arch/ppc64/kernel/pSeries_pci.c

   1 /*
   2  * arch/ppc64/kernel/pSeries_pci.c
   3  *
   4  * Copyright (C) 2001 Dave Engebretsen, IBM Corporation
   5  * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
   6  *
   7  * pSeries specific routines for PCI.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  22  */
  23
  24 #include <linux/init.h>
  25 #include <linux/ioport.h>
  26 #include <linux/kernel.h>
  27 #include <linux/pci.h>
  28 #include <linux/string.h>
  29
  30 #include <asm/pci-bridge.h>
  31 #include <asm/prom.h>
  32
  33 #include "pci.h"
  34
  35 static int __initdata s7a_workaround = -1;
  36
  37 #if 0
  38 void pcibios_name_device(struct pci_dev *dev)
  39 {
  40         struct device_node *dn;
  41
  42         /*
  43          * Add IBM loc code (slot) as a prefix to the device names for service
  44          */
  45         dn = pci_device_to_OF_node(dev);
  46         if (dn) {
  47                 char *loc_code = get_property(dn, "ibm,loc-code", 0);
  48                 if (loc_code) {
  49                         int loc_len = strlen(loc_code);
  50                         if (loc_len < sizeof(dev->dev.name)) {
  51                                 memmove(dev->dev.name+loc_len+1, dev->dev.name,
  52                                         sizeof(dev->dev.name)-loc_len-1);
  53                                 memcpy(dev->dev.name, loc_code, loc_len);
  54                                 dev->dev.name[loc_len] = ' ';
  55                                 dev->dev.name[sizeof(dev->dev.name)-1] = '\0';
  56                         }
  57                 }
  58         }
  59 }
  60 DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pcibios_name_device);
  61 #endif
  62
  63 static void __init check_s7a(void)
  64 {
  65         struct device_node *root;
  66         char *model;
  67
  68         s7a_workaround = 0;
  69         root = of_find_node_by_path("/");
  70         if (root) {
  71                 model = get_property(root, "model", NULL);
  72                 if (model && !strcmp(model, "IBM,7013-S7A"))
  73                         s7a_workaround = 1;
  74                 of_node_put(root);
  75         }
  76 }
  77
  78 void __devinit pSeries_irq_bus_setup(struct pci_bus *bus)
  79 {
  80         struct pci_dev *dev;
  81
  82         if (s7a_workaround < 0)
  83                 check_s7a();
  84         list_for_each_entry(dev, &bus->devices, bus_list) {
  85                 pci_read_irq_line(dev);
  86                 if (s7a_workaround) {
  87                         if (dev->irq > 16) {
  88                                 dev->irq -= 3;
  89                                 pci_write_config_byte(dev, PCI_INTERRUPT_LINE,
  90                                         dev->irq);
  91                         }
  92                 }
  93         }
  94 }
  95
  96 static void __init pSeries_request_regions(void)
  97 {
  98         if (!isa_io_base)
  99                 return;
 100
 101         request_region(0x20,0x20,"pic1");
 102         request_region(0xa0,0x20,"pic2");
 103         request_region(0x00,0x20,"dma1");
 104         request_region(0x40,0x20,"timer");
 105         request_region(0x80,0x10,"dma page reg");
 106         request_region(0xc0,0x20,"dma2");
 107 }
 108
 109 void __init pSeries_final_fixup(void)
 110 {
 111         phbs_remap_io();
 112         pSeries_request_regions();
 113
 114         pci_addr_cache_build();
 115 }
 116
 117 /*
 118  * Assume the winbond 82c105 is the IDE controller on a
 119  * p610.  We should probably be more careful in case
 120  * someone tries to plug in a similar adapter.
 121  */
 122 static void fixup_winbond_82c105(struct pci_dev* dev)
 123 {
 124         int i;
 125         unsigned int reg;
 126
 127         if (!(systemcfg->platform & PLATFORM_PSERIES))
 128                 return;
 129
 130         printk("Using INTC for W82c105 IDE controller.\n");
 131         pci_read_config_dword(dev, 0x40, &reg);
 132         /* Enable LEGIRQ to use INTC instead of ISA interrupts */
 133         pci_write_config_dword(dev, 0x40, reg | (1<<11));
 134
 135         for (i = 0; i < DEVICE_COUNT_RESOURCE; ++i) {
 136                 /* zap the 2nd function of the winbond chip */
 137                 if (dev->resource[i].flags & IORESOURCE_IO
 138                     && dev->bus->number == 0 && dev->devfn == 0x81)
 139                         dev->resource[i].flags &= ~IORESOURCE_IO;
 140         }
 141 }
 142 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_WINBOND, PCI_DEVICE_ID_WINBOND_82C105,
 143                          fixup_winbond_82c105);