1// SPDX-License-Identifier: GPL-2.0+
2//
3// Copyright 2012 Freescale Semiconductor, Inc.
4// Copyright 2012 Linaro Ltd.
5// Copyright 2009 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de>
6//
7// Initial development of this code was funded by
8// Phytec Messtechnik GmbH, https://www.phytec.de
9
10#include <linux/clk.h>
11#include <linux/debugfs.h>
12#include <linux/err.h>
13#include <linux/io.h>
14#include <linux/module.h>
15#include <linux/of.h>
16#include <linux/platform_device.h>
17#include <linux/slab.h>
18
19#include "imx-audmux.h"
20
21#define DRIVER_NAME "imx-audmux"
22
23static struct clk *audmux_clk;
24static void __iomem *audmux_base;
25static u32 *regcache;
26static u32 reg_max;
27
28#define IMX_AUDMUX_V2_PTCR(x) ((x) * 8)
29#define IMX_AUDMUX_V2_PDCR(x) ((x) * 8 + 4)
30
31#ifdef CONFIG_DEBUG_FS
32static struct dentry *audmux_debugfs_root;
33
34/* There is an annoying discontinuity in the SSI numbering with regard
35 * to the Linux number of the devices */
36static const char *audmux_port_string(int port)
37{
38 switch (port) {
39 case MX31_AUDMUX_PORT1_SSI0:
40 return "imx-ssi.0";
41 case MX31_AUDMUX_PORT2_SSI1:
42 return "imx-ssi.1";
43 case MX31_AUDMUX_PORT3_SSI_PINS_3:
44 return "SSI3";
45 case MX31_AUDMUX_PORT4_SSI_PINS_4:
46 return "SSI4";
47 case MX31_AUDMUX_PORT5_SSI_PINS_5:
48 return "SSI5";
49 case MX31_AUDMUX_PORT6_SSI_PINS_6:
50 return "SSI6";
51 default:
52 return "UNKNOWN";
53 }
54}
55
56static ssize_t audmux_read_file(struct file *file, char __user *user_buf,
57 size_t count, loff_t *ppos)
58{
59 ssize_t ret;
60 char *buf;
61 uintptr_t port = (uintptr_t)file->private_data;
62 u32 pdcr, ptcr;
63
64 ret = clk_prepare_enable(clk: audmux_clk);
65 if (ret)
66 return ret;
67
68 ptcr = readl(addr: audmux_base + IMX_AUDMUX_V2_PTCR(port));
69 pdcr = readl(addr: audmux_base + IMX_AUDMUX_V2_PDCR(port));
70
71 clk_disable_unprepare(clk: audmux_clk);
72
73 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
74 if (!buf)
75 return -ENOMEM;
76
77 ret = sysfs_emit(buf, fmt: "PDCR: %08x\nPTCR: %08x\n", pdcr, ptcr);
78
79 if (ptcr & IMX_AUDMUX_V2_PTCR_TFSDIR)
80 ret += scnprintf(buf: buf + ret, PAGE_SIZE - ret,
81 fmt: "TxFS output from %s, ",
82 audmux_port_string(port: (ptcr >> 27) & 0x7));
83 else
84 ret += scnprintf(buf: buf + ret, PAGE_SIZE - ret,
85 fmt: "TxFS input, ");
86
87 if (ptcr & IMX_AUDMUX_V2_PTCR_TCLKDIR)
88 ret += scnprintf(buf: buf + ret, PAGE_SIZE - ret,
89 fmt: "TxClk output from %s",
90 audmux_port_string(port: (ptcr >> 22) & 0x7));
91 else
92 ret += scnprintf(buf: buf + ret, PAGE_SIZE - ret,
93 fmt: "TxClk input");
94
95 ret += scnprintf(buf: buf + ret, PAGE_SIZE - ret, fmt: "\n");
96
97 if (ptcr & IMX_AUDMUX_V2_PTCR_SYN) {
98 ret += scnprintf(buf: buf + ret, PAGE_SIZE - ret,
99 fmt: "Port is symmetric");
100 } else {
101 if (ptcr & IMX_AUDMUX_V2_PTCR_RFSDIR)
102 ret += scnprintf(buf: buf + ret, PAGE_SIZE - ret,
103 fmt: "RxFS output from %s, ",
104 audmux_port_string(port: (ptcr >> 17) & 0x7));
105 else
106 ret += scnprintf(buf: buf + ret, PAGE_SIZE - ret,
107 fmt: "RxFS input, ");
108
109 if (ptcr & IMX_AUDMUX_V2_PTCR_RCLKDIR)
110 ret += scnprintf(buf: buf + ret, PAGE_SIZE - ret,
111 fmt: "RxClk output from %s",
112 audmux_port_string(port: (ptcr >> 12) & 0x7));
113 else
114 ret += scnprintf(buf: buf + ret, PAGE_SIZE - ret,
