sound/soc/fsl/imx-audmux.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // Copyright 2012 Freescale Semiconductor, Inc.
   4 // Copyright 2012 Linaro Ltd.
   5 // Copyright 2009 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de>
   6 //
   7 // Initial development of this code was funded by
   8 // Phytec Messtechnik GmbH, https://www.phytec.de
   9
  10 #include <linux/clk.h>
  11 #include <linux/debugfs.h>
  12 #include <linux/err.h>
  13 #include <linux/io.h>
  14 #include <linux/module.h>
  15 #include <linux/of.h>
  16 #include <linux/of_device.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/slab.h>
  19
  20 #include "imx-audmux.h"
  21
  22 #define DRIVER_NAME "imx-audmux"
  23
  24 static struct clk *audmux_clk;
  25 static void __iomem *audmux_base;
  26 static u32 *regcache;
  27 static u32 reg_max;
  28
  29 #define IMX_AUDMUX_V2_PTCR(x)           ((x) * 8)
  30 #define IMX_AUDMUX_V2_PDCR(x)           ((x) * 8 + 4)
  31
  32 #ifdef CONFIG_DEBUG_FS
  33 static struct dentry *audmux_debugfs_root;
  34
  35 /* There is an annoying discontinuity in the SSI numbering with regard
  36  * to the Linux number of the devices */
  37 static const char *audmux_port_string(int port)
  38 {
  39         switch (port) {
  40         case MX31_AUDMUX_PORT1_SSI0:
  41                 return "imx-ssi.0";
  42         case MX31_AUDMUX_PORT2_SSI1:
  43                 return "imx-ssi.1";
  44         case MX31_AUDMUX_PORT3_SSI_PINS_3:
  45                 return "SSI3";
  46         case MX31_AUDMUX_PORT4_SSI_PINS_4:
  47                 return "SSI4";
  48         case MX31_AUDMUX_PORT5_SSI_PINS_5:
  49                 return "SSI5";
  50         case MX31_AUDMUX_PORT6_SSI_PINS_6:
  51                 return "SSI6";
  52         default:
  53                 return "UNKNOWN";
  54         }
  55 }
  56
  57 static ssize_t audmux_read_file(struct file *file, char __user *user_buf,
  58                                 size_t count, loff_t *ppos)
  59 {
  60         ssize_t ret;
  61         char *buf;
  62         uintptr_t port = (uintptr_t)file->private_data;
  63         u32 pdcr, ptcr;
  64
  65         if (audmux_clk) {
  66                 ret = clk_prepare_enable(audmux_clk);
  67                 if (ret)
  68                         return ret;
  69         }
  70
  71         ptcr = readl(audmux_base + IMX_AUDMUX_V2_PTCR(port));
  72         pdcr = readl(audmux_base + IMX_AUDMUX_V2_PDCR(port));
  73
  74         if (audmux_clk)
  75                 clk_disable_unprepare(audmux_clk);
  76
  77         buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
  78         if (!buf)
  79                 return -ENOMEM;
  80
  81         ret = scnprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n",
  82                        pdcr, ptcr);
  83
  84         if (ptcr & IMX_AUDMUX_V2_PTCR_TFSDIR)
  85                 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
  86                                 "TxFS output from %s, ",
  87                                 audmux_port_string((ptcr >> 27) & 0x7));
  88         else
  89                 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
  90                                 "TxFS input, ");
  91
  92         if (ptcr & IMX_AUDMUX_V2_PTCR_TCLKDIR)
  93                 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
  94                                 "TxClk output from %s",
  95                                 audmux_port_string((ptcr >> 22) & 0x7));
  96         else
  97                 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
  98                                 "TxClk input");
  99
 100         ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n");
 101
 102         if (ptcr & IMX_AUDMUX_V2_PTCR_SYN) {
 103                 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
 104                                 "Port is symmetric");
 105         } else {
 106                 if (ptcr & IMX_AUDMUX_V2_PTCR_RFSDIR)
 107                         ret += scnprintf(buf + ret, PAGE_SIZE - ret,
 108                                         "RxFS output from %s, ",
 109                                         audmux_port_string((ptcr >> 17) & 0x7));
 110                 else
 111                         ret += scnprintf(buf + ret, PAGE_SIZE - ret,
 112                                         "RxFS input, ");
 113
 114                 if (ptcr & IMX_AUDMUX_V2_PTCR_RCLKDIR)
 115                         ret += scnprintf(buf + ret, PAGE_SIZE - ret,
 116                                         "RxClk output from %s",
