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  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/err.h>
  24 #include <linux/io.h>
  25 #include <linux/clk.h>
  26 #include <mach/audmux.h>
  27 #include <mach/hardware.h>
  28
  29 static void __iomem *audmux_base;
  30
  31 static unsigned char port_mapping[] = {
  32         0x0, 0x4, 0x8, 0x10, 0x14, 0x1c,
  33 };
  34
  35 int mxc_audmux_v1_configure_port(unsigned int port, unsigned int pcr)
  36 {
  37         if (!audmux_base) {
  38                 printk("%s: not configured\n", __func__);
  39                 return -ENOSYS;
  40         }
  41
  42         if (port >= ARRAY_SIZE(port_mapping))
  43                 return -EINVAL;
  44
  45         writel(pcr, audmux_base + port_mapping[port]);
  46
  47         return 0;
  48 }
  49 EXPORT_SYMBOL_GPL(mxc_audmux_v1_configure_port);
  50
  51 static int mxc_audmux_v1_init(void)
  52 {
  53         if (cpu_is_mx27() || cpu_is_mx21())
  54                 audmux_base = IO_ADDRESS(AUDMUX_BASE_ADDR);
  55         return 0;
  56 }
  57
  58 postcore_initcall(mxc_audmux_v1_init);