https://github.com/torvalds/linux
Tip revision: c16fa4f2ad19908a47c63d8fa436a1178438c7e7 authored by Linus Torvalds on 18 March 2012, 23:15:34 UTC
Linux 3.3
Linux 3.3
Tip revision: c16fa4f
tegra_das.c
/*
* 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 = 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 <swarren@nvidia.com>");
MODULE_DESCRIPTION("Tegra DAS driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DRV_NAME);
MODULE_DEVICE_TABLE(of, tegra_das_of_match);