kernel/genarch/include/drivers/am335x/ctrl_module.h

   1 /*
   2  * Copyright (c) 2013 Maurizio Lombardi
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * - Redistributions of source code must retain the above copyright
  10  *   notice, this list of conditions and the following disclaimer.
  11  * - Redistributions in binary form must reproduce the above copyright
  12  *   notice, this list of conditions and the following disclaimer in the
  13  *   documentation and/or other materials provided with the distribution.
  14  * - The name of the author may not be used to endorse or promote products
  15  *   derived from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28 /** @addtogroup genarch
  29  * @{
  30  */
  31 /**
  32  * @file
  33  * @brief Texas Instruments AM335x control module.
  34  */
  35
  36 #ifndef _KERN_AM335X_CTRL_MODULE_H_
  37 #define _KERN_AM335X_CTRL_MODULE_H_
  38
  39 #include <drivers/am335x/ctrl_module_regs.h>
  40
  41 #define AM335x_CTRL_MODULE_BASE_ADDRESS  0x44E10000
  42 #define AM335x_CTRL_MODULE_SIZE          131072 /* 128 Kb */
  43
  44 static unsigned am335x_ctrl_module_clock_freq_get(void *base)
  45 {
  46         unsigned const control_status = AM335x_CTRL_MODULE_REG_ADDR(base,
  47             CONTROL_SYSCONFIG);
  48         unsigned const sysboot = (control_status >> 22) & 0x03;
  49
  50         switch (sysboot) {
  51         default:
  52         case 0:
  53                 return 19200000; /* 19.2 Mhz */
  54         case 1:
  55                 return 24000000; /* 24 Mhz */
  56         case 2:
  57                 return 25000000; /* 25 Mhz */
  58         case 3:
  59                 return 26000000; /* 26 Mhz */
  60         }
  61 }
  62
  63 #endif
  64
  65 /**
  66  * @}
  67  */