1
2
3
4
5
6
7
8
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
24static struct clk *audmux_clk;
25static void __iomem *audmux_base;
26
27#define IMX_AUDMUX_V2_PTCR(x) ((x) * 8)
28#define IMX_AUDMUX_V2_PDCR(x) ((x) * 8 + 4)
29
30#ifdef CONFIG_DEBUG_FS
31static struct dentry *audmux_debugfs_root;
32
33
34
35static const char *audmux_port_string(int port)
36{
37 switch (port) {
38 case MX31_AUDMUX_PORT1_SSI0:
39 return "imx-ssi.0";
40 case MX31_AUDMUX_PORT2_SSI1:
41 return "imx-ssi.1";
42 case MX31_AUDMUX_PORT3_SSI_PINS_3:
43 return "SSI3";
44 case MX31_AUDMUX_PORT4_SSI_PINS_4:
45 return "SSI4";
46 case MX31_AUDMUX_PORT5_SSI_PINS_5:
47 return "SSI5";
48 case MX31_AUDMUX_PORT6_SSI_PINS_6:
49 return "SSI6";
50 default:
51 return "UNKNOWN";
52 }
53}
54
55static ssize_t audmux_read_file(struct file *file, char __user *user_buf,
56 size_t count, loff_t *ppos)
57{
58 ssize_t ret;
59 char *buf;
60 uintptr_t port = (uintptr_t)file->private_data;
61 u32 pdcr, ptcr;
62
63 if (audmux_clk) {
64 ret = clk_prepare_enable(audmux_clk);
65 if (ret)
66 return ret;
67 }
68
69 ptcr = readl(audmux_base + IMX_AUDMUX_V2_PTCR(port));
70 pdcr = readl(audmux_base + IMX_AUDMUX_V2_PDCR(port));
71
72 if (audmux_clk)
73 clk_disable_unprepare(audmux_clk);
74
75 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
76 if (!buf)
77 return -ENOMEM;
78
79 ret = scnprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n",
80 pdcr, ptcr);
81
82 if (ptcr & IMX_AUDMUX_V2_PTCR_TFSDIR)
83 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
84 "TxFS output from %s, ",
85 audmux_port_string((ptcr >> 27) & 0x7));
86 else
87 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
88 "TxFS input, ");
89
90 if (ptcr & IMX_AUDMUX_V2_PTCR_TCLKDIR)
91 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
92 "TxClk output from %s",
93 audmux_port_string((ptcr >> 22) & 0x7));
94 else
95 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
96 "TxClk input");
97
98 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n");
99
100 if (ptcr & IMX_AUDMUX_V2_PTCR_SYN) {
101 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
102 "Port is symmetric");
103 } else {
104 if (ptcr & IMX_AUDMUX_V2_PTCR_RFSDIR)
105 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
106 "RxFS output from %s, ",
107 audmux_port_string((ptcr >> 17) & 0x7));
108 else
109 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
110 "RxFS input, ");
111
112 if (ptcr & IMX_AUDMUX_V2_PTCR_RCLKDIR)
113 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
114 "RxClk output from %s",
115 audmux_port_string((ptcr >> 12) & 0x7));
116 else
117 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
118 "RxClk input");
119 }
120
121 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
122 "\nData received from %s\n",
123 audmux_port_string((pdcr >> 13) & 0x7));
124
125 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
126
127 kfree(buf);
128
129 return ret;
130}
131
132static const struct file_operations audmux_debugfs_fops = {
133 .open = simple_open,
134 .read = audmux_read_file,
135 .llseek = default_llseek,
136};
137
138static void audmux_debugfs_init(void)
139{
140 uintptr_t i;
141 char buf[20];
142
143 audmux_debugfs_root = debugfs_create_dir("audmux", NULL);
144
145 for (i = 0; i < MX31_AUDMUX_PORT7_SSI_PINS_7 + 1; i++) {
146 snprintf(buf, sizeof(buf), "ssi%lu", i);
147 debugfs_create_file(buf, 0444, audmux_debugfs_root,
148 (void *)i, &audmux_debugfs_fops);
149 }
150}
151
152static void audmux_debugfs_remove(void)
153{
154 debugfs_remove_recursive(audmux_debugfs_root);
155}
156#else
157static inline void audmux_debugfs_init(void)
158{
159}
160
161static inline void audmux_debugfs_remove(void)
162{
163}
164#endif
165
166static enum imx_audmux_type {
167 IMX21_AUDMUX,
168 IMX31_AUDMUX,
169} audmux_type;
170
171static const struct platform_device_id imx_audmux_ids[] = {
172 {
173 .name = "imx21-audmux",
174 .driver_data = IMX21_AUDMUX,
175 }, {
176 .name = "imx31-audmux",
177 .driver_data = IMX31_AUDMUX,
178 }, {
179
180 }
181};
182MODULE_DEVICE_TABLE(platform, imx_audmux_ids);
183
184static const struct of_device_id imx_audmux_dt_ids[] = {
