sound/soc/fsl/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                 ret = clk_prepare_enable(audmux_clk);
  78                 if (ret)
  79                         return ret;
  80         }
  81
  82         ptcr = readl(audmux_base + IMX_AUDMUX_V2_PTCR(port));
  83         pdcr = readl(audmux_base + IMX_AUDMUX_V2_PDCR(port));
  84
  85         if (audmux_clk)
  86                 clk_disable_unprepare(audmux_clk);
  87
  88         ret = snprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n",
  89                        pdcr, ptcr);
  90
  91         if (ptcr & IMX_AUDMUX_V2_PTCR_TFSDIR)
  92                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
  93                                 "TxFS output from %s, ",
  94                                 audmux_port_string((ptcr >> 27) & 0x7));
  95         else
  96                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
  97                                 "TxFS input, ");
  98
  99         if (ptcr & IMX_AUDMUX_V2_PTCR_TCLKDIR)
 100                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
 101                                 "TxClk output from %s",
 102                                 audmux_port_string((ptcr >> 22) & 0x7));
 103         else
 104                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
 105                                 "TxClk input");
 106
 107         ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n");
 108
 109         if (ptcr & IMX_AUDMUX_V2_PTCR_SYN) {
 110                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
 111                                 "Port is symmetric");
 112         } else {
 113                 if (ptcr & IMX_AUDMUX_V2_PTCR_RFSDIR)
 114                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
 115                                         "RxFS output from %s, ",
 116                                         audmux_port_string((ptcr >> 17) & 0x7));
 117                 else
 118                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
 119                                         "RxFS input, ");
 120
 121                 if (ptcr & IMX_AUDMUX_V2_PTCR_RCLKDIR)
 122                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
 123                                         "RxClk output from %s",
 124                                         audmux_port_string((ptcr >> 12) & 0x7));
 125                 else
 126                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
 127                                         "RxClk input");
 128         }
 129
 130         ret += snprintf(buf + ret, PAGE_SIZE - ret,
 131                         "\nData received from %s\n",
 132                         audmux_port_string((pdcr >> 13) & 0x7));
 133
 134         ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
 135
 136         kfree(buf);
 137
 138         return ret;
 139 }
 140
 141 static const struct file_operations audmux_debugfs_fops = {
 142         .open = simple_open,
 143         .read = audmux_read_file,
 144         .llseek = default_llseek,
 145 };
 146
 147 static void __init audmux_debugfs_init(void)
 148 {
 149         int i;
 150         char buf[20];
 151
 152         audmux_debugfs_root = debugfs_create_dir("audmux", NULL);
 153         if (!audmux_debugfs_root) {
 154                 pr_warning("Failed to create AUDMUX debugfs root\n");
 155                 return;
 156         }
 157
 158         for (i = 0; i < MX31_AUDMUX_PORT7_SSI_PINS_7 + 1; i++) {
 159                 snprintf(buf, sizeof(buf), "ssi%d", i);
 160                 if (!debugfs_create_file(buf, 0444, audmux_debugfs_root,
 161                                          (void *)i, &audmux_debugfs_fops))
 162                         pr_warning("Failed to create AUDMUX port %d debugfs file\n",
 163                                    i);
 164         }
 165 }
 166
 167 static void audmux_debugfs_remove(void)
 168 {
 169         debugfs_remove_recursive(audmux_debugfs_root);
 170 }
 171 #else
 172 static inline void audmux_debugfs_init(void)
 173 {
 174 }
 175
 176 static inline void audmux_debugfs_remove(void)
 177 {
 178 }
 179 #endif
 180
 181 static enum imx_audmux_type {
 182         IMX21_AUDMUX,
 183         IMX31_AUDMUX,
 184 } audmux_type;
 185
 186 static struct platform_device_id imx_audmux_ids[] = {
 187         {
 188                 .name = "imx21-audmux",
 189                 .driver_data = IMX21_AUDMUX,
 190         }, {
 191                 .name = "imx31-audmux",
 192                 .driver_data = IMX31_AUDMUX,
 193         }, {
 194                 /* sentinel */
 195         }
 196 };
 197 MODULE_DEVICE_TABLE(platform, imx_audmux_ids);
 198
 199 static const struct of_device_id imx_audmux_dt_ids[] = {
 200         { .compatible = "fsl,imx21-audmux", .data = &imx_audmux_ids[0], },
 201         { .compatible = "fsl,imx31-audmux", .data = &imx_audmux_ids[1], },
 202         { /* sentinel */ }
 203 };
 204 MODULE_DEVICE_TABLE(of, imx_audmux_dt_ids);
 205
 206 static const uint8_t port_mapping[] = {
 207         0x0, 0x4, 0x8, 0x10, 0x14, 0x1c,
 208 };
 209
 210 int imx_audmux_v1_configure_port(unsigned int port, unsigned int pcr)
 211 {
 212         if (audmux_type != IMX21_AUDMUX)
 213                 return -EINVAL;
 214
 215         if (!audmux_base)
 216                 return -ENOSYS;
 217
 218         if (port >= ARRAY_SIZE(port_mapping))
 219                 return -EINVAL;
 220
 221         writel(pcr, audmux_base + port_mapping[port]);
 222
 223         return 0;
 224 }
 225 EXPORT_SYMBOL_GPL(imx_audmux_v1_configure_port);
 226
 227 int imx_audmux_v2_configure_port(unsigned int port, unsigned int ptcr,
