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Sascha Hauer9eedbdf2009-10-29 17:12:39 +01001/*
Richard Zhao3bc34a62012-03-05 22:30:52 +08002 * Copyright 2012 Freescale Semiconductor, Inc.
3 * Copyright 2012 Linaro Ltd.
Sascha Hauer9eedbdf2009-10-29 17:12:39 +01004 * 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.
Sascha Hauer9eedbdf2009-10-29 17:12:39 +010018 */
19
Sascha Hauer9eedbdf2009-10-29 17:12:39 +010020#include <linux/clk.h>
Mark Brown7b4e08a2010-01-11 16:33:18 +000021#include <linux/debugfs.h>
Richard Zhao3bc34a62012-03-05 22:30:52 +080022#include <linux/err.h>
23#include <linux/io.h>
24#include <linux/module.h>
Richard Zhao9d5ef262012-03-05 22:31:04 +080025#include <linux/of.h>
26#include <linux/of_device.h>
Richard Zhao3bc34a62012-03-05 22:30:52 +080027#include <linux/platform_device.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090028#include <linux/slab.h>
Richard Zhaoa1c85ec2012-06-04 09:42:54 +080029#include <linux/pinctrl/consumer.h>
Shawn Guo3c77c292012-03-05 22:30:53 +080030
31#include "imx-audmux.h"
Richard Zhao3bc34a62012-03-05 22:30:52 +080032
33#define DRIVER_NAME "imx-audmux"
Sascha Hauer9eedbdf2009-10-29 17:12:39 +010034
35static struct clk *audmux_clk;
36static void __iomem *audmux_base;
37
Shawn Guoaf4872f2012-03-05 22:30:54 +080038#define IMX_AUDMUX_V2_PTCR(x) ((x) * 8)
39#define IMX_AUDMUX_V2_PDCR(x) ((x) * 8 + 4)
Sascha Hauer9eedbdf2009-10-29 17:12:39 +010040
Mark Brown7b4e08a2010-01-11 16:33:18 +000041#ifdef CONFIG_DEBUG_FS
42static struct dentry *audmux_debugfs_root;
43
Mark Brown7b4e08a2010-01-11 16:33:18 +000044/* There is an annoying discontinuity in the SSI numbering with regard
45 * to the Linux number of the devices */
46static 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
66static 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)
Linus Torvalds34800592012-03-27 16:41:24 -070078 clk_prepare_enable(audmux_clk);
Mark Brown7b4e08a2010-01-11 16:33:18 +000079
Shawn Guoaf4872f2012-03-05 22:30:54 +080080 ptcr = readl(audmux_base + IMX_AUDMUX_V2_PTCR(port));
81 pdcr = readl(audmux_base + IMX_AUDMUX_V2_PDCR(port));
Mark Brown7b4e08a2010-01-11 16:33:18 +000082
83 if (audmux_clk)
Linus Torvalds34800592012-03-27 16:41:24 -070084 clk_disable_unprepare(audmux_clk);
Mark Brown7b4e08a2010-01-11 16:33:18 +000085
86 ret = snprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n",
87 pdcr, ptcr);
88
Shawn Guoaf4872f2012-03-05 22:30:54 +080089 if (ptcr & IMX_AUDMUX_V2_PTCR_TFSDIR)
Mark Brown7b4e08a2010-01-11 16:33:18 +000090 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
Shawn Guoaf4872f2012-03-05 22:30:54 +080097 if (ptcr & IMX_AUDMUX_V2_PTCR_TCLKDIR)
Mark Brown7b4e08a2010-01-11 16:33:18 +000098 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
Shawn Guoaf4872f2012-03-05 22:30:54 +0800107 if (ptcr & IMX_AUDMUX_V2_PTCR_SYN) {
Mark Brown7b4e08a2010-01-11 16:33:18 +0000108 ret += snprintf(buf + ret, PAGE_SIZE - ret,
109 "Port is symmetric");
110 } else {
Shawn Guoaf4872f2012-03-05 22:30:54 +0800111 if (ptcr & IMX_AUDMUX_V2_PTCR_RFSDIR)
