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Linux/sound/soc/tegra/tegra20_das.c

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  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 
 45         regmap_read(das->regmap, reg, &val);
 46         return val;
 47 }
 48 
 49 int 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 }
 65 EXPORT_SYMBOL_GPL(tegra20_das_connect_dap_to_dac);
 66 
 67 int 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 }
 87 EXPORT_SYMBOL_GPL(tegra20_das_connect_dap_to_dap);
 88 
 89 int 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 }
107 EXPORT_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 
113 static 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 
125 static 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 
135 static 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 
196 err:
197         das = NULL;
198         return ret;
199 }
200 
201 static 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 
211 static const struct of_device_id tegra20_das_of_match[] = {
212         { .compatible = "nvidia,tegra20-das", },
213         {},
214 };
215 
216 static 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 };
224 module_platform_driver(tegra20_das_driver);
225 
226 MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
227 MODULE_DESCRIPTION("Tegra20 DAS driver");
228 MODULE_LICENSE("GPL");
229 MODULE_ALIAS("platform:" DRV_NAME);
230 MODULE_DEVICE_TABLE(of, tegra20_das_of_match);
231 

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