hw/pcie_port.c

   1 /*
   2  * pcie_port.c
   3  *
   4  * Copyright (c) 2010 Isaku Yamahata <yamahata at valinux co jp>
   5  *                    VA Linux Systems Japan K.K.
   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 along
  18  * with this program; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include "pcie_port.h"
  22
  23 void pcie_port_init_reg(PCIDevice *d)
  24 {
  25     /* Unlike pci bridge,
  26        66MHz and fast back to back don't apply to pci express port. */
  27     pci_set_word(d->config + PCI_STATUS, 0);
  28     pci_set_word(d->config + PCI_SEC_STATUS, 0);
  29
  30     /* Unlike conventional pci bridge, some bits are hardwired to 0. */
  31     pci_set_word(d->wmask + PCI_BRIDGE_CONTROL,
  32                  PCI_BRIDGE_CTL_PARITY |
  33                  PCI_BRIDGE_CTL_ISA |
  34                  PCI_BRIDGE_CTL_VGA |
  35                  PCI_BRIDGE_CTL_SERR |
  36                  PCI_BRIDGE_CTL_BUS_RESET);
  37 }
  38
  39 /**************************************************************************
  40  * (chassis number, pcie physical slot number) -> pcie slot conversion
  41  */
  42 struct PCIEChassis {
  43     uint8_t     number;
  44
  45     QLIST_HEAD(, PCIESlot) slots;
  46     QLIST_ENTRY(PCIEChassis) next;
  47 };
  48
  49 static QLIST_HEAD(, PCIEChassis) chassis = QLIST_HEAD_INITIALIZER(chassis);
  50
  51 static struct PCIEChassis *pcie_chassis_find(uint8_t chassis_number)
  52 {
  53     struct PCIEChassis *c;
  54     QLIST_FOREACH(c, &chassis, next) {
  55         if (c->number == chassis_number) {
  56             break;
  57         }
  58     }
  59     return c;
  60 }
  61
  62 void pcie_chassis_create(uint8_t chassis_number)
  63 {
  64     struct PCIEChassis *c;
  65     c = pcie_chassis_find(chassis_number);
  66     if (c) {
  67         return;
  68     }
  69     c = g_malloc0(sizeof(*c));
  70     c->number = chassis_number;
  71     QLIST_INIT(&c->slots);
  72     QLIST_INSERT_HEAD(&chassis, c, next);
  73 }
  74
  75 static PCIESlot *pcie_chassis_find_slot_with_chassis(struct PCIEChassis *c,
  76                                                      uint8_t slot)
  77 {
  78     PCIESlot *s;
  79     QLIST_FOREACH(s, &c->slots, next) {
  80         if (s->slot == slot) {
  81             break;
  82         }
  83     }
  84     return s;
  85 }
  86
  87 PCIESlot *pcie_chassis_find_slot(uint8_t chassis_number, uint16_t slot)
  88 {
  89     struct PCIEChassis *c;
  90     c = pcie_chassis_find(chassis_number);
  91     if (!c) {
  92         return NULL;
  93     }
  94     return pcie_chassis_find_slot_with_chassis(c, slot);
  95 }
  96
  97 int pcie_chassis_add_slot(struct PCIESlot *slot)
  98 {
  99     struct PCIEChassis *c;
 100     c = pcie_chassis_find(slot->chassis);
 101     if (!c) {
 102         return -ENODEV;
 103     }
 104     if (pcie_chassis_find_slot_with_chassis(c, slot->slot)) {
 105         return -EBUSY;
 106     }
 107     QLIST_INSERT_HEAD(&c->slots, slot, next);
 108     return 0;
 109 }
 110
 111 void pcie_chassis_del_slot(PCIESlot *s)
 112 {
 113     QLIST_REMOVE(s, next);
 114 }