target/linux/atheros/patches-2.6.38/101-early-printk-support.patch

   1 --- /dev/null
   2 +++ b/arch/mips/ar231x/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 +#include <asm/addrspace.h>
  16 +
  17 +#include <asm/mach-ar231x/ar2315_regs.h>
  18 +#include <asm/mach-ar231x/ar5312_regs.h>
  19 +#include "devices.h"
  20 +
  21 +static inline void prom_uart_wr(void __iomem *base, unsigned reg,
  22 +                               unsigned char ch)
  23 +{
  24 +       __raw_writeb(ch, base + 4 * reg);
  25 +}
  26 +
  27 +static inline unsigned char prom_uart_rr(void __iomem *base, unsigned reg)
  28 +{
  29 +       return __raw_readb(base + 4 * reg);
  30 +}
  31 +
  32 +void prom_putchar(unsigned char ch)
  33 +{
  34 +       static void __iomem *base;
  35 +
  36 +       if (unlikely(base == NULL)) {
  37 +               if (is_2315())
  38 +                       base = (void __iomem *)(KSEG1ADDR(AR2315_UART0));
  39 +               else
  40 +                       base = (void __iomem *)(KSEG1ADDR(AR531X_UART0));
  41 +       }
  42 +
  43 +       while ((prom_uart_rr(base, UART_LSR) & UART_LSR_THRE) == 0);
  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/ar231x/Makefile
  49 +++ b/arch/mips/ar231x/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_ATHEROS_AR5312) += ar5312.o
  58  obj-$(CONFIG_ATHEROS_AR2315) += ar2315.o
  59 --- a/arch/mips/Kconfig
  60 +++ b/arch/mips/Kconfig
  61 @@ -130,6 +130,7 @@ config ATHEROS_AR231X
  62         select SYS_SUPPORTS_BIG_ENDIAN
  63         select SYS_SUPPORTS_32BIT_KERNEL
  64         select GENERIC_GPIO
  65 +       select SYS_HAS_EARLY_PRINTK
  66         help
  67           Support for AR231x and AR531x based boards
  68