1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // Copyright 2012 Freescale Semiconductor, Inc.
4 // Copyright 2012 Linaro Ltd.
5 // Copyright 2009 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de>
6 //
7 // Initial development of this code was funded by
8 // Phytec Messtechnik GmbH, https://www.phytec.de
9
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
24 static struct clk *audmux_clk;
25 static void __iomem *audmux_base;
26 static u32 *regcache;
27 static 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
33 static struct dentry *audmux_debugfs_root;
34
35 /* There is an annoying discontinuity in the SSI numbering with regard
36 * to the Linux number of the devices */
audmux_port_string(int port)37 static 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
audmux_read_file(struct file * file,char __user * user_buf,size_t count,loff_t * ppos)57 static 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 ret = clk_prepare_enable(audmux_clk);
66 if (ret)
67 return ret;
68
69 ptcr = readl(audmux_base + IMX_AUDMUX_V2_PTCR(port));
70 pdcr = readl(audmux_base + IMX_AUDMUX_V2_PDCR(port));
71
72 clk_disable_unprepare(audmux_clk);
73
74 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
75 if (!buf)
76 return -ENOMEM;
77
78 ret = scnprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n",
79 pdcr, ptcr);
80
81 if (ptcr & IMX_AUDMUX_V2_PTCR_TFSDIR)
82 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
83 "TxFS output from %s, ",
84 audmux_port_string((ptcr >> 27) & 0x7));
85 else
86 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
87 "TxFS input, ");
88
89 if (ptcr & IMX_AUDMUX_V2_PTCR_TCLKDIR)
90 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
91 "TxClk output from %s",
92 audmux_port_string((ptcr >> 22) & 0x7));
93 else
94 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
95 "TxClk input");
96
97 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n");
98
99 if (ptcr & IMX_AUDMUX_V2_PTCR_SYN) {
100 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
101 "Port is symmetric");
102 } else {
103 if (ptcr & IMX_AUDMUX_V2_PTCR_RFSDIR)
104 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
105 "RxFS output from %s, ",
106 audmux_port_string((ptcr >> 17) & 0x7));
107 else
108 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
109 "RxFS input, ");
110
111 if (ptcr & IMX_AUDMUX_V2_PTCR_RCLKDIR)
112 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
113 "RxClk output from %s",
114 audmux_port_string((ptcr >> 12) & 0x7));
115 else
116 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
117 "RxClk input");
118 }
119
120 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
121 "\nData received from %s\n",
122 audmux_port_string((pdcr >> 13) & 0x7));
123
124 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
125
126 kfree(buf);
127
128 return ret;
129 }
130
131 static const struct file_operations audmux_debugfs_fops = {
132 .open = simple_open,
133 .read = audmux_read_file,
134 .llseek = default_llseek,
135 };
136
audmux_debugfs_init(void)137 static void audmux_debugfs_init(void)
138 {
139 uintptr_t i;
140 char buf[20];
141
142 audmux_debugfs_root = debugfs_create_dir("audmux", NULL);
143
