--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * AC97 Controller Driver for Loongson-1 SoC
+ *
+ * Copyright (C) 2025 Keguang Zhang <keguang.zhang@gmail.com>
+ */
+
+#include <linux/bitfield.h>
+#include <linux/dma-mapping.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#include <sound/dmaengine_pcm.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+/* Loongson-1 AC97 Controller Registers */
+#define AC97_CSR 0x0
+#define AC97_OCC0 0x4
+#define AC97_ICC 0x10
+#define AC97_CRAC 0x18
+#define AC97_INTRAW 0x54
+#define AC97_INTM 0x58
+#define AC97_INT_CW_CLR 0x68
+#define AC97_INT_CR_CLR 0x6c
+
+/* Control Status Register Bits (CSR) */
+#define CSR_RESUME BIT(1)
+#define CSR_RST_FORCE BIT(0)
+
+/* MIC Channel Configuration Bits */
+#define M_DMA_EN BIT(22)
+#define M_FIFO_THRES GENMASK(21, 20)
+#define M_FIFO_THRES_FULL FIELD_PREP(M_FIFO_THRES, 3)
+#define M_FIFO_THRES_HALF FIELD_PREP(M_FIFO_THRES, 1)
+#define M_FIFO_THRES_QUARTER FIELD_PREP(M_FIFO_THRES, 0)
+#define M_SW GENMASK(19, 18)
+#define M_SW_16_BITS FIELD_PREP(M_SW, 2)
+#define M_SW_8_BITS FIELD_PREP(M_SW, 0)
+#define M_VSR BIT(17)
+#define M_CH_EN BIT(16)
+/* Right Channel Configuration Bits */
+#define R_DMA_EN BIT(14)
+#define R_FIFO_THRES GENMASK(13, 12)
+#define R_FIFO_THRES_EMPTY FIELD_PREP(R_FIFO_THRES, 3)
+#define R_FIFO_THRES_HALF FIELD_PREP(R_FIFO_THRES, 1)
+#define R_FIFO_THRES_QUARTER FIELD_PREP(R_FIFO_THRES, 0)
+#define R_SW GENMASK(11, 10)
+#define R_SW_16_BITS FIELD_PREP(R_SW, 2)
+#define R_SW_8_BITS FIELD_PREP(R_SW, 0)
+#define R_VSR BIT(9)
+#define R_CH_EN BIT(8)
+/* Left Channel Configuration Bits */
+#define L_DMA_EN BIT(6)
+#define L_FIFO_THRES GENMASK(5, 4)
+#define L_FIFO_THRES_EMPTY FIELD_PREP(L_FIFO_THRES, 3)
+#define L_FIFO_THRES_HALF FIELD_PREP(L_FIFO_THRES, 1)
+#define L_FIFO_THRES_QUARTER FIELD_PREP(L_FIFO_THRES, 0)
+#define L_SW GENMASK(3, 2)
+#define L_SW_16_BITS FIELD_PREP(L_SW, 2)
+#define L_SW_8_BITS FIELD_PREP(L_SW, 0)
+#define L_VSR BIT(1)
+#define L_CH_EN BIT(0)
+
+/* Codec Register Access Command Bits (CRAC) */
+#define CODEC_WR BIT(31)
+#define CODEC_ADR GENMASK(22, 16)
+#define CODEC_DAT GENMASK(15, 0)
+
+/* Interrupt Register (INTRAW) */
+#define CW_DONE BIT(1)
+#define CR_DONE BIT(0)
+
+#define LS1X_AC97_DMA_TX_EN BIT(31)
+#define LS1X_AC97_DMA_STEREO BIT(30)
+#define LS1X_AC97_DMA_TX_BYTES GENMASK(29, 28)
+#define LS1X_AC97_DMA_TX_4_BYTES FIELD_PREP(LS1X_AC97_DMA_TX_BYTES, 2)
+#define LS1X_AC97_DMA_TX_2_BYTES FIELD_PREP(LS1X_AC97_DMA_TX_BYTES, 1)
+#define LS1X_AC97_DMA_TX_1_BYTE FIELD_PREP(LS1X_AC97_DMA_TX_BYTES, 0)
+#define LS1X_AC97_DMA_DADDR_MASK GENMASK(27, 0)
+
+#define LS1X_AC97_DMA_FIFO_SIZE 128
+
+#define LS1X_AC97_TIMEOUT 3000
+
+struct ls1x_ac97 {
+ void __iomem *reg_base;
+ struct regmap *regmap;
+ dma_addr_t tx_dma_base;
+ dma_addr_t rx_dma_base;
+ struct snd_dmaengine_dai_dma_data capture_dma_data;
+ struct snd_dmaengine_dai_dma_data playback_dma_data;
+};
+
+static struct ls1x_ac97 *ls1x_ac97;
+
