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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 | ||
77 | if (audmux_clk) | |
bac59328 | 78 | clk_prepare_enable(audmux_clk); |
7b4e08a7 | 79 | |
af4872fb SG |
80 | ptcr = readl(audmux_base + IMX_AUDMUX_V2_PTCR(port)); |
81 | pdcr = readl(audmux_base + IMX_AUDMUX_V2_PDCR(port)); | |
7b4e08a7 MB |
82 | |
83 | if (audmux_clk) | |
bac59328 | 84 | clk_disable_unprepare(audmux_clk); |
7b4e08a7 MB |
85 | |
86 | ret = snprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n", | |
87 | pdcr, ptcr); | |
88 | ||
af4872fb | 89 | if (ptcr & IMX_AUDMUX_V2_PTCR_TFSDIR) |
7b4e08a7 MB |
90 | ret += snprintf(buf + ret, PAGE_SIZE - ret, |
91 | "TxFS output from %s, ", | |
92 | audmux_port_string((ptcr >> 27) & 0x7)); | |
93 | else | |
94 | ret += snprintf(buf + ret, PAGE_SIZE - ret, | |
95 | "TxFS input, "); | |
96 | ||
af4872fb | 97 | if (ptcr & IMX_AUDMUX_V2_PTCR_TCLKDIR) |
7b4e08a7 MB |
98 | ret += snprintf(buf + ret, PAGE_SIZE - ret, |
99 | "TxClk output from %s", | |
100 | audmux_port_string((ptcr >> 22) & 0x7)); | |
101 | else | |
102 | ret += snprintf(buf + ret, PAGE_SIZE - ret, | |
103 | "TxClk input"); | |
104 | ||
105 | ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n"); | |
106 | ||
af4872fb | 107 | if (ptcr & IMX_AUDMUX_V2_PTCR_SYN) { |
7b4e08a7 MB |
108 | ret += snprintf(buf + ret, PAGE_SIZE - ret, |
109 | "Port is symmetric"); | |
110 | } else { | |
af4872fb | 111 | if (ptcr & IMX_AUDMUX_V2_PTCR_RFSDIR) |
7b4e08a7 MB |
112 | ret += snprintf(buf + ret, PAGE_SIZE - ret, |
113 | "RxFS output from %s, ", | |
114 | audmux_port_string((ptcr >> 17) & 0x7)); | |
115 | else | |
116 | ret += snprintf(buf + ret, PAGE_SIZE - ret, | |
117 | "RxFS input, "); | |
118 | ||
af4872fb | 119 | if (ptcr & IMX_AUDMUX_V2_PTCR_RCLKDIR) |
7b4e08a7 MB |
120 | ret += snprintf(buf + ret, PAGE_SIZE - ret, |
121 | "RxClk output from %s", | |
122 | audmux_port_string((ptcr >> 12) & 0x7)); | |
123 | else | |
124 | ret += snprintf(buf + ret, PAGE_SIZE - ret, | |
125 | "RxClk input"); | |
126 | } | |
127 | ||
128 | ret += snprintf(buf + ret, PAGE_SIZE - ret, | |
129 | "\nData received from %s\n", | |
130 | audmux_port_string((pdcr >> 13) & 0x7)); | |
131 | ||
132 | ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); | |
133 | ||
134 | kfree(buf); | |
135 | ||
136 | return ret; | |
137 | } | |
138 | ||
139 | static const struct file_operations audmux_debugfs_fops = { | |
234e3405 | 140 | .open = simple_open, |
7b4e08a7 | 141 | .read = audmux_read_file, |
6038f373 | 142 | .llseek = default_llseek, |
7b4e08a7 MB |
143 | }; |
144 | ||
3bc34a61 | 145 | static void __init audmux_debugfs_init(void) |
7b4e08a7 MB |
146 | { |
147 | int i; | |
148 | char buf[20]; | |
149 | ||
150 | audmux_debugfs_root = debugfs_create_dir("audmux", NULL); | |
151 | if (!audmux_debugfs_root) { | |
