Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 552 insertions, 0 deletions

diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
new file mode 100644
index 0000000..1ba84be
--- /dev/null
+++ b/drivers/pci/setup-bus.c
@@ -0,0 +1,552 @@
+/*
+ *	drivers/pci/setup-bus.c
+ *
+ * Extruded from code written by
+ *      Dave Rusling (david.rusling@reo.mts.dec.com)
+ *      David Mosberger (davidm@cs.arizona.edu)
+ *	David Miller (davem@redhat.com)
+ *
+ * Support routines for initializing a PCI subsystem.
+ */
+
+/*
+ * Nov 2000, Ivan Kokshaysky <ink@jurassic.park.msu.ru>
+ *	     PCI-PCI bridges cleanup, sorted resource allocation.
+ * Feb 2002, Ivan Kokshaysky <ink@jurassic.park.msu.ru>
+ *	     Converted to allocation in 3 passes, which gives
+ *	     tighter packing. Prefetchable range support.
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/errno.h>
+#include <linux/ioport.h>
+#include <linux/cache.h>
+#include <linux/slab.h>
+
+
+#define DEBUG_CONFIG 1
+#if DEBUG_CONFIG
+#define DBG(x...)     printk(x)
+#else
+#define DBG(x...)
+#endif
+
+#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 void __devinit
+pbus_assign_resources_sorted(struct pci_bus *bus)
+{
+	struct pci_dev *dev;
+	struct resource *res;
+	struct resource_list head, *list, *tmp;
+	int idx;
+
+	bus->bridge_ctl &= ~PCI_BRIDGE_CTL_VGA;
+
+	head.next = NULL;
+	list_for_each_entry(dev, &bus->devices, bus_list) {
+		u16 class = dev->class >> 8;
+
+		/* Don't touch classless devices and host bridges.  */
+		if (class == PCI_CLASS_NOT_DEFINED ||
+		    class == PCI_CLASS_BRIDGE_HOST)
+			continue;
+
+		if (class == PCI_CLASS_DISPLAY_VGA ||
+		    class == PCI_CLASS_NOT_DEFINED_VGA)
+			bus->bridge_ctl |= PCI_BRIDGE_CTL_VGA;
+
+		pdev_sort_resources(dev, &head);
+	}
+
+	for (list = head.next; list;) {
+		res = list->res;
+		idx = res - &list->dev->resource[0];
+		pci_assign_resource(list->dev, idx);
+		tmp = list;
+		list = list->next;
+		kfree(tmp);
+	}
+}
+
+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, pci_name(bridge));
+
+	pcibios_resource_to_bus(bridge, &region, 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, &region, 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, &region, 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, &region, 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
+   bridge, corresponding range must be turned off by writing base
+   value greater than limit to the bridge's base/limit registers.
+
+   Note: care must be taken when updating I/O base/limit registers
+   of bridges which support 32-bit I/O. This update requires two
+   config space writes, so it's quite possible that an I/O window of
+   the bridge will have some undesirable address (e.g. 0) after the
+   first write. Ditto 64-bit prefetchable MMIO.  */
+static void __devinit
+pci_setup_bridge(struct pci_bus *bus)
+{
+	struct pci_dev *bridge = bus->self;
+	struct pci_bus_region region;
+	u32 l, io_upper16;
+
+	DBG(KERN_INFO "PCI: Bridge: %s\n", pci_name(bridge));
+
+	/* Set up the top and bottom of the PCI I/O segment for this bus. */
+	pcibios_resource_to_bus(bridge, &region, bus->resource[0]);
+	if (bus->resource[0]->flags & IORESOURCE_IO) {
+		pci_read_config_dword(bridge, PCI_IO_BASE, &l);
+		l &= 0xffff0000;
+		l |= (region.start >> 8) & 0x00f0;
+		l |= region.end & 0xf000;
+		/* Set up upper 16 bits of I/O base/limit. */
+		io_upper16 = (region.end & 0xffff0000) | (region.start >> 16);
+		DBG(KERN_INFO "  IO window: %04lx-%04lx\n",
+				region.start, region.end);
+	}
+	else {
+		/* Clear upper 16 bits of I/O base/limit. */
+		io_upper16 = 0;
+		l = 0x00f0;
+		DBG(KERN_INFO "  IO window: disabled.\n");
+	}
+	/* Temporarily disable the I/O range before updating PCI_IO_BASE. */
+	pci_write_config_dword(bridge, PCI_IO_BASE_UPPER16, 0x0000ffff);
+	/* Update lower 16 bits of I/O base/limit. */
+	pci_write_config_dword(bridge, PCI_IO_BASE, l);
+	/* Update upper 16 bits of I/O base/limit. */
+	pci_write_config_dword(bridge, PCI_IO_BASE_UPPER16, io_upper16);
+
+	/* Set up the top and bottom of the PCI Memory segment
+	   for this bus. */
+	pcibios_resource_to_bus(bridge, &region, bus->resource[1]);
+	if (bus->resource[1]->flags & IORESOURCE_MEM) {
+		l = (region.start >> 16) & 0xfff0;
+		l |= region.end & 0xfff00000;
+		DBG(KERN_INFO "  MEM window: %08lx-%08lx\n",
+				region.start, region.end);
+	}
+	else {
+		l = 0x0000fff0;
+		DBG(KERN_INFO "  MEM window: disabled.\n");
+	}
+	pci_write_config_dword(bridge, PCI_MEMORY_BASE, l);
+
+	/* Clear out the upper 32 bits of PREF limit.
