hw/pci_host.h

   1 /*
   2  * QEMU Common PCI Host bridge configuration data space access routines.
   3  *
   4  * Copyright (c) 2006 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 /* Worker routines for a PCI host controller that uses an {address,data}
  26    register pair to access PCI configuration space.  */
  27
  28 /* debug PCI */
  29 //#define DEBUG_PCI
  30
  31 #ifdef DEBUG_PCI
  32 #define PCI_DPRINTF(fmt, args...) \
  33 do { printf("pci_host_data: " fmt , ##args); } while (0)
  34 #else
  35 #define PCI_DPRINTF(fmt, args...)
  36 #endif
  37
  38 typedef struct {
  39     uint32_t config_reg;
  40     PCIBus *bus;
  41 } PCIHostState;
  42
  43 static void pci_host_data_writeb(void* opaque, pci_addr_t addr, uint32_t val)
  44 {
  45     PCIHostState *s = opaque;
  46
  47     PCI_DPRINTF("writeb addr " TARGET_FMT_plx " val %x\n",
  48                 (target_phys_addr_t)addr, val);
  49     if (s->config_reg & (1u << 31))
  50         pci_data_write(s->bus, s->config_reg | (addr & 3), val, 1);
  51 }
  52
  53 static void pci_host_data_writew(void* opaque, pci_addr_t addr, uint32_t val)
  54 {
  55     PCIHostState *s = opaque;
  56 #ifdef TARGET_WORDS_BIGENDIAN
  57     val = bswap16(val);
  58 #endif
  59     PCI_DPRINTF("writew addr " TARGET_FMT_plx " val %x\n",
  60                 (target_phys_addr_t)addr, val);
  61     if (s->config_reg & (1u << 31))
  62         pci_data_write(s->bus, s->config_reg | (addr & 3), val, 2);
  63 }
  64
  65 static void pci_host_data_writel(void* opaque, pci_addr_t addr, uint32_t val)
  66 {
  67     PCIHostState *s = opaque;
  68 #ifdef TARGET_WORDS_BIGENDIAN
  69     val = bswap32(val);
  70 #endif
  71     PCI_DPRINTF("writel addr " TARGET_FMT_plx " val %x\n",
  72                 (target_phys_addr_t)addr, val);
  73     if (s->config_reg & (1u << 31))
  74         pci_data_write(s->bus, s->config_reg, val, 4);
  75 }
  76
  77 static uint32_t pci_host_data_readb(void* opaque, pci_addr_t addr)
  78 {
  79     PCIHostState *s = opaque;
  80     uint32_t val;
  81
  82     if (!(s->config_reg & (1 << 31)))
  83         return 0xff;
  84     val = pci_data_read(s->bus, s->config_reg | (addr & 3), 1);
  85     PCI_DPRINTF("readb addr " TARGET_FMT_plx " val %x\n",
  86                 (target_phys_addr_t)addr, val);
  87     return val;
  88 }
  89
  90 static uint32_t pci_host_data_readw(void* opaque, pci_addr_t addr)
  91 {
  92     PCIHostState *s = opaque;
  93     uint32_t val;
  94     if (!(s->config_reg & (1 << 31)))
  95         return 0xffff;
  96     val = pci_data_read(s->bus, s->config_reg | (addr & 3), 2);
  97     PCI_DPRINTF("readw addr " TARGET_FMT_plx " val %x\n",
  98                 (target_phys_addr_t)addr, val);
  99 #ifdef TARGET_WORDS_BIGENDIAN
 100     val = bswap16(val);
 101 #endif
 102     return val;
 103 }
 104
 105 static uint32_t pci_host_data_readl(void* opaque, pci_addr_t addr)
 106 {
 107     PCIHostState *s = opaque;
 108     uint32_t val;
 109     if (!(s->config_reg & (1 << 31)))
 110         return 0xffffffff;
 111     val = pci_data_read(s->bus, s->config_reg | (addr & 3), 4);
 112     PCI_DPRINTF("readl addr " TARGET_FMT_plx " val %x\n",
 113                 (target_phys_addr_t)addr, val);
 114 #ifdef TARGET_WORDS_BIGENDIAN
 115     val = bswap32(val);
 116 #endif
 117     return val;
 118 }