arch/mips/ath79/pci.c

   1 /*
   2  *  Atheros AR71XX/AR724X specific PCI setup code
   3  *
   4  *  Copyright (C) 2011 René Bolldorf <xsecute@googlemail.com>
   5  *  Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
   6  *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
   7  *
   8  *  Parts of this file are based on Atheros' 2.6.15 BSP
   9  *
  10  *  This program is free software; you can redistribute it and/or modify it
  11  *  under the terms of the GNU General Public License version 2 as published
  12  *  by the Free Software Foundation.
  13  */
  14
  15 #include <linux/init.h>
  16 #include <linux/pci.h>
  17 #include <asm/mach-ath79/ar71xx_regs.h>
  18 #include <asm/mach-ath79/ath79.h>
  19 #include <asm/mach-ath79/irq.h>
  20 #include <asm/mach-ath79/pci.h>
  21 #include "pci.h"
  22
  23 static int (*ath79_pci_plat_dev_init)(struct pci_dev *dev);
  24 static const struct ath79_pci_irq *ath79_pci_irq_map __initdata;
  25 static unsigned ath79_pci_nr_irqs __initdata;
  26
  27 static const struct ath79_pci_irq ar71xx_pci_irq_map[] __initconst = {
  28         {
  29                 .slot   = 17,
  30                 .pin    = 1,
  31                 .irq    = ATH79_PCI_IRQ(0),
  32         }, {
  33                 .slot   = 18,
  34                 .pin    = 1,
  35                 .irq    = ATH79_PCI_IRQ(1),
  36         }, {
  37                 .slot   = 19,
  38                 .pin    = 1,
  39                 .irq    = ATH79_PCI_IRQ(2),
  40         }
  41 };
  42
  43 static const struct ath79_pci_irq ar724x_pci_irq_map[] __initconst = {
  44         {
  45                 .slot   = 0,
  46                 .pin    = 1,
  47                 .irq    = ATH79_PCI_IRQ(0),
  48         }
  49 };
  50
  51 int __init pcibios_map_irq(const struct pci_dev *dev, uint8_t slot, uint8_t pin)
  52 {
  53         int irq = -1;
  54         int i;
  55
  56         if (ath79_pci_nr_irqs == 0 ||
  57             ath79_pci_irq_map == NULL) {
  58                 if (soc_is_ar71xx()) {
  59                         ath79_pci_irq_map = ar71xx_pci_irq_map;
  60                         ath79_pci_nr_irqs = ARRAY_SIZE(ar71xx_pci_irq_map);
  61                 } else if (soc_is_ar724x() ||
  62                            soc_is_ar9342() ||
  63                            soc_is_ar9344()) {
  64                         ath79_pci_irq_map = ar724x_pci_irq_map;
  65                         ath79_pci_nr_irqs = ARRAY_SIZE(ar724x_pci_irq_map);
  66                 } else {
  67                         pr_crit("pci %s: invalid irq map\n",
  68                                 pci_name((struct pci_dev *) dev));
  69                         return irq;
  70                 }
  71         }
  72
  73         for (i = 0; i < ath79_pci_nr_irqs; i++) {
  74                 const struct ath79_pci_irq *entry;
  75
  76                 entry = &ath79_pci_irq_map[i];
  77                 if (entry->slot == slot && entry->pin == pin) {
  78                         irq = entry->irq;
  79                         break;
  80                 }
  81         }
  82
  83         if (irq < 0)
  84                 pr_crit("pci %s: no irq found for pin %u\n",
  85                         pci_name((struct pci_dev *) dev), pin);
  86         else
  87                 pr_info("pci %s: using irq %d for pin %u\n",
  88                         pci_name((struct pci_dev *) dev), irq, pin);
  89
  90         return irq;
  91 }
  92
  93 int pcibios_plat_dev_init(struct pci_dev *dev)
  94 {
  95         if (ath79_pci_plat_dev_init)
  96                 return ath79_pci_plat_dev_init(dev);
  97
  98         return 0;
  99 }
 100
 101 void __init ath79_pci_set_irq_map(unsigned nr_irqs,
 102                                   const struct ath79_pci_irq *map)
 103 {
 104         ath79_pci_nr_irqs = nr_irqs;
 105         ath79_pci_irq_map = map;
 106 }
 107
 108 void __init ath79_pci_set_plat_dev_init(int (*func)(struct pci_dev *dev))
 109 {
 110         ath79_pci_plat_dev_init = func;
 111 }
 112
 113 int __init ath79_register_pci(void)
 114 {
 115         if (soc_is_ar71xx())
 116                 return ar71xx_pcibios_init();
 117
 118         if (soc_is_ar724x())
 119                 return ar724x_pcibios_init(ATH79_CPU_IRQ_IP2);
 120
 121         if (soc_is_ar9342() || soc_is_ar9344()) {
 122                 u32 bootstrap;
 123
 124                 bootstrap = ath79_reset_rr(AR934X_RESET_REG_BOOTSTRAP);
 125                 if (bootstrap & AR934X_BOOTSTRAP_PCIE_RC)
 126                         return ar724x_pcibios_init(ATH79_IP2_IRQ(0));
 127         }
 128
 129         return -ENODEV;
 130 }