1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Freescale P1022DS ALSA SoC Machine driver
4 //
5 // Author: Timur Tabi <timur@freescale.com>
6 //
7 // Copyright 2010 Freescale Semiconductor, Inc.
8
9 #include <linux/module.h>
10 #include <linux/fsl/guts.h>
11 #include <linux/interrupt.h>
12 #include <linux/of.h>
13 #include <linux/of_address.h>
14 #include <linux/slab.h>
15 #include <sound/soc.h>
16
17 #include "fsl_dma.h"
18 #include "fsl_ssi.h"
19 #include "fsl_utils.h"
20
21 /* P1022-specific PMUXCR and DMUXCR bit definitions */
22
23 #define CCSR_GUTS_PMUXCR_UART0_I2C1_MASK 0x0001c000
24 #define CCSR_GUTS_PMUXCR_UART0_I2C1_UART0_SSI 0x00010000
25 #define CCSR_GUTS_PMUXCR_UART0_I2C1_SSI 0x00018000
26
27 #define CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK 0x00000c00
28 #define CCSR_GUTS_PMUXCR_SSI_DMA_TDM_SSI 0x00000000
29
30 #define CCSR_GUTS_DMUXCR_PAD 1 /* DMA controller/channel set to pad */
31 #define CCSR_GUTS_DMUXCR_SSI 2 /* DMA controller/channel set to SSI */
32
33 /*
34 * Set the DMACR register in the GUTS
35 *
36 * The DMACR register determines the source of initiated transfers for each
37 * channel on each DMA controller. Rather than have a bunch of repetitive
38 * macros for the bit patterns, we just have a function that calculates
39 * them.
40 *
41 * guts: Pointer to GUTS structure
42 * co: The DMA controller (0 or 1)
43 * ch: The channel on the DMA controller (0, 1, 2, or 3)
44 * device: The device to set as the target (CCSR_GUTS_DMUXCR_xxx)
45 */
guts_set_dmuxcr(struct ccsr_guts __iomem * guts,unsigned int co,unsigned int ch,unsigned int device)46 static inline void guts_set_dmuxcr(struct ccsr_guts __iomem *guts,
47 unsigned int co, unsigned int ch, unsigned int device)
48 {
49 unsigned int shift = 16 + (8 * (1 - co) + 2 * (3 - ch));
50
51 clrsetbits_be32(&guts->dmuxcr, 3 << shift, device << shift);
52 }
53
54 /* There's only one global utilities register */
55 static phys_addr_t guts_phys;
56
57 /**
58 * machine_data: machine-specific ASoC device data
59 *
60 * This structure contains data for a single sound platform device on an
61 * P1022 DS. Some of the data is taken from the device tree.
62 */
63 struct machine_data {
64 struct snd_soc_dai_link dai[2];
65 struct snd_soc_card card;
66 unsigned int dai_format;
67 unsigned int codec_clk_direction;
68 unsigned int cpu_clk_direction;
69 unsigned int clk_frequency;
70 unsigned int ssi_id; /* 0 = SSI1, 1 = SSI2, etc */
71 unsigned int dma_id[2]; /* 0 = DMA1, 1 = DMA2, etc */
72 unsigned int dma_channel_id[2]; /* 0 = ch 0, 1 = ch 1, etc*/
73 char platform_name[2][DAI_NAME_SIZE]; /* One for each DMA channel */
74 };
75
76 /**
77 * p1022_ds_machine_probe: initialize the board
78 *
79 * This function is used to initialize the board-specific hardware.
80 *
81 * Here we program the DMACR and PMUXCR registers.
82 */
p1022_ds_machine_probe(struct snd_soc_card * card)83 static int p1022_ds_machine_probe(struct snd_soc_card *card)
84 {
85 struct machine_data *mdata =
86 container_of(card, struct machine_data, card);
87 struct ccsr_guts __iomem *guts;
88
89 guts = ioremap(guts_phys, sizeof(struct ccsr_guts));
90 if (!guts) {
91 dev_err(card->dev, "could not map global utilities\n");
92 return -ENOMEM;
93 }
94
95 /* Enable SSI Tx signal */
96 clrsetbits_be32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_UART0_I2C1_MASK,
97 CCSR_GUTS_PMUXCR_UART0_I2C1_UART0_SSI);
98
99 /* Enable SSI Rx signal */
100 clrsetbits_be32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK,
101 CCSR_GUTS_PMUXCR_SSI_DMA_TDM_SSI);
102
103 /* Enable DMA Channel for SSI */
104 guts_set_dmuxcr(guts, mdata->dma_id[0], mdata->dma_channel_id[0],
105 CCSR_GUTS_DMUXCR_SSI);
106
107 guts_set_dmuxcr(guts, mdata->dma_id[1], mdata->dma_channel_id[1],
108 CCSR_GUTS_DMUXCR_SSI);
109
110 iounmap(guts);
111
112 return 0;
113 }
114
115 /**
116 * p1022_ds_startup: program the board with various hardware parameters
117 *
118 * This function takes board-specific information, like clock frequencies
119 * and serial data formats, and passes that information to the codec and
120 * transport drivers.
