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 <asm/mach-types.h>
  29 #include <asm/hardware.h>
  30 #include <asm/irq.h>
  31 #include <asm/arch/gtwx5715.h>
  32 #include <asm/mach/pci.h>
  33
  34 extern void ixp4xx_pci_preinit(void);
  35 extern int ixp4xx_setup(int nr, struct pci_sys_data *sys);
  36 extern struct pci_bus *ixp4xx_scan_bus(int nr, struct pci_sys_data *sys);
  37
  38         /*
  39         * The exact GPIO pins and IRQs are defined in arch-ixp4xx/gtwx5715.h
  40         * Slot 0 isn't actually populated with a card connector but
  41         * we initialize it anyway in case a future version has the
  42         * slot populated or someone with good soldering skills has
  43         * some free time.
  44         */
  45
  46
  47 static void gtwx5715_init_gpio(u8 pin, u32 style)
  48 {
  49         gpio_line_config(pin, style | IXP4XX_GPIO_ACTIVE_LOW);
  50
  51         if (style & IXP4XX_GPIO_IN) gpio_line_isr_clear(pin);
  52 }
  53
  54 void __init gtwx5715_pci_preinit(void)
  55 {
  56         gtwx5715_init_gpio(GTWX5715_PCI_SLOT0_INTA_GPIO,        IXP4XX_GPIO_IN);
  57         gtwx5715_init_gpio(GTWX5715_PCI_SLOT1_INTA_GPIO,        IXP4XX_GPIO_IN);
  58
  59         ixp4xx_pci_preinit();
  60 }
  61
  62
  63 static int __init gtwx5715_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
  64 {
  65         int rc;
  66         static int gtwx5715_irqmap
  67                         [GTWX5715_PCI_SLOT_COUNT]
  68                         [GTWX5715_PCI_INT_PIN_COUNT] = {
  69         {GTWX5715_PCI_SLOT0_INTA_IRQ, GTWX5715_PCI_SLOT0_INTB_IRQ},
  70         {GTWX5715_PCI_SLOT1_INTA_IRQ, GTWX5715_PCI_SLOT1_INTB_IRQ},
  71 };
  72
  73         if (slot >= GTWX5715_PCI_SLOT_COUNT ||
  74                         pin >= GTWX5715_PCI_INT_PIN_COUNT) rc = -1;
  75         else
  76                 rc = gtwx5715_irqmap[slot][pin-1];
  77
  78         printk("%s: Mapped slot %d pin %d to IRQ %d\n", __FUNCTION__,slot, pin, rc);
  79         return(rc);
  80 }
  81
  82 struct hw_pci gtwx5715_pci __initdata = {
  83         .nr_controllers = 1,
  84         .preinit =        gtwx5715_pci_preinit,
  85         .swizzle =        pci_std_swizzle,
  86         .setup =          ixp4xx_setup,
  87         .scan =           ixp4xx_scan_bus,
  88         .map_irq =        gtwx5715_map_irq,
  89 };
  90
  91 int __init gtwx5715_pci_init(void)
  92 {
  93         if (machine_is_gtwx5715())
  94         {
  95                 pci_common_init(&gtwx5715_pci);
  96         }
  97
  98         return 0;
  99 }
 100
 101 subsys_initcall(gtwx5715_pci_init);