ASoC: tegra: Add tegra-das driver

/*

 * 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");

/*

 * tegra_das.h - Definitions for 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

 *

 */

#ifndef __TEGRA_DAS_H__

#define __TEGRA_DAS_H__

/* Register TEGRA_DAS_DAP_CTRL_SEL */

#define TEGRA_DAS_DAP_CTRL_SEL				0x00

#define TEGRA_DAS_DAP_CTRL_SEL_COUNT			5

#define TEGRA_DAS_DAP_CTRL_SEL_STRIDE			4

#define TEGRA_DAS_DAP_CTRL_SEL_DAP_MS_SEL_P		31

#define TEGRA_DAS_DAP_CTRL_SEL_DAP_MS_SEL_S		1

#define TEGRA_DAS_DAP_CTRL_SEL_DAP_SDATA1_TX_RX_P	30

#define TEGRA_DAS_DAP_CTRL_SEL_DAP_SDATA1_TX_RX_S	1

#define TEGRA_DAS_DAP_CTRL_SEL_DAP_SDATA2_TX_RX_P	29

#define TEGRA_DAS_DAP_CTRL_SEL_DAP_SDATA2_TX_RX_S	1

#define TEGRA_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_P		0

#define TEGRA_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_S		5

/* Values for field TEGRA_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL */

#define TEGRA_DAS_DAP_SEL_DAC1	0

#define TEGRA_DAS_DAP_SEL_DAC2	1

#define TEGRA_DAS_DAP_SEL_DAC3	2

#define TEGRA_DAS_DAP_SEL_DAP1	16

#define TEGRA_DAS_DAP_SEL_DAP2	17

#define TEGRA_DAS_DAP_SEL_DAP3	18

#define TEGRA_DAS_DAP_SEL_DAP4	19

#define TEGRA_DAS_DAP_SEL_DAP5	20

/* Register TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL */

#define TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL			0x40

#define TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_COUNT			3

#define TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_STRIDE			4

#define TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA2_SEL_P	28

#define TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA2_SEL_S	4

#define TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA1_SEL_P	24

#define TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA1_SEL_S	4

#define TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_CLK_SEL_P		0

#define TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_CLK_SEL_S		4

/*

 * Values for:

 * TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA2_SEL

 * TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA1_SEL

 * TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_CLK_SEL

 */

#define TEGRA_DAS_DAC_SEL_DAP1	0

#define TEGRA_DAS_DAC_SEL_DAP2	1

#define TEGRA_DAS_DAC_SEL_DAP3	2

#define TEGRA_DAS_DAC_SEL_DAP4	3

#define TEGRA_DAS_DAC_SEL_DAP5	4

/*

 * Names/IDs of the DACs/DAPs.

 */

#define TEGRA_DAS_DAP_ID_1 0

#define TEGRA_DAS_DAP_ID_2 1

#define TEGRA_DAS_DAP_ID_3 2

#define TEGRA_DAS_DAP_ID_4 3

#define TEGRA_DAS_DAP_ID_5 4

#define TEGRA_DAS_DAC_ID_1 0

#define TEGRA_DAS_DAC_ID_2 1

#define TEGRA_DAS_DAC_ID_3 2

struct tegra_das {

	struct device *dev;

	void __iomem *regs;

	struct dentry *debug;

};

/*

 * Terminology:

 * DAS: Digital audio switch (HW module controlled by this driver)

 * DAP: Digital audio port (port/pins on Tegra device)

 * DAC: Digital audio controller (e.g. I2S or AC97 controller elsewhere)

 * 

 * The Tegra DAS is a mux/cross-bar which can connect each DAP to a specific

 * DAC, or another DAP. When DAPs are connected, one must be the master and

 * one the slave. Each DAC allows selection of a specific DAP for input, to

 * cater for the case where N DAPs are connected to 1 DAC for broadcast

 * output.

 *

 * This driver is dumb; no attempt is made to ensure that a valid routing

 * configuration is programmed.

 */

/*

 * Connect a DAP to to a DAC

 * dap_id: DAP to connect: TEGRA_DAS_DAP_ID_*

 * dac_sel: DAC to connect to: TEGRA_DAS_DAP_SEL_DAC*

 */

extern int tegra_das_connect_dap_to_dac(int dap_id, int dac_sel);

/*

 * Connect a DAP to to another DAP

 * dap_id: DAP to connect: TEGRA_DAS_DAP_ID_*

 * other_dap_sel: DAP to connect to: TEGRA_DAS_DAP_SEL_DAP*

 * master: Is this DAP the master (1) or slave (0)

 * sdata1rx: Is this DAP's SDATA1 pin RX (1) or TX (0)

 * sdata2rx: Is this DAP's SDATA2 pin RX (1) or TX (0)

 */

extern int tegra_das_connect_dap_to_dap(int dap_id, int other_dap_sel,

					int master, int sdata1rx,

					int sdata2rx);

/*

 * Connect a DAC's input to a DAP

 * (DAC outputs are selected by the DAP)

 * dac_id: DAC ID to connect: TEGRA_DAS_DAC_ID_*

 * dap_sel: DAP to receive input from: TEGRA_DAS_DAC_SEL_DAP*

 */

extern int tegra_das_connect_dac_to_dap(int dac_id, int dap_sel);

#endif