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Linux/sound/soc/fsl/imx-audmux.c

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  1 /*
  2  * Copyright 2012 Freescale Semiconductor, Inc.
  3  * Copyright 2012 Linaro Ltd.
  4  * Copyright 2009 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de>
  5  *
  6  * Initial development of this code was funded by
  7  * Phytec Messtechnik GmbH, http://www.phytec.de
  8  *
  9  * This program is free software; you can redistribute it and/or modify
 10  * it under the terms of the GNU General Public License as published by
 11  * the Free Software Foundation; either version 2 of the License, or
 12  * (at your option) any later version.
 13  *
 14  * This program is distributed in the hope that it will be useful,
 15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 17  * GNU General Public License for more details.
 18  */
 19 
 20 #include <linux/clk.h>
 21 #include <linux/debugfs.h>
 22 #include <linux/err.h>
 23 #include <linux/io.h>
 24 #include <linux/module.h>
 25 #include <linux/of.h>
 26 #include <linux/of_device.h>
 27 #include <linux/platform_device.h>
 28 #include <linux/slab.h>
 29 #include <linux/pinctrl/consumer.h>
 30 
 31 #include "imx-audmux.h"
 32 
 33 #define DRIVER_NAME "imx-audmux"
 34 
 35 static struct clk *audmux_clk;
 36 static void __iomem *audmux_base;
 37 
 38 #define IMX_AUDMUX_V2_PTCR(x)           ((x) * 8)
 39 #define IMX_AUDMUX_V2_PDCR(x)           ((x) * 8 + 4)
 40 
 41 #ifdef CONFIG_DEBUG_FS
 42 static struct dentry *audmux_debugfs_root;
 43 
 44 /* There is an annoying discontinuity in the SSI numbering with regard
 45  * to the Linux number of the devices */
 46 static const char *audmux_port_string(int port)
 47 {
 48         switch (port) {
 49         case MX31_AUDMUX_PORT1_SSI0:
 50                 return "imx-ssi.0";
 51         case MX31_AUDMUX_PORT2_SSI1:
 52                 return "imx-ssi.1";
 53         case MX31_AUDMUX_PORT3_SSI_PINS_3:
 54                 return "SSI3";
 55         case MX31_AUDMUX_PORT4_SSI_PINS_4:
 56                 return "SSI4";
 57         case MX31_AUDMUX_PORT5_SSI_PINS_5:
 58                 return "SSI5";
 59         case MX31_AUDMUX_PORT6_SSI_PINS_6:
 60                 return "SSI6";
 61         default:
 62                 return "UNKNOWN";
 63         }
 64 }
 65 
 66 static ssize_t audmux_read_file(struct file *file, char __user *user_buf,
 67                                 size_t count, loff_t *ppos)
 68 {
 69         ssize_t ret;
 70         char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
 71         int port = (int)file->private_data;
 72         u32 pdcr, ptcr;
 73 
 74         if (!buf)
 75                 return -ENOMEM;
 76 
 77         if (audmux_clk)
 78                 clk_prepare_enable(audmux_clk);
 79 
 80         ptcr = readl(audmux_base + IMX_AUDMUX_V2_PTCR(port));
 81         pdcr = readl(audmux_base + IMX_AUDMUX_V2_PDCR(port));
 82 
 83         if (audmux_clk)
 84                 clk_disable_unprepare(audmux_clk);
 85 
 86         ret = snprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n",
 87                        pdcr, ptcr);
 88 
 89         if (ptcr & IMX_AUDMUX_V2_PTCR_TFSDIR)
 90                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
 91                                 "TxFS output from %s, ",
 92                                 audmux_port_string((ptcr >> 27) & 0x7));
 93         else
 94                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
 95                                 "TxFS input, ");
 96 
 97         if (ptcr & IMX_AUDMUX_V2_PTCR_TCLKDIR)
 98                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
 99                                 "TxClk output from %s",
100                                 audmux_port_string((ptcr >> 22) & 0x7));
101         else
102                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
103                                 "TxClk input");
104 
105         ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n");
106 
107         if (ptcr & IMX_AUDMUX_V2_PTCR_SYN) {
108                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
109                                 "Port is symmetric");
110         } else {
111                 if (ptcr & IMX_AUDMUX_V2_PTCR_RFSDIR)
112                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
113                                         "RxFS output from %s, ",
114                                         audmux_port_string((ptcr >> 17) & 0x7));
115                 else
116                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
117                                         "RxFS input, ");
118 
119                 if (ptcr & IMX_AUDMUX_V2_PTCR_RCLKDIR)
120                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
121                                         "RxClk output from %s",
122                                         audmux_port_string((ptcr >> 12) & 0x7));
123                 else
124                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
125                                         "RxClk input");
126         }
127 
128         ret += snprintf(buf + ret, PAGE_SIZE - ret,
129                         "\nData received from %s\n",
130                         audmux_port_string((pdcr >> 13) & 0x7));
131 
132         ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
133 
134         kfree(buf);
135 
136         return ret;
137 }
138 
139 static const struct file_operations audmux_debugfs_fops = {
140         .open = simple_open,
141         .read = audmux_read_file,