Mark Brown7b4e08a2010-01-11 16:33:18 +0000112 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
Shawn Guoaf4872f2012-03-05 22:30:54 +0800119 if (ptcr & IMX_AUDMUX_V2_PTCR_RCLKDIR)
Mark Brown7b4e08a2010-01-11 16:33:18 +0000120 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
139static const struct file_operations audmux_debugfs_fops = {
Stephen Boyd234e3402012-04-05 14:25:11 -0700140 .open = simple_open,
Mark Brown7b4e08a2010-01-11 16:33:18 +0000141 .read = audmux_read_file,
Arnd Bergmann6038f372010-08-15 18:52:59 +0200142 .llseek = default_llseek,
Mark Brown7b4e08a2010-01-11 16:33:18 +0000143};
144
Richard Zhao3bc34a62012-03-05 22:30:52 +0800145static void __init audmux_debugfs_init(void)
Mark Brown7b4e08a2010-01-11 16:33:18 +0000146{
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
Torben Hohn409b78c2012-07-18 15:01:17 +0200156 for (i = 0; i < MX31_AUDMUX_PORT7_SSI_PINS_7 + 1; i++) {
Mark Brown7b4e08a2010-01-11 16:33:18 +0000157 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}
Richard Zhao3bc34a62012-03-05 22:30:52 +0800164
Bill Pembertona0a3d512012-12-07 09:26:16 -0500165static void audmux_debugfs_remove(void)
Richard Zhao3bc34a62012-03-05 22:30:52 +0800166{
167 debugfs_remove_recursive(audmux_debugfs_root);
168}
Mark Brown7b4e08a2010-01-11 16:33:18 +0000169#else
170static inline void audmux_debugfs_init(void)
171{
172}
Richard Zhao3bc34a62012-03-05 22:30:52 +0800173
174static inline void audmux_debugfs_remove(void)
175{
176}
Mark Brown7b4e08a2010-01-11 16:33:18 +0000177#endif
178
Richard Zhao3bc34a62012-03-05 22:30:52 +0800179enum imx_audmux_type {
180 IMX21_AUDMUX,
181 IMX31_AUDMUX,
182} audmux_type;
183
184static 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};
195MODULE_DEVICE_TABLE(platform, imx_audmux_ids);
196
Richard Zhao9d5ef262012-03-05 22:31:04 +0800197static 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};
202MODULE_DEVICE_TABLE(of, imx_audmux_dt_ids);
203
Shawn Guo2405fc92012-03-05 22:30:51 +0800204static const uint8_t port_mapping[] = {
205 0x0, 0x4, 0x8, 0x10, 0x14, 0x1c,
206};
207
Shawn Guoaf4872f2012-03-05 22:30:54 +0800208int imx_audmux_v1_configure_port(unsigned int port, unsigned int pcr)
Shawn Guo2405fc92012-03-05 22:30:51 +0800209{
Richard Zhao3bc34a62012-03-05 22:30:52 +0800210 if (audmux_type != IMX21_AUDMUX)
211 return -EINVAL;
212
Shawn Guo2405fc92012-03-05 22:30:51 +0800213 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}
Shawn Guoaf4872f2012-03-05 22:30:54 +0800223EXPORT_SYMBOL_GPL(imx_audmux_v1_configure_port);
Shawn Guo2405fc92012-03-05 22:30:51 +0800224
Shawn Guoaf4872f2012-03-05 22:30:54 +0800225int imx_audmux_v2_configure_port(unsigned int port, unsigned int ptcr,
Sascha Hauer9eedbdf2009-10-29 17:12:39 +0100226 unsigned int pdcr)
227{
Richard Zhao3bc34a62012-03-05 22:30:52 +0800228 if (audmux_type != IMX31_AUDMUX)
229 return -EINVAL;
230
Sascha Hauer9eedbdf2009-10-29 17:12:39 +0100231 if (!audmux_base)
232 return -ENOSYS;
233
234 if (audmux_clk)
Linus Torvalds34800592012-03-27 16:41:24 -0700235 clk_prepare_enable(audmux_clk);
Sascha Hauer9eedbdf2009-10-29 17:12:39 +0100236