+static const struct regmap_config ls1x_ac97_regmap_config = {
+ .reg_bits = 32,
+ .val_bits = 32,
+ .reg_stride = 4,
+};
+
+static void ls1x_ac97_reset(struct snd_ac97 *ac97)
+{
+ int val;
+
+ regmap_write(ls1x_ac97->regmap, AC97_CSR, CSR_RST_FORCE);
+ regmap_read_poll_timeout(ls1x_ac97->regmap, AC97_CSR, val,
+ !(val & CSR_RESUME), 0, LS1X_AC97_TIMEOUT);
+}
+
+static void ls1x_ac97_write(struct snd_ac97 *ac97, unsigned short reg, unsigned short val)
+{
+ int tmp, ret;
+
+ tmp = FIELD_PREP(CODEC_ADR, reg) | FIELD_PREP(CODEC_DAT, val);
+ regmap_write(ls1x_ac97->regmap, AC97_CRAC, tmp);
+ ret = regmap_read_poll_timeout(ls1x_ac97->regmap, AC97_INTRAW, tmp,
+ (tmp & CW_DONE), 0, LS1X_AC97_TIMEOUT);
+ if (ret)
+ pr_err("timeout on AC97 write! %d\n", ret);
+
+ regmap_read(ls1x_ac97->regmap, AC97_INT_CW_CLR, &ret);
+}
+
+static unsigned short ls1x_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
+{
+ int val, ret;
+
+ val = CODEC_WR | FIELD_PREP(CODEC_ADR, reg);
+ regmap_write(ls1x_ac97->regmap, AC97_CRAC, val);
+ ret = regmap_read_poll_timeout(ls1x_ac97->regmap, AC97_INTRAW, val,
+ (val & CR_DONE), 0, LS1X_AC97_TIMEOUT);
+ if (ret) {
+ pr_err("timeout on AC97 read! %d\n", ret);
+ return ret;
+ }
+
+ regmap_read(ls1x_ac97->regmap, AC97_INT_CR_CLR, &ret);
+ regmap_read(ls1x_ac97->regmap, AC97_CRAC, &ret);
+
+ return (ret & CODEC_DAT);
+}
+
+static void ls1x_ac97_init(struct snd_ac97 *ac97)
+{
+ writel(0, ls1x_ac97->reg_base + AC97_INTRAW);
+ writel(0, ls1x_ac97->reg_base + AC97_INTM);
+
+ /* Config output channels */
+ regmap_update_bits(ls1x_ac97->regmap, AC97_OCC0,
+ R_DMA_EN | R_FIFO_THRES | R_CH_EN |
+ L_DMA_EN | L_FIFO_THRES | L_CH_EN,
+ R_DMA_EN | R_FIFO_THRES_EMPTY | R_CH_EN |
+ L_DMA_EN | L_FIFO_THRES_EMPTY | L_CH_EN);
+
+ /* Config inputs channel */
+ regmap_update_bits(ls1x_ac97->regmap, AC97_ICC,
+ M_DMA_EN | M_FIFO_THRES | M_CH_EN |
+ R_DMA_EN | R_FIFO_THRES | R_CH_EN |
+ L_DMA_EN | L_FIFO_THRES | L_CH_EN,
+ M_DMA_EN | M_FIFO_THRES_FULL | M_CH_EN |
+ R_DMA_EN | R_FIFO_THRES_EMPTY | R_CH_EN |
+ L_DMA_EN | L_FIFO_THRES_EMPTY | L_CH_EN);
+
+ if (ac97->ext_id & AC97_EI_VRA) {
+ regmap_update_bits(ls1x_ac97->regmap, AC97_OCC0, R_VSR | L_VSR, R_VSR | L_VSR);
+ regmap_update_bits(ls1x_ac97->regmap, AC97_ICC, M_VSR, M_VSR);
+ }
+}
+
+static struct snd_ac97_bus_ops ls1x_ac97_ops = {
+ .reset = ls1x_ac97_reset,
+ .write = ls1x_ac97_write,
+ .read = ls1x_ac97_read,
+ .init = ls1x_ac97_init,
+};
+
+static int ls1x_ac97_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *cpu_dai)
+{
+ struct ls1x_ac97 *ac97 = dev_get_drvdata(cpu_dai->dev);
+ struct snd_dmaengine_dai_dma_data *dma_data = snd_soc_dai_get_dma_data(cpu_dai, substream);
+
+ switch (params_channels(params)) {
+ case 1:
+ dma_data->addr &= ~LS1X_AC97_DMA_STEREO;
+ break;
+ case 2:
+ dma_data->addr |= LS1X_AC97_DMA_STEREO;
+ break;
+ default:
+ dev_err(cpu_dai->dev, "unsupported channels! %d\n", params_channels(params));
+ return -EINVAL;
+ }
+
+ switch (params_format(params)) {
+ case SNDRV_PCM_FORMAT_S8:
