target/linux/xburst/patches-2.6.35/013-prom.patch

   1 From c615e4c64389ef138c6a13afa744e09134db2c82 Mon Sep 17 00:00:00 2001
   2 From: Lars-Peter Clausen <lars@metafoo.de>
   3 Date: Sat, 19 Jun 2010 04:08:17 +0000
   4 Subject: [PATCH] MIPS: JZ4740: Add prom support
   5
   6 Add support for initializing arcs_cmdline on JZ4740 based machines and
   7 provides a prom_putchar implementation.
   8
   9 Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
  10 Cc: linux-mips@linux-mips.org
  11 Cc: linux-kernel@vger.kernel.org
  12 Patchwork: https://patchwork.linux-mips.org/patch/1404/
  13 Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
  14 ---
  15  arch/mips/jz4740/prom.c |   68 +++++++++++++++++++++++++++++++++++++++++++++++
  16  1 files changed, 68 insertions(+), 0 deletions(-)
  17  create mode 100644 arch/mips/jz4740/prom.c
  18
  19 --- /dev/null
  20 +++ b/arch/mips/jz4740/prom.c
  21 @@ -0,0 +1,68 @@
  22 +/*
  23 + *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
  24 + *  JZ4740 SoC prom code
  25 + *
  26 + *  This program is free software; you can redistribute it and/or modify it
  27 + *  under  the terms of the GNU General  Public License as published by the
  28 + *  Free Software Foundation;  either version 2 of the License, or (at your
  29 + *  option) any later version.
  30 + *
  31 + *  You should have received a copy of the GNU General Public License along
  32 + *  with this program; if not, write to the Free Software Foundation, Inc.,
  33 + *  675 Mass Ave, Cambridge, MA 02139, USA.
  34 + *
  35 + */
  36 +
  37 +#include <linux/module.h>
  38 +#include <linux/kernel.h>
  39 +#include <linux/init.h>
  40 +#include <linux/string.h>
  41 +
  42 +#include <linux/serial_reg.h>
  43 +
  44 +#include <asm/bootinfo.h>
  45 +#include <asm/mach-jz4740/base.h>
  46 +
  47 +void jz4740_init_cmdline(int argc, char *argv[])
  48 +{
  49 +       unsigned int count = COMMAND_LINE_SIZE - 1;
  50 +       int i;
  51 +       char *dst = &(arcs_cmdline[0]);
  52 +       char *src;
  53 +
  54 +       for (i = 1; i < argc && count; ++i) {
  55 +               src = argv[i];
  56 +               while (*src && count) {
  57 +                       *dst++ = *src++;
  58 +                       --count;
  59 +               }
  60 +               *dst++ = ' ';
  61 +       }
  62 +       if (i > 1)
  63 +               --dst;
  64 +
  65 +       *dst = 0;
  66 +}
  67 +
  68 +void __init prom_init(void)
  69 +{
  70 +       jz4740_init_cmdline((int)fw_arg0, (char **)fw_arg1);
  71 +       mips_machtype = MACH_INGENIC_JZ4740;
  72 +}
  73 +
  74 +void __init prom_free_prom_memory(void)
  75 +{
  76 +}
  77 +
  78 +#define UART_REG(_reg) ((void __iomem *)CKSEG1ADDR(JZ4740_UART0_BASE_ADDR + (_reg << 2)))
  79 +
  80 +void prom_putchar(char c)
  81 +{
  82 +       uint8_t lsr;
  83 +
  84 +       do {
  85 +               lsr = readb(UART_REG(UART_LSR));
  86 +       } while ((lsr & UART_LSR_TEMT) == 0);
  87 +
  88 +       writeb(c, UART_REG(UART_TX));
  89 +}