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