2 * Copyright 2012 Freescale Semiconductor, Inc.
3 * Copyright 2012 Linaro Ltd.
4 * Copyright 2009 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de>
6 * Initial development of this code was funded by
7 * Phytec Messtechnik GmbH, http://www.phytec.de
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.
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.
20 #include <linux/clk.h>
21 #include <linux/debugfs.h>
22 #include <linux/err.h>
24 #include <linux/module.h>
26 #include <linux/of_device.h>
27 #include <linux/platform_device.h>
28 #include <linux/slab.h>
30 #include "imx-audmux.h"
32 #define DRIVER_NAME "imx-audmux"
34 static struct clk *audmux_clk;
35 static void __iomem *audmux_base;
37 #define IMX_AUDMUX_V2_PTCR(x) ((x) * 8)
38 #define IMX_AUDMUX_V2_PDCR(x) ((x) * 8 + 4)
40 #ifdef CONFIG_DEBUG_FS
41 static struct dentry *audmux_debugfs_root;
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)
48 case MX31_AUDMUX_PORT1_SSI0:
50 case MX31_AUDMUX_PORT2_SSI1:
52 case MX31_AUDMUX_PORT3_SSI_PINS_3:
54 case MX31_AUDMUX_PORT4_SSI_PINS_4:
56 case MX31_AUDMUX_PORT5_SSI_PINS_5:
58 case MX31_AUDMUX_PORT6_SSI_PINS_6:
65 static ssize_t audmux_read_file(struct file *file, char __user *user_buf,
66 size_t count, loff_t *ppos)
70 uintptr_t port = (uintptr_t)file->private_data;
74 ret = clk_prepare_enable(audmux_clk);
79 ptcr = readl(audmux_base + IMX_AUDMUX_V2_PTCR(port));
80 pdcr = readl(audmux_base + IMX_AUDMUX_V2_PDCR(port));
83 clk_disable_unprepare(audmux_clk);
85 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
89 ret = snprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n",
92 if (ptcr & IMX_AUDMUX_V2_PTCR_TFSDIR)
93 ret += snprintf(buf + ret, PAGE_SIZE - ret,
94 "TxFS output from %s, ",
95 audmux_port_string((ptcr >> 27) & 0x7));
97 ret += snprintf(buf + ret, PAGE_SIZE - ret,
100 if (ptcr & IMX_AUDMUX_V2_PTCR_TCLKDIR)
101 ret += snprintf(buf + ret, PAGE_SIZE - ret,
102 "TxClk output from %s",
103 audmux_port_string((ptcr >> 22) & 0x7));
105 ret += snprintf(buf + ret, PAGE_SIZE - ret,
108 ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n");
110 if (ptcr & IMX_AUDMUX_V2_PTCR_SYN) {
111 ret += snprintf(buf + ret, PAGE_SIZE - ret,
112 "Port is symmetric");
114 if (ptcr & IMX_AUDMUX_V2_PTCR_RFSDIR)
115 ret += snprintf(buf + ret, PAGE_SIZE - ret,
116 "RxFS output from %s, ",
117 audmux_port_string((ptcr >> 17) & 0x7));
119 ret += snprintf(buf + ret, PAGE_SIZE - ret,
122 if (ptcr & IMX_AUDMUX_V2_PTCR_RCLKDIR)
123 ret += snprintf(buf + ret, PAGE_SIZE - ret,
124 "RxClk output from %s",
125 audmux_port_string((ptcr >> 12) & 0x7));
127 ret += snprintf(buf + ret, PAGE_SIZE - ret,
131 ret += snprintf(buf + ret, PAGE_SIZE - ret,
132 "\nData received from %s\n",
133 audmux_port_string((pdcr >> 13) & 0x7));
135 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
142 static const struct file_operations audmux_debugfs_fops = {
144 .read = audmux_read_file,
145 .llseek = default_llseek,
148 static void audmux_debugfs_init(void)
153 audmux_debugfs_root = debugfs_create_dir("audmux", NULL);
154 if (!audmux_debugfs_root) {
155 pr_warning("Failed to create AUDMUX debugfs root\n");
159 for (i = 0; i < MX31_AUDMUX_PORT7_SSI_PINS_7 + 1; i++) {
160 snprintf(buf, sizeof(buf), "ssi%lu", 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 %lu debugfs file\n",
168 static void audmux_debugfs_remove(void)
170 debugfs_remove_recursive(audmux_debugfs_root);
173 static inline void audmux_debugfs_init(void)
177 static inline void audmux_debugfs_remove(void)
182 static enum imx_audmux_type {
