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20#include <linux/clk.h>
21#include <linux/debugfs.h>
22#include <linux/err.h>
23#include <linux/io.h>
24#include <linux/module.h>
25#include <linux/of.h>
26#include <linux/of_device.h>
27#include <linux/platform_device.h>
28#include <linux/slab.h>
29#include <linux/pinctrl/consumer.h>
30
31#include "imx-audmux.h"
32
33#define DRIVER_NAME "imx-audmux"
34
35static struct clk *audmux_clk;
36static void __iomem *audmux_base;
37
38#define IMX_AUDMUX_V2_PTCR(x) ((x) * 8)
39#define IMX_AUDMUX_V2_PDCR(x) ((x) * 8 + 4)
40
41#ifdef CONFIG_DEBUG_FS
42static struct dentry *audmux_debugfs_root;
43
44
45
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)
78 clk_prepare_enable(audmux_clk);
79
80 ptcr = readl(audmux_base + IMX_AUDMUX_V2_PTCR(port));
81 pdcr = readl(audmux_base + IMX_AUDMUX_V2_PDCR(port));
82
83 if (audmux_clk)
84 clk_disable_unprepare(audmux_clk);
85
86 ret = snprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n",
87 pdcr, ptcr);
88
89 if (ptcr & IMX_AUDMUX_V2_PTCR_TFSDIR)
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
97 if (ptcr & IMX_AUDMUX_V2_PTCR_TCLKDIR)
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
107 if (ptcr & IMX_AUDMUX_V2_PTCR_SYN) {
108 ret += snprintf(buf + ret, PAGE_SIZE - ret,
109 "Port is symmetric");
110 } else {
111 if (ptcr & IMX_AUDMUX_V2_PTCR_RFSDIR)
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
119 if (ptcr & IMX_AUDMUX_V2_PTCR_RCLKDIR)
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
139static const struct file_operations audmux_debugfs_fops = {
140 .open = simple_open,
141 .read = audmux_read_file,
142 .llseek = default_llseek,
143};
144
145static void __init audmux_debugfs_init(void)
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
156 for (i = 0; i < MX31_AUDMUX_PORT7_SSI_PINS_7 + 1; i++) {
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}
164
165static void audmux_debugfs_remove(void)
166{
167 debugfs_remove_recursive(audmux_debugfs_root);
168}
169#else
170static inline void audmux_debugfs_init(void)
171{
172}
173
174static inline void audmux_debugfs_remove(void)
175{
176}
177#endif
178
179static enum 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
193 }
194};
195MODULE_DEVICE_TABLE(platform, imx_audmux_ids);
196
197static 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 { }
201};
202MODULE_DEVICE_TABLE(of, imx_audmux_dt_ids);
203
204static const uint8_t port_mapping[] = {
205 0x0, 0x4, 0x8, 0x10, 0x14, 0x1c,
206};
207
208int imx_audmux_v1_configure_port(unsigned int port, unsigned int pcr)
209{
210 if (audmux_type != IMX21_AUDMUX)
211 return -EINVAL;
212
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}
223EXPORT_SYMBOL_GPL(imx_audmux_v1_configure_port);
224
225int imx_audmux_v2_configure_port(unsigned int port, unsigned int ptcr,
226 unsigned int pdcr)
227{
228 if (audmux_type != IMX31_AUDMUX)
229 return -EINVAL;
230
231 if (!audmux_base)
232 return -ENOSYS;
233
234 if (audmux_clk)
235 clk_prepare_enable(audmux_clk);
236
237 writel(ptcr, audmux_base + IMX_AUDMUX_V2_PTCR(port));
238 writel(pdcr, audmux_base + IMX_AUDMUX_V2_PDCR(port));
239
240 if (audmux_clk)
241 clk_disable_unprepare(audmux_clk);
242
243 return 0;
244}
245EXPORT_SYMBOL_GPL(imx_audmux_v2_configure_port);
246
247static int imx_audmux_probe(struct platform_device *pdev)
248{
249 struct resource *res;
250 struct pinctrl *pinctrl;
251 const struct of_device_id *of_id =
252 of_match_device(imx_audmux_dt_ids, &pdev->dev);
253
254 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
255 audmux_base = devm_ioremap_resource(&pdev->dev, res);
256 if (IS_ERR(audmux_base))
257 return PTR_ERR(audmux_base);
258
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
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;
270 }
271
272 if (of_id)
273 pdev->id_entry = of_id->data;
274 audmux_type = pdev->id_entry->driver_data;
275 if (audmux_type == IMX31_AUDMUX)
276 audmux_debugfs_init();
277
278 return 0;
279}
280
281static int imx_audmux_remove(struct platform_device *pdev)
282{
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,
292 .remove = imx_audmux_remove,
293 .id_table = imx_audmux_ids,
294 .driver = {
295 .name = DRIVER_NAME,
296 .owner = THIS_MODULE,
297 .of_match_table = imx_audmux_dt_ids,
298 }
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);
317
