target/linux/lantiq/patches/106-early_printk.patch

   1 --- a/arch/mips/lantiq/Kconfig
   2 +++ b/arch/mips/lantiq/Kconfig
   3 @@ -33,4 +33,19 @@ endchoice
   4  source "arch/mips/lantiq/falcon/Kconfig"
   5  source "arch/mips/lantiq/xway/Kconfig"
   6
   7 +if EARLY_PRINTK
   8 +choice
   9 +       prompt "Early printk port"
  10 +       default LANTIQ_PROM_ASC1
  11 +       help
  12 +         Choose which serial port is used, until the console driver is loaded
  13 +
  14 +config LANTIQ_PROM_ASC0
  15 +       bool "ASC0"
  16 +
  17 +config LANTIQ_PROM_ASC1
  18 +       bool "ASC1"
  19 +endchoice
  20 +endif
  21 +
  22  endif
  23 --- /dev/null
  24 +++ b/arch/mips/lantiq/early_printk.c
  25 @@ -0,0 +1,68 @@
  26 +/*
  27 + *  This program is free software; you can redistribute it and/or modify it
  28 + *  under the terms of the GNU General Public License version 2 as published
  29 + *  by the Free Software Foundation.
  30 + *
  31 + *  Copyright (C) 2010 John Crispin <blogic@openwrt.org>
  32 + */
  33 +
  34 +#include <linux/init.h>
  35 +#include <linux/cpu.h>
  36 +
  37 +#include <lantiq.h>
  38 +
  39 +#ifdef CONFIG_SOC_LANTIQ_XWAY
  40 +#include <xway.h>
  41 +#ifdef CONFIG_LANTIQ_PROM_ASC0
  42 +#define LQ_ASC_BASE    KSEG1ADDR(LQ_ASC0_BASE)
  43 +#else
  44 +#define LQ_ASC_BASE    KSEG1ADDR(LQ_ASC1_BASE)
  45 +#endif
  46 +
  47 +#elif CONFIG_SOC_LANTIQ_FALCON
  48 +#include <falcon/gpon_reg_base.h>
  49 +#ifdef CONFIG_LANTIQ_PROM_ASC0
  50 +#define LQ_ASC_BASE    GPON_ASC0_BASE
  51 +#else
  52 +#define LQ_ASC_BASE    GPON_ASC1_BASE
  53 +#endif
  54 +
  55 +#endif
  56 +
  57 +#define ASC_BUF                                1024
  58 +#define LQ_ASC_FSTAT           0x0048
  59 +#define LQ_ASC_TBUF                    0x0020
  60 +#define TXMASK                         0x3F00
  61 +#define TXOFFSET                       8
  62 +
  63 +static char buf[ASC_BUF];
  64 +
  65 +void
  66 +prom_putchar(char c)
  67 +{
  68 +       unsigned long flags;
  69 +
  70 +       local_irq_save(flags);
  71 +       while ((lq_r32((u32 *)(LQ_ASC_BASE + LQ_ASC_FSTAT)) & TXMASK) >> TXOFFSET);
  72 +
  73 +       if (c == '\n')
  74 +               lq_w32('\r', (u32 *)(LQ_ASC_BASE + LQ_ASC_TBUF));
  75 +       lq_w32(c, (u32 *)(LQ_ASC_BASE + LQ_ASC_TBUF));
  76 +       local_irq_restore(flags);
  77 +}
  78 +
  79 +void
  80 +early_printf(const char *fmt, ...)
  81 +{
  82 +       va_list args;
  83 +       int l;
  84 +       char *p, *buf_end;
  85 +
  86 +       va_start(args, fmt);
  87 +       l = vsnprintf(buf, ASC_BUF, fmt, args);
  88 +       va_end(args);
  89 +       buf_end = buf + l;
  90 +
  91 +       for (p = buf; p < buf_end; p++)
  92 +               prom_putchar(*p);
  93 +}