/* * Copyright (C) 2012-2013, Analog Devices Inc. * Author: Lars-Peter Clausen * * Licensed under the GPL-2. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define AXI_SPDIF_REG_CTRL 0x0 #define AXI_SPDIF_REG_STAT 0x4 #define AXI_SPDIF_REG_TX_FIFO 0xc #define AXI_SPDIF_CTRL_TXDATA BIT(1) #define AXI_SPDIF_CTRL_TXEN BIT(0) #define AXI_SPDIF_CTRL_CLKDIV_OFFSET 8 #define AXI_SPDIF_CTRL_CLKDIV_MASK (0xff << 8) #define AXI_SPDIF_FREQ_44100 (0x0 << 6) #define AXI_SPDIF_FREQ_48000 (0x1 << 6) #define AXI_SPDIF_FREQ_32000 (0x2 << 6) #define AXI_SPDIF_FREQ_NA (0x3 << 6) struct axi_spdif { struct regmap *regmap; struct clk *clk; struct clk *clk_ref; struct snd_dmaengine_dai_dma_data dma_data; struct snd_ratnum ratnum; struct snd_pcm_hw_constraint_ratnums rate_constraints; }; static int axi_spdif_trigger(struct snd_pcm_substream *substream, int cmd, struct snd_soc_dai *dai) { struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai); unsigned int val; switch (cmd) { case SNDRV_PCM_TRIGGER_START: case SNDRV_PCM_TRIGGER_RESUME: case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: val = AXI_SPDIF_CTRL_TXDATA; break; case SNDRV_PCM_TRIGGER_STOP: case SNDRV_PCM_TRIGGER_SUSPEND: case SNDRV_PCM_TRIGGER_PAUSE_PUSH: val = 0; break; default: return -EINVAL; } regmap_update_bits(spdif->regmap, AXI_SPDIF_REG_CTRL, AXI_SPDIF_CTRL_TXDATA, val); return 0; } static int axi_spdif_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params, struct snd_soc_dai *dai) { struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai); unsigned int rate = params_rate(params); unsigned int clkdiv, stat; switch (params_rate(params)) { case 32000: stat = AXI_SPDIF_FREQ_32000; break; case 44100: stat = AXI_SPDIF_FREQ_44100; break; case 48000: stat = AXI_SPDIF_FREQ_48000; break; default: stat = AXI_SPDIF_FREQ_NA; break; } clkdiv = DIV_ROUND_CLOSEST(clk_get_rate(spdif->clk_ref), rate * 64 * 2) - 1; clkdiv <<= AXI_SPDIF_CTRL_CLKDIV_OFFSET; regmap_write(spdif->regmap, AXI_SPDIF_REG_STAT, stat); regmap_update_bits(spdif->regmap, AXI_SPDIF_REG_CTRL, AXI_SPDIF_CTRL_CLKDIV_MASK, clkdiv); return 0; } static int axi_spdif_dai_probe(struct snd_soc_dai *dai) { struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai); snd_soc_dai_init_dma_data(dai, &spdif->dma_data, NULL); return 0; } static int axi_spdif_startup(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai); int ret; ret = snd_pcm_hw_constraint_ratnums(substream->runtime, 0, SNDRV_PCM_HW_PARAM_RATE, &spdif->rate_constraints); if (ret) return ret; ret = clk_prepare_enable(spdif->clk_ref); if (ret) return ret; regmap_update_bits(spdif->regmap, AXI_SPDIF_REG_CTRL, AXI_SPDIF_CTRL_TXEN, AXI_SPDIF_CTRL_TXEN); return 0; } static void axi_spdif_shutdown(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai); regmap_update_bits(spdif->regmap, AXI_SPDIF_REG_CTRL, AXI_SPDIF_CTRL_TXEN, 0); clk_disable_unprepare(spdif->clk_ref); } static const struct snd_soc_dai_ops axi_spdif_dai_ops = { .startup = axi_spdif_startup, .shutdown = axi_spdif_shutdown, .trigger = axi_spdif_trigger, .hw_params = axi_spdif_hw_params, }; static struct snd_soc_dai_driver axi_spdif_dai = { .probe = axi_spdif_dai_probe, .playback = { .channels_min = 2, .channels_max = 2, .rates = SNDRV_PCM_RATE_KNOT, .formats = SNDRV_PCM_FMTBIT_S16_LE, }, .ops = &axi_spdif_dai_ops, }; static const struct snd_soc_component_driver axi_spdif_component = { .name = "axi-spdif", }; static const struct regmap_config axi_spdif_regmap_config = { .reg_bits = 32, .reg_stride = 4, .val_bits = 32, .max_register = AXI_SPDIF_REG_STAT, }; static int axi_spdif_probe(struct platform_device *pdev) { struct axi_spdif *spdif; struct resource *res; void __iomem *base; int ret; spdif = devm_kzalloc(&pdev->dev, sizeof(*spdif), GFP_KERNEL); if (!spdif) return -ENOMEM; platform_set_drvdata(pdev, spdif); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); base = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(base)) return PTR_ERR(base); spdif->regmap = devm_regmap_init_mmio(&pdev->dev, base, &axi_spdif_regmap_config); if (IS_ERR(spdif->regmap)) return PTR_ERR(spdif->regmap); spdif->clk = devm_clk_get(&pdev->dev, "axi"); if (IS_ERR(spdif->clk)) return PTR_ERR(spdif->clk); spdif->clk_ref = devm_clk_get(&pdev->dev, "ref"); if (IS_ERR(spdif->clk_ref)) return PTR_ERR(spdif->clk_ref); ret = clk_prepare_enable(spdif->clk); if (ret) return ret; spdif->dma_data.addr = res->start + AXI_SPDIF_REG_TX_FIFO; spdif->dma_data.addr_width = 4; spdif->dma_data.maxburst = 1; spdif->ratnum.num = clk_get_rate(spdif->clk_ref) / 128; spdif->ratnum.den_step = 1; spdif->ratnum.den_min = 1; spdif->ratnum.den_max = 64; spdif->rate_constraints.rats = &spdif->ratnum; spdif->rate_constraints.nrats = 1; ret = devm_snd_soc_register_component(&pdev->dev, &axi_spdif_component, &axi_spdif_dai, 1); if (ret) goto err_clk_disable; ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0); if (ret) goto err_clk_disable; return 0; err_clk_disable: clk_disable_unprepare(spdif->clk); return ret; } static int axi_spdif_dev_remove(struct platform_device *pdev) { struct axi_spdif *spdif = platform_get_drvdata(pdev); clk_disable_unprepare(spdif->clk); return 0; } static const struct of_device_id axi_spdif_of_match[] = { { .compatible = "adi,axi-spdif-tx-1.00.a", }, {}, }; MODULE_DEVICE_TABLE(of, axi_spdif_of_match); static struct platform_driver axi_spdif_driver = { .driver = { .name = "axi-spdif", .of_match_table = axi_spdif_of_match, }, .probe = axi_spdif_probe, .remove = axi_spdif_dev_remove, }; module_platform_driver(axi_spdif_driver); MODULE_AUTHOR("Lars-Peter Clausen "); MODULE_DESCRIPTION("AXI SPDIF driver"); MODULE_LICENSE("GPL"); ge tag 'docs-4.10' of git://git.lwn.net/linuxHEADmaster
Pull documentation update from Jonathan Corbet: "These are the documentation changes for 4.10. It's another busy cycle for the docs tree, as the sphinx conversion continues. Highlights include: - Further work on PDF output, which remains a bit of a pain but should be more solid now. - Five more DocBook template files converted to Sphinx. Only 27 to go... Lots of plain-text files have also been converted and integrated. - Images in binary formats have been replaced with more source-friendly versions. - Various bits of organizational work, including the renaming of various files discussed at the kernel summit. - New documentation for the device_link mechanism. ... and, of course, lots of typo fixes and small updates" * tag 'docs-4.10' of git://git.lwn.net/linux: (193 commits) dma-buf: Extract dma-buf.rst Update Documentation/00-INDEX docs: 00-INDEX: document directories/files with no docs docs: 00-INDEX: remove non-existing entries docs: 00-INDEX: add missing entries for documentation files/dirs docs: 00-INDEX: consolidate process/ and admin-guide/ description scripts: add a script to check if Documentation/00-INDEX is sane Docs: change sh -> awk in REPORTING-BUGS Documentation/core-api/device_link: Add initial documentation core-api: remove an unexpected unident ppc/idle: Add documentation for powersave=off Doc: Correct typo, "Introdution" => "Introduction" Documentation/atomic_ops.txt: convert to ReST markup Documentation/local_ops.txt: convert to ReST markup Documentation/assoc_array.txt: convert to ReST markup docs-rst: parse-headers.pl: cleanup the documentation docs-rst: fix media cleandocs target docs-rst: media/Makefile: reorganize the rules docs-rst: media: build SVG from graphviz files docs-rst: replace bayer.png by a SVG image ...
Diffstat (limited to 'include/sound/ac97_codec.h')