arch/arm/include/asm/arch-uniphier/debug-uart.S

   1 /*
   2  * Copyright (C) 2014 Panasonic Corporation
   3  *   Author: Masahiro Yamada <yamada.m@jp.panasonic.com>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <linux/serial_reg.h>
   9
  10 #if !defined(CONFIG_DEBUG_SEMIHOSTING)
  11 #include CONFIG_DEBUG_LL_INCLUDE
  12 #endif
  13
  14 #define BAUDRATE                115200
  15 #define DIV_ROUND(x, d)         (((x) + ((d) / 2)) / (d))
  16 #define DIVISOR                 DIV_ROUND(UART_CLK, 16 * BAUDRATE)
  17
  18         .macro          init_debug_uart, ra, rb, rc
  19         addruart        \ra, \rb, \rc
  20         mov             \rb, #UART_LCR_WLEN8
  21         strb            \rb, [\ra, #0x11]
  22         ldr             \rb, =DIVISOR
  23         str             \rb, [\ra, #0x24]
  24         .endm