1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Freescale P1022RDK ALSA SoC Machine driver
4 //
5 // Author: Timur Tabi <timur@freescale.com>
6 //
7 // Copyright 2012 Freescale Semiconductor, Inc.
8 //
9 // Note: in order for audio to work correctly, the output controls need
10 // to be enabled, because they control the clock. So for playback, for
11 // example:
12 //
13 // amixer sset 'Left Output Mixer PCM' on
14 // amixer sset 'Right Output Mixer PCM' on
15
16 #include <linux/module.h>
17 #include <linux/fsl/guts.h>
18 #include <linux/interrupt.h>
19 #include <linux/of_address.h>
20 #include <linux/of_device.h>
21 #include <linux/slab.h>
22 #include <sound/soc.h>
23
24 #include "fsl_dma.h"
25 #include "fsl_ssi.h"
26 #include "fsl_utils.h"
27
28 /* P1022-specific PMUXCR and DMUXCR bit definitions */
29
30 #define CCSR_GUTS_PMUXCR_UART0_I2C1_MASK 0x0001c000
31 #define CCSR_GUTS_PMUXCR_UART0_I2C1_UART0_SSI 0x00010000
32 #define CCSR_GUTS_PMUXCR_UART0_I2C1_SSI 0x00018000
33
34 #define CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK 0x00000c00
35 #define CCSR_GUTS_PMUXCR_SSI_DMA_TDM_SSI 0x00000000
36
37 #define CCSR_GUTS_DMUXCR_PAD 1 /* DMA controller/channel set to pad */
38 #define CCSR_GUTS_DMUXCR_SSI 2 /* DMA controller/channel set to SSI */
39
40 /*
41 * Set the DMACR register in the GUTS
42 *
43 * The DMACR register determines the source of initiated transfers for each
44 * channel on each DMA controller. Rather than have a bunch of repetitive
45 * macros for the bit patterns, we just have a function that calculates
46 * them.
47 *
48 * guts: Pointer to GUTS structure
49 * co: The DMA controller (0 or 1)
50 * ch: The channel on the DMA controller (0, 1, 2, or 3)
51 * device: The device to set as the target (CCSR_GUTS_DMUXCR_xxx)
52 */
guts_set_dmuxcr(struct ccsr_guts __iomem * guts,unsigned int co,unsigned int ch,unsigned int device)53 static inline void guts_set_dmuxcr(struct ccsr_guts __iomem *guts,
54 unsigned int co, unsigned int ch, unsigned int device)
55 {
56 unsigned int shift = 16 + (8 * (1 - co) + 2 * (3 - ch));
57
58 clrsetbits_be32(&guts->dmuxcr, 3 << shift, device << shift);
59 }
60
61 /* There's only one global utilities register */
62 static phys_addr_t guts_phys;
63
64 /**
65 * machine_data: machine-specific ASoC device data
66 *
67 * This structure contains data for a single sound platform device on an
68 * P1022 RDK. Some of the data is taken from the device tree.
69 */
70 struct machine_data {
71 struct snd_soc_dai_link dai[2];
72 struct snd_soc_card card;
73 unsigned int dai_format;
74 unsigned int codec_clk_direction;
75 unsigned int cpu_clk_direction;
76 unsigned int clk_frequency;
77 unsigned int dma_id[2]; /* 0 = DMA1, 1 = DMA2, etc */
78 unsigned int dma_channel_id[2]; /* 0 = ch 0, 1 = ch 1, etc*/
79 char platform_name[2][DAI_NAME_SIZE]; /* One for each DMA channel */
80 };
81
82 /**
83 * p1022_rdk_machine_probe: initialize the board
84 *
85 * This function is used to initialize the board-specific hardware.
86 *
87 * Here we program the DMACR and PMUXCR registers.
88 */
p1022_rdk_machine_probe(struct snd_soc_card * card)89 static int p1022_rdk_machine_probe(struct snd_soc_card *card)
90 {
91 struct machine_data *mdata =
92 container_of(card, struct machine_data, card);
93 struct ccsr_guts __iomem *guts;
94
95 guts = ioremap(guts_phys, sizeof(struct ccsr_guts));
96 if (!guts) {
97 dev_err(card->dev, "could not map global utilities\n");
98 return -ENOMEM;
99 }
100
101 /* Enable SSI Tx signal */
102 clrsetbits_be32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_UART0_I2C1_MASK,
103 CCSR_GUTS_PMUXCR_UART0_I2C1_UART0_SSI);
104
105 /* Enable SSI Rx signal */
106 clrsetbits_be32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK,
107 CCSR_GUTS_PMUXCR_SSI_DMA_TDM_SSI);
108
109 /* Enable DMA Channel for SSI */
110 guts_set_dmuxcr(guts, mdata->dma_id[0], mdata->dma_channel_id[0],
111 CCSR_GUTS_DMUXCR_SSI);
112
113 guts_set_dmuxcr(guts, mdata->dma_id[1], mdata->dma_channel_id[1],
114 CCSR_GUTS_DMUXCR_SSI);
115
116 iounmap(guts);
117
118 return 0;
119 }
120
121 /**
122 * p1022_rdk_startup: program the board with various hardware parameters
123 *
124 * This function takes board-specific information, like clock frequencies
125 * and serial data formats, and passes that information to the codec and
126 * transport drivers.
