arch/mips/philips/pnx8550/jbs/board_setup.c

   1 /*
   2  *  JBS Specific board startup routines.
   3  *
   4  *  Copyright 2005, Embedded Alley Solutions, Inc
   5  *
   6  *  This program is free software; you can redistribute  it and/or modify it
   7  *  under  the terms of  the GNU General  Public License as published by the
   8  *  Free Software Foundation;  either version 2 of the  License, or (at your
   9  *  option) any later version.
  10  *
  11  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
  12  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
  13  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  14  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
  15  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  16  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
  17  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  18  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
  19  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  20  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  21  *
  22  *  You should have received a copy of the  GNU General Public License along
  23  *  with this program; if not, write  to the Free Software Foundation, Inc.,
  24  *  675 Mass Ave, Cambridge, MA 02139, USA.
  25  */
  26 #include <linux/init.h>
  27 #include <linux/sched.h>
  28 #include <linux/ioport.h>
  29 #include <linux/mm.h>
  30 #include <linux/console.h>
  31 #include <linux/mc146818rtc.h>
  32 #include <linux/delay.h>
  33
  34 #include <asm/cpu.h>
  35 #include <asm/bootinfo.h>
  36 #include <asm/irq.h>
  37 #include <asm/mipsregs.h>
  38 #include <asm/reboot.h>
  39 #include <asm/pgtable.h>
  40
  41 #include <glb.h>
  42
  43 /* CP0 hazard avoidance. */
  44 #define BARRIER __asm__ __volatile__(".set noreorder\n\t" \
  45                                      "nop; nop; nop; nop; nop; nop;\n\t" \
  46                                      ".set reorder\n\t")
  47
  48 void __init board_setup(void)
  49 {
  50         unsigned long config0, configpr;
  51
  52         config0 = read_c0_config();
  53
  54         /* clear all three cache coherency fields */
  55         config0 &= ~(0x7 | (7<<25) | (7<<28));
  56         config0 |= (_page_cachable_default >> _CACHE_SHIFT) |
  57                    (CONF_CM_DEFAULT << 25) | (CONF_CM_DEFAULT << 28);
  58         write_c0_config(config0);
  59         BARRIER;
  60
  61         configpr = read_c0_config7();
  62         configpr |= (1<<19); /* enable tlb */
  63         write_c0_config7(configpr);
  64         BARRIER;
  65 }