arch/arm/plat-mxc/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 #include <mach/audmux.h>
  28
  29 #define DRIVER_NAME "imx-audmux"
  30
  31 static struct clk *audmux_clk;
  32 static void __iomem *audmux_base;
  33
  34 #define MXC_AUDMUX_V2_PTCR(x)           ((x) * 8)
  35 #define MXC_AUDMUX_V2_PDCR(x)           ((x) * 8 + 4)
  36
  37 #ifdef CONFIG_DEBUG_FS
  38 static struct dentry *audmux_debugfs_root;
  39
  40 static int audmux_open_file(struct inode *inode, struct file *file)
  41 {
  42         file->private_data = inode->i_private;
  43         return 0;
  44 }
  45
  46 /* There is an annoying discontinuity in the SSI numbering with regard
  47  * to the Linux number of the devices */
  48 static const char *audmux_port_string(int port)
  49 {
  50         switch (port) {
  51         case MX31_AUDMUX_PORT1_SSI0:
  52                 return "imx-ssi.0";
  53         case MX31_AUDMUX_PORT2_SSI1:
  54                 return "imx-ssi.1";
  55         case MX31_AUDMUX_PORT3_SSI_PINS_3:
  56                 return "SSI3";
  57         case MX31_AUDMUX_PORT4_SSI_PINS_4:
  58                 return "SSI4";
  59         case MX31_AUDMUX_PORT5_SSI_PINS_5:
  60                 return "SSI5";
  61         case MX31_AUDMUX_PORT6_SSI_PINS_6:
  62                 return "SSI6";
  63         default:
  64                 return "UNKNOWN";
  65         }
  66 }
  67
  68 static ssize_t audmux_read_file(struct file *file, char __user *user_buf,
  69                                 size_t count, loff_t *ppos)
  70 {
  71         ssize_t ret;
  72         char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
  73         int port = (int)file->private_data;
  74         u32 pdcr, ptcr;
  75
  76         if (!buf)
  77                 return -ENOMEM;
  78
  79         if (audmux_clk)
  80                 clk_enable(audmux_clk);
  81
  82         ptcr = readl(audmux_base + MXC_AUDMUX_V2_PTCR(port));
  83         pdcr = readl(audmux_base + MXC_AUDMUX_V2_PDCR(port));
  84
  85         if (audmux_clk)
  86                 clk_disable(audmux_clk);
  87
  88         ret = snprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n",
  89                        pdcr, ptcr);
  90
  91         if (ptcr & MXC_AUDMUX_V2_PTCR_TFSDIR)
  92                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
  93                                 "TxFS output from %s, ",
  94                                 audmux_port_string((ptcr >> 27) & 0x7));
  95         else
  96                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
  97                                 "TxFS input, ");
  98
  99         if (ptcr & MXC_AUDMUX_V2_PTCR_TCLKDIR)
 100                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
 101                                 "TxClk output from %s",
 102                                 audmux_port_string((ptcr >> 22) & 0x7));
 103         else
 104                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
 105                                 "TxClk input");
 106
 107         ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n");
 108
 109         if (ptcr & MXC_AUDMUX_V2_PTCR_SYN) {
 110                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
 111                                 "Port is symmetric");
 112         } else {
 113                 if (ptcr & MXC_AUDMUX_V2_PTCR_RFSDIR)
 114                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
 115                                         "RxFS output from %s, ",
 116                                         audmux_port_string((ptcr >> 17) & 0x7));
 117                 else
 118                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
 119                                         "RxFS input, ");
 120
 121                 if (ptcr & MXC_AUDMUX_V2_PTCR_RCLKDIR)
 122                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
 123                                         "RxClk output from %s",
 124                                         audmux_port_string((ptcr >> 12) & 0x7));
 125                 else
 126                         ret += snprintf(buf + ret, PAGE_SIZE - ret,
 127                                         "RxClk input");
 128         }
 129
 130         ret += snprintf(buf + ret, PAGE_SIZE - ret,
 131                         "\nData received from %s\n",
 132                         audmux_port_string((pdcr >> 13) & 0x7));
 133
 134         ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
 135
 136         kfree(buf);
 137
 138         return ret;
 139 }
 140
 141 static const struct file_operations audmux_debugfs_fops = {
 142         .open = audmux_open_file,
 143         .read = audmux_read_file,
 144         .llseek = default_llseek,
 145 };
