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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> |
a1c85ec0 | 29 | #include <linux/pinctrl/consumer.h> |
3c77c29c SG |
30 | |
31 | #include "imx-audmux.h" | |
3bc34a61 RZ |
32 | |
33 | #define DRIVER_NAME "imx-audmux" | |
9eedbdf1 SH |
34 | |
35 | static struct clk *audmux_clk; | |
36 | static void __iomem *audmux_base; | |
37 | ||
af4872fb SG |
38 | #define IMX_AUDMUX_V2_PTCR(x) ((x) * 8) |
39 | #define IMX_AUDMUX_V2_PDCR(x) ((x) * 8 + 4) | |
9eedbdf1 | 40 | |
7b4e08a7 MB |
41 | #ifdef CONFIG_DEBUG_FS |
42 | static struct dentry *audmux_debugfs_root; | |
43 | ||
7b4e08a7 MB |
44 | /* There is an annoying discontinuity in the SSI numbering with regard |
45 | * to the Linux number of the devices */ | |
46 | static const char *audmux_port_string(int port) | |
47 | { | |
48 | switch (port) { | |
49 | case MX31_AUDMUX_PORT1_SSI0: | |
50 | return "imx-ssi.0"; | |
51 | case MX31_AUDMUX_PORT2_SSI1: | |
52 | return "imx-ssi.1"; | |
53 | case MX31_AUDMUX_PORT3_SSI_PINS_3: | |
54 | return "SSI3"; | |
55 | case MX31_AUDMUX_PORT4_SSI_PINS_4: | |
56 | return "SSI4"; | |
57 | case MX31_AUDMUX_PORT5_SSI_PINS_5: | |
58 | return "SSI5"; | |
59 | case MX31_AUDMUX_PORT6_SSI_PINS_6: | |
60 | return "SSI6"; | |
61 | default: | |
62 | return "UNKNOWN"; | |
63 | } | |
64 | } | |
65 | ||
66 | static ssize_t audmux_read_file(struct file *file, char __user *user_buf, | |
67 | size_t count, loff_t *ppos) | |
68 | { | |
69 | ssize_t ret; | |
70 | char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
71 | int port = (int)file->private_data; | |
72 | u32 pdcr, ptcr; | |
73 | ||
74 | if (!buf) | |
75 | return -ENOMEM; | |
76 | ||
66bb2a7f FE |
77 | if (!audmux_base) |
78 | return -ENOSYS; | |
79 | ||
7b4e08a7 | 80 | if (audmux_clk) |
bac59328 | 81 | clk_prepare_enable(audmux_clk); |
7b4e08a7 | 82 | |
af4872fb SG |
83 | ptcr = readl(audmux_base + IMX_AUDMUX_V2_PTCR(port)); |
84 | pdcr = readl(audmux_base + IMX_AUDMUX_V2_PDCR(port)); | |
7b4e08a7 MB |
85 | |
86 | if (audmux_clk) | |
bac59328 | 87 | clk_disable_unprepare(audmux_clk); |
7b4e08a7 MB |
88 | |
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 | ||
3bc34a61 | 148 | static void __init audmux_debugfs_init(void) |
7b4e08a7 MB |
149 | { |
150 | int 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 | ||
00792ac4 | 159 | for (i = 0; i < MX31_AUDMUX_PORT6_SSI_PINS_6 + 1; i++) { |
7b4e08a7 MB |
160 | snprintf(buf, sizeof(buf), "ssi%d", 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 %d debugfs file\n", | |
164 | i); | |
165 | } | |
166 | } | |
3bc34a61 | 167 | |
fb97624a | 168 | static void __devexit 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 | ||
3bc34a61 RZ |
182 | enum imx_audmux_type { |
183 | IMX21_AUDMUX, | |
184 | IMX31_AUDMUX, | |
185 | } audmux_type; | |
186 | ||
187 | static 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 | /* 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 | { | |
3bc34a61 RZ |
231 | if (audmux_type != IMX31_AUDMUX) |
232 | return -EINVAL; | |
233 | ||
9eedbdf1 SH |
234 | if (!audmux_base) |
