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setup.c

/*
 * Copyright 2000, 2007-2008 MontaVista Software Inc.
 * Author: MontaVista Software, Inc. <source@mvista.com
 *
 * Updates to 2.6, Pete Popov, Embedded Alley Solutions, Inc.
 *
 *  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  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
 *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
 *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
 *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *  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.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/jiffies.h>
#include <linux/module.h>
#include <linux/pm.h>

#include <asm/mipsregs.h>
#include <asm/reboot.h>
#include <asm/time.h>

#include <au1000.h>

extern void __init board_setup(void);
extern void au1000_restart(char *);
extern void au1000_halt(void);
extern void au1000_power_off(void);
extern void set_cpuspec(void);

void __init plat_mem_setup(void)
{
      unsigned long est_freq;

      /* determine core clock */
      est_freq = au1xxx_calc_clock();
      est_freq += 5000;    /* round */
      est_freq -= est_freq % 10000;
      printk(KERN_INFO "(PRId %08x) @ %lu.%02lu MHz\n", read_c0_prid(),
             est_freq / 1000000, ((est_freq % 1000000) * 100) / 1000000);

      /* this is faster than wasting cycles trying to approximate it */
      preset_lpj = (est_freq >> 1) / HZ;

      _machine_restart = au1000_restart;
      _machine_halt = au1000_halt;
      pm_power_off = au1000_power_off;

      board_setup();  /* board specific setup */

      if (au1xxx_cpu_needs_config_od())
            /* Various early Au1xx0 errata corrected by this */
            set_c0_config(1 << 19); /* Set Config[OD] */
      else
            /* Clear to obtain best system bus performance */
            clear_c0_config(1 << 19); /* Clear Config[OD] */

      /* IO/MEM resources. */
      set_io_port_base(0);
      ioport_resource.start = IOPORT_RESOURCE_START;
      ioport_resource.end = IOPORT_RESOURCE_END;
      iomem_resource.start = IOMEM_RESOURCE_START;
      iomem_resource.end = IOMEM_RESOURCE_END;
}

#if defined(CONFIG_64BIT_PHYS_ADDR)
/* This routine should be valid for all Au1x based boards */
phys_t __fixup_bigphys_addr(phys_t phys_addr, phys_t size)
{
      /* Don't fixup 36-bit addresses */
      if ((phys_addr >> 32) != 0)
            return phys_addr;

#ifdef CONFIG_PCI
      {
            u32 start = (u32)Au1500_PCI_MEM_START;
            u32 end   = (u32)Au1500_PCI_MEM_END;

            /* Check for PCI memory window */
            if (phys_addr >= start && (phys_addr + size - 1) <= end)
                  return (phys_t)
                         ((phys_addr - start) + Au1500_PCI_MEM_START);
      }
#endif

      /*
       * All Au1xx0 SOCs have a PCMCIA controller.
       * We setup our 32-bit pseudo addresses to be equal to the
       * 36-bit addr >> 4, to make it easier to check the address
       * and fix it.
       * The PCMCIA socket 0 physical attribute address is 0xF 4000 0000.
       * The pseudo address we use is 0xF400 0000. Any address over
       * 0xF400 0000 is a PCMCIA pseudo address.
       */
      if ((phys_addr >= 0xF4000000) && (phys_addr < 0xFFFFFFFF))
            return (phys_t)(phys_addr << 4);

      /* default nop */
      return phys_addr;
}
EXPORT_SYMBOL(__fixup_bigphys_addr);
#endif

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