arch/arm/mach-ixp4xx/gtwx5715-pci.c

   1 /*
   2  * arch/arm/mach-ixp4xx/gtwx5715-pci.c
   3  *
   4  * Gemtek GTWX5715 (Linksys WRV54G) board setup
   5  *
   6  * Copyright (C) 2004 George T. Joseph
   7  * Derived from Coyote
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * as published by the Free Software Foundation; either version 2
  12  * of the License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  22  *
  23  */
  24
  25 #include <linux/pci.h>
  26 #include <linux/init.h>
  27 #include <linux/delay.h>
  28 #include <linux/irq.h>
  29 #include <asm/mach-types.h>
  30 #include <mach/hardware.h>
  31 #include <asm/mach/pci.h>
  32
  33 #define SLOT0_DEVID     0
  34 #define SLOT1_DEVID     1
  35 #define INTA            10 /* slot 1 has INTA and INTB crossed */
  36 #define INTB            11
  37
  38 /*
  39  * Slot 0 isn't actually populated with a card connector but
  40  * we initialize it anyway in case a future version has the
  41  * slot populated or someone with good soldering skills has
  42  * some free time.
  43  */
  44 void __init gtwx5715_pci_preinit(void)
  45 {
  46         irq_set_irq_type(IXP4XX_GPIO_IRQ(INTA), IRQ_TYPE_LEVEL_LOW);
  47         irq_set_irq_type(IXP4XX_GPIO_IRQ(INTB), IRQ_TYPE_LEVEL_LOW);
  48         ixp4xx_pci_preinit();
  49 }
  50
  51
  52 static int __init gtwx5715_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
  53 {
  54         int rc = -1;
  55
  56         if ((slot == SLOT0_DEVID && pin == 1) ||
  57             (slot == SLOT1_DEVID && pin == 2))
  58                 rc = IXP4XX_GPIO_IRQ(INTA);
  59         else if ((slot == SLOT0_DEVID && pin == 2) ||
  60                  (slot == SLOT1_DEVID && pin == 1))
  61                 rc = IXP4XX_GPIO_IRQ(INTB);
  62
  63         printk(KERN_INFO "%s: Mapped slot %d pin %d to IRQ %d\n",
  64                __func__, slot, pin, rc);
  65         return rc;
  66 }
  67
  68 struct hw_pci gtwx5715_pci __initdata = {
  69         .nr_controllers = 1,
  70         .preinit =        gtwx5715_pci_preinit,
  71         .swizzle =        pci_std_swizzle,
  72         .setup =          ixp4xx_setup,
  73         .scan =           ixp4xx_scan_bus,
  74         .map_irq =        gtwx5715_map_irq,
  75 };
  76
  77 int __init gtwx5715_pci_init(void)
  78 {
  79         if (machine_is_gtwx5715())
  80                 pci_common_init(&gtwx5715_pci);
  81
  82         return 0;
  83 }
  84
  85 subsys_initcall(gtwx5715_pci_init);