arch/mips/alchemy/common/setup.c

   1 /*
   2  * Copyright 2000, 2007-2008 MontaVista Software Inc.
   3  * Author: MontaVista Software, Inc. <source@mvista.com
   4  *
   5  * Updates to 2.6, Pete Popov, Embedded Alley Solutions, Inc.
   6  *
   7  *  This program is free software; you can redistribute  it and/or modify it
   8  *  under  the terms of  the GNU General  Public License as published by the
   9  *  Free Software Foundation;  either version 2 of the  License, or (at your
  10  *  option) any later version.
  11  *
  12  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
  13  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
  14  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  15  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
  16  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  17  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
  18  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  19  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
  20  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  21  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  22  *
  23  *  You should have received a copy of the  GNU General Public License along
  24  *  with this program; if not, write  to the Free Software Foundation, Inc.,
  25  *  675 Mass Ave, Cambridge, MA 02139, USA.
  26  */
  27
  28 #include <linux/init.h>
  29 #include <linux/ioport.h>
  30 #include <linux/jiffies.h>
  31 #include <linux/module.h>
  32
  33 #include <asm/mipsregs.h>
  34 #include <asm/time.h>
  35
  36 #include <au1000.h>
  37
  38 extern void __init board_setup(void);
  39 extern void set_cpuspec(void);
  40
  41 void __init plat_mem_setup(void)
  42 {
  43         unsigned long est_freq;
  44
  45         /* determine core clock */
  46         est_freq = au1xxx_calc_clock();
  47         est_freq += 5000;    /* round */
  48         est_freq -= est_freq % 10000;
  49         printk(KERN_INFO "(PRId %08x) @ %lu.%02lu MHz\n", read_c0_prid(),
  50                est_freq / 1000000, ((est_freq % 1000000) * 100) / 1000000);
  51
  52         /* this is faster than wasting cycles trying to approximate it */
  53         preset_lpj = (est_freq >> 1) / HZ;
  54
  55         if (au1xxx_cpu_needs_config_od())
  56                 /* Various early Au1xx0 errata corrected by this */
  57                 set_c0_config(1 << 19); /* Set Config[OD] */
  58         else
  59                 /* Clear to obtain best system bus performance */
  60                 clear_c0_config(1 << 19); /* Clear Config[OD] */
  61
  62         board_setup();  /* board specific setup */
  63
  64         /* IO/MEM resources. */
  65         set_io_port_base(0);
  66         ioport_resource.start = IOPORT_RESOURCE_START;
  67         ioport_resource.end = IOPORT_RESOURCE_END;
  68         iomem_resource.start = IOMEM_RESOURCE_START;
  69         iomem_resource.end = IOMEM_RESOURCE_END;
  70 }
  71
  72 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_PCI)
  73 /* This routine should be valid for all Au1x based boards */
  74 phys_t __fixup_bigphys_addr(phys_t phys_addr, phys_t size)
  75 {
  76         unsigned long start = ALCHEMY_PCI_MEMWIN_START;
  77         unsigned long end = ALCHEMY_PCI_MEMWIN_END;
  78
  79         /* Don't fixup 36-bit addresses */
  80         if ((phys_addr >> 32) != 0)
  81                 return phys_addr;
  82
  83         /* Check for PCI memory window */
  84         if (phys_addr >= start && (phys_addr + size - 1) <= end)
  85                 return (phys_t)(AU1500_PCI_MEM_PHYS_ADDR + phys_addr);
  86
  87         /* default nop */
  88         return phys_addr;
  89 }
  90 EXPORT_SYMBOL(__fixup_bigphys_addr);
  91 #endif