arch/arm/mach-uniphier/ph1-sld3/lowlevel_debug.S

   1 /*
   2  * On-chip UART initializaion for low-level debugging
   3  *
   4  * Copyright (C) 2014-2015 Masahiro Yamada <yamada.masahiro@socionext.com>
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 #include <linux/linkage.h>
  10 #include <mach/bcu-regs.h>
  11 #include <mach/sc-regs.h>
  12 #include <mach/sg-regs.h>
  13
  14 #define UART_CLK                36864000
  15 #include <mach/debug-uart.S>
  16
  17 ENTRY(setup_lowlevel_debug)
  18                 sg_set_pinsel   63, 0, 4, 4, r0, r1
  19                 sg_set_pinsel   64, 1, 4, 4, r0, r1
  20
  21                 ldr             r0, =BCSCR5
  22                 ldr             r1, =0x24440000
  23                 str             r1, [r0]
  24
  25                 ldr             r0, =SC_CLKCTRL
  26                 ldr             r1, [r0]
  27                 orr             r1, r1, #SC_CLKCTRL_CEN_PERI
  28                 str             r1, [r0]
  29
  30                 init_debug_uart r0, r1, r2
  31
  32                 mov             pc, lr
  33 ENDPROC(setup_lowlevel_debug)