arch/arc/include/asm/serial.h

   1 /*
   2  * Copyright (C) 2012 Synopsys, Inc. (www.synopsys.com)
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8
   9 #ifndef _ASM_ARC_SERIAL_H
  10 #define _ASM_ARC_SERIAL_H
  11
  12 /*
  13  * early-8250 requires BASE_BAUD to be defined and includes this header.
  14  * We put in a typical value:
  15  *      (core clk / 16) - i.e. UART samples 16 times per sec.
  16  * Athough in multi-platform-image this might not work, specially if the
  17  * clk driving the UART is different.
  18  * We can't use DeviceTree as this is typically for early serial.
  19  */
  20
  21 #include <asm/clk.h>
  22
  23 #define BASE_BAUD       (arc_get_core_freq() / 16)
  24
  25 /*
  26  * This is definitely going to break early 8250 consoles on multi-platform
  27  * images but hey, it won't add any code complexity for a debug feature of
  28  * one broken driver.
  29  */
  30 #ifdef CONFIG_ARC_PLAT_TB10X
  31 #undef BASE_BAUD
  32 #define BASE_BAUD       (arc_get_core_freq() / 16 / 3)
  33 #endif
  34
  35 #endif /* _ASM_ARC_SERIAL_H */