Following comments from Ivan, the following patches changed:
pci-9
only enable ROM resources if res->flags has PCI_ROM_ADDRESS_ENABLE set.
pci-10
don't use PCI_BUS_NUM_RESOURCES here - PPC machines can (in theory) have
more than 4 primary bus resources.
pci-11
breaks Alpha Nautilus host bridge sizing - patch dropped from patch set.
For those trying the above out, please apply the following patch on top of
-mm7:
diff -ur orig/drivers/pci/setup-res.c linux/drivers/pci/setup-res.c
--- orig/drivers/pci/setup-res.c Sat Mar 15 09:54:19 2003
+++ linux/drivers/pci/setup-res.c Sat Mar 15 09:55:38 2003
@@ -55,8 +55,7 @@
if (resno < 6) {
reg = PCI_BASE_ADDRESS_0 + 4 * resno;
} else if (resno == PCI_ROM_RESOURCE) {
- res->flags |= PCI_ROM_ADDRESS_ENABLE;
- new |= PCI_ROM_ADDRESS_ENABLE;
+ new |= res->flags & PCI_ROM_ADDRESS_ENABLE;
reg = dev->rom_base_reg;
} else {
/* Hmm, non-standard resource. */
diff -ur orig/drivers/pci/probe.c linux/drivers/pci/probe.c
--- orig/drivers/pci/probe.c Sat Mar 15 09:59:15 2003
+++ linux/drivers/pci/probe.c Sat Mar 15 09:58:47 2003
@@ -256,7 +256,7 @@
child->subordinate = 0xff;
/* Set up default resource pointers and names.. */
- for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
+ for (i = 0; i < 4; i++) {
child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i];
child->resource[i]->name = child->name;
}
diff -ur orig/drivers/pci/setup-bus.c linux/drivers/pci/setup-bus.c
--- orig/drivers/pci/setup-bus.c Sat Mar 15 10:01:05 2003
+++ linux/drivers/pci/setup-bus.c Sat Mar 15 09:58:44 2003
@@ -36,13 +36,6 @@
#define ROUND_UP(x, a) (((x) + (a) - 1) & ~((a) - 1))
-/*
- * FIXME: IO should be max 256 bytes. However, since we may
- * have a P2P bridge below a cardbus bridge, we need 4K.
- */
-#define CARDBUS_IO_SIZE (4096)
-#define CARDBUS_MEM_SIZE (32*1024*1024)
-
static int __devinit
pbus_assign_resources_sorted(struct pci_bus *bus)
{
@@ -74,59 +67,6 @@
return found_vga;
}
-static void __devinit pci_setup_cardbus(struct pci_bus *bus)
-{
- struct pci_dev *bridge = bus->self;
- struct pci_bus_region region;
-
- printk("PCI: Bus %d, cardbus bridge: %s\n",
- bus->number, bridge->slot_name);
-
- pcibios_resource_to_bus(bridge, ®ion, bus->resource[0]);
- if (bus->resource[0]->flags & IORESOURCE_IO) {
- /*
- * The IO resource is allocated a range twice as large as it
- * would normally need. This allows us to set both IO regs.
- */
- printk(" IO window: %08lx-%08lx\n",
- region.start, region.end);
- pci_write_config_dword(bridge, PCI_CB_IO_BASE_0,
- region.start);
- pci_write_config_dword(bridge, PCI_CB_IO_LIMIT_0,
- region.end);
- }
-
- pcibios_resource_to_bus(bridge, ®ion, bus->resource[1]);
- if (bus->resource[1]->flags & IORESOURCE_IO) {
- printk(" IO window: %08lx-%08lx\n",
- region.start, region.end);
- pci_write_config_dword(bridge, PCI_CB_IO_BASE_1,
- region.start);
- pci_write_config_dword(bridge, PCI_CB_IO_LIMIT_1,
- region.end);
- }
-
- pcibios_resource_to_bus(bridge, ®ion, bus->resource[2]);
- if (bus->resource[2]->flags & IORESOURCE_MEM) {
- printk(" PREFETCH window: %08lx-%08lx\n",
- region.start, region.end);
- pci_write_config_dword(bridge, PCI_CB_MEMORY_BASE_0,
- region.start);
- pci_write_config_dword(bridge, PCI_CB_MEMORY_LIMIT_0,
- region.end);
- }
-
- pcibios_resource_to_bus(bridge, ®ion, bus->resource[3]);
- if (bus->resource[3]->flags & IORESOURCE_MEM) {
- printk(" MEM window: %08lx-%08lx\n",
- region.start, region.end);
- pci_write_config_dword(bridge, PCI_CB_MEMORY_BASE_1,
- region.start);
- pci_write_config_dword(bridge, PCI_CB_MEMORY_LIMIT_1,
- region.end);
- }
-}
-
/* Initialize bridges with base/limit values we have collected.
