arch/mips/pci/fixup-jmr3927.c

   1 /*
   2  *
   3  * BRIEF MODULE DESCRIPTION
   4  *      Board specific pci fixups.
   5  *
   6  * Copyright 2001 MontaVista Software Inc.
   7  * Author: MontaVista Software, Inc.
   8  *              ppopov@mvista.com or source@mvista.com
   9  *
  10  *  This program is free software; you can redistribute  it and/or modify it
  11  *  under  the terms of  the GNU General  Public License as published by the
  12  *  Free Software Foundation;  either version 2 of the  License, or (at your
  13  *  option) any later version.
  14  *
  15  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
  16  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
  17  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  18  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
  19  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
  21  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  22  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
  23  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  *
  26  *  You should have received a copy of the  GNU General Public License along
  27  *  with this program; if not, write  to the Free Software Foundation, Inc.,
  28  *  675 Mass Ave, Cambridge, MA 02139, USA.
  29  */
  30 #include <linux/types.h>
  31 #include <linux/pci.h>
  32 #include <linux/kernel.h>
  33 #include <linux/init.h>
  34
  35 #include <asm/jmr3927/jmr3927.h>
  36
  37 #undef  DEBUG
  38 #ifdef  DEBUG
  39 #define DBG(x...)       printk(x)
  40 #else
  41 #define DBG(x...)
  42 #endif
  43
  44 void __init pcibios_fixup_resources(struct pci_dev *dev)
  45 {
  46         /* will need to fixup IO resources */
  47 }
  48
  49 void __init pcibios_fixup(void)
  50 {
  51         /* nothing to do here */
  52 }
  53
  54 int pci_get_irq(struct pci_dev *dev, int pin)
  55 {
  56         unsigned char irq = pin;
  57
  58         /* IRQ rotation (PICMG) */
  59         irq--;                  /* 0-3 */
  60         if (dev->bus->parent == NULL &&
  61             PCI_SLOT(dev->devfn) == TX3927_PCIC_IDSEL_AD_TO_SLOT(23)) {
  62                 /* PCI CardSlot (IDSEL=A23, DevNu=12) */
  63                 /* PCIA => PCIC (IDSEL=A23) */
  64                 /* NOTE: JMR3927 JP1 must be set to OPEN */
  65                 irq = (irq + 2) % 4;
  66         } else if (dev->bus->parent == NULL &&
  67                    PCI_SLOT(dev->devfn) ==
  68                    TX3927_PCIC_IDSEL_AD_TO_SLOT(22)) {
  69                 /* PCI CardSlot (IDSEL=A22, DevNu=11) */
  70                 /* PCIA => PCIA (IDSEL=A22) */
  71                 /* NOTE: JMR3927 JP1 must be set to OPEN */
  72                 irq = (irq + 0) % 4;
  73         } else {
  74                 /* PCI Backplane */
  75                 irq = (irq + 3 + PCI_SLOT(dev->devfn)) % 4;
  76 #if 0                           /* ??? */
  77                 for (bus = dev->bus; bus->parent != NULL;
  78                      bus = bus->parent) {
  79                         irq = (irq + 3 + PCI_SLOT(bus->self->devfn)) % 4;
  80                 }
  81 #endif
  82         }
  83         irq++;                  /* 1-4 */
  84
  85         switch (irq) {
  86         case 1:
  87                 irq = JMR3927_IRQ_IOC_PCIA;
  88                 break;
  89         case 2:
  90                 // wrong for backplane irq = JMR3927_IRQ_IOC_PCIB;
  91                 irq = JMR3927_IRQ_IOC_PCID;
  92                 break;
  93         case 3:
  94                 irq = JMR3927_IRQ_IOC_PCIC;
  95                 break;
  96         case 4:
  97                 // wrong for backplane irq = JMR3927_IRQ_IOC_PCID;
  98                 irq = JMR3927_IRQ_IOC_PCIB;
  99                 break;
 100         }
 101
 102         /* Check OnBoard Ethernet (IDSEL=A24, DevNu=13) */
 103         if (dev->bus->parent == NULL &&
 104             PCI_SLOT(dev->devfn) == TX3927_PCIC_IDSEL_AD_TO_SLOT(24)) {
 105                 extern int jmr3927_ether1_irq;
 106                 /* check this irq line was reserved for ether1 */
 107                 if (jmr3927_ether1_irq != JMR3927_IRQ_ETHER0)
 108                         irq = JMR3927_IRQ_ETHER0;
 109                 else
 110                         irq = 0;        /* disable */
 111         }
 112         return irq;
 113 }
 114
 115 void __init pcibios_fixup_irqs(void)
 116 {
 117         unsigned char irq;
 118         struct pci_dev *dev;
 119
 120         pci_for_each_dev(dev) {
 121                 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq);
 122                 if (irq == 0)
 123                         return;
 124
 125                 /* SMSC SLC90E66 IDE uses irq 14, 15 (default) */
 126                 if (!(dev->vendor == PCI_VENDOR_ID_EFAR &&
 127                       dev->device == PCI_DEVICE_ID_EFAR_SLC90E66_1)) {
 128                         irq = pci_get_irq(dev, irq);
 129                         pci_write_config_byte(dev, PCI_INTERRUPT_LINE,
 130                                               irq);
 131                 }
 132
 133                 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
 134                 printk(KERN_INFO "PCI: %02x:%02x IRQ %02x\n",
 135                        dev->bus->number, dev->devfn, irq);
 136                 dev->irq = irq;
 137         }
 138 }