summaryrefslogtreecommitdiffstats
path: root/sound/soc/bcm/bcm63xx-i2s-whistler.c
diff options
context:
space:
mode:
Diffstat (limited to 'sound/soc/bcm/bcm63xx-i2s-whistler.c')
-rw-r--r--sound/soc/bcm/bcm63xx-i2s-whistler.c318
1 files changed, 318 insertions, 0 deletions
diff --git a/sound/soc/bcm/bcm63xx-i2s-whistler.c b/sound/soc/bcm/bcm63xx-i2s-whistler.c
new file mode 100644
index 000000000..2da1384ff
--- /dev/null
+++ b/sound/soc/bcm/bcm63xx-i2s-whistler.c
@@ -0,0 +1,318 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+// linux/sound/bcm/bcm63xx-i2s-whistler.c
+// BCM63xx whistler i2s driver
+// Copyright (c) 2020 Broadcom Corporation
+// Author: Kevin-Ke Li <kevin-ke.li@broadcom.com>
+
+#include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include "bcm63xx-i2s.h"
+
+#define DRV_NAME "brcm-i2s"
+
+static bool brcm_i2s_wr_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case I2S_TX_CFG ... I2S_TX_DESC_IFF_LEN:
+ case I2S_TX_CFG_2 ... I2S_RX_DESC_IFF_LEN:
+ case I2S_RX_CFG_2 ... I2S_REG_MAX:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static bool brcm_i2s_rd_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case I2S_TX_CFG ... I2S_REG_MAX:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static bool brcm_i2s_volatile_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case I2S_TX_CFG:
+ case I2S_TX_IRQ_CTL:
+ case I2S_TX_DESC_IFF_ADDR:
+ case I2S_TX_DESC_IFF_LEN:
+ case I2S_TX_DESC_OFF_ADDR:
+ case I2S_TX_DESC_OFF_LEN:
+ case I2S_TX_CFG_2:
+ case I2S_RX_CFG:
+ case I2S_RX_IRQ_CTL:
+ case I2S_RX_DESC_OFF_ADDR:
+ case I2S_RX_DESC_OFF_LEN:
+ case I2S_RX_DESC_IFF_LEN:
+ case I2S_RX_DESC_IFF_ADDR:
+ case I2S_RX_CFG_2:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static const struct regmap_config brcm_i2s_regmap_config = {
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ .max_register = I2S_REG_MAX,
+ .writeable_reg = brcm_i2s_wr_reg,
+ .readable_reg = brcm_i2s_rd_reg,
+ .volatile_reg = brcm_i2s_volatile_reg,
+ .cache_type = REGCACHE_FLAT,
+};
+
+static int bcm63xx_i2s_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai)
+{
+ int ret = 0;
+ struct bcm_i2s_priv *i2s_priv = snd_soc_dai_get_drvdata(dai);
+
+ ret = clk_set_rate(i2s_priv->i2s_clk, params_rate(params));
+ if (ret < 0)
+ dev_err(i2s_priv->dev,
+ "Can't set sample rate, err: %d\n", ret);
+
+ return ret;
+}
+
+static int bcm63xx_i2s_startup(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ unsigned int slavemode;
+ struct bcm_i2s_priv *i2s_priv = snd_soc_dai_get_drvdata(dai);
+ struct regmap *regmap_i2s = i2s_priv->regmap_i2s;
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ regmap_update_bits(regmap_i2s, I2S_TX_CFG,
+ I2S_TX_OUT_R | I2S_TX_DATA_ALIGNMENT |
+ I2S_TX_DATA_ENABLE | I2S_TX_CLOCK_ENABLE,
+ I2S_TX_OUT_R | I2S_TX_DATA_ALIGNMENT |
+ I2S_TX_DATA_ENABLE | I2S_TX_CLOCK_ENABLE);
+ regmap_write(regmap_i2s, I2S_TX_IRQ_CTL, 0);
+ regmap_write(regmap_i2s, I2S_TX_IRQ_IFF_THLD, 0);
+ regmap_write(regmap_i2s, I2S_TX_IRQ_OFF_THLD, 1);