+	   If PCI_PREF_BASE_UPPER32 was non-zero, this temporarily
+	   disables PREF range, which is ok. */
+	pci_write_config_dword(bridge, PCI_PREF_LIMIT_UPPER32, 0);
+
+	/* Set up PREF base/limit. */
+	pcibios_resource_to_bus(bridge, &region, bus->resource[2]);
+	if (bus->resource[2]->flags & IORESOURCE_PREFETCH) {
+		l = (region.start >> 16) & 0xfff0;
+		l |= region.end & 0xfff00000;
+		DBG(KERN_INFO "  PREFETCH window: %08lx-%08lx\n",
+				region.start, region.end);
+	}
+	else {
+		l = 0x0000fff0;
+		DBG(KERN_INFO "  PREFETCH window: disabled.\n");
+	}
+	pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE, l);
+
+	/* Clear out the upper 32 bits of PREF base. */
+	pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32, 0);
+
+	pci_write_config_word(bridge, PCI_BRIDGE_CONTROL, bus->bridge_ctl);
+}
+
+/* Check whether the bridge supports optional I/O and
+   prefetchable memory ranges. If not, the respective
+   base/limit registers must be read-only and read as 0. */
+static void __devinit
+pci_bridge_check_ranges(struct pci_bus *bus)
+{
+	u16 io;
+	u32 pmem;
+	struct pci_dev *bridge = bus->self;
+	struct resource *b_res;
+
+	b_res = &bridge->resource[PCI_BRIDGE_RESOURCES];
+	b_res[1].flags |= IORESOURCE_MEM;
+
+	pci_read_config_word(bridge, PCI_IO_BASE, &io);
+	if (!io) {
+		pci_write_config_word(bridge, PCI_IO_BASE, 0xf0f0);
+		pci_read_config_word(bridge, PCI_IO_BASE, &io);
+ 		pci_write_config_word(bridge, PCI_IO_BASE, 0x0);
+ 	}
+ 	if (io)
+		b_res[0].flags |= IORESOURCE_IO;
+	/*  DECchip 21050 pass 2 errata: the bridge may miss an address
+	    disconnect boundary by one PCI data phase.
+	    Workaround: do not use prefetching on this device. */
+	if (bridge->vendor == PCI_VENDOR_ID_DEC && bridge->device == 0x0001)
+		return;
+	pci_read_config_dword(bridge, PCI_PREF_MEMORY_BASE, &pmem);
+	if (!pmem) {
+		pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE,
+					       0xfff0fff0);
+		pci_read_config_dword(bridge, PCI_PREF_MEMORY_BASE, &pmem);
+		pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE, 0x0);
+	}
+	if (pmem)
+		b_res[2].flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH;
+}
+
+/* Helper function for sizing routines: find first available
+   bus resource of a given type. Note: we intentionally skip
+   the bus resources which have already been assigned (that is,
+   have non-NULL parent resource). */
+static struct resource * __devinit
+find_free_bus_resource(struct pci_bus *bus, unsigned long type)
+{
+	int i;
+	struct resource *r;
+	unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
+				  IORESOURCE_PREFETCH;
+
+	for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
+		r = bus->resource[i];
+		if (r && (r->flags & type_mask) == type && !r->parent)
+			return r;
+	}
+	return NULL;
+}
+
+/* Sizing the IO windows of the PCI-PCI bridge is trivial,
+   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)
+{
+	struct pci_dev *dev;
+	struct resource *b_res = find_free_bus_resource(bus, IORESOURCE_IO);
+	unsigned long size = 0, size1 = 0;
+
+	if (!b_res)
+ 		return;
+
+	list_for_each_entry(dev, &bus->devices, bus_list) {
+		int i;
+
+		for (i = 0; i < PCI_NUM_RESOURCES; i++) {
+			struct resource *r = &dev->resource[i];
+			unsigned long r_size;
+
+			if (r->parent || !(r->flags & IORESOURCE_IO))
+				continue;
+			r_size = r->end - r->start + 1;
+
+			if (r_size < 0x400)
+				/* Might be re-aligned for ISA */
+				size += r_size;
+			else
+				size1 += r_size;
+		}
+	}
+/* To be fixed in 2.5: we should have sort of HAVE_ISA
+   flag in the struct pci_bus. */
+#if defined(CONFIG_ISA) || defined(CONFIG_EISA)
+	size = (size & 0xff) + ((size & ~0xffUL) << 2);
+#endif
+	size = ROUND_UP(size + size1, 4096);
+	if (!size) {
+		b_res->flags = 0;
+		return;
+	}
+	/* Alignment of the IO window is always 4K */
+	b_res->start = 4096;
