142 lines
3.5 KiB
C
142 lines
3.5 KiB
C
/* pci.c - Generic PCI interfaces. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2007,2009 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/dl.h>
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#include <grub/pci.h>
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#include <grub/mm.h>
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#include <grub/misc.h>
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#include <grub/mm_private.h>
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#include <grub/cache.h>
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GRUB_MOD_LICENSE ("GPLv3+");
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/* FIXME: correctly support 64-bit architectures. */
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/* #if GRUB_TARGET_SIZEOF_VOID_P == 4 */
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struct grub_pci_dma_chunk *
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grub_memalign_dma32 (grub_size_t align, grub_size_t size)
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{
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void *ret;
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if (align < 64)
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align = 64;
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size = ALIGN_UP (size, align);
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ret = grub_memalign (align, size);
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if (!ret)
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return 0;
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grub_arch_sync_dma_caches (ret, size);
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return ret;
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}
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/* FIXME: evil. */
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void
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grub_dma_free (struct grub_pci_dma_chunk *ch)
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{
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grub_size_t size = (((struct grub_mm_header *) ch) - 1)->size * GRUB_MM_ALIGN;
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grub_arch_sync_dma_caches (ch, size);
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grub_free (ch);
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}
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/* #endif */
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#ifdef GRUB_MACHINE_MIPS_LOONGSON
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volatile void *
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grub_dma_get_virt (struct grub_pci_dma_chunk *ch)
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{
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return (void *) ((((grub_uint32_t) ch) & 0x1fffffff) | 0xa0000000);
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}
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grub_uint32_t
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grub_dma_get_phys (struct grub_pci_dma_chunk *ch)
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{
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return (((grub_uint32_t) ch) & 0x1fffffff) | 0x80000000;
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}
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#else
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volatile void *
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grub_dma_get_virt (struct grub_pci_dma_chunk *ch)
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{
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return (void *) ch;
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}
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grub_uint32_t
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grub_dma_get_phys (struct grub_pci_dma_chunk *ch)
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{
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return (grub_uint32_t) (grub_addr_t) ch;
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}
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#endif
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grub_pci_address_t
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grub_pci_make_address (grub_pci_device_t dev, int reg)
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{
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return (1 << 31) | (dev.bus << 16) | (dev.device << 11)
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| (dev.function << 8) | reg;
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}
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void
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grub_pci_iterate (grub_pci_iteratefunc_t hook)
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{
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grub_pci_device_t dev;
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grub_pci_address_t addr;
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grub_pci_id_t id;
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grub_uint32_t hdr;
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for (dev.bus = 0; dev.bus < GRUB_PCI_NUM_BUS; dev.bus++)
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{
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for (dev.device = 0; dev.device < GRUB_PCI_NUM_DEVICES; dev.device++)
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{
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for (dev.function = 0; dev.function < 8; dev.function++)
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{
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addr = grub_pci_make_address (dev, GRUB_PCI_REG_PCI_ID);
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id = grub_pci_read (addr);
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/* Check if there is a device present. */
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if (id >> 16 == 0xFFFF)
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{
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if (dev.function == 0)
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/* Devices are required to implement function 0, so if
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it's missing then there is no device here. */
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break;
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else
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continue;
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}
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#ifdef GRUB_MACHINE_MIPS_LOONGSON
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/* Skip ghosts. */
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if (id == GRUB_LOONGSON_OHCI_PCIID
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&& dev.function == GRUB_LOONGSON_OHCI_GHOST_FUNCTION)
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continue;
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if (id == GRUB_LOONGSON_EHCI_PCIID
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&& dev.function == GRUB_LOONGSON_EHCI_GHOST_FUNCTION)
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continue;
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#endif
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if (hook (dev, id))
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return;
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/* Probe only func = 0 if the device if not multifunction */
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if (dev.function == 0)
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{
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addr = grub_pci_make_address (dev, GRUB_PCI_REG_CACHELINE);
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hdr = grub_pci_read (addr);
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if (!(hdr & 0x800000))
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break;
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}
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}
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}
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}
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}
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