187 static const struct platform_device_id imx_audmux_ids[] = {
189 .name = "imx21-audmux",
190 .driver_data = IMX21_AUDMUX,
192 .name = "imx31-audmux",
193 .driver_data = IMX31_AUDMUX,
198 MODULE_DEVICE_TABLE(platform, imx_audmux_ids);
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], },
205 MODULE_DEVICE_TABLE(of, imx_audmux_dt_ids);
207 static const uint8_t port_mapping[] = {
208 0x0, 0x4, 0x8, 0x10, 0x14, 0x1c,
211 int imx_audmux_v1_configure_port(unsigned int port, unsigned int pcr)
213 if (audmux_type != IMX21_AUDMUX)
219 if (port >= ARRAY_SIZE(port_mapping))
222 writel(pcr, audmux_base + port_mapping[port]);
226 EXPORT_SYMBOL_GPL(imx_audmux_v1_configure_port);
228 int imx_audmux_v2_configure_port(unsigned int port, unsigned int ptcr,
233 if (audmux_type != IMX31_AUDMUX)
240 ret = clk_prepare_enable(audmux_clk);
245 writel(ptcr, audmux_base + IMX_AUDMUX_V2_PTCR(port));
246 writel(pdcr, audmux_base + IMX_AUDMUX_V2_PDCR(port));
249 clk_disable_unprepare(audmux_clk);
253 EXPORT_SYMBOL_GPL(imx_audmux_v2_configure_port);
255 static int imx_audmux_parse_dt_defaults(struct platform_device *pdev,
256 struct device_node *of_node)
258 struct device_node *child;
260 for_each_available_child_of_node(of_node, child) {
262 unsigned int ptcr = 0;
263 unsigned int pdcr = 0;
264 unsigned int pcr = 0;
269 ret = of_property_read_u32(child, "fsl,audmux-port", &port);
271 dev_warn(&pdev->dev, "Failed to get fsl,audmux-port of child node \"%s\"\n",
275 if (!of_property_read_bool(child, "fsl,port-config")) {
276 dev_warn(&pdev->dev, "child node \"%s\" does not have property fsl,port-config\n",
281 for (i = 0; (ret = of_property_read_u32_index(child,
282 "fsl,port-config", i, &val)) == 0;
284 if (audmux_type == IMX31_AUDMUX) {
294 if (ret != -EOVERFLOW) {
295 dev_err(&pdev->dev, "Failed to read u32 at index %d of child %s\n",
296 i, child->full_name);
300 if (audmux_type == IMX31_AUDMUX) {
302 dev_err(&pdev->dev, "One pdcr value is missing in child node %s\n",
306 imx_audmux_v2_configure_port(port, ptcr, pdcr);
308 imx_audmux_v1_configure_port(port, pcr);
315 static int imx_audmux_probe(struct platform_device *pdev)
317 struct resource *res;
318 const struct of_device_id *of_id =
319 of_match_device(imx_audmux_dt_ids, &pdev->dev);
321 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
322 audmux_base = devm_ioremap_resource(&pdev->dev, res);
323 if (IS_ERR(audmux_base))
324 return PTR_ERR(audmux_base);
326 audmux_clk = devm_clk_get(&pdev->dev, "audmux");
327 if (IS_ERR(audmux_clk)) {
328 dev_dbg(&pdev->dev, "cannot get clock: %ld\n",
329 PTR_ERR(audmux_clk));
334 pdev->id_entry = of_id->data;
335 audmux_type = pdev->id_entry->driver_data;
336 if (audmux_type == IMX31_AUDMUX)
337 audmux_debugfs_init();
340 imx_audmux_parse_dt_defaults(pdev, pdev->dev.of_node);
345 static int imx_audmux_remove(struct platform_device *pdev)
347 if (audmux_type == IMX31_AUDMUX)
348 audmux_debugfs_remove();
353 static struct platform_driver imx_audmux_driver = {
354 .probe = imx_audmux_probe,
355 .remove = imx_audmux_remove,
356 .id_table = imx_audmux_ids,
359 .of_match_table = imx_audmux_dt_ids,
363 static int __init imx_audmux_init(void)
365 return platform_driver_register(&imx_audmux_driver);
367 subsys_initcall(imx_audmux_init);
369 static void __exit imx_audmux_exit(void)
371 platform_driver_unregister(&imx_audmux_driver);
373 module_exit(imx_audmux_exit);
375 MODULE_DESCRIPTION("Freescale i.MX AUDMUX driver");
376 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
377 MODULE_LICENSE("GPL v2");
378 MODULE_ALIAS("platform:" DRIVER_NAME);