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 #include <linux/pinctrl/consumer.h>
  30
  31 #include "imx-audmux.h"
  32
  33 #define DRIVER_NAME "imx-audmux"
  34
  35 static struct clk *audmux_clk;
  36 static void __iomem *audmux_base;
  37
  38 #define IMX_AUDMUX_V2_PTCR(x)           ((x) * 8)
  39 #define IMX_AUDMUX_V2_PDCR(x)           ((x) * 8 + 4)
  40
  41 #ifdef CONFIG_DEBUG_FS
  42 static struct dentry *audmux_debugfs_root;
  43
  44 /* There is an annoying discontinuity in the SSI numbering with regard
  45  * to the Linux number of the devices */
  46 static const char *audmux_port_string(int port)
  47 {
  48         switch (port) {
  49         case MX31_AUDMUX_PORT1_SSI0:
  50                 return "imx-ssi.0";
  51         case MX31_AUDMUX_PORT2_SSI1:
  52                 return "imx-ssi.1";
  53         case MX31_AUDMUX_PORT3_SSI_PINS_3:
  54                 return "SSI3";
  55         case MX31_AUDMUX_PORT4_SSI_PINS_4:
  56                 return "SSI4";
  57         case MX31_AUDMUX_PORT5_SSI_PINS_5:
  58                 return "SSI5";
  59         case MX31_AUDMUX_PORT6_SSI_PINS_6:
  60                 return "SSI6";
  61         default:
  62                 return "UNKNOWN";
  63         }
  64 }
  65
  66 static ssize_t audmux_read_file(struct file *file, char __user *user_buf,
  67                                 size_t count, loff_t *ppos)
  68 {
  69         ssize_t ret;
  70         char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
  71         int port = (int)file->private_data;
  72         u32 pdcr, ptcr;
  73
  74         if (!buf)
  75                 return -ENOMEM;
  76
  77         if (audmux_clk)
  78                 clk_prepare_enable(audmux_clk);
  79
  80         ptcr = readl(audmux_base + IMX_AUDMUX_V2_PTCR(port));
  81         pdcr = readl(audmux_base + IMX_AUDMUX_V2_PDCR(port));
  82
  83         if (audmux_clk)
  84                 clk_disable_unprepare(audmux_clk);
  85
  86         ret = snprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n",
  87                        pdcr, ptcr);
  88
  89         if (ptcr & IMX_AUDMUX_V2_PTCR_TFSDIR)
  90                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
  91                                 "TxFS output from %s, ",
  92                                 audmux_port_string((ptcr >> 27) & 0x7));
  93         else
  94                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
  95                                 "TxFS input, ");
  96
  97         if (ptcr & IMX_AUDMUX_V2_PTCR_TCLKDIR)
  98                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
  99                                 "TxClk output from %s",
 100                                 audmux_port_string((ptcr >> 22) & 0x7));
 101         else
 102                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
 103                                 "TxClk input");
 104
 105         ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n");
 106
 107         if (ptcr & IMX_AUDMUX_V2_PTCR_SYN) {
 108                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
 109                                 "Port is symmetric");
 110         } else {
 111                 if (ptcr & IMX_AUDMUX_V2_PTCR_RFSDIR)
 112                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
 113                                         "RxFS output from %s, ",
 114                                         audmux_port_string((ptcr >> 17) & 0x7));
 115                 else
 116                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
 117                                         "RxFS input, ");
 118
 119                 if (ptcr & IMX_AUDMUX_V2_PTCR_RCLKDIR)
 120                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
 121                                         "RxClk output from %s",
 122                                         audmux_port_string((ptcr >> 12) & 0x7));
 123                 else
 124                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
 125                                         "RxClk input");
 126         }
 127
 128         ret += snprintf(buf + ret, PAGE_SIZE - ret,
 129                         "\nData received from %s\n",
 130                         audmux_port_string((pdcr >> 13) & 0x7));
 131
 132         ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
 133
 134         kfree(buf);
 135
 136         return ret;
 137 }
 138
 139 static const struct file_operations audmux_debugfs_fops = {
 140         .open = simple_open,
 141         .read = audmux_read_file,
 142         .llseek = default_llseek,
 143 };
 144
 145 static void __init audmux_debugfs_init(void)
 146 {
 147         int i;
 148         char buf[20];
 149
 150         audmux_debugfs_root = debugfs_create_dir("audmux", NULL);
 151         if (!audmux_debugfs_root) {
 152                 pr_warning("Failed to create AUDMUX debugfs root\n");
 153                 return;
 154         }
 155
 156         for (i = 0; i < MX31_AUDMUX_PORT7_SSI_PINS_7 + 1; i++) {
 157                 snprintf(buf, sizeof(buf), "ssi%d", i);
