arch/mips/pci/fixup-tx4938.c

   1 /*
   2  * Toshiba rbtx4938 pci routines
   3  * Copyright (C) 2000-2001 Toshiba Corporation
   4  *
   5  * 2003-2005 (c) MontaVista Software, Inc. This file is licensed under the
   6  * terms of the GNU General Public License version 2. This program is
   7  * licensed "as is" without any warranty of any kind, whether express
   8  * or implied.
   9  *
  10  * Support for TX4938 in 2.6 - Manish Lachwani (mlachwani@mvista.com)
  11  */
  12 #include <linux/types.h>
  13 #include <linux/pci.h>
  14 #include <linux/kernel.h>
  15 #include <linux/init.h>
  16
  17 #include <asm/tx4938/rbtx4938.h>
  18
  19 extern struct pci_controller tx4938_pci_controller[];
  20
  21 static int pci_get_irq(const struct pci_dev *dev, int pin)
  22 {
  23         int irq = pin;
  24         u8 slot = PCI_SLOT(dev->devfn);
  25         struct pci_controller *controller = (struct pci_controller *)dev->sysdata;
  26
  27         if (controller == &tx4938_pci_controller[1]) {
  28                 /* TX4938 PCIC1 */
  29                 switch (slot) {
  30                 case TX4938_PCIC_IDSEL_AD_TO_SLOT(31):
  31                         if (tx4938_ccfgptr->pcfg & TX4938_PCFG_ETH0_SEL)
  32                                 return RBTX4938_IRQ_IRC + TX4938_IR_ETH0;
  33                         break;
  34                 case TX4938_PCIC_IDSEL_AD_TO_SLOT(30):
  35                         if (tx4938_ccfgptr->pcfg & TX4938_PCFG_ETH1_SEL)
  36                                 return RBTX4938_IRQ_IRC + TX4938_IR_ETH1;
  37                         break;
  38                 }
  39                 return 0;
  40         }
  41
  42         /* IRQ rotation */
  43         irq--;  /* 0-3 */
  44         if (dev->bus->parent == NULL &&
  45             (slot == TX4938_PCIC_IDSEL_AD_TO_SLOT(23))) {
  46                 /* PCI CardSlot (IDSEL=A23) */
  47                 /* PCIA => PCIA (IDSEL=A23) */
  48                 irq = (irq + 0 + slot) % 4;
  49         } else {
  50                 /* PCI Backplane */
  51                 irq = (irq + 33 - slot) % 4;
  52         }
  53         irq++;  /* 1-4 */
  54
  55         switch (irq) {
  56         case 1:
  57                 irq = RBTX4938_IRQ_IOC_PCIA;
  58                 break;
  59         case 2:
  60                 irq = RBTX4938_IRQ_IOC_PCIB;
  61                 break;
  62         case 3:
  63                 irq = RBTX4938_IRQ_IOC_PCIC;
  64                 break;
  65         case 4:
  66                 irq = RBTX4938_IRQ_IOC_PCID;
  67                 break;
  68         }
  69         return irq;
  70 }
  71
  72 int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
  73 {
  74         unsigned char irq = 0;
  75
  76         irq = pci_get_irq(dev, pin);
  77
  78         printk(KERN_INFO "PCI: 0x%02x:0x%02x(0x%02x,0x%02x) IRQ=%d\n",
  79                dev->bus->number, dev->devfn, PCI_SLOT(dev->devfn),
  80                PCI_FUNC(dev->devfn), irq);
  81
  82         return irq;
  83 }
  84
  85 /*
  86  * Do platform specific device initialization at pci_enable_device() time
  87  */
  88 int pcibios_plat_dev_init(struct pci_dev *dev)
  89 {
  90         return 0;
  91 }
  92