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 static int audmux_open_file(struct inode *inode, struct file *file)
  44 {
  45         file->private_data = inode->i_private;
  46         return 0;
  47 }
  48
  49 /* There is an annoying discontinuity in the SSI numbering with regard
  50  * to the Linux number of the devices */
  51 static const char *audmux_port_string(int port)
  52 {
  53         switch (port) {
  54         case MX31_AUDMUX_PORT1_SSI0:
  55                 return "imx-ssi.0";
  56         case MX31_AUDMUX_PORT2_SSI1:
  57                 return "imx-ssi.1";
  58         case MX31_AUDMUX_PORT3_SSI_PINS_3:
  59                 return "SSI3";
  60         case MX31_AUDMUX_PORT4_SSI_PINS_4:
  61                 return "SSI4";
  62         case MX31_AUDMUX_PORT5_SSI_PINS_5:
  63                 return "SSI5";
  64         case MX31_AUDMUX_PORT6_SSI_PINS_6:
  65                 return "SSI6";
  66         default:
  67                 return "UNKNOWN";
  68         }
  69 }
  70
  71 static ssize_t audmux_read_file(struct file *file, char __user *user_buf,
  72                                 size_t count, loff_t *ppos)
  73 {
  74         ssize_t ret;
  75         char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
  76         int port = (int)file->private_data;
  77         u32 pdcr, ptcr;
  78
  79         if (!buf)
  80                 return -ENOMEM;
  81
  82         if (audmux_clk)
  83                 clk_prepare_enable(audmux_clk);
  84
  85         ptcr = readl(audmux_base + IMX_AUDMUX_V2_PTCR(port));
  86         pdcr = readl(audmux_base + IMX_AUDMUX_V2_PDCR(port));
  87
  88         if (audmux_clk)
  89                 clk_disable_unprepare(audmux_clk);
  90
  91         ret = snprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n",
  92                        pdcr, ptcr);
  93
  94         if (ptcr & IMX_AUDMUX_V2_PTCR_TFSDIR)
  95                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
  96                                 "TxFS output from %s, ",
  97                                 audmux_port_string((ptcr >> 27) & 0x7));
  98         else
  99                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
 100                                 "TxFS input, ");
 101
 102         if (ptcr & IMX_AUDMUX_V2_PTCR_TCLKDIR)
 103                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
 104                                 "TxClk output from %s",
 105                                 audmux_port_string((ptcr >> 22) & 0x7));
 106         else
 107                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
 108                                 "TxClk input");
 109
 110         ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n");
 111
 112         if (ptcr & IMX_AUDMUX_V2_PTCR_SYN) {
 113                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
 114                                 "Port is symmetric");
 115         } else {
 116                 if (ptcr & IMX_AUDMUX_V2_PTCR_RFSDIR)
 117                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
 118                                         "RxFS output from %s, ",
 119                                         audmux_port_string((ptcr >> 17) & 0x7));
 120                 else
 121                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
 122                                         "RxFS input, ");
 123
 124                 if (ptcr & IMX_AUDMUX_V2_PTCR_RCLKDIR)
 125                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
 126                                         "RxClk output from %s",
 127                                         audmux_port_string((ptcr >> 12) & 0x7));
 128                 else
 129                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
 130                                         "RxClk input");
 131         }
 132
 133         ret += snprintf(buf + ret, PAGE_SIZE - ret,
 134                         "\nData received from %s\n",
 135                         audmux_port_string((pdcr >> 13) & 0x7));
 136
 137         ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
 138
 139         kfree(buf);
 140
 141         return ret;
 142 }
 143
 144 static const struct file_operations audmux_debugfs_fops = {
 145         .open = audmux_open_file,
 146         .read = audmux_read_file,
 147         .llseek = default_llseek,
 148 };
 149
 150 static void __init audmux_debugfs_init(void)
 151 {
 152         int i;
 153         char buf[20];
 154
 155         audmux_debugfs_root = debugfs_create_dir("audmux", NULL);
 156         if (!audmux_debugfs_root) {
 157                 pr_warning("Failed to create AUDMUX debugfs root\n");
 158                 return;
 159         }
 160
 161         for (i = 1; i < 8; i++) {
 162                 snprintf(buf, sizeof(buf), "ssi%d", i);
