1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
|
/*
* 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 __devinit 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 __devexit 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 = __devexit_p(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);
|
