LXR linux/arch/arm/mach-ixp4xx/avila-pci.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * arch/arm/mach-ixp4xx/avila-pci.c
   4 *
   5 * Gateworks Avila board-level PCI initialization
   6 *
   7 * Author: Michael-Luke Jones <mlj28@cam.ac.uk>
   8 *
   9 * Based on ixdp-pci.c
  10 * Copyright (C) 2002 Intel Corporation.
  11 * Copyright (C) 2003-2004 MontaVista Software, Inc.
  12 *
  13 * Maintainer: Deepak Saxena <dsaxena@plexity.net>
  14 */
  15
  16#include <linux/kernel.h>
  17#include <linux/pci.h>
  18#include <linux/init.h>
  19#include <linux/irq.h>
  20#include <linux/delay.h>
  21#include <asm/mach/pci.h>
  22#include <asm/irq.h>
  23#include <mach/hardware.h>
  24#include <asm/mach-types.h>
  25
  26#include "irqs.h"
  27
  28#define AVILA_MAX_DEV   4
  29#define LOFT_MAX_DEV    6
  30#define IRQ_LINES       4
  31
  32/* PCI controller GPIO to IRQ pin mappings */
  33#define INTA            11
  34#define INTB            10
  35#define INTC            9
  36#define INTD            8
  37
  38void __init avila_pci_preinit(void)
  39{
  40        irq_set_irq_type(IXP4XX_GPIO_IRQ(INTA), IRQ_TYPE_LEVEL_LOW);
  41        irq_set_irq_type(IXP4XX_GPIO_IRQ(INTB), IRQ_TYPE_LEVEL_LOW);
  42        irq_set_irq_type(IXP4XX_GPIO_IRQ(INTC), IRQ_TYPE_LEVEL_LOW);
  43        irq_set_irq_type(IXP4XX_GPIO_IRQ(INTD), IRQ_TYPE_LEVEL_LOW);
  44        ixp4xx_pci_preinit();
  45}
  46
  47static int __init avila_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
  48{
  49        static int pci_irq_table[IRQ_LINES] = {
  50                IXP4XX_GPIO_IRQ(INTA),
  51                IXP4XX_GPIO_IRQ(INTB),
  52                IXP4XX_GPIO_IRQ(INTC),
  53                IXP4XX_GPIO_IRQ(INTD)
  54        };
  55
  56        if (slot >= 1 &&
  57            slot <= (machine_is_loft() ? LOFT_MAX_DEV : AVILA_MAX_DEV) &&
  58            pin >= 1 && pin <= IRQ_LINES)
  59                return pci_irq_table[(slot + pin - 2) % 4];
  60
  61        return -1;
  62}
  63
  64struct hw_pci avila_pci __initdata = {
  65        .nr_controllers = 1,
  66        .ops            = &ixp4xx_ops,
  67        .preinit        = avila_pci_preinit,
  68        .setup          = ixp4xx_setup,
  69        .map_irq        = avila_map_irq,
  70};
  71
  72int __init avila_pci_init(void)
  73{
  74        if (machine_is_avila() || machine_is_loft())
  75                pci_common_init(&avila_pci);
  76        return 0;
  77}
  78
  79subsys_initcall(avila_pci_init);
  80