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47bbcbfe AD |
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, http://www.phytec.de | |
9eedbdf1 | 9 | |
9eedbdf1 | 10 | #include <linux/clk.h> |
7b4e08a7 | 11 | #include <linux/debugfs.h> |
3bc34a61 RZ |
12 | #include <linux/err.h> |
13 | #include <linux/io.h> | |
14 | #include <linux/module.h> | |
9d5ef266 RZ |
15 | #include <linux/of.h> |
16 | #include <linux/of_device.h> | |
3bc34a61 | 17 | #include <linux/platform_device.h> |
5a0e3ad6 | 18 | #include <linux/slab.h> |
3c77c29c SG |
19 | |
20 | #include "imx-audmux.h" | |
3bc34a61 RZ |
21 | |
22 | #define DRIVER_NAME "imx-audmux" | |
9eedbdf1 SH |
23 | |
24 | static struct clk *audmux_clk; | |
25 | static void __iomem *audmux_base; | |
26 | ||
af4872fb SG |
27 | #define IMX_AUDMUX_V2_PTCR(x) ((x) * 8) |
28 | #define IMX_AUDMUX_V2_PDCR(x) ((x) * 8 + 4) | |
9eedbdf1 | 29 | |
7b4e08a7 MB |
30 | #ifdef CONFIG_DEBUG_FS |
31 | static struct dentry *audmux_debugfs_root; | |
32 | ||
7b4e08a7 MB |
33 | /* There is an annoying discontinuity in the SSI numbering with regard |
34 | * to the Linux number of the devices */ | |
35 | static 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 | ||
55 | static ssize_t audmux_read_file(struct file *file, char __user *user_buf, | |
56 | size_t count, loff_t *ppos) | |
57 | { | |
58 | ssize_t ret; | |
1b3ed70a | 59 | char *buf; |
e5f89768 | 60 | uintptr_t port = (uintptr_t)file->private_data; |
7b4e08a7 MB |
61 | u32 pdcr, ptcr; |
62 | ||
72192366 FE |
63 | if (audmux_clk) { |
64 | ret = clk_prepare_enable(audmux_clk); | |
65 | if (ret) | |
66 | return ret; | |
67 | } | |
7b4e08a7 | 68 | |
af4872fb SG |
69 | ptcr = readl(audmux_base + IMX_AUDMUX_V2_PTCR(port)); |
70 | pdcr = readl(audmux_base + IMX_AUDMUX_V2_PDCR(port)); | |
7b4e08a7 MB |
71 | |
72 | if (audmux_clk) | |
bac59328 | 73 | clk_disable_unprepare(audmux_clk); |
7b4e08a7 | 74 | |
1b3ed70a FP |
75 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); |
76 | if (!buf) | |
77 | return -ENOMEM; | |
78 | ||
c407cd00 | 79 | ret = scnprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n", |
7b4e08a7 MB |
80 | pdcr, ptcr); |
81 | ||
af4872fb | 82 | if (ptcr & IMX_AUDMUX_V2_PTCR_TFSDIR) |
c407cd00 | 83 | ret += scnprintf(buf + ret, PAGE_SIZE - ret, |
7b4e08a7 MB |
84 | "TxFS output from %s, ", |
85 | audmux_port_string((ptcr >> 27) & 0x7)); | |
86 | else | |
c407cd00 | 87 | ret += scnprintf(buf + ret, PAGE_SIZE - ret, |
7b4e08a7 MB |
88 | "TxFS input, "); |
89 | ||
af4872fb | 90 | if (ptcr & IMX_AUDMUX_V2_PTCR_TCLKDIR) |
c407cd00 | 91 | ret += scnprintf(buf + ret, PAGE_SIZE - ret, |
7b4e08a7 MB |
92 | "TxClk output from %s", |
93 | audmux_port_string((ptcr >> 22) & 0x7)); | |
94 | else | |
c407cd00 | 95 | ret += scnprintf(buf + ret, PAGE_SIZE - ret, |
7b4e08a7 MB |
96 | "TxClk input"); |
97 | ||
c407cd00 | 98 | ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n"); |
7b4e08a7 | 99 | |
af4872fb | 100 | if (ptcr & IMX_AUDMUX_V2_PTCR_SYN) { |
c407cd00 | 101 | ret += scnprintf(buf + ret, PAGE_SIZE - ret, |
