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

  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 
 30 #include "imx-audmux.h"
 31 
 32 #define DRIVER_NAME "imx-audmux"
 33 
 34 static struct clk *audmux_clk;
 35 static void __iomem *audmux_base;
 36 
 37 #define IMX_AUDMUX_V2_PTCR(x)           ((x) * 8)
 38 #define IMX_AUDMUX_V2_PDCR(x)           ((x) * 8 + 4)
 39 
 40 #ifdef CONFIG_DEBUG_FS
 41 static struct dentry *audmux_debugfs_root;
 42 
 43 /* There is an annoying discontinuity in the SSI numbering with regard
 44  * to the Linux number of the devices */
 45 static const char *audmux_port_string(int port)
 46 {
 47         switch (port) {
 48         case MX31_AUDMUX_PORT1_SSI0:
 49                 return "imx-ssi.0";
 50         case MX31_AUDMUX_PORT2_SSI1:
 51                 return "imx-ssi.1";
 52         case MX31_AUDMUX_PORT3_SSI_PINS_3:
 53                 return "SSI3";
 54         case MX31_AUDMUX_PORT4_SSI_PINS_4:
 55                 return "SSI4";
 56         case MX31_AUDMUX_PORT5_SSI_PINS_5:
 57                 return "SSI5";
 58         case MX31_AUDMUX_PORT6_SSI_PINS_6:
 59                 return "SSI6";
 60         default:
 61                 return "UNKNOWN";
 62         }
 63 }
 64 
 65 static ssize_t audmux_read_file(struct file *file, char __user *user_buf,
 66                                 size_t count, loff_t *ppos)
 67 {
 68         ssize_t ret;
 69         char *buf;
 70         int port = (int)file->private_data;
 71         u32 pdcr, ptcr;
 72 
 73         if (audmux_clk) {
 74                 ret = clk_prepare_enable(audmux_clk);
 75                 if (ret)
 76                         return ret;
 77         }
 78 
 79         ptcr = readl(audmux_base + IMX_AUDMUX_V2_PTCR(port));
 80         pdcr = readl(audmux_base + IMX_AUDMUX_V2_PDCR(port));
 81 
 82         if (audmux_clk)
 83                 clk_disable_unprepare(audmux_clk);
 84 
 85         buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
 86         if (!buf)
 87                 return -ENOMEM;
 88 
 89         ret = snprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n",
 90                        pdcr, ptcr);
 91 
 92         if (ptcr & IMX_AUDMUX_V2_PTCR_TFSDIR)
 93                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
 94                                 "TxFS output from %s, ",
 95                                 audmux_port_string((ptcr >> 27) & 0x7));
 96         else
 97                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
 98                                 "TxFS input, ");
 99 
100         if (ptcr & IMX_AUDMUX_V2_PTCR_TCLKDIR)
101                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
102                                 "TxClk output from %s",
103                                 audmux_port_string((ptcr >> 22) & 0x7));
104         else
105                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
106                                 "TxClk input");
107 
108         ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n");
109 
110         if (ptcr & IMX_AUDMUX_V2_PTCR_SYN) {
111                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
112                                 "Port is symmetric");
113         } else {
114                 if (ptcr & IMX_AUDMUX_V2_PTCR_RFSDIR)
115                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
116                                         "RxFS output from %s, ",
117                                         audmux_port_string((ptcr >> 17) & 0x7));
118                 else
119                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
120                                         "RxFS input, ");
121 
122                 if (ptcr & IMX_AUDMUX_V2_PTCR_RCLKDIR)
123                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
124                                         "RxClk output from %s",
125                                         audmux_port_string((ptcr >> 12) & 0x7));
126                 else
127                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
128                                         "RxClk input");
129         }
130 
131         ret += snprintf(buf + ret, PAGE_SIZE - ret,
132                         "\nData received from %s\n",
