arch/mips/pci/fixup-emma2rh.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Copyright (C) NEC Electronics Corporation 2004-2006
   4  *
   5  *  This file is based on the arch/mips/ddb5xxx/ddb5477/pci.c
   6  *
   7  *      Copyright 2001 MontaVista Software Inc.
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/init.h>
  12 #include <linux/types.h>
  13 #include <linux/pci.h>
  14
  15 #include <asm/bootinfo.h>
  16
  17 #include <asm/emma/emma2rh.h>
  18
  19 #define EMMA2RH_PCI_HOST_SLOT 0x09
  20 #define EMMA2RH_USB_SLOT 0x03
  21 #define PCI_DEVICE_ID_NEC_EMMA2RH      0x014b /* EMMA2RH PCI Host */
  22
  23 /*
  24  * we fix up irqs based on the slot number.
  25  * The first entry is at AD:11.
  26  * Fortunately this works because, although we have two pci buses,
  27  * they all have different slot numbers (except for rockhopper slot 20
  28  * which is handled below).
  29  *
  30  */
  31
  32 #define MAX_SLOT_NUM 10
  33 static unsigned char irq_map[][5] = {
  34         [3] = {0, MARKEINS_PCI_IRQ_INTB, MARKEINS_PCI_IRQ_INTC,
  35                MARKEINS_PCI_IRQ_INTD, 0,},
  36         [4] = {0, MARKEINS_PCI_IRQ_INTA, 0, 0, 0,},
  37         [5] = {0, 0, 0, 0, 0,},
  38         [6] = {0, MARKEINS_PCI_IRQ_INTC, MARKEINS_PCI_IRQ_INTD,
  39                MARKEINS_PCI_IRQ_INTA, MARKEINS_PCI_IRQ_INTB,},
  40 };
  41
  42 static void nec_usb_controller_fixup(struct pci_dev *dev)
  43 {
  44         if (PCI_SLOT(dev->devfn) == EMMA2RH_USB_SLOT)
  45                 /* on board USB controller configuration */
  46                 pci_write_config_dword(dev, 0xe4, 1 << 5);
  47 }
  48
  49 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_USB,
  50                         nec_usb_controller_fixup);
  51
  52 /*
  53  * Prevent the PCI layer from seeing the resources allocated to this device
  54  * if it is the host bridge by marking it as such.  These resources are of
  55  * no consequence to the PCI layer (they are handled elsewhere).
  56  */
  57 static void emma2rh_pci_host_fixup(struct pci_dev *dev)
  58 {
  59         int i;
  60
  61         if (PCI_SLOT(dev->devfn) == EMMA2RH_PCI_HOST_SLOT) {
  62                 dev->class &= 0xff;
  63                 dev->class |= PCI_CLASS_BRIDGE_HOST << 8;
  64                 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
  65                         dev->resource[i].start = 0;
  66                         dev->resource[i].end = 0;
  67                         dev->resource[i].flags = 0;
  68                 }
  69         }
  70 }
  71
  72 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_EMMA2RH,
  73                          emma2rh_pci_host_fixup);
  74
  75 int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
  76 {
  77         return irq_map[slot][pin];
  78 }
  79
  80 /* Do platform specific device initialization at pci_enable_device() time */
  81 int pcibios_plat_dev_init(struct pci_dev *dev)
  82 {
  83         return 0;
  84 }