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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * arch/arm/mach-ixp4xx/miccpt-pci.c
   4  *
   5  * MICCPT board-level PCI initialization
   6  *
   7  * Copyright (C) 2002 Intel Corporation.
   8  * Copyright (C) 2003-2004 MontaVista Software, Inc.
   9  * Copyright (C) 2006 OMICRON electronics GmbH
  10  *
  11  * Author: Michael Jochum <michael.jochum@omicron.at>
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/pci.h>
  16 #include <linux/init.h>
  17 #include <linux/delay.h>
  18 #include <linux/irq.h>
  19 #include <asm/mach/pci.h>
  20 #include <asm/irq.h>
  21 #include <mach/hardware.h>
  22 #include <asm/mach-types.h>
  23
  24 #include "irqs.h"
  25
  26 #define MAX_DEV         4
  27 #define IRQ_LINES       4
  28
  29 /* PCI controller GPIO to IRQ pin mappings */
  30 #define INTA            1
  31 #define INTB            2
  32 #define INTC            3
  33 #define INTD            4
  34
  35
  36 void __init miccpt_pci_preinit(void)
  37 {
  38         irq_set_irq_type(IXP4XX_GPIO_IRQ(INTA), IRQ_TYPE_LEVEL_LOW);
  39         irq_set_irq_type(IXP4XX_GPIO_IRQ(INTB), IRQ_TYPE_LEVEL_LOW);
  40         irq_set_irq_type(IXP4XX_GPIO_IRQ(INTC), IRQ_TYPE_LEVEL_LOW);
  41         irq_set_irq_type(IXP4XX_GPIO_IRQ(INTD), IRQ_TYPE_LEVEL_LOW);
  42         ixp4xx_pci_preinit();
  43 }
  44
  45 static int __init miccpt_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
  46 {
  47         static int pci_irq_table[IRQ_LINES] = {
  48                 IXP4XX_GPIO_IRQ(INTA),
  49                 IXP4XX_GPIO_IRQ(INTB),
  50                 IXP4XX_GPIO_IRQ(INTC),
  51                 IXP4XX_GPIO_IRQ(INTD)
  52         };
  53
  54         if (slot >= 1 && slot <= MAX_DEV && pin >= 1 && pin <= IRQ_LINES)
  55                 return pci_irq_table[(slot + pin - 2) % 4];
  56
  57         return -1;
  58 }
  59
  60 struct hw_pci miccpt_pci __initdata = {
  61         .nr_controllers = 1,
  62         .ops            = &ixp4xx_ops,
  63         .preinit        = miccpt_pci_preinit,
  64         .setup          = ixp4xx_setup,
  65         .map_irq        = miccpt_map_irq,
  66 };
  67
  68 int __init miccpt_pci_init(void)
  69 {
  70         if (machine_is_miccpt())
  71                 pci_common_init(&miccpt_pci);
  72         return 0;
  73 }
  74
  75 subsys_initcall(miccpt_pci_init);