133                         audmux_port_string((pdcr >> 13) & 0x7));
134 
135         ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
136 
137         kfree(buf);
138 
139         return ret;
140 }
141 
142 static const struct file_operations audmux_debugfs_fops = {
143         .open = simple_open,
144         .read = audmux_read_file,
145         .llseek = default_llseek,
146 };
147 
148 static void audmux_debugfs_init(void)
149 {
150         int i;
151         char buf[20];
152 
153         audmux_debugfs_root = debugfs_create_dir("audmux", NULL);
154         if (!audmux_debugfs_root) {
155                 pr_warning("Failed to create AUDMUX debugfs root\n");
156                 return;
157         }
158 
159         for (i = 0; i < MX31_AUDMUX_PORT7_SSI_PINS_7 + 1; i++) {
160                 snprintf(buf, sizeof(buf), "ssi%d", i);
161                 if (!debugfs_create_file(buf, 0444, audmux_debugfs_root,
162                                          (void *)i, &audmux_debugfs_fops))
163                         pr_warning("Failed to create AUDMUX port %d debugfs file\n",
164                                    i);
165         }
166 }
167 
168 static void audmux_debugfs_remove(void)
169 {
170         debugfs_remove_recursive(audmux_debugfs_root);
171 }
172 #else
173 static inline void audmux_debugfs_init(void)
174 {
175 }
176 
177 static inline void audmux_debugfs_remove(void)
178 {
179 }
180 #endif
181 
182 static enum imx_audmux_type {
183         IMX21_AUDMUX,
184         IMX31_AUDMUX,
185 } audmux_type;
186 
187 static struct platform_device_id imx_audmux_ids[] = {
188         {
189                 .name = "imx21-audmux",
190                 .driver_data = IMX21_AUDMUX,
191         }, {
192                 .name = "imx31-audmux",
193                 .driver_data = IMX31_AUDMUX,
194         }, {
195                 /* sentinel */
196         }
197 };
198 MODULE_DEVICE_TABLE(platform, imx_audmux_ids);
199 
200 static const struct of_device_id imx_audmux_dt_ids[] = {
201         { .compatible = "fsl,imx21-audmux", .data = &imx_audmux_ids[0], },
202         { .compatible = "fsl,imx31-audmux", .data = &imx_audmux_ids[1], },
203         { /* sentinel */ }
204 };
205 MODULE_DEVICE_TABLE(of, imx_audmux_dt_ids);
206 
207 static const uint8_t port_mapping[] = {
208         0x0, 0x4, 0x8, 0x10, 0x14, 0x1c,
209 };
210 
211 int imx_audmux_v1_configure_port(unsigned int port, unsigned int pcr)
212 {
213         if (audmux_type != IMX21_AUDMUX)
214                 return -EINVAL;
215 
216         if (!audmux_base)
217                 return -ENOSYS;
218 
219         if (port >= ARRAY_SIZE(port_mapping))
220                 return -EINVAL;
221 
222         writel(pcr, audmux_base + port_mapping[port]);
223 
224         return 0;
225 }
226 EXPORT_SYMBOL_GPL(imx_audmux_v1_configure_port);
227 
228 int imx_audmux_v2_configure_port(unsigned int port, unsigned int ptcr,
229                 unsigned int pdcr)
230 {
231         int ret;
232 
233         if (audmux_type != IMX31_AUDMUX)
234                 return -EINVAL;
235 
236         if (!audmux_base)
237                 return -ENOSYS;
238 
239         if (audmux_clk) {
240                 ret = clk_prepare_enable(audmux_clk);
241                 if (ret)
242                         return ret;
243         }
244 
245         writel(ptcr, audmux_base + IMX_AUDMUX_V2_PTCR(port));
246         writel(pdcr, audmux_base + IMX_AUDMUX_V2_PDCR(port));
247 
248         if (audmux_clk)
249                 clk_disable_unprepare(audmux_clk);
250 
251         return 0;
252 }
253 EXPORT_SYMBOL_GPL(imx_audmux_v2_configure_port);
254 
255 static int imx_audmux_parse_dt_defaults(struct platform_device *pdev,
256                 struct device_node *of_node)
257 {
258         struct device_node *child;
259 
260         for_each_available_child_of_node(of_node, child) {
261                 unsigned int port;
262                 unsigned int ptcr = 0;
263                 unsigned int pdcr = 0;
264                 unsigned int pcr = 0;
265                 unsigned int val;
266                 int ret;
267                 int i = 0;
268 
269                 ret = of_property_read_u32(child, "fsl,audmux-port", &port);
270                 if (ret) {
