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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/fsl/guts.h>
 22 #include <linux/interrupt.h>
 23 #include <linux/of_address.h>
 24 #include <linux/of_device.h>
 25 #include <linux/slab.h>
 26 #include <sound/soc.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 = to_platform_device(dev);
207         struct device_node *np = ssi_pdev->dev.of_node;
208         struct device_node *codec_np = NULL;
209         struct machine_data *mdata;
210         const u32 *iprop;
211         int ret;
212 
213         /* Find the codec node for this SSI. */
214         codec_np = of_parse_phandle(np, "codec-handle", 0);
215         if (!codec_np) {
216                 dev_err(dev, "could not find codec node\n");
217                 return -EINVAL;
218         }
219 
220         mdata = kzalloc(sizeof(struct machine_data), GFP_KERNEL);
221         if (!mdata) {
222                 ret = -ENOMEM;
223                 goto error_put;
224         }
225 
226         mdata->dai[0].cpu_dai_name = dev_name(&ssi_pdev->dev);
227         mdata->dai[0].ops = &p1022_rdk_ops;
228 
229         /* ASoC core can match codec with device node */
230         mdata->dai[0].codec_of_node = codec_np;
231 
232         /*
233          * We register two DAIs per SSI, one for playback and the other for
234          * capture.  We support codecs that have separate DAIs for both playback
235          * and capture.
236          */
237         memcpy(&mdata->dai[1], &mdata->dai[0], sizeof(struct snd_soc_dai_link));
238 
239         /* The DAI names from the codec (snd_soc_dai_driver.name) */
240         mdata->dai[0].codec_dai_name = "wm8960-hifi";
241         mdata->dai[1].codec_dai_name = mdata->dai[0].codec_dai_name;
242 
243         /*
244          * Configure the SSI for I2S slave mode.  Older device trees have
245          * an fsl,mode property, but we ignore that since there's really
246          * only one way to configure the SSI.
247          */
248         mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
249                 SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM;
250         mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
251         mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
252 
253         /*
254          * In i2s-slave mode, the codec has its own clock source, so we
255          * need to get the frequency from the device tree and pass it to
256          * the codec driver.
257          */
258         iprop = of_get_property(codec_np, "clock-frequency", NULL);
259         if (!iprop || !*iprop) {
260                 dev_err(&pdev->dev, "codec bus-frequency property is missing or invalid\n");
261                 ret = -EINVAL;
262                 goto error;
263         }
264         mdata->clk_frequency = be32_to_cpup(iprop);
265 
266         if (!mdata->clk_frequency) {
267                 dev_err(&pdev->dev, "unknown clock frequency\n");
268                 ret = -EINVAL;
269                 goto error;
270         }
271 
272         /* Find the playback DMA channel to use. */
273         mdata->dai[0].platform_name = mdata->platform_name[0];
274         ret = fsl_asoc_get_dma_channel(np, "fsl,playback-dma", &mdata->dai[0],
275                                        &mdata->dma_channel_id[0],
276                                        &mdata->dma_id[0]);
277         if (ret) {
278                 dev_err(&pdev->dev, "missing/invalid playback DMA phandle (ret=%i)\n",
279                         ret);
280                 goto error;
281         }
282 
283         /* Find the capture DMA channel to use. */
284         mdata->dai[1].platform_name = mdata->platform_name[1];
285         ret = fsl_asoc_get_dma_channel(np, "fsl,capture-dma", &mdata->dai[1],
286                                        &mdata->dma_channel_id[1],
287                                        &mdata->dma_id[1]);
288         if (ret) {
289                 dev_err(&pdev->dev, "missing/invalid capture DMA phandle (ret=%i)\n",
290                         ret);
291                 goto error;
292         }
293 
294         /* Initialize our DAI data structure.  */
295         mdata->dai[0].stream_name = "playback";
296         mdata->dai[1].stream_name = "capture";
297         mdata->dai[0].name = mdata->dai[0].stream_name;
298         mdata->dai[1].name = mdata->dai[1].stream_name;
299 
300         mdata->card.probe = p1022_rdk_machine_probe;
301         mdata->card.remove = p1022_rdk_machine_remove;
302         mdata->card.name = pdev->name; /* The platform driver name */
303         mdata->card.owner = THIS_MODULE;
304         mdata->card.dev = &pdev->dev;
305         mdata->card.num_links = 2;
306         mdata->card.dai_link = mdata->dai;
307 
308         /* Register with ASoC */
309         ret = snd_soc_register_card(&mdata->card);
310         if (ret) {
311                 dev_err(&pdev->dev, "could not register card (ret=%i)\n", ret);
312                 goto error;
313         }
314 
315         return 0;
316 
317 error:
318         kfree(mdata);
319 error_put:
320         of_node_put(codec_np);
321         return ret;
322 }
323 
324 /**
325  * p1022_rdk_remove: remove the platform device
326  *
327  * This function is called when the platform device is removed.
328  */
329 static int p1022_rdk_remove(struct platform_device *pdev)
330 {
331         struct snd_soc_card *card = platform_get_drvdata(pdev);
332         struct machine_data *mdata =
333                 container_of(card, struct machine_data, card);
334 
335         snd_soc_unregister_card(card);
336         kfree(mdata);
337 
338         return 0;
339 }
340 
341 static struct platform_driver p1022_rdk_driver = {
342         .probe = p1022_rdk_probe,
343         .remove = p1022_rdk_remove,
344         .driver = {
345                 /*
346                  * The name must match 'compatible' property in the device tree,
347                  * in lowercase letters.
348                  */
349                 .name = "snd-soc-p1022rdk",
350         },
351 };
352 
353 /**
354  * p1022_rdk_init: machine driver initialization.
355  *
356  * This function is called when this module is loaded.
357  */
358 static int __init p1022_rdk_init(void)
359 {
360         struct device_node *guts_np;
361         struct resource res;
362 
363         /* Get the physical address of the global utilities registers */
364         guts_np = of_find_compatible_node(NULL, NULL, "fsl,p1022-guts");
365         if (of_address_to_resource(guts_np, 0, &res)) {
366                 pr_err("snd-soc-p1022rdk: missing/invalid global utils node\n");
367                 of_node_put(guts_np);
368                 return -EINVAL;
369         }
370         guts_phys = res.start;
371         of_node_put(guts_np);
372 
373         return platform_driver_register(&p1022_rdk_driver);
374 }
375 
376 /**
377  * p1022_rdk_exit: machine driver exit
378  *
379  * This function is called when this driver is unloaded.
380  */
381 static void __exit p1022_rdk_exit(void)
382 {
383         platform_driver_unregister(&p1022_rdk_driver);
384 }
385 
386 late_initcall(p1022_rdk_init);
387 module_exit(p1022_rdk_exit);
388 
389 MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
390 MODULE_DESCRIPTION("Freescale / iVeia P1022 RDK ALSA SoC machine driver");
391 MODULE_LICENSE("GPL v2");
392 

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