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
  38 void __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
  47 static 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
  64 struct 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
  72 int __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
  79 subsys_initcall(avila_pci_init);