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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>
29
30#include "imx-audmux.h"
31
32#define DRIVER_NAME "imx-audmux"
33
34static struct clk *audmux_clk;
35static void __iomem *audmux_base;
36
37#define IMX_AUDMUX_V2_PTCR(x) ((x) * 8)
38#define IMX_AUDMUX_V2_PDCR(x) ((x) * 8 + 4)
39
40#ifdef CONFIG_DEBUG_FS
41static struct dentry *audmux_debugfs_root;
42
43
44
45static const char *audmux_port_string(int port)
46{
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";
62 }
63}
64
65static ssize_t audmux_read_file(struct file *file, char __user *user_buf,
66 size_t count, loff_t *ppos)
67{
68 ssize_t ret;
69 char *buf;
70 uintptr_t port = (uintptr_t)file->private_data;
71 u32 pdcr, ptcr;
72
73 if (audmux_clk) {
74 ret = clk_prepare_enable(audmux_clk);
75 if (ret)
76 return ret;
77 }
78
79 ptcr = readl(audmux_base + IMX_AUDMUX_V2_PTCR(port));
80 pdcr = readl(audmux_base + IMX_AUDMUX_V2_PDCR(port));
81
82 if (audmux_clk)
83 clk_disable_unprepare(audmux_clk);
84
85 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
86 if (!buf)
87 return -ENOMEM;
88
89 ret = snprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n",
90 pdcr, ptcr);
91
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, ");
99
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");
107
108 ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n");
109
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, ");
121
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");
129 }
130
131 ret += snprintf(buf + ret, PAGE_SIZE - ret,
132 "\nData received from %s\n",
133 audmux_port_string((pdcr >> 13) & 0x7));
134
135 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
136
137 kfree(buf);
138
139 return ret;
140}
141
142static const struct file_operations audmux_debugfs_fops = {
143 .open = simple_open,
144 .read = audmux_read_file,
145 .llseek = default_llseek,
146};
147
148static void audmux_debugfs_init(void)
149{
150 uintptr_t i;
151 char buf[20];
152
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;
157 }
158
159 for (i = 0; i < MX31_AUDMUX_PORT7_SSI_PINS_7 + 1; i++) {
160 snprintf(buf, sizeof(buf), "ssi%lu", 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 %lu debugfs file\n",
164 i);
165 }
166}
167
168static void audmux_debugfs_remove(void)
169{
170 debugfs_remove_recursive(audmux_debugfs_root);
171}
172#else
173static inline void audmux_debugfs_init(void)
174{
175}
176
177static inline void audmux_debugfs_remove(void)
178{
179}
180#endif
181
182static enum imx_audmux_type {
183 IMX21_AUDMUX,
184 IMX31_AUDMUX,
185} audmux_type;
186
187static const struct platform_device_id imx_audmux_ids[] = {
188 {
189 .name = "imx21-audmux",
190 .driver_data = IMX21_AUDMUX,
191 }, {
192 .name = "imx31-audmux",
193 .driver_data = IMX31_AUDMUX,
194 }, {
195
196 }
197};
198MODULE_DEVICE_TABLE(platform, imx_audmux_ids);
199
200static 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 { }
204};
205MODULE_DEVICE_TABLE(of, imx_audmux_dt_ids);
206
207static const uint8_t port_mapping[] = {
208 0x0, 0x4, 0x8, 0x10, 0x14, 0x1c,
209};
210
211int imx_audmux_v1_configure_port(unsigned int port, unsigned int pcr)
212{
213 if (audmux_type != IMX21_AUDMUX)
214 return -EINVAL;
215
216 if (!audmux_base)
217 return -ENOSYS;
218
219 if (port >= ARRAY_SIZE(port_mapping))
220 return -EINVAL;
221
222 writel(pcr, audmux_base + port_mapping[port]);
223
224 return 0;
225}
226EXPORT_SYMBOL_GPL(imx_audmux_v1_configure_port);
227
228int imx_audmux_v2_configure_port(unsigned int port, unsigned int ptcr,
229 unsigned int pdcr)
230{
231 int ret;
232
233 if (audmux_type != IMX31_AUDMUX)
234 return -EINVAL;
235
236 if (!audmux_base)
237 return -ENOSYS;
238
239 if (audmux_clk) {
240 ret = clk_prepare_enable(audmux_clk);
241 if (ret)
242 return ret;
243 }
244
245 writel(ptcr, audmux_base + IMX_AUDMUX_V2_PTCR(port));
246 writel(pdcr, audmux_base + IMX_AUDMUX_V2_PDCR(port));
247
248 if (audmux_clk)
249 clk_disable_unprepare(audmux_clk);
250
251 return 0;
252}
253EXPORT_SYMBOL_GPL(imx_audmux_v2_configure_port);
254
255static int imx_audmux_parse_dt_defaults(struct platform_device *pdev,
256 struct device_node *of_node)
257{
258 struct device_node *child;
259
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;
268
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;
274 }
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;
279 }
280
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;
291 }
292 }
293
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;
298 }
299
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;
305 }
306 imx_audmux_v2_configure_port(port, ptcr, pdcr);
307 } else {
308 imx_audmux_v1_configure_port(port, pcr);
309 }
310 }
311
312 return 0;
313}
314
315static int imx_audmux_probe(struct platform_device *pdev)
316{
317 struct resource *res;
318 const struct of_device_id *of_id =
319 of_match_device(imx_audmux_dt_ids, &pdev->dev);
320
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);
325
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;
331 }
332
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();
338
339 if (of_id)
340 imx_audmux_parse_dt_defaults(pdev, pdev->dev.of_node);
341
342 return 0;
343}
344
345static int imx_audmux_remove(struct platform_device *pdev)
346{
347 if (audmux_type == IMX31_AUDMUX)
348 audmux_debugfs_remove();
349
350 return 0;
351}
352
353static 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 .of_match_table = imx_audmux_dt_ids,
360 }
361};
362
363static int __init imx_audmux_init(void)
364{
365 return platform_driver_register(&imx_audmux_driver);
366}
367subsys_initcall(imx_audmux_init);
368
369static void __exit imx_audmux_exit(void)
370{
371 platform_driver_unregister(&imx_audmux_driver);
372}
373module_exit(imx_audmux_exit);
374
375MODULE_DESCRIPTION("Freescale i.MX AUDMUX driver");
376MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
377MODULE_LICENSE("GPL v2");
378MODULE_ALIAS("platform:" DRIVER_NAME);
379
