diff options
Diffstat (limited to 'sound/soc/tegra/tegra20_das.c')
| -rw-r--r-- | sound/soc/tegra/tegra20_das.c | 198 |
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, |