Merge tag 'asoc-3.4' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound...
[linux-flexiantxendom0-3.2.10.git] / sound / soc / imx / 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 static int audmux_open_file(struct inode *inode, struct file *file)
44 {
45         file->private_data = inode->i_private;
46         return 0;
47 }
48
49 /* There is an annoying discontinuity in the SSI numbering with regard
50  * to the Linux number of the devices */
51 static const char *audmux_port_string(int port)
52 {
53         switch (port) {
54         case MX31_AUDMUX_PORT1_SSI0:
55                 return "imx-ssi.0";
56         case MX31_AUDMUX_PORT2_SSI1:
57                 return "imx-ssi.1";
58         case MX31_AUDMUX_PORT3_SSI_PINS_3:
59                 return "SSI3";
60         case MX31_AUDMUX_PORT4_SSI_PINS_4:
61                 return "SSI4";
62         case MX31_AUDMUX_PORT5_SSI_PINS_5:
63                 return "SSI5";
64         case MX31_AUDMUX_PORT6_SSI_PINS_6:
65                 return "SSI6";
66         default:
67                 return "UNKNOWN";
68         }
69 }
70
71 static ssize_t audmux_read_file(struct file *file, char __user *user_buf,
72                                 size_t count, loff_t *ppos)
73 {
74         ssize_t ret;
75         char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
76         int port = (int)file->private_data;
77         u32 pdcr, ptcr;
78
79         if (!buf)
80                 return -ENOMEM;
81
82         if (!audmux_base)
83                 return -ENOSYS;
84
85         if (audmux_clk)
86                 clk_prepare_enable(audmux_clk);
87
88         ptcr = readl(audmux_base + IMX_AUDMUX_V2_PTCR(port));
89         pdcr = readl(audmux_base + IMX_AUDMUX_V2_PDCR(port));
90
91         if (audmux_clk)
92                 clk_disable_unprepare(audmux_clk);
93
94         ret = snprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n",
95                        pdcr, ptcr);
96
97         if (ptcr & IMX_AUDMUX_V2_PTCR_TFSDIR)
98                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
99                                 "TxFS output from %s, ",
100                                 audmux_port_string((ptcr >> 27) & 0x7));
101         else
102                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
103                                 "TxFS input, ");
104
105         if (ptcr & IMX_AUDMUX_V2_PTCR_TCLKDIR)
106                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
107                                 "TxClk output from %s",
108                                 audmux_port_string((ptcr >> 22) & 0x7));
109         else
110                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
111                                 "TxClk input");
112
113         ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n");
114
115         if (ptcr & IMX_AUDMUX_V2_PTCR_SYN) {
116                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
117                                 "Port is symmetric");
118         } else {
119                 if (ptcr & IMX_AUDMUX_V2_PTCR_RFSDIR)
120                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
121                                         "RxFS output from %s, ",
122                                         audmux_port_string((ptcr >> 17) & 0x7));
123                 else
124                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
125                                         "RxFS input, ");
126
127                 if (ptcr & IMX_AUDMUX_V2_PTCR_RCLKDIR)
128                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
129                                         "RxClk output from %s",
130                                         audmux_port_string((ptcr >> 12) & 0x7));
131                 else
132                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
133                                         "RxClk input");
134         }
135
136         ret += snprintf(buf + ret, PAGE_SIZE - ret,
137                         "\nData received from %s\n",
138                         audmux_port_string((pdcr >> 13) & 0x7));
139
140         ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
141
142         kfree(buf);
143
144         return ret;
145 }
146
147 static const struct file_operations audmux_debugfs_fops = {
148         .open = audmux_open_file,
149         .read = audmux_read_file,
150         .llseek = default_llseek,
151 };
152
153 static void __init audmux_debugfs_init(void)
154 {
155         int i;
156         char buf[20];
157
158         audmux_debugfs_root = debugfs_create_dir("audmux", NULL);
159         if (!audmux_debugfs_root) {
