target/linux/ath79/patches-4.14/0015-MIPS-ath79-enable-uart-during-early_prink.patch

   1 From b14f8260724abec6c82970085dece6a143d3a0db Mon Sep 17 00:00:00 2001
   2 From: Gabor Juhos <juhosg@openwrt.org>
   3 Date: Mon, 5 Mar 2018 11:38:21 +0100
   4 Subject: [PATCH 15/27] MIPS: ath79: enable uart during early_prink
   5
   6 Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
   7 ---
   8  arch/mips/ath79/early_printk.c | 44 +++++++++++++++++++++++++++++++++++++++++-
   9  1 file changed, 43 insertions(+), 1 deletion(-)
  10
  11 diff --git a/arch/mips/ath79/early_printk.c b/arch/mips/ath79/early_printk.c
  12 index d1adc59af5bf..ec3978678653 100644
  13 --- a/arch/mips/ath79/early_printk.c
  14 +++ b/arch/mips/ath79/early_printk.c
  15 @@ -58,6 +58,46 @@ static void prom_putchar_dummy(unsigned char ch)
  16         /* nothing to do */
  17  }
  18
  19 +static void prom_enable_uart(u32 id)
  20 +{
  21 +       void __iomem *gpio_base;
  22 +       u32 uart_en;
  23 +       u32 t;
  24 +
  25 +       switch (id) {
  26 +       case REV_ID_MAJOR_AR71XX:
  27 +               uart_en = AR71XX_GPIO_FUNC_UART_EN;
  28 +               break;
  29 +
  30 +       case REV_ID_MAJOR_AR7240:
  31 +       case REV_ID_MAJOR_AR7241:
  32 +       case REV_ID_MAJOR_AR7242:
  33 +               uart_en = AR724X_GPIO_FUNC_UART_EN;
  34 +               break;
  35 +
  36 +       case REV_ID_MAJOR_AR913X:
  37 +               uart_en = AR913X_GPIO_FUNC_UART_EN;
  38 +               break;
  39 +
  40 +       case REV_ID_MAJOR_AR9330:
  41 +       case REV_ID_MAJOR_AR9331:
  42 +               uart_en = AR933X_GPIO_FUNC_UART_EN;
  43 +               break;
  44 +
  45 +       case REV_ID_MAJOR_AR9341:
  46 +       case REV_ID_MAJOR_AR9342:
  47 +       case REV_ID_MAJOR_AR9344:
  48 +               /* TODO */
  49 +       default:
  50 +               return;
  51 +       }
  52 +
  53 +       gpio_base = (void __iomem *)(KSEG1ADDR(AR71XX_GPIO_BASE));
  54 +       t = __raw_readl(gpio_base + AR71XX_GPIO_REG_FUNC);
  55 +       t |= uart_en;
  56 +       __raw_writel(t, gpio_base + AR71XX_GPIO_REG_FUNC);
  57 +}
  58 +
  59  static void prom_putchar_init(void)
  60  {
  61         void __iomem *base;
  62 @@ -88,8 +128,10 @@ static void prom_putchar_init(void)
  63
  64         default:
  65                 _prom_putchar = prom_putchar_dummy;
  66 -               break;
  67 +               return;
  68         }
  69 +
  70 +       prom_enable_uart(id);
  71  }
  72
  73  void prom_putchar(unsigned char ch)
  74 --
  75 2.11.0
  76