arch/arm/cpu/armv7/uniphier/ph1-ld4/lowlevel_debug.S

   1 /*
   2  * On-chip UART initializaion for low-level debugging
   3  *
   4  * Copyright (C) 2014 Panasonic Corporation
   5  *   Author: Masahiro Yamada <yamada.m@jp.panasonic.com>
   6  *
   7  * SPDX-License-Identifier:     GPL-2.0+
   8  */
   9
  10 #include <linux/linkage.h>
  11 #include <asm/arch/sg-regs.h>
  12
  13 #define UART_CLK                36864000
  14 #include <asm/arch/debug-uart.S>
  15
  16 ENTRY(setup_lowlevel_debug)
  17                 init_debug_uart r0, r1, r2
  18
  19                 /* UART Port 0 */
  20                 set_pinsel      85, 1, r0, r1
  21                 set_pinsel      88, 1, r0, r1
  22
  23                 ldr             r0, =SG_IECTRL
  24                 ldr             r1, [r0]
  25                 orr             r1, r1, #1
  26                 str             r1, [r0]
  27
  28                 mov             pc, lr
  29 ENDPROC(setup_lowlevel_debug)