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Linux/sound/soc/fsl/p1022_rdk.c

  1 /**
  2  * Freescale P1022RDK ALSA SoC Machine driver
  3  *
  4  * Author: Timur Tabi <timur@freescale.com>
  5  *
  6  * Copyright 2012 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  * Note: in order for audio to work correctly, the output controls need
 13  * to be enabled, because they control the clock.  So for playback, for
 14  * example:
 15  *
 16  *      amixer sset 'Left Output Mixer PCM' on
 17  *      amixer sset 'Right Output Mixer PCM' on
 18  */
 19 
 20 #include <linux/module.h>
 21 #include <linux/interrupt.h>
 22 #include <linux/of_address.h>
 23 #include <linux/of_device.h>
 24 #include <linux/slab.h>
 25 #include <sound/soc.h>
 26 #include <asm/fsl_guts.h>
 27 
 28 #include "fsl_dma.h"
 29 #include "fsl_ssi.h"
 30 #include "fsl_utils.h"
 31 
 32 /* P1022-specific PMUXCR and DMUXCR bit definitions */
 33 
 34 #define CCSR_GUTS_PMUXCR_UART0_I2C1_MASK        0x0001c000
 35 #define CCSR_GUTS_PMUXCR_UART0_I2C1_UART0_SSI   0x00010000
 36 #define CCSR_GUTS_PMUXCR_UART0_I2C1_SSI         0x00018000
 37 
 38 #define CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK       0x00000c00
 39 #define CCSR_GUTS_PMUXCR_SSI_DMA_TDM_SSI        0x00000000
 40 
 41 #define CCSR_GUTS_DMUXCR_PAD    1       /* DMA controller/channel set to pad */
 42 #define CCSR_GUTS_DMUXCR_SSI    2       /* DMA controller/channel set to SSI */
 43 
 44 /*
 45  * Set the DMACR register in the GUTS
 46  *
 47  * The DMACR register determines the source of initiated transfers for each
 48  * channel on each DMA controller.  Rather than have a bunch of repetitive
 49  * macros for the bit patterns, we just have a function that calculates
 50  * them.
 51  *
 52  * guts: Pointer to GUTS structure
 53  * co: The DMA controller (0 or 1)
 54  * ch: The channel on the DMA controller (0, 1, 2, or 3)
 55  * device: The device to set as the target (CCSR_GUTS_DMUXCR_xxx)
 56  */
 57 static inline void guts_set_dmuxcr(struct ccsr_guts __iomem *guts,
 58         unsigned int co, unsigned int ch, unsigned int device)
 59 {
 60         unsigned int shift = 16 + (8 * (1 - co) + 2 * (3 - ch));
 61 
 62         clrsetbits_be32(&guts->dmuxcr, 3 << shift, device << shift);
 63 }
 64 
 65 /* There's only one global utilities register */
 66 static phys_addr_t guts_phys;
 67 
 68 /**
 69  * machine_data: machine-specific ASoC device data
 70  *
 71  * This structure contains data for a single sound platform device on an
 72  * P1022 RDK.  Some of the data is taken from the device tree.
 73  */
 74 struct machine_data {
 75         struct snd_soc_dai_link dai[2];
 76         struct snd_soc_card card;
 77         unsigned int dai_format;
 78         unsigned int codec_clk_direction;
 79         unsigned int cpu_clk_direction;
 80         unsigned int clk_frequency;
 81         unsigned int dma_id[2];         /* 0 = DMA1, 1 = DMA2, etc */
 82         unsigned int dma_channel_id[2]; /* 0 = ch 0, 1 = ch 1, etc*/
 83         char platform_name[2][DAI_NAME_SIZE]; /* One for each DMA channel */
 84 };
 85 
 86 /**
 87  * p1022_rdk_machine_probe: initialize the board
 88  *
 89  * This function is used to initialize the board-specific hardware.
 90  *
 91  * Here we program the DMACR and PMUXCR registers.
 92  */
 93 static int p1022_rdk_machine_probe(struct snd_soc_card *card)
 94 {
 95         struct machine_data *mdata =
 96                 container_of(card, struct machine_data, card);
 97         struct ccsr_guts __iomem *guts;
 98 
 99         guts = ioremap(guts_phys, sizeof(struct ccsr_guts));
100         if (!guts) {
101                 dev_err(card->dev, "could not map global utilities\n");
102                 return -ENOMEM;
103         }
104 
105         /* Enable SSI Tx signal */
106         clrsetbits_be32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_UART0_I2C1_MASK,
107                         CCSR_GUTS_PMUXCR_UART0_I2C1_UART0_SSI);
108 
109         /* Enable SSI Rx signal */
110         clrsetbits_be32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK,
111                         CCSR_GUTS_PMUXCR_SSI_DMA_TDM_SSI);
112 
113         /* Enable DMA Channel for SSI */
114         guts_set_dmuxcr(guts, mdata->dma_id[0], mdata->dma_channel_id[0],
115                         CCSR_GUTS_DMUXCR_SSI);
116 
117         guts_set_dmuxcr(guts, mdata->dma_id[1], mdata->dma_channel_id[1],
118                         CCSR_GUTS_DMUXCR_SSI);
119 
120         iounmap(guts);
121 
122         return 0;
123 }
124 
125 /**
126  * p1022_rdk_startup: program the board with various hardware parameters
127  *
128  * This function takes board-specific information, like clock frequencies
129  * and serial data formats, and passes that information to the codec and
130  * transport drivers.
