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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /sound/soc/tegra/tegra20_das.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'sound/soc/tegra/tegra20_das.c')
-rw-r--r--sound/soc/tegra/tegra20_das.c205
1 files changed, 205 insertions, 0 deletions
diff --git a/sound/soc/tegra/tegra20_das.c b/sound/soc/tegra/tegra20_das.c
new file mode 100644
index 0000000000..c620ab0c60
--- /dev/null
+++ b/sound/soc/tegra/tegra20_das.c
@@ -0,0 +1,205 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * tegra20_das.c - Tegra20 DAS driver
+ *
+ * Author: Stephen Warren <swarren@nvidia.com>
+ * Copyright (C) 2010 - NVIDIA, Inc.
+ */
+
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <sound/soc.h>
+
+#define DRV_NAME "tegra20-das"
+
+/* Register TEGRA20_DAS_DAP_CTRL_SEL */
+#define TEGRA20_DAS_DAP_CTRL_SEL 0x00
+#define TEGRA20_DAS_DAP_CTRL_SEL_COUNT 5
+#define TEGRA20_DAS_DAP_CTRL_SEL_STRIDE 4
+#define TEGRA20_DAS_DAP_CTRL_SEL_DAP_MS_SEL_P 31
+#define TEGRA20_DAS_DAP_CTRL_SEL_DAP_MS_SEL_S 1
+#define TEGRA20_DAS_DAP_CTRL_SEL_DAP_SDATA1_TX_RX_P 30
+#define TEGRA20_DAS_DAP_CTRL_SEL_DAP_SDATA1_TX_RX_S 1
+#define TEGRA20_DAS_DAP_CTRL_SEL_DAP_SDATA2_TX_RX_P 29
+#define TEGRA20_DAS_DAP_CTRL_SEL_DAP_SDATA2_TX_RX_S 1
+#define TEGRA20_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_P 0
+#define TEGRA20_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_S 5
+
+/* Values for field TEGRA20_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL */
+#define TEGRA20_DAS_DAP_SEL_DAC1 0
+#define TEGRA20_DAS_DAP_SEL_DAC2 1
+#define TEGRA20_DAS_DAP_SEL_DAC3 2
+#define TEGRA20_DAS_DAP_SEL_DAP1 16
+#define TEGRA20_DAS_DAP_SEL_DAP2 17
+#define TEGRA20_DAS_DAP_SEL_DAP3 18
+#define TEGRA20_DAS_DAP_SEL_DAP4 19
+#define TEGRA20_DAS_DAP_SEL_DAP5 20
+
+/* Register TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL */
+#define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL 0x40
+#define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_COUNT 3
+#define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_STRIDE 4
+#define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA2_SEL_P 28
+#define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA2_SEL_S 4
+#define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA1_SEL_P 24
+#define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA1_SEL_S 4
+#define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_CLK_SEL_P 0
+#define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_CLK_SEL_S 4
+
+/*
+ * Values for:
+ * TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA2_SEL
+ * TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA1_SEL
+ * TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_CLK_SEL
+ */
+#define TEGRA20_DAS_DAC_SEL_DAP1 0
+#define TEGRA20_DAS_DAC_SEL_DAP2 1
+#define TEGRA20_DAS_DAC_SEL_DAP3 2
+#define TEGRA20_DAS_DAC_SEL_DAP4 3
+#define TEGRA20_DAS_DAC_SEL_DAP5 4
+
+/*
+ * Names/IDs of the DACs/DAPs.
+ */
+
+#define TEGRA20_DAS_DAP_ID_1 0
+#define TEGRA20_DAS_DAP_ID_2 1
+#define TEGRA20_DAS_DAP_ID_3 2
+#define TEGRA20_DAS_DAP_ID_4 3
+#define TEGRA20_DAS_DAP_ID_5 4
+
+#define TEGRA20_DAS_DAC_ID_1 0
+#define TEGRA20_DAS_DAC_ID_2 1
+#define TEGRA20_DAS_DAC_ID_3 2
+
+struct tegra20_das {
+ struct regmap *regmap;
+};
+
+/*
+ * Terminology:
+ * DAS: Digital audio switch (HW module controlled by this driver)
+ * DAP: Digital audio port (port/pins on Tegra device)
+ * DAC: Digital audio controller (e.g. I2S or AC97 controller elsewhere)
+ *
+ * The Tegra DAS is a mux/cross-bar which can connect each DAP to a specific
+ * DAC, or another DAP. When DAPs are connected, one must be the master and
+ * one the slave. Each DAC allows selection of a specific DAP for input, to
+ * cater for the case where N DAPs are connected to 1 DAC for broadcast
+ * output.