121 */
p1022_ds_startup(struct snd_pcm_substream * substream)122 static int p1022_ds_startup(struct snd_pcm_substream *substream)
123 {
124 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
125 struct machine_data *mdata =
126 container_of(rtd->card, struct machine_data, card);
127 struct device *dev = rtd->card->dev;
128 int ret = 0;
129
130 /* Tell the codec driver what the serial protocol is. */
131 ret = snd_soc_dai_set_fmt(snd_soc_rtd_to_codec(rtd, 0), mdata->dai_format);
132 if (ret < 0) {
133 dev_err(dev, "could not set codec driver audio format\n");
134 return ret;
135 }
136
137 /*
138 * Tell the codec driver what the MCLK frequency is, and whether it's
139 * a slave or master.
140 */
141 ret = snd_soc_dai_set_sysclk(snd_soc_rtd_to_codec(rtd, 0), 0, mdata->clk_frequency,
142 mdata->codec_clk_direction);
143 if (ret < 0) {
144 dev_err(dev, "could not set codec driver clock params\n");
145 return ret;
146 }
147
148 return 0;
149 }
150
151 /**
152 * p1022_ds_machine_remove: Remove the sound device
153 *
154 * This function is called to remove the sound device for one SSI. We
155 * de-program the DMACR and PMUXCR register.
156 */
p1022_ds_machine_remove(struct snd_soc_card * card)157 static int p1022_ds_machine_remove(struct snd_soc_card *card)
158 {
159 struct machine_data *mdata =
160 container_of(card, struct machine_data, card);
161 struct ccsr_guts __iomem *guts;
162
163 guts = ioremap(guts_phys, sizeof(struct ccsr_guts));
164 if (!guts) {
165 dev_err(card->dev, "could not map global utilities\n");
166 return -ENOMEM;
167 }
168
169 /* Restore the signal routing */
170 clrbits32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_UART0_I2C1_MASK);
171 clrbits32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK);
172 guts_set_dmuxcr(guts, mdata->dma_id[0], mdata->dma_channel_id[0], 0);
173 guts_set_dmuxcr(guts, mdata->dma_id[1], mdata->dma_channel_id[1], 0);
174
175 iounmap(guts);
176
177 return 0;
178 }
179
180 /**
181 * p1022_ds_ops: ASoC machine driver operations
182 */
183 static const struct snd_soc_ops p1022_ds_ops = {
184 .startup = p1022_ds_startup,
185 };
186
187 /**
188 * p1022_ds_probe: platform probe function for the machine driver
189 *
190 * Although this is a machine driver, the SSI node is the "master" node with
191 * respect to audio hardware connections. Therefore, we create a new ASoC
192 * device for each new SSI node that has a codec attached.
