arch/powerpc/platforms/82xx/pq2.c

   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
  21 #include <platforms/82xx/pq2.h>
  22
  23 #define RMR_CSRE 0x00000001
  24
  25 void __noreturn pq2_restart(char *cmd)
  26 {
  27         local_irq_disable();
  28         setbits32(&cpm2_immr->im_clkrst.car_rmr, RMR_CSRE);
  29
  30         /* Clear the ME,EE,IR & DR bits in MSR to cause checkstop */
  31         mtmsr(mfmsr() & ~(MSR_ME | MSR_EE | MSR_IR | MSR_DR));
  32         in_8(&cpm2_immr->im_clkrst.res[0]);
  33
  34         panic("Restart failed\n");
  35 }
  36
  37 #ifdef CONFIG_PCI
  38 static int pq2_pci_exclude_device(struct pci_controller *hose,
  39                                   u_char bus, u8 devfn)
  40 {
  41         if (bus == 0 && PCI_SLOT(devfn) == 0)
  42                 return PCIBIOS_DEVICE_NOT_FOUND;
  43         else
  44                 return PCIBIOS_SUCCESSFUL;
  45 }
  46
  47 static void __init pq2_pci_add_bridge(struct device_node *np)
  48 {
  49         struct pci_controller *hose;
  50         struct resource r;
  51
  52         if (of_address_to_resource(np, 0, &r) || r.end - r.start < 0x10b)
  53                 goto err;
  54
  55         pci_add_flags(PCI_REASSIGN_ALL_BUS);
  56
  57         hose = pcibios_alloc_controller(np);
  58         if (!hose)
  59                 return;
  60
  61         hose->dn = np;
  62
  63         setup_indirect_pci(hose, r.start + 0x100, r.start + 0x104, 0);
  64         pci_process_bridge_OF_ranges(hose, np, 1);
  65
  66         return;
  67
  68 err:
  69         printk(KERN_ERR "No valid PCI reg property in device tree\n");
  70 }
  71
  72 void __init pq2_init_pci(void)
  73 {
  74         struct device_node *np;
  75
  76         ppc_md.pci_exclude_device = pq2_pci_exclude_device;
  77
  78         for_each_compatible_node(np, NULL, "fsl,pq2-pci")
  79                 pq2_pci_add_bridge(np);
  80 }
  81 #endif