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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * tegra20_das.c - Tegra20 DAS driver
4 *
5 * Author: Stephen Warren <swarren@nvidia.com>
6 * Copyright (C) 2010 - NVIDIA, Inc.
7 */
8
9#include <linux/device.h>
10#include <linux/io.h>
11#include <linux/module.h>
12#include <linux/platform_device.h>
13#include <linux/regmap.h>
14#include <linux/slab.h>
15#include <sound/soc.h>
16
17#define DRV_NAME "tegra20-das"
18
19/* Register TEGRA20_DAS_DAP_CTRL_SEL */
20#define TEGRA20_DAS_DAP_CTRL_SEL 0x00
21#define TEGRA20_DAS_DAP_CTRL_SEL_COUNT 5
22#define TEGRA20_DAS_DAP_CTRL_SEL_STRIDE 4
23#define TEGRA20_DAS_DAP_CTRL_SEL_DAP_MS_SEL_P 31
24#define TEGRA20_DAS_DAP_CTRL_SEL_DAP_MS_SEL_S 1
25#define TEGRA20_DAS_DAP_CTRL_SEL_DAP_SDATA1_TX_RX_P 30
26#define TEGRA20_DAS_DAP_CTRL_SEL_DAP_SDATA1_TX_RX_S 1
27#define TEGRA20_DAS_DAP_CTRL_SEL_DAP_SDATA2_TX_RX_P 29
28#define TEGRA20_DAS_DAP_CTRL_SEL_DAP_SDATA2_TX_RX_S 1
29#define TEGRA20_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_P 0
30#define TEGRA20_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_S 5
31
32/* Values for field TEGRA20_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL */
33#define TEGRA20_DAS_DAP_SEL_DAC1 0
34#define TEGRA20_DAS_DAP_SEL_DAC2 1
35#define TEGRA20_DAS_DAP_SEL_DAC3 2
36#define TEGRA20_DAS_DAP_SEL_DAP1 16
37#define TEGRA20_DAS_DAP_SEL_DAP2 17
38#define TEGRA20_DAS_DAP_SEL_DAP3 18
39#define TEGRA20_DAS_DAP_SEL_DAP4 19
40#define TEGRA20_DAS_DAP_SEL_DAP5 20
41
42/* Register TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL */
43#define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL 0x40
44#define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_COUNT 3
45#define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_STRIDE 4
46#define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA2_SEL_P 28
47#define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA2_SEL_S 4
48#define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA1_SEL_P 24
49#define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA1_SEL_S 4
50#define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_CLK_SEL_P 0
51#define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_CLK_SEL_S 4
52
53/*
54 * Values for:
55 * TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA2_SEL
56 * TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA1_SEL
57 * TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_CLK_SEL
58 */
59#define TEGRA20_DAS_DAC_SEL_DAP1 0
60#define TEGRA20_DAS_DAC_SEL_DAP2 1
61#define TEGRA20_DAS_DAC_SEL_DAP3 2
62#define TEGRA20_DAS_DAC_SEL_DAP4 3
63#define TEGRA20_DAS_DAC_SEL_DAP5 4
64
65/*
66 * Names/IDs of the DACs/DAPs.
67 */
68
69#define TEGRA20_DAS_DAP_ID_1 0
70#define TEGRA20_DAS_DAP_ID_2 1
71#define TEGRA20_DAS_DAP_ID_3 2
72#define TEGRA20_DAS_DAP_ID_4 3
73#define TEGRA20_DAS_DAP_ID_5 4
74
75#define TEGRA20_DAS_DAC_ID_1 0
76#define TEGRA20_DAS_DAC_ID_2 1
77#define TEGRA20_DAS_DAC_ID_3 2
78
79struct tegra20_das {
80 struct regmap *regmap;
81};
82
83/*
84 * Terminology:
85 * DAS: Digital audio switch (HW module controlled by this driver)
86 * DAP: Digital audio port (port/pins on Tegra device)
87 * DAC: Digital audio controller (e.g. I2S or AC97 controller elsewhere)
88 *
89 * The Tegra DAS is a mux/cross-bar which can connect each DAP to a specific
90 * DAC, or another DAP. When DAPs are connected, one must be the master and
91 * one the slave. Each DAC allows selection of a specific DAP for input, to
92 * cater for the case where N DAPs are connected to 1 DAC for broadcast
93 * output.