193 */
p1022_ds_probe(struct platform_device * pdev)194 static int p1022_ds_probe(struct platform_device *pdev)
195 {
196 struct device *dev = pdev->dev.parent;
197 /* ssi_pdev is the platform device for the SSI node that probed us */
198 struct platform_device *ssi_pdev = to_platform_device(dev);
199 struct device_node *np = ssi_pdev->dev.of_node;
200 struct device_node *codec_np = NULL;
201 struct machine_data *mdata;
202 struct snd_soc_dai_link_component *comp;
203 int ret;
204 const char *sprop;
205 const u32 *iprop;
206
207 /* Find the codec node for this SSI. */
208 codec_np = of_parse_phandle(np, "codec-handle", 0);
209 if (!codec_np) {
210 dev_err(dev, "could not find codec node\n");
211 return -EINVAL;
212 }
213
214 mdata = kzalloc(sizeof(struct machine_data), GFP_KERNEL);
215 if (!mdata) {
216 ret = -ENOMEM;
217 goto error_put;
218 }
219
220 comp = devm_kzalloc(&pdev->dev, 6 * sizeof(*comp), GFP_KERNEL);
221 if (!comp) {
222 ret = -ENOMEM;
223 goto error_put;
224 }
225
226 mdata->dai[0].cpus = &comp[0];
227 mdata->dai[0].codecs = &comp[1];
228 mdata->dai[0].platforms = &comp[2];
229
230 mdata->dai[0].num_cpus = 1;
231 mdata->dai[0].num_codecs = 1;
232 mdata->dai[0].num_platforms = 1;
233
234 mdata->dai[1].cpus = &comp[3];
235 mdata->dai[1].codecs = &comp[4];
236 mdata->dai[1].platforms = &comp[5];
237
238 mdata->dai[1].num_cpus = 1;
239 mdata->dai[1].num_codecs = 1;
240 mdata->dai[1].num_platforms = 1;
241
242
243 mdata->dai[0].cpus->dai_name = dev_name(&ssi_pdev->dev);
244 mdata->dai[0].ops = &p1022_ds_ops;
245
246 /* ASoC core can match codec with device node */
247 mdata->dai[0].codecs->of_node = codec_np;
248
249 /* We register two DAIs per SSI, one for playback and the other for
250 * capture. We support codecs that have separate DAIs for both playback
251 * and capture.
252 */
253 memcpy(&mdata->dai[1], &mdata->dai[0], sizeof(struct snd_soc_dai_link));
254
255 /* The DAI names from the codec (snd_soc_dai_driver.name) */
256 mdata->dai[0].codecs->dai_name = "wm8776-hifi-playback";
257 mdata->dai[1].codecs->dai_name = "wm8776-hifi-capture";
258
259 /* Get the device ID */
260 iprop = of_get_property(np, "cell-index", NULL);
261 if (!iprop) {
262 dev_err(&pdev->dev, "cell-index property not found\n");
263 ret = -EINVAL;
264 goto error;
265 }
266 mdata->ssi_id = be32_to_cpup(iprop);
267
268 /* Get the serial format and clock direction. */
269 sprop = of_get_property(np, "fsl,mode", NULL);
270 if (!sprop) {
271 dev_err(&pdev->dev, "fsl,mode property not found\n");
272 ret = -EINVAL;
273 goto error;
274 }
275
276 if (strcasecmp(sprop, "i2s-slave") == 0) {
277 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
278 SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBP_CFP;
279 mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
280 mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
281
282 /* In i2s-slave mode, the codec has its own clock source, so we
283 * need to get the frequency from the device tree and pass it to
284 * the codec driver.
285 */
286 iprop = of_get_property(codec_np, "clock-frequency", NULL);
287 if (!iprop || !*iprop) {
288 dev_err(&pdev->dev, "codec bus-frequency "
289 "property is missing or invalid\n");
290 ret = -EINVAL;
291 goto error;
292 }
293 mdata->clk_frequency = be32_to_cpup(iprop);
294 } else if (strcasecmp(sprop, "i2s-master") == 0) {
295 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
296 SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBC_CFC;
297 mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
298 mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
299 } else if (strcasecmp(sprop, "lj-slave") == 0) {
300 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
301 SND_SOC_DAIFMT_LEFT_J | SND_SOC_DAIFMT_CBP_CFP;
302 mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
303 mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
304 } else if (strcasecmp(sprop, "lj-master") == 0) {
305 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
306 SND_SOC_DAIFMT_LEFT_J | SND_SOC_DAIFMT_CBC_CFC;
307 mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
308 mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
309 } else if (strcasecmp(sprop, "rj-slave") == 0) {
310 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
311 SND_SOC_DAIFMT_RIGHT_J | SND_SOC_DAIFMT_CBP_CFP;
312 mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
313 mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
314 } else if (strcasecmp(sprop, "rj-master") == 0) {
