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/*
* tegra20_das.c - Tegra20 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/device.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <sound/soc.h>
#include "tegra20_das.h"
#define DRV_NAME "tegra20-das"
static struct tegra20_das *das;
static inline void tegra20_das_write(u32 reg, u32 val)
{
regmap_write(das->regmap, reg, val);
}
static inline u32 tegra20_das_read(u32 reg)
{
u32 val;
regmap_read(das->regmap, reg, &val);
return val;
}
int tegra20_das_connect_dap_to_dac(int dap, int dac)
{
u32 addr;
u32 reg;
if (!das)
return -ENODEV;
addr = TEGRA20_DAS_DAP_CTRL_SEL +
(dap * TEGRA20_DAS_DAP_CTRL_SEL_STRIDE);
reg = dac << TEGRA20_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_P;
tegra20_das_write(addr, reg);
return 0;
}
EXPORT_SYMBOL_GPL(tegra20_das_connect_dap_to_dac);
int tegra20_das_connect_dap_to_dap(int dap, int otherdap, int master,
int sdata1rx, int sdata2rx)
{
u32 addr;
u32 reg;
if (!das)
return -ENODEV;
addr = TEGRA20_DAS_DAP_CTRL_SEL +
(dap * TEGRA20_DAS_DAP_CTRL_SEL_STRIDE);
reg = otherdap << TEGRA20_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_P |
!!sdata2rx << TEGRA20_DAS_DAP_CTRL_SEL_DAP_SDATA2_TX_RX_P |
!!sdata1rx << TEGRA20_DAS_DAP_CTRL_SEL_DAP_SDATA1_TX_RX_P |
!!master << TEGRA20_DAS_DAP_CTRL_SEL_DAP_MS_SEL_P;
tegra20_das_write(addr, reg);
return 0;
}
EXPORT_SYMBOL_GPL(tegra20_das_connect_dap_to_dap);
int tegra20_das_connect_dac_to_dap(int dac, int dap)
{
u32 addr;
u32 reg;
if (!das)
return -ENODEV;
addr = TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL +
(dac * TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_STRIDE);
reg = dap << TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_CLK_SEL_P |
dap << TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA1_SEL_P |
dap << TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA2_SEL_P;
tegra20_das_write(addr, reg);
return 0;
}
EXPORT_SYMBOL_GPL(tegra20_das_connect_dac_to_dap);
#define LAST_REG(name) \
(TEGRA20_DAS_##name + \
(TEGRA20_DAS_##name##_STRIDE * (TEGRA20_DAS_##name##_COUNT - 1)))
static bool tegra20_das_wr_rd_reg(struct device *dev, unsigned int reg)
{
if ((reg >= TEGRA20_DAS_DAP_CTRL_SEL) &&
(reg <= LAST_REG(DAP_CTRL_SEL)))
return true;
if ((reg >= TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL) &&
(reg <= LAST_REG(DAC_INPUT_DATA_CLK_SEL)))
return true;
return false;
}
static const struct regmap_config tegra20_das_regmap_config = {
.reg_bits = 32,
.reg_stride = 4,
.val_bits = 32,
.max_register = LAST_REG(DAC_INPUT_DATA_CLK_SEL),
.writeable_reg = tegra20_das_wr_rd_reg,
.readable_reg = tegra20_das_wr_rd_reg,
.cache_type = REGCACHE_RBTREE,
};
static int tegra20_das_probe(struct platform_device *pdev)
{
struct resource *res, *region;
void __iomem *regs;
int ret = 0;
if (das)
return -ENODEV;
das = devm_kzalloc(&pdev->dev, sizeof(struct tegra20_das), GFP_KERNEL);
if (!das) {
dev_err(&pdev->dev, "Can't allocate tegra20_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;
}
regs = devm_ioremap(&pdev->dev, res->start, resource_size(res));
if (!regs) {
dev_err(&pdev->dev, "ioremap failed\n");
ret = -ENOMEM;
goto err;
}
das->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
&tegra20_das_regmap_config);
if (IS_ERR(das->regmap)) {
dev_err(&pdev->dev, "regmap init failed\n");
ret = PTR_ERR(das->regmap);
goto err;
}
ret = tegra20_das_connect_dap_to_dac(TEGRA20_DAS_DAP_ID_1,
TEGRA20_DAS_DAP_SEL_DAC1);
if (ret) {
dev_err(&pdev->dev, "Can't set up DAS DAP connection\n");
goto err;
}
ret = tegra20_das_connect_dac_to_dap(TEGRA20_DAS_DAC_ID_1,
TEGRA20_DAS_DAC_SEL_DAP1);
if (ret) {
dev_err(&pdev->dev, "Can't set up DAS DAC connection\n");
goto err;
}
platform_set_drvdata(pdev, das);
return 0;
err:
das = NULL;
return ret;
}
static int tegra20_das_remove(struct platform_device *pdev)
{
if (!das)
return -ENODEV;
das = NULL;
return 0;
}
static const struct of_device_id tegra20_das_of_match[] = {
{ .compatible = "nvidia,tegra20-das", },
{},
};
static struct platform_driver tegra20_das_driver = {
.probe = tegra20_das_probe,
.remove = tegra20_das_remove,
.driver = {
.name = DRV_NAME,
.owner = THIS_MODULE,
.of_match_table = tegra20_das_of_match,
},
};
module_platform_driver(tegra20_das_driver);
MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
MODULE_DESCRIPTION("Tegra20 DAS driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DRV_NAME);
MODULE_DEVICE_TABLE(of, tegra20_das_of_match);
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