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 <linux/resource.h>
  18 #include <linux/platform_device.h>
  19 #include <asm/mach-ath79/ar71xx_regs.h>
  20 #include <asm/mach-ath79/ath79.h>
  21 #include <asm/mach-ath79/irq.h>
  22 #include "pci.h"
  23
  24 static int (*ath79_pci_plat_dev_init)(struct pci_dev *dev);
  25 static const struct ath79_pci_irq *ath79_pci_irq_map __initdata;
  26 static unsigned ath79_pci_nr_irqs __initdata;
  27
  28 static const struct ath79_pci_irq ar71xx_pci_irq_map[] __initconst = {
  29         {
  30                 .slot   = 17,
  31                 .pin    = 1,
  32                 .irq    = ATH79_PCI_IRQ(0),
  33         }, {
  34                 .slot   = 18,
  35                 .pin    = 1,
  36                 .irq    = ATH79_PCI_IRQ(1),
  37         }, {
  38                 .slot   = 19,
  39                 .pin    = 1,
  40                 .irq    = ATH79_PCI_IRQ(2),
  41         }
  42 };
  43
  44 static const struct ath79_pci_irq ar724x_pci_irq_map[] __initconst = {
  45         {
  46                 .slot   = 0,
  47                 .pin    = 1,
  48                 .irq    = ATH79_PCI_IRQ(0),
  49         }
  50 };
  51
  52 static const struct ath79_pci_irq qca955x_pci_irq_map[] __initconst = {
  53         {
  54                 .bus    = 0,
  55                 .slot   = 0,
  56                 .pin    = 1,
  57                 .irq    = ATH79_PCI_IRQ(0),
  58         },
  59         {
  60                 .bus    = 1,
  61                 .slot   = 0,
  62                 .pin    = 1,
  63                 .irq    = ATH79_PCI_IRQ(1),
  64         },
  65 };
  66
  67 int __init pcibios_map_irq(const struct pci_dev *dev, uint8_t slot, uint8_t pin)
  68 {
  69         int irq = -1;
  70         int i;
  71
  72         if (ath79_pci_nr_irqs == 0 ||
  73             ath79_pci_irq_map == NULL) {
  74                 if (soc_is_ar71xx()) {
  75                         ath79_pci_irq_map = ar71xx_pci_irq_map;
  76                         ath79_pci_nr_irqs = ARRAY_SIZE(ar71xx_pci_irq_map);
  77                 } else if (soc_is_ar724x() ||
  78                            soc_is_ar9342() ||
  79                            soc_is_ar9344()) {
  80                         ath79_pci_irq_map = ar724x_pci_irq_map;
  81                         ath79_pci_nr_irqs = ARRAY_SIZE(ar724x_pci_irq_map);
  82                 } else if (soc_is_qca955x()) {
  83                         ath79_pci_irq_map = qca955x_pci_irq_map;
  84                         ath79_pci_nr_irqs = ARRAY_SIZE(qca955x_pci_irq_map);
  85                 } else {
  86                         pr_crit("pci %s: invalid irq map\n",
  87                                 pci_name((struct pci_dev *) dev));
  88                         return irq;
  89                 }
  90         }
  91
  92         for (i = 0; i < ath79_pci_nr_irqs; i++) {
  93                 const struct ath79_pci_irq *entry;
  94
  95                 entry = &ath79_pci_irq_map[i];
  96                 if (entry->bus == dev->bus->number &&
  97                     entry->slot == slot &&
  98                     entry->pin == pin) {
  99                         irq = entry->irq;
 100                         break;
 101                 }
 102         }
 103
 104         if (irq < 0)
 105                 pr_crit("pci %s: no irq found for pin %u\n",
 106                         pci_name((struct pci_dev *) dev), pin);
 107         else
 108                 pr_info("pci %s: using irq %d for pin %u\n",
 109                         pci_name((struct pci_dev *) dev), irq, pin);
 110
 111         return irq;
 112 }
 113
 114 int pcibios_plat_dev_init(struct pci_dev *dev)
 115 {
 116         if (ath79_pci_plat_dev_init)
 117                 return ath79_pci_plat_dev_init(dev);
 118
 119         return 0;
 120 }
 121
 122 void __init ath79_pci_set_irq_map(unsigned nr_irqs,
 123                                   const struct ath79_pci_irq *map)
 124 {
 125         ath79_pci_nr_irqs = nr_irqs;
 126         ath79_pci_irq_map = map;
 127 }
 128
 129 void __init ath79_pci_set_plat_dev_init(int (*func)(struct pci_dev *dev))
 130 {
 131         ath79_pci_plat_dev_init = func;
 132 }
 133
 134 static struct platform_device *
 135 ath79_register_pci_ar71xx(void)
 136 {
 137         struct platform_device *pdev;
 138         struct resource res[4];
 139
 140         memset(res, 0, sizeof(res));
 141
 142         res[0].name = "cfg_base";
 143         res[0].flags = IORESOURCE_MEM;
 144         res[0].start = AR71XX_PCI_CFG_BASE;
 145         res[0].end = AR71XX_PCI_CFG_BASE + AR71XX_PCI_CFG_SIZE - 1;
 146
 147         res[1].flags = IORESOURCE_IRQ;
 148         res[1].start = ATH79_CPU_IRQ(2);
 149         res[1].end = ATH79_CPU_IRQ(2);
 150
 151         res[2].name = "io_base";
 152         res[2].flags = IORESOURCE_IO;
 153         res[2].start = 0;
 154         res[2].end = 0;
 155
 156         res[3].name = "mem_base";
 157         res[3].flags = IORESOURCE_MEM;
 158         res[3].start = AR71XX_PCI_MEM_BASE;
 159         res[3].end = AR71XX_PCI_MEM_BASE + AR71XX_PCI_MEM_SIZE - 1;
