/* * tegra20_das.c - Tegra20 DAS driver * * Author: Stephen Warren * 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 #include #include #include #include #include #include #include #include #include "tegra20_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 = devm_kzalloc(&pdev->dev, sizeof(struct tegra_das), GFP_KERNEL); if (!das) { dev_err(&pdev->dev, "Can't allocate tegra_das\n"); ret = -ENOMEM; goto err; } 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; } region = devm_request_mem_region(&pdev->dev, res->start, resource_size(res), pdev->name); if (!region) { dev_err(&pdev->dev, "Memory region already claimed\n"); ret = -EBUSY; goto err; } das->regs = devm_ioremap(&pdev->dev, res->start, resource_size(res)); if (!das->regs) { dev_err(&pdev->dev, "ioremap failed\n"); ret = -ENOMEM; goto err; } ret = tegra_das_connect_dap_to_dac(TEGRA_DAS_DAP_ID_1, TEGRA_DAS_DAP_SEL_DAC1); if (ret) { dev_err(&pdev->dev, "Can't set up DAS DAP connection\n"); goto err; } ret = tegra_das_connect_dac_to_dap(TEGRA_DAS_DAC_ID_1, TEGRA_DAS_DAC_SEL_DAP1); if (ret) { dev_err(&pdev->dev, "Can't set up DAS DAC connection\n"); goto err; } tegra_das_debug_add(das); platform_set_drvdata(pdev, das); return 0; err: das = NULL; return ret; } static int __devexit tegra_das_remove(struct platform_device *pdev) { if (!das) return -ENODEV; tegra_das_debug_remove(das); das = NULL; return 0; } static const struct of_device_id tegra_das_of_match[] __devinitconst = { { .compatible = "nvidia,tegra20-das", }, {}, }; static struct platform_driver tegra_das_driver = { .probe = tegra_das_probe, .remove = __devexit_p(tegra_das_remove), .driver = { .name = DRV_NAME, .owner = THIS_MODULE, .of_match_table = tegra_das_of_match, }, }; module_platform_driver(tegra_das_driver); MODULE_AUTHOR("Stephen Warren "); MODULE_DESCRIPTION("Tegra DAS driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:" DRV_NAME); MODULE_DEVICE_TABLE(of, tegra_das_of_match);