 117                                         audmux_port_string((ptcr >> 12) & 0x7));
 118                 else
 119                         ret += scnprintf(buf + ret, PAGE_SIZE - ret,
 120                                         "RxClk input");
 121         }
 122
 123         ret += scnprintf(buf + ret, PAGE_SIZE - ret,
 124                         "\nData received from %s\n",
 125                         audmux_port_string((pdcr >> 13) & 0x7));
 126
 127         ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
 128
 129         kfree(buf);
 130
 131         return ret;
 132 }
 133
 134 static const struct file_operations audmux_debugfs_fops = {
 135         .open = simple_open,
 136         .read = audmux_read_file,
 137         .llseek = default_llseek,
 138 };
 139
 140 static void audmux_debugfs_init(void)
 141 {
 142         uintptr_t i;
 143         char buf[20];
 144
 145         audmux_debugfs_root = debugfs_create_dir("audmux", NULL);
 146
 147         for (i = 0; i < MX31_AUDMUX_PORT7_SSI_PINS_7 + 1; i++) {
 148                 snprintf(buf, sizeof(buf), "ssi%lu", i);
 149                 debugfs_create_file(buf, 0444, audmux_debugfs_root,
 150                                     (void *)i, &audmux_debugfs_fops);
 151         }
 152 }
 153
 154 static void audmux_debugfs_remove(void)
 155 {
 156         debugfs_remove_recursive(audmux_debugfs_root);
 157 }
 158 #else
 159 static inline void audmux_debugfs_init(void)
 160 {
 161 }
 162
 163 static inline void audmux_debugfs_remove(void)
 164 {
 165 }
 166 #endif
 167
 168 static enum imx_audmux_type {
 169         IMX21_AUDMUX,
 170         IMX31_AUDMUX,
 171 } audmux_type;
 172
 173 static const struct of_device_id imx_audmux_dt_ids[] = {
 174         { .compatible = "fsl,imx21-audmux", .data = (void *)IMX21_AUDMUX, },
 175         { .compatible = "fsl,imx31-audmux", .data = (void *)IMX31_AUDMUX, },
 176         { /* sentinel */ }
 177 };
 178 MODULE_DEVICE_TABLE(of, imx_audmux_dt_ids);
 179
 180 static const uint8_t port_mapping[] = {
 181         0x0, 0x4, 0x8, 0x10, 0x14, 0x1c,
 182 };
 183
 184 int imx_audmux_v1_configure_port(unsigned int port, unsigned int pcr)
 185 {
 186         if (audmux_type != IMX21_AUDMUX)
 187                 return -EINVAL;
 188
 189         if (!audmux_base)
 190                 return -ENOSYS;
 191
 192         if (port >= ARRAY_SIZE(port_mapping))
 193                 return -EINVAL;
 194
 195         writel(pcr, audmux_base + port_mapping[port]);
 196
 197         return 0;
 198 }
 199 EXPORT_SYMBOL_GPL(imx_audmux_v1_configure_port);
 200
 201 int imx_audmux_v2_configure_port(unsigned int port, unsigned int ptcr,
 202                 unsigned int pdcr)
 203 {
 204         int ret;
 205
 206         if (audmux_type != IMX31_AUDMUX)
 207                 return -EINVAL;
 208
 209         if (!audmux_base)
 210                 return -ENOSYS;
 211
 212         if (audmux_clk) {
 213                 ret = clk_prepare_enable(audmux_clk);
 214                 if (ret)
 215                         return ret;
 216         }
 217
 218         writel(ptcr, audmux_base + IMX_AUDMUX_V2_PTCR(port));
 219         writel(pdcr, audmux_base + IMX_AUDMUX_V2_PDCR(port));
 220
 221         if (audmux_clk)
 222                 clk_disable_unprepare(audmux_clk);
 223
 224         return 0;
 225 }
 226 EXPORT_SYMBOL_GPL(imx_audmux_v2_configure_port);
 227
 228 static int imx_audmux_parse_dt_defaults(struct platform_device *pdev,
 229                 struct device_node *of_node)
 230 {
 231         struct device_node *child;
 232
 233         for_each_available_child_of_node(of_node, child) {
 234                 unsigned int port;
 235                 unsigned int ptcr = 0;
 236                 unsigned int pdcr = 0;
 237                 unsigned int pcr = 0;
 238                 unsigned int val;
 239                 int ret;
 240                 int i = 0;
 241
 242                 ret = of_property_read_u32(child, "fsl,audmux-port", &port);
 243                 if (ret) {
 244                         dev_warn(&pdev->dev, "Failed to get fsl,audmux-port of child node \"%pOF\"\n",
 245                                         child);
 246                         continue;
 247                 }
 248                 if (!of_property_read_bool(child, "fsl,port-config")) {
 249                         dev_warn(&pdev->dev, "child node \"%pOF\" does not have property fsl,port-config\n",
 250                                         child);
 251                         continue;
 252                 }
 253
 254                 for (i = 0; (ret = of_property_read_u32_index(child,
