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, PCI_SLOT(devfn), PCI_FUNC(devfn));
  48 }
  49
  50 void pci_data_write(PCIBus *s, uint32_t addr, uint32_t val, int len)
  51 {
  52     PCIDevice *pci_dev = pci_dev_find_by_addr(s, addr);
  53     uint32_t config_addr = addr & (PCI_CONFIG_SPACE_SIZE - 1);
  54
  55     if (!pci_dev)
  56         return;
  57
  58     PCI_DPRINTF("%s: %s: addr=%02" PRIx32 " val=%08" PRIx32 " len=%d\n",
  59                 __func__, pci_dev->name, config_addr, val, len);
  60     pci_dev->config_write(pci_dev, config_addr, val, len);
  61 }
  62
  63 uint32_t pci_data_read(PCIBus *s, uint32_t addr, int len)
  64 {
  65     PCIDevice *pci_dev = pci_dev_find_by_addr(s, addr);
  66     uint32_t config_addr = addr & (PCI_CONFIG_SPACE_SIZE - 1);
  67     uint32_t val;
  68
  69     assert(len == 1 || len == 2 || len == 4);
  70     if (!pci_dev) {
  71         return ~0x0;
  72     }
  73
  74     val = pci_dev->config_read(pci_dev, config_addr, len);
  75     PCI_DPRINTF("%s: %s: addr=%02"PRIx32" val=%08"PRIx32" len=%d\n",
  76                 __func__, pci_dev->name, config_addr, val, len);
  77
  78     return val;
  79 }
  80
  81 static void pci_host_config_write_swap(ReadWriteHandler *handler,
  82                                        pcibus_t addr, uint32_t val, int len)
  83 {
  84     PCIHostState *s = container_of(handler, PCIHostState, conf_handler);
  85
  86     PCI_DPRINTF("%s addr %" FMT_PCIBUS " %d val %"PRIx32"\n",
  87                 __func__, addr, len, val);
  88     val = qemu_bswap_len(val, len);
  89     s->config_reg = val;
  90 }
  91
  92 static uint32_t pci_host_config_read_swap(ReadWriteHandler *handler,
  93                                           pcibus_t addr, int len)
  94 {
  95     PCIHostState *s = container_of(handler, PCIHostState, conf_handler);
  96     uint32_t val = s->config_reg;
  97
  98     val = qemu_bswap_len(val, len);
  99     PCI_DPRINTF("%s addr %" FMT_PCIBUS " len %d val %"PRIx32"\n",
 100                 __func__, addr, len, val);
 101     return val;
 102 }
 103
 104 static void pci_host_config_write_noswap(ReadWriteHandler *handler,
 105                                          pcibus_t addr, uint32_t val, int len)
 106 {
 107     PCIHostState *s = container_of(handler, PCIHostState, conf_noswap_handler);
 108
 109     PCI_DPRINTF("%s addr %" FMT_PCIBUS " %d val %"PRIx32"\n",
 110                 __func__, addr, len, val);
 111     s->config_reg = val;
 112 }
 113
 114 static uint32_t pci_host_config_read_noswap(ReadWriteHandler *handler,
 115                                             pcibus_t addr, int len)
 116 {
 117     PCIHostState *s = container_of(handler, PCIHostState, conf_noswap_handler);
 118     uint32_t val = s->config_reg;
 119
 120     PCI_DPRINTF("%s addr %" FMT_PCIBUS " len %d val %"PRIx32"\n",
 121                 __func__, addr, len, val);
 122     return val;
 123 }
 124
 125 static void pci_host_data_write_swap(ReadWriteHandler *handler,
 126                                      pcibus_t addr, uint32_t val, int len)
 127 {
 128     PCIHostState *s = container_of(handler, PCIHostState, data_handler);
 129
 130     val = qemu_bswap_len(val, len);
 131     PCI_DPRINTF("write addr %" FMT_PCIBUS " len %d val %x\n",
 132                 addr, len, val);
 133     if (s->config_reg & (1u << 31))
