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ASoC: loongson: Add I2S controller driver as platform device
The Loongson I2S controller exists not only in PCI form (LS7A bridge chip), but also in platform device form (Loongson-2K1000 SoC). This patch adds support for platform device I2S controller. Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn> Link: https://patch.msgid.link/36c143358c7f48bc2e73c30e1d2009b2f2fc6498.1728459624.git.zhoubinbin@loongson.cn Signed-off-by: Mark Brown <broonie@kernel.org>
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‎sound/soc/loongson/Kconfig‎

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@@ -1,27 +1,38 @@
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# SPDX-License-Identifier: GPL-2.0
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menu "SoC Audio for Loongson CPUs"
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config SND_SOC_LOONGSON_CARD
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tristate "Loongson Sound Card Driver"
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depends on LOONGARCH || COMPILE_TEST
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select SND_SOC_LOONGSON_I2S_PCI if PCI
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select SND_SOC_LOONGSON_I2S_PLATFORM if OF
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help
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Say Y or M if you want to add support for SoC audio using
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loongson I2S controller.
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The driver add support for ALSA SoC Audio support using
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loongson I2S controller.
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config SND_SOC_LOONGSON_I2S_PCI
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tristate "Loongson I2S-PCI Device Driver"
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depends on LOONGARCH || COMPILE_TEST
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select REGMAP_MMIO
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depends on PCI
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help
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Say Y or M if you want to add support for I2S driver for
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Loongson I2S controller.
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The controller is found in loongson bridge chips or SoCs,
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and work as a PCI device.
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config SND_SOC_LOONGSON_CARD
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tristate "Loongson Sound Card Driver"
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select SND_SOC_LOONGSON_I2S_PCI
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depends on PCI
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config SND_SOC_LOONGSON_I2S_PLATFORM
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tristate "Loongson I2S-PLAT Device Driver"
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depends on LOONGARCH || COMPILE_TEST
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select REGMAP_MMIO
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select SND_SOC_GENERIC_DMAENGINE_PCM
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help
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Say Y or M if you want to add support for SoC audio using
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loongson I2S controller.
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The driver add support for ALSA SoC Audio support using
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loongson I2S controller.
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Say Y or M if you want to add support for I2S driver for
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Loongson I2S controller.
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The controller work as a platform device, we can found it in
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Loongson-2K1000 SoCs.
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endmenu

‎sound/soc/loongson/Makefile‎

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@@ -3,6 +3,9 @@
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snd-soc-loongson-i2s-pci-y := loongson_i2s_pci.o loongson_i2s.o loongson_dma.o
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obj-$(CONFIG_SND_SOC_LOONGSON_I2S_PCI) += snd-soc-loongson-i2s-pci.o
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snd-soc-loongson-i2s-plat-y := loongson_i2s_plat.o loongson_i2s.o
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obj-$(CONFIG_SND_SOC_LOONGSON_I2S_PLATFORM) += snd-soc-loongson-i2s-plat.o
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#Machine Support
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snd-soc-loongson-card-y := loongson_card.o
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obj-$(CONFIG_SND_SOC_LOONGSON_CARD) += snd-soc-loongson-card.o

