arch/mips/pci/pci-ip32.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 2000, 2001 Keith M Wesolowski
   7  * Copyright (C) 2004 by Ralf Baechle (ralf@linux-mips.org)
   8  */
   9 #include <linux/kernel.h>
  10 #include <linux/init.h>
  11 #include <linux/interrupt.h>
  12 #include <linux/pci.h>
  13 #include <linux/types.h>
  14 #include <asm/ip32/mace.h>
  15 #include <asm/ip32/ip32_ints.h>
  16
  17 #undef DEBUG_MACE_PCI
  18
  19 /*
  20  * Handle errors from the bridge.  This includes master and target aborts,
  21  * various command and address errors, and the interrupt test.  This gets
  22  * registered on the bridge error irq.  It's conceivable that some of these
  23  * conditions warrant a panic.  Anybody care to say which ones?
  24  */
  25 static irqreturn_t macepci_error(int irq, void *dev, struct pt_regs *regs)
  26 {
  27         char s;
  28         unsigned int flags = mace->pci.error;
  29         unsigned int addr = mace->pci.error_addr;
  30
  31         if (flags & MACEPCI_ERROR_MEMORY_ADDR)
  32                 s = 'M';
  33         else if (flags & MACEPCI_ERROR_CONFIG_ADDR)
  34                 s = 'C';
  35         else
  36                 s = 'X';
  37
  38         if (flags & MACEPCI_ERROR_MASTER_ABORT) {
  39                 printk("MACEPCI: Master abort at 0x%08x (%c)\n", addr, s);
  40                 flags &= ~MACEPCI_ERROR_MASTER_ABORT;
  41         }
  42         if (flags & MACEPCI_ERROR_TARGET_ABORT) {
  43                 printk("MACEPCI: Target abort at 0x%08x (%c)\n", addr, s);
  44                 flags &= ~MACEPCI_ERROR_TARGET_ABORT;
  45         }
  46         if (flags & MACEPCI_ERROR_DATA_PARITY_ERR) {
  47                 printk("MACEPCI: Data parity error at 0x%08x (%c)\n", addr, s);
  48                 flags &= ~MACEPCI_ERROR_DATA_PARITY_ERR;
  49         }
  50         if (flags & MACEPCI_ERROR_RETRY_ERR) {
  51                 printk("MACEPCI: Retry error at 0x%08x (%c)\n", addr, s);
  52                 flags &= ~MACEPCI_ERROR_RETRY_ERR;
  53         }
  54         if (flags & MACEPCI_ERROR_ILLEGAL_CMD) {
  55                 printk("MACEPCI: Illegal command at 0x%08x (%c)\n", addr, s);
  56                 flags &= ~MACEPCI_ERROR_ILLEGAL_CMD;
  57         }
  58         if (flags & MACEPCI_ERROR_SYSTEM_ERR) {
  59                 printk("MACEPCI: System error at 0x%08x (%c)\n", addr, s);
  60                 flags &= ~MACEPCI_ERROR_SYSTEM_ERR;
  61         }
  62         if (flags & MACEPCI_ERROR_PARITY_ERR) {
  63                 printk("MACEPCI: Parity error at 0x%08x (%c)\n", addr, s);
  64                 flags &= ~MACEPCI_ERROR_PARITY_ERR;
  65         }
  66         if (flags & MACEPCI_ERROR_OVERRUN) {
  67                 printk("MACEPCI: Overrun error at 0x%08x (%c)\n", addr, s);
  68                 flags &= ~MACEPCI_ERROR_OVERRUN;
  69         }
  70         if (flags & MACEPCI_ERROR_SIG_TABORT) {
  71                 printk("MACEPCI: Signaled target abort (clearing)\n");
  72                 flags &= ~MACEPCI_ERROR_SIG_TABORT;
  73         }
  74         if (flags & MACEPCI_ERROR_INTERRUPT_TEST) {
  75                 printk("MACEPCI: Interrupt test triggered (clearing)\n");
  76                 flags &= ~MACEPCI_ERROR_INTERRUPT_TEST;
  77         }
  78
  79         mace->pci.error = flags;
  80
  81         return IRQ_HANDLED;
  82 }
  83
  84
  85 extern struct pci_ops mace_pci_ops;
  86 #ifdef CONFIG_64BIT
  87 static struct resource mace_pci_mem_resource = {
  88         .name   = "SGI O2 PCI MEM",
  89         .start  = MACEPCI_HI_MEMORY,
  90         .end    = 0x2FFFFFFFFUL,
  91         .flags  = IORESOURCE_MEM,
  92 };
  93 static struct resource mace_pci_io_resource = {
  94         .name   = "SGI O2 PCI IO",
  95         .start  = 0x00000000UL,
  96         .end    = 0xffffffffUL,
  97         .flags  = IORESOURCE_IO,
  98 };
  99 #define MACE_PCI_MEM_OFFSET 0x200000000
 100 #else
 101 static struct resource mace_pci_mem_resource = {
 102         .name   = "SGI O2 PCI MEM",
 103         .start  = MACEPCI_LOW_MEMORY,
 104         .end    = MACEPCI_LOW_MEMORY + 0x2000000 - 1,
 105         .flags  = IORESOURCE_MEM,
 106 };
 107 static struct resource mace_pci_io_resource = {
 108         .name   = "SGI O2 PCI IO",
 109         .start  = 0x00000000,
 110         .end    = 0xFFFFFFFF,
 111         .flags  = IORESOURCE_IO,
 112 };
 113 #define MACE_PCI_MEM_OFFSET (MACEPCI_LOW_MEMORY - 0x80000000)
 114 #endif
 115 static struct pci_controller mace_pci_controller = {
 116         .pci_ops        = &mace_pci_ops,
 117         .mem_resource   = &mace_pci_mem_resource,
 118         .io_resource    = &mace_pci_io_resource,
 119         .iommu          = 0,
 120         .mem_offset     = MACE_PCI_MEM_OFFSET,
 121         .io_offset      = 0,
 122 };
 123
 124 static int __init mace_init(void)
 125 {
 126         PCIBIOS_MIN_IO = 0x1000;
 127
 128         /* Clear any outstanding errors and enable interrupts */
 129         mace->pci.error_addr = 0;
 130         mace->pci.error = 0;
 131         mace->pci.control = 0xff008500;
 132
 133         printk("MACE PCI rev %d\n", mace->pci.rev);
 134
 135         BUG_ON(request_irq(MACE_PCI_BRIDGE_IRQ, macepci_error, 0,
 136                            "MACE PCI error", NULL));
 137
 138         iomem_resource = mace_pci_mem_resource;
 139         ioport_resource = mace_pci_io_resource;
 140
 141         register_pci_controller(&mace_pci_controller);
 142
 143         return 0;
 144 }
 145
 146 arch_initcall(mace_init);