 228                 unsigned int pdcr)
 229 {
 230         int ret;
 231
 232         if (audmux_type != IMX31_AUDMUX)
 233                 return -EINVAL;
 234
 235         if (!audmux_base)
 236                 return -ENOSYS;
 237
 238         if (audmux_clk) {
 239                 ret = clk_prepare_enable(audmux_clk);
 240                 if (ret)
 241                         return ret;
 242         }
 243
 244         writel(ptcr, audmux_base + IMX_AUDMUX_V2_PTCR(port));
 245         writel(pdcr, audmux_base + IMX_AUDMUX_V2_PDCR(port));
 246
 247         if (audmux_clk)
 248                 clk_disable_unprepare(audmux_clk);
 249
 250         return 0;
 251 }
 252 EXPORT_SYMBOL_GPL(imx_audmux_v2_configure_port);
 253
 254 static int imx_audmux_parse_dt_defaults(struct platform_device *pdev,
 255                 struct device_node *of_node)
 256 {
 257         struct device_node *child;
 258
 259         for_each_available_child_of_node(of_node, child) {
 260                 unsigned int port;
 261                 unsigned int ptcr = 0;
 262                 unsigned int pdcr = 0;
 263                 unsigned int pcr = 0;
 264                 unsigned int val;
 265                 int ret;
 266                 int i = 0;
 267
 268                 ret = of_property_read_u32(child, "fsl,audmux-port", &port);
 269                 if (ret) {
 270                         dev_warn(&pdev->dev, "Failed to get fsl,audmux-port of child node \"%s\"\n",
 271                                         child->full_name);
 272                         continue;
 273                 }
 274                 if (!of_property_read_bool(child, "fsl,port-config")) {
 275                         dev_warn(&pdev->dev, "child node \"%s\" does not have property fsl,port-config\n",
 276                                         child->full_name);
 277                         continue;
 278                 }
 279
 280                 for (i = 0; (ret = of_property_read_u32_index(child,
 281                                         "fsl,port-config", i, &val)) == 0;
 282                                 ++i) {
 283                         if (audmux_type == IMX31_AUDMUX) {
 284                                 if (i % 2)
 285                                         pdcr |= val;
 286                                 else
 287                                         ptcr |= val;
 288                         } else {
 289                                 pcr |= val;
 290                         }
 291                 }
 292
 293                 if (ret != -EOVERFLOW) {
 294                         dev_err(&pdev->dev, "Failed to read u32 at index %d of child %s\n",
 295                                         i, child->full_name);
 296                         continue;
 297                 }
 298
 299                 if (audmux_type == IMX31_AUDMUX) {
 300                         if (i % 2) {
 301                                 dev_err(&pdev->dev, "One pdcr value is missing in child node %s\n",
 302                                                 child->full_name);
 303                                 continue;
 304                         }
 305                         imx_audmux_v2_configure_port(port, ptcr, pdcr);
 306                 } else {
 307                         imx_audmux_v1_configure_port(port, pcr);
 308                 }
 309         }
 310
 311         return 0;
 312 }
 313
 314 static int imx_audmux_probe(struct platform_device *pdev)
 315 {
 316         struct resource *res;
 317         const struct of_device_id *of_id =
 318                         of_match_device(imx_audmux_dt_ids, &pdev->dev);
 319
 320         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 321         audmux_base = devm_ioremap_resource(&pdev->dev, res);
 322         if (IS_ERR(audmux_base))
 323                 return PTR_ERR(audmux_base);
 324
 325         audmux_clk = devm_clk_get(&pdev->dev, "audmux");
 326         if (IS_ERR(audmux_clk)) {
 327                 dev_dbg(&pdev->dev, "cannot get clock: %ld\n",
 328                                 PTR_ERR(audmux_clk));
 329                 audmux_clk = NULL;
 330         }
 331
 332         if (of_id)
 333                 pdev->id_entry = of_id->data;
 334         audmux_type = pdev->id_entry->driver_data;
 335         if (audmux_type == IMX31_AUDMUX)
 336                 audmux_debugfs_init();
 337
 338         if (of_id)
 339                 imx_audmux_parse_dt_defaults(pdev, pdev->dev.of_node);
 340
 341         return 0;
 342 }
 343
 344 static int imx_audmux_remove(struct platform_device *pdev)
 345 {
 346         if (audmux_type == IMX31_AUDMUX)
 347                 audmux_debugfs_remove();
 348
 349         return 0;
 350 }
 351
 352 static struct platform_driver imx_audmux_driver = {
 353         .probe          = imx_audmux_probe,
 354         .remove         = imx_audmux_remove,
 355         .id_table       = imx_audmux_ids,
 356         .driver = {
 357                 .name   = DRIVER_NAME,
 358                 .owner  = THIS_MODULE,
 359                 .of_match_table = imx_audmux_dt_ids,
 360         }
 361 };
 362
 363 static int __init imx_audmux_init(void)
 364 {
 365         return platform_driver_register(&imx_audmux_driver);
 366 }
 367 subsys_initcall(imx_audmux_init);
 368
 369 static void __exit imx_audmux_exit(void)
 370 {
 371         platform_driver_unregister(&imx_audmux_driver);
 372 }
 373 module_exit(imx_audmux_exit);
 374
 375 MODULE_DESCRIPTION("Freescale i.MX AUDMUX driver");
 376 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
 377 MODULE_LICENSE("GPL v2");
 378 MODULE_ALIAS("platform:" DRIVER_NAME);