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 #include "pseries.h"
  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                 const char *loc_code = of_get_property(dn, "ibm,loc-code",
  45                                 NULL);
  46                 if (loc_code) {
  47                         int loc_len = strlen(loc_code);
  48                         if (loc_len < sizeof(dev->dev.name)) {
  49                                 memmove(dev->dev.name+loc_len+1, dev->dev.name,
  50                                         sizeof(dev->dev.name)-loc_len-1);
  51                                 memcpy(dev->dev.name, loc_code, loc_len);
  52                                 dev->dev.name[loc_len] = ' ';
  53                                 dev->dev.name[sizeof(dev->dev.name)-1] = '\0';
  54                         }
  55                 }
  56         }
  57 }
  58 DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pcibios_name_device);
  59 #endif
  60
  61 static void __init pSeries_request_regions(void)
  62 {
  63         if (!isa_io_base)
  64                 return;
  65
  66         request_region(0x20,0x20,"pic1");
  67         request_region(0xa0,0x20,"pic2");
  68         request_region(0x00,0x20,"dma1");
  69         request_region(0x40,0x20,"timer");
  70         request_region(0x80,0x10,"dma page reg");
  71         request_region(0xc0,0x20,"dma2");
  72 }
  73
  74 void __init pSeries_final_fixup(void)
  75 {
  76         pSeries_request_regions();
  77
  78         eeh_addr_cache_build();
  79 }
  80
  81 /*
  82  * Assume the winbond 82c105 is the IDE controller on a
  83  * p610/p615/p630. We should probably be more careful in case
  84  * someone tries to plug in a similar adapter.
  85  */
  86 static void fixup_winbond_82c105(struct pci_dev* dev)
  87 {
  88         int i;
  89         unsigned int reg;
  90
  91         if (!machine_is(pseries))
  92                 return;
  93
  94         printk("Using INTC for W82c105 IDE controller.\n");
  95         pci_read_config_dword(dev, 0x40, &reg);
  96         /* Enable LEGIRQ to use INTC instead of ISA interrupts */
  97         pci_write_config_dword(dev, 0x40, reg | (1<<11));
  98
  99         for (i = 0; i < DEVICE_COUNT_RESOURCE; ++i) {
 100                 /* zap the 2nd function of the winbond chip */
 101                 if (dev->resource[i].flags & IORESOURCE_IO
 102                     && dev->bus->number == 0 && dev->devfn == 0x81)
 103                         dev->resource[i].flags &= ~IORESOURCE_IO;
 104                 if (dev->resource[i].start == 0 && dev->resource[i].end) {
 105                         dev->resource[i].flags = 0;
 106                         dev->resource[i].end = 0;
 107                 }
 108         }
 109 }
 110 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_WINBOND, PCI_DEVICE_ID_WINBOND_82C105,
 111                          fixup_winbond_82c105);
 112
 113 int pseries_root_bridge_prepare(struct pci_host_bridge *bridge)
 114 {
 115         struct device_node *dn, *pdn;
 116         struct pci_bus *bus;
 117         u32 pcie_link_speed_stats[2];
 118         int rc;
 119
 120         bus = bridge->bus;
 121
 122         dn = pcibios_get_phb_of_node(bus);
 123         if (!dn)
 124                 return 0;
 125
 126         for (pdn = dn; pdn != NULL; pdn = of_get_next_parent(pdn)) {
 127                 rc = of_property_read_u32_array(pdn,
 128                                 "ibm,pcie-link-speed-stats",
 129                                 &pcie_link_speed_stats[0], 2);
 130                 if (!rc)
 131                         break;
 132         }
 133
 134         of_node_put(pdn);
 135
 136         if (rc) {
 137                 pr_debug("no ibm,pcie-link-speed-stats property\n");
 138                 return 0;
 139         }
 140
 141         switch (pcie_link_speed_stats[0]) {
 142         case 0x01:
 143                 bus->max_bus_speed = PCIE_SPEED_2_5GT;
 144                 break;
 145         case 0x02:
 146                 bus->max_bus_speed = PCIE_SPEED_5_0GT;
 147                 break;
 148         case 0x04:
 149                 bus->max_bus_speed = PCIE_SPEED_8_0GT;
 150                 break;
 151         default:
 152                 bus->max_bus_speed = PCI_SPEED_UNKNOWN;
 153                 break;
 154         }
 155
 156         switch (pcie_link_speed_stats[1]) {
 157         case 0x01:
 158                 bus->cur_bus_speed = PCIE_SPEED_2_5GT;
 159                 break;
 160         case 0x02:
 161                 bus->cur_bus_speed = PCIE_SPEED_5_0GT;
 162                 break;
 163         case 0x04:
 164                 bus->cur_bus_speed = PCIE_SPEED_8_0GT;
 165                 break;
 166         default:
 167                 bus->cur_bus_speed = PCI_SPEED_UNKNOWN;
 168                 break;
 169         }
 170
 171         return 0;
 172 }