PCI-to-PCI Bridge Architecture Specification rev. 1.1 (1998)
requires that if there is no I/O ports or memory behind the
@@ -214,6 +154,9 @@
struct pci_dev *bridge = bus->self;
struct resource *b_res;
+ if (!bridge || (bridge->class >> 8) != PCI_CLASS_BRIDGE_PCI)
+ return;
+
b_res = &bridge->resource[PCI_BRIDGE_RESOURCES];
b_res[1].flags |= IORESOURCE_MEM;
@@ -245,10 +188,11 @@
since these windows have 4K granularity and the IO ranges
of non-bridge PCI devices are limited to 256 bytes.
We must be careful with the ISA aliasing though. */
-static void __devinit pbus_size_io(struct pci_bus *bus, int resno)
+static void __devinit
+pbus_size_io(struct pci_bus *bus)
{
struct pci_dev *dev;
- struct resource *b_res = bus->resource[resno];
+ struct resource *b_res = bus->resource[0];
unsigned long size = 0, size1 = 0;
if (!(b_res->flags & IORESOURCE_IO))
@@ -271,6 +215,9 @@
else
size1 += r_size;
}
+ /* ??? Reserve some resources for CardBus. */
+ if ((dev->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS)
+ size1 += 4*1024;
}
/* To be fixed in 2.5: we should have sort of HAVE_ISA
flag in the struct pci_bus. */
@@ -290,13 +237,14 @@
/* Calculate the size of the bus and minimal alignment which
guarantees that all child resources fit in this size. */
static void __devinit
-pbus_size_mem(struct pci_bus *bus, int resno, unsigned long mask, unsigned long type)
+pbus_size_mem(struct pci_bus *bus, unsigned long mask, unsigned long type)
{
- struct resource *b_res = bus->resource[resno];
struct pci_dev *dev;
unsigned long min_align, align, size;
unsigned long aligns[12]; /* Alignments from 1Mb to 2Gb */
int order, max_order;
+ struct resource *b_res = (type & IORESOURCE_PREFETCH) ?
+ bus->resource[2] : bus->resource[1];
memset(aligns, 0, sizeof(aligns));
max_order = 0;
@@ -332,6 +280,11 @@
if (order > max_order)
max_order = order;
}
+ /* ??? Reserve some resources for CardBus. */
+ if ((dev->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) {
+ size += 1UL << 24; /* 16 Mb */
+ aligns[24 - 20] += 1UL << 24;
+ }
}
align = 0;
@@ -354,104 +307,37 @@
b_res->end = size + min_align - 1;
}
-static void __devinit pci_bus_size_cardbus(struct pci_bus *bus)
-{
- struct pci_dev *bridge = bus->self;
- struct resource *b_res = &bridge->resource[PCI_BRIDGE_RESOURCES];
- u16 ctrl;
-
- /*
- * Reserve some resources for CardBus. We reserve
- * a fixed amount of bus space for CardBus bridges.
- */
- b_res[0].start = CARDBUS_IO_SIZE;
- b_res[0].end = b_res[0].start + CARDBUS_IO_SIZE - 1;
- b_res[0].flags |= IORESOURCE_IO;
-
- b_res[1].start = CARDBUS_IO_SIZE;
- b_res[1].end = b_res[1].start + CARDBUS_IO_SIZE - 1;
- b_res[1].flags |= IORESOURCE_IO;
-
- /*
- * Check whether prefetchable memory is supported
- * by this bridge.
- */
- pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl);
- if (!(ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM0)) {
- ctrl |= PCI_CB_BRIDGE_CTL_PREFETCH_MEM0;
- pci_write_config_word(bridge, PCI_CB_BRIDGE_CONTROL, ctrl);
- pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl);
- }
-
- /*
- * If we have prefetchable memory support, allocate
- * two regions. Otherwise, allocate one region of
- * twice the size.