160                 pr_warning("Failed to create AUDMUX debugfs root\n");
161                 return;
162         }
163
164         for (i = 0; i < MX31_AUDMUX_PORT6_SSI_PINS_6 + 1; i++) {
165                 snprintf(buf, sizeof(buf), "ssi%d", i);
166                 if (!debugfs_create_file(buf, 0444, audmux_debugfs_root,
167                                          (void *)i, &audmux_debugfs_fops))
168                         pr_warning("Failed to create AUDMUX port %d debugfs file\n",
169                                    i);
170         }
171 }
172
173 static void __devexit audmux_debugfs_remove(void)
174 {
175         debugfs_remove_recursive(audmux_debugfs_root);
176 }
177 #else
178 static inline void audmux_debugfs_init(void)
179 {
180 }
181
182 static inline void audmux_debugfs_remove(void)
183 {
184 }
185 #endif
186
187 enum imx_audmux_type {
188         IMX21_AUDMUX,
189         IMX31_AUDMUX,
190 } audmux_type;
191
192 static struct platform_device_id imx_audmux_ids[] = {
193         {
194                 .name = "imx21-audmux",
195                 .driver_data = IMX21_AUDMUX,
196         }, {
197                 .name = "imx31-audmux",
198                 .driver_data = IMX31_AUDMUX,
199         }, {
200                 /* sentinel */
201         }
202 };
203 MODULE_DEVICE_TABLE(platform, imx_audmux_ids);
204
205 static const struct of_device_id imx_audmux_dt_ids[] = {
206         { .compatible = "fsl,imx21-audmux", .data = &imx_audmux_ids[0], },
207         { .compatible = "fsl,imx31-audmux", .data = &imx_audmux_ids[1], },
208         { /* sentinel */ }
209 };
210 MODULE_DEVICE_TABLE(of, imx_audmux_dt_ids);
211
212 static const uint8_t port_mapping[] = {
213         0x0, 0x4, 0x8, 0x10, 0x14, 0x1c,
214 };
215
216 int imx_audmux_v1_configure_port(unsigned int port, unsigned int pcr)
217 {
218         if (audmux_type != IMX21_AUDMUX)
219                 return -EINVAL;
220
221         if (!audmux_base)
222                 return -ENOSYS;
223
224         if (port >= ARRAY_SIZE(port_mapping))
225                 return -EINVAL;
226
227         writel(pcr, audmux_base + port_mapping[port]);
228
229         return 0;
230 }
231 EXPORT_SYMBOL_GPL(imx_audmux_v1_configure_port);
232
233 int imx_audmux_v2_configure_port(unsigned int port, unsigned int ptcr,
234                 unsigned int pdcr)
235 {
236         if (audmux_type != IMX31_AUDMUX)
237                 return -EINVAL;
238
239         if (!audmux_base)
240                 return -ENOSYS;
241
242         if (audmux_clk)
243                 clk_prepare_enable(audmux_clk);
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 __devinit imx_audmux_probe(struct platform_device *pdev)
256 {
257         struct resource *res;
258         const struct of_device_id *of_id =
259                         of_match_device(imx_audmux_dt_ids, &pdev->dev);
260
261         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
262         audmux_base = devm_request_and_ioremap(&pdev->dev, res);
263         if (!audmux_base)
264                 return -EADDRNOTAVAIL;
265
266         audmux_clk = clk_get(&pdev->dev, "audmux");
267         if (IS_ERR(audmux_clk)) {
268                 dev_dbg(&pdev->dev, "cannot get clock: %ld\n",
269                                 PTR_ERR(audmux_clk));
270                 audmux_clk = NULL;
271         }
272
273         if (of_id)
274                 pdev->id_entry = of_id->data;
275         audmux_type = pdev->id_entry->driver_data;
276         if (audmux_type == IMX31_AUDMUX)
277                 audmux_debugfs_init();
278
279         return 0;
280 }
281
282 static int __devexit imx_audmux_remove(struct platform_device *pdev)
283 {
284         if (audmux_type == IMX31_AUDMUX)
285                 audmux_debugfs_remove();
286         clk_put(audmux_clk);
287
288         return 0;
289 }
290
291 static struct platform_driver imx_audmux_driver = {
292         .probe          = imx_audmux_probe,
293         .remove         = __devexit_p(imx_audmux_remove),
294         .id_table       = imx_audmux_ids,
295         .driver = {
296                 .name   = DRIVER_NAME,
297                 .owner  = THIS_MODULE,
298                 .of_match_table = imx_audmux_dt_ids,
299         }
300 };
301
302 static int __init imx_audmux_init(void)
303 {
304         return platform_driver_register(&imx_audmux_driver);
305 }
306 subsys_initcall(imx_audmux_init);
307
308 static void __exit imx_audmux_exit(void)
309 {
310         platform_driver_unregister(&imx_audmux_driver);
311 }
312 module_exit(imx_audmux_exit);
313
314 MODULE_DESCRIPTION("Freescale i.MX AUDMUX driver");
315 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
316 MODULE_LICENSE("GPL v2");
317 MODULE_ALIAS("platform:" DRIVER_NAME);