+
+ /* TX and RX block each have an independent bit to indicate
+ * if it is generating the clock for the I2S bus. The bus
+ * clocks need to be generated from either the TX or RX block,
+ * but not both
+ */
+ regmap_read(regmap_i2s, I2S_RX_CFG_2, &slavemode);
+ if (slavemode & I2S_RX_SLAVE_MODE_MASK)
+ regmap_update_bits(regmap_i2s, I2S_TX_CFG_2,
+ I2S_TX_SLAVE_MODE_MASK,
+ I2S_TX_MASTER_MODE);
+ else
+ regmap_update_bits(regmap_i2s, I2S_TX_CFG_2,
+ I2S_TX_SLAVE_MODE_MASK,
+ I2S_TX_SLAVE_MODE);
+ } else {
+ regmap_update_bits(regmap_i2s, I2S_RX_CFG,
+ I2S_RX_IN_R | I2S_RX_DATA_ALIGNMENT |
+ I2S_RX_CLOCK_ENABLE,
+ I2S_RX_IN_R | I2S_RX_DATA_ALIGNMENT |
+ I2S_RX_CLOCK_ENABLE);
+ regmap_write(regmap_i2s, I2S_RX_IRQ_CTL, 0);
+ regmap_write(regmap_i2s, I2S_RX_IRQ_IFF_THLD, 0);
+ regmap_write(regmap_i2s, I2S_RX_IRQ_OFF_THLD, 1);
+
+ regmap_read(regmap_i2s, I2S_TX_CFG_2, &slavemode);
+ if (slavemode & I2S_TX_SLAVE_MODE_MASK)
+ regmap_update_bits(regmap_i2s, I2S_RX_CFG_2,
+ I2S_RX_SLAVE_MODE_MASK, 0);
+ else
+ regmap_update_bits(regmap_i2s, I2S_RX_CFG_2,
+ I2S_RX_SLAVE_MODE_MASK,
+ I2S_RX_SLAVE_MODE);
+ }
+ return 0;
+}
+
+static void bcm63xx_i2s_shutdown(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ unsigned int enabled, slavemode;
+ struct bcm_i2s_priv *i2s_priv = snd_soc_dai_get_drvdata(dai);
+ struct regmap *regmap_i2s = i2s_priv->regmap_i2s;
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ regmap_update_bits(regmap_i2s, I2S_TX_CFG,
+ I2S_TX_OUT_R | I2S_TX_DATA_ALIGNMENT |
+ I2S_TX_DATA_ENABLE | I2S_TX_CLOCK_ENABLE, 0);
+ regmap_write(regmap_i2s, I2S_TX_IRQ_CTL, 1);
+ regmap_write(regmap_i2s, I2S_TX_IRQ_IFF_THLD, 4);
+ regmap_write(regmap_i2s, I2S_TX_IRQ_OFF_THLD, 4);
+
+ regmap_read(regmap_i2s, I2S_TX_CFG_2, &slavemode);
+ slavemode = slavemode & I2S_TX_SLAVE_MODE_MASK;
+ if (!slavemode) {
+ regmap_read(regmap_i2s, I2S_RX_CFG, &enabled);
+ enabled = enabled & I2S_RX_ENABLE_MASK;
+ if (enabled)
+ regmap_update_bits(regmap_i2s, I2S_RX_CFG_2,
+ I2S_RX_SLAVE_MODE_MASK,
+ I2S_RX_MASTER_MODE);
+ }
+ regmap_update_bits(regmap_i2s, I2S_TX_CFG_2,
+ I2S_TX_SLAVE_MODE_MASK,
+ I2S_TX_SLAVE_MODE);
+ } else {
+ regmap_update_bits(regmap_i2s, I2S_RX_CFG,
+ I2S_RX_IN_R | I2S_RX_DATA_ALIGNMENT |
+ I2S_RX_CLOCK_ENABLE, 0);
+ regmap_write(regmap_i2s, I2S_RX_IRQ_CTL, 1);
+ regmap_write(regmap_i2s, I2S_RX_IRQ_IFF_THLD, 4);
+ regmap_write(regmap_i2s, I2S_RX_IRQ_OFF_THLD, 4);
+
+ regmap_read(regmap_i2s, I2S_RX_CFG_2, &slavemode);
+ slavemode = slavemode & I2S_RX_SLAVE_MODE_MASK;
+ if (!slavemode) {
+ regmap_read(regmap_i2s, I2S_TX_CFG, &enabled);
+ enabled = enabled & I2S_TX_ENABLE_MASK;
+ if (enabled)
+ regmap_update_bits(regmap_i2s, I2S_TX_CFG_2,
+ I2S_TX_SLAVE_MODE_MASK,
+ I2S_TX_MASTER_MODE);
+ }
+
+ regmap_update_bits(regmap_i2s, I2S_RX_CFG_2,
+ I2S_RX_SLAVE_MODE_MASK, I2S_RX_SLAVE_MODE);
+ }
+}
+
+static const struct snd_soc_dai_ops bcm63xx_i2s_dai_ops = {
+ .startup = bcm63xx_i2s_startup,
+ .shutdown = bcm63xx_i2s_shutdown,