 146
 147 static void __init audmux_debugfs_init(void)
 148 {
 149         int i;
 150         char buf[20];
 151
 152         audmux_debugfs_root = debugfs_create_dir("audmux", NULL);
 153         if (!audmux_debugfs_root) {
 154                 pr_warning("Failed to create AUDMUX debugfs root\n");
 155                 return;
 156         }
 157
 158         for (i = 1; i < 8; i++) {
 159                 snprintf(buf, sizeof(buf), "ssi%d", i);
 160                 if (!debugfs_create_file(buf, 0444, audmux_debugfs_root,
 161                                          (void *)i, &audmux_debugfs_fops))
 162                         pr_warning("Failed to create AUDMUX port %d debugfs file\n",
 163                                    i);
 164         }
 165 }
 166
 167 static void __exit audmux_debugfs_remove(void)
 168 {
 169         debugfs_remove_recursive(audmux_debugfs_root);
 170 }
 171 #else
 172 static inline void audmux_debugfs_init(void)
 173 {
 174 }
 175
 176 static inline void audmux_debugfs_remove(void)
 177 {
 178 }
 179 #endif
 180
 181 enum imx_audmux_type {
 182         IMX21_AUDMUX,
 183         IMX31_AUDMUX,
 184 } audmux_type;
 185
 186 static struct platform_device_id imx_audmux_ids[] = {
 187         {
 188                 .name = "imx21-audmux",
 189                 .driver_data = IMX21_AUDMUX,
 190         }, {
 191                 .name = "imx31-audmux",
 192                 .driver_data = IMX31_AUDMUX,
 193         }, {
 194                 /* sentinel */
 195         }
 196 };
 197 MODULE_DEVICE_TABLE(platform, imx_audmux_ids);
 198
 199 static const uint8_t port_mapping[] = {
 200         0x0, 0x4, 0x8, 0x10, 0x14, 0x1c,
 201 };
 202
 203 int mxc_audmux_v1_configure_port(unsigned int port, unsigned int pcr)
 204 {
 205         if (audmux_type != IMX21_AUDMUX)
 206                 return -EINVAL;
 207
 208         if (!audmux_base)
 209                 return -ENOSYS;
 210
 211         if (port >= ARRAY_SIZE(port_mapping))
 212                 return -EINVAL;
 213
 214         writel(pcr, audmux_base + port_mapping[port]);
 215
 216         return 0;
 217 }
 218 EXPORT_SYMBOL_GPL(mxc_audmux_v1_configure_port);
 219
 220 int mxc_audmux_v2_configure_port(unsigned int port, unsigned int ptcr,
 221                 unsigned int pdcr)
 222 {
 223         if (audmux_type != IMX31_AUDMUX)
 224                 return -EINVAL;
 225
 226         if (!audmux_base)
 227                 return -ENOSYS;
 228
 229         if (audmux_clk)
 230                 clk_enable(audmux_clk);
 231
 232         writel(ptcr, audmux_base + MXC_AUDMUX_V2_PTCR(port));
 233         writel(pdcr, audmux_base + MXC_AUDMUX_V2_PDCR(port));
 234
 235         if (audmux_clk)
 236                 clk_disable(audmux_clk);
 237
 238         return 0;
 239 }
 240 EXPORT_SYMBOL_GPL(mxc_audmux_v2_configure_port);
 241
 242 static int __init imx_audmux_probe(struct platform_device *pdev)
 243 {
 244         struct resource *res;
 245
 246         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 247         audmux_base = devm_request_and_ioremap(&pdev->dev, res);
 248         if (!audmux_base)
 249                 return -EADDRNOTAVAIL;
 250
 251         audmux_clk = clk_get(&pdev->dev, "audmux");
 252         if (IS_ERR(audmux_clk)) {
 253                 dev_dbg(&pdev->dev, "cannot get clock: %ld\n",
 254                                 PTR_ERR(audmux_clk));
 255                 audmux_clk = NULL;
 256         }
 257
 258         audmux_type = pdev->id_entry->driver_data;
 259         if (audmux_type == IMX31_AUDMUX)
 260                 audmux_debugfs_init();
 261
 262         return 0;
 263 }
 264
 265 static int __exit imx_audmux_remove(struct platform_device *pdev)
 266 {
 267         if (audmux_type == IMX31_AUDMUX)
 268                 audmux_debugfs_remove();
 269         clk_put(audmux_clk);
 270
 271         return 0;
 272 }
 273
 274 static struct platform_driver imx_audmux_driver = {
 275         .probe          = imx_audmux_probe,
 276         .remove         = __exit_p(imx_audmux_remove),
 277         .id_table       = imx_audmux_ids,
 278         .driver = {
 279                 .name   = DRIVER_NAME,
 280                 .owner  = THIS_MODULE,
 281         }
 282 };
 283
 284 static int __init imx_audmux_init(void)
 285 {
 286         return platform_driver_register(&imx_audmux_driver);
 287 }
 288 subsys_initcall(imx_audmux_init);
 289
 290 static void __exit imx_audmux_exit(void)
 291 {
 292         platform_driver_unregister(&imx_audmux_driver);
 293 }
 294 module_exit(imx_audmux_exit);
 295
 296 MODULE_DESCRIPTION("Freescale i.MX AUDMUX driver");
 297 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
 298 MODULE_LICENSE("GPL v2");
 299 MODULE_ALIAS("platform:" DRIVER_NAME);