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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; | |
69 | char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
70 | int port = (int)file->private_data; | |
71 | u32 pdcr, ptcr; | |
72 | ||
73 | if (!buf) | |
74 | return -ENOMEM; | |
75 | ||
72192366 FE |
76 | if (audmux_clk) { |
77 | ret = clk_prepare_enable(audmux_clk); | |
78 | if (ret) | |
79 | return ret; | |
80 | } | |
7b4e08a7 | 81 | |
af4872fb SG |
82 | ptcr = readl(audmux_base + IMX_AUDMUX_V2_PTCR(port)); |
83 | pdcr = readl(audmux_base + IMX_AUDMUX_V2_PDCR(port)); | |
7b4e08a7 MB |
84 | |
85 | if (audmux_clk) | |
bac59328 | 86 | clk_disable_unprepare(audmux_clk); |
7b4e08a7 MB |
87 | |
88 | ret = snprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n", | |
89 | pdcr, ptcr); | |
90 | ||
af4872fb | 91 | if (ptcr & IMX_AUDMUX_V2_PTCR_TFSDIR) |
7b4e08a7 MB |
92 | ret += snprintf(buf + ret, PAGE_SIZE - ret, |
93 | "TxFS output from %s, ", | |
94 | audmux_port_string((ptcr >> 27) & 0x7)); | |
95 | else | |
96 | ret += snprintf(buf + ret, PAGE_SIZE - ret, | |
97 | "TxFS input, "); | |
98 | ||
af4872fb | 99 | if (ptcr & IMX_AUDMUX_V2_PTCR_TCLKDIR) |
7b4e08a7 MB |
100 | ret += snprintf(buf + ret, PAGE_SIZE - ret, |
101 | "TxClk output from %s", | |
102 | audmux_port_string((ptcr >> 22) & 0x7)); | |
103 | else | |
104 | ret += snprintf(buf + ret, PAGE_SIZE - ret, | |
105 | "TxClk input"); | |
106 | ||
107 | ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n"); | |
108 | ||
af4872fb | 109 | if (ptcr & IMX_AUDMUX_V2_PTCR_SYN) { |
7b4e08a7 MB |
110 | ret += snprintf(buf + ret, PAGE_SIZE - ret, |
111 | "Port is symmetric"); | |
112 | } else { | |
af4872fb | 113 | if (ptcr & IMX_AUDMUX_V2_PTCR_RFSDIR) |
7b4e08a7 MB |
114 | ret += snprintf(buf + ret, PAGE_SIZE - ret, |
115 | "RxFS output from %s, ", | |
116 | audmux_port_string((ptcr >> 17) & 0x7)); | |
117 | else | |
118 | ret += snprintf(buf + ret, PAGE_SIZE - ret, | |
119 | "RxFS input, "); | |
120 | ||
af4872fb | 121 | if (ptcr & IMX_AUDMUX_V2_PTCR_RCLKDIR) |
7b4e08a7 MB |
122 | ret += snprintf(buf + ret, PAGE_SIZE - ret, |
123 | "RxClk output from %s", | |
124 | audmux_port_string((ptcr >> 12) & 0x7)); | |
125 | else | |
126 | ret += snprintf(buf + ret, PAGE_SIZE - ret, | |
127 | "RxClk input"); | |
128 | } | |
129 | ||
130 | ret += snprintf(buf + ret, PAGE_SIZE - ret, | |
131 | "\nData received from %s\n", | |
132 | audmux_port_string((pdcr >> 13) & 0x7)); | |
133 | ||
134 | ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); | |
135 | ||
136 | kfree(buf); | |
137 | ||
138 | return ret; | |
139 | } | |
140 | ||
141 | static const struct file_operations audmux_debugfs_fops = { | |
234e3405 | 142 | .open = simple_open, |
7b4e08a7 | 143 | .read = audmux_read_file, |
6038f373 | 144 | .llseek = default_llseek, |
7b4e08a7 MB |
145 | }; |
146 | ||
3bc34a61 | 147 | static void __init audmux_debugfs_init(void) |
7b4e08a7 MB |
148 | { |
149 | int i; | |
150 | char buf[20]; | |
151 | ||
152 | audmux_debugfs_root = debugfs_create_dir("audmux", NULL); | |
153 | if (!audmux_debugfs_root) { | |
154 | pr_warning("Failed to create AUDMUX debugfs root\n"); | |
155 | return; | |
156 | } | |
157 | ||
409b78cc | 158 | for (i = 0; i < MX31_AUDMUX_PORT7_SSI_PINS_7 + 1; i++) { |
7b4e08a7 MB |
159 | snprintf(buf, sizeof(buf), "ssi%d", i); |
160 | if (!debugfs_create_file(buf, 0444, audmux_debugfs_root, | |
161 | (void *)i, &audmux_debugfs_fops)) | |
162 | pr_warning("Failed to create AUDMUX port %d debugfs file\n", | |
163 | i); | |
