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

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Common PowerQUICC II code.
   4  *
   5  * Author: Scott Wood <scottwood@freescale.com>
   6  * Copyright (c) 2007 Freescale Semiconductor
   7  *
   8  * Based on code by Vitaly Bordug <vbordug@ru.mvista.com>
   9  * pq2_restart fix by Wade Farnsworth <wfarnsworth@mvista.com>
  10  * Copyright (c) 2006 MontaVista Software, Inc.
  11  */
  12
  13 #include <linux/kprobes.h>
  14
  15 #include <asm/cpm2.h>
  16 #include <asm/io.h>
  17 #include <asm/pci-bridge.h>
  18
  19 #include <platforms/82xx/pq2.h>
  20
  21 #define RMR_CSRE 0x00000001
  22
  23 void __noreturn pq2_restart(char *cmd)
  24 {
  25         local_irq_disable();
  26         setbits32(&cpm2_immr->im_clkrst.car_rmr, RMR_CSRE);
  27
  28         /* Clear the ME,EE,IR & DR bits in MSR to cause checkstop */
  29         mtmsr(mfmsr() & ~(MSR_ME | MSR_EE | MSR_IR | MSR_DR));
  30         in_8(&cpm2_immr->im_clkrst.res[0]);
  31
  32         panic("Restart failed\n");
  33 }
  34 NOKPROBE_SYMBOL(pq2_restart)
  35
  36 #ifdef CONFIG_PCI
  37 static int pq2_pci_exclude_device(struct pci_controller *hose,
  38                                   u_char bus, u8 devfn)
  39 {
  40         if (bus == 0 && PCI_SLOT(devfn) == 0)
  41                 return PCIBIOS_DEVICE_NOT_FOUND;
  42         else
  43                 return PCIBIOS_SUCCESSFUL;
  44 }
  45
  46 static void __init pq2_pci_add_bridge(struct device_node *np)
  47 {
  48         struct pci_controller *hose;
  49         struct resource r;
  50
  51         if (of_address_to_resource(np, 0, &r) || r.end - r.start < 0x10b)
  52                 goto err;
  53
  54         pci_add_flags(PCI_REASSIGN_ALL_BUS);
  55
  56         hose = pcibios_alloc_controller(np);
  57         if (!hose)
  58                 return;
  59
  60         hose->dn = np;
  61
  62         setup_indirect_pci(hose, r.start + 0x100, r.start + 0x104, 0);
  63         pci_process_bridge_OF_ranges(hose, np, 1);
  64
  65         return;
  66
  67 err:
  68         printk(KERN_ERR "No valid PCI reg property in device tree\n");
  69 }
  70
  71 void __init pq2_init_pci(void)
  72 {
  73         struct device_node *np;
  74
  75         ppc_md.pci_exclude_device = pq2_pci_exclude_device;
  76
  77         for_each_compatible_node(np, NULL, "fsl,pq2-pci")
  78                 pq2_pci_add_bridge(np);
  79 }
  80 #endif