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/platform_device.h>
  26 #include <linux/slab.h>
  27
  28 #include "imx-audmux.h"
  29
  30 #define DRIVER_NAME "imx-audmux"
  31
  32 static struct clk *audmux_clk;
  33 static void __iomem *audmux_base;
  34
  35 #define MXC_AUDMUX_V2_PTCR(x)           ((x) * 8)
  36 #define MXC_AUDMUX_V2_PDCR(x)           ((x) * 8 + 4)
  37
  38 #ifdef CONFIG_DEBUG_FS
  39 static struct dentry *audmux_debugfs_root;
  40
  41 static int audmux_open_file(struct inode *inode, struct file *file)
  42 {
  43         file->private_data = inode->i_private;
  44         return 0;
  45 }
  46
  47 /* There is an annoying discontinuity in the SSI numbering with regard
  48  * to the Linux number of the devices */
  49 static const char *audmux_port_string(int port)
  50 {
  51         switch (port) {
  52         case MX31_AUDMUX_PORT1_SSI0:
  53                 return "imx-ssi.0";
  54         case MX31_AUDMUX_PORT2_SSI1:
  55                 return "imx-ssi.1";
  56         case MX31_AUDMUX_PORT3_SSI_PINS_3:
  57                 return "SSI3";
  58         case MX31_AUDMUX_PORT4_SSI_PINS_4:
  59                 return "SSI4";
  60         case MX31_AUDMUX_PORT5_SSI_PINS_5:
  61                 return "SSI5";
  62         case MX31_AUDMUX_PORT6_SSI_PINS_6:
  63                 return "SSI6";
  64         default:
  65                 return "UNKNOWN";
  66         }
  67 }
  68
  69 static ssize_t audmux_read_file(struct file *file, char __user *user_buf,
  70                                 size_t count, loff_t *ppos)
  71 {
  72         ssize_t ret;
  73         char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
  74         int port = (int)file->private_data;
  75         u32 pdcr, ptcr;
  76
  77         if (!buf)
  78                 return -ENOMEM;
  79
  80         if (audmux_clk)
  81                 clk_enable(audmux_clk);
  82
  83         ptcr = readl(audmux_base + MXC_AUDMUX_V2_PTCR(port));
  84         pdcr = readl(audmux_base + MXC_AUDMUX_V2_PDCR(port));
  85
  86         if (audmux_clk)
  87                 clk_disable(audmux_clk);
  88
  89         ret = snprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n",
  90                        pdcr, ptcr);
  91
  92         if (ptcr & MXC_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 & MXC_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 & MXC_AUDMUX_V2_PTCR_SYN) {
 111                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
 112                                 "Port is symmetric");
 113         } else {
 114                 if (ptcr & MXC_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 & MXC_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 = audmux_open_file,
 144         .read = audmux_read_file,
 145         .llseek = default_llseek,
 146 };
 147
 148 static void __init audmux_debugfs_init(void)
 149 {
 150         int 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 = 1; i < 8; i++) {
 160                 snprintf(buf, sizeof(buf), "ssi%d", 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 %d debugfs file\n",
 164                                    i);
 165         }
 166 }
 167
 168 static void __exit 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 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 uint8_t port_mapping[] = {
 201         0x0, 0x4, 0x8, 0x10, 0x14, 0x1c,
 202 };
 203
 204 int mxc_audmux_v1_configure_port(unsigned int port, unsigned int pcr)
 205 {
 206         if (audmux_type != IMX21_AUDMUX)
 207                 return -EINVAL;
 208
 209         if (!audmux_base)
 210                 return -ENOSYS;
 211
 212         if (port >= ARRAY_SIZE(port_mapping))
 213                 return -EINVAL;
 214
 215         writel(pcr, audmux_base + port_mapping[port]);
 216
 217         return 0;
 218 }
 219 EXPORT_SYMBOL_GPL(mxc_audmux_v1_configure_port);
 220
 221 int mxc_audmux_v2_configure_port(unsigned int port, unsigned int ptcr,
 222                 unsigned int pdcr)
 223 {
 224         if (audmux_type != IMX31_AUDMUX)
 225                 return -EINVAL;
 226
 227         if (!audmux_base)
 228                 return -ENOSYS;
 229
 230         if (audmux_clk)
 231                 clk_enable(audmux_clk);
 232
 233         writel(ptcr, audmux_base + MXC_AUDMUX_V2_PTCR(port));
 234         writel(pdcr, audmux_base + MXC_AUDMUX_V2_PDCR(port));
 235
 236         if (audmux_clk)
 237                 clk_disable(audmux_clk);
 238
 239         return 0;
 240 }
 241 EXPORT_SYMBOL_GPL(mxc_audmux_v2_configure_port);
 242
 243 static int __init imx_audmux_probe(struct platform_device *pdev)
 244 {
 245         struct resource *res;
 246
 247         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 248         audmux_base = devm_request_and_ioremap(&pdev->dev, res);
 249         if (!audmux_base)
 250                 return -EADDRNOTAVAIL;
 251
 252         audmux_clk = clk_get(&pdev->dev, "audmux");
 253         if (IS_ERR(audmux_clk)) {
 254                 dev_dbg(&pdev->dev, "cannot get clock: %ld\n",
 255                                 PTR_ERR(audmux_clk));
 256                 audmux_clk = NULL;
 257         }
 258
 259         audmux_type = pdev->id_entry->driver_data;
 260         if (audmux_type == IMX31_AUDMUX)
 261                 audmux_debugfs_init();
 262
 263         return 0;
 264 }
 265
 266 static int __exit imx_audmux_remove(struct platform_device *pdev)
 267 {
 268         if (audmux_type == IMX31_AUDMUX)
 269                 audmux_debugfs_remove();
 270         clk_put(audmux_clk);
 271
 272         return 0;
 273 }
 274
 275 static struct platform_driver imx_audmux_driver = {
 276         .probe          = imx_audmux_probe,
 277         .remove         = __exit_p(imx_audmux_remove),
 278         .id_table       = imx_audmux_ids,
 279         .driver = {
 280                 .name   = DRIVER_NAME,
 281                 .owner  = THIS_MODULE,
 282         }
 283 };
 284
 285 static int __init imx_audmux_init(void)
 286 {
 287         return platform_driver_register(&imx_audmux_driver);
 288 }
 289 subsys_initcall(imx_audmux_init);
 290
 291 static void __exit imx_audmux_exit(void)
 292 {
 293         platform_driver_unregister(&imx_audmux_driver);
 294 }
 295 module_exit(imx_audmux_exit);
 296
 297 MODULE_DESCRIPTION("Freescale i.MX AUDMUX driver");
 298 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
 299 MODULE_LICENSE("GPL v2");
 300 MODULE_ALIAS("platform:" DRIVER_NAME);