271                         dev_warn(&pdev->dev, "Failed to get fsl,audmux-port of child node \"%s\"\n",
272                                         child->full_name);
273                         continue;
274                 }
275                 if (!of_property_read_bool(child, "fsl,port-config")) {
276                         dev_warn(&pdev->dev, "child node \"%s\" does not have property fsl,port-config\n",
277                                         child->full_name);
278                         continue;
279                 }
280 
281                 for (i = 0; (ret = of_property_read_u32_index(child,
282                                         "fsl,port-config", i, &val)) == 0;
283                                 ++i) {
284                         if (audmux_type == IMX31_AUDMUX) {
285                                 if (i % 2)
286                                         pdcr |= val;
287                                 else
288                                         ptcr |= val;
289                         } else {
290                                 pcr |= val;
291                         }
292                 }
293 
294                 if (ret != -EOVERFLOW) {
295                         dev_err(&pdev->dev, "Failed to read u32 at index %d of child %s\n",
296                                         i, child->full_name);
297                         continue;
298                 }
299 
300                 if (audmux_type == IMX31_AUDMUX) {
301                         if (i % 2) {
302                                 dev_err(&pdev->dev, "One pdcr value is missing in child node %s\n",
303                                                 child->full_name);
304                                 continue;
305                         }
306                         imx_audmux_v2_configure_port(port, ptcr, pdcr);
307                 } else {
308                         imx_audmux_v1_configure_port(port, pcr);
309                 }
310         }
311 
312         return 0;
313 }
314 
315 static int imx_audmux_probe(struct platform_device *pdev)
316 {
317         struct resource *res;
318         const struct of_device_id *of_id =
319                         of_match_device(imx_audmux_dt_ids, &pdev->dev);
320 
321         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
322         audmux_base = devm_ioremap_resource(&pdev->dev, res);
323         if (IS_ERR(audmux_base))
324                 return PTR_ERR(audmux_base);
325 
326         audmux_clk = devm_clk_get(&pdev->dev, "audmux");
327         if (IS_ERR(audmux_clk)) {
328                 dev_dbg(&pdev->dev, "cannot get clock: %ld\n",
329                                 PTR_ERR(audmux_clk));
330                 audmux_clk = NULL;
331         }
332 
333         if (of_id)
334                 pdev->id_entry = of_id->data;
335         audmux_type = pdev->id_entry->driver_data;
336         if (audmux_type == IMX31_AUDMUX)
337                 audmux_debugfs_init();
338 
339         if (of_id)
340                 imx_audmux_parse_dt_defaults(pdev, pdev->dev.of_node);
341 
342         return 0;
343 }
344 
345 static int imx_audmux_remove(struct platform_device *pdev)
346 {
347         if (audmux_type == IMX31_AUDMUX)
348                 audmux_debugfs_remove();
349 
350         return 0;
351 }
352 
353 static struct platform_driver imx_audmux_driver = {
354         .probe          = imx_audmux_probe,
355         .remove         = imx_audmux_remove,
356         .id_table       = imx_audmux_ids,
357         .driver = {
358                 .name   = DRIVER_NAME,
359                 .owner  = THIS_MODULE,
360                 .of_match_table = imx_audmux_dt_ids,
361         }
362 };
363 
364 static int __init imx_audmux_init(void)
365 {
366         return platform_driver_register(&imx_audmux_driver);
367 }
368 subsys_initcall(imx_audmux_init);
369 
370 static void __exit imx_audmux_exit(void)
371 {
372         platform_driver_unregister(&imx_audmux_driver);
373 }
374 module_exit(imx_audmux_exit);
375 
376 MODULE_DESCRIPTION("Freescale i.MX AUDMUX driver");
377 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
378 MODULE_LICENSE("GPL v2");
379 MODULE_ALIAS("platform:" DRIVER_NAME);
380 

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