7b4e08a7 MB |
102 | "Port is symmetric"); |
103 | } else { | |
af4872fb | 104 | if (ptcr & IMX_AUDMUX_V2_PTCR_RFSDIR) |
c407cd00 | 105 | ret += scnprintf(buf + ret, PAGE_SIZE - ret, |
7b4e08a7 MB |
106 | "RxFS output from %s, ", |
107 | audmux_port_string((ptcr >> 17) & 0x7)); | |
108 | else | |
c407cd00 | 109 | ret += scnprintf(buf + ret, PAGE_SIZE - ret, |
7b4e08a7 MB |
110 | "RxFS input, "); |
111 | ||
af4872fb | 112 | if (ptcr & IMX_AUDMUX_V2_PTCR_RCLKDIR) |
c407cd00 | 113 | ret += scnprintf(buf + ret, PAGE_SIZE - ret, |
7b4e08a7 MB |
114 | "RxClk output from %s", |
115 | audmux_port_string((ptcr >> 12) & 0x7)); | |
116 | else | |
c407cd00 | 117 | ret += scnprintf(buf + ret, PAGE_SIZE - ret, |
7b4e08a7 MB |
118 | "RxClk input"); |
119 | } | |
120 | ||
c407cd00 | 121 | ret += scnprintf(buf + ret, PAGE_SIZE - ret, |
7b4e08a7 MB |
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 | ||
132 | static const struct file_operations audmux_debugfs_fops = { | |
234e3405 | 133 | .open = simple_open, |
7b4e08a7 | 134 | .read = audmux_read_file, |
6038f373 | 135 | .llseek = default_llseek, |
7b4e08a7 MB |
136 | }; |
137 | ||
b8909783 | 138 | static void audmux_debugfs_init(void) |
7b4e08a7 | 139 | { |
e5f89768 | 140 | uintptr_t i; |
7b4e08a7 MB |
141 | char buf[20]; |
142 | ||
143 | audmux_debugfs_root = debugfs_create_dir("audmux", NULL); | |
144 | if (!audmux_debugfs_root) { | |
145 | pr_warning("Failed to create AUDMUX debugfs root\n"); | |
146 | return; | |
147 | } | |
148 | ||
409b78cc | 149 | for (i = 0; i < MX31_AUDMUX_PORT7_SSI_PINS_7 + 1; i++) { |
e5f89768 | 150 | snprintf(buf, sizeof(buf), "ssi%lu", i); |
7b4e08a7 MB |
151 | if (!debugfs_create_file(buf, 0444, audmux_debugfs_root, |
152 | (void *)i, &audmux_debugfs_fops)) | |
e5f89768 | 153 | pr_warning("Failed to create AUDMUX port %lu debugfs file\n", |
7b4e08a7 MB |
154 | i); |
155 | } | |
156 | } | |
3bc34a61 | 157 | |
a0a3d518 | 158 | static void audmux_debugfs_remove(void) |
3bc34a61 RZ |
159 | { |
160 | debugfs_remove_recursive(audmux_debugfs_root); | |
161 | } | |
7b4e08a7 MB |
162 | #else |
163 | static inline void audmux_debugfs_init(void) | |
164 | { | |
165 | } | |
3bc34a61 RZ |
166 | |
167 | static inline void audmux_debugfs_remove(void) | |
168 | { | |
169 | } | |
7b4e08a7 MB |
170 | #endif |
171 | ||
a10807ae | 172 | static enum imx_audmux_type { |
3bc34a61 RZ |
173 | IMX21_AUDMUX, |
174 | IMX31_AUDMUX, | |
175 | } audmux_type; | |
176 | ||
e51cebf7 | 177 | static const struct platform_device_id imx_audmux_ids[] = { |
3bc34a61 RZ |
178 | { |
179 | .name = "imx21-audmux", | |
180 | .driver_data = IMX21_AUDMUX, | |
181 | }, { | |
182 | .name = "imx31-audmux", | |
183 | .driver_data = IMX31_AUDMUX, | |
184 | }, { | |
185 | /* sentinel */ | |
186 | } | |
187 | }; | |
188 | MODULE_DEVICE_TABLE(platform, imx_audmux_ids); | |
189 | ||
9d5ef266 RZ |
190 | static const struct of_device_id imx_audmux_dt_ids[] = { |
191 | { .compatible = "fsl,imx21-audmux", .data = &imx_audmux_ids[0], }, | |
