arch/arm/mach-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 <mach/sc-regs.h>
  12 #include <mach/sg-regs.h>
  13
  14 #define UART_CLK                73728000
  15 #include <mach/debug-uart.S>
  16
  17 ENTRY(setup_lowlevel_debug)
  18                 /* UART Port 0 */
  19                 sg_set_pinsel   127, 0, 4, 8, r0, r1
  20                 sg_set_pinsel   128, 0, 4, 8, r0, r1
  21
  22                 ldr             r0, =SG_LOADPINCTRL
  23                 mov             r1, #1
  24                 str             r1, [r0]
  25
  26                 ldr             r0, =SC_CLKCTRL
  27                 ldr             r1, [r0]
  28                 orr             r1, r1, #SC_CLKCTRL_CEN_PERI
  29                 str             r1, [r0]
  30
  31                 init_debug_uart r0, r1, r2
  32
  33                 mov             pc, lr
  34 ENDPROC(setup_lowlevel_debug)