Andra Danciu | 8acfeb6 | 2019-04-05 14:50:07 +0300 | [diff] [blame] | 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 |
Timur Tabi | 96a0af6 | 2012-10-12 14:09:18 -0500 | [diff] [blame] | 15 | |
| 16 | #include <linux/module.h> |
Scott Wood | 9484865 | 2015-09-19 23:29:53 -0500 | [diff] [blame] | 17 | #include <linux/fsl/guts.h> |
Timur Tabi | 96a0af6 | 2012-10-12 14:09:18 -0500 | [diff] [blame] | 18 | #include <linux/interrupt.h> |
Rob Herring | 5af5073 | 2013-09-17 14:28:33 -0500 | [diff] [blame] | 19 | #include <linux/of_address.h> |
Timur Tabi | 96a0af6 | 2012-10-12 14:09:18 -0500 | [diff] [blame] | 20 | #include <linux/of_device.h> |
| 21 | #include <linux/slab.h> |
| 22 | #include <sound/soc.h> |
Timur Tabi | 96a0af6 | 2012-10-12 14:09:18 -0500 | [diff] [blame] | 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 | */ |
| 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 | */ |
| 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 | */ |
| 128 | static int p1022_rdk_startup(struct snd_pcm_substream *substream) |
| 129 | { |
Kuninori Morimoto | 9f5f078 | 2020-07-20 10:18:38 +0900 | [diff] [blame] | 130 | struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); |
Timur Tabi | 96a0af6 | 2012-10-12 14:09:18 -0500 | [diff] [blame] | 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. */ |
Kuninori Morimoto | 17198ae | 2020-03-23 14:18:30 +0900 | [diff] [blame] | 137 | ret = snd_soc_dai_set_fmt(asoc_rtd_to_codec(rtd, 0), mdata->dai_format); |
Timur Tabi | 96a0af6 | 2012-10-12 14:09:18 -0500 | [diff] [blame] | 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 | |
Kuninori Morimoto | 17198ae | 2020-03-23 14:18:30 +0900 | [diff] [blame] | 144 | ret = snd_soc_dai_set_pll(asoc_rtd_to_codec(rtd, 0), 0, 0, mdata->clk_frequency, |
Timur Tabi | 96a0af6 | 2012-10-12 14:09:18 -0500 | [diff] [blame] | 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 | */ |
| 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 | */ |
Bhumika Goyal | 5ace37b | 2017-03-14 00:42:22 +0530 | [diff] [blame] | 187 | static const struct snd_soc_ops p1022_rdk_ops = { |
Timur Tabi | 96a0af6 | 2012-10-12 14:09:18 -0500 | [diff] [blame] | 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 | */ |
| 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 */ |
Geliang Tang | bb18f09 | 2015-12-23 21:03:39 +0800 | [diff] [blame] | 202 | struct platform_device *ssi_pdev = to_platform_device(dev); |
Timur Tabi | 96a0af6 | 2012-10-12 14:09:18 -0500 | [diff] [blame] | 203 | struct device_node *np = ssi_pdev->dev.of_node; |
| 204 | struct device_node *codec_np = NULL; |
| 205 | struct machine_data *mdata; |
Kuninori Morimoto | 6aa7b40 | 2019-06-06 13:15:25 +0900 | [diff] [blame] | 206 | struct snd_soc_dai_link_component *comp; |
Timur Tabi | 96a0af6 | 2012-10-12 14:09:18 -0500 | [diff] [blame] | 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 | |
Kuninori Morimoto | 6aa7b40 | 2019-06-06 13:15:25 +0900 | [diff] [blame] | 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); |
Timur Tabi | 96a0af6 | 2012-10-12 14:09:18 -0500 | [diff] [blame] | 246 | mdata->dai[0].ops = &p1022_rdk_ops; |
| 247 | |
| 248 | /* ASoC core can match codec with device node */ |
Kuninori Morimoto | 6aa7b40 | 2019-06-06 13:15:25 +0900 | [diff] [blame] | 249 | mdata->dai[0].codecs->of_node = codec_np; |
