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;
  70         uintptr_t port = (uintptr_t)file->private_data;
  71         u32 pdcr, ptcr;
  72
  73         if (audmux_clk) {
  74                 ret = clk_prepare_enable(audmux_clk);
  75                 if (ret)
  76                         return ret;
  77         }
  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         buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
  86         if (!buf)
  87                 return -ENOMEM;
  88
  89         ret = snprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n",
  90                        pdcr, ptcr);
  91
  92         if (ptcr & IMX_AUDMUX_V2_PTCR_TFSDIR)
  93                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
  94                                 "TxFS output from %s, ",
  95                                 audmux_port_string((ptcr >> 27) & 0x7));
  96         else
  97                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
  98                                 "TxFS input, ");
  99
 100         if (ptcr & IMX_AUDMUX_V2_PTCR_TCLKDIR)
 101                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
 102                                 "TxClk output from %s",
 103                                 audmux_port_string((ptcr >> 22) & 0x7));
 104         else
 105                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
 106                                 "TxClk input");
 107
 108         ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n");
 109
 110         if (ptcr & IMX_AUDMUX_V2_PTCR_SYN) {
 111                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
 112                                 "Port is symmetric");
 113         } else {
 114                 if (ptcr & IMX_AUDMUX_V2_PTCR_RFSDIR)
 115                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
 116                                         "RxFS output from %s, ",
 117                                         audmux_port_string((ptcr >> 17) & 0x7));
 118                 else
 119                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
 120                                         "RxFS input, ");
 121
 122                 if (ptcr & IMX_AUDMUX_V2_PTCR_RCLKDIR)
 123                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
 124                                         "RxClk output from %s",
 125                                         audmux_port_string((ptcr >> 12) & 0x7));
 126                 else
 127                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
 128                                         "RxClk input");
 129         }
 130
 131         ret += snprintf(buf + ret, PAGE_SIZE - ret,
 132                         "\nData received from %s\n",
 133                         audmux_port_string((pdcr >> 13) & 0x7));
 134
 135         ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
 136
 137         kfree(buf);
 138
 139         return ret;
 140 }
 141
 142 static const struct file_operations audmux_debugfs_fops = {
 143         .open = simple_open,
 144         .read = audmux_read_file,
 145         .llseek = default_llseek,
 146 };
 147
 148 static void audmux_debugfs_init(void)
 149 {
 150         uintptr_t i;
 151         char buf[20];
 152
 153         audmux_debugfs_root = debugfs_create_dir("audmux", NULL);
 154         if (!audmux_debugfs_root) {
 155                 pr_warning("Failed to create AUDMUX debugfs root\n");
 156                 return;
 157         }
 158
 159         for (i = 0; i < MX31_AUDMUX_PORT7_SSI_PINS_7 + 1; i++) {
 160                 snprintf(buf, sizeof(buf), "ssi%lu", i);
 161                 if (!debugfs_create_file(buf, 0444, audmux_debugfs_root,
 162                                          (void *)i, &audmux_debugfs_fops))
 163                         pr_warning("Failed to create AUDMUX port %lu debugfs file\n",
 164                                    i);
 165         }
 166 }
 167
 168 static void audmux_debugfs_remove(void)
 169 {
 170         debugfs_remove_recursive(audmux_debugfs_root);
 171 }
 172 #else
 173 static inline void audmux_debugfs_init(void)
 174 {
 175 }
 176
 177 static inline void audmux_debugfs_remove(void)
 178 {
 179 }
 180 #endif
 181
 182 static enum imx_audmux_type {
 183         IMX21_AUDMUX,
 184         IMX31_AUDMUX,
 185 } audmux_type;
 186
 187 static struct platform_device_id imx_audmux_ids[] = {
 188         {
 189                 .name = "imx21-audmux",
 190                 .driver_data = IMX21_AUDMUX,
 191         }, {
 192                 .name = "imx31-audmux",
 193                 .driver_data = IMX31_AUDMUX,
 194         }, {
 195                 /* sentinel */
 196         }
 197 };
 198 MODULE_DEVICE_TABLE(platform, imx_audmux_ids);
 199
 200 static const struct of_device_id imx_audmux_dt_ids[] = {
 201         { .compatible = "fsl,imx21-audmux", .data = &imx_audmux_ids[0], },
 202         { .compatible = "fsl,imx31-audmux", .data = &imx_audmux_ids[1], },
 203         { /* sentinel */ }
 204 };
 205 MODULE_DEVICE_TABLE(of, imx_audmux_dt_ids);
 206
 207 static const uint8_t port_mapping[] = {
 208         0x0, 0x4, 0x8, 0x10, 0x14, 0x1c,
 209 };
 210
 211 int imx_audmux_v1_configure_port(unsigned int port, unsigned int pcr)
 212 {
 213         if (audmux_type != IMX21_AUDMUX)
 214                 return -EINVAL;
 215
 216         if (!audmux_base)