164 | } | |
165 | } | |
3bc34a61 | 166 | |
a0a3d518 | 167 | static void audmux_debugfs_remove(void) |
3bc34a61 RZ |
168 | { |
169 | debugfs_remove_recursive(audmux_debugfs_root); | |
170 | } | |
7b4e08a7 MB |
171 | #else |
172 | static inline void audmux_debugfs_init(void) | |
173 | { | |
174 | } | |
3bc34a61 RZ |
175 | |
176 | static inline void audmux_debugfs_remove(void) | |
177 | { | |
178 | } | |
7b4e08a7 MB |
179 | #endif |
180 | ||
a10807ae | 181 | static enum imx_audmux_type { |
3bc34a61 RZ |
182 | IMX21_AUDMUX, |
183 | IMX31_AUDMUX, | |
184 | } audmux_type; | |
185 | ||
186 | static struct platform_device_id imx_audmux_ids[] = { | |
187 | { | |
188 | .name = "imx21-audmux", | |
189 | .driver_data = IMX21_AUDMUX, | |
190 | }, { | |
191 | .name = "imx31-audmux", | |
192 | .driver_data = IMX31_AUDMUX, | |
193 | }, { | |
194 | /* sentinel */ | |
195 | } | |
196 | }; | |
197 | MODULE_DEVICE_TABLE(platform, imx_audmux_ids); | |
198 | ||
9d5ef266 RZ |
199 | static const struct of_device_id imx_audmux_dt_ids[] = { |
200 | { .compatible = "fsl,imx21-audmux", .data = &imx_audmux_ids[0], }, | |
201 | { .compatible = "fsl,imx31-audmux", .data = &imx_audmux_ids[1], }, | |
202 | { /* sentinel */ } | |
203 | }; | |
204 | MODULE_DEVICE_TABLE(of, imx_audmux_dt_ids); | |
205 | ||
2405fc97 SG |
206 | static const uint8_t port_mapping[] = { |
207 | 0x0, 0x4, 0x8, 0x10, 0x14, 0x1c, | |
208 | }; | |
209 | ||
af4872fb | 210 | int imx_audmux_v1_configure_port(unsigned int port, unsigned int pcr) |
2405fc97 | 211 | { |
3bc34a61 RZ |
212 | if (audmux_type != IMX21_AUDMUX) |
213 | return -EINVAL; | |
214 | ||
2405fc97 SG |
215 | if (!audmux_base) |
216 | return -ENOSYS; | |
217 | ||
218 | if (port >= ARRAY_SIZE(port_mapping)) | |
219 | return -EINVAL; | |
220 | ||
221 | writel(pcr, audmux_base + port_mapping[port]); | |
222 | ||
223 | return 0; | |
224 | } | |
af4872fb | 225 | EXPORT_SYMBOL_GPL(imx_audmux_v1_configure_port); |
2405fc97 | 226 | |
af4872fb | 227 | int imx_audmux_v2_configure_port(unsigned int port, unsigned int ptcr, |
9eedbdf1 SH |
228 | unsigned int pdcr) |
229 | { | |
72192366 FE |
230 | int ret; |
231 | ||
3bc34a61 RZ |
232 | if (audmux_type != IMX31_AUDMUX) |
233 | return -EINVAL; | |
234 | ||
9eedbdf1 SH |
235 | if (!audmux_base) |
236 | return -ENOSYS; | |
237 | ||
72192366 FE |
238 | if (audmux_clk) { |
239 | ret = clk_prepare_enable(audmux_clk); | |
240 | if (ret) | |
241 | return ret; | |
242 | } | |
9eedbdf1 | 243 | |
af4872fb SG |
244 | writel(ptcr, audmux_base + IMX_AUDMUX_V2_PTCR(port)); |
245 | writel(pdcr, audmux_base + IMX_AUDMUX_V2_PDCR(port)); | |
9eedbdf1 SH |
246 | |
247 | if (audmux_clk) | |
bac59328 | 248 | clk_disable_unprepare(audmux_clk); |
9eedbdf1 SH |
249 | |
250 | return 0; | |
251 | } | |
af4872fb | 252 | EXPORT_SYMBOL_GPL(imx_audmux_v2_configure_port); |
9eedbdf1 | 253 | |
8548a464 MP |
254 | static int imx_audmux_parse_dt_defaults(struct platform_device *pdev, |
255 | struct device_node *of_node) | |
256 | { | |
257 | struct device_node *child; | |
258 | ||
259 | for_each_available_child_of_node(of_node, child) { | |
260 | unsigned int port; | |
261 | unsigned int ptcr = 0; | |
262 | unsigned int pdcr = 0; | |
263 | unsigned int pcr = 0; | |
264 | unsigned int val; | |
265 | int ret; | |
266 | int i = 0; | |
267 | ||
268 | ret = of_property_read_u32(child, "fsl,audmux-port", &port); | |
269 | if (ret) { | |
270 | dev_warn(&pdev->dev, "Failed to get fsl,audmux-port of child node \"%s\"\n", | |
271 | child->full_name); | |
272 | continue; | |
273 | } | |
