Merge tag 'locks-v3.16-2' of git://git.samba.org/jlayton/linux
[linux/fpc-iii.git] / sound / soc / fsl / imx-audmux.c
blob267717aa96c14e971329cfe2f728d1f141de72c3
1 /*
2 * Copyright 2012 Freescale Semiconductor, Inc.
3 * Copyright 2012 Linaro Ltd.
4 * Copyright 2009 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de>
6 * Initial development of this code was funded by
7 * Phytec Messtechnik GmbH, http://www.phytec.de
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.
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.
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>
30 #include "imx-audmux.h"
32 #define DRIVER_NAME "imx-audmux"
34 static struct clk *audmux_clk;
35 static void __iomem *audmux_base;
37 #define IMX_AUDMUX_V2_PTCR(x) ((x) * 8)
38 #define IMX_AUDMUX_V2_PDCR(x) ((x) * 8 + 4)
40 #ifdef CONFIG_DEBUG_FS
41 static struct dentry *audmux_debugfs_root;
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)
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";
65 static ssize_t audmux_read_file(struct file *file, char __user *user_buf,
66 size_t count, loff_t *ppos)
68 ssize_t ret;
69 char *buf;
70 int port = (int)file->private_data;
71 u32 pdcr, ptcr;
73 if (audmux_clk) {
74 ret = clk_prepare_enable(audmux_clk);
75 if (ret)
76 return ret;
79 ptcr = readl(audmux_base + IMX_AUDMUX_V2_PTCR(port));
80 pdcr = readl(audmux_base + IMX_AUDMUX_V2_PDCR(port));
82 if (audmux_clk)
83 clk_disable_unprepare(audmux_clk);
85 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
86 if (!buf)
87 return -ENOMEM;
89 ret = snprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n",
90 pdcr, ptcr);
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, ");
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");
108 ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n");
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, ");
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");
131 ret += snprintf(buf + ret, PAGE_SIZE - ret,
132 "\nData received from %s\n",
133 audmux_port_string((pdcr >> 13) & 0x7));
135 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
137 kfree(buf);
139 return ret;
142 static const struct file_operations audmux_debugfs_fops = {
143 .open = simple_open,
144 .read = audmux_read_file,
145 .llseek = default_llseek,
148 static void audmux_debugfs_init(void)
150 int i;
151 char buf[20];
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;
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",
168 static void audmux_debugfs_remove(void)
170 debugfs_remove_recursive(audmux_debugfs_root);
172 #else
173 static inline void audmux_debugfs_init(void)
177 static inline void audmux_debugfs_remove(void)
180 #endif
182 static enum imx_audmux_type {
183 IMX21_AUDMUX,
184 IMX31_AUDMUX,
185 } audmux_type;
187 static struct platform_device_id imx_audmux_ids[] = {
189 .name = "imx21-audmux",
190 .driver_data = IMX21_AUDMUX,
191 }, {
192 .name = "imx31-audmux",
193 .driver_data = IMX31_AUDMUX,
194 }, {
195 /* sentinel */
198 MODULE_DEVICE_TABLE(platform, imx_audmux_ids);
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 */ }
205 MODULE_DEVICE_TABLE(of, imx_audmux_dt_ids);
207 static const uint8_t port_mapping[] = {
208 0x0, 0x4, 0x8, 0x10, 0x14, 0x1c,
211 int imx_audmux_v1_configure_port(unsigned int port, unsigned int pcr)
213 if (audmux_type != IMX21_AUDMUX)
214 return -EINVAL;
216 if (!audmux_base)
217 return -ENOSYS;
219 if (port >= ARRAY_SIZE(port_mapping))
220 return -EINVAL;
222 writel(pcr, audmux_base + port_mapping[port]);
224 return 0;
226 EXPORT_SYMBOL_GPL(imx_audmux_v1_configure_port);
228 int imx_audmux_v2_configure_port(unsigned int port, unsigned int ptcr,
229 unsigned int pdcr)
231 int ret;
233 if (audmux_type != IMX31_AUDMUX)
234 return -EINVAL;
236 if (!audmux_base)
237 return -ENOSYS;
239 if (audmux_clk) {
240 ret = clk_prepare_enable(audmux_clk);
241 if (ret)
242 return ret;
245 writel(ptcr, audmux_base + IMX_AUDMUX_V2_PTCR(port));
246 writel(pdcr, audmux_base + IMX_AUDMUX_V2_PDCR(port));
248 if (audmux_clk)
249 clk_disable_unprepare(audmux_clk);
251 return 0;
253 EXPORT_SYMBOL_GPL(imx_audmux_v2_configure_port);
255 static int imx_audmux_parse_dt_defaults(struct platform_device *pdev,
256 struct device_node *of_node)
258 struct device_node *child;
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;
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;
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;
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;
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;
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;
306 imx_audmux_v2_configure_port(port, ptcr, pdcr);
307 } else {
308 imx_audmux_v1_configure_port(port, pcr);
312 return 0;
315 static int imx_audmux_probe(struct platform_device *pdev)
317 struct resource *res;
318 const struct of_device_id *of_id =
319 of_match_device(imx_audmux_dt_ids, &pdev->dev);
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);
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;
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();
339 if (of_id)
340 imx_audmux_parse_dt_defaults(pdev, pdev->dev.of_node);
342 return 0;
345 static int imx_audmux_remove(struct platform_device *pdev)
347 if (audmux_type == IMX31_AUDMUX)
348 audmux_debugfs_remove();
350 return 0;
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,
364 static int __init imx_audmux_init(void)
366 return platform_driver_register(&imx_audmux_driver);
368 subsys_initcall(imx_audmux_init);
370 static void __exit imx_audmux_exit(void)
372 platform_driver_unregister(&imx_audmux_driver);
374 module_exit(imx_audmux_exit);
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);