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@xxxxxxxxxxx>
---
sound/soc/loongson/Kconfig | 12 +-
sound/soc/loongson/Makefile | 3 +
sound/soc/loongson/loongson_i2s_plat.c | 186 +++++++++++++++++++++++++
3 files changed, 200 insertions(+), 1 deletion(-)
create mode 100644 sound/soc/loongson/loongson_i2s_plat.c
diff --git a/sound/soc/loongson/Kconfig b/sound/soc/loongson/Kconfig
index b8d7e2bade24..cd298f8b54cd 100644
--- a/sound/soc/loongson/Kconfig
+++ b/sound/soc/loongson/Kconfig
@@ -13,10 +13,20 @@ config SND_SOC_LOONGSON_I2S_PCI
The controller is found in loongson bridge chips or SoCs,
and work as a PCI device.
+config SND_SOC_LOONGSON_I2S_PLATFORM
+ tristate "Loongson I2S controller as platform device"
+ select SND_SOC_GENERIC_DMAENGINE_PCM
+ help
+ Say Y or M if you want to add support for I2S driver for
+ Loongson I2S controller.
+
+ The controller work as a platform device, found in loongson
+ SoCs.
+
config SND_SOC_LOONGSON_CARD
tristate "Loongson Sound Card Driver"
select SND_SOC_LOONGSON_I2S_PCI
- depends on PCI
+ select SND_SOC_LOONGSON_I2S_PLATFORM
help
Say Y or M if you want to add support for SoC audio using
loongson I2S controller.
diff --git a/sound/soc/loongson/Makefile b/sound/soc/loongson/Makefile
index 578030ad6563..f396259244a3 100644
--- a/sound/soc/loongson/Makefile
+++ b/sound/soc/loongson/Makefile
@@ -3,6 +3,9 @@
snd-soc-loongson-i2s-pci-y := loongson_i2s_pci.o loongson_i2s.o loongson_dma.o
obj-$(CONFIG_SND_SOC_LOONGSON_I2S_PCI) += snd-soc-loongson-i2s-pci.o
+snd-soc-loongson-i2s-plat-y := loongson_i2s_plat.o loongson_i2s.o
+obj-$(CONFIG_SND_SOC_LOONGSON_I2S_PLATFORM) += snd-soc-loongson-i2s-plat.o
+
#Machine Support
snd-soc-loongson-card-y := loongson_card.o
obj-$(CONFIG_SND_SOC_LOONGSON_CARD) += snd-soc-loongson-card.o
diff --git a/sound/soc/loongson/loongson_i2s_plat.c b/sound/soc/loongson/loongson_i2s_plat.c
new file mode 100644
index 000000000000..668067753b1c
--- /dev/null
+++ b/sound/soc/loongson/loongson_i2s_plat.c
@@ -0,0 +1,186 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Loongson I2S controller master mode dirver(platform device)
+ *
+ * Copyright (C) 2023-2024 Loongson Technology Corporation Limited
+ *
+ * Author: Yingkun Meng <mengyingkun@xxxxxxxxxxx>
+ * Binbin Zhou <zhoubinbin@xxxxxxxxxxx>
+ */
+
+#include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/module.h>
+#include <linux/of_dma.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <sound/dmaengine_pcm.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+#include "loongson_i2s.h"
+
+#define LOONGSON_I2S_RX_DMA_OFFSET 21
+#define LOONGSON_I2S_TX_DMA_OFFSET 18
+
+#define LOONGSON_DMA0_CONF 0x0
+#define LOONGSON_DMA1_CONF 0x1
+#define LOONGSON_DMA2_CONF 0x2
+#define LOONGSON_DMA3_CONF 0x3
+#define LOONGSON_DMA4_CONF 0x4
+
+/* periods_max = PAGE_SIZE / sizeof(struct ls_dma_chan_reg) */
+static const struct snd_pcm_hardware loongson_pcm_hardware = {
+ .info = SNDRV_PCM_INFO_MMAP |
+ SNDRV_PCM_INFO_INTERLEAVED |
+ SNDRV_PCM_INFO_MMAP_VALID |
+ SNDRV_PCM_INFO_RESUME |
+ SNDRV_PCM_INFO_PAUSE,
+ .formats = SNDRV_PCM_FMTBIT_S16_LE |
+ SNDRV_PCM_FMTBIT_S20_3LE |
+ SNDRV_PCM_FMTBIT_S24_LE,
+ .period_bytes_min = 128,
+ .period_bytes_max = 128 * 1024,
+ .periods_min = 1,
+ .periods_max = 64,
+ .buffer_bytes_max = 1024 * 1024,
+};
+
+static const struct snd_dmaengine_pcm_config loongson_dmaengine_pcm_config = {
+ .pcm_hardware = &loongson_pcm_hardware,
+ .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
+ .prealloc_buffer_size = 128 * 1024,
+};
+
+static int loongson_pcm_open(struct snd_soc_component *component,
+ struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+
+ if (substream->pcm->device & 1) {
+ runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
+ runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
+ }
+
+ if (substream->pcm->device & 2)
+ runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP |
+ SNDRV_PCM_INFO_MMAP_VALID);
+ /*
+ * For mysterious reasons (and despite what the manual says)
+ * playback samples are lost if the DMA count is not a multiple
+ * of the DMA burst size. Let's add a rule to enforce that.