115 fmt: "RxClk input");
116 }
117
118 ret += scnprintf(buf: buf + ret, PAGE_SIZE - ret,
119 fmt: "\nData received from %s\n",
120 audmux_port_string(port: (pdcr >> 13) & 0x7));
121
122 ret = simple_read_from_buffer(to: user_buf, count, ppos, from: buf, available: ret);
123
124 kfree(objp: buf);
125
126 return ret;
127}
128
129static const struct file_operations audmux_debugfs_fops = {
130 .open = simple_open,
131 .read = audmux_read_file,
132 .llseek = default_llseek,
133};
134
135static void audmux_debugfs_init(void)
136{
137 uintptr_t i;
138 char buf[20];
139
140 audmux_debugfs_root = debugfs_create_dir(name: "audmux", NULL);
141
142 for (i = 0; i < MX31_AUDMUX_PORT7_SSI_PINS_7 + 1; i++) {
143 snprintf(buf, size: sizeof(buf), fmt: "ssi%lu", i);
144 debugfs_create_file(buf, 0444, audmux_debugfs_root,
145 (void *)i, &audmux_debugfs_fops);
146 }
147}
148
149static void audmux_debugfs_remove(void)
150{
151 debugfs_remove_recursive(dentry: audmux_debugfs_root);
152}
153#else
154static inline void audmux_debugfs_init(void)
155{
156}
157
158static inline void audmux_debugfs_remove(void)
159{
160}
161#endif
162
163static enum imx_audmux_type {
164 IMX21_AUDMUX,
165 IMX31_AUDMUX,
166} audmux_type;
167
168static const struct of_device_id imx_audmux_dt_ids[] = {
169 { .compatible = "fsl,imx21-audmux", .data = (void *)IMX21_AUDMUX, },
170 { .compatible = "fsl,imx31-audmux", .data = (void *)IMX31_AUDMUX, },
171 { /* sentinel */ }
172};
173MODULE_DEVICE_TABLE(of, imx_audmux_dt_ids);
174
175static const uint8_t port_mapping[] = {
176 0x0, 0x4, 0x8, 0x10, 0x14, 0x1c,
177};
178
179int imx_audmux_v1_configure_port(unsigned int port, unsigned int pcr)
180{
181 if (audmux_type != IMX21_AUDMUX)
182 return -EINVAL;
183
184 if (!audmux_base)
185 return -ENOSYS;
186
187 if (port >= ARRAY_SIZE(port_mapping))
188 return -EINVAL;
189
190 writel(val: pcr, addr: audmux_base + port_mapping[port]);
191
192 return 0;
193}
194EXPORT_SYMBOL_GPL(imx_audmux_v1_configure_port);
195
196int imx_audmux_v2_configure_port(unsigned int port, unsigned int ptcr,
197 unsigned int pdcr)
198{
199 int ret;
200
201 if (audmux_type != IMX31_AUDMUX)
202 return -EINVAL;
203
204 if (!audmux_base)
205 return -ENOSYS;
206
207 ret = clk_prepare_enable(clk: audmux_clk);
208 if (ret)
209 return ret;
210
211 writel(val: ptcr, addr: audmux_base + IMX_AUDMUX_V2_PTCR(port));
212 writel(val: pdcr, addr: audmux_base + IMX_AUDMUX_V2_PDCR(port));
213
214 clk_disable_unprepare(clk: audmux_clk);
215
216 return 0;
217}
218EXPORT_SYMBOL_GPL(imx_audmux_v2_configure_port);
219
220static int imx_audmux_parse_dt_defaults(struct platform_device *pdev,
221 struct device_node *of_node)
222{
223 struct device_node *child;
224
225 for_each_available_child_of_node(of_node, child) {
226 unsigned int port;
227 unsigned int ptcr = 0;
228 unsigned int pdcr = 0;
229 unsigned int pcr = 0;
230 unsigned int val;
231 int ret;
232 int i = 0;
233
234 ret = of_property_read_u32(np: child, propname: "fsl,audmux-port", out_value: &port);
235 if (ret) {
236 dev_warn(&pdev->dev, "Failed to get fsl,audmux-port of child node \"%pOF\"\n",
237 child);
238 continue;
239 }
240 if (!of_property_present(np: child, propname: "fsl,port-config")) {
241 dev_warn(&pdev->dev, "child node \"%pOF\" does not have property fsl,port-config\n",
242 child);
243 continue;
244 }
