1 // SPDX-License-Identifier: GPL-2.0+
3 // Copyright 2012 Freescale Semiconductor, Inc.
4 // Copyright 2012 Linaro Ltd.
5 // Copyright 2009 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de>
7 // Initial development of this code was funded by
8 // Phytec Messtechnik GmbH, http://www.phytec.de
10 #include <linux/clk.h>
11 #include <linux/debugfs.h>
12 #include <linux/err.h>
14 #include <linux/module.h>
16 #include <linux/of_device.h>
17 #include <linux/platform_device.h>
18 #include <linux/slab.h>
20 #include "imx-audmux.h"
22 #define DRIVER_NAME "imx-audmux"
24 static struct clk *audmux_clk;
25 static void __iomem *audmux_base;
27 #define IMX_AUDMUX_V2_PTCR(x) ((x) * 8)
28 #define IMX_AUDMUX_V2_PDCR(x) ((x) * 8 + 4)
30 #ifdef CONFIG_DEBUG_FS
31 static struct dentry *audmux_debugfs_root;
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)
38 case MX31_AUDMUX_PORT1_SSI0:
40 case MX31_AUDMUX_PORT2_SSI1:
42 case MX31_AUDMUX_PORT3_SSI_PINS_3:
44 case MX31_AUDMUX_PORT4_SSI_PINS_4:
46 case MX31_AUDMUX_PORT5_SSI_PINS_5:
48 case MX31_AUDMUX_PORT6_SSI_PINS_6:
55 static ssize_t audmux_read_file(struct file *file, char __user *user_buf,
56 size_t count, loff_t *ppos)
60 uintptr_t port = (uintptr_t)file->private_data;
64 ret = clk_prepare_enable(audmux_clk);
69 ptcr = readl(audmux_base + IMX_AUDMUX_V2_PTCR(port));
70 pdcr = readl(audmux_base + IMX_AUDMUX_V2_PDCR(port));
73 clk_disable_unprepare(audmux_clk);
75 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
79 ret = scnprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n",
82 if (ptcr & IMX_AUDMUX_V2_PTCR_TFSDIR)
83 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
84 "TxFS output from %s, ",
85 audmux_port_string((ptcr >> 27) & 0x7));
87 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
90 if (ptcr & IMX_AUDMUX_V2_PTCR_TCLKDIR)
91 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
92 "TxClk output from %s",
93 audmux_port_string((ptcr >> 22) & 0x7));
95 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
98 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n");
100 if (ptcr & IMX_AUDMUX_V2_PTCR_SYN) {
101 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
102 "Port is symmetric");
104 if (ptcr & IMX_AUDMUX_V2_PTCR_RFSDIR)
105 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
106 "RxFS output from %s, ",
107 audmux_port_string((ptcr >> 17) & 0x7));
109 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
112 if (ptcr & IMX_AUDMUX_V2_PTCR_RCLKDIR)
113 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
114 "RxClk output from %s",
115 audmux_port_string((ptcr >> 12) & 0x7));
117 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
121 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
122 "\nData received from %s\n",
123 audmux_port_string((pdcr >> 13) & 0x7));
125 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
132 static const struct file_operations audmux_debugfs_fops = {
134 .read = audmux_read_file,
135 .llseek = default_llseek,
138 static void audmux_debugfs_init(void)
143 audmux_debugfs_root = debugfs_create_dir("audmux", NULL);
145 for (i = 0; i < MX31_AUDMUX_PORT7_SSI_PINS_7 + 1; i++) {
146 snprintf(buf, sizeof(buf), "ssi%lu", i);
147 debugfs_create_file(buf, 0444, audmux_debugfs_root,
148 (void *)i, &audmux_debugfs_fops);
152 static void audmux_debugfs_remove(void)
154 debugfs_remove_recursive(audmux_debugfs_root);
157 static inline void audmux_debugfs_init(void)
161 static inline void audmux_debugfs_remove(void)
166 static enum imx_audmux_type {
171 static const struct platform_device_id imx_audmux_ids[] = {
173 .name = "imx21-audmux",
