[deliverable/linux.git] / sound / soc / tegra / tegra20_das.c

/*
 * 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/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 "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 <swarren@nvidia.com>");
MODULE_DESCRIPTION("Tegra DAS driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DRV_NAME);
MODULE_DEVICE_TABLE(of, tegra_das_of_match);
Commit	Line	Data
f0d8af4f	1	/*
ef280d39	2	* tegra20_das.c - Tegra20 DAS driver
f0d8af4f SW	3	*
	4	* Author: Stephen Warren <swarren@nvidia.com>
	5	* Copyright (C) 2010 - NVIDIA, Inc.
	6	*
	7	* This program is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU General Public License
	9	* version 2 as published by the Free Software Foundation.
	10	*
	11	* This program is distributed in the hope that it will be useful, but
	12	* WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	* General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
	19	* 02110-1301 USA
	20	*
	21	*/
	22
	23	#include <linux/module.h>
	24	#include <linux/debugfs.h>
	25	#include <linux/device.h>
	26	#include <linux/platform_device.h>
	27	#include <linux/seq_file.h>
	28	#include <linux/slab.h>
	29	#include <linux/io.h>
	30	#include <mach/iomap.h>
	31	#include <sound/soc.h>
ef280d39	32	#include "tegra20_das.h"
f0d8af4f SW	33
	34	#define DRV_NAME "tegra-das"
	35
	36	static struct tegra_das *das;
	37
	38	static inline void tegra_das_write(u32 reg, u32 val)
	39	{
	40	__raw_writel(val, das->regs + reg);
	41	}
	42
	43	static inline u32 tegra_das_read(u32 reg)
	44	{
	45	return __raw_readl(das->regs + reg);
	46	}
	47
	48	int tegra_das_connect_dap_to_dac(int dap, int dac)
	49	{
	50	u32 addr;
	51	u32 reg;
	52
	53	if (!das)
	54	return -ENODEV;
	55
	56	addr = TEGRA_DAS_DAP_CTRL_SEL +
	57	(dap * TEGRA_DAS_DAP_CTRL_SEL_STRIDE);
	58	reg = dac << TEGRA_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_P;
	59
	60	tegra_das_write(addr, reg);
	61
	62	return 0;
	63	}
	64	EXPORT_SYMBOL_GPL(tegra_das_connect_dap_to_dac);
	65
	66	int tegra_das_connect_dap_to_dap(int dap, int otherdap, int master,
	67	int sdata1rx, int sdata2rx)
	68	{
	69	u32 addr;
	70	u32 reg;
	71
	72	if (!das)
	73	return -ENODEV;
	74
	75	addr = TEGRA_DAS_DAP_CTRL_SEL +
	76	(dap * TEGRA_DAS_DAP_CTRL_SEL_STRIDE);
	77	reg = otherdap << TEGRA_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_P \|
	78	!!sdata2rx << TEGRA_DAS_DAP_CTRL_SEL_DAP_SDATA2_TX_RX_P \|
	79	!!sdata1rx << TEGRA_DAS_DAP_CTRL_SEL_DAP_SDATA1_TX_RX_P \|
	80	!!master << TEGRA_DAS_DAP_CTRL_SEL_DAP_MS_SEL_P;
	81
	82	tegra_das_write(addr, reg);
	83
	84	return 0;
	85	}
	86	EXPORT_SYMBOL_GPL(tegra_das_connect_dap_to_dap);
	87
	88	int tegra_das_connect_dac_to_dap(int dac, int dap)
	89	{
	90	u32 addr;
	91	u32 reg;
	92
	93	if (!das)
	94	return -ENODEV;
	95
	96	addr = TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL +
97	(dac * TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_STRIDE);
98	reg = dap << TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_CLK_SEL_P \|
99	dap << TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA1_SEL_P \|
100	dap << TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA2_SEL_P;
101
102	tegra_das_write(addr, reg);
103
104	return 0;
105	}
106	EXPORT_SYMBOL_GPL(tegra_das_connect_dac_to_dap);
107
108	#ifdef CONFIG_DEBUG_FS
109	static int tegra_das_show(struct seq_file s, void unused)
110	{
111	int i;
112	u32 addr;
113	u32 reg;
114
115	for (i = 0; i < TEGRA_DAS_DAP_CTRL_SEL_COUNT; i++) {
116	addr = TEGRA_DAS_DAP_CTRL_SEL +
117	(i * TEGRA_DAS_DAP_CTRL_SEL_STRIDE);
118	reg = tegra_das_read(addr);
119	seq_printf(s, "TEGRA_DAS_DAP_CTRL_SEL[%d] = %08x\n", i, reg);
120	}
121
122	for (i = 0; i < TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_COUNT; i++) {
123	addr = TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL +
124	(i * TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_STRIDE);
