arch/arm/mach-rockchip/rk3036/rk3036.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2019 Rockchip Electronics Co., Ltd
   4  */
   5 #include <asm/io.h>
   6 #include <asm/arch-rockchip/grf_rk3036.h>
   7 #include <asm/arch-rockchip/hardware.h>
   8
   9 #ifdef CONFIG_DEBUG_UART_BOARD_INIT
  10 void board_debug_uart_init(void)
  11 {
  12 #define GRF_BASE        0x20008000
  13         struct rk3036_grf * const grf = (void *)GRF_BASE;
  14         enum {
  15                 GPIO1C3_SHIFT           = 6,
  16                 GPIO1C3_MASK            = 3 << GPIO1C3_SHIFT,
  17                 GPIO1C3_GPIO            = 0,
  18                 GPIO1C3_MMC0_D1,
  19                 GPIO1C3_UART2_SOUT,
  20
  21                 GPIO1C2_SHIFT           = 4,
  22                 GPIO1C2_MASK            = 3 << GPIO1C2_SHIFT,
  23                 GPIO1C2_GPIO            = 0,
  24                 GPIO1C2_MMC0_D0,
  25                 GPIO1C2_UART2_SIN,
  26         };
  27         /*
  28          * NOTE: sd card and debug uart use same iomux in rk3036,
  29          * so if you enable uart,
  30          * you can not boot from sdcard
  31          */
  32         rk_clrsetreg(&grf->gpio1c_iomux,
  33                      GPIO1C3_MASK << GPIO1C3_SHIFT |
  34                      GPIO1C2_MASK << GPIO1C2_SHIFT,
  35                      GPIO1C3_UART2_SOUT << GPIO1C3_SHIFT |
  36                      GPIO1C2_UART2_SIN << GPIO1C2_SHIFT);
  37 }
  38 #endif