arch/arm/mach-uniphier/debug-uart/debug-uart.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2016 Masahiro Yamada <yamada.masahiro@socionext.com>
   4  */
   5
   6 #include <common.h>
   7 #include <debug_uart.h>
   8 #include <linux/io.h>
   9 #include <linux/serial_reg.h>
  10
  11 #include "../soc-info.h"
  12 #include "debug-uart.h"
  13
  14 #define UNIPHIER_UART_TX                0x00
  15 #define UNIPHIER_UART_LCR_MCR           0x10
  16 #define UNIPHIER_UART_LSR               0x14
  17 #define UNIPHIER_UART_LDR               0x24
  18
  19 static void _debug_uart_putc(int c)
  20 {
  21         void __iomem *base = (void __iomem *)CONFIG_DEBUG_UART_BASE;
  22
  23         while (!(readl(base + UNIPHIER_UART_LSR) & UART_LSR_THRE))
  24                 ;
  25
  26         writel(c, base + UNIPHIER_UART_TX);
  27 }
  28
  29 void _debug_uart_init(void)
  30 {
  31 #ifdef CONFIG_SPL_BUILD
  32         void __iomem *base = (void __iomem *)CONFIG_DEBUG_UART_BASE;
  33         unsigned int divisor;
  34
  35         switch (uniphier_get_soc_id()) {
  36 #if defined(CONFIG_ARCH_UNIPHIER_LD4)
  37         case UNIPHIER_LD4_ID:
  38                 divisor = uniphier_ld4_debug_uart_init();
  39                 break;
  40 #endif
  41 #if defined(CONFIG_ARCH_UNIPHIER_PRO4)
  42         case UNIPHIER_PRO4_ID:
  43                 divisor = uniphier_pro4_debug_uart_init();
  44                 break;
  45 #endif
  46 #if defined(CONFIG_ARCH_UNIPHIER_SLD8)
  47         case UNIPHIER_SLD8_ID:
  48                 divisor = uniphier_sld8_debug_uart_init();
  49                 break;
  50 #endif
  51 #if defined(CONFIG_ARCH_UNIPHIER_PRO5)
  52         case UNIPHIER_PRO5_ID:
  53                 divisor = uniphier_pro5_debug_uart_init();
  54                 break;
  55 #endif
  56 #if defined(CONFIG_ARCH_UNIPHIER_PXS2)
  57         case UNIPHIER_PXS2_ID:
  58                 divisor = uniphier_pxs2_debug_uart_init();
  59                 break;
  60 #endif
  61 #if defined(CONFIG_ARCH_UNIPHIER_LD6B)
  62         case UNIPHIER_LD6B_ID:
  63                 divisor = uniphier_ld6b_debug_uart_init();
  64                 break;
  65 #endif
  66         default:
  67                 return;
  68         }
  69
  70         writel(UART_LCR_WLEN8 << 8, base + UNIPHIER_UART_LCR_MCR);
  71
  72         writel(divisor, base + UNIPHIER_UART_LDR);
  73 #endif
  74 }
  75 DEBUG_UART_FUNCS