arch/powerpc/platforms/pseries/pci.c

   1 /*
   2  * Copyright (C) 2001 Dave Engebretsen, IBM Corporation
   3  * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
   4  *
   5  * pSeries specific routines for PCI.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  20  */
  21
  22 #include <linux/init.h>
  23 #include <linux/ioport.h>
  24 #include <linux/kernel.h>
  25 #include <linux/pci.h>
  26 #include <linux/string.h>
  27
  28 #include <asm/pci-bridge.h>
  29 #include <asm/prom.h>
  30 #include <asm/ppc-pci.h>
  31
  32 static int __devinitdata s7a_workaround = -1;
  33
  34 #if 0
  35 void pcibios_name_device(struct pci_dev *dev)
  36 {
  37         struct device_node *dn;
  38
  39         /*
  40          * Add IBM loc code (slot) as a prefix to the device names for service
  41          */
  42         dn = pci_device_to_OF_node(dev);
  43         if (dn) {
  44                 char *loc_code = get_property(dn, "ibm,loc-code", 0);
  45                 if (loc_code) {
  46                         int loc_len = strlen(loc_code);
  47                         if (loc_len < sizeof(dev->dev.name)) {
  48                                 memmove(dev->dev.name+loc_len+1, dev->dev.name,
  49                                         sizeof(dev->dev.name)-loc_len-1);
  50                                 memcpy(dev->dev.name, loc_code, loc_len);
  51                                 dev->dev.name[loc_len] = ' ';
  52                                 dev->dev.name[sizeof(dev->dev.name)-1] = '\0';
  53                         }
  54                 }
  55         }
  56 }
  57 DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pcibios_name_device);
  58 #endif
  59
  60 static void __devinit check_s7a(void)
  61 {
  62         struct device_node *root;
  63         const char *model;
  64
  65         s7a_workaround = 0;
  66         root = of_find_node_by_path("/");
  67         if (root) {
  68                 model = get_property(root, "model", NULL);
  69                 if (model && !strcmp(model, "IBM,7013-S7A"))
  70                         s7a_workaround = 1;
  71                 of_node_put(root);
  72         }
  73 }
  74
  75 void __devinit pSeries_irq_bus_setup(struct pci_bus *bus)
  76 {
  77         struct pci_dev *dev;
  78
  79         if (s7a_workaround < 0)
  80                 check_s7a();
  81         list_for_each_entry(dev, &bus->devices, bus_list) {
  82                 pci_read_irq_line(dev);
  83                 if (s7a_workaround) {
  84                         if (dev->irq > 16) {
  85                                 dev->irq -= 3;
  86                                 pci_write_config_byte(dev, PCI_INTERRUPT_LINE,
  87                                         dev->irq);
  88                         }
  89                 }
  90         }
  91 }
  92
  93 static void __init pSeries_request_regions(void)
  94 {
  95         if (!isa_io_base)
  96                 return;
  97
  98         request_region(0x20,0x20,"pic1");
  99         request_region(0xa0,0x20,"pic2");
 100         request_region(0x00,0x20,"dma1");
 101         request_region(0x40,0x20,"timer");
 102         request_region(0x80,0x10,"dma page reg");
 103         request_region(0xc0,0x20,"dma2");
 104 }
 105
 106 void __init pSeries_final_fixup(void)
 107 {
 108         pSeries_request_regions();
 109
 110         pci_addr_cache_build();
 111 }
 112
 113 /*
 114  * Assume the winbond 82c105 is the IDE controller on a
 115  * p610.  We should probably be more careful in case
 116  * someone tries to plug in a similar adapter.
 117  */
 118 static void fixup_winbond_82c105(struct pci_dev* dev)
 119 {
 120         int i;
 121         unsigned int reg;
 122
 123         if (!machine_is(pseries))
 124                 return;
 125
 126         printk("Using INTC for W82c105 IDE controller.\n");
 127         pci_read_config_dword(dev, 0x40, &reg);
 128         /* Enable LEGIRQ to use INTC instead of ISA interrupts */
 129         pci_write_config_dword(dev, 0x40, reg | (1<<11));
 130
 131         for (i = 0; i < DEVICE_COUNT_RESOURCE; ++i) {
 132                 /* zap the 2nd function of the winbond chip */
 133                 if (dev->resource[i].flags & IORESOURCE_IO
 134                     && dev->bus->number == 0 && dev->devfn == 0x81)
 135                         dev->resource[i].flags &= ~IORESOURCE_IO;
 136         }
 137 }
 138 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_WINBOND, PCI_DEVICE_ID_WINBOND_82C105,
 139                          fixup_winbond_82c105);