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