kernel/linux/arch/arm/mach-ixp4xx/prpmc1100-pci.c

   1 /*
   2  * arch/arm/mach-ixp4xx/prpmc1100-pci.c
   3  *
   4  * PrPMC1100 PCI initialization
   5  *
   6  * Copyright (C) 2003-2004 MontaVista Sofwtare, Inc.
   7  * Based on IXDP425 code originally (C) Intel Corporation
   8  *
   9  * Author: Deepak Saxena <dsaxena@plexity.net>
  10  *
  11  * PrPMC1100 PCI init code.  GPIO usage is similar to that on
  12  * IXDP425, but the IRQ routing is completely different and
  13  * depends on what carrier you are using. This code is written
  14  * to work on the Motorola PrPMC800 ATX carrier board.
  15  *
  16  * This program is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License version 2 as
  18  * published by the Free Software Foundation.
  19  *
  20  */
  21
  22 #include <linux/config.h>
  23 #include <linux/pci.h>
  24 #include <linux/init.h>
  25
  26 #include <asm/mach-types.h>
  27 #include <asm/irq.h>
  28 #include <asm/hardware.h>
  29
  30 #include <asm/mach/pci.h>
  31
  32
  33 void __init prpmc1100_pci_preinit(void)
  34 {
  35         gpio_line_config(PRPMC1100_PCI_INTA_PIN,
  36                                 IXP4XX_GPIO_IN | IXP4XX_GPIO_ACTIVE_LOW);
  37         gpio_line_config(PRPMC1100_PCI_INTB_PIN,
  38                                 IXP4XX_GPIO_IN | IXP4XX_GPIO_ACTIVE_LOW);
  39         gpio_line_config(PRPMC1100_PCI_INTC_PIN,
  40                                 IXP4XX_GPIO_IN | IXP4XX_GPIO_ACTIVE_LOW);
  41         gpio_line_config(PRPMC1100_PCI_INTD_PIN,
  42                                 IXP4XX_GPIO_IN | IXP4XX_GPIO_ACTIVE_LOW);
  43
  44         gpio_line_isr_clear(PRPMC1100_PCI_INTA_PIN);
  45         gpio_line_isr_clear(PRPMC1100_PCI_INTB_PIN);
  46         gpio_line_isr_clear(PRPMC1100_PCI_INTC_PIN);
  47         gpio_line_isr_clear(PRPMC1100_PCI_INTD_PIN);
  48
  49         ixp4xx_pci_preinit();
  50 }
  51
  52
  53 static int __init prpmc1100_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
  54 {
  55         int irq = -1;
  56
  57         static int pci_irq_table[][4] = {
  58                 {       /* IDSEL 16 - PMC A1 */
  59                         IRQ_PRPMC1100_PCI_INTD,
  60                         IRQ_PRPMC1100_PCI_INTA,
  61                         IRQ_PRPMC1100_PCI_INTB,
  62                         IRQ_PRPMC1100_PCI_INTC
  63                 }, {    /* IDSEL 17 - PRPMC-A-B */
  64                         IRQ_PRPMC1100_PCI_INTD,
  65                         IRQ_PRPMC1100_PCI_INTA,
  66                         IRQ_PRPMC1100_PCI_INTB,
  67                         IRQ_PRPMC1100_PCI_INTC
  68                 }, {    /* IDSEL 18 - PMC A1-B */
  69                         IRQ_PRPMC1100_PCI_INTA,
  70                         IRQ_PRPMC1100_PCI_INTB,
  71                         IRQ_PRPMC1100_PCI_INTC,
  72                         IRQ_PRPMC1100_PCI_INTD
  73                 }, {    /* IDSEL 19 - Unused */
  74                         0, 0, 0, 0
  75                 }, {    /* IDSEL 20 - P2P Bridge */
  76                         IRQ_PRPMC1100_PCI_INTA,
  77                         IRQ_PRPMC1100_PCI_INTB,
  78                         IRQ_PRPMC1100_PCI_INTC,
  79                         IRQ_PRPMC1100_PCI_INTD
  80                 }, {    /* IDSEL 21 - PMC A2 */
  81                         IRQ_PRPMC1100_PCI_INTC,
  82                         IRQ_PRPMC1100_PCI_INTD,
  83                         IRQ_PRPMC1100_PCI_INTA,
  84                         IRQ_PRPMC1100_PCI_INTB
  85                 }, {    /* IDSEL 22 - PMC A2-B */
  86                         IRQ_PRPMC1100_PCI_INTD,
  87                         IRQ_PRPMC1100_PCI_INTA,
  88                         IRQ_PRPMC1100_PCI_INTB,
  89                         IRQ_PRPMC1100_PCI_INTC
  90                 },
  91         };
  92
  93         if (slot >= PRPMC1100_PCI_MIN_DEVID && slot <= PRPMC1100_PCI_MAX_DEVID
  94                 && pin >= 1 && pin <= PRPMC1100_PCI_IRQ_LINES) {
  95                 irq = pci_irq_table[slot - PRPMC1100_PCI_MIN_DEVID][pin - 1];
  96         }
  97
  98         return irq;
  99 }
 100
 101
 102 struct hw_pci prpmc1100_pci __initdata = {
 103         .nr_controllers = 1,
 104         .preinit =        prpmc1100_pci_preinit,
 105         .swizzle =        pci_std_swizzle,
 106         .setup =          ixp4xx_setup,
 107         .scan =           ixp4xx_scan_bus,
 108         .map_irq =        prpmc1100_map_irq,
 109 };
 110
 111 int __init prpmc1100_pci_init(void)
 112 {
 113         if (machine_is_prpmc1100())
 114                 pci_common_init(&prpmc1100_pci);
 115         return 0;
 116 }
 117
 118 subsys_initcall(prpmc1100_pci_init);
 119