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

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Support functions for the SH5 PCI hardware.
   4  *
   5  * Copyright (C) 2001 David J. Mckay (david.mckay@st.com)
   6  * Copyright (C) 2003, 2004 Paul Mundt
   7  * Copyright (C) 2004 Richard Curnow
   8  */
   9 #include <linux/kernel.h>
  10 #include <linux/rwsem.h>
  11 #include <linux/smp.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/init.h>
  14 #include <linux/errno.h>
  15 #include <linux/pci.h>
  16 #include <linux/delay.h>
  17 #include <linux/types.h>
  18 #include <linux/irq.h>
  19 #include <asm/io.h>
  20 #include "pci-sh5.h"
  21
  22 static int sh5pci_read(struct pci_bus *bus, unsigned int devfn, int where,
  23                         int size, u32 *val)
  24 {
  25         SH5PCI_WRITE(PAR, CONFIG_CMD(bus, devfn, where));
  26
  27         switch (size) {
  28                 case 1:
  29                         *val = (u8)SH5PCI_READ_BYTE(PDR + (where & 3));
  30                         break;
  31                 case 2:
  32                         *val = (u16)SH5PCI_READ_SHORT(PDR + (where & 2));
  33                         break;
  34                 case 4:
  35                         *val = SH5PCI_READ(PDR);
  36                         break;
  37         }
  38
  39         return PCIBIOS_SUCCESSFUL;
  40 }
  41
  42 static int sh5pci_write(struct pci_bus *bus, unsigned int devfn, int where,
  43                          int size, u32 val)
  44 {
  45         SH5PCI_WRITE(PAR, CONFIG_CMD(bus, devfn, where));
  46
  47         switch (size) {
  48                 case 1:
  49                         SH5PCI_WRITE_BYTE(PDR + (where & 3), (u8)val);
  50                         break;
  51                 case 2:
  52                         SH5PCI_WRITE_SHORT(PDR + (where & 2), (u16)val);
  53                         break;
  54                 case 4:
  55                         SH5PCI_WRITE(PDR, val);
  56                         break;
  57         }
  58
  59         return PCIBIOS_SUCCESSFUL;
  60 }
  61
  62 struct pci_ops sh5_pci_ops = {
  63         .read           = sh5pci_read,
  64         .write          = sh5pci_write,
  65 };