linux/arch/powerpc/platforms/82xx/pq2.c
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   1/*
   2 * Common PowerQUICC II code.
   3 *
   4 * Author: Scott Wood <scottwood@freescale.com>
   5 * Copyright (c) 2007 Freescale Semiconductor
   6 *
   7 * Based on code by Vitaly Bordug <vbordug@ru.mvista.com>
   8 * pq2_restart fix by Wade Farnsworth <wfarnsworth@mvista.com>
   9 * Copyright (c) 2006 MontaVista Software, Inc.
  10 *
  11 * This program is free software; you can redistribute  it and/or modify it
  12 * under  the terms of  the GNU General  Public License as published by the
  13 * Free Software Foundation;  either version 2 of the  License, or (at your
  14 * option) any later version.
  15 */
  16
  17#include <asm/cpm2.h>
  18#include <asm/io.h>
  19#include <asm/pci-bridge.h>
  20#include <asm/system.h>
  21
  22#include <platforms/82xx/pq2.h>
  23
  24#define RMR_CSRE 0x00000001
  25
  26void pq2_restart(char *cmd)
  27{
  28        local_irq_disable();
  29        setbits32(&cpm2_immr->im_clkrst.car_rmr, RMR_CSRE);
  30
  31        /* Clear the ME,EE,IR & DR bits in MSR to cause checkstop */
  32        mtmsr(mfmsr() & ~(MSR_ME | MSR_EE | MSR_IR | MSR_DR));
  33        in_8(&cpm2_immr->im_clkrst.res[0]);
  34
  35        panic("Restart failed\n");
  36}
  37
  38#ifdef CONFIG_PCI
  39static int pq2_pci_exclude_device(struct pci_controller *hose,
  40                                  u_char bus, u8 devfn)
  41{
  42        if (bus == 0 && PCI_SLOT(devfn) == 0)
  43                return PCIBIOS_DEVICE_NOT_FOUND;
  44        else
  45                return PCIBIOS_SUCCESSFUL;
  46}
  47
  48static void __init pq2_pci_add_bridge(struct device_node *np)
  49{
  50        struct pci_controller *hose;
  51        struct resource r;
  52
  53        if (of_address_to_resource(np, 0, &r) || r.end - r.start < 0x10b)
  54                goto err;
  55
  56        pci_add_flags(PCI_REASSIGN_ALL_BUS);
  57
  58        hose = pcibios_alloc_controller(np);
  59        if (!hose)
  60                return;
  61
  62        hose->dn = np;
  63
  64        setup_indirect_pci(hose, r.start + 0x100, r.start + 0x104, 0);
  65        pci_process_bridge_OF_ranges(hose, np, 1);
  66
  67        return;
  68
  69err:
  70        printk(KERN_ERR "No valid PCI reg property in device tree\n");
  71}
  72
  73void __init pq2_init_pci(void)
  74{
  75        struct device_node *np = NULL;
  76
  77        ppc_md.pci_exclude_device = pq2_pci_exclude_device;
  78
  79        while ((np = of_find_compatible_node(np, NULL, "fsl,pq2-pci")))
  80                pq2_pci_add_bridge(np);
  81}
  82#endif
  83