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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * arch/arch/mach-ixp4xx/vulcan-pci.c
   4  *
   5  * Vulcan board-level PCI initialization
   6  *
   7  * Copyright (C) 2010 Marc Zyngier <maz@misterjones.org>
   8  *
   9  * based on ixdp425-pci.c:
  10  *      Copyright (C) 2002 Intel Corporation.
  11  *      Copyright (C) 2003-2004 MontaVista Software, Inc.
  12  */
  13
  14 #include <linux/pci.h>
  15 #include <linux/init.h>
  16 #include <linux/irq.h>
  17 #include <asm/mach/pci.h>
  18 #include <asm/mach-types.h>
  19
  20 #include "irqs.h"
  21
  22 /* PCI controller GPIO to IRQ pin mappings */
  23 #define INTA    2
  24 #define INTB    3
  25
  26 void __init vulcan_pci_preinit(void)
  27 {
  28 #ifndef CONFIG_IXP4XX_INDIRECT_PCI
  29         /*
  30          * Cardbus bridge wants way more than the SoC can actually offer,
  31          * and leaves the whole PCI bus in a mess. Artificially limit it
  32          * to 8MB per region. Of course indirect mode doesn't have this
  33          * limitation...
  34          */
  35         pci_cardbus_mem_size = SZ_8M;
  36         pr_info("Vulcan PCI: limiting CardBus memory size to %dMB\n",
  37                 (int)(pci_cardbus_mem_size >> 20));
  38 #endif
  39         irq_set_irq_type(IXP4XX_GPIO_IRQ(INTA), IRQ_TYPE_LEVEL_LOW);
  40         irq_set_irq_type(IXP4XX_GPIO_IRQ(INTB), IRQ_TYPE_LEVEL_LOW);
  41         ixp4xx_pci_preinit();
  42 }
  43
  44 static int __init vulcan_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
  45 {
  46         if (slot == 1)
  47                 return IXP4XX_GPIO_IRQ(INTA);
  48
  49         if (slot == 2)
  50                 return IXP4XX_GPIO_IRQ(INTB);
  51
  52         return -1;
  53 }
  54
  55 struct hw_pci vulcan_pci __initdata = {
  56         .nr_controllers = 1,
  57         .ops            = &ixp4xx_ops,
  58         .preinit        = vulcan_pci_preinit,
  59         .setup          = ixp4xx_setup,
  60         .map_irq        = vulcan_map_irq,
  61 };
  62
  63 int __init vulcan_pci_init(void)
  64 {
  65         if (machine_is_arcom_vulcan())
  66                 pci_common_init(&vulcan_pci);
  67         return 0;
  68 }
  69
  70 subsys_initcall(vulcan_pci_init);