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[karo-tx-linux.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_clk)
83                 clk_enable(audmux_clk);
84
85         ptcr = readl(audmux_base + IMX_AUDMUX_V2_PTCR(port));
86         pdcr = readl(audmux_base + IMX_AUDMUX_V2_PDCR(port));
87
88         if (audmux_clk)
89                 clk_disable(audmux_clk);
90
91         ret = snprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n",
92                        pdcr, ptcr);
93
94         if (ptcr & IMX_AUDMUX_V2_PTCR_TFSDIR)
95                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
96                                 "TxFS output from %s, ",
97                                 audmux_port_string((ptcr >> 27) & 0x7));
98         else
99                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
100                                 "TxFS input, ");
101
102         if (ptcr & IMX_AUDMUX_V2_PTCR_TCLKDIR)
103                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
104                                 "TxClk output from %s",
105                                 audmux_port_string((ptcr >> 22) & 0x7));
106         else
107                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
108                                 "TxClk input");
109
110         ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n");
111
112         if (ptcr & IMX_AUDMUX_V2_PTCR_SYN) {
113                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
114                                 "Port is symmetric");
115         } else {
116                 if (ptcr & IMX_AUDMUX_V2_PTCR_RFSDIR)
117                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
118                                         "RxFS output from %s, ",
119                                         audmux_port_string((ptcr >> 17) & 0x7));
120                 else
121                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
122                                         "RxFS input, ");
123
124                 if (ptcr & IMX_AUDMUX_V2_PTCR_RCLKDIR)
125                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
126                                         "RxClk output from %s",
127                                         audmux_port_string((ptcr >> 12) & 0x7));
128                 else
129                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
130                                         "RxClk input");
131         }
132
133         ret += snprintf(buf + ret, PAGE_SIZE - ret,
134                         "\nData received from %s\n",
135                         audmux_port_string((pdcr >> 13) & 0x7));
136
137         ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
138
139         kfree(buf);
140
141         return ret;
142 }
143
144 static const struct file_operations audmux_debugfs_fops = {
145         .open = audmux_open_file,
146         .read = audmux_read_file,
147         .llseek = default_llseek,
148 };
149
150 static void __init audmux_debugfs_init(void)
151 {
152         int i;
153         char buf[20];
154
155         audmux_debugfs_root = debugfs_create_dir("audmux", NULL);
156         if (!audmux_debugfs_root) {
157                 pr_warning("Failed to create AUDMUX debugfs root\n");
158                 return;
159         }
160
161         for (i = 1; i < 8; i++) {
162                 snprintf(buf, sizeof(buf), "ssi%d", i);
163                 if (!debugfs_create_file(buf, 0444, audmux_debugfs_root,
164                                          (void *)i, &audmux_debugfs_fops))
165                         pr_warning("Failed to create AUDMUX port %d debugfs file\n",
166                                    i);
167         }
168 }
169
170 static void __devexit audmux_debugfs_remove(void)
171 {
172         debugfs_remove_recursive(audmux_debugfs_root);
173 }
174 #else
175 static inline void audmux_debugfs_init(void)
176 {
177 }
178
179 static inline void audmux_debugfs_remove(void)
180 {
181 }
182 #endif
183
184 enum imx_audmux_type {
185         IMX21_AUDMUX,
186         IMX31_AUDMUX,