 163                 if (!debugfs_create_file(buf, 0444, audmux_debugfs_root,
 164                                          (void *)i, &audmux_debugfs_fops))
 165                         pr_warning("Failed to create AUDMUX port %d debugfs file\n",
 166                                    i);
 167         }
 168 }
 169
 170 static void __devexit audmux_debugfs_remove(void)
 171 {
 172         debugfs_remove_recursive(audmux_debugfs_root);
 173 }
 174 #else
 175 static inline void audmux_debugfs_init(void)
 176 {
 177 }
 178
 179 static inline void audmux_debugfs_remove(void)
 180 {
 181 }
 182 #endif
 183
 184 enum imx_audmux_type {
 185         IMX21_AUDMUX,
 186         IMX31_AUDMUX,
 187 } audmux_type;
 188
 189 static struct platform_device_id imx_audmux_ids[] = {
 190         {
 191                 .name = "imx21-audmux",
 192                 .driver_data = IMX21_AUDMUX,
 193         }, {
 194                 .name = "imx31-audmux",
 195                 .driver_data = IMX31_AUDMUX,
 196         }, {
 197                 /* sentinel */
 198         }
 199 };
 200 MODULE_DEVICE_TABLE(platform, imx_audmux_ids);
 201
 202 static const struct of_device_id imx_audmux_dt_ids[] = {
 203         { .compatible = "fsl,imx21-audmux", .data = &imx_audmux_ids[0], },
 204         { .compatible = "fsl,imx31-audmux", .data = &imx_audmux_ids[1], },
 205         { /* sentinel */ }
 206 };
 207 MODULE_DEVICE_TABLE(of, imx_audmux_dt_ids);
 208
 209 static const uint8_t port_mapping[] = {
 210         0x0, 0x4, 0x8, 0x10, 0x14, 0x1c,
 211 };
 212
 213 int imx_audmux_v1_configure_port(unsigned int port, unsigned int pcr)
 214 {
 215         if (audmux_type != IMX21_AUDMUX)
 216                 return -EINVAL;
 217
 218         if (!audmux_base)
 219                 return -ENOSYS;
 220
 221         if (port >= ARRAY_SIZE(port_mapping))
 222                 return -EINVAL;
 223
 224         writel(pcr, audmux_base + port_mapping[port]);
 225
 226         return 0;
 227 }
 228 EXPORT_SYMBOL_GPL(imx_audmux_v1_configure_port);
 229
 230 int imx_audmux_v2_configure_port(unsigned int port, unsigned int ptcr,
 231                 unsigned int pdcr)
 232 {
 233         if (audmux_type != IMX31_AUDMUX)
 234                 return -EINVAL;
 235
 236         if (!audmux_base)
 237                 return -ENOSYS;
 238
 239         if (audmux_clk)
 240                 clk_prepare_enable(audmux_clk);
 241
 242         writel(ptcr, audmux_base + IMX_AUDMUX_V2_PTCR(port));
 243         writel(pdcr, audmux_base + IMX_AUDMUX_V2_PDCR(port));
 244
 245         if (audmux_clk)
 246                 clk_disable_unprepare(audmux_clk);
 247
 248         return 0;
 249 }
 250 EXPORT_SYMBOL_GPL(imx_audmux_v2_configure_port);
 251
 252 static int __devinit imx_audmux_probe(struct platform_device *pdev)
 253 {
 254         struct resource *res;
 255         const struct of_device_id *of_id =
 256                         of_match_device(imx_audmux_dt_ids, &pdev->dev);
 257
 258         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 259         audmux_base = devm_request_and_ioremap(&pdev->dev, res);
 260         if (!audmux_base)
 261                 return -EADDRNOTAVAIL;
 262
 263         audmux_clk = clk_get(&pdev->dev, "audmux");
 264         if (IS_ERR(audmux_clk)) {
 265                 dev_dbg(&pdev->dev, "cannot get clock: %ld\n",
 266                                 PTR_ERR(audmux_clk));
 267                 audmux_clk = NULL;
 268         }
 269
 270         if (of_id)
 271                 pdev->id_entry = of_id->data;
 272         audmux_type = pdev->id_entry->driver_data;
 273         if (audmux_type == IMX31_AUDMUX)
 274                 audmux_debugfs_init();
 275
 276         return 0;
 277 }
 278
 279 static int __devexit imx_audmux_remove(struct platform_device *pdev)
 280 {
 281         if (audmux_type == IMX31_AUDMUX)
 282                 audmux_debugfs_remove();
 283         clk_put(audmux_clk);
 284
 285         return 0;
 286 }
 287
 288 static struct platform_driver imx_audmux_driver = {
 289         .probe          = imx_audmux_probe,
 290         .remove         = __devexit_p(imx_audmux_remove),
 291         .id_table       = imx_audmux_ids,
 292         .driver = {
 293                 .name   = DRIVER_NAME,
 294                 .owner  = THIS_MODULE,
 295                 .of_match_table = imx_audmux_dt_ids,
 296         }
 297 };
 298
 299 static int __init imx_audmux_init(void)
 300 {
 301         return platform_driver_register(&imx_audmux_driver);
 302 }
 303 subsys_initcall(imx_audmux_init);
 304
 305 static void __exit imx_audmux_exit(void)
 306 {
 307         platform_driver_unregister(&imx_audmux_driver);
 308 }
 309 module_exit(imx_audmux_exit);
 310
 311 MODULE_DESCRIPTION("Freescale i.MX AUDMUX driver");
 312 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
 313 MODULE_LICENSE("GPL v2");
 314 MODULE_ALIAS("platform:" DRIVER_NAME);