diff options
Diffstat (limited to 'sound/soc/tegra/tegra_das.c')
| -rw-r--r-- | sound/soc/tegra/tegra_das.c | 265 |
1 files changed, 265 insertions, 0 deletions
diff --git a/sound/soc/tegra/tegra_das.c b/sound/soc/tegra/tegra_das.c new file mode 100644 index 00000000..9f24ef73 --- /dev/null +++ b/sound/soc/tegra/tegra_das.c @@ -0,0 +1,265 @@ +/* + * tegra_das.c - Tegra DAS driver + * + * Author: Stephen Warren <swarren@nvidia.com> + * Copyright (C) 2010 - NVIDIA, Inc. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA + * 02110-1301 USA + * + */ + +#include <linux/module.h> +#include <linux/debugfs.h> +#include <linux/device.h> +#include <linux/platform_device.h> +#include <linux/seq_file.h> +#include <linux/slab.h> +#include <linux/io.h> +#include <mach/iomap.h> +#include <sound/soc.h> +#include "tegra_das.h" + +#define DRV_NAME "tegra-das" + +static struct tegra_das *das; + +static inline void tegra_das_write(u32 reg, u32 val) +{ + __raw_writel(val, das->regs + reg); +} + +static inline u32 tegra_das_read(u32 reg) +{ + return __raw_readl(das->regs + reg); +} + +int tegra_das_connect_dap_to_dac(int dap, int dac) +{ + u32 addr; + u32 reg; + + if (!das) + return -ENODEV; + + addr = TEGRA_DAS_DAP_CTRL_SEL + + (dap * TEGRA_DAS_DAP_CTRL_SEL_STRIDE); + reg = dac << TEGRA_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_P; + + tegra_das_write(addr, reg); + + return 0; +} +EXPORT_SYMBOL_GPL(tegra_das_connect_dap_to_dac); + +int tegra_das_connect_dap_to_dap(int dap, int otherdap, int master, + int sdata1rx, int sdata2rx) +{ + u32 addr; + u32 reg; + + if (!das) + return -ENODEV; + + addr = TEGRA_DAS_DAP_CTRL_SEL + + (dap * TEGRA_DAS_DAP_CTRL_SEL_STRIDE); + reg = otherdap << TEGRA_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_P | + !!sdata2rx << TEGRA_DAS_DAP_CTRL_SEL_DAP_SDATA2_TX_RX_P | + !!sdata1rx << TEGRA_DAS_DAP_CTRL_SEL_DAP_SDATA1_TX_RX_P | + !!master << TEGRA_DAS_DAP_CTRL_SEL_DAP_MS_SEL_P; + + tegra_das_write(addr, reg); + + return 0; +} +EXPORT_SYMBOL_GPL(tegra_das_connect_dap_to_dap); + +int tegra_das_connect_dac_to_dap(int dac, int dap) +{ + u32 addr; + u32 reg; + + if (!das) + return -ENODEV; + + addr = TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL + + (dac * TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_STRIDE); + reg = dap << TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_CLK_SEL_P | + dap << TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA1_SEL_P | + dap << TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA2_SEL_P; + + tegra_das_write(addr, reg); + + return 0; +} +EXPORT_SYMBOL_GPL(tegra_das_connect_dac_to_dap); + +#ifdef CONFIG_DEBUG_FS +static int tegra_das_show(struct seq_file *s, void *unused) +{ + int i; + u32 addr; + u32 reg; + + for (i = 0; i < TEGRA_DAS_DAP_CTRL_SEL_COUNT; i++) { + addr = TEGRA_DAS_DAP_CTRL_SEL + + (i * TEGRA_DAS_DAP_CTRL_SEL_STRIDE); + reg = tegra_das_read(addr); + seq_printf(s, "TEGRA_DAS_DAP_CTRL_SEL[%d] = %08x\n", i, reg); + } + + for (i = 0; i < TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_COUNT; i++) { + addr = TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL + + (i * TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_STRIDE); + reg = tegra_das_read(addr); + seq_printf(s, "TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL[%d] = %08x\n", + i, reg); + } + + return 0; +} + +static int tegra_das_debug_open(struct inode *inode, struct file *file) +{ + return single_open(file, tegra_das_show, inode->i_private); +} + +static const struct file_operations tegra_das_debug_fops = { + .open = tegra_das_debug_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static void tegra_das_debug_add(struct tegra_das *das) +{ + das->debug = debugfs_create_file(DRV_NAME, S_IRUGO, + snd_soc_debugfs_root, das, + &tegra_das_debug_fops); +} + +static void tegra_das_debug_remove(struct tegra_das *das) +{ + if (das->debug) + debugfs_remove(das->debug); +} +#else +static inline void tegra_das_debug_add(struct tegra_das *das) +{ +} + +static inline void tegra_das_debug_remove(struct tegra_das *das) +{ +} +#endif + +static int __devinit tegra_das_probe(struct platform_device *pdev) +{ + struct resource *res, *region; + int ret = 0; + + if (das) + return -ENODEV; + + das = kzalloc(sizeof(struct tegra_das), GFP_KERNEL); + if (!das) { + dev_err(&pdev->dev, "Can't allocate tegra_das\n"); + ret = -ENOMEM; + goto exit; + } + das->dev = &pdev->dev; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(&pdev->dev, "No memory resource\n"); + ret = -ENODEV; + goto err_free; + } + + region = request_mem_region(res->start, resource_size(res), + pdev->name); + if (!region) { + dev_err(&pdev->dev, "Memory region already claimed\n"); + ret = -EBUSY; + goto err_free; + } + + das->regs = ioremap(res->start, resource_size(res)); + if (!das->regs) { + dev_err(&pdev->dev, "ioremap failed\n"); + ret = -ENOMEM; + goto err_release; + } + + tegra_das_debug_add(das); + + platform_set_drvdata(pdev, das); + + return 0; + +err_release: + release_mem_region(res->start, resource_size(res)); +err_free: + kfree(das); + das = 0; +exit: + return ret; +} + +static int __devexit tegra_das_remove(struct platform_device *pdev) +{ + struct resource *res; + + if (!das) + return -ENODEV; + + platform_set_drvdata(pdev, NULL); + + tegra_das_debug_remove(das); + + iounmap(das->regs); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + release_mem_region(res->start, resource_size(res)); + + kfree(das); + das = 0; + + return 0; +} + +static struct platform_driver tegra_das_driver = { + .probe = tegra_das_probe, + .remove = __devexit_p(tegra_das_remove), + .driver = { + .name = DRV_NAME, + }, +}; + +static int __init tegra_das_modinit(void) +{ + return platform_driver_register(&tegra_das_driver); +} +module_init(tegra_das_modinit); + +static void __exit tegra_das_modexit(void) +{ + platform_driver_unregister(&tegra_das_driver); +} +module_exit(tegra_das_modexit); + +MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>"); +MODULE_DESCRIPTION("Tegra DAS driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:" DRV_NAME); |