+ .hw_params = bcm63xx_i2s_hw_params,
+};
+
+static struct snd_soc_dai_driver bcm63xx_i2s_dai = {
+ .name = DRV_NAME,
+ .playback = {
+ .channels_min = 2,
+ .channels_max = 2,
+ .rates = SNDRV_PCM_RATE_8000_192000,
+ .formats = SNDRV_PCM_FMTBIT_S32_LE,
+ },
+ .capture = {
+ .channels_min = 2,
+ .channels_max = 2,
+ .rates = SNDRV_PCM_RATE_8000_192000,
+ .formats = SNDRV_PCM_FMTBIT_S32_LE,
+ },
+ .ops = &bcm63xx_i2s_dai_ops,
+ .symmetric_rate = 1,
+ .symmetric_channels = 1,
+};
+
+static const struct snd_soc_component_driver bcm63xx_i2s_component = {
+ .name = "bcm63xx",
+ .legacy_dai_naming = 1,
+};
+
+static int bcm63xx_i2s_dev_probe(struct platform_device *pdev)
+{
+ int ret = 0;
+ void __iomem *regs;
+ struct resource *r_mem, *region;
+ struct bcm_i2s_priv *i2s_priv;
+ struct regmap *regmap_i2s;
+ struct clk *i2s_clk;
+
+ i2s_priv = devm_kzalloc(&pdev->dev, sizeof(*i2s_priv), GFP_KERNEL);
+ if (!i2s_priv)
+ return -ENOMEM;
+
+ i2s_clk = devm_clk_get(&pdev->dev, "i2sclk");
+ if (IS_ERR(i2s_clk)) {
+ dev_err(&pdev->dev, "%s: cannot get a brcm clock: %ld\n",
+ __func__, PTR_ERR(i2s_clk));
+ return PTR_ERR(i2s_clk);
+ }
+
+ r_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!r_mem) {
+ dev_err(&pdev->dev, "Unable to get register resource.\n");
+ return -ENODEV;
+ }
+
+ region = devm_request_mem_region(&pdev->dev, r_mem->start,
+ resource_size(r_mem), DRV_NAME);
+ if (!region) {
+ dev_err(&pdev->dev, "Memory region already claimed\n");
+ return -EBUSY;
+ }
+
+ regs = devm_ioremap_resource(&pdev->dev, r_mem);
+ if (IS_ERR(regs)) {
+ ret = PTR_ERR(regs);
+ return ret;
+ }
+
+ regmap_i2s = devm_regmap_init_mmio(&pdev->dev,
+ regs, &brcm_i2s_regmap_config);
+ if (IS_ERR(regmap_i2s))
+ return PTR_ERR(regmap_i2s);
+
+ regmap_update_bits(regmap_i2s, I2S_MISC_CFG,
+ I2S_PAD_LVL_LOOP_DIS_MASK,
+ I2S_PAD_LVL_LOOP_DIS_ENABLE);
+
+ ret = devm_snd_soc_register_component(&pdev->dev,
+ &bcm63xx_i2s_component,
+ &bcm63xx_i2s_dai, 1);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to register the dai\n");
+ return ret;
+ }
+
+ i2s_priv->dev = &pdev->dev;
+ i2s_priv->i2s_clk = i2s_clk;
+ i2s_priv->regmap_i2s = regmap_i2s;
+ dev_set_drvdata(&pdev->dev, i2s_priv);
+
+ ret = bcm63xx_soc_platform_probe(pdev, i2s_priv);
+ if (ret)
+ dev_err(&pdev->dev, "failed to register the pcm\n");
+
+ return ret;
+}
+
+static int bcm63xx_i2s_dev_remove(struct platform_device *pdev)
+{
+ bcm63xx_soc_platform_remove(pdev);
+ return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id snd_soc_bcm_audio_match[] = {
+ {.compatible = "brcm,bcm63xx-i2s"},
+ { }
+};
+#endif
+
+static struct platform_driver bcm63xx_i2s_driver = {
+ .driver = {
+ .name = DRV_NAME,
+ .of_match_table = of_match_ptr(snd_soc_bcm_audio_match),
+ },
+ .probe = bcm63xx_i2s_dev_probe,
+ .remove = bcm63xx_i2s_dev_remove,
+};
+
+module_platform_driver(bcm63xx_i2s_driver);
+
+MODULE_AUTHOR("Kevin,Li <kevin-ke.li@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom DSL XPON ASOC I2S Interface");
+MODULE_LICENSE("GPL v2");