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/*
* pci_host.c
*
* Copyright (c) 2009 Isaku Yamahata <yamahata at valinux co jp>
* VA Linux Systems Japan K.K.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License along
* with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "pci.h"
#include "pci_host.h"
/* debug PCI */
//#define DEBUG_PCI
#ifdef DEBUG_PCI
#define PCI_DPRINTF(fmt, ...) \
do { printf("pci_host_data: " fmt , ## __VA_ARGS__); } while (0)
#else
#define PCI_DPRINTF(fmt, ...)
#endif
/*
* PCI address
* bit 16 - 24: bus number
* bit 8 - 15: devfun number
* bit 0 - 7: offset in configuration space of a given pci device
*/
/* the helper functio to get a PCIDeice* for a given pci address */
static inline PCIDevice *pci_dev_find_by_addr(PCIBus *bus, uint32_t addr)
{
uint8_t bus_num = addr >> 16;
uint8_t devfn = addr >> 8;
return pci_find_device(bus, bus_num, devfn);
}
void pci_host_config_write_common(PCIDevice *pci_dev, uint32_t addr,
uint32_t limit, uint32_t val, uint32_t len)
{
assert(len <= 4);
pci_dev->config_write(pci_dev, addr, val, MIN(len, limit - addr));
}
uint32_t pci_host_config_read_common(PCIDevice *pci_dev, uint32_t addr,
uint32_t limit, uint32_t len)
{
assert(len <= 4);
return pci_dev->config_read(pci_dev, addr, MIN(len, limit - addr));
}
void pci_data_write(PCIBus *s, uint32_t addr, uint32_t val, int len)
{
PCIDevice *pci_dev = pci_dev_find_by_addr(s, addr);
uint32_t config_addr = addr & (PCI_CONFIG_SPACE_SIZE - 1);
if (!pci_dev) {
return;
}
PCI_DPRINTF("%s: %s: addr=%02" PRIx32 " val=%08" PRIx32 " len=%d\n",
__func__, pci_dev->name, config_addr, val, len);
pci_host_config_write_common(pci_dev, config_addr, PCI_CONFIG_SPACE_SIZE,
val, len);
}
uint32_t pci_data_read(PCIBus *s, uint32_t addr, int len)
{
PCIDevice *pci_dev = pci_dev_find_by_addr(s, addr);
uint32_t config_addr = addr & (PCI_CONFIG_SPACE_SIZE - 1);
uint32_t val;
if (!pci_dev) {
return ~0x0;
}
val = pci_host_config_read_common(pci_dev, config_addr,
PCI_CONFIG_SPACE_SIZE, len);
PCI_DPRINTF("%s: %s: addr=%02"PRIx32" val=%08"PRIx32" len=%d\n",
__func__, pci_dev->name, config_addr, val, len);
return val;
}
static void pci_host_config_write(ReadWriteHandler *handler,
pcibus_t addr, uint32_t val, int len)
{
PCIHostState *s = container_of(handler, PCIHostState, conf_handler);
PCI_DPRINTF("%s addr %" FMT_PCIBUS " %d val %"PRIx32"\n",
__func__, addr, len, val);
s->config_reg = val;
}
static uint32_t pci_host_config_read(ReadWriteHandler *handler,
pcibus_t addr, int len)
{
PCIHostState *s = container_of(handler, PCIHostState, conf_handler);
uint32_t val = s->config_reg;
PCI_DPRINTF("%s addr %" FMT_PCIBUS " len %d val %"PRIx32"\n",
__func__, addr, len, val);
return val;
}
static void pci_host_data_write(ReadWriteHandler *handler,
pcibus_t addr, uint32_t val, int len)
{
PCIHostState *s = container_of(handler, PCIHostState, data_handler);
PCI_DPRINTF("write addr %" FMT_PCIBUS " len %d val %x\n",
addr, len, val);
if (s->config_reg & (1u << 31))
pci_data_write(s->bus, s->config_reg | (addr & 3), val, len);
}
static uint32_t pci_host_data_read(ReadWriteHandler *handler,
pcibus_t addr, int len)
{
PCIHostState *s = container_of(handler, PCIHostState, data_handler);
uint32_t val;
if (!(s->config_reg & (1 << 31)))
return 0xffffffff;
val = pci_data_read(s->bus, s->config_reg | (addr & 3), len);
PCI_DPRINTF("read addr %" FMT_PCIBUS " len %d val %x\n",
addr, len, val);
return val;
}
static void pci_host_init(PCIHostState *s)
{
s->conf_handler.write = pci_host_config_write;
s->conf_handler.read = pci_host_config_read;
s->data_handler.write = pci_host_data_write;
s->data_handler.read = pci_host_data_read;
}
int pci_host_conf_register_mmio(PCIHostState *s, int endian)
{
pci_host_init(s);
return cpu_register_io_memory_simple(&s->conf_handler, endian);
}
void pci_host_conf_register_ioport(pio_addr_t ioport, PCIHostState *s)
{
pci_host_init(s);
register_ioport_simple(&s->conf_handler, ioport, 4, 4);
sysbus_init_ioports(&s->busdev, ioport, 4);
}
int pci_host_data_register_mmio(PCIHostState *s, int endian)
{
pci_host_init(s);
return cpu_register_io_memory_simple(&s->data_handler, endian);
}
void pci_host_data_register_ioport(pio_addr_t ioport, PCIHostState *s)
{
pci_host_init(s);
register_ioport_simple(&s->data_handler, ioport, 4, 1);
register_ioport_simple(&s->data_handler, ioport, 4, 2);
register_ioport_simple(&s->data_handler, ioport, 4, 4);
sysbus_init_ioports(&s->busdev, ioport, 4);
}
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