arch/arm/cpu/armv7/uniphier/ph1-pro4/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/sc-regs.h>
  12 #include <asm/arch/sg-regs.h>
  13
  14 #define UART_CLK                73728000
  15 #include <asm/arch/debug-uart.S>
  16
  17 ENTRY(setup_lowlevel_debug)
  18                 ldr             r0, =SC_CLKCTRL
  19                 ldr             r1, [r0]
  20                 orr             r1, r1, #SC_CLKCTRL_CLK_PERI
  21                 str             r1, [r0]
  22
  23                 init_debug_uart r0, r1, r2
  24
  25                 /* UART Port 0 */
  26                 set_pinsel      127, 0, r0, r1
  27                 set_pinsel      128, 0, r0, r1
  28
  29                 ldr             r0, =SG_LOADPINCTRL
  30                 mov             r1, #1
  31                 str             r1, [r0]
  32
  33                 ldr             r0, =SG_IECTRL
  34                 ldr             r1, [r0]
  35                 orr             r1, r1, #1
  36                 str             r1, [r0]
  37
  38                 mov             pc, lr
  39 ENDPROC(setup_lowlevel_debug)