142         .llseek = default_llseek,
143 };
144 
145 static void __init audmux_debugfs_init(void)
146 {
147         int i;
148         char buf[20];
149 
150         audmux_debugfs_root = debugfs_create_dir("audmux", NULL);
151         if (!audmux_debugfs_root) {
152                 pr_warning("Failed to create AUDMUX debugfs root\n");
153                 return;
154         }
155 
156         for (i = 0; i < MX31_AUDMUX_PORT7_SSI_PINS_7 + 1; i++) {
157                 snprintf(buf, sizeof(buf), "ssi%d", i);
158                 if (!debugfs_create_file(buf, 0444, audmux_debugfs_root,
159                                          (void *)i, &audmux_debugfs_fops))
160                         pr_warning("Failed to create AUDMUX port %d debugfs file\n",
161                                    i);
162         }
163 }
164 
165 static void audmux_debugfs_remove(void)
166 {
167         debugfs_remove_recursive(audmux_debugfs_root);
168 }
169 #else
170 static inline void audmux_debugfs_init(void)
171 {
172 }
173 
174 static inline void audmux_debugfs_remove(void)
175 {
176 }
177 #endif
178 
179 static enum imx_audmux_type {
180         IMX21_AUDMUX,
181         IMX31_AUDMUX,
182 } audmux_type;
183 
184 static struct platform_device_id imx_audmux_ids[] = {
185         {
186                 .name = "imx21-audmux",
187                 .driver_data = IMX21_AUDMUX,
188         }, {
189                 .name = "imx31-audmux",
190                 .driver_data = IMX31_AUDMUX,
191         }, {
192                 /* sentinel */
193         }
194 };
195 MODULE_DEVICE_TABLE(platform, imx_audmux_ids);
196 
197 static const struct of_device_id imx_audmux_dt_ids[] = {
198         { .compatible = "fsl,imx21-audmux", .data = &imx_audmux_ids[0], },
199         { .compatible = "fsl,imx31-audmux", .data = &imx_audmux_ids[1], },
200         { /* sentinel */ }
201 };
202 MODULE_DEVICE_TABLE(of, imx_audmux_dt_ids);
203 
204 static const uint8_t port_mapping[] = {
205         0x0, 0x4, 0x8, 0x10, 0x14, 0x1c,
206 };
207 
208 int imx_audmux_v1_configure_port(unsigned int port, unsigned int pcr)
209 {
210         if (audmux_type != IMX21_AUDMUX)
211                 return -EINVAL;
212 
213         if (!audmux_base)
214                 return -ENOSYS;
215 
216         if (port >= ARRAY_SIZE(port_mapping))
217                 return -EINVAL;
218 
219         writel(pcr, audmux_base + port_mapping[port]);
220 
221         return 0;
222 }
223 EXPORT_SYMBOL_GPL(imx_audmux_v1_configure_port);
224 
225 int imx_audmux_v2_configure_port(unsigned int port, unsigned int ptcr,
226                 unsigned int pdcr)
227 {
228         if (audmux_type != IMX31_AUDMUX)
229                 return -EINVAL;
230 
231         if (!audmux_base)
232                 return -ENOSYS;
233 
234         if (audmux_clk)
235                 clk_prepare_enable(audmux_clk);
236 
237         writel(ptcr, audmux_base + IMX_AUDMUX_V2_PTCR(port));
238         writel(pdcr, audmux_base + IMX_AUDMUX_V2_PDCR(port));
239 
240         if (audmux_clk)
241                 clk_disable_unprepare(audmux_clk);
242 
243         return 0;
244 }
245 EXPORT_SYMBOL_GPL(imx_audmux_v2_configure_port);
246 
247 static int imx_audmux_probe(struct platform_device *pdev)
248 {
249         struct resource *res;
250         struct pinctrl *pinctrl;
251         const struct of_device_id *of_id =
252                         of_match_device(imx_audmux_dt_ids, &pdev->dev);
253 
254         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
255         audmux_base = devm_ioremap_resource(&pdev->dev, res);
256         if (IS_ERR(audmux_base))
257                 return PTR_ERR(audmux_base);
258 
259         pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
260         if (IS_ERR(pinctrl)) {
261                 dev_err(&pdev->dev, "setup pinctrl failed!");
262                 return PTR_ERR(pinctrl);
263         }
264 
265         audmux_clk = devm_clk_get(&pdev->dev, "audmux");
266         if (IS_ERR(audmux_clk)) {
267                 dev_dbg(&pdev->dev, "cannot get clock: %ld\n",
268                                 PTR_ERR(audmux_clk));
269                 audmux_clk = NULL;
270         }
271 
272         if (of_id)
273                 pdev->id_entry = of_id->data;
274         audmux_type = pdev->id_entry->driver_data;
275         if (audmux_type == IMX31_AUDMUX)
276                 audmux_debugfs_init();
277 
278         return 0;
279 }
280 
281 static int imx_audmux_remove(struct platform_device *pdev)
282 {
283         if (audmux_type == IMX31_AUDMUX)
284                 audmux_debugfs_remove();
285 
286         return 0;
287 }
288 
289 static struct platform_driver imx_audmux_driver = {
290         .probe          = imx_audmux_probe,
291         .remove         = imx_audmux_remove,
292         .id_table       = imx_audmux_ids,
293         .driver = {
294                 .name   = DRIVER_NAME,
295                 .owner  = THIS_MODULE,
296                 .of_match_table = imx_audmux_dt_ids,
297         }
298 };
299 
300 static int __init imx_audmux_init(void)
301 {
302         return platform_driver_register(&imx_audmux_driver);
303 }
304 subsys_initcall(imx_audmux_init);
305 
306 static void __exit imx_audmux_exit(void)
307 {
308         platform_driver_unregister(&imx_audmux_driver);
309 }
310 module_exit(imx_audmux_exit);
311 
312 MODULE_DESCRIPTION("Freescale i.MX AUDMUX driver");
313 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
314 MODULE_LICENSE("GPL v2");
315 MODULE_ALIAS("platform:" DRIVER_NAME);
316 

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