+ */
+ snd_pcm_hw_constraint_step(runtime, 0,
+ SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 128);
+ snd_pcm_hw_constraint_step(runtime, 0,
+ SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 128);
+ snd_pcm_hw_constraint_integer(substream->runtime,
+ SNDRV_PCM_HW_PARAM_PERIODS);
+
+ return 0;
+}
+
+static const struct snd_soc_component_driver loongson_i2s_component_driver = {
+ .name = LS_I2S_DRVNAME,
+ .open = loongson_pcm_open,
+};
+
+static const struct regmap_config loongson_i2s_regmap_config = {
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ .max_register = 0x14,
+ .cache_type = REGCACHE_FLAT,
+};
+
+static int loongson_i2s_apbdma_config(struct platform_device *pdev)
+{
+ int val;
+ void __iomem *regs;
+
+ regs = devm_platform_ioremap_resource(pdev, 1);
+ if (IS_ERR(regs))
+ return PTR_ERR(regs);
+
+ val = readl(regs);
+ val |= LOONGSON_DMA2_CONF << LOONGSON_I2S_TX_DMA_OFFSET;
+ val |= LOONGSON_DMA3_CONF << LOONGSON_I2S_RX_DMA_OFFSET;
+ writel(val, regs);
+
+ return 0;
+}
+
+static int loongson_i2s_plat_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct loongson_i2s *i2s;
+ struct resource *res;
+ struct clk *i2s_clk;
+ int ret;
+
+ i2s = devm_kzalloc(dev, sizeof(*i2s), GFP_KERNEL);
+ if (!i2s)
+ return -ENOMEM;
+
+ ret = loongson_i2s_apbdma_config(pdev);
+ if (ret)
+ return ret;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ i2s->reg_base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(i2s->reg_base))
+ return dev_err_probe(dev, PTR_ERR(i2s->reg_base),
+ "devm_ioremap_resource failed\n");
+
+ i2s->regmap = devm_regmap_init_mmio(dev, i2s->reg_base,
+ &loongson_i2s_regmap_config);
+ if (IS_ERR(i2s->regmap))
+ return dev_err_probe(dev, PTR_ERR(i2s->regmap),
+ "devm_regmap_init_mmio failed\n");
+
+ i2s->playback_dma_data.addr = res->start + LS_I2S_TX_DATA;
+ i2s->playback_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ i2s->playback_dma_data.maxburst = 4;
+
+ i2s->capture_dma_data.addr = res->start + LS_I2S_RX_DATA;
+ i2s->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ i2s->capture_dma_data.maxburst = 4;
+
+ i2s_clk = devm_clk_get_enabled(dev, NULL);
+ if (IS_ERR(i2s_clk))
+ return dev_err_probe(dev, PTR_ERR(i2s_clk), "clock property invalid\n");
+ i2s->clk_rate = clk_get_rate(i2s_clk);
+
+ dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
+ dev_set_name(dev, LS_I2S_DRVNAME);
+ dev_set_drvdata(dev, i2s);
+
+ ret = devm_snd_soc_register_component(dev, &loongson_i2s_component_driver,
+ &loongson_i2s_dai, 1);
+ if (ret)
+ return dev_err_probe(dev, ret, "failed to register DAI\n");
+
+ return devm_snd_dmaengine_pcm_register(dev, &loongson_dmaengine_pcm_config,
+ SND_DMAENGINE_PCM_FLAG_COMPAT);
+}
+
+static const struct of_device_id loongson_i2s_ids[] = {
+ { .compatible = "loongson,ls2k1000-i2s" },
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, loongson_i2s_ids);
+
+static struct platform_driver loongson_i2s_driver = {
+ .probe = loongson_i2s_plat_probe,
+ .driver = {
+ .name = "loongson-i2s-plat",
+ .pm = pm_sleep_ptr(&loongson_i2s_pm),
+ .of_match_table = loongson_i2s_ids,
+ },
+};
+module_platform_driver(loongson_i2s_driver);
+
+MODULE_DESCRIPTION("Loongson I2S Master Mode ASoC Driver");
+MODULE_AUTHOR("Loongson Technology Corporation Limited");
+MODULE_LICENSE("GPL");
--
2.43.5
