sound/soc/imx/imx-audmux.c

   1 /*
   2  * Copyright 2012 Freescale Semiconductor, Inc.
   3  * Copyright 2012 Linaro Ltd.
   4  * 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.
  18  */
  19
  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
  30 #include "imx-audmux.h"
  31
  32 #define DRIVER_NAME "imx-audmux"
  33
  34 static struct clk *audmux_clk;
  35 static void __iomem *audmux_base;
  36
  37 #define IMX_AUDMUX_V2_PTCR(x)           ((x) * 8)
  38 #define IMX_AUDMUX_V2_PDCR(x)           ((x) * 8 + 4)
  39
  40 #ifdef CONFIG_DEBUG_FS
  41 static struct dentry *audmux_debugfs_root;
  42
  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)
  46 {
  47         switch (port) {
  48         case MX31_AUDMUX_PORT1_SSI0:
  49                 return "imx-ssi.0";
  50         case MX31_AUDMUX_PORT2_SSI1:
  51                 return "imx-ssi.1";
  52         case MX31_AUDMUX_PORT3_SSI_PINS_3:
  53                 return "SSI3";
  54         case MX31_AUDMUX_PORT4_SSI_PINS_4:
  55                 return "SSI4";
  56         case MX31_AUDMUX_PORT5_SSI_PINS_5:
  57                 return "SSI5";
  58         case MX31_AUDMUX_PORT6_SSI_PINS_6:
  59                 return "SSI6";
  60         default:
  61                 return "UNKNOWN";
  62         }
  63 }
  64
  65 static ssize_t audmux_read_file(struct file *file, char __user *user_buf,
  66                                 size_t count, loff_t *ppos)
  67 {
  68         ssize_t ret;
  69         char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
  70         int port = (int)file->private_data;
  71         u32 pdcr, ptcr;
  72
  73         if (!buf)
  74                 return -ENOMEM;
  75
  76         if (audmux_clk)
  77                 clk_prepare_enable(audmux_clk);
  78
  79         ptcr = readl(audmux_base + IMX_AUDMUX_V2_PTCR(port));
  80         pdcr = readl(audmux_base + IMX_AUDMUX_V2_PDCR(port));
  81
  82         if (audmux_clk)
  83                 clk_disable_unprepare(audmux_clk);
  84
  85         ret = snprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n",
  86                        pdcr, ptcr);
  87
  88         if (ptcr & IMX_AUDMUX_V2_PTCR_TFSDIR)
  89                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
  90                                 "TxFS output from %s, ",
  91                                 audmux_port_string((ptcr >> 27) & 0x7));
  92         else
  93                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
  94                                 "TxFS input, ");
  95
  96         if (ptcr & IMX_AUDMUX_V2_PTCR_TCLKDIR)
  97                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
  98                                 "TxClk output from %s",
  99                                 audmux_port_string((ptcr >> 22) & 0x7));
 100         else
 101                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
 102                                 "TxClk input");
 103
 104         ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n");
 105
 106         if (ptcr & IMX_AUDMUX_V2_PTCR_SYN) {
 107                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
 108                                 "Port is symmetric");
 109         } else {
 110                 if (ptcr & IMX_AUDMUX_V2_PTCR_RFSDIR)
 111                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
 112                                         "RxFS output from %s, ",
 113                                         audmux_port_string((ptcr >> 17) & 0x7));
 114                 else
 115                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
 116                                         "RxFS input, ");
 117
 118                 if (ptcr & IMX_AUDMUX_V2_PTCR_RCLKDIR)
 119                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
 120                                         "RxClk output from %s",
 121                                         audmux_port_string((ptcr >> 12) & 0x7));
 122                 else
 123                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
 124                                         "RxClk input");
 125         }
 126
 127         ret += snprintf(buf + ret, PAGE_SIZE - ret,
 128                         "\nData received from %s\n",
 129                         audmux_port_string((pdcr >> 13) & 0x7));
 130
 131         ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
 132
 133         kfree(buf);
 134
 135         return ret;
 136 }
 137
 138 static const struct file_operations audmux_debugfs_fops = {
 139         .open = simple_open,
 140         .read = audmux_read_file,
 141         .llseek = default_llseek,
 142 };
 143
 144 static void __init audmux_debugfs_init(void)
 145 {
 146         int i;
 147         char buf[20];
 148
 149         audmux_debugfs_root = debugfs_create_dir("audmux", NULL);
 150         if (!audmux_debugfs_root) {
 151                 pr_warning("Failed to create AUDMUX debugfs root\n");
 152                 return;
 153         }