131  */
132 static int p1022_rdk_startup(struct snd_pcm_substream *substream)
133 {
134         struct snd_soc_pcm_runtime *rtd = substream->private_data;
135         struct machine_data *mdata =
136                 container_of(rtd->card, struct machine_data, card);
137         struct device *dev = rtd->card->dev;
138         int ret = 0;
139 
140         /* Tell the codec driver what the serial protocol is. */
141         ret = snd_soc_dai_set_fmt(rtd->codec_dai, mdata->dai_format);
142         if (ret < 0) {
143                 dev_err(dev, "could not set codec driver audio format (ret=%i)\n",
144                         ret);
145                 return ret;
146         }
147 
148         ret = snd_soc_dai_set_pll(rtd->codec_dai, 0, 0, mdata->clk_frequency,
149                 mdata->clk_frequency);
150         if (ret < 0) {
151                 dev_err(dev, "could not set codec PLL frequency (ret=%i)\n",
152                         ret);
153                 return ret;
154         }
155 
156         return 0;
157 }
158 
159 /**
160  * p1022_rdk_machine_remove: Remove the sound device
161  *
162  * This function is called to remove the sound device for one SSI.  We
163  * de-program the DMACR and PMUXCR register.
164  */
165 static int p1022_rdk_machine_remove(struct snd_soc_card *card)
166 {
167         struct machine_data *mdata =
168                 container_of(card, struct machine_data, card);
169         struct ccsr_guts __iomem *guts;
170 
171         guts = ioremap(guts_phys, sizeof(struct ccsr_guts));
172         if (!guts) {
173                 dev_err(card->dev, "could not map global utilities\n");
174                 return -ENOMEM;
175         }
176 
177         /* Restore the signal routing */
178         clrbits32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_UART0_I2C1_MASK);
179         clrbits32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK);
180         guts_set_dmuxcr(guts, mdata->dma_id[0], mdata->dma_channel_id[0], 0);
181         guts_set_dmuxcr(guts, mdata->dma_id[1], mdata->dma_channel_id[1], 0);
182 
183         iounmap(guts);
184 
185         return 0;
186 }
187 
188 /**
189  * p1022_rdk_ops: ASoC machine driver operations
190  */
191 static struct snd_soc_ops p1022_rdk_ops = {
192         .startup = p1022_rdk_startup,
193 };
194 
195 /**
196  * p1022_rdk_probe: platform probe function for the machine driver
197  *
198  * Although this is a machine driver, the SSI node is the "master" node with
199  * respect to audio hardware connections.  Therefore, we create a new ASoC
200  * device for each new SSI node that has a codec attached.
201  */
202 static int p1022_rdk_probe(struct platform_device *pdev)
203 {
204         struct device *dev = pdev->dev.parent;
205         /* ssi_pdev is the platform device for the SSI node that probed us */
206         struct platform_device *ssi_pdev =
207                 container_of(dev, struct platform_device, dev);
208         struct device_node *np = ssi_pdev->dev.of_node;
209         struct device_node *codec_np = NULL;
210         struct machine_data *mdata;
211         const u32 *iprop;
212         int ret;
213 
214         /* Find the codec node for this SSI. */
215         codec_np = of_parse_phandle(np, "codec-handle", 0);
216         if (!codec_np) {
217                 dev_err(dev, "could not find codec node\n");
218                 return -EINVAL;
219         }
220 
221         mdata = kzalloc(sizeof(struct machine_data), GFP_KERNEL);
222         if (!mdata) {
223                 ret = -ENOMEM;
224                 goto error_put;
225         }
226 
227         mdata->dai[0].cpu_dai_name = dev_name(&ssi_pdev->dev);
228         mdata->dai[0].ops = &p1022_rdk_ops;
229 
230         /* ASoC core can match codec with device node */
231         mdata->dai[0].codec_of_node = codec_np;
232 
233         /*
234          * We register two DAIs per SSI, one for playback and the other for
235          * capture.  We support codecs that have separate DAIs for both playback
236          * and capture.
237          */
238         memcpy(&mdata->dai[1], &mdata->dai[0], sizeof(struct snd_soc_dai_link));
239 
240         /* The DAI names from the codec (snd_soc_dai_driver.name) */
241         mdata->dai[0].codec_dai_name = "wm8960-hifi";
242         mdata->dai[1].codec_dai_name = mdata->dai[0].codec_dai_name;
243 
244         /*
245          * Configure the SSI for I2S slave mode.  Older device trees have
246          * an fsl,mode property, but we ignore that since there's really
247          * only one way to configure the SSI.
