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/eeh.h>
  29 #include <asm/pci-bridge.h>
  30 #include <asm/prom.h>
  31 #include <asm/ppc-pci.h>
  32
  33 #if 0
  34 void pcibios_name_device(struct pci_dev *dev)
  35 {
  36         struct device_node *dn;
  37
  38         /*
  39          * Add IBM loc code (slot) as a prefix to the device names for service
  40          */
  41         dn = pci_device_to_OF_node(dev);
  42         if (dn) {
  43                 const char *loc_code = of_get_property(dn, "ibm,loc-code",
  44                                 NULL);
  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 __init pSeries_request_regions(void)
  61 {
  62         if (!isa_io_base)
  63                 return;
  64
  65         request_region(0x20,0x20,"pic1");
  66         request_region(0xa0,0x20,"pic2");
  67         request_region(0x00,0x20,"dma1");
  68         request_region(0x40,0x20,"timer");
  69         request_region(0x80,0x10,"dma page reg");
  70         request_region(0xc0,0x20,"dma2");
  71 }
  72
  73 void __init pSeries_final_fixup(void)
  74 {
  75         pSeries_request_regions();
  76
  77         eeh_addr_cache_build();
  78 }
  79
  80 /*
  81  * Assume the winbond 82c105 is the IDE controller on a
  82  * p610/p615/p630. We should probably be more careful in case
  83  * someone tries to plug in a similar adapter.
  84  */
  85 static void fixup_winbond_82c105(struct pci_dev* dev)
  86 {
  87         int i;
  88         unsigned int reg;
  89
  90         if (!machine_is(pseries))
  91                 return;
  92
  93         printk("Using INTC for W82c105 IDE controller.\n");
  94         pci_read_config_dword(dev, 0x40, &reg);
  95         /* Enable LEGIRQ to use INTC instead of ISA interrupts */
  96         pci_write_config_dword(dev, 0x40, reg | (1<<11));
  97
  98         for (i = 0; i < DEVICE_COUNT_RESOURCE; ++i) {
  99                 /* zap the 2nd function of the winbond chip */
 100                 if (dev->resource[i].flags & IORESOURCE_IO
 101                     && dev->bus->number == 0 && dev->devfn == 0x81)
 102                         dev->resource[i].flags &= ~IORESOURCE_IO;
 103                 if (dev->resource[i].start == 0 && dev->resource[i].end) {
 104                         dev->resource[i].flags = 0;
 105                         dev->resource[i].end = 0;
 106                 }
 107         }
 108 }
 109 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_WINBOND, PCI_DEVICE_ID_WINBOND_82C105,
 110                          fixup_winbond_82c105);
 111
 112 int pseries_root_bridge_prepare(struct pci_host_bridge *bridge)
 113 {
 114         struct device_node *dn, *pdn;
 115         struct pci_bus *bus;
 116         const __be32 *pcie_link_speed_stats;
 117
 118         bus = bridge->bus;
 119
 120         dn = pcibios_get_phb_of_node(bus);
 121         if (!dn)
 122                 return 0;
 123
 124         for (pdn = dn; pdn != NULL; pdn = of_get_next_parent(pdn)) {
 125                 pcie_link_speed_stats = of_get_property(pdn,
 126                         "ibm,pcie-link-speed-stats", NULL);
 127                 if (pcie_link_speed_stats)
 128                         break;
 129         }
 130
 131         of_node_put(pdn);
 132
 133         if (!pcie_link_speed_stats) {
 134                 pr_err("no ibm,pcie-link-speed-stats property\n");
 135                 return 0;
 136         }
 137
 138         switch (be32_to_cpup(pcie_link_speed_stats)) {
 139         case 0x01:
 140                 bus->max_bus_speed = PCIE_SPEED_2_5GT;
 141                 break;
 142         case 0x02:
 143                 bus->max_bus_speed = PCIE_SPEED_5_0GT;
 144                 break;
 145         default:
 146                 bus->max_bus_speed = PCI_SPEED_UNKNOWN;
 147                 break;
 148         }
 149
 150         switch (be32_to_cpup(pcie_link_speed_stats)) {
 151         case 0x01:
 152                 bus->cur_bus_speed = PCIE_SPEED_2_5GT;
 153                 break;
 154         case 0x02:
 155                 bus->cur_bus_speed = PCIE_SPEED_5_0GT;
 156                 break;
 157         default:
 158                 bus->cur_bus_speed = PCI_SPEED_UNKNOWN;
 159                 break;
 160         }
 161
 162         return 0;
 163 }