arch/sh/drivers/pci/ops-sh5.c

   1 /*
   2  * Support functions for the SH5 PCI hardware.
   3  *
   4  * Copyright (C) 2001 David J. Mckay (david.mckay@st.com)
   5  * Copyright (C) 2003, 2004 Paul Mundt
   6  * Copyright (C) 2004 Richard Curnow
   7  *
   8  * May be copied or modified under the terms of the GNU General Public
   9  * License.  See linux/COPYING for more information.
  10  */
  11 #include <linux/kernel.h>
  12 #include <linux/rwsem.h>
  13 #include <linux/smp.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/init.h>
  16 #include <linux/errno.h>
  17 #include <linux/pci.h>
  18 #include <linux/delay.h>
  19 #include <linux/types.h>
  20 #include <linux/irq.h>
  21 #include <asm/io.h>
  22 #include "pci-sh5.h"
  23
  24 static int sh5pci_read(struct pci_bus *bus, unsigned int devfn, int where,
  25                         int size, u32 *val)
  26 {
  27         SH5PCI_WRITE(PAR, CONFIG_CMD(bus, devfn, where));
  28
  29         switch (size) {
  30                 case 1:
  31                         *val = (u8)SH5PCI_READ_BYTE(PDR + (where & 3));
  32                         break;
  33                 case 2:
  34                         *val = (u16)SH5PCI_READ_SHORT(PDR + (where & 2));
  35                         break;
  36                 case 4:
  37                         *val = SH5PCI_READ(PDR);
  38                         break;
  39         }
  40
  41         return PCIBIOS_SUCCESSFUL;
  42 }
  43
  44 static int sh5pci_write(struct pci_bus *bus, unsigned int devfn, int where,
  45                          int size, u32 val)
  46 {
  47         SH5PCI_WRITE(PAR, CONFIG_CMD(bus, devfn, where));
  48
  49         switch (size) {
  50                 case 1:
  51                         SH5PCI_WRITE_BYTE(PDR + (where & 3), (u8)val);
  52                         break;
  53                 case 2:
  54                         SH5PCI_WRITE_SHORT(PDR + (where & 2), (u16)val);
  55                         break;
  56                 case 4:
  57                         SH5PCI_WRITE(PDR, val);
  58                         break;
  59         }
  60
  61         return PCIBIOS_SUCCESSFUL;
  62 }
  63
  64 struct pci_ops sh5_pci_ops = {
  65         .read           = sh5pci_read,
  66         .write          = sh5pci_write,
  67 };