187 } audmux_type;
188
189 static struct platform_device_id imx_audmux_ids[] = {
190         {
191                 .name = "imx21-audmux",
192                 .driver_data = IMX21_AUDMUX,
193         }, {
194                 .name = "imx31-audmux",
195                 .driver_data = IMX31_AUDMUX,
196         }, {
197                 /* sentinel */
198         }
199 };
200 MODULE_DEVICE_TABLE(platform, imx_audmux_ids);
201
202 static const struct of_device_id imx_audmux_dt_ids[] = {
203         { .compatible = "fsl,imx21-audmux", .data = &imx_audmux_ids[0], },
204         { .compatible = "fsl,imx31-audmux", .data = &imx_audmux_ids[1], },
205         { /* sentinel */ }
206 };
207 MODULE_DEVICE_TABLE(of, imx_audmux_dt_ids);
208
209 static const uint8_t port_mapping[] = {
210         0x0, 0x4, 0x8, 0x10, 0x14, 0x1c,
211 };
212
213 int imx_audmux_v1_configure_port(unsigned int port, unsigned int pcr)
214 {
215         if (audmux_type != IMX21_AUDMUX)
216                 return -EINVAL;
217
218         if (!audmux_base)
219                 return -ENOSYS;
220
221         if (port >= ARRAY_SIZE(port_mapping))
222                 return -EINVAL;
223
224         writel(pcr, audmux_base + port_mapping[port]);
225
226         return 0;
227 }
228 EXPORT_SYMBOL_GPL(imx_audmux_v1_configure_port);
229
230 int imx_audmux_v2_configure_port(unsigned int port, unsigned int ptcr,
231                 unsigned int pdcr)
232 {
233         if (audmux_type != IMX31_AUDMUX)
234                 return -EINVAL;
235
236         if (!audmux_base)
237                 return -ENOSYS;
238
239         if (audmux_clk)
240                 clk_enable(audmux_clk);
241
242         writel(ptcr, audmux_base + IMX_AUDMUX_V2_PTCR(port));
243         writel(pdcr, audmux_base + IMX_AUDMUX_V2_PDCR(port));
244
245         if (audmux_clk)
246                 clk_disable(audmux_clk);
247
248         return 0;
249 }
250 EXPORT_SYMBOL_GPL(imx_audmux_v2_configure_port);
251
252 static int __devinit imx_audmux_probe(struct platform_device *pdev)
253 {
254         struct resource *res;
255         const struct of_device_id *of_id =
256                         of_match_device(imx_audmux_dt_ids, &pdev->dev);
257
258         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
259         audmux_base = devm_request_and_ioremap(&pdev->dev, res);
260         if (!audmux_base)
261                 return -EADDRNOTAVAIL;
262
263         audmux_clk = clk_get(&pdev->dev, "audmux");
264         if (IS_ERR(audmux_clk)) {
265                 dev_dbg(&pdev->dev, "cannot get clock: %ld\n",
266                                 PTR_ERR(audmux_clk));
267                 audmux_clk = NULL;
268         }
269
270         if (of_id)
271                 pdev->id_entry = of_id->data;
272         audmux_type = pdev->id_entry->driver_data;
273         if (audmux_type == IMX31_AUDMUX)
274                 audmux_debugfs_init();
275
276         return 0;
277 }
278
279 static int __devexit imx_audmux_remove(struct platform_device *pdev)
280 {
281         if (audmux_type == IMX31_AUDMUX)
282                 audmux_debugfs_remove();
283         clk_put(audmux_clk);
284
285         return 0;
286 }
287
288 static struct platform_driver imx_audmux_driver = {
289         .probe          = imx_audmux_probe,
290         .remove         = __devexit_p(imx_audmux_remove),
291         .id_table       = imx_audmux_ids,
292         .driver = {
293                 .name   = DRIVER_NAME,
294                 .owner  = THIS_MODULE,
295                 .of_match_table = imx_audmux_dt_ids,
296         }
297 };
298
299 static int __init imx_audmux_init(void)
300 {
301         return platform_driver_register(&imx_audmux_driver);
302 }
303 subsys_initcall(imx_audmux_init);
304
305 static void __exit imx_audmux_exit(void)
306 {
307         platform_driver_unregister(&imx_audmux_driver);
308 }
309 module_exit(imx_audmux_exit);
310
311 MODULE_DESCRIPTION("Freescale i.MX AUDMUX driver");
312 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
313 MODULE_LICENSE("GPL v2");
314 MODULE_ALIAS("platform:" DRIVER_NAME);