/* * ALSA SoC SPDIF In Audio Layer for spear processors * * Copyright (C) 2012 ST Microelectronics * Vipin Kumar <vipin.kumar@st.com> * * This file is licensed under the terms of the GNU General Public * License version 2. This program is licensed "as is" without any * warranty of any kind, whether express or implied. */ #include <linux/clk.h> #include <linux/delay.h> #include <linux/device.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/io.h> #include <linux/ioport.h> #include <linux/module.h> #include <linux/platform_device.h> #include <sound/dmaengine_pcm.h> #include <sound/pcm.h> #include <sound/pcm_params.h> #include <sound/soc.h> #include <sound/spear_dma.h> #include <sound/spear_spdif.h> #include "spdif_in_regs.h" #include "spear_pcm.h" struct spdif_in_params { u32 format; }; struct spdif_in_dev { struct clk *clk; struct spear_dma_data dma_params; struct spdif_in_params saved_params; void *io_base; struct device *dev; void (*reset_perip)(void); int irq; struct snd_dmaengine_dai_dma_data dma_params_rx; struct snd_dmaengine_pcm_config config; }; static void spdif_in_configure(struct spdif_in_dev *host) { u32 ctrl = SPDIF_IN_PRTYEN | SPDIF_IN_STATEN | SPDIF_IN_USREN | SPDIF_IN_VALEN | SPDIF_IN_BLKEN; ctrl |= SPDIF_MODE_16BIT | SPDIF_FIFO_THRES_16; writel(ctrl, host->io_base + SPDIF_IN_CTRL); writel(0xF, host->io_base + SPDIF_IN_IRQ_MASK); } static int spdif_in_dai_probe(struct snd_soc_dai *dai) { struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai); host->dma_params_rx.filter_data = &host->dma_params; dai->capture_dma_data = &host->dma_params_rx; return 0; } static void spdif_in_shutdown(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai); if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) return; writel(0x0, host->io_base + SPDIF_IN_IRQ_MASK); } static void spdif_in_format(struct spdif_in_dev *host, u32 format) { u32 ctrl = readl(host->io_base + SPDIF_IN_CTRL); switch (format) { case SNDRV_PCM_FORMAT_S16_LE: ctrl |= SPDIF_XTRACT_16BIT; break; case SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE: ctrl &= ~SPDIF_XTRACT_16BIT; break; } writel(ctrl, host->io_base + SPDIF_IN_CTRL); } static int spdif_in_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params, struct snd_soc_dai *dai) { struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai); u32 format; if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) return -EINVAL; format = params_format(params); host->saved_params.format = format; return 0; } static int spdif_in_trigger(struct snd_pcm_substream *substream, int cmd, struct snd_soc_dai *dai) { struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai); u32 ctrl; int ret = 0; if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) return -EINVAL; switch (cmd) { case SNDRV_PCM_TRIGGER_START: case SNDRV_PCM_TRIGGER_RESUME: case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: clk_enable(host->clk); spdif_in_configure(host); spdif_in_format(host, host->saved_params.format); ctrl = readl(host->io_base + SPDIF_IN_CTRL); ctrl |= SPDIF_IN_SAMPLE | SPDIF_IN_ENB; writel(ctrl, host->io_base + SPDIF_IN_CTRL); writel(0xF, host->io_base + SPDIF_IN_IRQ_MASK); break; case SNDRV_PCM_TRIGGER_STOP: case SNDRV_PCM_TRIGGER_SUSPEND: case SNDRV_PCM_TRIGGER_PAUSE_PUSH: ctrl = readl(host->io_base + SPDIF_IN_CTRL); ctrl &= ~(SPDIF_IN_SAMPLE | SPDIF_IN_ENB); writel(ctrl, host->io_base + SPDIF_IN_CTRL); writel(0x0, host->io_base + SPDIF_IN_IRQ_MASK); if (host->reset_perip) host->reset_perip(); clk_disable(host->clk); break; default: ret = -EINVAL; break; } return ret; } static struct snd_soc_dai_ops spdif_in_dai_ops = { .shutdown = spdif_in_shutdown, .trigger = spdif_in_trigger, .hw_params = spdif_in_hw_params, }; static struct snd_soc_dai_driver spdif_in_dai = { .probe = spdif_in_dai_probe, .capture = { .channels_min = 2, .channels_max = 2, .rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \ SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000 | \ SNDRV_PCM_RATE_192000), .formats = SNDRV_PCM_FMTBIT_S16_LE | \ SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE, }, .ops = &spdif_in_dai_ops, }; static const struct snd_soc_component_driver spdif_in_component = { .name = "spdif-in", }; static irqreturn_t spdif_in_irq(int irq, void *arg) { struct spdif_in_dev *host = (struct spdif_in_dev *)arg; u32 irq_status = readl(host->io_base + SPDIF_IN_IRQ); if (!irq_status) return IRQ_NONE; if (irq_status & SPDIF_IRQ_FIFOWRITE) dev_err(host->dev, "spdif in: fifo write error"); if (irq_status & SPDIF_IRQ_EMPTYFIFOREAD) dev_err(host->dev, "spdif in: empty fifo read error"); if (irq_status & SPDIF_IRQ_FIFOFULL) dev_err(host->dev, "spdif in: fifo full error"); if (irq_status & SPDIF_IRQ_OUTOFRANGE) dev_err(host->dev, "spdif in: out of range error"); writel(0, host->io_base + SPDIF_IN_IRQ); return IRQ_HANDLED; } static int spdif_in_probe(struct platform_device *pdev) { struct spdif_in_dev *host; struct spear_spdif_platform_data *pdata; struct resource *res, *res_fifo; int ret; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) return -EINVAL; res_fifo = platform_get_resource(pdev, IORESOURCE_IO, 0); if (!res_fifo) return -EINVAL; if (!devm_request_mem_region(&pdev->dev, res->start, resource_size(res), pdev->name)) { dev_warn(&pdev->dev, "Failed to get memory resourse\n"); return -ENOENT; } host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL); if (!host) { dev_warn(&pdev->dev, "kzalloc fail\n"); return -ENOMEM; } host->io_base = devm_ioremap(&pdev->dev, res->start, resource_size(res)); if (!host->io_base) { dev_warn(&pdev->dev, "ioremap failed\n"); return -ENOMEM; } host->irq = platform_get_irq(pdev, 0); if (host->irq < 0) return -EINVAL; host->clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(host->clk)) return PTR_ERR(host->clk); pdata = dev_get_platdata(&pdev->dev); if (!pdata) return -EINVAL; host->dma_params.data = pdata->dma_params; host->dma_params.addr = res_fifo->start; host->dma_params.max_burst = 16; host->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; host->reset_perip = pdata->reset_perip; host->dev = &pdev->dev; dev_set_drvdata(&pdev->dev, host); ret = devm_request_irq(&pdev->dev, host->irq, spdif_in_irq, 0, "spdif-in", host); if (ret) { dev_warn(&pdev->dev, "request_irq failed\n"); return ret; } ret = devm_snd_soc_register_component(&pdev->dev, &spdif_in_component, &spdif_in_dai, 1); if (ret) return ret; return devm_spear_pcm_platform_register(&pdev->dev, &host->config, pdata->filter); } static struct platform_driver spdif_in_driver = { .probe = spdif_in_probe, .driver = { .name = "spdif-in", .owner = THIS_MODULE, }, }; module_platform_driver(spdif_in_driver); MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>"); MODULE_DESCRIPTION("SPEAr SPDIF IN SoC Interface"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:spdif_in");