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/* pci.c - Generic PCI interfaces. */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2007,2009 Free Software Foundation, Inc.
*
* GRUB 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 3 of the License, or
* (at your option) any later version.
*
* GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/dl.h>
#include <grub/pci.h>
#include <grub/mm.h>
#include <grub/misc.h>
#include <grub/mm_private.h>
#include <grub/cache.h>
GRUB_MOD_LICENSE ("GPLv3+");
/* FIXME: correctly support 64-bit architectures. */
/* #if GRUB_TARGET_SIZEOF_VOID_P == 4 */
struct grub_pci_dma_chunk *
grub_memalign_dma32 (grub_size_t align, grub_size_t size)
{
void *ret;
if (align < 64)
align = 64;
size = ALIGN_UP (size, align);
ret = grub_memalign (align, size);
#if GRUB_CPU_SIZEOF_VOID_P == 8
if ((grub_addr_t) ret >> 32)
{
/* Shouldn't happend since the only platform in this case is
x86_64-efi and it skips any regions > 4GiB because
of EFI bugs anyway. */
grub_error (GRUB_ERR_BUG, "allocation outside 32-bit range");
return 0;
}
#endif
if (!ret)
return 0;
grub_arch_sync_dma_caches (ret, size);
return ret;
}
/* FIXME: evil. */
void
grub_dma_free (struct grub_pci_dma_chunk *ch)
{
grub_size_t size = (((struct grub_mm_header *) ch) - 1)->size * GRUB_MM_ALIGN;
grub_arch_sync_dma_caches (ch, size);
grub_free (ch);
}
/* #endif */
#ifdef GRUB_MACHINE_MIPS_LOONGSON
volatile void *
grub_dma_get_virt (struct grub_pci_dma_chunk *ch)
{
return (void *) ((((grub_uint32_t) ch) & 0x1fffffff) | 0xa0000000);
}
grub_uint32_t
grub_dma_get_phys (struct grub_pci_dma_chunk *ch)
{
return (((grub_uint32_t) ch) & 0x1fffffff) | 0x80000000;
}
#else
volatile void *
grub_dma_get_virt (struct grub_pci_dma_chunk *ch)
{
return (void *) ch;
}
grub_uint32_t
grub_dma_get_phys (struct grub_pci_dma_chunk *ch)
{
return (grub_uint32_t) (grub_addr_t) ch;
}
#endif
grub_pci_address_t
grub_pci_make_address (grub_pci_device_t dev, int reg)
{
return (1 << 31) | (dev.bus << 16) | (dev.device << 11)
| (dev.function << 8) | reg;
}
void
grub_pci_iterate (grub_pci_iteratefunc_t hook, void *hook_data)
{
grub_pci_device_t dev;
grub_pci_address_t addr;
grub_pci_id_t id;
grub_uint32_t hdr;
for (dev.bus = 0; dev.bus < GRUB_PCI_NUM_BUS; dev.bus++)
{
for (dev.device = 0; dev.device < GRUB_PCI_NUM_DEVICES; dev.device++)
{
for (dev.function = 0; dev.function < 8; dev.function++)
{
addr = grub_pci_make_address (dev, GRUB_PCI_REG_PCI_ID);
id = grub_pci_read (addr);
/* Check if there is a device present. */
if (id >> 16 == 0xFFFF)
{
if (dev.function == 0)
/* Devices are required to implement function 0, so if
it's missing then there is no device here. */
break;
else
continue;
}
if (hook (dev, id, hook_data))
return;
/* Probe only func = 0 if the device if not multifunction */
if (dev.function == 0)
{
addr = grub_pci_make_address (dev, GRUB_PCI_REG_CACHELINE);
hdr = grub_pci_read (addr);
if (!(hdr & 0x800000))
break;
}
}
}
}
}
grub_uint8_t
grub_pci_find_capability (grub_pci_device_t dev, grub_uint8_t cap)
{
grub_uint8_t pos = 0x34;
int ttl = 48;
while (ttl--)
{
grub_uint8_t id;
grub_pci_address_t addr;
addr = grub_pci_make_address (dev, pos);
pos = grub_pci_read_byte (addr);
if (pos < 0x40)
break;
pos &= ~3;
addr = grub_pci_make_address (dev, pos);
id = grub_pci_read_byte (addr);
if (id == 0xff)
break;
if (id == cap)
return pos;
pos++;
}
return 0;
}
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