 217                 return -ENOSYS;
 218
 219         if (port >= ARRAY_SIZE(port_mapping))
 220                 return -EINVAL;
 221
 222         writel(pcr, audmux_base + port_mapping[port]);
 223
 224         return 0;
 225 }
 226 EXPORT_SYMBOL_GPL(imx_audmux_v1_configure_port);
 227
 228 int imx_audmux_v2_configure_port(unsigned int port, unsigned int ptcr,
 229                 unsigned int pdcr)
 230 {
 231         int ret;
 232
 233         if (audmux_type != IMX31_AUDMUX)
 234                 return -EINVAL;
 235
 236         if (!audmux_base)
 237                 return -ENOSYS;
 238
 239         if (audmux_clk) {
 240                 ret = clk_prepare_enable(audmux_clk);
 241                 if (ret)
 242                         return ret;
 243         }
 244
 245         writel(ptcr, audmux_base + IMX_AUDMUX_V2_PTCR(port));
 246         writel(pdcr, audmux_base + IMX_AUDMUX_V2_PDCR(port));
 247
 248         if (audmux_clk)
 249                 clk_disable_unprepare(audmux_clk);
 250
 251         return 0;
 252 }
 253 EXPORT_SYMBOL_GPL(imx_audmux_v2_configure_port);
 254
 255 static int imx_audmux_parse_dt_defaults(struct platform_device *pdev,
 256                 struct device_node *of_node)
 257 {
 258         struct device_node *child;
 259
 260         for_each_available_child_of_node(of_node, child) {
 261                 unsigned int port;
 262                 unsigned int ptcr = 0;
 263                 unsigned int pdcr = 0;
 264                 unsigned int pcr = 0;
 265                 unsigned int val;
 266                 int ret;
 267                 int i = 0;
 268
 269                 ret = of_property_read_u32(child, "fsl,audmux-port", &port);
 270                 if (ret) {
 271                         dev_warn(&pdev->dev, "Failed to get fsl,audmux-port of child node \"%s\"\n",
 272                                         child->full_name);
 273                         continue;
 274                 }
 275                 if (!of_property_read_bool(child, "fsl,port-config")) {
 276                         dev_warn(&pdev->dev, "child node \"%s\" does not have property fsl,port-config\n",
 277                                         child->full_name);
 278                         continue;
 279                 }
 280
 281                 for (i = 0; (ret = of_property_read_u32_index(child,
 282                                         "fsl,port-config", i, &val)) == 0;
 283                                 ++i) {
 284                         if (audmux_type == IMX31_AUDMUX) {
 285                                 if (i % 2)
 286                                         pdcr |= val;
 287                                 else
 288                                         ptcr |= val;
 289                         } else {
 290                                 pcr |= val;
 291                         }
 292                 }
 293
 294                 if (ret != -EOVERFLOW) {
 295                         dev_err(&pdev->dev, "Failed to read u32 at index %d of child %s\n",
 296                                         i, child->full_name);
 297                         continue;
 298                 }
 299
 300                 if (audmux_type == IMX31_AUDMUX) {
 301                         if (i % 2) {
 302                                 dev_err(&pdev->dev, "One pdcr value is missing in child node %s\n",
 303                                                 child->full_name);
 304                                 continue;
 305                         }
 306                         imx_audmux_v2_configure_port(port, ptcr, pdcr);
 307                 } else {
 308                         imx_audmux_v1_configure_port(port, pcr);
 309                 }
 310         }
 311
 312         return 0;
 313 }
 314
 315 static int imx_audmux_probe(struct platform_device *pdev)
 316 {
 317         struct resource *res;
 318         const struct of_device_id *of_id =
 319                         of_match_device(imx_audmux_dt_ids, &pdev->dev);
 320
 321         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 322         audmux_base = devm_ioremap_resource(&pdev->dev, res);
 323         if (IS_ERR(audmux_base))
 324                 return PTR_ERR(audmux_base);
 325
 326         audmux_clk = devm_clk_get(&pdev->dev, "audmux");
 327         if (IS_ERR(audmux_clk)) {
 328                 dev_dbg(&pdev->dev, "cannot get clock: %ld\n",
 329                                 PTR_ERR(audmux_clk));
 330                 audmux_clk = NULL;
 331         }
 332
 333         if (of_id)
 334                 pdev->id_entry = of_id->data;
 335         audmux_type = pdev->id_entry->driver_data;
 336         if (audmux_type == IMX31_AUDMUX)
 337                 audmux_debugfs_init();
 338
 339         if (of_id)
 340                 imx_audmux_parse_dt_defaults(pdev, pdev->dev.of_node);
 341
 342         return 0;
 343 }
 344
 345 static int imx_audmux_remove(struct platform_device *pdev)
 346 {
 347         if (audmux_type == IMX31_AUDMUX)
 348                 audmux_debugfs_remove();
 349
 350         return 0;
 351 }
 352
 353 static struct platform_driver imx_audmux_driver = {
 354         .probe          = imx_audmux_probe,
 355         .remove         = imx_audmux_remove,
 356         .id_table       = imx_audmux_ids,
 357         .driver = {
 358                 .name   = DRIVER_NAME,
 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);