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9eedbdf1 | 1 | /* |
3bc34a61 RZ |
2 | * Copyright 2012 Freescale Semiconductor, Inc. |
3 | * Copyright 2012 Linaro Ltd. | |
9eedbdf1 SH |
4 | * Copyright 2009 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de> |
5 | * | |
6 | * Initial development of this code was funded by | |
7 | * Phytec Messtechnik GmbH, http://www.phytec.de | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
9eedbdf1 SH |
18 | */ |
19 | ||
9eedbdf1 | 20 | #include <linux/clk.h> |
7b4e08a7 | 21 | #include <linux/debugfs.h> |
3bc34a61 RZ |
22 | #include <linux/err.h> |
23 | #include <linux/io.h> | |
24 | #include <linux/module.h> | |
9d5ef266 RZ |
25 | #include <linux/of.h> |
26 | #include <linux/of_device.h> | |
3bc34a61 | 27 | #include <linux/platform_device.h> |
5a0e3ad6 | 28 | #include <linux/slab.h> |
3c77c29c SG |
29 | |
30 | #include "imx-audmux.h" | |
3bc34a61 RZ |
31 | |
32 | #define DRIVER_NAME "imx-audmux" | |
9eedbdf1 SH |
33 | |
34 | static struct clk *audmux_clk; | |
35 | static void __iomem *audmux_base; | |
36 | ||
af4872fb SG |
37 | #define IMX_AUDMUX_V2_PTCR(x) ((x) * 8) |
38 | #define IMX_AUDMUX_V2_PDCR(x) ((x) * 8 + 4) | |
9eedbdf1 | 39 | |
7b4e08a7 MB |
40 | #ifdef CONFIG_DEBUG_FS |
41 | static struct dentry *audmux_debugfs_root; | |
42 | ||
7b4e08a7 MB |
43 | /* There is an annoying discontinuity in the SSI numbering with regard |
44 | * to the Linux number of the devices */ | |
45 | static 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 | ||
65 | static ssize_t audmux_read_file(struct file *file, char __user *user_buf, | |
66 | size_t count, loff_t *ppos) | |
67 | { | |
68 | ssize_t ret; | |
1b3ed70a | 69 | char *buf; |
e5f89768 | 70 | uintptr_t port = (uintptr_t)file->private_data; |
7b4e08a7 MB |
71 | u32 pdcr, ptcr; |
72 | ||
72192366 FE |
73 | if (audmux_clk) { |
74 | ret = clk_prepare_enable(audmux_clk); | |
75 | if (ret) | |
76 | return ret; | |
77 | } | |
7b4e08a7 | 78 | |
af4872fb SG |
79 | ptcr = readl(audmux_base + IMX_AUDMUX_V2_PTCR(port)); |
80 | pdcr = readl(audmux_base + IMX_AUDMUX_V2_PDCR(port)); | |
7b4e08a7 MB |
81 | |
82 | if (audmux_clk) | |
bac59328 | 83 | clk_disable_unprepare(audmux_clk); |
7b4e08a7 | 84 | |
1b3ed70a FP |
85 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); |
86 | if (!buf) | |
87 | return -ENOMEM; | |
88 | ||
7b4e08a7 MB |
89 | ret = snprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n", |
90 | pdcr, ptcr); | |
91 | ||
af4872fb | 92 | if (ptcr & IMX_AUDMUX_V2_PTCR_TFSDIR) |
7b4e08a7 MB |
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 | ||
af4872fb | 100 | if (ptcr & IMX_AUDMUX_V2_PTCR_TCLKDIR) |
7b4e08a7 MB |
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 | ||
af4872fb | 110 | if (ptcr & IMX_AUDMUX_V2_PTCR_SYN) { |
7b4e08a7 MB |
111 | ret += snprintf(buf + ret, PAGE_SIZE - ret, |
112 | "Port is symmetric"); | |
113 | } else { | |
af4872fb | 114 | if (ptcr & IMX_AUDMUX_V2_PTCR_RFSDIR) |
7b4e08a7 MB |
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 | ||
