arch/mips/pci/ops-titan.c

   1 /*
   2  * Copyright 2003 PMC-Sierra
   3  * Author: Manish Lachwani (lachwani@pmc-sierra.com)
   4  *
   5  *  This program is free software; you can redistribute  it and/or modify it
   6  *  under  the terms of  the GNU General  Public License as published by the
   7  *  Free Software Foundation;  either version 2 of the  License, or (at your
   8  *  option) any later version.
   9  *
  10  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
  11  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
  12  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  13  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
  14  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  15  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
  16  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  17  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
  18  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  19  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  20  *
  21  *  You should have received a copy of the  GNU General Public License along
  22  *  with this program; if not, write  to the Free Software Foundation, Inc.,
  23  *  675 Mass Ave, Cambridge, MA 02139, USA.
  24  */
  25 #include <linux/types.h>
  26 #include <linux/pci.h>
  27 #include <linux/kernel.h>
  28
  29 #include <asm/pci.h>
  30 #include <asm/io.h>
  31 #include <asm/rm9k-ocd.h>
  32
  33 /*
  34  * PCI specific defines
  35  */
  36 #define TITAN_PCI_0_CONFIG_ADDRESS      0x780
  37 #define TITAN_PCI_0_CONFIG_DATA         0x784
  38
  39 /*
  40  * Titan PCI Config Read Byte
  41  */
  42 static int titan_read_config(struct pci_bus *bus, unsigned int devfn, int reg,
  43         int size, u32 * val)
  44 {
  45         uint32_t address, tmp;
  46         int dev, busno, func;
  47
  48         busno = bus->number;
  49         dev = PCI_SLOT(devfn);
  50         func = PCI_FUNC(devfn);
  51
  52         address = (busno << 16) | (dev << 11) | (func << 8) |
  53                   (reg & 0xfc) | 0x80000000;
  54
  55
  56         /* start the configuration cycle */
  57         ocd_writel(address, TITAN_PCI_0_CONFIG_ADDRESS);
  58         tmp = ocd_readl(TITAN_PCI_0_CONFIG_DATA) >> ((reg & 3) << 3);
  59
  60         switch (size) {
  61         case 1:
  62                 tmp &= 0xff;
  63         case 2:
  64                 tmp &= 0xffff;
  65         }
  66         *val = tmp;
  67
  68         return PCIBIOS_SUCCESSFUL;
  69 }
  70
  71 static int titan_write_config(struct pci_bus *bus, unsigned int devfn, int reg,
  72         int size, u32 val)
  73 {
  74         uint32_t address;
  75         int dev, busno, func;
  76
  77         busno = bus->number;
  78         dev = PCI_SLOT(devfn);
  79         func = PCI_FUNC(devfn);
  80
  81         address = (busno << 16) | (dev << 11) | (func << 8) |
  82                 (reg & 0xfc) | 0x80000000;
  83
  84         /* start the configuration cycle */
  85         ocd_writel(address, TITAN_PCI_0_CONFIG_ADDRESS);
  86
  87         /* write the data */
  88         switch (size) {
  89         case 1:
  90                 ocd_writeb(val, TITAN_PCI_0_CONFIG_DATA + (~reg & 0x3));
  91                 break;
  92
  93         case 2:
  94                 ocd_writew(val, TITAN_PCI_0_CONFIG_DATA + (~reg & 0x2));
  95                 break;
  96
  97         case 4:
  98                 ocd_writel(val, TITAN_PCI_0_CONFIG_DATA);
  99                 break;
 100         }
 101
 102         return PCIBIOS_SUCCESSFUL;
 103 }
 104
 105 /*
 106  * Titan PCI structure
 107  */
 108 struct pci_ops titan_pci_ops = {
 109         titan_read_config,
 110         titan_write_config,
 111 };