248          */
249         mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
250                 SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM;
251         mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
252         mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
253 
254         /*
255          * In i2s-slave mode, the codec has its own clock source, so we
256          * need to get the frequency from the device tree and pass it to
257          * the codec driver.
258          */
259         iprop = of_get_property(codec_np, "clock-frequency", NULL);
260         if (!iprop || !*iprop) {
261                 dev_err(&pdev->dev, "codec bus-frequency property is missing or invalid\n");
262                 ret = -EINVAL;
263                 goto error;
264         }
265         mdata->clk_frequency = be32_to_cpup(iprop);
266 
267         if (!mdata->clk_frequency) {
268                 dev_err(&pdev->dev, "unknown clock frequency\n");
269                 ret = -EINVAL;
270                 goto error;
271         }
272 
273         /* Find the playback DMA channel to use. */
274         mdata->dai[0].platform_name = mdata->platform_name[0];
275         ret = fsl_asoc_get_dma_channel(np, "fsl,playback-dma", &mdata->dai[0],
276                                        &mdata->dma_channel_id[0],
277                                        &mdata->dma_id[0]);
278         if (ret) {
279                 dev_err(&pdev->dev, "missing/invalid playback DMA phandle (ret=%i)\n",
280                         ret);
281                 goto error;
282         }
283 
284         /* Find the capture DMA channel to use. */
285         mdata->dai[1].platform_name = mdata->platform_name[1];
286         ret = fsl_asoc_get_dma_channel(np, "fsl,capture-dma", &mdata->dai[1],
287                                        &mdata->dma_channel_id[1],
288                                        &mdata->dma_id[1]);
289         if (ret) {
290                 dev_err(&pdev->dev, "missing/invalid capture DMA phandle (ret=%i)\n",
291                         ret);
292                 goto error;
293         }
294 
295         /* Initialize our DAI data structure.  */
296         mdata->dai[0].stream_name = "playback";
297         mdata->dai[1].stream_name = "capture";
298         mdata->dai[0].name = mdata->dai[0].stream_name;
299         mdata->dai[1].name = mdata->dai[1].stream_name;
300 
301         mdata->card.probe = p1022_rdk_machine_probe;
302         mdata->card.remove = p1022_rdk_machine_remove;
303         mdata->card.name = pdev->name; /* The platform driver name */
304         mdata->card.owner = THIS_MODULE;
305         mdata->card.dev = &pdev->dev;
306         mdata->card.num_links = 2;
307         mdata->card.dai_link = mdata->dai;
308 
309         /* Register with ASoC */
310         ret = snd_soc_register_card(&mdata->card);
311         if (ret) {
312                 dev_err(&pdev->dev, "could not register card (ret=%i)\n", ret);
313                 goto error;
314         }
315 
316         return 0;
317 
318 error:
319         kfree(mdata);
320 error_put:
321         of_node_put(codec_np);
322         return ret;
323 }
324 
325 /**
326  * p1022_rdk_remove: remove the platform device
327  *
328  * This function is called when the platform device is removed.
329  */
330 static int p1022_rdk_remove(struct platform_device *pdev)
331 {
332         struct snd_soc_card *card = platform_get_drvdata(pdev);
333         struct machine_data *mdata =
334                 container_of(card, struct machine_data, card);
335 
336         snd_soc_unregister_card(card);
337         kfree(mdata);
338 
339         return 0;
340 }
341 
342 static struct platform_driver p1022_rdk_driver = {
343         .probe = p1022_rdk_probe,
344         .remove = p1022_rdk_remove,
345         .driver = {
346                 /*
347                  * The name must match 'compatible' property in the device tree,
348                  * in lowercase letters.
349                  */
350                 .name = "snd-soc-p1022rdk",
351                 .owner = THIS_MODULE,
352         },
353 };
354 
355 /**
356  * p1022_rdk_init: machine driver initialization.
357  *
358  * This function is called when this module is loaded.
359  */
360 static int __init p1022_rdk_init(void)
361 {
362         struct device_node *guts_np;
363         struct resource res;
364 
365         /* Get the physical address of the global utilities registers */
366         guts_np = of_find_compatible_node(NULL, NULL, "fsl,p1022-guts");
367         if (of_address_to_resource(guts_np, 0, &res)) {
368                 pr_err("snd-soc-p1022rdk: missing/invalid global utils node\n");
369                 of_node_put(guts_np);
370                 return -EINVAL;
371         }
372         guts_phys = res.start;
373         of_node_put(guts_np);
374 
375         return platform_driver_register(&p1022_rdk_driver);
376 }
377 
378 /**
379  * p1022_rdk_exit: machine driver exit
380  *
381  * This function is called when this driver is unloaded.
382  */
383 static void __exit p1022_rdk_exit(void)
384 {
385         platform_driver_unregister(&p1022_rdk_driver);
386 }
387 
388 late_initcall(p1022_rdk_init);
389 module_exit(p1022_rdk_exit);
390 
391 MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
392 MODULE_DESCRIPTION("Freescale / iVeia P1022 RDK ALSA SoC machine driver");
393 MODULE_LICENSE("GPL v2");
394 

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