94 *
95 * This driver is dumb; no attempt is made to ensure that a valid routing
96 * configuration is programmed.
97 */
98
99static inline void tegra20_das_write(struct tegra20_das *das, u32 reg, u32 val)
100{
101 regmap_write(das->regmap, reg, val);
102}
103
104static void tegra20_das_connect_dap_to_dac(struct tegra20_das *das, int dap, int dac)
105{
106 u32 addr;
107 u32 reg;
108
109 addr = TEGRA20_DAS_DAP_CTRL_SEL +
110 (dap * TEGRA20_DAS_DAP_CTRL_SEL_STRIDE);
111 reg = dac << TEGRA20_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_P;
112
113 tegra20_das_write(das, addr, reg);
114}
115
116static void tegra20_das_connect_dac_to_dap(struct tegra20_das *das, int dac, int dap)
117{
118 u32 addr;
119 u32 reg;
120
121 addr = TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL +
122 (dac * TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_STRIDE);
123 reg = dap << TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_CLK_SEL_P |
124 dap << TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA1_SEL_P |
125 dap << TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA2_SEL_P;
126
127 tegra20_das_write(das, addr, reg);
128}
129
130#define LAST_REG(name) \
131 (TEGRA20_DAS_##name + \
132 (TEGRA20_DAS_##name##_STRIDE * (TEGRA20_DAS_##name##_COUNT - 1)))
133
134static bool tegra20_das_wr_rd_reg(struct device *dev, unsigned int reg)
135{
136 if (reg <= LAST_REG(DAP_CTRL_SEL))
137 return true;
138 if ((reg >= TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL) &&
139 (reg <= LAST_REG(DAC_INPUT_DATA_CLK_SEL)))
140 return true;
141
142 return false;
143}
144
145static const struct regmap_config tegra20_das_regmap_config = {
146 .reg_bits = 32,
147 .reg_stride = 4,
148 .val_bits = 32,
149 .max_register = LAST_REG(DAC_INPUT_DATA_CLK_SEL),
150 .writeable_reg = tegra20_das_wr_rd_reg,
151 .readable_reg = tegra20_das_wr_rd_reg,
152 .cache_type = REGCACHE_FLAT,
153};
154
155static int tegra20_das_probe(struct platform_device *pdev)
156{
157 void __iomem *regs;
158 struct tegra20_das *das;
159
160 das = devm_kzalloc(&pdev->dev, sizeof(struct tegra20_das), GFP_KERNEL);
161 if (!das)
162 return -ENOMEM;
163
164 regs = devm_platform_ioremap_resource(pdev, 0);
165 if (IS_ERR(regs))
166 return PTR_ERR(regs);
167
168 das->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
169 &tegra20_das_regmap_config);
170 if (IS_ERR(das->regmap)) {
171 dev_err(&pdev->dev, "regmap init failed\n");
172 return PTR_ERR(das->regmap);
173 }
174
175 tegra20_das_connect_dap_to_dac(das, TEGRA20_DAS_DAP_ID_1,
176 TEGRA20_DAS_DAP_SEL_DAC1);
177 tegra20_das_connect_dac_to_dap(das, TEGRA20_DAS_DAC_ID_1,
178 TEGRA20_DAS_DAC_SEL_DAP1);
179 tegra20_das_connect_dap_to_dac(das, TEGRA20_DAS_DAP_ID_3,
180 TEGRA20_DAS_DAP_SEL_DAC3);
181 tegra20_das_connect_dac_to_dap(das, TEGRA20_DAS_DAC_ID_3,
182 TEGRA20_DAS_DAC_SEL_DAP3);
183
184 return 0;
185}
186
187static const struct of_device_id tegra20_das_of_match[] = {
188 { .compatible = "nvidia,tegra20-das", },
189 {},
190};
191
192static struct platform_driver tegra20_das_driver = {
193 .probe = tegra20_das_probe,
194 .driver = {
195 .name = DRV_NAME,
196 .of_match_table = tegra20_das_of_match,