192 | { .compatible = "fsl,imx31-audmux", .data = &imx_audmux_ids[1], }, | |
193 | { /* sentinel */ } | |
194 | }; | |
195 | MODULE_DEVICE_TABLE(of, imx_audmux_dt_ids); | |
196 | ||
2405fc97 SG |
197 | static const uint8_t port_mapping[] = { |
198 | 0x0, 0x4, 0x8, 0x10, 0x14, 0x1c, | |
199 | }; | |
200 | ||
af4872fb | 201 | int imx_audmux_v1_configure_port(unsigned int port, unsigned int pcr) |
2405fc97 | 202 | { |
3bc34a61 RZ |
203 | if (audmux_type != IMX21_AUDMUX) |
204 | return -EINVAL; | |
205 | ||
2405fc97 SG |
206 | if (!audmux_base) |
207 | return -ENOSYS; | |
208 | ||
209 | if (port >= ARRAY_SIZE(port_mapping)) | |
210 | return -EINVAL; | |
211 | ||
212 | writel(pcr, audmux_base + port_mapping[port]); | |
213 | ||
214 | return 0; | |
215 | } | |
af4872fb | 216 | EXPORT_SYMBOL_GPL(imx_audmux_v1_configure_port); |
2405fc97 | 217 | |
af4872fb | 218 | int imx_audmux_v2_configure_port(unsigned int port, unsigned int ptcr, |
9eedbdf1 SH |
219 | unsigned int pdcr) |
220 | { | |
72192366 FE |
221 | int ret; |
222 | ||
3bc34a61 RZ |
223 | if (audmux_type != IMX31_AUDMUX) |
224 | return -EINVAL; | |
225 | ||
9eedbdf1 SH |
226 | if (!audmux_base) |
227 | return -ENOSYS; | |
228 | ||
72192366 FE |
229 | if (audmux_clk) { |
230 | ret = clk_prepare_enable(audmux_clk); | |
231 | if (ret) | |
232 | return ret; | |
233 | } | |
9eedbdf1 | 234 | |
af4872fb SG |
235 | writel(ptcr, audmux_base + IMX_AUDMUX_V2_PTCR(port)); |
236 | writel(pdcr, audmux_base + IMX_AUDMUX_V2_PDCR(port)); | |
9eedbdf1 SH |
237 | |
238 | if (audmux_clk) | |
bac59328 | 239 | clk_disable_unprepare(audmux_clk); |
9eedbdf1 SH |
240 | |
241 | return 0; | |
242 | } | |
af4872fb | 243 | EXPORT_SYMBOL_GPL(imx_audmux_v2_configure_port); |
9eedbdf1 | 244 | |
8548a464 MP |
245 | static int imx_audmux_parse_dt_defaults(struct platform_device *pdev, |
246 | struct device_node *of_node) | |
247 | { | |
248 | struct device_node *child; | |
249 | ||
250 | for_each_available_child_of_node(of_node, child) { | |
251 | unsigned int port; | |
252 | unsigned int ptcr = 0; | |
253 | unsigned int pdcr = 0; | |
254 | unsigned int pcr = 0; | |
255 | unsigned int val; | |
256 | int ret; | |
257 | int i = 0; | |
258 | ||
259 | ret = of_property_read_u32(child, "fsl,audmux-port", &port); | |
260 | if (ret) { | |
06d15a2e RH |
261 | dev_warn(&pdev->dev, "Failed to get fsl,audmux-port of child node \"%pOF\"\n", |
262 | child); | |
8548a464 MP |
263 | continue; |
264 | } | |
265 | if (!of_property_read_bool(child, "fsl,port-config")) { | |
06d15a2e RH |
266 | dev_warn(&pdev->dev, "child node \"%pOF\" does not have property fsl,port-config\n", |
267 | child); | |
8548a464 MP |
268 | continue; |
269 | } | |
270 | ||
271 | for (i = 0; (ret = of_property_read_u32_index(child, | |
9c0aeaa3 | 272 | "fsl,port-config", i, &val)) == 0; |
8548a464 MP |
273 | ++i) { |
274 | if (audmux_type == IMX31_AUDMUX) { | |
275 | if (i % 2) | |
276 | pdcr |= val; | |
277 | else | |
278 | ptcr |= val; | |
279 | } else { | |
280 | pcr |= val; | |
281 | } | |