245
246 for (i = 0; (ret = of_property_read_u32_index(np: child,
247 propname: "fsl,port-config", index: i, out_value: &val)) == 0;
248 ++i) {
249 if (audmux_type == IMX31_AUDMUX) {
250 if (i % 2)
251 pdcr |= val;
252 else
253 ptcr |= val;
254 } else {
255 pcr |= val;
256 }
257 }
258
259 if (ret != -EOVERFLOW) {
260 dev_err(&pdev->dev, "Failed to read u32 at index %d of child %pOF\n",
261 i, child);
262 continue;
263 }
264
265 if (audmux_type == IMX31_AUDMUX) {
266 if (i % 2) {
267 dev_err(&pdev->dev, "One pdcr value is missing in child node %pOF\n",
268 child);
269 continue;
270 }
271 imx_audmux_v2_configure_port(port, ptcr, pdcr);
272 } else {
273 imx_audmux_v1_configure_port(port, pcr);
274 }
275 }
276
277 return 0;
278}
279
280static int imx_audmux_probe(struct platform_device *pdev)
281{
282 audmux_base = devm_platform_ioremap_resource(pdev, index: 0);
283 if (IS_ERR(ptr: audmux_base))
284 return PTR_ERR(ptr: audmux_base);
285
286 audmux_clk = devm_clk_get(dev: &pdev->dev, id: "audmux");
287 if (IS_ERR(ptr: audmux_clk)) {
288 dev_dbg(&pdev->dev, "cannot get clock: %ld\n",
289 PTR_ERR(audmux_clk));
290 audmux_clk = NULL;
291 }
292
293 audmux_type = (uintptr_t)of_device_get_match_data(dev: &pdev->dev);
294
295 switch (audmux_type) {
296 case IMX31_AUDMUX:
297 audmux_debugfs_init();
298 reg_max = 14;
299 break;
300 case IMX21_AUDMUX:
301 reg_max = 6;
302 break;
303 default:
304 dev_err(&pdev->dev, "unsupported version!\n");
305 return -EINVAL;
306 }
307
308 regcache = devm_kcalloc(dev: &pdev->dev, n: reg_max, size: sizeof(u32), GFP_KERNEL);
309 if (!regcache)
310 return -ENOMEM;
311
312 imx_audmux_parse_dt_defaults(pdev, of_node: pdev->dev.of_node);
313
314 return 0;
315}
316
317static void imx_audmux_remove(struct platform_device *pdev)
318{
319 if (audmux_type == IMX31_AUDMUX)
320 audmux_debugfs_remove();
321}
322
323static int imx_audmux_suspend(struct device *dev)
324{
325 int i;
326
327 clk_prepare_enable(clk: audmux_clk);
328
329 for (i = 0; i < reg_max; i++)
330 regcache[i] = readl(addr: audmux_base + i * 4);
331
332 clk_disable_unprepare(clk: audmux_clk);
333
334 return 0;
335}
336
337static int imx_audmux_resume(struct device *dev)
338{
339 int i;
340
341 clk_prepare_enable(clk: audmux_clk);
342
343 for (i = 0; i < reg_max; i++)
344 writel(val: regcache[i], addr: audmux_base + i * 4);
345
346 clk_disable_unprepare(clk: audmux_clk);
347
348 return 0;
349}
350
351static const struct dev_pm_ops imx_audmux_pm = {
352 SYSTEM_SLEEP_PM_OPS(imx_audmux_suspend, imx_audmux_resume)
353};
354
355static struct platform_driver imx_audmux_driver = {
356 .probe = imx_audmux_probe,
357 .remove = imx_audmux_remove,
358 .driver = {
359 .name = DRIVER_NAME,
360 .pm = pm_sleep_ptr(&imx_audmux_pm),
361 .of_match_table = imx_audmux_dt_ids,
362 }
363};
364
365static int __init imx_audmux_init(void)
366{
367 return platform_driver_register(&imx_audmux_driver);
368}
369subsys_initcall(imx_audmux_init);
370
371static void __exit imx_audmux_exit(void)
372{
373 platform_driver_unregister(&imx_audmux_driver);
374}
375module_exit(imx_audmux_exit);
376
377MODULE_DESCRIPTION("Freescale i.MX AUDMUX driver");
378MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
379MODULE_LICENSE("GPL v2");
380MODULE_ALIAS("platform:" DRIVER_NAME);
381

source code of linux/sound/soc/fsl/imx-audmux.c