/* * 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 #define AXI_I2S_REG_RESET 0x00 #define AXI_I2S_REG_CTRL 0x04 #define AXI_I2S_REG_CLK_CTRL 0x08 #define AXI_I2S_REG_STATUS 0x10 #define AXI_I2S_REG_RX_FIFO 0x28 #define AXI_I2S_REG_TX_FIFO 0x2C #define AXI_I2S_RESET_GLOBAL BIT(0) #define AXI_I2S_RESET_TX_FIFO BIT(1) #define AXI_I2S_RESET_RX_FIFO BIT(2) #define AXI_I2S_CTRL_TX_EN BIT(0) #define AXI_I2S_CTRL_RX_EN BIT(1) /* The frame size is configurable, but for now we always set it 64 bit */ #define AXI_I2S_BITS_PER_FRAME 64 struct axi_i2s { struct regmap *regmap; struct clk *clk; struct clk *clk_ref; struct snd_soc_dai_driver dai_driver; struct snd_dmaengine_dai_dma_data capture_dma_data; struct snd_dmaengine_dai_dma_data playback_dma_data; struct snd_ratnum ratnum; struct snd_pcm_hw_constraint_ratnums rate_constraints; }; static int axi_i2s_trigger(struct snd_pcm_substream *substream, int cmd, struct snd_soc_dai *dai) { struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai); unsigned int mask, val; if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) mask = AXI_I2S_CTRL_RX_EN; else mask = AXI_I2S_CTRL_TX_EN; switch (cmd) { case SNDRV_PCM_TRIGGER_START: case SNDRV_PCM_TRIGGER_RESUME: case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: val = mask; 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(i2s->regmap, AXI_I2S_REG_CTRL, mask, val); return 0; } static int axi_i2s_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params, struct snd_soc_dai *dai) { struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai); unsigned int bclk_div, word_size; unsigned int bclk_rate; bclk_rate = params_rate(params) * AXI_I2S_BITS_PER_FRAME; word_size = AXI_I2S_BITS_PER_FRAME / 2 - 1; bclk_div = DIV_ROUND_UP(clk_get_rate(i2s->clk_ref), bclk_rate) / 2 - 1; regmap_write(i2s->regmap, AXI_I2S_REG_CLK_CTRL, (word_size << 16) | bclk_div); return 0; } static int axi_i2s_startup(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai); uint32_t mask; int ret; if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) mask = AXI_I2S_RESET_RX_FIFO; else mask = AXI_I2S_RESET_TX_FIFO; regmap_write(i2s->regmap, AXI_I2S_REG_RESET, mask); ret = snd_pcm_hw_constraint_ratnums(substream->runtime, 0, SNDRV_PCM_HW_PARAM_RATE, &i2s->rate_constraints); if (ret) return ret; return clk_prepare_enable(i2s->clk_ref); } static void axi_i2s_shutdown(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai); clk_disable_unprepare(i2s->clk_ref); } static int axi_i2s_dai_probe(struct snd_soc_dai *dai) { struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai); snd_soc_dai_init_dma_data(dai, &i2s->playback_dma_data, &i2s->capture_dma_data); return 0; } static const struct snd_soc_dai_ops axi_i2s_dai_ops = { .startup = axi_i2s_startup, .shutdown = axi_i2s_shutdown, .trigger = axi_i2s_trigger, .hw_params = axi_i2s_hw_params, }; static struct snd_soc_dai_driver axi_i2s_dai = { .probe = axi_i2s_dai_probe, .playback = { .channels_min = 2, .channels_max = 2, .rates = SNDRV_PCM_RATE_KNOT, .formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_U32_LE, }, .capture = { .channels_min = 2, .channels_max = 2, .rates = SNDRV_PCM_RATE_KNOT, .formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_U32_LE, }, .ops = &axi_i2s_dai_ops, .symmetric_rates = 1, }; static const struct snd_soc_component_driver axi_i2s_component = { .name = "axi-i2s", }; static const struct regmap_config axi_i2s_regmap_config = { .reg_bits = 32, .reg_stride = 4, .val_bits = 32, .max_register = AXI_I2S_REG_STATUS, }; static int axi_i2s_probe(struct platform_device *pdev) { struct resource *res; struct axi_i2s *i2s; void __iomem *base; int ret; i2s = devm_kzalloc(&pdev->dev, sizeof(*i2s), GFP_KERNEL); if (!i2s) return -ENOMEM; platform_set_drvdata(pdev, i2s); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); base = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(base)) return PTR_ERR(base); i2s->regmap = devm_regmap_init_mmio(&pdev->dev, base, &axi_i2s_regmap_config); if (IS_ERR(i2s->regmap)) return PTR_ERR(i2s->regmap); i2s->clk = devm_clk_get(&pdev->dev, "axi"); if (IS_ERR(i2s->clk)) return PTR_ERR(i2s->clk); i2s->clk_ref = devm_clk_get(&pdev->dev, "ref"); if (IS_ERR(i2s->clk_ref)) return PTR_ERR(i2s->clk_ref); ret = clk_prepare_enable(i2s->clk); if (ret) return ret; i2s->playback_dma_data.addr = res->start + AXI_I2S_REG_TX_FIFO; i2s->playback_dma_data.addr_width = 4; i2s->playback_dma_data.maxburst = 1; i2s->capture_dma_data.addr = res->start + AXI_I2S_REG_RX_FIFO; i2s->capture_dma_data.addr_width = 4; i2s->capture_dma_data.maxburst = 1; i2s->ratnum.num = clk_get_rate(i2s->clk_ref) / 2 / AXI_I2S_BITS_PER_FRAME; i2s->ratnum.den_step = 1; i2s->ratnum.den_min = 1; i2s->ratnum.den_max = 64; i2s->rate_constraints.rats = &i2s->ratnum; i2s->rate_constraints.nrats = 1; regmap_write(i2s->regmap, AXI_I2S_REG_RESET, AXI_I2S_RESET_GLOBAL); ret = devm_snd_soc_register_component(&pdev->dev, &axi_i2s_component, &axi_i2s_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(i2s->clk); return ret; } static int axi_i2s_dev_remove(struct platform_device *pdev) { struct axi_i2s *i2s = platform_get_drvdata(pdev); clk_disable_unprepare(i2s->clk); return 0; } static const struct of_device_id axi_i2s_of_match[] = { { .compatible = "adi,axi-i2s-1.00.a", }, {}, }; MODULE_DEVICE_TABLE(of, axi_i2s_of_match); static struct platform_driver axi_i2s_driver = { .driver = { .name = "axi-i2s", .of_match_table = axi_i2s_of_match, }, .probe = axi_i2s_probe, .remove = axi_i2s_dev_remove, }; module_platform_driver(axi_i2s_driver); MODULE_AUTHOR("Lars-Peter Clausen "); MODULE_DESCRIPTION("AXI I2S driver"); MODULE_LICENSE("GPL"); mp;id2=bf29bddf0417a4783da3b24e8c9e017ac649326f'>diff)
efi/fdt: Avoid FDT manipulation after ExitBootServices()
Some AArch64 UEFI implementations disable the MMU in ExitBootServices(), after which unaligned accesses to RAM are no longer supported. Commit: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") fixed an issue in the memory map handling of the stub FDT code, but inadvertently created an issue with such firmware, by moving some of the FDT manipulation to after the invocation of ExitBootServices(). Given that the stub's libfdt implementation uses the ordinary, accelerated string functions, which rely on hardware handling of unaligned accesses, manipulating the FDT with the MMU off may result in alignment faults. So fix the situation by moving the update_fdt_memmap() call into the callback function invoked by efi_exit_boot_services() right before it calls the ExitBootServices() UEFI service (which is arguably a better place for it anyway) Note that disabling the MMU in ExitBootServices() is not compliant with the UEFI spec, and carries great risk due to the fact that switching from cached to uncached memory accesses halfway through compiler generated code (i.e., involving a stack) can never be done in a way that is architecturally safe. Fixes: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Riku Voipio <riku.voipio@linaro.org> Cc: <stable@vger.kernel.org> Cc: mark.rutland@arm.com Cc: linux-efi@vger.kernel.org Cc: matt@codeblueprint.co.uk Cc: leif.lindholm@linaro.org Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/1485971102-23330-2-git-send-email-ard.biesheuvel@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'sound/soc/codecs/tlv320aic32x4-i2c.c')