- */
- if (ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM0) {
- b_res[2].start = CARDBUS_MEM_SIZE;
- b_res[2].end = b_res[2].start + CARDBUS_MEM_SIZE - 1;
- b_res[2].flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH;
-
- b_res[3].start = CARDBUS_MEM_SIZE;
- b_res[3].end = b_res[3].start + CARDBUS_MEM_SIZE - 1;
- b_res[3].flags |= IORESOURCE_MEM;
- } else {
- b_res[3].start = CARDBUS_MEM_SIZE * 2;
- b_res[3].end = b_res[3].start + CARDBUS_MEM_SIZE * 2 - 1;
- b_res[3].flags |= IORESOURCE_MEM;
- }
-}
-
void __devinit
pci_bus_size_bridges(struct pci_bus *bus)
{
- struct pci_dev *dev;
- unsigned long mask;
+ struct pci_bus *b;
+ unsigned long mask, type;
- list_for_each_entry(dev, &bus->devices, bus_list) {
- struct pci_bus *b = dev->subordinate;
- if (!b)
- continue;
-
- switch (dev->class >> 8) {
- case PCI_CLASS_BRIDGE_PCI:
- pci_bus_size_bridges(b);
- break;
-
- case PCI_CLASS_BRIDGE_CARDBUS:
- pci_bus_size_cardbus(b);
- break;
- }
+ list_for_each_entry(b, &bus->children, node) {
+ pci_bus_size_bridges(b);
}
/* The root bus? */
if (!bus->self)
return;
- switch (bus->self->class >> 8) {
- case PCI_CLASS_BRIDGE_PCI:
- pci_bridge_check_ranges(bus);
- pbus_size_io(bus, 0);
- mask = IORESOURCE_MEM;
- /* If the bridge supports prefetchable range, size it separately. */
- if (bus->resource[2] &&
- bus->resource[2]->flags & IORESOURCE_PREFETCH) {
- pbus_size_mem(bus, 2, IORESOURCE_PREFETCH | IORESOURCE_MEM,
- IORESOURCE_PREFETCH | IORESOURCE_MEM);
- mask |= IORESOURCE_PREFETCH; /* Size non-prefetch only. */
- }
- pbus_size_mem(bus, 1, mask, IORESOURCE_MEM);
- break;
+ pci_bridge_check_ranges(bus);
+
+ pbus_size_io(bus);
- case PCI_CLASS_BRIDGE_CARDBUS:
- /* don't size cardbuses yet. */
- break;
+ mask = type = IORESOURCE_MEM;
+ /* If the bridge supports prefetchable range, size it separately. */
+ if (bus->resource[2] &&
+ bus->resource[2]->flags & IORESOURCE_PREFETCH) {
+ pbus_size_mem(bus, IORESOURCE_PREFETCH, IORESOURCE_PREFETCH);
+ mask |= IORESOURCE_PREFETCH; /* Size non-prefetch only. */
}
+ pbus_size_mem(bus, mask, type);
}
EXPORT_SYMBOL(pci_bus_size_bridges);
-void __devinit pci_bus_assign_resources(struct pci_bus *bus)
+void __devinit
+pci_bus_assign_resources(struct pci_bus *bus)
{
struct pci_bus *b;
int found_vga = pbus_assign_resources_sorted(bus);
@@ -465,24 +351,9 @@
}
list_for_each_entry(dev, &bus->devices, bus_list) {
b = dev->subordinate;
- if (!b)
- continue;
-
- pci_bus_assign_resources(b);
-
- switch (dev->class >> 8) {
- case PCI_CLASS_BRIDGE_PCI:
+ if (b) {
+ pci_bus_assign_resources(b);
pci_setup_bridge(b);
- break;
-
- case PCI_CLASS_BRIDGE_CARDBUS:
- pci_setup_cardbus(b);
- break;
-
- default:
- printk(KERN_INFO "PCI: not setting up bridge %s "
- "for bus %d\n", dev->slot_name, b->number);
- break;
}
}
}
--
Russell King (rmk@arm.linux.org.uk) The developer of ARM Linux
http://www.arm.linux.org.uk/personal/aboutme.html
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