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

   1 From f55a400f4a691f3750eaf7bfcd6ecbf7ed1622f0 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 15/33] MIPS: ath79: enable uart during early_prink
   5
   6 This patch ensures, that the poinmux register is properly setup for the
   7 boot console uart when early_printk is enabled.
   8
   9 Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
  10 Signed-off-by: John Crispin <john@phrozen.org>
  11 ---
  12  arch/mips/ath79/early_printk.c | 44 +++++++++++++++++++++++++++++++++++++++++-
  13  1 file changed, 43 insertions(+), 1 deletion(-)
  14
  15 --- a/arch/mips/ath79/early_printk.c
  16 +++ b/arch/mips/ath79/early_printk.c
  17 @@ -58,6 +58,46 @@ static void prom_putchar_dummy(unsigned
  18         /* nothing to do */
  19  }
  20
  21 +static void prom_enable_uart(u32 id)
  22 +{
  23 +       void __iomem *gpio_base;
  24 +       u32 uart_en;
  25 +       u32 t;
  26 +
  27 +       switch (id) {
  28 +       case REV_ID_MAJOR_AR71XX:
  29 +               uart_en = AR71XX_GPIO_FUNC_UART_EN;
  30 +               break;
  31 +
  32 +       case REV_ID_MAJOR_AR7240:
  33 +       case REV_ID_MAJOR_AR7241:
  34 +       case REV_ID_MAJOR_AR7242:
  35 +               uart_en = AR724X_GPIO_FUNC_UART_EN;
  36 +               break;
  37 +
  38 +       case REV_ID_MAJOR_AR913X:
  39 +               uart_en = AR913X_GPIO_FUNC_UART_EN;
  40 +               break;
  41 +
  42 +       case REV_ID_MAJOR_AR9330:
  43 +       case REV_ID_MAJOR_AR9331:
  44 +               uart_en = AR933X_GPIO_FUNC_UART_EN;
  45 +               break;
  46 +
  47 +       case REV_ID_MAJOR_AR9341:
  48 +       case REV_ID_MAJOR_AR9342:
  49 +       case REV_ID_MAJOR_AR9344:
  50 +               /* TODO */
  51 +       default:
  52 +               return;
  53 +       }
  54 +
  55 +       gpio_base = (void __iomem *)(KSEG1ADDR(AR71XX_GPIO_BASE));
  56 +       t = __raw_readl(gpio_base + AR71XX_GPIO_REG_FUNC);
  57 +       t |= uart_en;
  58 +       __raw_writel(t, gpio_base + AR71XX_GPIO_REG_FUNC);
  59 +}
  60 +
  61  static void prom_putchar_init(void)
  62  {
  63         void __iomem *base;
  64 @@ -92,8 +132,10 @@ static void prom_putchar_init(void)
  65
  66         default:
  67                 _prom_putchar = prom_putchar_dummy;
  68 -               break;
  69 +               return;
  70         }
  71 +
  72 +       prom_enable_uart(id);
  73  }
  74
  75  void prom_putchar(unsigned char ch)