1/*
2 * tegra20_das.c - Tegra20 DAS driver
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/device.h>
24#include <linux/io.h>
25#include <linux/module.h>
26#include <linux/platform_device.h>
27#include <linux/regmap.h>
28#include <linux/slab.h>
29#include <sound/soc.h>
30#include "tegra20_das.h"
31
32#define DRV_NAME "tegra20-das"
33
34static struct tegra20_das *das;
35
36static inline void tegra20_das_write(u32 reg, u32 val)
37{
38	regmap_write(das->regmap, reg, val);
39}
40
41static inline u32 tegra20_das_read(u32 reg)
42{
43	u32 val;
44	regmap_read(das->regmap, reg, &val);
45	return val;
46}
47
48int tegra20_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 = TEGRA20_DAS_DAP_CTRL_SEL +
57		(dap * TEGRA20_DAS_DAP_CTRL_SEL_STRIDE);
58	reg = dac << TEGRA20_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_P;
59
60	tegra20_das_write(addr, reg);
61
62	return 0;
63}
64EXPORT_SYMBOL_GPL(tegra20_das_connect_dap_to_dac);
65
66int tegra20_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 = TEGRA20_DAS_DAP_CTRL_SEL +
76		(dap * TEGRA20_DAS_DAP_CTRL_SEL_STRIDE);
77	reg = otherdap << TEGRA20_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_P |
78		!!sdata2rx << TEGRA20_DAS_DAP_CTRL_SEL_DAP_SDATA2_TX_RX_P |
79		!!sdata1rx << TEGRA20_DAS_DAP_CTRL_SEL_DAP_SDATA1_TX_RX_P |
80		!!master << TEGRA20_DAS_DAP_CTRL_SEL_DAP_MS_SEL_P;
81
82	tegra20_das_write(addr, reg);
83
84	return 0;
85}
86EXPORT_SYMBOL_GPL(tegra20_das_connect_dap_to_dap);
87
88int tegra20_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 = TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL +
97		(dac * TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_STRIDE);
98	reg = dap << TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_CLK_SEL_P |
99		dap << TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA1_SEL_P |
100		dap << TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA2_SEL_P;
101
102	tegra20_das_write(addr, reg);
103
104	return 0;
105}
106EXPORT_SYMBOL_GPL(tegra20_das_connect_dac_to_dap);
107
108#define LAST_REG(name) \
109	(TEGRA20_DAS_##name + \
110	 (TEGRA20_DAS_##name##_STRIDE * (TEGRA20_DAS_##name##_COUNT - 1)))
111
112static bool tegra20_das_wr_rd_reg(struct device *dev, unsigned int reg)
113{
114	if ((reg >= TEGRA20_DAS_DAP_CTRL_SEL) &&
115	    (reg <= LAST_REG(DAP_CTRL_SEL)))
116		return true;
117	if ((reg >= TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL) &&
118	    (reg <= LAST_REG(DAC_INPUT_DATA_CLK_SEL)))
119		return true;
120
121	return false;
122}
123
124static const struct regmap_config tegra20_das_regmap_config = {
125	.reg_bits = 32,
126	.reg_stride = 4,
127	.val_bits = 32,
128	.max_register = LAST_REG(DAC_INPUT_DATA_CLK_SEL),
129	.writeable_reg = tegra20_das_wr_rd_reg,
130	.readable_reg = tegra20_das_wr_rd_reg,
131	.cache_type = REGCACHE_FLAT,
132};
133
134static int tegra20_das_probe(struct platform_device *pdev)
135{
136	struct resource *res;
137	void __iomem *regs;
138	int ret = 0;
139
140	if (das)
141		return -ENODEV;
142
143	das = devm_kzalloc(&pdev->dev, sizeof(struct tegra20_das), GFP_KERNEL);
144	if (!das) {
145		dev_err(&pdev->dev, "Can't allocate tegra20_das\n");
146		ret = -ENOMEM;
147		goto err;
148	}
149	das->dev = &pdev->dev;
150
151	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
152	regs = devm_ioremap_resource(&pdev->dev, res);
153	if (IS_ERR(regs)) {
154		ret = PTR_ERR(regs);
155		goto err;
156	}
157
158	das->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
159					    &tegra20_das_regmap_config);
160	if (IS_ERR(das->regmap)) {
161		dev_err(&pdev->dev, "regmap init failed\n");
162		ret = PTR_ERR(das->regmap);
163		goto err;
164	}
165
166	ret = tegra20_das_connect_dap_to_dac(TEGRA20_DAS_DAP_ID_1,
167					     TEGRA20_DAS_DAP_SEL_DAC1);
168	if (ret) {
169		dev_err(&pdev->dev, "Can't set up DAS DAP connection\n");
170		goto err;
171	}
172	ret = tegra20_das_connect_dac_to_dap(TEGRA20_DAS_DAC_ID_1,
173					     TEGRA20_DAS_DAC_SEL_DAP1);
174	if (ret) {
175		dev_err(&pdev->dev, "Can't set up DAS DAC connection\n");
176		goto err;
177	}
178
179	ret = tegra20_das_connect_dap_to_dac(TEGRA20_DAS_DAP_ID_3,
180					     TEGRA20_DAS_DAP_SEL_DAC3);
181	if (ret) {
182		dev_err(&pdev->dev, "Can't set up DAS DAP connection\n");
183		goto err;
184	}
185	ret = tegra20_das_connect_dac_to_dap(TEGRA20_DAS_DAC_ID_3,
186					     TEGRA20_DAS_DAC_SEL_DAP3);
187	if (ret) {
188		dev_err(&pdev->dev, "Can't set up DAS DAC connection\n");
189		goto err;
190	}
191
192	platform_set_drvdata(pdev, das);
193
194	return 0;
195
196err:
197	das = NULL;
198	return ret;
199}
200
201static int tegra20_das_remove(struct platform_device *pdev)
202{
203	if (!das)
204		return -ENODEV;
205
206	das = NULL;
207
208	return 0;
209}
210
211static const struct of_device_id tegra20_das_of_match[] = {
212	{ .compatible = "nvidia,tegra20-das", },
213	{},
214};
215
216static struct platform_driver tegra20_das_driver = {
217	.probe = tegra20_das_probe,
218	.remove = tegra20_das_remove,
219	.driver = {
220		.name = DRV_NAME,
221		.of_match_table = tegra20_das_of_match,
222	},
223};
224module_platform_driver(tegra20_das_driver);
225
226MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
227MODULE_DESCRIPTION("Tegra20 DAS driver");
228MODULE_LICENSE("GPL");
229MODULE_ALIAS("platform:" DRV_NAME);
230MODULE_DEVICE_TABLE(of, tegra20_das_of_match);
231