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10#include <linux/clk.h>
11#include <linux/debugfs.h>
12#include <linux/err.h>
13#include <linux/io.h>
14#include <linux/module.h>
15#include <linux/of.h>
16#include <linux/of_device.h>
17#include <linux/platform_device.h>
18#include <linux/slab.h>
19
20#include "imx-audmux.h"
21
22#define DRIVER_NAME "imx-audmux"
23
24static struct clk *audmux_clk;
25static void __iomem *audmux_base;
26static u32 *regcache;
27static u32 reg_max;
28
29#define IMX_AUDMUX_V2_PTCR(x) ((x) * 8)
30#define IMX_AUDMUX_V2_PDCR(x) ((x) * 8 + 4)
31
32#ifdef CONFIG_DEBUG_FS
33static struct dentry *audmux_debugfs_root;
34
35
36
37static const char *audmux_port_string(int port)
38{
39 switch (port) {
40 case MX31_AUDMUX_PORT1_SSI0:
41 return "imx-ssi.0";
42 case MX31_AUDMUX_PORT2_SSI1:
43 return "imx-ssi.1";
44 case MX31_AUDMUX_PORT3_SSI_PINS_3:
45 return "SSI3";
46 case MX31_AUDMUX_PORT4_SSI_PINS_4:
47 return "SSI4";
48 case MX31_AUDMUX_PORT5_SSI_PINS_5:
49 return "SSI5";
50 case MX31_AUDMUX_PORT6_SSI_PINS_6:
51 return "SSI6";
52 default:
53 return "UNKNOWN";
54 }
55}
56
57static ssize_t audmux_read_file(struct file *file, char __user *user_buf,
58 size_t count, loff_t *ppos)
59{
60 ssize_t ret;
61 char *buf;
62 uintptr_t port = (uintptr_t)file->private_data;
63 u32 pdcr, ptcr;
64
65 if (audmux_clk) {
66 ret = clk_prepare_enable(audmux_clk);
67 if (ret)
68 return ret;
69 }
70
71 ptcr = readl(audmux_base + IMX_AUDMUX_V2_PTCR(port));
72 pdcr = readl(audmux_base + IMX_AUDMUX_V2_PDCR(port));
73
74 if (audmux_clk)
75 clk_disable_unprepare(audmux_clk);
76
77 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
78 if (!buf)
79 return -ENOMEM;
80
81 ret = scnprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n",
82 pdcr, ptcr);
83
84 if (ptcr & IMX_AUDMUX_V2_PTCR_TFSDIR)
85 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
86 "TxFS output from %s, ",
87 audmux_port_string((ptcr >> 27) & 0x7));
88 else
89 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
90 "TxFS input, ");
91
92 if (ptcr & IMX_AUDMUX_V2_PTCR_TCLKDIR)
93 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
94 "TxClk output from %s",
95 audmux_port_string((ptcr >> 22) & 0x7));
96 else
97 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
98 "TxClk input");
99
100 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n");
101
102 if (ptcr & IMX_AUDMUX_V2_PTCR_SYN) {
103 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
104 "Port is symmetric");
105 } else {
106 if (ptcr & IMX_AUDMUX_V2_PTCR_RFSDIR)
107 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
108 "RxFS output from %s, ",
109 audmux_port_string((ptcr >> 17) & 0x7));
110 else
111 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
112 "RxFS input, ");
113
114 if (ptcr & IMX_AUDMUX_V2_PTCR_RCLKDIR)
115 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
116 "RxClk output from %s",
117 audmux_port_string((ptcr >> 12) & 0x7));
118 else
119 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
120 "RxClk input");
121 }
122
123 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
124 "\nData received from %s\n",
125 audmux_port_string((pdcr >> 13) & 0x7));
126
127 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
128
129 kfree(buf);
130
131 return ret;
132}
133