 255                                         "fsl,port-config", i, &val)) == 0;
 256                                 ++i) {
 257                         if (audmux_type == IMX31_AUDMUX) {
 258                                 if (i % 2)
 259                                         pdcr |= val;
 260                                 else
 261                                         ptcr |= val;
 262                         } else {
 263                                 pcr |= val;
 264                         }
 265                 }
 266
 267                 if (ret != -EOVERFLOW) {
 268                         dev_err(&pdev->dev, "Failed to read u32 at index %d of child %pOF\n",
 269                                         i, child);
 270                         continue;
 271                 }
 272
 273                 if (audmux_type == IMX31_AUDMUX) {
 274                         if (i % 2) {
 275                                 dev_err(&pdev->dev, "One pdcr value is missing in child node %pOF\n",
 276                                                 child);
 277                                 continue;
 278                         }
 279                         imx_audmux_v2_configure_port(port, ptcr, pdcr);
 280                 } else {
 281                         imx_audmux_v1_configure_port(port, pcr);
 282                 }
 283         }
 284
 285         return 0;
 286 }
 287
 288 static int imx_audmux_probe(struct platform_device *pdev)
 289 {
 290         audmux_base = devm_platform_ioremap_resource(pdev, 0);
 291         if (IS_ERR(audmux_base))
 292                 return PTR_ERR(audmux_base);
 293
 294         audmux_clk = devm_clk_get(&pdev->dev, "audmux");
 295         if (IS_ERR(audmux_clk)) {
 296                 dev_dbg(&pdev->dev, "cannot get clock: %ld\n",
 297                                 PTR_ERR(audmux_clk));
 298                 audmux_clk = NULL;
 299         }
 300
 301         audmux_type = (enum imx_audmux_type)of_device_get_match_data(&pdev->dev);
 302
 303         switch (audmux_type) {
 304         case IMX31_AUDMUX:
 305                 audmux_debugfs_init();
 306                 reg_max = 14;
 307                 break;
 308         case IMX21_AUDMUX:
 309                 reg_max = 6;
 310                 break;
 311         default:
 312                 dev_err(&pdev->dev, "unsupported version!\n");
 313                 return -EINVAL;
 314         }
 315
 316         regcache = devm_kzalloc(&pdev->dev, sizeof(u32) * reg_max, GFP_KERNEL);
 317         if (!regcache)
 318                 return -ENOMEM;
 319
 320         imx_audmux_parse_dt_defaults(pdev, pdev->dev.of_node);
 321
 322         return 0;
 323 }
 324
 325 static int imx_audmux_remove(struct platform_device *pdev)
 326 {
 327         if (audmux_type == IMX31_AUDMUX)
 328                 audmux_debugfs_remove();
 329
 330         return 0;
 331 }
 332
 333 #ifdef CONFIG_PM_SLEEP
 334 static int imx_audmux_suspend(struct device *dev)
 335 {
 336         int i;
 337
 338         clk_prepare_enable(audmux_clk);
 339
 340         for (i = 0; i < reg_max; i++)
 341                 regcache[i] = readl(audmux_base + i * 4);
 342
 343         clk_disable_unprepare(audmux_clk);
 344
 345         return 0;
 346 }
 347
 348 static int imx_audmux_resume(struct device *dev)
 349 {
 350         int i;
 351
 352         clk_prepare_enable(audmux_clk);
 353
 354         for (i = 0; i < reg_max; i++)
 355                 writel(regcache[i], audmux_base + i * 4);
 356
 357         clk_disable_unprepare(audmux_clk);
 358
 359         return 0;
 360 }
 361 #endif /* CONFIG_PM_SLEEP */
 362
 363 static const struct dev_pm_ops imx_audmux_pm = {
 364         SET_SYSTEM_SLEEP_PM_OPS(imx_audmux_suspend, imx_audmux_resume)
 365 };
 366
 367 static struct platform_driver imx_audmux_driver = {
 368         .probe          = imx_audmux_probe,
 369         .remove         = imx_audmux_remove,
 370         .driver = {
 371                 .name   = DRIVER_NAME,
 372                 .pm = &imx_audmux_pm,
 373                 .of_match_table = imx_audmux_dt_ids,
 374         }
 375 };
 376
 377 static int __init imx_audmux_init(void)
 378 {
 379         return platform_driver_register(&imx_audmux_driver);
 380 }
 381 subsys_initcall(imx_audmux_init);
 382
 383 static void __exit imx_audmux_exit(void)
 384 {
 385         platform_driver_unregister(&imx_audmux_driver);
 386 }
 387 module_exit(imx_audmux_exit);
 388
 389 MODULE_DESCRIPTION("Freescale i.MX AUDMUX driver");
 390 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
 391 MODULE_LICENSE("GPL v2");
 392 MODULE_ALIAS("platform:" DRIVER_NAME);