185 { .compatible = "fsl,imx21-audmux", .data = &imx_audmux_ids[0], },
186 { .compatible = "fsl,imx31-audmux", .data = &imx_audmux_ids[1], },
187 { }
188};
189MODULE_DEVICE_TABLE(of, imx_audmux_dt_ids);
190
191static const uint8_t port_mapping[] = {
192 0x0, 0x4, 0x8, 0x10, 0x14, 0x1c,
193};
194
195int imx_audmux_v1_configure_port(unsigned int port, unsigned int pcr)
196{
197 if (audmux_type != IMX21_AUDMUX)
198 return -EINVAL;
199
200 if (!audmux_base)
201 return -ENOSYS;
202
203 if (port >= ARRAY_SIZE(port_mapping))
204 return -EINVAL;
205
206 writel(pcr, audmux_base + port_mapping[port]);
207
208 return 0;
209}
210EXPORT_SYMBOL_GPL(imx_audmux_v1_configure_port);
211
212int imx_audmux_v2_configure_port(unsigned int port, unsigned int ptcr,
213 unsigned int pdcr)
214{
215 int ret;
216
217 if (audmux_type != IMX31_AUDMUX)
218 return -EINVAL;
219
220 if (!audmux_base)
221 return -ENOSYS;
222
223 if (audmux_clk) {
224 ret = clk_prepare_enable(audmux_clk);
225 if (ret)
226 return ret;
227 }
228
229 writel(ptcr, audmux_base + IMX_AUDMUX_V2_PTCR(port));
230 writel(pdcr, audmux_base + IMX_AUDMUX_V2_PDCR(port));
231
232 if (audmux_clk)
233 clk_disable_unprepare(audmux_clk);
234
235 return 0;
236}
237EXPORT_SYMBOL_GPL(imx_audmux_v2_configure_port);
238
239static int imx_audmux_parse_dt_defaults(struct platform_device *pdev,
240 struct device_node *of_node)
241{
242 struct device_node *child;
243
244 for_each_available_child_of_node(of_node, child) {
245 unsigned int port;
246 unsigned int ptcr = 0;
247 unsigned int pdcr = 0;
248 unsigned int pcr = 0;
249 unsigned int val;
250 int ret;
251 int i = 0;
252
253 ret = of_property_read_u32(child, "fsl,audmux-port", &port);
254 if (ret) {
255 dev_warn(&pdev->dev, "Failed to get fsl,audmux-port of child node \"%pOF\"\n",
256 child);
257 continue;
258 }
259 if (!of_property_read_bool(child, "fsl,port-config")) {
260 dev_warn(&pdev->dev, "child node \"%pOF\" does not have property fsl,port-config\n",
261 child);
262 continue;
263 }
264
265 for (i = 0; (ret = of_property_read_u32_index(child,
266 "fsl,port-config", i, &val)) == 0;
267 ++i) {
268 if (audmux_type == IMX31_AUDMUX) {
269 if (i % 2)
270 pdcr |= val;
271 else
272 ptcr |= val;
273 } else {
274 pcr |= val;
275 }
276 }
277
278 if (ret != -EOVERFLOW) {
279 dev_err(&pdev->dev, "Failed to read u32 at index %d of child %pOF\n",
280 i, child);
281 continue;
282 }
283
284 if (audmux_type == IMX31_AUDMUX) {
285 if (i % 2) {
286 dev_err(&pdev->dev, "One pdcr value is missing in child node %pOF\n",
287 child);
288 continue;
289 }
290 imx_audmux_v2_configure_port(port, ptcr, pdcr);
291 } else {
292 imx_audmux_v1_configure_port(port, pcr);
293 }
294 }
295
296 return 0;
297}
298
299static int imx_audmux_probe(struct platform_device *pdev)
300{
301 struct resource *res;
302 const struct of_device_id *of_id =
303 of_match_device(imx_audmux_dt_ids, &pdev->dev);
304
305 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
306 audmux_base = devm_ioremap_resource(&pdev->dev, res);
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 if (audmux_type == IMX31_AUDMUX)
321 audmux_debugfs_init();
322
323 if (of_id)
324 imx_audmux_parse_dt_defaults(pdev, pdev->dev.of_node);
325
326 return 0;
327}
328
329static int imx_audmux_remove(struct platform_device *pdev)
330{
331 if (audmux_type == IMX31_AUDMUX)
332 audmux_debugfs_remove();
333
334 return 0;
335}
336
337static struct platform_driver imx_audmux_driver = {
338 .probe = imx_audmux_probe,
339 .remove = imx_audmux_remove,
340 .id_table = imx_audmux_ids,
341 .driver = {
342 .name = DRIVER_NAME,
343 .of_match_table = imx_audmux_dt_ids,
344 }
345};
346
347static int __init imx_audmux_init(void)
348{
349 return platform_driver_register(&imx_audmux_driver);
350}
351subsys_initcall(imx_audmux_init);
352
353static void __exit imx_audmux_exit(void)
354{
355 platform_driver_unregister(&imx_audmux_driver);
356}
357module_exit(imx_audmux_exit);
358
359MODULE_DESCRIPTION("Freescale i.MX AUDMUX driver");
360MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
361MODULE_LICENSE("GPL v2");
362MODULE_ALIAS("platform:" DRIVER_NAME);
363