134static const struct file_operations audmux_debugfs_fops = {
135 .open = simple_open,
136 .read = audmux_read_file,
137 .llseek = default_llseek,
138};
139
140static void audmux_debugfs_init(void)
141{
142 uintptr_t i;
143 char buf[20];
144
145 audmux_debugfs_root = debugfs_create_dir("audmux", NULL);
146
147 for (i = 0; i < MX31_AUDMUX_PORT7_SSI_PINS_7 + 1; i++) {
148 snprintf(buf, sizeof(buf), "ssi%lu", i);
149 debugfs_create_file(buf, 0444, audmux_debugfs_root,
150 (void *)i, &audmux_debugfs_fops);
151 }
152}
153
154static void audmux_debugfs_remove(void)
155{
156 debugfs_remove_recursive(audmux_debugfs_root);
157}
158#else
159static inline void audmux_debugfs_init(void)
160{
161}
162
163static inline void audmux_debugfs_remove(void)
164{
165}
166#endif
167
168static enum imx_audmux_type {
169 IMX21_AUDMUX,
170 IMX31_AUDMUX,
171} audmux_type;
172
173static const struct platform_device_id imx_audmux_ids[] = {
174 {
175 .name = "imx21-audmux",
176 .driver_data = IMX21_AUDMUX,
177 }, {
178 .name = "imx31-audmux",
179 .driver_data = IMX31_AUDMUX,
180 }, {
181
182 }
183};
184MODULE_DEVICE_TABLE(platform, imx_audmux_ids);
185
186static const struct of_device_id imx_audmux_dt_ids[] = {
187 { .compatible = "fsl,imx21-audmux", .data = &imx_audmux_ids[0], },
188 { .compatible = "fsl,imx31-audmux", .data = &imx_audmux_ids[1], },
189 { }
190};
191MODULE_DEVICE_TABLE(of, imx_audmux_dt_ids);
192
193static const uint8_t port_mapping[] = {
194 0x0, 0x4, 0x8, 0x10, 0x14, 0x1c,
195};
196
197int imx_audmux_v1_configure_port(unsigned int port, unsigned int pcr)
198{
199 if (audmux_type != IMX21_AUDMUX)
200 return -EINVAL;
201
202 if (!audmux_base)
203 return -ENOSYS;
204
205 if (port >= ARRAY_SIZE(port_mapping))
206 return -EINVAL;
207
208 writel(pcr, audmux_base + port_mapping[port]);
209
210 return 0;
211}
212EXPORT_SYMBOL_GPL(imx_audmux_v1_configure_port);
213
214int imx_audmux_v2_configure_port(unsigned int port, unsigned int ptcr,
215 unsigned int pdcr)
216{
217 int ret;
218
219 if (audmux_type != IMX31_AUDMUX)
220 return -EINVAL;
221
222 if (!audmux_base)
223 return -ENOSYS;
224
225 if (audmux_clk) {
226 ret = clk_prepare_enable(audmux_clk);
227 if (ret)
228 return ret;
229 }
230
231 writel(ptcr, audmux_base + IMX_AUDMUX_V2_PTCR(port));
232 writel(pdcr, audmux_base + IMX_AUDMUX_V2_PDCR(port));
233
234 if (audmux_clk)
235 clk_disable_unprepare(audmux_clk);
236
237 return 0;
238}
239EXPORT_SYMBOL_GPL(imx_audmux_v2_configure_port);
240
241static int imx_audmux_parse_dt_defaults(struct platform_device *pdev,
242 struct device_node *of_node)
243{
244 struct device_node *child;
245
246 for_each_available_child_of_node(of_node, child) {
247 unsigned int port;
248 unsigned int ptcr = 0;
249 unsigned int pdcr = 0;
250 unsigned int pcr = 0;
251 unsigned int val;
252 int ret;
253 int i = 0;
254
255 ret = of_property_read_u32(child, "fsl,audmux-port", &port);
256 if (ret) {
257 dev_warn(&pdev->dev, "Failed to get fsl,audmux-port of child node \"%pOF\"\n",
258 child);
259 continue;
260 }
261 if (!of_property_read_bool(child, "fsl,port-config")) {
262 dev_warn(&pdev->dev, "child node \"%pOF\" does not have property fsl,port-config\n",
263 child);
264 continue;
265 }
266
267 for (i = 0; (ret = of_property_read_u32_index(child,
