xref: /openbmc/linux/sound/soc/tegra/tegra20_das.c (revision 12eb4683)
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 
34 static struct tegra20_das *das;
35 
36 static inline void tegra20_das_write(u32 reg, u32 val)
37 {
38 	regmap_write(das->regmap, reg, val);
39 }
40 
41 static inline u32 tegra20_das_read(u32 reg)
42 {
43 	u32 val;
44 	regmap_read(das->regmap, reg, &val);
45 	return val;
46 }
47 
48 int 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 }
64 EXPORT_SYMBOL_GPL(tegra20_das_connect_dap_to_dac);
65 
66 int 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 }
86 EXPORT_SYMBOL_GPL(tegra20_das_connect_dap_to_dap);
87 
88 int 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 }
106 EXPORT_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 
112 static 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 
124 static 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_RBTREE,
132 };
133 
134 static int tegra20_das_probe(struct platform_device *pdev)
135 {
136 	struct resource *res, *region;
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 	if (!res) {
153 		dev_err(&pdev->dev, "No memory resource\n");
154 		ret = -ENODEV;
155 		goto err;
156 	}
157 
158 	region = devm_request_mem_region(&pdev->dev, res->start,
159 					 resource_size(res), pdev->name);
160 	if (!region) {
161 		dev_err(&pdev->dev, "Memory region already claimed\n");
162 		ret = -EBUSY;
163 		goto err;
164 	}
165 
166 	regs = devm_ioremap(&pdev->dev, res->start, resource_size(res));
167 	if (!regs) {
168 		dev_err(&pdev->dev, "ioremap failed\n");
169 		ret = -ENOMEM;
170 		goto err;
171 	}
172 
173 	das->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
174 					    &tegra20_das_regmap_config);
175 	if (IS_ERR(das->regmap)) {
176 		dev_err(&pdev->dev, "regmap init failed\n");
177 		ret = PTR_ERR(das->regmap);
178 		goto err;
179 	}
180 
181 	ret = tegra20_das_connect_dap_to_dac(TEGRA20_DAS_DAP_ID_1,
182 					     TEGRA20_DAS_DAP_SEL_DAC1);
183 	if (ret) {
184 		dev_err(&pdev->dev, "Can't set up DAS DAP connection\n");
185 		goto err;
186 	}
187 	ret = tegra20_das_connect_dac_to_dap(TEGRA20_DAS_DAC_ID_1,
188 					     TEGRA20_DAS_DAC_SEL_DAP1);
189 	if (ret) {
190 		dev_err(&pdev->dev, "Can't set up DAS DAC connection\n");
191 		goto err;
192 	}
193 
194 	ret = tegra20_das_connect_dap_to_dac(TEGRA20_DAS_DAP_ID_3,
195 					     TEGRA20_DAS_DAP_SEL_DAC3);
196 	if (ret) {
197 		dev_err(&pdev->dev, "Can't set up DAS DAP connection\n");
198 		goto err;
199 	}
200 	ret = tegra20_das_connect_dac_to_dap(TEGRA20_DAS_DAC_ID_3,
201 					     TEGRA20_DAS_DAC_SEL_DAP3);
202 	if (ret) {
203 		dev_err(&pdev->dev, "Can't set up DAS DAC connection\n");
204 		goto err;
205 	}
206 
207 	platform_set_drvdata(pdev, das);
208 
209 	return 0;
210 
211 err:
212 	das = NULL;
213 	return ret;
214 }
215 
216 static int tegra20_das_remove(struct platform_device *pdev)
217 {
218 	if (!das)
219 		return -ENODEV;
220 
221 	das = NULL;
222 
223 	return 0;
224 }
225 
226 static const struct of_device_id tegra20_das_of_match[] = {
227 	{ .compatible = "nvidia,tegra20-das", },
228 	{},
229 };
230 
231 static struct platform_driver tegra20_das_driver = {
232 	.probe = tegra20_das_probe,
233 	.remove = tegra20_das_remove,
234 	.driver = {
235 		.name = DRV_NAME,
236 		.owner = THIS_MODULE,
237 		.of_match_table = tegra20_das_of_match,
238 	},
239 };
240 module_platform_driver(tegra20_das_driver);
241 
242 MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
243 MODULE_DESCRIPTION("Tegra20 DAS driver");
244 MODULE_LICENSE("GPL");
245 MODULE_ALIAS("platform:" DRV_NAME);
246 MODULE_DEVICE_TABLE(of, tegra20_das_of_match);
247