152 | pr_warning("Failed to create AUDMUX debugfs root\n"); | |
153 | return; | |
154 | } | |
155 | ||
409b78cc | 156 | for (i = 0; i < MX31_AUDMUX_PORT7_SSI_PINS_7 + 1; i++) { |
7b4e08a7 MB |
157 | snprintf(buf, sizeof(buf), "ssi%d", i); |
158 | if (!debugfs_create_file(buf, 0444, audmux_debugfs_root, | |
159 | (void *)i, &audmux_debugfs_fops)) | |
160 | pr_warning("Failed to create AUDMUX port %d debugfs file\n", | |
161 | i); | |
162 | } | |
163 | } | |
3bc34a61 | 164 | |
a0a3d518 | 165 | static void audmux_debugfs_remove(void) |
3bc34a61 RZ |
166 | { |
167 | debugfs_remove_recursive(audmux_debugfs_root); | |
168 | } | |
7b4e08a7 MB |
169 | #else |
170 | static inline void audmux_debugfs_init(void) | |
171 | { | |
172 | } | |
3bc34a61 RZ |
173 | |
174 | static inline void audmux_debugfs_remove(void) | |
175 | { | |
176 | } | |
7b4e08a7 MB |
177 | #endif |
178 | ||
3bc34a61 RZ |
179 | enum imx_audmux_type { |
180 | IMX21_AUDMUX, | |
181 | IMX31_AUDMUX, | |
182 | } audmux_type; | |
183 | ||
184 | static struct platform_device_id imx_audmux_ids[] = { | |
185 | { | |
186 | .name = "imx21-audmux", | |
187 | .driver_data = IMX21_AUDMUX, | |
188 | }, { | |
189 | .name = "imx31-audmux", | |
190 | .driver_data = IMX31_AUDMUX, | |
191 | }, { | |
192 | /* sentinel */ | |
193 | } | |
194 | }; | |
195 | MODULE_DEVICE_TABLE(platform, imx_audmux_ids); | |
196 | ||
9d5ef266 RZ |
197 | static const struct of_device_id imx_audmux_dt_ids[] = { |
198 | { .compatible = "fsl,imx21-audmux", .data = &imx_audmux_ids[0], }, | |
199 | { .compatible = "fsl,imx31-audmux", .data = &imx_audmux_ids[1], }, | |
200 | { /* sentinel */ } | |
201 | }; | |
202 | MODULE_DEVICE_TABLE(of, imx_audmux_dt_ids); | |
203 | ||
2405fc97 SG |
204 | static const uint8_t port_mapping[] = { |
205 | 0x0, 0x4, 0x8, 0x10, 0x14, 0x1c, | |
206 | }; | |
207 | ||
af4872fb | 208 | int imx_audmux_v1_configure_port(unsigned int port, unsigned int pcr) |
2405fc97 | 209 | { |
3bc34a61 RZ |
210 | if (audmux_type != IMX21_AUDMUX) |
211 | return -EINVAL; | |
212 | ||
2405fc97 SG |
213 | if (!audmux_base) |
214 | return -ENOSYS; | |
215 | ||
216 | if (port >= ARRAY_SIZE(port_mapping)) | |
217 | return -EINVAL; | |
218 | ||
219 | writel(pcr, audmux_base + port_mapping[port]); | |
220 | ||
221 | return 0; | |
222 | } | |
af4872fb | 223 | EXPORT_SYMBOL_GPL(imx_audmux_v1_configure_port); |
2405fc97 | 224 | |
af4872fb | 225 | int imx_audmux_v2_configure_port(unsigned int port, unsigned int ptcr, |
9eedbdf1 SH |
226 | unsigned int pdcr) |
227 | { | |
3bc34a61 RZ |
228 | if (audmux_type != IMX31_AUDMUX) |
229 | return -EINVAL; | |
230 | ||
9eedbdf1 SH |
231 | if (!audmux_base) |
232 | return -ENOSYS; | |
233 | ||
234 | if (audmux_clk) | |
bac59328 | 235 | clk_prepare_enable(audmux_clk); |
9eedbdf1 | 236 | |
af4872fb SG |
237 | writel(ptcr, audmux_base + IMX_AUDMUX_V2_PTCR(port)); |