 154
 155         for (i = 1; i < 8; i++) {
 156                 snprintf(buf, sizeof(buf), "ssi%d", i);
 157                 if (!debugfs_create_file(buf, 0444, audmux_debugfs_root,
 158                                          (void *)i, &audmux_debugfs_fops))
 159                         pr_warning("Failed to create AUDMUX port %d debugfs file\n",
 160                                    i);
 161         }
 162 }
 163
 164 static void __devexit audmux_debugfs_remove(void)
 165 {
 166         debugfs_remove_recursive(audmux_debugfs_root);
 167 }
 168 #else
 169 static inline void audmux_debugfs_init(void)
 170 {
 171 }
 172
 173 static inline void audmux_debugfs_remove(void)
 174 {
 175 }
 176 #endif
 177
 178 enum imx_audmux_type {
 179         IMX21_AUDMUX,
 180         IMX31_AUDMUX,
 181 } audmux_type;
 182
 183 static struct platform_device_id imx_audmux_ids[] = {
 184         {
 185                 .name = "imx21-audmux",
 186                 .driver_data = IMX21_AUDMUX,
 187         }, {
 188                 .name = "imx31-audmux",
 189                 .driver_data = IMX31_AUDMUX,
 190         }, {
 191                 /* sentinel */
 192         }
 193 };
 194 MODULE_DEVICE_TABLE(platform, imx_audmux_ids);
 195
 196 static const struct of_device_id imx_audmux_dt_ids[] = {
 197         { .compatible = "fsl,imx21-audmux", .data = &imx_audmux_ids[0], },
 198         { .compatible = "fsl,imx31-audmux", .data = &imx_audmux_ids[1], },
 199         { /* sentinel */ }
 200 };
 201 MODULE_DEVICE_TABLE(of, imx_audmux_dt_ids);
 202
 203 static const uint8_t port_mapping[] = {
 204         0x0, 0x4, 0x8, 0x10, 0x14, 0x1c,
 205 };
 206
 207 int imx_audmux_v1_configure_port(unsigned int port, unsigned int pcr)
 208 {
 209         if (audmux_type != IMX21_AUDMUX)
 210                 return -EINVAL;
 211
 212         if (!audmux_base)
 213                 return -ENOSYS;
 214
 215         if (port >= ARRAY_SIZE(port_mapping))
 216                 return -EINVAL;
 217
 218         writel(pcr, audmux_base + port_mapping[port]);
 219
 220         return 0;
 221 }
 222 EXPORT_SYMBOL_GPL(imx_audmux_v1_configure_port);
 223
 224 int imx_audmux_v2_configure_port(unsigned int port, unsigned int ptcr,
 225                 unsigned int pdcr)
 226 {
 227         if (audmux_type != IMX31_AUDMUX)
 228                 return -EINVAL;
 229
 230         if (!audmux_base)
 231                 return -ENOSYS;
 232
 233         if (audmux_clk)
 234                 clk_prepare_enable(audmux_clk);
 235
 236         writel(ptcr, audmux_base + IMX_AUDMUX_V2_PTCR(port));
 237         writel(pdcr, audmux_base + IMX_AUDMUX_V2_PDCR(port));
 238
 239         if (audmux_clk)
 240                 clk_disable_unprepare(audmux_clk);
 241
 242         return 0;
 243 }
 244 EXPORT_SYMBOL_GPL(imx_audmux_v2_configure_port);
 245
 246 static int __devinit imx_audmux_probe(struct platform_device *pdev)
 247 {
 248         struct resource *res;
 249         const struct of_device_id *of_id =
 250                         of_match_device(imx_audmux_dt_ids, &pdev->dev);
 251
 252         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 253         audmux_base = devm_request_and_ioremap(&pdev->dev, res);
 254         if (!audmux_base)
 255                 return -EADDRNOTAVAIL;
 256
 257         audmux_clk = clk_get(&pdev->dev, "audmux");
 258         if (IS_ERR(audmux_clk)) {
 259                 dev_dbg(&pdev->dev, "cannot get clock: %ld\n",
 260                                 PTR_ERR(audmux_clk));
 261                 audmux_clk = NULL;
 262         }
 263
 264         if (of_id)
 265                 pdev->id_entry = of_id->data;
 266         audmux_type = pdev->id_entry->driver_data;
 267         if (audmux_type == IMX31_AUDMUX)
 268                 audmux_debugfs_init();
 269
 270         return 0;
 271 }
 272
 273 static int __devexit imx_audmux_remove(struct platform_device *pdev)
 274 {
 275         if (audmux_type == IMX31_AUDMUX)
 276                 audmux_debugfs_remove();
 277         clk_put(audmux_clk);
 278
 279         return 0;
 280 }
 281
 282 static struct platform_driver imx_audmux_driver = {
 283         .probe          = imx_audmux_probe,
 284         .remove         = __devexit_p(imx_audmux_remove),
 285         .id_table       = imx_audmux_ids,
 286         .driver = {
 287                 .name   = DRIVER_NAME,
 288                 .owner  = THIS_MODULE,
 289                 .of_match_table = imx_audmux_dt_ids,
 290         }
 291 };
 292
 293 static int __init imx_audmux_init(void)
 294 {
 295         return platform_driver_register(&imx_audmux_driver);
 296 }
 297 subsys_initcall(imx_audmux_init);
 298
 299 static void __exit imx_audmux_exit(void)
 300 {
 301         platform_driver_unregister(&imx_audmux_driver);
 302 }
 303 module_exit(imx_audmux_exit);
 304
 305 MODULE_DESCRIPTION("Freescale i.MX AUDMUX driver");
 306 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
 307 MODULE_LICENSE("GPL v2");
 308 MODULE_ALIAS("platform:" DRIVER_NAME);