282 | } | |
283 | ||
9c0aeaa3 | 284 | if (ret != -EOVERFLOW) { |
06d15a2e RH |
285 | dev_err(&pdev->dev, "Failed to read u32 at index %d of child %pOF\n", |
286 | i, child); | |
8548a464 MP |
287 | continue; |
288 | } | |
289 | ||
290 | if (audmux_type == IMX31_AUDMUX) { | |
291 | if (i % 2) { | |
06d15a2e RH |
292 | dev_err(&pdev->dev, "One pdcr value is missing in child node %pOF\n", |
293 | child); | |
8548a464 MP |
294 | continue; |
295 | } | |
296 | imx_audmux_v2_configure_port(port, ptcr, pdcr); | |
297 | } else { | |
298 | imx_audmux_v1_configure_port(port, pcr); | |
299 | } | |
300 | } | |
301 | ||
302 | return 0; | |
303 | } | |
304 | ||
a0a3d518 | 305 | static int imx_audmux_probe(struct platform_device *pdev) |
9eedbdf1 | 306 | { |
3bc34a61 | 307 | struct resource *res; |
9d5ef266 RZ |
308 | const struct of_device_id *of_id = |
309 | of_match_device(imx_audmux_dt_ids, &pdev->dev); | |
3bc34a61 RZ |
310 | |
311 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
b25b5aa0 TR |
312 | audmux_base = devm_ioremap_resource(&pdev->dev, res); |
313 | if (IS_ERR(audmux_base)) | |
314 | return PTR_ERR(audmux_base); | |
3bc34a61 | 315 | |
127c5cad | 316 | audmux_clk = devm_clk_get(&pdev->dev, "audmux"); |
3bc34a61 RZ |
317 | if (IS_ERR(audmux_clk)) { |
318 | dev_dbg(&pdev->dev, "cannot get clock: %ld\n", | |
319 | PTR_ERR(audmux_clk)); | |
320 | audmux_clk = NULL; | |
8402ed30 | 321 | } |
56c6b872 | 322 | |
9d5ef266 RZ |
323 | if (of_id) |
324 | pdev->id_entry = of_id->data; | |
3bc34a61 RZ |
325 | audmux_type = pdev->id_entry->driver_data; |
326 | if (audmux_type == IMX31_AUDMUX) | |
2405fc97 | 327 | audmux_debugfs_init(); |
7b4e08a7 | 328 | |
bae35992 FE |
329 | if (of_id) |
330 | imx_audmux_parse_dt_defaults(pdev, pdev->dev.of_node); | |
8548a464 | 331 | |
9eedbdf1 SH |
332 | return 0; |
333 | } | |
334 | ||
a0a3d518 | 335 | static int imx_audmux_remove(struct platform_device *pdev) |
3bc34a61 RZ |
336 | { |
337 | if (audmux_type == IMX31_AUDMUX) | |
338 | audmux_debugfs_remove(); | |
3bc34a61 RZ |
339 | |
340 | return 0; | |
341 | } | |
342 | ||
343 | static struct platform_driver imx_audmux_driver = { | |
344 | .probe = imx_audmux_probe, | |
a0a3d518 | 345 | .remove = imx_audmux_remove, |
3bc34a61 RZ |
346 | .id_table = imx_audmux_ids, |
347 | .driver = { | |
348 | .name = DRIVER_NAME, | |
9d5ef266 | 349 | .of_match_table = imx_audmux_dt_ids, |
3bc34a61 RZ |
350 | } |
351 | }; | |
352 | ||
353 | static int __init imx_audmux_init(void) | |
354 | { | |
355 | return platform_driver_register(&imx_audmux_driver); | |
356 | } | |
357 | subsys_initcall(imx_audmux_init); | |
358 | ||
359 | static void __exit imx_audmux_exit(void) | |
360 | { | |
361 | platform_driver_unregister(&imx_audmux_driver); | |
362 | } | |
363 | module_exit(imx_audmux_exit); | |
364 | ||
365 | MODULE_DESCRIPTION("Freescale i.MX AUDMUX driver"); | |
366 | MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>"); | |
367 | MODULE_LICENSE("GPL v2"); | |
368 | MODULE_ALIAS("platform:" DRIVER_NAME); |