arch/mips/pci/ops-mace.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 2000, 2001 Keith M Wesolowski
   7  */
   8 #include <linux/kernel.h>
   9 #include <linux/pci.h>
  10 #include <linux/types.h>
  11 #include <asm/ip32/mace.h>
  12
  13 #if 0
  14 # define DPRINTK(args...) printk(args);
  15 #else
  16 # define DPRINTK(args...)
  17 #endif
  18
  19 /*
  20  * O2 has up to 5 PCI devices connected into the MACE bridge.  The device
  21  * map looks like this:
  22  *
  23  * 0  aic7xxx 0
  24  * 1  aic7xxx 1
  25  * 2  expansion slot
  26  * 3  N/C
  27  * 4  N/C
  28  */
  29
  30 static inline int mkaddr(struct pci_bus *bus, unsigned int devfn,
  31         unsigned int reg)
  32 {
  33         return ((bus->number & 0xff) << 16) |
  34                 ((devfn & 0xff) << 8) |
  35                 (reg & 0xfc);
  36 }
  37
  38
  39 static int
  40 mace_pci_read_config(struct pci_bus *bus, unsigned int devfn,
  41                      int reg, int size, u32 *val)
  42 {
  43         u32 control = mace->pci.control;
  44
  45         /* disable master aborts interrupts during config read */
  46         mace->pci.control = control & ~MACEPCI_CONTROL_MAR_INT;
  47         mace->pci.config_addr = mkaddr(bus, devfn, reg);
  48         switch (size) {
  49         case 1:
  50                 *val = mace->pci.config_data.b[(reg & 3) ^ 3];
  51                 break;
  52         case 2:
  53                 *val = mace->pci.config_data.w[((reg >> 1) & 1) ^ 1];
  54                 break;
  55         case 4:
  56                 *val = mace->pci.config_data.l;
  57                 break;
  58         }
  59         /* ack possible master abort */
  60         mace->pci.error &= ~MACEPCI_ERROR_MASTER_ABORT;
  61         mace->pci.control = control;
  62         /*
  63          * someone forgot to set the ultra bit for the onboard
  64          * scsi chips; we fake it here
  65          */
  66         if (bus->number == 0 && reg == 0x40 && size == 4 &&
  67             (devfn == (1 << 3) || devfn == (2 << 3)))
  68                 *val |= 0x1000;
  69
  70         DPRINTK("read%d: reg=%08x,val=%02x\n", size * 8, reg, *val);
  71
  72         return PCIBIOS_SUCCESSFUL;
  73 }
  74
  75 static int
  76 mace_pci_write_config(struct pci_bus *bus, unsigned int devfn,
  77                       int reg, int size, u32 val)
  78 {
  79         mace->pci.config_addr = mkaddr(bus, devfn, reg);
  80         switch (size) {
  81         case 1:
  82                 mace->pci.config_data.b[(reg & 3) ^ 3] = val;
  83                 break;
  84         case 2:
  85                 mace->pci.config_data.w[((reg >> 1) & 1) ^ 1] = val;
  86                 break;
  87         case 4:
  88                 mace->pci.config_data.l = val;
  89                 break;
  90         }
  91
  92         DPRINTK("write%d: reg=%08x,val=%02x\n", size * 8, reg, val);
  93
  94         return PCIBIOS_SUCCESSFUL;
  95 }
  96
  97 struct pci_ops mace_pci_ops = {
  98         .read = mace_pci_read_config,
  99         .write = mace_pci_write_config,
 100 };