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Diffstat (limited to 'sound/soc/tegra/tegra20_das.c')
-rw-r--r--sound/soc/tegra/tegra20_das.c198
1 files changed, 95 insertions, 103 deletions
diff --git a/sound/soc/tegra/tegra20_das.c b/sound/soc/tegra/tegra20_das.c
index 69c651274c12..c620ab0c601f 100644
--- a/sound/soc/tegra/tegra20_das.c
+++ b/sound/soc/tegra/tegra20_das.c
@@ -13,84 +13,119 @@
#include <linux/regmap.h>
#include <linux/slab.h>
#include <sound/soc.h>
-#include "tegra20_das.h"
#define DRV_NAME "tegra20-das"
-static struct tegra20_das *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
-static inline void tegra20_das_write(u32 reg, u32 val)
-{
- regmap_write(das->regmap, reg, val);
-}
-
-static inline u32 tegra20_das_read(u32 reg)
-{
- u32 val;
+/*
+ * 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
- regmap_read(das->regmap, reg, &val);
- return val;
-}
+/*
+ * Names/IDs of the DACs/DAPs.
+ */
-int tegra20_das_connect_dap_to_dac(int dap, int dac)
-{
- u32 addr;
- u32 reg;
+#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
- if (!das)
- return -ENODEV;
+#define TEGRA20_DAS_DAC_ID_1 0
+#define TEGRA20_DAS_DAC_ID_2 1
+#define TEGRA20_DAS_DAC_ID_3 2
- addr = TEGRA20_DAS_DAP_CTRL_SEL +
- (dap * TEGRA20_DAS_DAP_CTRL_SEL_STRIDE);
- reg = dac << TEGRA20_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_P;
+struct tegra20_das {
+ struct regmap *regmap;
+};
- tegra20_das_write(addr, reg);
+/*
+ * 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.
+ */
- return 0;
+static inline void tegra20_das_write(struct tegra20_das *das, u32 reg, u32 val)
+{
+ regmap_write(das->regmap, reg, val);
}
-EXPORT_SYMBOL_GPL(tegra20_das_connect_dap_to_dac);
-int tegra20_das_connect_dap_to_dap(int dap, int otherdap, int master,
- int sdata1rx, int sdata2rx)
+static void tegra20_das_connect_dap_to_dac(struct tegra20_das *das, int dap, int dac)
{
u32 addr;
u32 reg;
- if (!das)
- return -ENODEV;
-
addr = TEGRA20_DAS_DAP_CTRL_SEL +
(dap * TEGRA20_DAS_DAP_CTRL_SEL_STRIDE);
- reg = (otherdap << TEGRA20_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_P) |
- (!!sdata2rx << TEGRA20_DAS_DAP_CTRL_SEL_DAP_SDATA2_TX_RX_P) |
- (!!sdata1rx << TEGRA20_DAS_DAP_CTRL_SEL_DAP_SDATA1_TX_RX_P) |
- (!!master << TEGRA20_DAS_DAP_CTRL_SEL_DAP_MS_SEL_P);
-
- tegra20_das_write(addr, reg);
+ reg = dac << TEGRA20_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_P;
- return 0;
+ tegra20_das_write(das, addr, reg);
}
-EXPORT_SYMBOL_GPL(tegra20_das_connect_dap_to_dap);
-int tegra20_das_connect_dac_to_dap(int dac, int dap)
+static void tegra20_das_connect_dac_to_dap(struct tegra20_das *das, int dac, int dap)
{
u32 addr;
u32 reg;
- if (!das)
- return -ENODEV;
-
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(addr, reg);
-
- return 0;
+ tegra20_das_write(das, addr, reg);
}
-EXPORT_SYMBOL_GPL(tegra20_das_connect_dac_to_dap);
#define LAST_REG(name) \
(TEGRA20_DAS_##name + \
@@ -120,73 +155,31 @@ static const struct regmap_config tegra20_das_regmap_config = {
static int tegra20_das_probe(struct platform_device *pdev)
{
void __iomem *regs;
- int ret = 0;
-
- if (das)
- return -ENODEV;
+ struct tegra20_das *das;
das = devm_kzalloc(&pdev->dev, sizeof(struct tegra20_das), GFP_KERNEL);
- if (!das) {
- ret = -ENOMEM;
- goto err;
- }
- das->dev = &pdev->dev;
+ if (!das)
+ return -ENOMEM;
regs = devm_platform_ioremap_resource(pdev, 0);
- if (IS_ERR(regs)) {
- ret = PTR_ERR(regs);
- goto err;
- }
+ 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");
- ret = PTR_ERR(das->regmap);
- goto err;
- }
-
- ret = tegra20_das_connect_dap_to_dac(TEGRA20_DAS_DAP_ID_1,
- TEGRA20_DAS_DAP_SEL_DAC1);
- if (ret) {
- dev_err(&pdev->dev, "Can't set up DAS DAP connection\n");
- goto err;
- }
- ret = tegra20_das_connect_dac_to_dap(TEGRA20_DAS_DAC_ID_1,
- TEGRA20_DAS_DAC_SEL_DAP1);
- if (ret) {
- dev_err(&pdev->dev, "Can't set up DAS DAC connection\n");
- goto err;
- }
-
- ret = tegra20_das_connect_dap_to_dac(TEGRA20_DAS_DAP_ID_3,
- TEGRA20_DAS_DAP_SEL_DAC3);
- if (ret) {
- dev_err(&pdev->dev, "Can't set up DAS DAP connection\n");
- goto err;
+ return PTR_ERR(das->regmap);
}
- ret = tegra20_das_connect_dac_to_dap(TEGRA20_DAS_DAC_ID_3,
- TEGRA20_DAS_DAC_SEL_DAP3);
- if (ret) {
- dev_err(&pdev->dev, "Can't set up DAS DAC connection\n");
- goto err;
- }
-
- platform_set_drvdata(pdev, das);
-
- return 0;
-
-err:
- das = NULL;
- return ret;
-}
-
-static int tegra20_das_remove(struct platform_device *pdev)
-{
- if (!das)
- return -ENODEV;
- das = NULL;
+ 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;
}
@@ -198,7 +191,6 @@ static const struct of_device_id tegra20_das_of_match[] = {
static struct platform_driver tegra20_das_driver = {
.probe = tegra20_das_probe,
- .remove = tegra20_das_remove,
.driver = {
.name = DRV_NAME,
.of_match_table = tegra20_das_of_match,