target/linux/atheros/patches-3.18/020-early-printk-support.patch

   1 --- /dev/null
   2 +++ b/arch/mips/ath25/early_printk.c
   3 @@ -0,0 +1,44 @@
   4 +/*
   5 + * This file is subject to the terms and conditions of the GNU General Public
   6 + * License.  See the file "COPYING" in the main directory of this archive
   7 + * for more details.
   8 + *
   9 + * Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org>
  10 + */
  11 +
  12 +#include <linux/mm.h>
  13 +#include <linux/io.h>
  14 +#include <linux/serial_reg.h>
  15 +
  16 +#include "devices.h"
  17 +#include "ar2315_regs.h"
  18 +#include "ar5312_regs.h"
  19 +
  20 +static inline void prom_uart_wr(void __iomem *base, unsigned reg,
  21 +                               unsigned char ch)
  22 +{
  23 +       __raw_writel(ch, base + 4 * reg);
  24 +}
  25 +
  26 +static inline unsigned char prom_uart_rr(void __iomem *base, unsigned reg)
  27 +{
  28 +       return __raw_readl(base + 4 * reg);
  29 +}
  30 +
  31 +void prom_putchar(unsigned char ch)
  32 +{
  33 +       static void __iomem *base;
  34 +
  35 +       if (unlikely(base == NULL)) {
  36 +               if (is_ar2315())
  37 +                       base = (void __iomem *)(KSEG1ADDR(AR2315_UART0_BASE));
  38 +               else
  39 +                       base = (void __iomem *)(KSEG1ADDR(AR5312_UART0_BASE));
  40 +       }
  41 +
  42 +       while ((prom_uart_rr(base, UART_LSR) & UART_LSR_THRE) == 0)
  43 +               ;
  44 +       prom_uart_wr(base, UART_TX, ch);
  45 +       while ((prom_uart_rr(base, UART_LSR) & UART_LSR_THRE) == 0)
  46 +               ;
  47 +}
  48 --- a/arch/mips/ath25/Makefile
  49 +++ b/arch/mips/ath25/Makefile
  50 @@ -9,5 +9,8 @@
  51  #
  52
  53  obj-y += board.o prom.o devices.o
  54 +
  55 +obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
  56 +
  57  obj-$(CONFIG_SOC_AR5312) += ar5312.o
  58  obj-$(CONFIG_SOC_AR2315) += ar2315.o
  59 --- a/arch/mips/Kconfig
  60 +++ b/arch/mips/Kconfig
  61 @@ -106,6 +106,7 @@ config ATH25
  62         select SYS_HAS_CPU_MIPS32_R1
  63         select SYS_SUPPORTS_BIG_ENDIAN
  64         select SYS_SUPPORTS_32BIT_KERNEL
  65 +       select SYS_HAS_EARLY_PRINTK
  66         help
  67           Support for Atheros AR231x and Atheros AR531x based boards
  68