238 | writel(pdcr, audmux_base + IMX_AUDMUX_V2_PDCR(port)); | |
9eedbdf1 SH |
239 | |
240 | if (audmux_clk) | |
bac59328 | 241 | clk_disable_unprepare(audmux_clk); |
9eedbdf1 SH |
242 | |
243 | return 0; | |
244 | } | |
af4872fb | 245 | EXPORT_SYMBOL_GPL(imx_audmux_v2_configure_port); |
9eedbdf1 | 246 | |
a0a3d518 | 247 | static int imx_audmux_probe(struct platform_device *pdev) |
9eedbdf1 | 248 | { |
3bc34a61 | 249 | struct resource *res; |
a1c85ec0 | 250 | struct pinctrl *pinctrl; |
9d5ef266 RZ |
251 | const struct of_device_id *of_id = |
252 | of_match_device(imx_audmux_dt_ids, &pdev->dev); | |
3bc34a61 RZ |
253 | |
254 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
b25b5aa0 TR |
255 | audmux_base = devm_ioremap_resource(&pdev->dev, res); |
256 | if (IS_ERR(audmux_base)) | |
257 | return PTR_ERR(audmux_base); | |
3bc34a61 | 258 | |
a1c85ec0 RZ |
259 | pinctrl = devm_pinctrl_get_select_default(&pdev->dev); |
260 | if (IS_ERR(pinctrl)) { | |
261 | dev_err(&pdev->dev, "setup pinctrl failed!"); | |
262 | return PTR_ERR(pinctrl); | |
263 | } | |
264 | ||
3bc34a61 RZ |
265 | audmux_clk = clk_get(&pdev->dev, "audmux"); |
266 | if (IS_ERR(audmux_clk)) { | |
267 | dev_dbg(&pdev->dev, "cannot get clock: %ld\n", | |
268 | PTR_ERR(audmux_clk)); | |
269 | audmux_clk = NULL; | |
8402ed30 | 270 | } |
56c6b872 | 271 | |
9d5ef266 RZ |
272 | if (of_id) |
273 | pdev->id_entry = of_id->data; | |
3bc34a61 RZ |
274 | audmux_type = pdev->id_entry->driver_data; |
275 | if (audmux_type == IMX31_AUDMUX) | |
2405fc97 | 276 | audmux_debugfs_init(); |
7b4e08a7 | 277 | |
9eedbdf1 SH |
278 | return 0; |
279 | } | |
280 | ||
a0a3d518 | 281 | static int imx_audmux_remove(struct platform_device *pdev) |
3bc34a61 RZ |
282 | { |
283 | if (audmux_type == IMX31_AUDMUX) | |
284 | audmux_debugfs_remove(); | |
285 | clk_put(audmux_clk); | |
286 | ||
287 | return 0; | |
288 | } | |
289 | ||
290 | static struct platform_driver imx_audmux_driver = { | |
291 | .probe = imx_audmux_probe, | |
a0a3d518 | 292 | .remove = imx_audmux_remove, |
3bc34a61 RZ |
293 | .id_table = imx_audmux_ids, |
294 | .driver = { | |
295 | .name = DRIVER_NAME, | |
296 | .owner = THIS_MODULE, | |
9d5ef266 | 297 | .of_match_table = imx_audmux_dt_ids, |
3bc34a61 RZ |
298 | } |
299 | }; | |
300 | ||
301 | static int __init imx_audmux_init(void) | |
302 | { | |
303 | return platform_driver_register(&imx_audmux_driver); | |
304 | } | |
305 | subsys_initcall(imx_audmux_init); | |
306 | ||
307 | static void __exit imx_audmux_exit(void) | |
308 | { | |
309 | platform_driver_unregister(&imx_audmux_driver); | |
310 | } | |
311 | module_exit(imx_audmux_exit); | |
312 | ||
313 | MODULE_DESCRIPTION("Freescale i.MX AUDMUX driver"); | |
314 | MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>"); | |
315 | MODULE_LICENSE("GPL v2"); | |
316 | MODULE_ALIAS("platform:" DRIVER_NAME); |