127 */
p1022_rdk_startup(struct snd_pcm_substream * substream)128 static int p1022_rdk_startup(struct snd_pcm_substream *substream)
129 {
130 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
131 struct machine_data *mdata =
132 container_of(rtd->card, struct machine_data, card);
133 struct device *dev = rtd->card->dev;
134 int ret = 0;
135
136 /* Tell the codec driver what the serial protocol is. */
137 ret = snd_soc_dai_set_fmt(asoc_rtd_to_codec(rtd, 0), mdata->dai_format);
138 if (ret < 0) {
139 dev_err(dev, "could not set codec driver audio format (ret=%i)\n",
140 ret);
141 return ret;
142 }
143
144 ret = snd_soc_dai_set_pll(asoc_rtd_to_codec(rtd, 0), 0, 0, mdata->clk_frequency,
145 mdata->clk_frequency);
146 if (ret < 0) {
147 dev_err(dev, "could not set codec PLL frequency (ret=%i)\n",
148 ret);
149 return ret;
150 }
151
152 return 0;
153 }
154
155 /**
156 * p1022_rdk_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 */
p1022_rdk_machine_remove(struct snd_soc_card * card)161 static int p1022_rdk_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_rdk_ops: ASoC machine driver operations
186 */
187 static const struct snd_soc_ops p1022_rdk_ops = {
188 .startup = p1022_rdk_startup,
189 };
190
191 /**
192 * p1022_rdk_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 */
p1022_rdk_probe(struct platform_device * pdev)198 static int p1022_rdk_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 struct snd_soc_dai_link_component *comp;
207 const u32 *iprop;
208 int ret;
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 comp = devm_kzalloc(&pdev->dev, 6 * sizeof(*comp), GFP_KERNEL);
224 if (!comp) {
225 ret = -ENOMEM;
226 goto error_put;
227 }
228
229 mdata->dai[0].cpus = &comp[0];
230 mdata->dai[0].codecs = &comp[1];
231 mdata->dai[0].platforms = &comp[2];
232
233 mdata->dai[0].num_cpus = 1;
234 mdata->dai[0].num_codecs = 1;
235 mdata->dai[0].num_platforms = 1;
236
237 mdata->dai[1].cpus = &comp[3];
238 mdata->dai[1].codecs = &comp[4];
239 mdata->dai[1].platforms = &comp[5];
240
241 mdata->dai[1].num_cpus = 1;
242 mdata->dai[1].num_codecs = 1;
243 mdata->dai[1].num_platforms = 1;
244
245 mdata->dai[0].cpus->dai_name = dev_name(&ssi_pdev->dev);
246 mdata->dai[0].ops = &p1022_rdk_ops;
247
248 /* ASoC core can match codec with device node */
249 mdata->dai[0].codecs->of_node = codec_np;
250
251 /*
252 * We register two DAIs per SSI, one for playback and the other for
253 * capture. We support codecs that have separate DAIs for both playback
254 * and capture.
255 */
256 memcpy(&mdata->dai[1], &mdata->dai[0], sizeof(struct snd_soc_dai_link));
257
258 /* The DAI names from the codec (snd_soc_dai_driver.name) */
259 mdata->dai[0].codecs->dai_name = "wm8960-hifi";
260 mdata->dai[1].codecs->dai_name = mdata->dai[0].codecs->dai_name;
261
262 /*
263 * Configure the SSI for I2S slave mode. Older device trees have
264 * an fsl,mode property, but we ignore that since there's really
265 * only one way to configure the SSI.
266 */
267 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
268 SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBP_CFP;
269 mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
270 mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
271
272 /*
273 * In i2s-slave mode, the codec has its own clock source, so we
274 * need to get the frequency from the device tree and pass it to
275 * the codec driver.