Timur Tabi | 96a0af6 | 2012-10-12 14:09:18 -0500 | [diff] [blame] | 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) */ |
Kuninori Morimoto | 6aa7b40 | 2019-06-06 13:15:25 +0900 | [diff] [blame] | 259 | mdata->dai[0].codecs->dai_name = "wm8960-hifi"; |
| 260 | mdata->dai[1].codecs->dai_name = mdata->dai[0].codecs->dai_name; |
Timur Tabi | 96a0af6 | 2012-10-12 14:09:18 -0500 | [diff] [blame] | 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_CBM_CFM; |
| 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. */ |
Kuninori Morimoto | 6aa7b40 | 2019-06-06 13:15:25 +0900 | [diff] [blame] | 292 | mdata->dai[0].platforms->name = mdata->platform_name[0]; |
Timur Tabi | 96a0af6 | 2012-10-12 14:09:18 -0500 | [diff] [blame] | 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. */ |
Kuninori Morimoto | 6aa7b40 | 2019-06-06 13:15:25 +0900 | [diff] [blame] | 303 | mdata->dai[1].platforms->name = mdata->platform_name[1]; |
Timur Tabi | 96a0af6 | 2012-10-12 14:09:18 -0500 | [diff] [blame] | 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 | */ |
Bill Pemberton | a0a3d51 | 2012-12-07 09:26:16 -0500 | [diff] [blame] | 348 | static int p1022_rdk_remove(struct platform_device *pdev) |
Timur Tabi | 96a0af6 | 2012-10-12 14:09:18 -0500 | [diff] [blame] | 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 | return 0; |
| 358 | } |
| 359 | |
| 360 | static struct platform_driver p1022_rdk_driver = { |
| 361 | .probe = p1022_rdk_probe, |
Bill Pemberton | a0a3d51 | 2012-12-07 09:26:16 -0500 | [diff] [blame] | 362 | .remove = p1022_rdk_remove, |
Timur Tabi | 96a0af6 | 2012-10-12 14:09:18 -0500 | [diff] [blame] | 363 | .driver = { |
| 364 | /* |
| 365 | * The name must match 'compatible' property in the device tree, |
| 366 | * in lowercase letters. |
| 367 | */ |
| 368 | .name = "snd-soc-p1022rdk", |
Timur Tabi | 96a0af6 | 2012-10-12 14:09:18 -0500 | [diff] [blame] | 369 | }, |
| 370 | }; |
| 371 | |
| 372 | /** |
| 373 | * p1022_rdk_init: machine driver initialization. |
| 374 | * |
| 375 | * This function is called when this module is loaded. |
| 376 | */ |
| 377 | static int __init p1022_rdk_init(void) |
| 378 | { |
| 379 | struct device_node *guts_np; |
| 380 | struct resource res; |
| 381 | |
| 382 | /* Get the physical address of the global utilities registers */ |
| 383 | guts_np = of_find_compatible_node(NULL, NULL, "fsl,p1022-guts"); |
| 384 | if (of_address_to_resource(guts_np, 0, &res)) { |
| 385 | pr_err("snd-soc-p1022rdk: missing/invalid global utils node\n"); |
| 386 | of_node_put(guts_np); |
| 387 | return -EINVAL; |
| 388 | } |
| 389 | guts_phys = res.start; |
| 390 | of_node_put(guts_np); |
| 391 | |
| 392 | return platform_driver_register(&p1022_rdk_driver); |
| 393 | } |
| 394 | |
| 395 | /** |
| 396 | * p1022_rdk_exit: machine driver exit |
| 397 | * |
| 398 | * This function is called when this driver is unloaded. |
| 399 | */ |
| 400 | static void __exit p1022_rdk_exit(void) |
| 401 | { |
| 402 | platform_driver_unregister(&p1022_rdk_driver); |
| 403 | } |
| 404 | |
| 405 | late_initcall(p1022_rdk_init); |
| 406 | module_exit(p1022_rdk_exit); |
| 407 | |
| 408 | MODULE_AUTHOR("Timur Tabi <timur@freescale.com>"); |
| 409 | MODULE_DESCRIPTION("Freescale / iVeia P1022 RDK ALSA SoC machine driver"); |
| 410 | MODULE_LICENSE("GPL v2"); |