+ *
+ * This driver is dumb; no attempt is made to ensure that a valid routing
+ * configuration is programmed.
+ */
+
+static inline void tegra20_das_write(struct tegra20_das *das, u32 reg, u32 val)
+{
+ regmap_write(das->regmap, reg, val);
+}
+
+static void tegra20_das_connect_dap_to_dac(struct tegra20_das *das, int dap, int dac)
+{
+ u32 addr;
+ u32 reg;
+
+ addr = TEGRA20_DAS_DAP_CTRL_SEL +
+ (dap * TEGRA20_DAS_DAP_CTRL_SEL_STRIDE);
+ reg = dac << TEGRA20_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_P;
+
+ tegra20_das_write(das, addr, reg);
+}
+
+static void tegra20_das_connect_dac_to_dap(struct tegra20_das *das, int dac, int dap)
+{
+ u32 addr;
+ u32 reg;
+
+ addr = TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL +
+ (dac * TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_STRIDE);
+ reg = dap << TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_CLK_SEL_P |
+ dap << TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA1_SEL_P |
+ dap << TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA2_SEL_P;
+
+ tegra20_das_write(das, addr, reg);
+}
+
+#define LAST_REG(name) \
+ (TEGRA20_DAS_##name + \
+ (TEGRA20_DAS_##name##_STRIDE * (TEGRA20_DAS_##name##_COUNT - 1)))
+
+static bool tegra20_das_wr_rd_reg(struct device *dev, unsigned int reg)
+{
+ if (reg <= LAST_REG(DAP_CTRL_SEL))
+ return true;
+ if ((reg >= TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL) &&
+ (reg <= LAST_REG(DAC_INPUT_DATA_CLK_SEL)))
+ return true;
+
+ return false;
+}
+
+static const struct regmap_config tegra20_das_regmap_config = {
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ .max_register = LAST_REG(DAC_INPUT_DATA_CLK_SEL),
+ .writeable_reg = tegra20_das_wr_rd_reg,
+ .readable_reg = tegra20_das_wr_rd_reg,
+ .cache_type = REGCACHE_FLAT,
+};
+
+static int tegra20_das_probe(struct platform_device *pdev)
+{
+ void __iomem *regs;
+ struct tegra20_das *das;
+
+ das = devm_kzalloc(&pdev->dev, sizeof(struct tegra20_das), GFP_KERNEL);
+ if (!das)
+ return -ENOMEM;
+
+ regs = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(regs))
+ return PTR_ERR(regs);
+
+ das->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
+ &tegra20_das_regmap_config);
+ if (IS_ERR(das->regmap)) {
+ dev_err(&pdev->dev, "regmap init failed\n");
+ return PTR_ERR(das->regmap);
+ }
+
+ tegra20_das_connect_dap_to_dac(das, TEGRA20_DAS_DAP_ID_1,
+ TEGRA20_DAS_DAP_SEL_DAC1);
+ tegra20_das_connect_dac_to_dap(das, TEGRA20_DAS_DAC_ID_1,
+ TEGRA20_DAS_DAC_SEL_DAP1);
+ tegra20_das_connect_dap_to_dac(das, TEGRA20_DAS_DAP_ID_3,
+ TEGRA20_DAS_DAP_SEL_DAC3);
+ tegra20_das_connect_dac_to_dap(das, TEGRA20_DAS_DAC_ID_3,
+ TEGRA20_DAS_DAC_SEL_DAP3);
+
+ return 0;
+}
+
+static const struct of_device_id tegra20_das_of_match[] = {
+ { .compatible = "nvidia,tegra20-das", },
+ {},
+};
+
+static struct platform_driver tegra20_das_driver = {
+ .probe = tegra20_das_probe,
+ .driver = {
+ .name = DRV_NAME,
+ .of_match_table = tegra20_das_of_match,
+ },
+};
+module_platform_driver(tegra20_das_driver);
+
+MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
+MODULE_DESCRIPTION("Tegra20 DAS driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRV_NAME);
+MODULE_DEVICE_TABLE(of, tegra20_das_of_match);