release/src-rt-6.x.4708/linux/linux-2.6.36/arch/arm/plat-mxc/audmux-v1.c

   1 /*
   2  * Copyright 2009 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de>
   3  *
   4  * Initial development of this code was funded by
   5  * Phytec Messtechnik GmbH, http://www.phytec.de
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/err.h>
  20 #include <linux/io.h>
  21 #include <linux/clk.h>
  22 #include <mach/audmux.h>
  23 #include <mach/hardware.h>
  24
  25 static void __iomem *audmux_base;
  26
  27 static unsigned char port_mapping[] = {
  28         0x0, 0x4, 0x8, 0x10, 0x14, 0x1c,
  29 };
  30
  31 int mxc_audmux_v1_configure_port(unsigned int port, unsigned int pcr)
  32 {
  33         if (!audmux_base) {
  34                 printk("%s: not configured\n", __func__);
  35                 return -ENOSYS;
  36         }
  37
  38         if (port >= ARRAY_SIZE(port_mapping))
  39                 return -EINVAL;
  40
  41         writel(pcr, audmux_base + port_mapping[port]);
  42
  43         return 0;
  44 }
  45 EXPORT_SYMBOL_GPL(mxc_audmux_v1_configure_port);
  46
  47 static int mxc_audmux_v1_init(void)
  48 {
  49 #ifdef CONFIG_MACH_MX21
  50         if (cpu_is_mx21())
  51                 audmux_base = MX21_IO_ADDRESS(MX21_AUDMUX_BASE_ADDR);
  52         else
  53 #endif
  54 #ifdef CONFIG_MACH_MX27
  55         if (cpu_is_mx27())
  56                 audmux_base = MX27_IO_ADDRESS(MX27_AUDMUX_BASE_ADDR);
  57         else
  58 #endif
  59                 (void)0;
  60
  61         return 0;
  62 }
  63
  64 postcore_initcall(mxc_audmux_v1_init);