144 for (i = 0; i < MX31_AUDMUX_PORT7_SSI_PINS_7 + 1; i++) {
145 snprintf(buf, sizeof(buf), "ssi%lu", i);
146 debugfs_create_file(buf, 0444, audmux_debugfs_root,
147 (void *)i, &audmux_debugfs_fops);
148 }
149 }
150
audmux_debugfs_remove(void)151 static void audmux_debugfs_remove(void)
152 {
153 debugfs_remove_recursive(audmux_debugfs_root);
154 }
155 #else
audmux_debugfs_init(void)156 static inline void audmux_debugfs_init(void)
157 {
158 }
159
audmux_debugfs_remove(void)160 static inline void audmux_debugfs_remove(void)
161 {
162 }
163 #endif
164
165 static enum imx_audmux_type {
166 IMX21_AUDMUX,
167 IMX31_AUDMUX,
168 } audmux_type;
169
170 static const struct of_device_id imx_audmux_dt_ids[] = {
171 { .compatible = "fsl,imx21-audmux", .data = (void *)IMX21_AUDMUX, },
172 { .compatible = "fsl,imx31-audmux", .data = (void *)IMX31_AUDMUX, },
173 { /* sentinel */ }
174 };
175 MODULE_DEVICE_TABLE(of, imx_audmux_dt_ids);
176
177 static const uint8_t port_mapping[] = {
178 0x0, 0x4, 0x8, 0x10, 0x14, 0x1c,
179 };
180
imx_audmux_v1_configure_port(unsigned int port,unsigned int pcr)181 int imx_audmux_v1_configure_port(unsigned int port, unsigned int pcr)
182 {
183 if (audmux_type != IMX21_AUDMUX)
184 return -EINVAL;
185
186 if (!audmux_base)
187 return -ENOSYS;
188
189 if (port >= ARRAY_SIZE(port_mapping))
190 return -EINVAL;
191
192 writel(pcr, audmux_base + port_mapping[port]);
193
194 return 0;
195 }
196 EXPORT_SYMBOL_GPL(imx_audmux_v1_configure_port);
197
imx_audmux_v2_configure_port(unsigned int port,unsigned int ptcr,unsigned int pdcr)198 int imx_audmux_v2_configure_port(unsigned int port, unsigned int ptcr,
199 unsigned int pdcr)
200 {
201 int ret;
202
203 if (audmux_type != IMX31_AUDMUX)
204 return -EINVAL;
205
206 if (!audmux_base)
207 return -ENOSYS;
208
209 ret = clk_prepare_enable(audmux_clk);
210 if (ret)
211 return ret;
212
213 writel(ptcr, audmux_base + IMX_AUDMUX_V2_PTCR(port));
214 writel(pdcr, audmux_base + IMX_AUDMUX_V2_PDCR(port));
215
216 clk_disable_unprepare(audmux_clk);
217
218 return 0;
219 }
220 EXPORT_SYMBOL_GPL(imx_audmux_v2_configure_port);
221
imx_audmux_parse_dt_defaults(struct platform_device * pdev,struct device_node * of_node)222 static int imx_audmux_parse_dt_defaults(struct platform_device *pdev,
223 struct device_node *of_node)
224 {
225 struct device_node *child;
226
227 for_each_available_child_of_node(of_node, child) {
228 unsigned int port;
229 unsigned int ptcr = 0;
230 unsigned int pdcr = 0;
231 unsigned int pcr = 0;
232 unsigned int val;
233 int ret;
234 int i = 0;
235
236 ret = of_property_read_u32(child, "fsl,audmux-port", &port);
237 if (ret) {
238 dev_warn(&pdev->dev, "Failed to get fsl,audmux-port of child node \"%pOF\"\n",
239 child);
240 continue;
241 }
242 if (!of_property_read_bool(child, "fsl,port-config")) {
243 dev_warn(&pdev->dev, "child node \"%pOF\" does not have property fsl,port-config\n",
244 child);
245 continue;
246 }
247
248 for (i = 0; (ret = of_property_read_u32_index(child,
249 "fsl,port-config", i, &val)) == 0;
250 ++i) {
251 if (audmux_type == IMX31_AUDMUX) {
252 if (i % 2)
253 pdcr |= val;
254 else
255 ptcr |= val;
256 } else {
257 pcr |= val;
258 }
259 }
260