+ case SNDRV_PCM_FORMAT_U8:
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ regmap_update_bits(ac97->regmap, AC97_OCC0,
+ R_SW | L_SW,
+ R_SW_8_BITS | L_SW_8_BITS);
+ else
+ regmap_update_bits(ac97->regmap, AC97_ICC,
+ M_SW | R_SW | L_SW,
+ M_SW_8_BITS | R_SW_8_BITS | L_SW_8_BITS);
+ break;
+ case SNDRV_PCM_FORMAT_S16_LE:
+ case SNDRV_PCM_FORMAT_U16_LE:
+ case SNDRV_PCM_FORMAT_S16_BE:
+ case SNDRV_PCM_FORMAT_U16_BE:
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ regmap_update_bits(ac97->regmap, AC97_OCC0,
+ R_SW | L_SW,
+ R_SW_16_BITS | L_SW_16_BITS);
+ else
+ regmap_update_bits(ac97->regmap, AC97_ICC,
+ M_SW | R_SW | L_SW,
+ M_SW_16_BITS | R_SW_16_BITS | L_SW_16_BITS);
+ break;
+ default:
+ dev_err(cpu_dai->dev, "unsupported format! %d\n", params_format(params));
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int ls1x_ac97_dai_probe(struct snd_soc_dai *cpu_dai)
+{
+ struct ls1x_ac97 *ac97 = dev_get_drvdata(cpu_dai->dev);
+
+ ac97->capture_dma_data.addr = ac97->rx_dma_base & LS1X_AC97_DMA_DADDR_MASK;
+ ac97->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ ac97->capture_dma_data.fifo_size = LS1X_AC97_DMA_FIFO_SIZE;
+
+ ac97->playback_dma_data.addr = ac97->tx_dma_base & LS1X_AC97_DMA_DADDR_MASK;
+ ac97->playback_dma_data.addr |= LS1X_AC97_DMA_TX_4_BYTES;
+ ac97->playback_dma_data.addr |= LS1X_AC97_DMA_TX_EN;
+ ac97->playback_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ ac97->playback_dma_data.fifo_size = LS1X_AC97_DMA_FIFO_SIZE;
+
+ snd_soc_dai_init_dma_data(cpu_dai, &ac97->playback_dma_data, &ac97->capture_dma_data);
+ snd_soc_dai_set_drvdata(cpu_dai, ac97);
+
+ return 0;
+}
+
+static const struct snd_soc_dai_ops ls1x_ac97_dai_ops = {
+ .probe = ls1x_ac97_dai_probe,
+ .hw_params = ls1x_ac97_hw_params,
+};
+
+#define LS1X_AC97_FMTS (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U8 |\
+ SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE |\
+ SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_U16_BE)
+
+static struct snd_soc_dai_driver ls1x_ac97_dai[] = {
+ {
+ .name = "ls1x-ac97",
+ .playback = {
+ .stream_name = "AC97 Playback",
+ .channels_min = 1,
+ .channels_max = 2,
+ .rates = SNDRV_PCM_RATE_8000_48000,
+ .formats = LS1X_AC97_FMTS,
+ },
+ .capture = {
+ .stream_name = "AC97 Capture",
+ .channels_min = 1,
+ .channels_max = 2,
+ .rates = SNDRV_PCM_RATE_8000_48000,
+ .formats = LS1X_AC97_FMTS,
+ },
+ .ops = &ls1x_ac97_dai_ops,
+ },
+};
+
+static const struct snd_soc_component_driver ls1x_ac97_component = {
+ .name = KBUILD_MODNAME,
+ .legacy_dai_naming = 1,
+};
+
+static int ls1x_ac97_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct ls1x_ac97 *ac97;
+ struct resource *res;
+ int ret;
+
+ ac97 = devm_kzalloc(dev, sizeof(struct ls1x_ac97), GFP_KERNEL);
+ if (!ac97)
+ return -ENOMEM;
+ ls1x_ac97 = ac97;
+ platform_set_drvdata(pdev, ac97);
+
+ ac97->reg_base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(ac97->reg_base))
+ return PTR_ERR(ac97->reg_base);
+
+ ac97->regmap = devm_regmap_init_mmio(dev, ac97->reg_base, &ls1x_ac97_regmap_config);