174 .driver_data = IMX21_AUDMUX,
176 .name = "imx31-audmux",
177 .driver_data = IMX31_AUDMUX,
182 MODULE_DEVICE_TABLE(platform, imx_audmux_ids);
184 static const struct of_device_id imx_audmux_dt_ids[] = {
185 { .compatible = "fsl,imx21-audmux", .data = &imx_audmux_ids[0], },
186 { .compatible = "fsl,imx31-audmux", .data = &imx_audmux_ids[1], },
189 MODULE_DEVICE_TABLE(of, imx_audmux_dt_ids);
191 static const uint8_t port_mapping[] = {
192 0x0, 0x4, 0x8, 0x10, 0x14, 0x1c,
195 int imx_audmux_v1_configure_port(unsigned int port, unsigned int pcr)
197 if (audmux_type != IMX21_AUDMUX)
203 if (port >= ARRAY_SIZE(port_mapping))
206 writel(pcr, audmux_base + port_mapping[port]);
210 EXPORT_SYMBOL_GPL(imx_audmux_v1_configure_port);
212 int imx_audmux_v2_configure_port(unsigned int port, unsigned int ptcr,
217 if (audmux_type != IMX31_AUDMUX)
224 ret = clk_prepare_enable(audmux_clk);
229 writel(ptcr, audmux_base + IMX_AUDMUX_V2_PTCR(port));
230 writel(pdcr, audmux_base + IMX_AUDMUX_V2_PDCR(port));
233 clk_disable_unprepare(audmux_clk);
237 EXPORT_SYMBOL_GPL(imx_audmux_v2_configure_port);
239 static int imx_audmux_parse_dt_defaults(struct platform_device *pdev,
240 struct device_node *of_node)
242 struct device_node *child;
244 for_each_available_child_of_node(of_node, child) {
246 unsigned int ptcr = 0;
247 unsigned int pdcr = 0;
248 unsigned int pcr = 0;
253 ret = of_property_read_u32(child, "fsl,audmux-port", &port);
255 dev_warn(&pdev->dev, "Failed to get fsl,audmux-port of child node \"%pOF\"\n",
259 if (!of_property_read_bool(child, "fsl,port-config")) {
260 dev_warn(&pdev->dev, "child node \"%pOF\" does not have property fsl,port-config\n",
265 for (i = 0; (ret = of_property_read_u32_index(child,
266 "fsl,port-config", i, &val)) == 0;
268 if (audmux_type == IMX31_AUDMUX) {
278 if (ret != -EOVERFLOW) {
279 dev_err(&pdev->dev, "Failed to read u32 at index %d of child %pOF\n",
284 if (audmux_type == IMX31_AUDMUX) {
286 dev_err(&pdev->dev, "One pdcr value is missing in child node %pOF\n",
290 imx_audmux_v2_configure_port(port, ptcr, pdcr);
292 imx_audmux_v1_configure_port(port, pcr);
299 static int imx_audmux_probe(struct platform_device *pdev)
301 struct resource *res;
302 const struct of_device_id *of_id =
303 of_match_device(imx_audmux_dt_ids, &pdev->dev);
305 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
306 audmux_base = devm_ioremap_resource(&pdev->dev, res);
307 if (IS_ERR(audmux_base))
308 return PTR_ERR(audmux_base);
310 audmux_clk = devm_clk_get(&pdev->dev, "audmux");
311 if (IS_ERR(audmux_clk)) {
312 dev_dbg(&pdev->dev, "cannot get clock: %ld\n",
313 PTR_ERR(audmux_clk));
318 pdev->id_entry = of_id->data;
319 audmux_type = pdev->id_entry->driver_data;
320 if (audmux_type == IMX31_AUDMUX)
321 audmux_debugfs_init();
324 imx_audmux_parse_dt_defaults(pdev, pdev->dev.of_node);
329 static int imx_audmux_remove(struct platform_device *pdev)
331 if (audmux_type == IMX31_AUDMUX)
332 audmux_debugfs_remove();
337 static struct platform_driver imx_audmux_driver = {
338 .probe = imx_audmux_probe,
339 .remove = imx_audmux_remove,
340 .id_table = imx_audmux_ids,
343 .of_match_table = imx_audmux_dt_ids,
347 static int __init imx_audmux_init(void)
349 return platform_driver_register(&imx_audmux_driver);
351 subsys_initcall(imx_audmux_init);
353 static void __exit imx_audmux_exit(void)
355 platform_driver_unregister(&imx_audmux_driver);
357 module_exit(imx_audmux_exit);
359 MODULE_DESCRIPTION("Freescale i.MX AUDMUX driver");
360 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
361 MODULE_LICENSE("GPL v2");
362 MODULE_ALIAS("platform:" DRIVER_NAME);