hw/pci_host.c

   1 /*
   2  * pci_host.c
   3  *
   4  * Copyright (c) 2009 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 "pci.h"
  22 #include "pci_host.h"
  23
  24 /* debug PCI */
  25 //#define DEBUG_PCI
  26
  27 #ifdef DEBUG_PCI
  28 #define PCI_DPRINTF(fmt, ...) \
  29 do { printf("pci_host_data: " fmt , ## __VA_ARGS__); } while (0)
  30 #else
  31 #define PCI_DPRINTF(fmt, ...)
  32 #endif
  33
  34 /*
  35  * PCI address
  36  * bit 16 - 24: bus number
  37  * bit  8 - 15: devfun number
  38  * bit  0 -  7: offset in configuration space of a given pci device
  39  */
  40
  41 /* the helper functio to get a PCIDeice* for a given pci address */
  42 static inline PCIDevice *pci_dev_find_by_addr(PCIBus *bus, uint32_t addr)
  43 {
  44     uint8_t bus_num = addr >> 16;
  45     uint8_t devfn = addr >> 8;
  46
  47     return pci_find_device(bus, bus_num, devfn);
  48 }
  49
  50 void pci_host_config_write_common(PCIDevice *pci_dev, uint32_t addr,
  51                                   uint32_t limit, uint32_t val, uint32_t len)
  52 {
  53     assert(len <= 4);
  54     pci_dev->config_write(pci_dev, addr, val, MIN(len, limit - addr));
  55 }
  56
  57 uint32_t pci_host_config_read_common(PCIDevice *pci_dev, uint32_t addr,
  58                                      uint32_t limit, uint32_t len)
  59 {
  60     assert(len <= 4);
  61     return pci_dev->config_read(pci_dev, addr, MIN(len, limit - addr));
  62 }
  63
  64 void pci_data_write(PCIBus *s, uint32_t addr, uint32_t val, int len)
  65 {
  66     PCIDevice *pci_dev = pci_dev_find_by_addr(s, addr);
  67     uint32_t config_addr = addr & (PCI_CONFIG_SPACE_SIZE - 1);
  68
  69     if (!pci_dev) {
  70         return;
  71     }
  72
  73     PCI_DPRINTF("%s: %s: addr=%02" PRIx32 " val=%08" PRIx32 " len=%d\n",
  74                 __func__, pci_dev->name, config_addr, val, len);
  75     pci_host_config_write_common(pci_dev, config_addr, PCI_CONFIG_SPACE_SIZE,
  76                                  val, len);
  77 }
  78
  79 uint32_t pci_data_read(PCIBus *s, uint32_t addr, int len)
  80 {
  81     PCIDevice *pci_dev = pci_dev_find_by_addr(s, addr);
  82     uint32_t config_addr = addr & (PCI_CONFIG_SPACE_SIZE - 1);
  83     uint32_t val;
  84
  85     if (!pci_dev) {
  86         return ~0x0;
  87     }
  88
  89     val = pci_host_config_read_common(pci_dev, config_addr,
  90                                       PCI_CONFIG_SPACE_SIZE, len);
  91     PCI_DPRINTF("%s: %s: addr=%02"PRIx32" val=%08"PRIx32" len=%d\n",
  92                 __func__, pci_dev->name, config_addr, val, len);
  93
  94     return val;
  95 }
  96
  97 static void pci_host_config_write(void *opaque, hwaddr addr,
  98                                   uint64_t val, unsigned len)
  99 {
 100     PCIHostState *s = opaque;
 101
 102     PCI_DPRINTF("%s addr " TARGET_FMT_plx " len %d val %"PRIx64"\n",
 103                 __func__, addr, len, val);
 104     if (addr != 0 || len != 4) {
 105         return;
 106     }
 107     s->config_reg = val;
 108 }
 109
 110 static uint64_t pci_host_config_read(void *opaque, hwaddr addr,
 111                                      unsigned len)
 112 {
 113     PCIHostState *s = opaque;
 114     uint32_t val = s->config_reg;
 115
 116     PCI_DPRINTF("%s addr " TARGET_FMT_plx " len %d val %"PRIx32"\n",
 117                 __func__, addr, len, val);
 118     return val;
 119 }
 120
 121 static void pci_host_data_write(void *opaque, hwaddr addr,
 122                                 uint64_t val, unsigned len)
 123 {
 124     PCIHostState *s = opaque;
 125     PCI_DPRINTF("write addr " TARGET_FMT_plx " len %d val %x\n",
 126                 addr, len, (unsigned)val);
 127     if (s->config_reg & (1u << 31))
 128         pci_data_write(s->bus, s->config_reg | (addr & 3), val, len);
 129 }
 130
 131 static uint64_t pci_host_data_read(void *opaque,
 132                                    hwaddr addr, unsigned len)
 133 {
 134     PCIHostState *s = opaque;
 135     uint32_t val;
 136     if (!(s->config_reg & (1 << 31)))
 137         return 0xffffffff;
 138     val = pci_data_read(s->bus, s->config_reg | (addr & 3), len);
 139     PCI_DPRINTF("read addr " TARGET_FMT_plx " len %d val %x\n",
 140                 addr, len, val);
 141     return val;
 142 }
 143
 144 const MemoryRegionOps pci_host_conf_le_ops = {
 145     .read = pci_host_config_read,
 146     .write = pci_host_config_write,
 147     .endianness = DEVICE_LITTLE_ENDIAN,
 148 };
 149
 150 const MemoryRegionOps pci_host_conf_be_ops = {
 151     .read = pci_host_config_read,
 152     .write = pci_host_config_write,
 153     .endianness = DEVICE_BIG_ENDIAN,
 154 };
 155
 156 const MemoryRegionOps pci_host_data_le_ops = {
 157     .read = pci_host_data_read,
 158     .write = pci_host_data_write,
 159     .endianness = DEVICE_LITTLE_ENDIAN,
 160 };
 161
 162 const MemoryRegionOps pci_host_data_be_ops = {
 163     .read = pci_host_data_read,
 164     .write = pci_host_data_write,
 165     .endianness = DEVICE_BIG_ENDIAN,
 166 };
 167
 168 static const TypeInfo pci_host_type_info = {
 169     .name = TYPE_PCI_HOST_BRIDGE,
 170     .parent = TYPE_SYS_BUS_DEVICE,
 171     .abstract = true,
 172     .instance_size = sizeof(PCIHostState),
 173 };
 174
 175 static void pci_host_register_types(void)
 176 {
 177     type_register_static(&pci_host_type_info);
 178 }
 179
 180 type_init(pci_host_register_types)