 158                 if (!debugfs_create_file(buf, 0444, audmux_debugfs_root,
 159                                          (void *)i, &audmux_debugfs_fops))
 160                         pr_warning("Failed to create AUDMUX port %d debugfs file\n",
 161                                    i);
 162         }
 163 }
 164
 165 static void audmux_debugfs_remove(void)
 166 {
 167         debugfs_remove_recursive(audmux_debugfs_root);
 168 }
 169 #else
 170 static inline void audmux_debugfs_init(void)
 171 {
 172 }
 173
 174 static inline void audmux_debugfs_remove(void)
 175 {
 176 }
 177 #endif
 178
 179 enum imx_audmux_type {
 180         IMX21_AUDMUX,
 181         IMX31_AUDMUX,
 182 } audmux_type;
 183
 184 static struct platform_device_id imx_audmux_ids[] = {
 185         {
 186                 .name = "imx21-audmux",
 187                 .driver_data = IMX21_AUDMUX,
 188         }, {
 189                 .name = "imx31-audmux",
 190                 .driver_data = IMX31_AUDMUX,
 191         }, {
 192                 /* sentinel */
 193         }
 194 };
 195 MODULE_DEVICE_TABLE(platform, imx_audmux_ids);
 196
 197 static const struct of_device_id imx_audmux_dt_ids[] = {
 198         { .compatible = "fsl,imx21-audmux", .data = &imx_audmux_ids[0], },
 199         { .compatible = "fsl,imx31-audmux", .data = &imx_audmux_ids[1], },
 200         { /* sentinel */ }
 201 };
 202 MODULE_DEVICE_TABLE(of, imx_audmux_dt_ids);
 203
 204 static const uint8_t port_mapping[] = {
 205         0x0, 0x4, 0x8, 0x10, 0x14, 0x1c,
 206 };
 207
 208 int imx_audmux_v1_configure_port(unsigned int port, unsigned int pcr)
 209 {
 210         if (audmux_type != IMX21_AUDMUX)
 211                 return -EINVAL;
 212
 213         if (!audmux_base)
 214                 return -ENOSYS;
 215
 216         if (port >= ARRAY_SIZE(port_mapping))
 217                 return -EINVAL;
 218
 219         writel(pcr, audmux_base + port_mapping[port]);
 220
 221         return 0;
 222 }
 223 EXPORT_SYMBOL_GPL(imx_audmux_v1_configure_port);
 224
 225 int imx_audmux_v2_configure_port(unsigned int port, unsigned int ptcr,
 226                 unsigned int pdcr)
 227 {
 228         if (audmux_type != IMX31_AUDMUX)
 229                 return -EINVAL;
 230
 231         if (!audmux_base)
 232                 return -ENOSYS;
 233
 234         if (audmux_clk)
 235                 clk_prepare_enable(audmux_clk);
 236
 237         writel(ptcr, audmux_base + IMX_AUDMUX_V2_PTCR(port));
 238         writel(pdcr, audmux_base + IMX_AUDMUX_V2_PDCR(port));
 239
 240         if (audmux_clk)
 241                 clk_disable_unprepare(audmux_clk);
 242
 243         return 0;
 244 }
 245 EXPORT_SYMBOL_GPL(imx_audmux_v2_configure_port);
 246
 247 static int imx_audmux_probe(struct platform_device *pdev)
 248 {
 249         struct resource *res;
 250         struct pinctrl *pinctrl;
 251         const struct of_device_id *of_id =
 252                         of_match_device(imx_audmux_dt_ids, &pdev->dev);
 253
 254         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 255         audmux_base = devm_request_and_ioremap(&pdev->dev, res);
 256         if (!audmux_base)
 257                 return -EADDRNOTAVAIL;
 258
 259         pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
 260         if (IS_ERR(pinctrl)) {
 261                 dev_err(&pdev->dev, "setup pinctrl failed!");
 262                 return PTR_ERR(pinctrl);
 263         }
 264
 265         audmux_clk = clk_get(&pdev->dev, "audmux");
 266         if (IS_ERR(audmux_clk)) {
 267                 dev_dbg(&pdev->dev, "cannot get clock: %ld\n",
 268                                 PTR_ERR(audmux_clk));
 269                 audmux_clk = NULL;
 270         }
 271
 272         if (of_id)
 273                 pdev->id_entry = of_id->data;
 274         audmux_type = pdev->id_entry->driver_data;
 275         if (audmux_type == IMX31_AUDMUX)
 276                 audmux_debugfs_init();
 277
 278         return 0;
 279 }
 280
 281 static int imx_audmux_remove(struct platform_device *pdev)
 282 {
 283         if (audmux_type == IMX31_AUDMUX)
 284                 audmux_debugfs_remove();
 285         clk_put(audmux_clk);
 286
 287         return 0;
 288 }
 289
 290 static struct platform_driver imx_audmux_driver = {
 291         .probe          = imx_audmux_probe,
 292         .remove         = imx_audmux_remove,
 293         .id_table       = imx_audmux_ids,
 294         .driver = {
 295                 .name   = DRIVER_NAME,
 296                 .owner  = THIS_MODULE,
 297                 .of_match_table = imx_audmux_dt_ids,
 298         }
 299 };
 300
 301 static int __init imx_audmux_init(void)
 302 {
 303         return platform_driver_register(&imx_audmux_driver);
 304 }
 305 subsys_initcall(imx_audmux_init);
 306
 307 static void __exit imx_audmux_exit(void)
 308 {
 309         platform_driver_unregister(&imx_audmux_driver);
 310 }
 311 module_exit(imx_audmux_exit);
 312
 313 MODULE_DESCRIPTION("Freescale i.MX AUDMUX driver");
 314 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
 315 MODULE_LICENSE("GPL v2");
 316 MODULE_ALIAS("platform:" DRIVER_NAME);