 160
 161         pdev = platform_device_register_simple("ar71xx-pci", -1,
 162                                                res, ARRAY_SIZE(res));
 163         return pdev;
 164 }
 165
 166 static struct platform_device *
 167 ath79_register_pci_ar724x(int id,
 168                           unsigned long cfg_base,
 169                           unsigned long ctrl_base,
 170                           unsigned long crp_base,
 171                           unsigned long mem_base,
 172                           unsigned long mem_size,
 173                           unsigned long io_base,
 174                           int irq)
 175 {
 176         struct platform_device *pdev;
 177         struct resource res[6];
 178
 179         memset(res, 0, sizeof(res));
 180
 181         res[0].name = "cfg_base";
 182         res[0].flags = IORESOURCE_MEM;
 183         res[0].start = cfg_base;
 184         res[0].end = cfg_base + AR724X_PCI_CFG_SIZE - 1;
 185
 186         res[1].name = "ctrl_base";
 187         res[1].flags = IORESOURCE_MEM;
 188         res[1].start = ctrl_base;
 189         res[1].end = ctrl_base + AR724X_PCI_CTRL_SIZE - 1;
 190
 191         res[2].flags = IORESOURCE_IRQ;
 192         res[2].start = irq;
 193         res[2].end = irq;
 194
 195         res[3].name = "mem_base";
 196         res[3].flags = IORESOURCE_MEM;
 197         res[3].start = mem_base;
 198         res[3].end = mem_base + mem_size - 1;
 199
 200         res[4].name = "io_base";
 201         res[4].flags = IORESOURCE_IO;
 202         res[4].start = io_base;
 203         res[4].end = io_base;
 204
 205         res[5].name = "crp_base";
 206         res[5].flags = IORESOURCE_MEM;
 207         res[5].start = crp_base;
 208         res[5].end = crp_base + AR724X_PCI_CRP_SIZE - 1;
 209
 210         pdev = platform_device_register_simple("ar724x-pci", id,
 211                                                res, ARRAY_SIZE(res));
 212         return pdev;
 213 }
 214
 215 int __init ath79_register_pci(void)
 216 {
 217         struct platform_device *pdev = NULL;
 218
 219         if (soc_is_ar71xx()) {
 220                 pdev = ath79_register_pci_ar71xx();
 221         } else if (soc_is_ar724x()) {
 222                 pdev = ath79_register_pci_ar724x(-1,
 223                                                  AR724X_PCI_CFG_BASE,
 224                                                  AR724X_PCI_CTRL_BASE,
 225                                                  AR724X_PCI_CRP_BASE,
 226                                                  AR724X_PCI_MEM_BASE,
 227                                                  AR724X_PCI_MEM_SIZE,
 228                                                  0,
 229                                                  ATH79_CPU_IRQ(2));
 230         } else if (soc_is_ar9342() ||
 231                    soc_is_ar9344()) {
 232                 u32 bootstrap;
 233
 234                 bootstrap = ath79_reset_rr(AR934X_RESET_REG_BOOTSTRAP);
 235                 if ((bootstrap & AR934X_BOOTSTRAP_PCIE_RC) == 0)
 236                         return -ENODEV;
 237
 238                 pdev = ath79_register_pci_ar724x(-1,
 239                                                  AR724X_PCI_CFG_BASE,
 240                                                  AR724X_PCI_CTRL_BASE,
 241                                                  AR724X_PCI_CRP_BASE,
 242                                                  AR724X_PCI_MEM_BASE,
 243                                                  AR724X_PCI_MEM_SIZE,
 244                                                  0,
 245                                                  ATH79_IP2_IRQ(0));
 246         } else if (soc_is_qca9558()) {
 247                 pdev = ath79_register_pci_ar724x(0,
 248                                                  QCA955X_PCI_CFG_BASE0,
 249                                                  QCA955X_PCI_CTRL_BASE0,
 250                                                  QCA955X_PCI_CRP_BASE0,
 251                                                  QCA955X_PCI_MEM_BASE0,
 252                                                  QCA955X_PCI_MEM_SIZE,
 253                                                  0,
 254                                                  ATH79_IP2_IRQ(0));
 255
 256                 pdev = ath79_register_pci_ar724x(1,
 257                                                  QCA955X_PCI_CFG_BASE1,
 258                                                  QCA955X_PCI_CTRL_BASE1,
 259                                                  QCA955X_PCI_CRP_BASE1,
 260                                                  QCA955X_PCI_MEM_BASE1,
 261                                                  QCA955X_PCI_MEM_SIZE,
 262                                                  1,
 263                                                  ATH79_IP3_IRQ(2));
 264         } else {
 265                 /* No PCI support */
 266                 return -ENODEV;
 267         }
 268
 269         if (!pdev)
 270                 pr_err("unable to register PCI controller device\n");
 271
 272         return pdev ? 0 : -ENODEV;
 273 }