1 /* 2 * ALSA SoC SPDIF In Audio Layer for spear processors 3 * 4 * Copyright (C) 2012 ST Microelectronics 5 * Vipin Kumar <vipin.kumar@st.com> 6 * 7 * This file is licensed under the terms of the GNU General Public 8 * License version 2. This program is licensed "as is" without any 9 * warranty of any kind, whether express or implied. 10 */ 11 12 #include <linux/clk.h> 13 #include <linux/delay.h> 14 #include <linux/device.h> 15 #include <linux/kernel.h> 16 #include <linux/init.h> 17 #include <linux/io.h> 18 #include <linux/ioport.h> 19 #include <linux/module.h> 20 #include <linux/platform_device.h> 21 #include <sound/pcm.h> 22 #include <sound/pcm_params.h> 23 #include <sound/soc.h> 24 #include <sound/spear_dma.h> 25 #include <sound/spear_spdif.h> 26 #include "spdif_in_regs.h" 27 28 struct spdif_in_params { 29 u32 format; 30 }; 31 32 struct spdif_in_dev { 33 struct clk *clk; 34 struct spear_dma_data dma_params; 35 struct spdif_in_params saved_params; 36 void *io_base; 37 struct device *dev; 38 void (*reset_perip)(void); 39 int irq; 40 }; 41 42 static void spdif_in_configure(struct spdif_in_dev *host) 43 { 44 u32 ctrl = SPDIF_IN_PRTYEN | SPDIF_IN_STATEN | SPDIF_IN_USREN | 45 SPDIF_IN_VALEN | SPDIF_IN_BLKEN; 46 ctrl |= SPDIF_MODE_16BIT | SPDIF_FIFO_THRES_16; 47 48 writel(ctrl, host->io_base + SPDIF_IN_CTRL); 49 writel(0xF, host->io_base + SPDIF_IN_IRQ_MASK); 50 } 51 52 static int spdif_in_startup(struct snd_pcm_substream *substream, 53 struct snd_soc_dai *cpu_dai) 54 { 55 struct spdif_in_dev *host = snd_soc_dai_get_drvdata(cpu_dai); 56 57 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) 58 return -EINVAL; 59 60 snd_soc_dai_set_dma_data(cpu_dai, substream, (void *)&host->dma_params); 61 return 0; 62 } 63 64 static void spdif_in_shutdown(struct snd_pcm_substream *substream, 65 struct snd_soc_dai *dai) 66 { 67 struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai); 68 69 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) 70 return; 71 72 writel(0x0, host->io_base + SPDIF_IN_IRQ_MASK); 73 snd_soc_dai_set_dma_data(dai, substream, NULL); 74 } 75 76 static void spdif_in_format(struct spdif_in_dev *host, u32 format) 77 { 78 u32 ctrl = readl(host->io_base + SPDIF_IN_CTRL); 79 80 switch (format) { 81 case SNDRV_PCM_FORMAT_S16_LE: 82 ctrl |= SPDIF_XTRACT_16BIT; 83 break; 84 85 case SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE: 86 ctrl &= ~SPDIF_XTRACT_16BIT; 87 break; 88 } 89 90 writel(ctrl, host->io_base + SPDIF_IN_CTRL); 91 } 92 93 static int spdif_in_hw_params(struct snd_pcm_substream *substream, 94 struct snd_pcm_hw_params *params, 95 struct snd_soc_dai *dai) 96 { 97 struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai); 98 u32 format; 99 100 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) 101 return -EINVAL; 102 103 format = params_format(params); 104 host->saved_params.format = format; 105 106 return 0; 107 } 108 109 static int spdif_in_trigger(struct snd_pcm_substream *substream, int cmd, 110 struct snd_soc_dai *dai) 111 { 112 struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai); 113 u32 ctrl; 114 int ret = 0; 115 116 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) 117 return -EINVAL; 118 119 switch (cmd) { 120 case SNDRV_PCM_TRIGGER_START: 121 case SNDRV_PCM_TRIGGER_RESUME: 122 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 123 clk_enable(host->clk); 124 spdif_in_configure(host); 125 spdif_in_format(host, host->saved_params.format); 126 127 ctrl = readl(host->io_base + SPDIF_IN_CTRL); 128 ctrl |= SPDIF_IN_SAMPLE | SPDIF_IN_ENB; 129 writel(ctrl, host->io_base + SPDIF_IN_CTRL); 130 writel(0xF, host->io_base + SPDIF_IN_IRQ_MASK); 131 break; 132 133 case SNDRV_PCM_TRIGGER_STOP: 134 case SNDRV_PCM_TRIGGER_SUSPEND: 135 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 136 ctrl = readl(host->io_base + SPDIF_IN_CTRL); 137 ctrl &= ~(SPDIF_IN_SAMPLE | SPDIF_IN_ENB); 138 writel(ctrl, host->io_base + SPDIF_IN_CTRL); 139 writel(0x0, host->io_base + SPDIF_IN_IRQ_MASK); 140 141 if (host->reset_perip) 142 host->reset_perip(); 143 clk_disable(host->clk); 