Shawn Guoaf4872f2012-03-05 22:30:54 +0800237 writel(ptcr, audmux_base + IMX_AUDMUX_V2_PTCR(port));
238 writel(pdcr, audmux_base + IMX_AUDMUX_V2_PDCR(port));
Sascha Hauer9eedbdf2009-10-29 17:12:39 +0100239
240 if (audmux_clk)
Linus Torvalds34800592012-03-27 16:41:24 -0700241 clk_disable_unprepare(audmux_clk);
Sascha Hauer9eedbdf2009-10-29 17:12:39 +0100242
243 return 0;
244}
Shawn Guoaf4872f2012-03-05 22:30:54 +0800245EXPORT_SYMBOL_GPL(imx_audmux_v2_configure_port);
Sascha Hauer9eedbdf2009-10-29 17:12:39 +0100246
Bill Pembertona0a3d512012-12-07 09:26:16 -0500247static int imx_audmux_probe(struct platform_device *pdev)
Sascha Hauer9eedbdf2009-10-29 17:12:39 +0100248{
Richard Zhao3bc34a62012-03-05 22:30:52 +0800249 struct resource *res;
Richard Zhaoa1c85ec2012-06-04 09:42:54 +0800250 struct pinctrl *pinctrl;
Richard Zhao9d5ef262012-03-05 22:31:04 +0800251 const struct of_device_id *of_id =
252 of_match_device(imx_audmux_dt_ids, &pdev->dev);
Richard Zhao3bc34a62012-03-05 22:30:52 +0800253
254 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
255 audmux_base = devm_request_and_ioremap(&pdev->dev, res);
256 if (!audmux_base)
257 return -EADDRNOTAVAIL;
258
Richard Zhaoa1c85ec2012-06-04 09:42:54 +0800259 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
Richard Zhao3bc34a62012-03-05 22:30:52 +0800265 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;
Eric BĂ©nard8402ed32010-06-08 11:03:00 +0200270 }
Sascha Hauer56c6b872011-08-23 21:24:57 +0200271
Richard Zhao9d5ef262012-03-05 22:31:04 +0800272 if (of_id)
273 pdev->id_entry = of_id->data;
Richard Zhao3bc34a62012-03-05 22:30:52 +0800274 audmux_type = pdev->id_entry->driver_data;
275 if (audmux_type == IMX31_AUDMUX)
Shawn Guo2405fc92012-03-05 22:30:51 +0800276 audmux_debugfs_init();
Mark Brown7b4e08a2010-01-11 16:33:18 +0000277
Sascha Hauer9eedbdf2009-10-29 17:12:39 +0100278 return 0;
279}
280
Bill Pembertona0a3d512012-12-07 09:26:16 -0500281static int imx_audmux_remove(struct platform_device *pdev)
Richard Zhao3bc34a62012-03-05 22:30:52 +0800282{
283 if (audmux_type == IMX31_AUDMUX)
284 audmux_debugfs_remove();
285 clk_put(audmux_clk);
286
287 return 0;
288}
289
290static struct platform_driver imx_audmux_driver = {
291 .probe = imx_audmux_probe,
Bill Pembertona0a3d512012-12-07 09:26:16 -0500292 .remove = imx_audmux_remove,
Richard Zhao3bc34a62012-03-05 22:30:52 +0800293 .id_table = imx_audmux_ids,
294 .driver = {
295 .name = DRIVER_NAME,
296 .owner = THIS_MODULE,
Richard Zhao9d5ef262012-03-05 22:31:04 +0800297 .of_match_table = imx_audmux_dt_ids,
Richard Zhao3bc34a62012-03-05 22:30:52 +0800298 }
299};
300
301static int __init imx_audmux_init(void)
302{
303 return platform_driver_register(&imx_audmux_driver);
304}
305subsys_initcall(imx_audmux_init);
306
307static void __exit imx_audmux_exit(void)
308{
309 platform_driver_unregister(&imx_audmux_driver);
310}
311module_exit(imx_audmux_exit);
312
313MODULE_DESCRIPTION("Freescale i.MX AUDMUX driver");
314MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
315MODULE_LICENSE("GPL v2");
316MODULE_ALIAS("platform:" DRIVER_NAME);