Some host controllers provide a prefetchable memory area and devices will prefer this for some of their BARs.
Signed-off-by: Lucas Stach <[email protected]> --- drivers/pci/pci.c | 59 ++++++++++++++++++++++++++++++++++++++++------------- include/linux/pci.h | 1 + 2 files changed, 46 insertions(+), 14 deletions(-) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index e9f0cb5..115d8a3 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -13,6 +13,7 @@ LIST_HEAD(pci_root_buses); EXPORT_SYMBOL(pci_root_buses); static u8 bus_index; static resource_size_t last_mem; +static resource_size_t last_mem_pref; static resource_size_t last_io; static struct pci_bus *pci_alloc_bus(void) @@ -42,14 +43,27 @@ void register_pci_controller(struct pci_controller *hose) bus->host = hose; bus->ops = hose->pci_ops; bus->resource[PCI_BUS_RESOURCE_MEM] = hose->mem_resource; + bus->resource[PCI_BUS_RESOURCE_MEM_PREF] = hose->mem_pref_resource; bus->resource[PCI_BUS_RESOURCE_IO] = hose->io_resource; bus->number = bus_index++; if (hose->set_busno) hose->set_busno(hose, bus->number); - last_mem = bus->resource[PCI_BUS_RESOURCE_MEM]->start; - last_io = bus->resource[PCI_BUS_RESOURCE_IO]->start; + if (bus->resource[PCI_BUS_RESOURCE_MEM]) + last_mem = bus->resource[PCI_BUS_RESOURCE_MEM]->start; + else + last_mem = 0; + + if (bus->resource[PCI_BUS_RESOURCE_MEM]) + last_mem_pref = bus->resource[PCI_BUS_RESOURCE_MEM_PREF]->start; + else + last_mem_pref = 0; + + if (bus->resource[PCI_BUS_RESOURCE_IO]) + last_io = bus->resource[PCI_BUS_RESOURCE_IO]->start; + else + last_io = 0; pci_scan_bus(bus); @@ -150,31 +164,46 @@ static void setup_device(struct pci_dev *dev, int max_bar) dev->resource[bar].flags = IORESOURCE_IO; last_addr = last_io; last_io += size; - } else { /* MEM */ + } else if ((mask & PCI_BASE_ADDRESS_MEM_PREFETCH) && + last_mem_pref) /* prefetchable MEM */ { size = -(mask & 0xfffffff0); - DBG(" PCI: pbar%d: mask=%08x memory %d bytes\n", bar, mask, size); + DBG(" PCI: pbar%d: mask=%08x P memory %d bytes\n", + bar, mask, size); + if (last_mem_pref + size > + dev->bus->resource[PCI_BUS_RESOURCE_MEM_PREF]->end) { + DBG("BAR does not fit within bus p-mem res\n"); + return; + } + pci_write_config_dword(dev, PCI_BASE_ADDRESS_0 + bar * 4, last_mem_pref); + dev->resource[bar].flags = IORESOURCE_MEM | + IORESOURCE_PREFETCH; + last_addr = last_mem_pref; + last_mem_pref += size; + } else { /* non-prefetch MEM */ + size = -(mask & 0xfffffff0); + DBG(" PCI: pbar%d: mask=%08x NP memory %d bytes\n", + bar, mask, size); if (last_mem + size > dev->bus->resource[PCI_BUS_RESOURCE_MEM]->end) { - DBG("BAR does not fit within bus mem res\n"); + DBG("BAR does not fit within bus np-mem res\n"); return; } pci_write_config_dword(dev, PCI_BASE_ADDRESS_0 + bar * 4, last_mem); dev->resource[bar].flags = IORESOURCE_MEM; last_addr = last_mem; last_mem += size; - - if ((mask & PCI_BASE_ADDRESS_MEM_TYPE_MASK) == - PCI_BASE_ADDRESS_MEM_TYPE_64) { - dev->resource[bar].flags |= IORESOURCE_MEM_64; - pci_write_config_dword(dev, - PCI_BASE_ADDRESS_1 + bar * 4, 0); - } } dev->resource[bar].start = last_addr; dev->resource[bar].end = last_addr + size - 1; - if (dev->resource[bar].flags & IORESOURCE_MEM_64) + + if ((mask & PCI_BASE_ADDRESS_MEM_TYPE_MASK) == + PCI_BASE_ADDRESS_MEM_TYPE_64) { + dev->resource[bar].flags |= IORESOURCE_MEM_64; + pci_write_config_dword(dev, + PCI_BASE_ADDRESS_1 + bar * 4, 0); bar++; + } } pci_write_config_byte(dev, PCI_COMMAND, cmd); @@ -189,7 +218,9 @@ unsigned int pci_scan_bus(struct pci_bus *bus) unsigned char cmd, tmp, hdr_type, is_multi = 0; DBG("pci_scan_bus for bus %d\n", bus->number); - DBG(" last_io = 0x%08x, last_mem = 0x%08x\n", last_io, last_mem); + DBG(" last_io = 0x%08x, last_mem = 0x%08x, last_mem_pref = 0x%08x\n", + last_io, last_mem, last_mem_pref); + max = bus->secondary; for (devfn = 0; devfn < 0xff; ++devfn) { diff --git a/include/linux/pci.h b/include/linux/pci.h index f5ef588..932acf0 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -162,6 +162,7 @@ struct pci_controller { struct pci_ops *pci_ops; struct resource *mem_resource; + struct resource *mem_pref_resource; unsigned long mem_offset; struct resource *io_resource; unsigned long io_offset; -- 1.9.3 _______________________________________________ barebox mailing list [email protected] http://lists.infradead.org/mailman/listinfo/barebox