af4872fb | 122 | if (ptcr & IMX_AUDMUX_V2_PTCR_RCLKDIR) |
7b4e08a7 MB |
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 | ||
142 | static const struct file_operations audmux_debugfs_fops = { | |
234e3405 | 143 | .open = simple_open, |
7b4e08a7 | 144 | .read = audmux_read_file, |
6038f373 | 145 | .llseek = default_llseek, |
7b4e08a7 MB |
146 | }; |
147 | ||
b8909783 | 148 | static void audmux_debugfs_init(void) |
7b4e08a7 | 149 | { |
e5f89768 | 150 | uintptr_t i; |
7b4e08a7 MB |
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 | ||
409b78cc | 159 | for (i = 0; i < MX31_AUDMUX_PORT7_SSI_PINS_7 + 1; i++) { |
e5f89768 | 160 | snprintf(buf, sizeof(buf), "ssi%lu", i); |
7b4e08a7 MB |
161 | if (!debugfs_create_file(buf, 0444, audmux_debugfs_root, |
162 | (void *)i, &audmux_debugfs_fops)) | |
e5f89768 | 163 | pr_warning("Failed to create AUDMUX port %lu debugfs file\n", |
7b4e08a7 MB |
164 | i); |
165 | } | |
166 | } | |
3bc34a61 | 167 | |
a0a3d518 | 168 | static void audmux_debugfs_remove(void) |
3bc34a61 RZ |
169 | { |
170 | debugfs_remove_recursive(audmux_debugfs_root); | |
171 | } | |
7b4e08a7 MB |
172 | #else |
173 | static inline void audmux_debugfs_init(void) | |
174 | { | |
175 | } | |
3bc34a61 RZ |
176 | |
177 | static inline void audmux_debugfs_remove(void) | |
178 | { | |
179 | } | |
7b4e08a7 MB |
180 | #endif |
181 | ||
a10807ae | 182 | static enum imx_audmux_type { |
3bc34a61 RZ |
183 | IMX21_AUDMUX, |
184 | IMX31_AUDMUX, | |
185 | } audmux_type; | |
186 | ||
e51cebf7 | 187 | static const struct platform_device_id imx_audmux_ids[] = { |
3bc34a61 RZ |
188 | { |
189 | .name = "imx21-audmux", | |
190 | .driver_data = IMX21_AUDMUX, | |
191 | }, { | |
192 | .name = "imx31-audmux", | |
193 | .driver_data = IMX31_AUDMUX, | |
194 | }, { | |
195 | /* sentinel */ | |
196 | } | |
197 | }; | |
198 | MODULE_DEVICE_TABLE(platform, imx_audmux_ids); | |
199 | ||
9d5ef266 RZ |
200 | static 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 | { /* sentinel */ } | |
204 | }; | |
205 | MODULE_DEVICE_TABLE(of, imx_audmux_dt_ids); | |
206 | ||
2405fc97 SG |
207 | static const uint8_t port_mapping[] = { |
208 | 0x0, 0x4, 0x8, 0x10, 0x14, 0x1c, | |
209 | }; | |
210 | ||
af4872fb | 211 | int imx_audmux_v1_configure_port(unsigned int port, unsigned int pcr) |
2405fc97 | 212 | { |
3bc34a61 RZ |
213 | if (audmux_type != IMX21_AUDMUX) |
214 | return -EINVAL; | |
215 | ||
2405fc97 SG |
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 | } | |
af4872fb | 226 | EXPORT_SYMBOL_GPL(imx_audmux_v1_configure_port); |
2405fc97 | 227 | |
af4872fb | 228 | int imx_audmux_v2_configure_port(unsigned int port, unsigned int ptcr, |
9eedbdf1 SH |
229 | unsigned int pdcr) |
230 | { | |
72192366 FE |
231 | int ret; |
232 | ||
3bc34a61 RZ |
233 | if (audmux_type != IMX31_AUDMUX) |
234 | return -EINVAL; | |
235 | ||
9eedbdf1 SH |
236 | if (!audmux_base) |
237 | return -ENOSYS; | |
238 | ||
72192366 FE |
239 | if (audmux_clk) { |
240 | ret = clk_prepare_enable(audmux_clk); | |
241 | if (ret) | |
