Merge tag 'locks-v3.16-2' of git://git.samba.org/jlayton/linux
[linux/fpc-iii.git] / sound / soc / fsl / p1022_rdk.c
blob9d89bb028621b12ba1f5df6c6036d9859e192323
1 /**
2 * Freescale P1022RDK ALSA SoC Machine driver
4 * Author: Timur Tabi <timur@freescale.com>
6 * Copyright 2012 Freescale Semiconductor, Inc.
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.
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:
16 * amixer sset 'Left Output Mixer PCM' on
17 * amixer sset 'Right Output Mixer PCM' on
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>
28 #include "fsl_dma.h"
29 #include "fsl_ssi.h"
30 #include "fsl_utils.h"
32 /* P1022-specific PMUXCR and DMUXCR bit definitions */
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
38 #define CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK 0x00000c00
39 #define CCSR_GUTS_PMUXCR_SSI_DMA_TDM_SSI 0x00000000
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 */
45 * Set the DMACR register in the GUTS
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.
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)
57 static inline void guts_set_dmuxcr(struct ccsr_guts __iomem *guts,
58 unsigned int co, unsigned int ch, unsigned int device)
60 unsigned int shift = 16 + (8 * (1 - co) + 2 * (3 - ch));
62 clrsetbits_be32(&guts->dmuxcr, 3 << shift, device << shift);
65 /* There's only one global utilities register */
66 static phys_addr_t guts_phys;
68 /**
69 * machine_data: machine-specific ASoC device data
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.
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 */
86 /**
87 * p1022_rdk_machine_probe: initialize the board
89 * This function is used to initialize the board-specific hardware.
91 * Here we program the DMACR and PMUXCR registers.
93 static int p1022_rdk_machine_probe(struct snd_soc_card *card)
95 struct machine_data *mdata =
96 container_of(card, struct machine_data, card);
97 struct ccsr_guts __iomem *guts;
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;
105 /* Enable SSI Tx signal */
106 clrsetbits_be32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_UART0_I2C1_MASK,
107 CCSR_GUTS_PMUXCR_UART0_I2C1_UART0_SSI);
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);
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);
117 guts_set_dmuxcr(guts, mdata->dma_id[1], mdata->dma_channel_id[1],
118 CCSR_GUTS_DMUXCR_SSI);
120 iounmap(guts);
122 return 0;
126 * p1022_rdk_startup: program the board with various hardware parameters
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.
132 static int p1022_rdk_startup(struct snd_pcm_substream *substream)
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;
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;
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;
156 return 0;
160 * p1022_rdk_machine_remove: Remove the sound device
162 * This function is called to remove the sound device for one SSI. We
163 * de-program the DMACR and PMUXCR register.
165 static int p1022_rdk_machine_remove(struct snd_soc_card *card)
167 struct machine_data *mdata =
168 container_of(card, struct machine_data, card);
169 struct ccsr_guts __iomem *guts;
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;
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);
183 iounmap(guts);
185 return 0;
189 * p1022_rdk_ops: ASoC machine driver operations
191 static struct snd_soc_ops p1022_rdk_ops = {
192 .startup = p1022_rdk_startup,
196 * p1022_rdk_probe: platform probe function for the machine driver
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.
202 static int p1022_rdk_probe(struct platform_device *pdev)
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;
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;
221 mdata = kzalloc(sizeof(struct machine_data), GFP_KERNEL);
222 if (!mdata) {
223 ret = -ENOMEM;
224 goto error_put;
227 mdata->dai[0].cpu_dai_name = dev_name(&ssi_pdev->dev);
228 mdata->dai[0].ops = &p1022_rdk_ops;
230 /* ASoC core can match codec with device node */
231 mdata->dai[0].codec_of_node = codec_np;
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.
238 memcpy(&mdata->dai[1], &mdata->dai[0], sizeof(struct snd_soc_dai_link));
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;
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.
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;
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.
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;
265 mdata->clk_frequency = be32_to_cpup(iprop);
267 if (!mdata->clk_frequency) {
268 dev_err(&pdev->dev, "unknown clock frequency\n");
269 ret = -EINVAL;
270 goto error;
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;
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;
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;
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;
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;
316 return 0;
318 error:
319 kfree(mdata);
320 error_put:
321 of_node_put(codec_np);
322 return ret;
326 * p1022_rdk_remove: remove the platform device
328 * This function is called when the platform device is removed.
330 static int p1022_rdk_remove(struct platform_device *pdev)
332 struct snd_soc_card *card = platform_get_drvdata(pdev);
333 struct machine_data *mdata =
334 container_of(card, struct machine_data, card);
336 snd_soc_unregister_card(card);
337 kfree(mdata);
339 return 0;
342 static struct platform_driver p1022_rdk_driver = {
343 .probe = p1022_rdk_probe,
344 .remove = p1022_rdk_remove,
345 .driver = {
347 * The name must match 'compatible' property in the device tree,
348 * in lowercase letters.
350 .name = "snd-soc-p1022rdk",
351 .owner = THIS_MODULE,
356 * p1022_rdk_init: machine driver initialization.
358 * This function is called when this module is loaded.
360 static int __init p1022_rdk_init(void)
362 struct device_node *guts_np;
363 struct resource res;
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;
372 guts_phys = res.start;
373 of_node_put(guts_np);
375 return platform_driver_register(&p1022_rdk_driver);
379 * p1022_rdk_exit: machine driver exit
381 * This function is called when this driver is unloaded.
383 static void __exit p1022_rdk_exit(void)
385 platform_driver_unregister(&p1022_rdk_driver);
388 late_initcall(p1022_rdk_init);
389 module_exit(p1022_rdk_exit);
391 MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
392 MODULE_DESCRIPTION("Freescale / iVeia P1022 RDK ALSA SoC machine driver");
393 MODULE_LICENSE("GPL v2");