315 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
316 SND_SOC_DAIFMT_RIGHT_J | SND_SOC_DAIFMT_CBC_CFC;
317 mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
318 mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
319 } else if (strcasecmp(sprop, "ac97-slave") == 0) {
320 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
321 SND_SOC_DAIFMT_AC97 | SND_SOC_DAIFMT_CBP_CFP;
322 mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
323 mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
324 } else if (strcasecmp(sprop, "ac97-master") == 0) {
325 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
326 SND_SOC_DAIFMT_AC97 | SND_SOC_DAIFMT_CBC_CFC;
327 mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
328 mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
329 } else {
330 dev_err(&pdev->dev,
331 "unrecognized fsl,mode property '%s'\n", sprop);
332 ret = -EINVAL;
333 goto error;
334 }
335
336 if (!mdata->clk_frequency) {
337 dev_err(&pdev->dev, "unknown clock frequency\n");
338 ret = -EINVAL;
339 goto error;
340 }
341
342 /* Find the playback DMA channel to use. */
343 mdata->dai[0].platforms->name = mdata->platform_name[0];
344 ret = fsl_asoc_get_dma_channel(np, "fsl,playback-dma", &mdata->dai[0],
345 &mdata->dma_channel_id[0],
346 &mdata->dma_id[0]);
347 if (ret) {
348 dev_err(&pdev->dev, "missing/invalid playback DMA phandle\n");
349 goto error;
350 }
351
352 /* Find the capture DMA channel to use. */
353 mdata->dai[1].platforms->name = mdata->platform_name[1];
354 ret = fsl_asoc_get_dma_channel(np, "fsl,capture-dma", &mdata->dai[1],
355 &mdata->dma_channel_id[1],
356 &mdata->dma_id[1]);
357 if (ret) {
358 dev_err(&pdev->dev, "missing/invalid capture DMA phandle\n");
359 goto error;
360 }
361
362 /* Initialize our DAI data structure. */
363 mdata->dai[0].stream_name = "playback";
364 mdata->dai[1].stream_name = "capture";
365 mdata->dai[0].name = mdata->dai[0].stream_name;
366 mdata->dai[1].name = mdata->dai[1].stream_name;
367
368 mdata->card.probe = p1022_ds_machine_probe;
369 mdata->card.remove = p1022_ds_machine_remove;
370 mdata->card.name = pdev->name; /* The platform driver name */
371 mdata->card.owner = THIS_MODULE;
372 mdata->card.dev = &pdev->dev;
373 mdata->card.num_links = 2;
374 mdata->card.dai_link = mdata->dai;
375
376 /* Register with ASoC */
377 ret = snd_soc_register_card(&mdata->card);
378 if (ret) {
379 dev_err(&pdev->dev, "could not register card\n");
380 goto error;
381 }
382
383 of_node_put(codec_np);
384
385 return 0;
386
387 error:
388 kfree(mdata);
389 error_put:
390 of_node_put(codec_np);
391 return ret;
392 }
393
394 /**
395 * p1022_ds_remove: remove the platform device
396 *
397 * This function is called when the platform device is removed.
398 */
p1022_ds_remove(struct platform_device * pdev)399 static void p1022_ds_remove(struct platform_device *pdev)
400 {
401 struct snd_soc_card *card = platform_get_drvdata(pdev);
402 struct machine_data *mdata =
403 container_of(card, struct machine_data, card);
404
405 snd_soc_unregister_card(card);
406 kfree(mdata);
407 }
408
409 static struct platform_driver p1022_ds_driver = {
410 .probe = p1022_ds_probe,
411 .remove = p1022_ds_remove,
412 .driver = {
413 /*
414 * The name must match 'compatible' property in the device tree,
415 * in lowercase letters.
416 */
417 .name = "snd-soc-p1022ds",
418 },
419 };
420
421 /**
422 * p1022_ds_init: machine driver initialization.
423 *
424 * This function is called when this module is loaded.
425 */
p1022_ds_init(void)426 static int __init p1022_ds_init(void)
427 {
428 struct device_node *guts_np;
429 struct resource res;
430
431 /* Get the physical address of the global utilities registers */
432 guts_np = of_find_compatible_node(NULL, NULL, "fsl,p1022-guts");
433 if (of_address_to_resource(guts_np, 0, &res)) {
434 pr_err("snd-soc-p1022ds: missing/invalid global utils node\n");
435 of_node_put(guts_np);
436 return -EINVAL;
437 }
438 guts_phys = res.start;
439 of_node_put(guts_np);
440
441 return platform_driver_register(&p1022_ds_driver);
442 }
443
444 /**
445 * p1022_ds_exit: machine driver exit
446 *
447 * This function is called when this driver is unloaded.
448 */
p1022_ds_exit(void)449 static void __exit p1022_ds_exit(void)
450 {
451 platform_driver_unregister(&p1022_ds_driver);
452 }
453
454 module_init(p1022_ds_init);
455 module_exit(p1022_ds_exit);
456
457 MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
458 MODULE_DESCRIPTION("Freescale P1022 DS ALSA SoC machine driver");
459 MODULE_LICENSE("GPL v2");
460