‎sound/soc/loongson/loongson_i2s_plat.c‎

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// SPDX-License-Identifier: GPL-2.0
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//
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// Loongson I2S controller master mode dirver(platform device)
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//
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// Copyright (C) 2023-2024 Loongson Technology Corporation Limited
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//
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// Author: Yingkun Meng <mengyingkun@loongson.cn>
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// Binbin Zhou <zhoubinbin@loongson.cn>
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#include <linux/clk.h>
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#include <linux/dma-mapping.h>
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#include <linux/module.h>
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#include <linux/of_dma.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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#include <sound/dmaengine_pcm.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/soc.h>
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#include "loongson_i2s.h"
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#define LOONGSON_I2S_RX_DMA_OFFSET 21
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#define LOONGSON_I2S_TX_DMA_OFFSET 18
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#define LOONGSON_DMA0_CONF 0x0
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#define LOONGSON_DMA1_CONF 0x1
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#define LOONGSON_DMA2_CONF 0x2
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#define LOONGSON_DMA3_CONF 0x3
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#define LOONGSON_DMA4_CONF 0x4
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/* periods_max = PAGE_SIZE / sizeof(struct ls_dma_chan_reg) */
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static const struct snd_pcm_hardware loongson_pcm_hardware = {
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.info = SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_MMAP_VALID |
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SNDRV_PCM_INFO_RESUME |
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SNDRV_PCM_INFO_PAUSE,
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.formats = SNDRV_PCM_FMTBIT_S16_LE |
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SNDRV_PCM_FMTBIT_S20_3LE |
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SNDRV_PCM_FMTBIT_S24_LE,
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.period_bytes_min = 128,
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.period_bytes_max = 128 * 1024,
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.periods_min = 1,
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.periods_max = 64,
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.buffer_bytes_max = 1024 * 1024,
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};
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static const struct snd_dmaengine_pcm_config loongson_dmaengine_pcm_config = {
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.pcm_hardware = &loongson_pcm_hardware,
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.prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
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.prealloc_buffer_size = 128 * 1024,
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};
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static int loongson_pcm_open(struct snd_soc_component *component,
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struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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if (substream->pcm->device & 1) {
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runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
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runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
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}
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if (substream->pcm->device & 2)
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runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_MMAP_VALID);
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/*
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* For mysterious reasons (and despite what the manual says)
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* playback samples are lost if the DMA count is not a multiple
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* of the DMA burst size. Let's add a rule to enforce that.
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*/
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snd_pcm_hw_constraint_step(runtime, 0,
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SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 128);
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snd_pcm_hw_constraint_step(runtime, 0,
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SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 128);
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snd_pcm_hw_constraint_integer(substream->runtime,
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SNDRV_PCM_HW_PARAM_PERIODS);
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return 0;
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}
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static const struct snd_soc_component_driver loongson_i2s_component_driver = {
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.name = LS_I2S_DRVNAME,
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.open = loongson_pcm_open,
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};
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static const struct regmap_config loongson_i2s_regmap_config = {
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.reg_bits = 32,
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.reg_stride = 4,
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.val_bits = 32,
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.max_register = 0x14,
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.cache_type = REGCACHE_FLAT,
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};
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static int loongson_i2s_apbdma_config(struct platform_device *pdev)
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{
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int val;
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void __iomem *regs;
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regs = devm_platform_ioremap_resource(pdev, 1);
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if (IS_ERR(regs))
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return PTR_ERR(regs);
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val = readl(regs);
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val |= LOONGSON_DMA2_CONF << LOONGSON_I2S_TX_DMA_OFFSET;
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val |= LOONGSON_DMA3_CONF << LOONGSON_I2S_RX_DMA_OFFSET;
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writel(val, regs);
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return 0;
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}
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static int loongson_i2s_plat_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct loongson_i2s *i2s;
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struct resource *res;
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struct clk *i2s_clk;
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int ret;
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i2s = devm_kzalloc(dev, sizeof(*i2s), GFP_KERNEL);
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if (!i2s)
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return -ENOMEM;
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ret = loongson_i2s_apbdma_config(pdev);
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if (ret)
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return ret;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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i2s->reg_base = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(i2s->reg_base))
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return dev_err_probe(dev, PTR_ERR(i2s->reg_base),
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"devm_ioremap_resource failed\n");
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i2s->regmap = devm_regmap_init_mmio(dev, i2s->reg_base,
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&loongson_i2s_regmap_config);
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if (IS_ERR(i2s->regmap))
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return dev_err_probe(dev, PTR_ERR(i2s->regmap),
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"devm_regmap_init_mmio failed\n");
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i2s->playback_dma_data.addr = res->start + LS_I2S_TX_DATA;
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i2s->playback_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
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i2s->playback_dma_data.maxburst = 4;
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i2s->capture_dma_data.addr = res->start + LS_I2S_RX_DATA;
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i2s->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
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i2s->capture_dma_data.maxburst = 4;
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i2s_clk = devm_clk_get_enabled(dev, NULL);
150+
if (IS_ERR(i2s_clk))
151+
return dev_err_probe(dev, PTR_ERR(i2s_clk), "clock property invalid\n");
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i2s->clk_rate = clk_get_rate(i2s_clk);
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dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
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dev_set_name(dev, LS_I2S_DRVNAME);
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dev_set_drvdata(dev, i2s);
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ret = devm_snd_soc_register_component(dev, &loongson_i2s_component_driver,
159+
&loongson_i2s_dai, 1);
160+
if (ret)
161+
return dev_err_probe(dev, ret, "failed to register DAI\n");
162+
163+
return devm_snd_dmaengine_pcm_register(dev, &loongson_dmaengine_pcm_config,
164+
SND_DMAENGINE_PCM_FLAG_COMPAT);
165+
}
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167+
static const struct of_device_id loongson_i2s_ids[] = {
168+
{ .compatible = "loongson,ls2k1000-i2s" },
169+
{ /* sentinel */ },
170+
};
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MODULE_DEVICE_TABLE(of, loongson_i2s_ids);
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static struct platform_driver loongson_i2s_driver = {
174+
.probe = loongson_i2s_plat_probe,
175+
.driver = {
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.name = "loongson-i2s-plat",
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.pm = pm_sleep_ptr(&loongson_i2s_pm),
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.of_match_table = loongson_i2s_ids,
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},
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};
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module_platform_driver(loongson_i2s_driver);
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MODULE_DESCRIPTION("Loongson I2S Master Mode ASoC Driver");
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MODULE_AUTHOR("Loongson Technology Corporation Limited");
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MODULE_LICENSE("GPL");

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