268 "fsl,port-config", i, &val)) == 0;
269 ++i) {
270 if (audmux_type == IMX31_AUDMUX) {
271 if (i % 2)
272 pdcr |= val;
273 else
274 ptcr |= val;
275 } else {
276 pcr |= val;
277 }
278 }
279
280 if (ret != -EOVERFLOW) {
281 dev_err(&pdev->dev, "Failed to read u32 at index %d of child %pOF\n",
282 i, child);
283 continue;
284 }
285
286 if (audmux_type == IMX31_AUDMUX) {
287 if (i % 2) {
288 dev_err(&pdev->dev, "One pdcr value is missing in child node %pOF\n",
289 child);
290 continue;
291 }
292 imx_audmux_v2_configure_port(port, ptcr, pdcr);
293 } else {
294 imx_audmux_v1_configure_port(port, pcr);
295 }
296 }
297
298 return 0;
299}
300
301static int imx_audmux_probe(struct platform_device *pdev)
302{
303 const struct of_device_id *of_id =
304 of_match_device(imx_audmux_dt_ids, &pdev->dev);
305
306 audmux_base = devm_platform_ioremap_resource(pdev, 0);
307 if (IS_ERR(audmux_base))
308 return PTR_ERR(audmux_base);
309
310 audmux_clk = devm_clk_get(&pdev->dev, "audmux");
311 if (IS_ERR(audmux_clk)) {
312 dev_dbg(&pdev->dev, "cannot get clock: %ld\n",
313 PTR_ERR(audmux_clk));
314 audmux_clk = NULL;
315 }
316
317 if (of_id)
318 pdev->id_entry = of_id->data;
319 audmux_type = pdev->id_entry->driver_data;
320
321 switch (audmux_type) {
322 case IMX31_AUDMUX:
323 audmux_debugfs_init();
324 reg_max = 14;
325 break;
326 case IMX21_AUDMUX:
327 reg_max = 6;
328 break;
329 default:
330 dev_err(&pdev->dev, "unsupported version!\n");
331 return -EINVAL;
332 }
333
334 regcache = devm_kzalloc(&pdev->dev, sizeof(u32) * reg_max, GFP_KERNEL);
335 if (!regcache)
336 return -ENOMEM;
337
338 if (of_id)
339 imx_audmux_parse_dt_defaults(pdev, pdev->dev.of_node);
340
341 return 0;
342}
343
344static int imx_audmux_remove(struct platform_device *pdev)
345{
346 if (audmux_type == IMX31_AUDMUX)
347 audmux_debugfs_remove();
348
349 return 0;
350}
351
352#ifdef CONFIG_PM_SLEEP
353static int imx_audmux_suspend(struct device *dev)
354{
355 int i;
356
357 clk_prepare_enable(audmux_clk);
358
359 for (i = 0; i < reg_max; i++)
360 regcache[i] = readl(audmux_base + i * 4);
361
362 clk_disable_unprepare(audmux_clk);
363
364 return 0;
365}
366
367static int imx_audmux_resume(struct device *dev)
368{
369 int i;
370
371 clk_prepare_enable(audmux_clk);
372
373 for (i = 0; i < reg_max; i++)
374 writel(regcache[i], audmux_base + i * 4);
375
376 clk_disable_unprepare(audmux_clk);
377
378 return 0;
379}
380#endif
381
382static const struct dev_pm_ops imx_audmux_pm = {
383 SET_SYSTEM_SLEEP_PM_OPS(imx_audmux_suspend, imx_audmux_resume)
384};
385
386static struct platform_driver imx_audmux_driver = {
387 .probe = imx_audmux_probe,
388 .remove = imx_audmux_remove,
389 .id_table = imx_audmux_ids,
390 .driver = {
391 .name = DRIVER_NAME,
392 .pm = &imx_audmux_pm,
393 .of_match_table = imx_audmux_dt_ids,
394 }
395};
396
397static int __init imx_audmux_init(void)
398{
399 return platform_driver_register(&imx_audmux_driver);
400}
401subsys_initcall(imx_audmux_init);
402
403static void __exit imx_audmux_exit(void)
404{
405 platform_driver_unregister(&imx_audmux_driver);
406}
407module_exit(imx_audmux_exit);
408
409MODULE_DESCRIPTION("Freescale i.MX AUDMUX driver");
410MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
411MODULE_LICENSE("GPL v2");
412MODULE_ALIAS("platform:" DRIVER_NAME);
413
