include/asm-arm/arch-ixp2000/system.h

   1 /*
   2  * linux/include/asm-arm/arch-ixp2000/system.h
   3  *
   4  * Copyright (C) 2002 Intel Corp.
   5  * Copyricht (C) 2003-2005 MontaVista Software, Inc.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <asm/hardware.h>
  13 #include <asm/mach-types.h>
  14
  15 static inline void arch_idle(void)
  16 {
  17         cpu_do_idle();
  18 }
  19
  20 static inline void arch_reset(char mode)
  21 {
  22         local_irq_disable();
  23
  24         /*
  25          * Reset flash banking register so that we are pointing at
  26          * RedBoot bank.
  27          */
  28         if (machine_is_ixdp2401()) {
  29                 *IXDP2X01_CPLD_FLASH_REG = ((0 >> IXDP2X01_FLASH_WINDOW_BITS)
  30                                                 | IXDP2X01_CPLD_FLASH_INTERN);
  31                 *IXDP2X01_CPLD_RESET_REG = 0xffffffff;
  32         }
  33
  34         /*
  35          * On IXDP2801 we need to write this magic sequence to the CPLD
  36          * to cause a complete reset of the CPU and all external devices
  37          * and moves the flash bank register back to 0.
  38          */
  39         if (machine_is_ixdp2801()) {
  40                 unsigned long reset_reg = *IXDP2X01_CPLD_RESET_REG;
  41                 reset_reg = 0x55AA0000 | (reset_reg & 0x0000FFFF);
  42                 *IXDP2X01_CPLD_RESET_REG = reset_reg;
  43                 mb();
  44                 *IXDP2X01_CPLD_RESET_REG = 0x80000000;
  45         }
  46
  47         /*
  48          * We do a reset all if we are PCI master. We could be a slave and we
  49          * don't want to do anything funky on the PCI bus.
  50          */
  51         if (*IXP2000_STRAP_OPTIONS & CFG_PCI_BOOT_HOST) {
  52                 *(IXP2000_RESET0) |= (RSTALL);
  53         }
  54 }