| /* |
| * 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, asoc_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"); |