p1022_ds_init(void)
409 {
410         struct device_node *guts_np;
411         struct resource res;
412 
413         /* Get the physical address of the global utilities registers */
414         guts_np = of_find_compatible_node(NULL, NULL, "fsl,p1022-guts");
415         if (of_address_to_resource(guts_np, 0, &res)) {
416                 pr_err("snd-soc-p1022ds: missing/invalid global utils node\n");
417                 of_node_put(guts_np);
418                 return -EINVAL;
419         }
420         guts_phys = res.start;
421         of_node_put(guts_np);
422 
423         return platform_driver_register(&p1022_ds_driver);
424 }
425 
426 /**
427  * p1022_ds_exit: machine driver exit
428  *
429  * This function is called when this driver is unloaded.
430  */
431 static void __exit p1022_ds_exit(void)
432 {
433         platform_driver_unregister(&p1022_ds_driver);
434 }
435 
436 module_init(p1022_ds_init);
437 module_exit(p1022_ds_exit);
438 
439 MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
440 MODULE_DESCRIPTION("Freescale P1022 DS ALSA SoC machine driver");
441 MODULE_LICENSE("GPL v2");
442 

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