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>

diff --git a/sound/soc/loongson/Kconfig b/sound/soc/loongson/Kconfig
index b8d7e2bade246f54c0f09144b9e55b50ce6395a3..e641ae4156d9a37701926df183eaf487c7ac72cf 100644 (file)
--- a/sound/soc/loongson/Kconfig
+++ b/sound/soc/loongson/Kconfig
@@ -1,11 +1,22 @@
 # SPDX-License-Identifier: GPL-2.0
 menu "SoC Audio for Loongson CPUs"
+
+config SND_SOC_LOONGSON_CARD
+       tristate "Loongson Sound Card Driver"
        depends on LOONGARCH || COMPILE_TEST
+       select SND_SOC_LOONGSON_I2S_PCI if PCI
+       select SND_SOC_LOONGSON_I2S_PLATFORM if OF
+       help
+         Say Y or M if you want to add support for SoC audio using
+         loongson I2S controller.
+
+         The driver add support for ALSA SoC Audio support using
+         loongson I2S controller.
 
 config SND_SOC_LOONGSON_I2S_PCI
        tristate "Loongson I2S-PCI Device Driver"
+       depends on LOONGARCH || COMPILE_TEST
        select REGMAP_MMIO
-       depends on PCI
        help
          Say Y or M if you want to add support for I2S driver for
          Loongson I2S controller.
@@ -13,15 +24,15 @@ 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_CARD
-       tristate "Loongson Sound Card Driver"
-       select SND_SOC_LOONGSON_I2S_PCI
-       depends on PCI
+config SND_SOC_LOONGSON_I2S_PLATFORM
+       tristate "Loongson I2S-PLAT Device Driver"
+       depends on LOONGARCH || COMPILE_TEST
+       select REGMAP_MMIO
+       select SND_SOC_GENERIC_DMAENGINE_PCM
        help
-         Say Y or M if you want to add support for SoC audio using
-         loongson I2S controller.
-
-         The driver add support for ALSA SoC Audio support using
-         loongson I2S controller.
+         Say Y or M if you want to add support for I2S driver for
+         Loongson I2S controller.
 
+         The controller work as a platform device, we can found it in
+         Loongson-2K1000 SoCs.
 endmenu

diff --git a/sound/soc/loongson/Makefile b/sound/soc/loongson/Makefile
index 578030ad6563cf9ac72224d586a8fa3a32bf9184..f396259244a32fdb67fa9d3316e351ec62400b24 100644 (file)
--- 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 (file)
index 0000000..fa2e450
--- /dev/null
+++ b/sound/soc/loongson/loongson_i2s_plat.c
@@ -0,0 +1,185 @@
+// 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@loongson.cn>
+//         Binbin Zhou <zhoubinbin@loongson.cn>
+
+#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");