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_base)
  78                 return -ENOSYS;
  79
  80         if (audmux_clk)
  81                 clk_prepare_enable(audmux_clk);
  82
  83         ptcr = readl(audmux_base + IMX_AUDMUX_V2_PTCR(port));
  84         pdcr = readl(audmux_base + IMX_AUDMUX_V2_PDCR(port));
  85
  86         if (audmux_clk)
  87                 clk_disable_unprepare(audmux_clk);
  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 __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 = 0; i < MX31_AUDMUX_PORT6_SSI_PINS_6 + 1; 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 __devexit 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 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         if (audmux_type != IMX31_AUDMUX)
 232                 return -EINVAL;
 233
 234         if (!audmux_base)
 235                 return -ENOSYS;
 236
 237         if (audmux_clk)
 238                 clk_prepare_enable(audmux_clk);
 239
 240         writel(ptcr, audmux_base + IMX_AUDMUX_V2_PTCR(port));
 241         writel(pdcr, audmux_base + IMX_AUDMUX_V2_PDCR(port));
 242
 243         if (audmux_clk)
 244                 clk_disable_unprepare(audmux_clk);
 245
 246         return 0;
 247 }
 248 EXPORT_SYMBOL_GPL(imx_audmux_v2_configure_port);
 249
 250 static int __devinit imx_audmux_probe(struct platform_device *pdev)
 251 {
 252         struct resource *res;
 253         struct pinctrl *pinctrl;
 254         const struct of_device_id *of_id =
 255                         of_match_device(imx_audmux_dt_ids, &pdev->dev);
 256
 257         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 258         audmux_base = devm_request_and_ioremap(&pdev->dev, res);
 259         if (!audmux_base)
 260                 return -EADDRNOTAVAIL;
 261
 262         pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
 263         if (IS_ERR(pinctrl)) {
 264                 dev_err(&pdev->dev, "setup pinctrl failed!");
 265                 return PTR_ERR(pinctrl);
 266         }
 267
 268         audmux_clk = clk_get(&pdev->dev, "audmux");
 269         if (IS_ERR(audmux_clk)) {
 270                 dev_dbg(&pdev->dev, "cannot get clock: %ld\n",
 271                                 PTR_ERR(audmux_clk));
 272                 audmux_clk = NULL;
 273         }
 274
 275         if (of_id)
 276                 pdev->id_entry = of_id->data;
 277         audmux_type = pdev->id_entry->driver_data;
 278         if (audmux_type == IMX31_AUDMUX)
 279                 audmux_debugfs_init();
 280
 281         return 0;
 282 }
 283
 284 static int __devexit imx_audmux_remove(struct platform_device *pdev)
 285 {
 286         if (audmux_type == IMX31_AUDMUX)
 287                 audmux_debugfs_remove();
 288         clk_put(audmux_clk);
 289
 290         return 0;
 291 }
 292
 293 static struct platform_driver imx_audmux_driver = {
 294         .probe          = imx_audmux_probe,
 295         .remove         = __devexit_p(imx_audmux_remove),
 296         .id_table       = imx_audmux_ids,
 297         .driver = {
 298                 .name   = DRIVER_NAME,
 299                 .owner  = THIS_MODULE,
 300                 .of_match_table = imx_audmux_dt_ids,
 301         }
 302 };
 303
 304 static int __init imx_audmux_init(void)
 305 {
 306         return platform_driver_register(&imx_audmux_driver);
 307 }
 308 subsys_initcall(imx_audmux_init);
 309
 310 static void __exit imx_audmux_exit(void)
 311 {
 312         platform_driver_unregister(&imx_audmux_driver);
 313 }
 314 module_exit(imx_audmux_exit);
 315
 316 MODULE_DESCRIPTION("Freescale i.MX AUDMUX driver");
 317 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
 318 MODULE_LICENSE("GPL v2");
 319 MODULE_ALIAS("platform:" DRIVER_NAME);