+ if (IS_ERR(ac97->regmap))
+ return dev_err_probe(dev, PTR_ERR(ac97->regmap), "devm_regmap_init_mmio failed\n");
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "audio-tx");
+ if (!res)
+ return dev_err_probe(dev, -EINVAL, "Missing 'audio-tx' in reg-names property\n");
+
+ ac97->tx_dma_base = dma_map_resource(dev, res->start, resource_size(res),
+ DMA_TO_DEVICE, 0);
+ if (dma_mapping_error(dev, ac97->tx_dma_base))
+ return -ENXIO;
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "audio-rx");
+ if (!res)
+ return dev_err_probe(dev, -EINVAL, "Missing 'audio-rx' in reg-names property\n");
+
+ ac97->rx_dma_base = dma_map_resource(dev, res->start, resource_size(res),
+ DMA_FROM_DEVICE, 0);
+ if (dma_mapping_error(dev, ac97->rx_dma_base))
+ return -ENXIO;
+
+ ret = devm_snd_dmaengine_pcm_register(dev, NULL, 0);
+ if (ret)
+ dev_err_probe(dev, ret, "failed to register PCM\n");
+
+ ret = devm_snd_soc_register_component(dev, &ls1x_ac97_component,
+ ls1x_ac97_dai, ARRAY_SIZE(ls1x_ac97_dai));
+ if (ret)
+ dev_err_probe(dev, ret, "failed to register DAI\n");
+
+ return snd_soc_set_ac97_ops(&ls1x_ac97_ops);
+}
+
+static void ls1x_ac97_remove(struct platform_device *pdev)
+{
+ ls1x_ac97 = NULL;
+ snd_soc_set_ac97_ops(NULL);
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int ls1x_ac97_suspend(struct device *dev)
+{
+ int val;
+
+ regmap_clear_bits(ls1x_ac97->regmap, AC97_OCC0, R_DMA_EN | R_CH_EN | L_DMA_EN | L_CH_EN);
+ regmap_clear_bits(ls1x_ac97->regmap, AC97_ICC,
+ M_DMA_EN | M_CH_EN | R_DMA_EN | R_CH_EN | L_DMA_EN | L_CH_EN);
+ regmap_set_bits(ls1x_ac97->regmap, AC97_CSR, CSR_RESUME);
+
+ return regmap_read_poll_timeout(ls1x_ac97->regmap, AC97_CSR, val,
+ (val & CSR_RESUME), 0, LS1X_AC97_TIMEOUT);
+}
+
+static int ls1x_ac97_resume(struct device *dev)
+{
+ int val;
+
+ regmap_set_bits(ls1x_ac97->regmap, AC97_OCC0, R_DMA_EN | R_CH_EN | L_DMA_EN | L_CH_EN);
+ regmap_set_bits(ls1x_ac97->regmap, AC97_ICC,
+ M_DMA_EN | M_CH_EN | R_DMA_EN | R_CH_EN | L_DMA_EN | L_CH_EN);
+ regmap_set_bits(ls1x_ac97->regmap, AC97_CSR, CSR_RESUME);
+
+ return regmap_read_poll_timeout(ls1x_ac97->regmap, AC97_CSR, val,
+ !(val & CSR_RESUME), 0, LS1X_AC97_TIMEOUT);
+}
+#endif
+
+static const struct dev_pm_ops ls1x_ac97_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(ls1x_ac97_suspend, ls1x_ac97_resume)
+};
+
+static const struct of_device_id ls1x_ac97_match[] = {
+ { .compatible = "loongson,ls1b-ac97" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, ls1x_ac97_match);
+
+static struct platform_driver ls1x_ac97_driver = {
+ .probe = ls1x_ac97_probe,
+ .remove = ls1x_ac97_remove,
+ .driver = {
+ .name = KBUILD_MODNAME,
+ .of_match_table = ls1x_ac97_match,
+ .pm = &ls1x_ac97_pm_ops,
+ },
+};
+
+module_platform_driver(ls1x_ac97_driver);
+
+MODULE_AUTHOR("Keguang Zhang <keguang.zhang@gmail.com>");
+MODULE_DESCRIPTION("Loongson-1 AC97 Controller Driver");
+MODULE_LICENSE("GPL");
projects / users / jedix / linux-maple.git / commitdiff