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_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(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     s->config_reg = val;
  89 }
  90
  91 static uint32_t pci_host_config_read(ReadWriteHandler *handler,
  92                                      pcibus_t addr, int len)
  93 {
  94     PCIHostState *s = container_of(handler, PCIHostState, conf_handler);
  95     uint32_t val = s->config_reg;
  96
  97     PCI_DPRINTF("%s addr %" FMT_PCIBUS " len %d val %"PRIx32"\n",
  98                 __func__, addr, len, val);
  99     return val;
 100 }
 101
 102 static void pci_host_data_write(ReadWriteHandler *handler,
 103                                 pcibus_t addr, uint32_t val, int len)
 104 {
 105     PCIHostState *s = container_of(handler, PCIHostState, data_handler);
 106     PCI_DPRINTF("write addr %" FMT_PCIBUS " len %d val %x\n",
 107                 addr, len, val);
 108     if (s->config_reg & (1u << 31))
 109         pci_data_write(s->bus, s->config_reg | (addr & 3), val, len);
 110 }
 111
 112 static uint32_t pci_host_data_read(ReadWriteHandler *handler,
 113                                    pcibus_t addr, int len)
 114 {
 115     PCIHostState *s = container_of(handler, PCIHostState, data_handler);
 116     uint32_t val;
 117     if (!(s->config_reg & (1 << 31)))
 118         return 0xffffffff;
 119     val = pci_data_read(s->bus, s->config_reg | (addr & 3), len);
 120     PCI_DPRINTF("read addr %" FMT_PCIBUS " len %d val %x\n",
 121                 addr, len, val);
 122     return val;
 123 }
 124
 125 static void pci_host_init(PCIHostState *s)
 126 {
 127     s->conf_handler.write = pci_host_config_write;
 128     s->conf_handler.read = pci_host_config_read;
 129     s->data_handler.write = pci_host_data_write;
 130     s->data_handler.read = pci_host_data_read;
 131 }
 132
 133 int pci_host_conf_register_mmio(PCIHostState *s, int endian)
 134 {
 135     pci_host_init(s);
 136     return cpu_register_io_memory_simple(&s->conf_handler, endian);
 137 }
 138
 139 void pci_host_conf_register_ioport(pio_addr_t ioport, PCIHostState *s)
 140 {
 141     pci_host_init(s);
 142     register_ioport_simple(&s->conf_handler, ioport, 4, 4);
 143     sysbus_init_ioports(&s->busdev, ioport, 4);
 144 }
 145
 146 int pci_host_data_register_mmio(PCIHostState *s, int endian)
 147 {
 148     pci_host_init(s);
 149     return cpu_register_io_memory_simple(&s->data_handler, endian);
 150 }
 151
 152 void pci_host_data_register_ioport(pio_addr_t ioport, PCIHostState *s)
 153 {
 154     pci_host_init(s);
 155     register_ioport_simple(&s->data_handler, ioport, 4, 1);
 156     register_ioport_simple(&s->data_handler, ioport, 4, 2);
 157     register_ioport_simple(&s->data_handler, ioport, 4, 4);
 158     sysbus_init_ioports(&s->busdev, ioport, 4);
 159 }