235 | return -ENOSYS; | |
236 | ||
237 | if (audmux_clk) | |
bac59328 | 238 | clk_prepare_enable(audmux_clk); |
9eedbdf1 | 239 | |
af4872fb SG |
240 | writel(ptcr, audmux_base + IMX_AUDMUX_V2_PTCR(port)); |
241 | writel(pdcr, audmux_base + IMX_AUDMUX_V2_PDCR(port)); | |
9eedbdf1 SH |
242 | |
243 | if (audmux_clk) | |
bac59328 | 244 | clk_disable_unprepare(audmux_clk); |
9eedbdf1 SH |
245 | |
246 | return 0; | |
247 | } | |
af4872fb | 248 | EXPORT_SYMBOL_GPL(imx_audmux_v2_configure_port); |
9eedbdf1 | 249 | |
fb97624a | 250 | static int __devinit imx_audmux_probe(struct platform_device *pdev) |
9eedbdf1 | 251 | { |
3bc34a61 | 252 | struct resource *res; |
a1c85ec0 | 253 | struct pinctrl *pinctrl; |
9d5ef266 RZ |
254 | const struct of_device_id *of_id = |
255 | of_match_device(imx_audmux_dt_ids, &pdev->dev); | |
3bc34a61 RZ |
256 | |
257 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
258 | audmux_base = devm_request_and_ioremap(&pdev->dev, res); | |
259 | if (!audmux_base) | |
260 | return -EADDRNOTAVAIL; | |
261 | ||
a1c85ec0 RZ |
262 | pinctrl = devm_pinctrl_get_select_default(&pdev->dev); |
263 | if (IS_ERR(pinctrl)) { | |
264 | dev_err(&pdev->dev, "setup pinctrl failed!"); | |
265 | return PTR_ERR(pinctrl); | |
266 | } | |
267 | ||
3bc34a61 RZ |
268 | audmux_clk = clk_get(&pdev->dev, "audmux"); |
269 | if (IS_ERR(audmux_clk)) { | |
270 | dev_dbg(&pdev->dev, "cannot get clock: %ld\n", | |
271 | PTR_ERR(audmux_clk)); | |
272 | audmux_clk = NULL; | |
8402ed30 | 273 | } |
56c6b872 | 274 | |
9d5ef266 RZ |
275 | if (of_id) |
276 | pdev->id_entry = of_id->data; | |
3bc34a61 RZ |
277 | audmux_type = pdev->id_entry->driver_data; |
278 | if (audmux_type == IMX31_AUDMUX) | |
2405fc97 | 279 | audmux_debugfs_init(); |
7b4e08a7 | 280 | |
9eedbdf1 SH |
281 | return 0; |
282 | } | |
283 | ||
fb97624a | 284 | static int __devexit imx_audmux_remove(struct platform_device *pdev) |
3bc34a61 RZ |
285 | { |
286 | if (audmux_type == IMX31_AUDMUX) | |
287 | audmux_debugfs_remove(); | |
288 | clk_put(audmux_clk); | |
289 | ||
290 | return 0; | |
291 | } | |
292 | ||
293 | static struct platform_driver imx_audmux_driver = { | |
294 | .probe = imx_audmux_probe, | |
fb97624a | 295 | .remove = __devexit_p(imx_audmux_remove), |
3bc34a61 RZ |
296 | .id_table = imx_audmux_ids, |
297 | .driver = { | |
298 | .name = DRIVER_NAME, | |
299 | .owner = THIS_MODULE, | |
9d5ef266 | 300 | .of_match_table = imx_audmux_dt_ids, |
3bc34a61 RZ |
301 | } |
302 | }; | |
303 | ||
304 | static int __init imx_audmux_init(void) | |
305 | { | |
306 | return platform_driver_register(&imx_audmux_driver); | |
307 | } | |
308 | subsys_initcall(imx_audmux_init); | |
309 | ||
310 | static void __exit imx_audmux_exit(void) | |
311 | { | |
312 | platform_driver_unregister(&imx_audmux_driver); | |
313 | } | |
314 | module_exit(imx_audmux_exit); | |
315 | ||
316 | MODULE_DESCRIPTION("Freescale i.MX AUDMUX driver"); | |
317 | MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>"); | |
318 | MODULE_LICENSE("GPL v2"); | |
319 | MODULE_ALIAS("platform:" DRIVER_NAME); |