274 | if (!of_property_read_bool(child, "fsl,port-config")) { | |
275 | dev_warn(&pdev->dev, "child node \"%s\" does not have property fsl,port-config\n", | |
276 | child->full_name); | |
277 | continue; | |
278 | } | |
279 | ||
280 | for (i = 0; (ret = of_property_read_u32_index(child, | |
9c0aeaa3 | 281 | "fsl,port-config", i, &val)) == 0; |
8548a464 MP |
282 | ++i) { |
283 | if (audmux_type == IMX31_AUDMUX) { | |
284 | if (i % 2) | |
285 | pdcr |= val; | |
286 | else | |
287 | ptcr |= val; | |
288 | } else { | |
289 | pcr |= val; | |
290 | } | |
291 | } | |
292 | ||
9c0aeaa3 | 293 | if (ret != -EOVERFLOW) { |
8548a464 MP |
294 | dev_err(&pdev->dev, "Failed to read u32 at index %d of child %s\n", |
295 | i, child->full_name); | |
296 | continue; | |
297 | } | |
298 | ||
299 | if (audmux_type == IMX31_AUDMUX) { | |
300 | if (i % 2) { | |
301 | dev_err(&pdev->dev, "One pdcr value is missing in child node %s\n", | |
302 | child->full_name); | |
303 | continue; | |
304 | } | |
305 | imx_audmux_v2_configure_port(port, ptcr, pdcr); | |
306 | } else { | |
307 | imx_audmux_v1_configure_port(port, pcr); | |
308 | } | |
309 | } | |
310 | ||
311 | return 0; | |
312 | } | |
313 | ||
a0a3d518 | 314 | static int imx_audmux_probe(struct platform_device *pdev) |
9eedbdf1 | 315 | { |
3bc34a61 | 316 | struct resource *res; |
9d5ef266 RZ |
317 | const struct of_device_id *of_id = |
318 | of_match_device(imx_audmux_dt_ids, &pdev->dev); | |
3bc34a61 RZ |
319 | |
320 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
b25b5aa0 TR |
321 | audmux_base = devm_ioremap_resource(&pdev->dev, res); |
322 | if (IS_ERR(audmux_base)) | |
323 | return PTR_ERR(audmux_base); | |
3bc34a61 | 324 | |
127c5cad | 325 | audmux_clk = devm_clk_get(&pdev->dev, "audmux"); |
3bc34a61 RZ |
326 | if (IS_ERR(audmux_clk)) { |
327 | dev_dbg(&pdev->dev, "cannot get clock: %ld\n", | |
328 | PTR_ERR(audmux_clk)); | |
329 | audmux_clk = NULL; | |
8402ed30 | 330 | } |
56c6b872 | 331 | |
9d5ef266 RZ |
332 | if (of_id) |
333 | pdev->id_entry = of_id->data; | |
3bc34a61 RZ |
334 | audmux_type = pdev->id_entry->driver_data; |
335 | if (audmux_type == IMX31_AUDMUX) | |
2405fc97 | 336 | audmux_debugfs_init(); |
7b4e08a7 | 337 | |
8548a464 MP |
338 | imx_audmux_parse_dt_defaults(pdev, pdev->dev.of_node); |
339 | ||
9eedbdf1 SH |
340 | return 0; |
341 | } | |
342 | ||
a0a3d518 | 343 | static int imx_audmux_remove(struct platform_device *pdev) |
3bc34a61 RZ |
344 | { |
345 | if (audmux_type == IMX31_AUDMUX) | |
346 | audmux_debugfs_remove(); | |
3bc34a61 RZ |
347 | |
348 | return 0; | |
349 | } | |
350 | ||
351 | static struct platform_driver imx_audmux_driver = { | |
352 | .probe = imx_audmux_probe, | |
a0a3d518 | 353 | .remove = imx_audmux_remove, |
3bc34a61 RZ |
354 | .id_table = imx_audmux_ids, |
355 | .driver = { | |
356 | .name = DRIVER_NAME, | |
357 | .owner = THIS_MODULE, | |
9d5ef266 | 358 | .of_match_table = imx_audmux_dt_ids, |
3bc34a61 RZ |
359 | } |
360 | }; | |
361 | ||
362 | static int __init imx_audmux_init(void) | |
363 | { | |
364 | return platform_driver_register(&imx_audmux_driver); | |
365 | } | |
366 | subsys_initcall(imx_audmux_init); | |
367 | ||
368 | static void __exit imx_audmux_exit(void) | |
369 | { | |
370 | platform_driver_unregister(&imx_audmux_driver); | |
371 | } | |
372 | module_exit(imx_audmux_exit); | |
373 | ||
374 | MODULE_DESCRIPTION("Freescale i.MX AUDMUX driver"); | |
375 | MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>"); | |
376 | MODULE_LICENSE("GPL v2"); | |
377 | MODULE_ALIAS("platform:" DRIVER_NAME); |