242 | return ret; | |
243 | } | |
9eedbdf1 | 244 | |
af4872fb SG |
245 | writel(ptcr, audmux_base + IMX_AUDMUX_V2_PTCR(port)); |
246 | writel(pdcr, audmux_base + IMX_AUDMUX_V2_PDCR(port)); | |
9eedbdf1 SH |
247 | |
248 | if (audmux_clk) | |
bac59328 | 249 | clk_disable_unprepare(audmux_clk); |
9eedbdf1 SH |
250 | |
251 | return 0; | |
252 | } | |
af4872fb | 253 | EXPORT_SYMBOL_GPL(imx_audmux_v2_configure_port); |
9eedbdf1 | 254 | |
8548a464 MP |
255 | static 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, | |
9c0aeaa3 | 282 | "fsl,port-config", i, &val)) == 0; |
8548a464 MP |
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 | ||
9c0aeaa3 | 294 | if (ret != -EOVERFLOW) { |
8548a464 MP |
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 | ||
a0a3d518 | 315 | static int imx_audmux_probe(struct platform_device *pdev) |
9eedbdf1 | 316 | { |
3bc34a61 | 317 | struct resource *res; |
9d5ef266 RZ |
318 | const struct of_device_id *of_id = |
319 | of_match_device(imx_audmux_dt_ids, &pdev->dev); | |
3bc34a61 RZ |
320 | |
321 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
b25b5aa0 TR |
322 | audmux_base = devm_ioremap_resource(&pdev->dev, res); |
323 | if (IS_ERR(audmux_base)) | |
324 | return PTR_ERR(audmux_base); | |
3bc34a61 | 325 | |
127c5cad | 326 | audmux_clk = devm_clk_get(&pdev->dev, "audmux"); |
3bc34a61 RZ |
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; | |
8402ed30 | 331 | } |
56c6b872 | 332 | |
9d5ef266 RZ |
333 | if (of_id) |
334 | pdev->id_entry = of_id->data; | |
3bc34a61 RZ |
335 | audmux_type = pdev->id_entry->driver_data; |
336 | if (audmux_type == IMX31_AUDMUX) | |
2405fc97 | 337 | audmux_debugfs_init(); |
7b4e08a7 | 338 | |
bae35992 FE |
339 | if (of_id) |
340 | imx_audmux_parse_dt_defaults(pdev, pdev->dev.of_node); | |
8548a464 | 341 | |
9eedbdf1 SH |
342 | return 0; |
343 | } | |
344 | ||
a0a3d518 | 345 | static int imx_audmux_remove(struct platform_device *pdev) |
3bc34a61 RZ |
346 | { |
347 | if (audmux_type == IMX31_AUDMUX) | |
348 | audmux_debugfs_remove(); | |
3bc34a61 RZ |
349 | |
350 | return 0; | |
351 | } | |
352 | ||
353 | static struct platform_driver imx_audmux_driver = { | |
354 | .probe = imx_audmux_probe, | |
a0a3d518 | 355 | .remove = imx_audmux_remove, |
3bc34a61 RZ |
356 | .id_table = imx_audmux_ids, |
357 | .driver = { | |
358 | .name = DRIVER_NAME, | |
9d5ef266 | 359 | .of_match_table = imx_audmux_dt_ids, |
3bc34a61 RZ |
360 | } |
361 | }; | |
362 | ||
363 | static int __init imx_audmux_init(void) | |
364 | { | |
365 | return platform_driver_register(&imx_audmux_driver); | |
366 | } | |
367 | subsys_initcall(imx_audmux_init); | |
368 | ||
369 | static void __exit imx_audmux_exit(void) | |
370 | { | |
371 | platform_driver_unregister(&imx_audmux_driver); | |
372 | } | |
373 | module_exit(imx_audmux_exit); | |
374 | ||
375 | MODULE_DESCRIPTION("Freescale i.MX AUDMUX driver"); | |
376 | MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>"); | |
377 | MODULE_LICENSE("GPL v2"); | |
378 | MODULE_ALIAS("platform:" DRIVER_NAME); |