261 if (ret != -EOVERFLOW) {
262 dev_err(&pdev->dev, "Failed to read u32 at index %d of child %pOF\n",
263 i, child);
264 continue;
265 }
266
267 if (audmux_type == IMX31_AUDMUX) {
268 if (i % 2) {
269 dev_err(&pdev->dev, "One pdcr value is missing in child node %pOF\n",
270 child);
271 continue;
272 }
273 imx_audmux_v2_configure_port(port, ptcr, pdcr);
274 } else {
275 imx_audmux_v1_configure_port(port, pcr);
276 }
277 }
278
279 return 0;
280 }
281
imx_audmux_probe(struct platform_device * pdev)282 static int imx_audmux_probe(struct platform_device *pdev)
283 {
284 audmux_base = devm_platform_ioremap_resource(pdev, 0);
285 if (IS_ERR(audmux_base))
286 return PTR_ERR(audmux_base);
287
288 audmux_clk = devm_clk_get(&pdev->dev, "audmux");
289 if (IS_ERR(audmux_clk)) {
290 dev_dbg(&pdev->dev, "cannot get clock: %ld\n",
291 PTR_ERR(audmux_clk));
292 audmux_clk = NULL;
293 }
294
295 audmux_type = (uintptr_t)of_device_get_match_data(&pdev->dev);
296
297 switch (audmux_type) {
298 case IMX31_AUDMUX:
299 audmux_debugfs_init();
300 reg_max = 14;
301 break;
302 case IMX21_AUDMUX:
303 reg_max = 6;
304 break;
305 default:
306 dev_err(&pdev->dev, "unsupported version!\n");
307 return -EINVAL;
308 }
309
310 regcache = devm_kzalloc(&pdev->dev, sizeof(u32) * reg_max, GFP_KERNEL);
311 if (!regcache)
312 return -ENOMEM;
313
314 imx_audmux_parse_dt_defaults(pdev, pdev->dev.of_node);
315
316 return 0;
317 }
318
imx_audmux_remove(struct platform_device * pdev)319 static int imx_audmux_remove(struct platform_device *pdev)
320 {
321 if (audmux_type == IMX31_AUDMUX)
322 audmux_debugfs_remove();
323
324 return 0;
325 }
326
327 #ifdef CONFIG_PM_SLEEP
imx_audmux_suspend(struct device * dev)328 static int imx_audmux_suspend(struct device *dev)
329 {
330 int i;
331
332 clk_prepare_enable(audmux_clk);
333
334 for (i = 0; i < reg_max; i++)
335 regcache[i] = readl(audmux_base + i * 4);
336
337 clk_disable_unprepare(audmux_clk);
338
339 return 0;
340 }
341
imx_audmux_resume(struct device * dev)342 static int imx_audmux_resume(struct device *dev)
343 {
344 int i;
345
346 clk_prepare_enable(audmux_clk);
347
348 for (i = 0; i < reg_max; i++)
349 writel(regcache[i], audmux_base + i * 4);
350
351 clk_disable_unprepare(audmux_clk);
352
353 return 0;
354 }
355 #endif /* CONFIG_PM_SLEEP */
356
357 static const struct dev_pm_ops imx_audmux_pm = {
358 SET_SYSTEM_SLEEP_PM_OPS(imx_audmux_suspend, imx_audmux_resume)
359 };
360
361 static struct platform_driver imx_audmux_driver = {
362 .probe = imx_audmux_probe,
363 .remove = imx_audmux_remove,
364 .driver = {
365 .name = DRIVER_NAME,
366 .pm = &imx_audmux_pm,
367 .of_match_table = imx_audmux_dt_ids,
368 }
369 };
370
imx_audmux_init(void)371 static int __init imx_audmux_init(void)
372 {
373 return platform_driver_register(&imx_audmux_driver);
374 }
375 subsys_initcall(imx_audmux_init);
376
imx_audmux_exit(void)377 static void __exit imx_audmux_exit(void)
378 {
379 platform_driver_unregister(&imx_audmux_driver);
380 }
381 module_exit(imx_audmux_exit);
382
383 MODULE_DESCRIPTION("Freescale i.MX AUDMUX driver");
384 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
385 MODULE_LICENSE("GPL v2");
386 MODULE_ALIAS("platform:" DRIVER_NAME);
387