144 break; 145 146 default: 147 ret = -EINVAL; 148 break; 149 } 150 return ret; 151 } 152 153 static struct snd_soc_dai_ops spdif_in_dai_ops = { 154 .startup = spdif_in_startup, 155 .shutdown = spdif_in_shutdown, 156 .trigger = spdif_in_trigger, 157 .hw_params = spdif_in_hw_params, 158 }; 159 160 struct snd_soc_dai_driver spdif_in_dai = { 161 .capture = { 162 .channels_min = 2, 163 .channels_max = 2, 164 .rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \ 165 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000 | \ 166 SNDRV_PCM_RATE_192000), 167 .formats = SNDRV_PCM_FMTBIT_S16_LE | \ 168 SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE, 169 }, 170 .ops = &spdif_in_dai_ops, 171 }; 172 173 static irqreturn_t spdif_in_irq(int irq, void *arg) 174 { 175 struct spdif_in_dev *host = (struct spdif_in_dev *)arg; 176 177 u32 irq_status = readl(host->io_base + SPDIF_IN_IRQ); 178 179 if (!irq_status) 180 return IRQ_NONE; 181 182 if (irq_status & SPDIF_IRQ_FIFOWRITE) 183 dev_err(host->dev, "spdif in: fifo write error"); 184 if (irq_status & SPDIF_IRQ_EMPTYFIFOREAD) 185 dev_err(host->dev, "spdif in: empty fifo read error"); 186 if (irq_status & SPDIF_IRQ_FIFOFULL) 187 dev_err(host->dev, "spdif in: fifo full error"); 188 if (irq_status & SPDIF_IRQ_OUTOFRANGE) 189 dev_err(host->dev, "spdif in: out of range error"); 190 191 writel(0, host->io_base + SPDIF_IN_IRQ); 192 193 return IRQ_HANDLED; 194 } 195 196 static int spdif_in_probe(struct platform_device *pdev) 197 { 198 struct spdif_in_dev *host; 199 struct spear_spdif_platform_data *pdata; 200 struct resource *res, *res_fifo; 201 int ret; 202 203 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 204 if (!res) 205 return -EINVAL; 206 207 res_fifo = platform_get_resource(pdev, IORESOURCE_IO, 0); 208 if (!res_fifo) 209 return -EINVAL; 210 211 if (!devm_request_mem_region(&pdev->dev, res->start, 212 resource_size(res), pdev->name)) { 213 dev_warn(&pdev->dev, "Failed to get memory resourse\n"); 214 return -ENOENT; 215 } 216 217 host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL); 218 if (!host) { 219 dev_warn(&pdev->dev, "kzalloc fail\n"); 220 return -ENOMEM; 221 } 222 223 host->io_base = devm_ioremap(&pdev->dev, res->start, 224 resource_size(res)); 225 if (!host->io_base) { 226 dev_warn(&pdev->dev, "ioremap failed\n"); 227 return -ENOMEM; 228 } 229 230 host->irq = platform_get_irq(pdev, 0); 231 if (host->irq < 0) 232 return -EINVAL; 233 234 host->clk = clk_get(&pdev->dev, NULL); 235 if (IS_ERR(host->clk)) 236 return PTR_ERR(host->clk); 237 238 pdata = dev_get_platdata(&pdev->dev); 239 240 if (!pdata) 241 return -EINVAL; 242 243 host->dma_params.data = pdata->dma_params; 244 host->dma_params.addr = res_fifo->start; 245 host->dma_params.max_burst = 16; 246 host->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; 247 host->dma_params.filter = pdata->filter; 248 host->reset_perip = pdata->reset_perip; 249 250 host->dev = &pdev->dev; 251 dev_set_drvdata(&pdev->dev, host); 252 253 ret = devm_request_irq(&pdev->dev, host->irq, spdif_in_irq, 0, 254 "spdif-in", host); 255 if (ret) { 256 clk_put(host->clk); 257 dev_warn(&pdev->dev, "request_irq failed\n"); 258 return ret; 259 } 260 261 ret = snd_soc_register_dai(&pdev->dev, &spdif_in_dai); 262 if (ret != 0) { 263 clk_put(host->clk); 264 return ret; 265 } 266 267 return 0; 268 } 269 270 static int spdif_in_remove(struct platform_device *pdev) 271 { 272 struct spdif_in_dev *host = dev_get_drvdata(&pdev->dev); 273 274 snd_soc_unregister_dai(&pdev->dev); 275 dev_set_drvdata(&pdev->dev, NULL); 276 277 clk_put(host->clk); 278 279 return 0; 280 } 281 282 283 static struct platform_driver spdif_in_driver = { 284 .probe = spdif_in_probe, 285 .remove = spdif_in_remove, 286 .driver = { 287 .name = "spdif-in", 288 .owner = THIS_MODULE, 289 }, 290 }; 291 292 module_platform_driver(spdif_in_driver); 293 294 MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>"); 295 MODULE_DESCRIPTION("SPEAr SPDIF IN SoC Interface"); 296 MODULE_LICENSE("GPL"); 297 MODULE_ALIAS("platform:spdif_in"); 298