+	b_res->end = b_res->start + size - 1;
+}
+
+/* Calculate the size of the bus and minimal alignment which
+   guarantees that all child resources fit in this size. */
+static int __devinit
+pbus_size_mem(struct pci_bus *bus, unsigned long mask, unsigned long type)
+{
+	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 = find_free_bus_resource(bus, type);
+
+	if (!b_res)
+		return 0;
+
+	memset(aligns, 0, sizeof(aligns));
+	max_order = 0;
+	size = 0;
+
+	list_for_each_entry(dev, &bus->devices, bus_list) {
+		int i;
+		
+		for (i = 0; i < PCI_NUM_RESOURCES; i++) {
+			struct resource *r = &dev->resource[i];
+			unsigned long r_size;
+
+			if (r->parent || (r->flags & mask) != type)
+				continue;
+			r_size = r->end - r->start + 1;
+			/* For bridges size != alignment */
+			align = (i < PCI_BRIDGE_RESOURCES) ? r_size : r->start;
+			order = __ffs(align) - 20;
+			if (order > 11) {
+				printk(KERN_WARNING "PCI: region %s/%d "
+				       "too large: %lx-%lx\n",
+				       pci_name(dev), i, r->start, r->end);
+				r->flags = 0;
+				continue;
+			}
+			size += r_size;
+			if (order < 0)
+				order = 0;
+			/* Exclude ranges with size > align from
+			   calculation of the alignment. */
+			if (r_size == align)
+				aligns[order] += align;
+			if (order > max_order)
+				max_order = order;
+		}
+	}
+
+	align = 0;
+	min_align = 0;
+	for (order = 0; order <= max_order; order++) {
+		unsigned long align1 = 1UL << (order + 20);
+
+		if (!align)
+			min_align = align1;
+		else if (ROUND_UP(align + min_align, min_align) < align1)
+			min_align = align1 >> 1;
+		align += aligns[order];
+	}
+	size = ROUND_UP(size, min_align);
+	if (!size) {
+		b_res->flags = 0;
+		return 1;
+	}
+	b_res->start = min_align;
+	b_res->end = size + min_align - 1;
+	return 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, prefmask;
+
+	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_CARDBUS:
+			pci_bus_size_cardbus(b);
+			break;
+
+		case PCI_CLASS_BRIDGE_PCI:
+		default:
+			pci_bus_size_bridges(b);
+			break;
+		}
+	}
+
+	/* The root bus? */
+	if (!bus->self)
+		return;
+
+	switch (bus->self->class >> 8) {
+	case PCI_CLASS_BRIDGE_CARDBUS:
+		/* don't size cardbuses yet. */
+		break;
+
+	case PCI_CLASS_BRIDGE_PCI:
+		pci_bridge_check_ranges(bus);
+	default:
+		pbus_size_io(bus);
+		/* If the bridge supports prefetchable range, size it
+		   separately. If it doesn't, or its prefetchable window
+		   has already been allocated by arch code, try
+		   non-prefetchable range for both types of PCI memory
+		   resources. */
+		mask = IORESOURCE_MEM;
+		prefmask = IORESOURCE_MEM | IORESOURCE_PREFETCH;
+		if (pbus_size_mem(bus, prefmask, prefmask))
+			mask = prefmask; /* Success, size non-prefetch only. */
+		pbus_size_mem(bus, mask, IORESOURCE_MEM);
+		break;
+	}
+}
+EXPORT_SYMBOL(pci_bus_size_bridges);
+
+void __devinit
+pci_bus_assign_resources(struct pci_bus *bus)
+{
+	struct pci_bus *b;
+	struct pci_dev *dev;
+
+	pbus_assign_resources_sorted(bus);
+
+	if (bus->bridge_ctl & PCI_BRIDGE_CTL_VGA) {
+		/* Propagate presence of the VGA to upstream bridges */
+		for (b = bus; b->parent; b = b->parent) {
+			b->bridge_ctl |= PCI_BRIDGE_CTL_VGA;
+		}
+	}
+	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:
+			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", pci_name(dev), b->number);
+			break;
+		}
+	}
+}
+EXPORT_SYMBOL(pci_bus_assign_resources);
+
+void __init
+pci_assign_unassigned_resources(void)
+{
+	struct pci_bus *bus;
+
+	/* Depth first, calculate sizes and alignments of all
+	   subordinate buses. */
+	list_for_each_entry(bus, &pci_root_buses, node) {
+		pci_bus_size_bridges(bus);
+	}
+	/* Depth last, allocate resources and update the hardware. */
+	list_for_each_entry(bus, &pci_root_buses, node) {
+		pci_bus_assign_resources(bus);
+		pci_enable_bridges(bus);
+	}
+}