276 */
277 iprop = of_get_property(codec_np, "clock-frequency", NULL);
278 if (!iprop || !*iprop) {
279 dev_err(&pdev->dev, "codec bus-frequency property is missing or invalid\n");
280 ret = -EINVAL;
281 goto error;
282 }
283 mdata->clk_frequency = be32_to_cpup(iprop);
284
285 if (!mdata->clk_frequency) {
286 dev_err(&pdev->dev, "unknown clock frequency\n");
287 ret = -EINVAL;
288 goto error;
289 }
290
291 /* Find the playback DMA channel to use. */
292 mdata->dai[0].platforms->name = mdata->platform_name[0];
293 ret = fsl_asoc_get_dma_channel(np, "fsl,playback-dma", &mdata->dai[0],
294 &mdata->dma_channel_id[0],
295 &mdata->dma_id[0]);
296 if (ret) {
297 dev_err(&pdev->dev, "missing/invalid playback DMA phandle (ret=%i)\n",
298 ret);
299 goto error;
300 }
301
302 /* Find the capture DMA channel to use. */
303 mdata->dai[1].platforms->name = mdata->platform_name[1];
304 ret = fsl_asoc_get_dma_channel(np, "fsl,capture-dma", &mdata->dai[1],
305 &mdata->dma_channel_id[1],
306 &mdata->dma_id[1]);
307 if (ret) {
308 dev_err(&pdev->dev, "missing/invalid capture DMA phandle (ret=%i)\n",
309 ret);
310 goto error;
311 }
312
313 /* Initialize our DAI data structure. */
314 mdata->dai[0].stream_name = "playback";
315 mdata->dai[1].stream_name = "capture";
316 mdata->dai[0].name = mdata->dai[0].stream_name;
317 mdata->dai[1].name = mdata->dai[1].stream_name;
318
319 mdata->card.probe = p1022_rdk_machine_probe;
320 mdata->card.remove = p1022_rdk_machine_remove;
321 mdata->card.name = pdev->name; /* The platform driver name */
322 mdata->card.owner = THIS_MODULE;
323 mdata->card.dev = &pdev->dev;
324 mdata->card.num_links = 2;
325 mdata->card.dai_link = mdata->dai;
326
327 /* Register with ASoC */
328 ret = snd_soc_register_card(&mdata->card);
329 if (ret) {
330 dev_err(&pdev->dev, "could not register card (ret=%i)\n", ret);
331 goto error;
332 }
333
334 return 0;
335
336 error:
337 kfree(mdata);
338 error_put:
339 of_node_put(codec_np);
340 return ret;
341 }
342
343 /**
344 * p1022_rdk_remove: remove the platform device
345 *
346 * This function is called when the platform device is removed.
347 */
p1022_rdk_remove(struct platform_device * pdev)348 static void p1022_rdk_remove(struct platform_device *pdev)
349 {
350 struct snd_soc_card *card = platform_get_drvdata(pdev);
351 struct machine_data *mdata =
352 container_of(card, struct machine_data, card);
353
354 snd_soc_unregister_card(card);
355 kfree(mdata);
356 }
357
358 static struct platform_driver p1022_rdk_driver = {
359 .probe = p1022_rdk_probe,
360 .remove_new = p1022_rdk_remove,
361 .driver = {
362 /*
363 * The name must match 'compatible' property in the device tree,
364 * in lowercase letters.
365 */
366 .name = "snd-soc-p1022rdk",
367 },
368 };
369
370 /**
371 * p1022_rdk_init: machine driver initialization.
372 *
373 * This function is called when this module is loaded.
374 */
p1022_rdk_init(void)375 static int __init p1022_rdk_init(void)
376 {
377 struct device_node *guts_np;
378 struct resource res;
379
380 /* Get the physical address of the global utilities registers */
381 guts_np = of_find_compatible_node(NULL, NULL, "fsl,p1022-guts");
382 if (of_address_to_resource(guts_np, 0, &res)) {
383 pr_err("snd-soc-p1022rdk: missing/invalid global utils node\n");
384 of_node_put(guts_np);
385 return -EINVAL;
386 }
387 guts_phys = res.start;
388 of_node_put(guts_np);
389
390 return platform_driver_register(&p1022_rdk_driver);
391 }
392
393 /**
394 * p1022_rdk_exit: machine driver exit
395 *
396 * This function is called when this driver is unloaded.
397 */
p1022_rdk_exit(void)398 static void __exit p1022_rdk_exit(void)
399 {
400 platform_driver_unregister(&p1022_rdk_driver);
401 }
402
403 late_initcall(p1022_rdk_init);
404 module_exit(p1022_rdk_exit);
405
406 MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
407 MODULE_DESCRIPTION("Freescale / iVeia P1022 RDK ALSA SoC machine driver");
408 MODULE_LICENSE("GPL v2");
409