 134         pci_data_write(s->bus, s->config_reg | (addr & 3), val, len);
 135 }
 136
 137 static uint32_t pci_host_data_read_swap(ReadWriteHandler *handler,
 138                                         pcibus_t addr, int len)
 139 {
 140     PCIHostState *s = container_of(handler, PCIHostState, data_handler);
 141     uint32_t val;
 142     if (!(s->config_reg & (1 << 31)))
 143         return 0xffffffff;
 144     val = pci_data_read(s->bus, s->config_reg | (addr & 3), len);
 145     PCI_DPRINTF("read addr %" FMT_PCIBUS " len %d val %x\n",
 146                 addr, len, val);
 147     val = qemu_bswap_len(val, len);
 148     return val;
 149 }
 150
 151 static void pci_host_data_write_noswap(ReadWriteHandler *handler,
 152                                        pcibus_t addr, uint32_t val, int len)
 153 {
 154     PCIHostState *s = container_of(handler, PCIHostState, data_noswap_handler);
 155     PCI_DPRINTF("write addr %" FMT_PCIBUS " len %d val %x\n",
 156                 addr, len, val);
 157     if (s->config_reg & (1u << 31))
 158         pci_data_write(s->bus, s->config_reg | (addr & 3), val, len);
 159 }
 160
 161 static uint32_t pci_host_data_read_noswap(ReadWriteHandler *handler,
 162                                           pcibus_t addr, int len)
 163 {
 164     PCIHostState *s = container_of(handler, PCIHostState, data_noswap_handler);
 165     uint32_t val;
 166     if (!(s->config_reg & (1 << 31)))
 167         return 0xffffffff;
 168     val = pci_data_read(s->bus, s->config_reg | (addr & 3), len);
 169     PCI_DPRINTF("read addr %" FMT_PCIBUS " len %d val %x\n",
 170                 addr, len, val);
 171     return val;
 172 }
 173
 174 static void pci_host_init(PCIHostState *s)
 175 {
 176     s->conf_handler.write = pci_host_config_write_swap;
 177     s->conf_handler.read = pci_host_config_read_swap;
 178     s->conf_noswap_handler.write = pci_host_config_write_noswap;
 179     s->conf_noswap_handler.read = pci_host_config_read_noswap;
 180     s->data_handler.write = pci_host_data_write_swap;
 181     s->data_handler.read = pci_host_data_read_swap;
 182     s->data_noswap_handler.write = pci_host_data_write_noswap;
 183     s->data_noswap_handler.read = pci_host_data_read_noswap;
 184 }
 185
 186 int pci_host_conf_register_mmio(PCIHostState *s, int swap)
 187 {
 188     pci_host_init(s);
 189     if (swap) {
 190         return cpu_register_io_memory_simple(&s->conf_handler);
 191     } else {
 192         return cpu_register_io_memory_simple(&s->conf_noswap_handler);
 193     }
 194 }
 195
 196 void pci_host_conf_register_ioport(pio_addr_t ioport, PCIHostState *s)
 197 {
 198     pci_host_init(s);
 199     register_ioport_simple(&s->conf_noswap_handler, ioport, 4, 4);
 200 }
 201
 202 int pci_host_data_register_mmio(PCIHostState *s, int swap)
 203 {
 204     pci_host_init(s);
 205     if (swap) {
 206         return cpu_register_io_memory_simple(&s->data_handler);
 207     } else {
 208         return cpu_register_io_memory_simple(&s->data_noswap_handler);
 209     }
 210 }
 211
 212 void pci_host_data_register_ioport(pio_addr_t ioport, PCIHostState *s)
 213 {
 214     pci_host_init(s);
 215     register_ioport_simple(&s->data_noswap_handler, ioport, 4, 1);
 216     register_ioport_simple(&s->data_noswap_handler, ioport, 4, 2);
 217     register_ioport_simple(&s->data_noswap_handler, ioport, 4, 4);
 218 }