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prom.c

/*
 *  RouterBoard 500 specific prom routines
 *
 *  Copyright (C) 2003, Peter Sadik <peter.sadik@idt.com>
 *  Copyright (C) 2005-2006, P.Christeas <p_christ@hol.gr>
 *  Copyright (C) 2007, Gabor Juhos <juhosg@openwrt.org>
 *                Felix Fietkau <nbd@openwrt.org>
 *                Florian Fainelli <florian@openwrt.org>
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version 2
 *  of the License, or (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the
 *  Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 *  Boston, MA  02110-1301, USA.
 *
 */

#include <linux/init.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/console.h>
#include <linux/bootmem.h>
#include <linux/ioport.h>
#include <linux/blkdev.h>

#include <asm/bootinfo.h>
#include <asm/mach-rc32434/ddr.h>
#include <asm/mach-rc32434/prom.h>

unsigned int idt_cpu_freq = 132000000;
EXPORT_SYMBOL(idt_cpu_freq);

static struct resource ddr_reg[] = {
      {
            .name = "ddr-reg",
            .start = DDR0_PHYS_ADDR,
            .end = DDR0_PHYS_ADDR + sizeof(struct ddr_ram),
            .flags = IORESOURCE_MEM,
      }
};

void __init prom_free_prom_memory(void)
{
      /* No prom memory to free */
}

static inline int match_tag(char *arg, const char *tag)
{
      return strncmp(arg, tag, strlen(tag)) == 0;
}

static inline unsigned long tag2ul(char *arg, const char *tag)
{
      char *num;

      num = arg + strlen(tag);
      return simple_strtoul(num, 0, 10);
}

void __init prom_setup_cmdline(void)
{
      char cmd_line[CL_SIZE];
      char *cp, *board;
      int prom_argc;
      char **prom_argv, **prom_envp;
      int i;

      prom_argc = fw_arg0;
      prom_argv = (char **) fw_arg1;
      prom_envp = (char **) fw_arg2;

      cp = cmd_line;
            /* Note: it is common that parameters start
             * at argv[1] and not argv[0],
             * however, our elf loader starts at [0] */
      for (i = 0; i < prom_argc; i++) {
            if (match_tag(prom_argv[i], FREQ_TAG)) {
                  idt_cpu_freq = tag2ul(prom_argv[i], FREQ_TAG);
                  continue;
            }
#ifdef IGNORE_CMDLINE_MEM
            /* parses out the "mem=xx" arg */
            if (match_tag(prom_argv[i], MEM_TAG))
                  continue;
#endif
            if (i > 0)
                  *(cp++) = ' ';
            if (match_tag(prom_argv[i], BOARD_TAG)) {
                  board = prom_argv[i] + strlen(BOARD_TAG);

                  if (match_tag(board, BOARD_RB532A))
                        mips_machtype = MACH_MIKROTIK_RB532A;
                  else
                        mips_machtype = MACH_MIKROTIK_RB532;
            }

            strcpy(cp, prom_argv[i]);
            cp += strlen(prom_argv[i]);
      }
      *(cp++) = ' ';

      i = strlen(arcs_cmdline);
      if (i > 0) {
            *(cp++) = ' ';
            strcpy(cp, arcs_cmdline);
            cp += strlen(arcs_cmdline);
      }
      cmd_line[CL_SIZE-1] = '\0';

      strcpy(arcs_cmdline, cmd_line);
}

void __init prom_init(void)
{
      struct ddr_ram __iomem *ddr;
      phys_t memsize;
      phys_t ddrbase;

      ddr = ioremap_nocache(ddr_reg[0].start,
                  ddr_reg[0].end - ddr_reg[0].start);

      if (!ddr) {
            printk(KERN_ERR "Unable to remap DDR register\n");
            return;
      }

      ddrbase = (phys_t)&ddr->ddrbase;
      memsize = (phys_t)&ddr->ddrmask;
      memsize = 0 - memsize;

      prom_setup_cmdline();

      /* give all RAM to boot allocator,
       * except for the first 0x400 and the last 0x200 bytes */
      add_memory_region(ddrbase + 0x400, memsize - 0x600, BOOT_MEM_RAM);
}

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