125	reg = tegra_das_read(addr);
126	seq_printf(s, "TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL[%d] = %08x\n",
127	i, reg);
128	}
129
130	return 0;
131	}
132
133	static int tegra_das_debug_open(struct inode inode, struct file file)
134	{
135	return single_open(file, tegra_das_show, inode->i_private);
136	}
137
138	static const struct file_operations tegra_das_debug_fops = {
139	.open = tegra_das_debug_open,
140	.read = seq_read,
141	.llseek = seq_lseek,
142	.release = single_release,
143	};
144
145	static void tegra_das_debug_add(struct tegra_das *das)
146	{
8a9dab1a MB	147	das->debug = debugfs_create_file(DRV_NAME, S_IRUGO,
	148	snd_soc_debugfs_root, das,
	149	&tegra_das_debug_fops);
f0d8af4f SW	150	}
	151
	152	static void tegra_das_debug_remove(struct tegra_das *das)
	153	{
	154	if (das->debug)
	155	debugfs_remove(das->debug);
	156	}
	157	#else
	158	static inline void tegra_das_debug_add(struct tegra_das *das)
	159	{
	160	}
	161
	162	static inline void tegra_das_debug_remove(struct tegra_das *das)
	163	{
	164	}
	165	#endif
	166
	167	static int __devinit tegra_das_probe(struct platform_device *pdev)
	168	{
	169	struct resource res, region;
	170	int ret = 0;
	171
	172	if (das)
	173	return -ENODEV;
	174
f2296d7b	175	das = devm_kzalloc(&pdev->dev, sizeof(struct tegra_das), GFP_KERNEL);
f0d8af4f SW	176	if (!das) {
	177	dev_err(&pdev->dev, "Can't allocate tegra_das\n");
	178	ret = -ENOMEM;
f2296d7b	179	goto err;
f0d8af4f SW	180	}
	181	das->dev = &pdev->dev;
	182
	183	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	184	if (!res) {
	185	dev_err(&pdev->dev, "No memory resource\n");
	186	ret = -ENODEV;
f2296d7b	187	goto err;
f0d8af4f SW	188	}
f0d8af4f SW	189
f2296d7b SW	190	region = devm_request_mem_region(&pdev->dev, res->start,
f2296d7b SW	191	resource_size(res), pdev->name);
f0d8af4f SW	192	if (!region) {
	193	dev_err(&pdev->dev, "Memory region already claimed\n");
	194	ret = -EBUSY;
f2296d7b	195	goto err;
f0d8af4f SW	196	}
f0d8af4f SW	197
f2296d7b	198	das->regs = devm_ioremap(&pdev->dev, res->start, resource_size(res));
f0d8af4f SW	199	if (!das->regs) {
	200	dev_err(&pdev->dev, "ioremap failed\n");
	201	ret = -ENOMEM;
f2296d7b	202	goto err;
f0d8af4f SW	203	}
f0d8af4f SW	204
7b9b5e11 SW	205	ret = tegra_das_connect_dap_to_dac(TEGRA_DAS_DAP_ID_1,
	206	TEGRA_DAS_DAP_SEL_DAC1);
	207	if (ret) {
	208	dev_err(&pdev->dev, "Can't set up DAS DAP connection\n");
	209	goto err;
	210	}
	211	ret = tegra_das_connect_dac_to_dap(TEGRA_DAS_DAC_ID_1,
	212	TEGRA_DAS_DAC_SEL_DAP1);
	213	if (ret) {
	214	dev_err(&pdev->dev, "Can't set up DAS DAC connection\n");
	215	goto err;
	216	}
	217
f0d8af4f SW	218	tegra_das_debug_add(das);
	219
	220	platform_set_drvdata(pdev, das);
	221
	222	return 0;
	223
f2296d7b	224	err:
01840bbe	225	das = NULL;
f0d8af4f SW	226	return ret;
	227	}
	228
	229	static int __devexit tegra_das_remove(struct platform_device *pdev)
	230	{
f0d8af4f SW	231	if (!das)
	232	return -ENODEV;
	233
f0d8af4f SW	234	tegra_das_debug_remove(das);
f0d8af4f SW	235
01840bbe	236	das = NULL;
f0d8af4f SW	237
	238	return 0;
	239	}
	240
186bcda6 SW	241	static const struct of_device_id tegra_das_of_match[] __devinitconst = {
	242	{ .compatible = "nvidia,tegra20-das", },
	243	{},
	244	};
	245
f0d8af4f SW	246	static struct platform_driver tegra_das_driver = {
	247	.probe = tegra_das_probe,
	248	.remove = __devexit_p(tegra_das_remove),
	249	.driver = {
	250	.name = DRV_NAME,
186bcda6 SW	251	.owner = THIS_MODULE,
186bcda6 SW	252	.of_match_table = tegra_das_of_match,
f0d8af4f SW	253	},
f0d8af4f SW	254	};
f2296d7b	255	module_platform_driver(tegra_das_driver);
f0d8af4f SW	256
	257	MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
	258	MODULE_DESCRIPTION("Tegra DAS driver");
	259	MODULE_LICENSE("GPL");
8eb34207	260	MODULE_ALIAS("platform:" DRV_NAME);
186bcda6	261	MODULE_DEVICE_TABLE(of, tegra_das_of_match);