197 },
198};
199module_platform_driver(tegra20_das_driver);
200
201MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
202MODULE_DESCRIPTION("Tegra20 DAS driver");
203MODULE_LICENSE("GPL");
204MODULE_ALIAS("platform:" DRV_NAME);
205MODULE_DEVICE_TABLE(of, tegra20_das_of_match);
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
45 regmap_read(das->regmap, reg, &val);
46 return val;
47}
48
49int tegra20_das_connect_dap_to_dac(int dap, int dac)
50{
51 u32 addr;
52 u32 reg;
53
54 if (!das)
55 return -ENODEV;
56
57 addr = TEGRA20_DAS_DAP_CTRL_SEL +
58 (dap * TEGRA20_DAS_DAP_CTRL_SEL_STRIDE);
59 reg = dac << TEGRA20_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_P;
60
61 tegra20_das_write(addr, reg);
62
63 return 0;
64}
65EXPORT_SYMBOL_GPL(tegra20_das_connect_dap_to_dac);
66
67int tegra20_das_connect_dap_to_dap(int dap, int otherdap, int master,
68 int sdata1rx, int sdata2rx)
69{
70 u32 addr;
71 u32 reg;
72
73 if (!das)
74 return -ENODEV;
75
76 addr = TEGRA20_DAS_DAP_CTRL_SEL +
77 (dap * TEGRA20_DAS_DAP_CTRL_SEL_STRIDE);
78 reg = otherdap << TEGRA20_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_P |
79 !!sdata2rx << TEGRA20_DAS_DAP_CTRL_SEL_DAP_SDATA2_TX_RX_P |
80 !!sdata1rx << TEGRA20_DAS_DAP_CTRL_SEL_DAP_SDATA1_TX_RX_P |
81 !!master << TEGRA20_DAS_DAP_CTRL_SEL_DAP_MS_SEL_P;
82
83 tegra20_das_write(addr, reg);
84
85 return 0;
86}
87EXPORT_SYMBOL_GPL(tegra20_das_connect_dap_to_dap);
88
89int tegra20_das_connect_dac_to_dap(int dac, int dap)
90{
91 u32 addr;
92 u32 reg;
93
94 if (!das)
95 return -ENODEV;
96
97 addr = TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL +
98 (dac * TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_STRIDE);
99 reg = dap << TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_CLK_SEL_P |
100 dap << TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA1_SEL_P |
101 dap << TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA2_SEL_P;
102
103 tegra20_das_write(addr, reg);
104
105 return 0;
106}
107EXPORT_SYMBOL_GPL(tegra20_das_connect_dac_to_dap);
108
109#define LAST_REG(name) \
110 (TEGRA20_DAS_##name + \
111 (TEGRA20_DAS_##name##_STRIDE * (TEGRA20_DAS_##name##_COUNT - 1)))
112
113static bool tegra20_das_wr_rd_reg(struct device *dev, unsigned int reg)
114{
115 if ((reg >= TEGRA20_DAS_DAP_CTRL_SEL) &&
116 (reg <= LAST_REG(DAP_CTRL_SEL)))
117 return true;
118 if ((reg >= TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL) &&
119 (reg <= LAST_REG(DAC_INPUT_DATA_CLK_SEL)))
120 return true;
121
122 return false;
123}
124
125static const struct regmap_config tegra20_das_regmap_config = {
126 .reg_bits = 32,
127 .reg_stride = 4,
128 .val_bits = 32,
129 .max_register = LAST_REG(DAC_INPUT_DATA_CLK_SEL),
130 .writeable_reg = tegra20_das_wr_rd_reg,
131 .readable_reg = tegra20_das_wr_rd_reg,
132 .cache_type = REGCACHE_FLAT,
133};
134
135static int tegra20_das_probe(struct platform_device *pdev)
136{
137 struct resource *res;
138 void __iomem *regs;
139 int ret = 0;
140
141 if (das)
142 return -ENODEV;
143
144 das = devm_kzalloc(&pdev->dev, sizeof(struct tegra20_das), GFP_KERNEL);
145 if (!das) {
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);