patch-2.3.17 linux/drivers/pci/setup.c

• Lines: 325
• Date: Wed Sep 1 14:37:25 1999
• Orig file: v2.3.16/linux/drivers/pci/setup.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.16/linux/drivers/pci/setup.c linux/drivers/pci/setup.c
@@ -0,0 +1,324 @@
+/*
+ *	drivers/pci/setup.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.
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/errno.h>
+#include <linux/ioport.h>
+
+#include <asm/cache.h>
+#include <asm/pci.h>
+
+
+#define DEBUG_CONFIG 0
+#if DEBUG_CONFIG
+# define DBGC(args)     printk args
+#else
+# define DBGC(args)
+#endif
+
+
+int __init
+pci_claim_resource(struct pci_dev *dev, int resource)
+{
+        struct resource *res = &dev->resource[resource];
+	struct resource *root = pci_find_parent_resource(dev, res);
+	int err;
+
+	err = -EINVAL;
+	if (root != NULL) {
+		/* If `dev' is on a secondary pci bus, `root' may not be
+		   at the origin.  In that case, adjust the resource into
+		   range.  */
+		res->start += root->start;
+		res->end += root->start;
+
+		err = request_resource(root, res);
+	}
+	if (err) {
+		printk(KERN_ERR "PCI: Address space collision on region %d "
+		       "of device %s\n", resource, dev->name);
+	}
+
+	return err;
+}
+
+static void
+pdev_assign_unassigned_resources(struct pci_dev *dev, u32 min_io, u32 min_mem)
+{
+	u32 reg;
+	u16 cmd;
+	int i;
+
+	DBGC(("PCI assign unassigned: (%s)\n", dev->name));
+
+	pci_read_config_word(dev, PCI_COMMAND, &cmd);
+
+	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
+		struct resource *root, *res;
+		unsigned long size, min;
+
+		res = &dev->resource[i];
+
+		if (res->flags & IORESOURCE_IO)
+			cmd |= PCI_COMMAND_IO;
+		else if (res->flags & IORESOURCE_MEM)
+			cmd |= PCI_COMMAND_MEMORY;
+
+		/* If it is already assigned or the resource does
+		   not exist, there is nothing to do.  */
+		if (res->parent != NULL || res->flags == 0)
+			continue;
+
+		/* Determine the root we allocate from.  */
+		root = pci_find_parent_resource(dev, res);
+		if (root == NULL)
+			continue;
+
+		min = (res->flags & IORESOURCE_IO ? min_io : min_mem);
+		min += root->start;
+		size = res->end - res->start + 1;
+
+		DBGC(("  for root[%lx:%lx] min[%lx] size[%lx]\n",
+		      root->start, root->end, min, size));
+
+		if (allocate_resource(root, res, size, min, -1, size) < 0) {
+			printk(KERN_ERR
+			       "PCI: Failed to allocate resource %d for %s\n",
+			       i, dev->name);
+			continue;
+		}
+
+		DBGC(("  got res[%lx:%lx] for resource %d\n",
+		      res->start, res->end, i));
+
+		/* Update PCI config space.  */
+		pcibios_update_resource(dev, root, res, i);
+	}
+
+	/* Special case, disable the ROM.  Several devices act funny
+	   (ie. do not respond to memory space writes) when it is left
+	   enabled.  A good example are QlogicISP adapters.  */
+
+	pci_read_config_dword(dev, PCI_ROM_ADDRESS, &reg);
+	reg &= ~PCI_ROM_ADDRESS_ENABLE;
+	pci_write_config_dword(dev, PCI_ROM_ADDRESS, reg);
+
+	/* All of these (may) have I/O scattered all around and may not
+	   use I/O base address registers at all.  So we just have to
+	   always enable IO to these devices.  */
+	if ((dev->class >> 8) == PCI_CLASS_NOT_DEFINED
+	    || (dev->class >> 8) == PCI_CLASS_NOT_DEFINED_VGA
+	    || (dev->class >> 8) == PCI_CLASS_STORAGE_IDE
+	    || (dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
+		cmd |= PCI_COMMAND_IO;
+	}
+
+	/* ??? Always turn on bus mastering.  If the device doesn't support
+	   it, the bit will go into the bucket. */
+	cmd |= PCI_COMMAND_MASTER;
+
+	/* Enable the appropriate bits in the PCI command register.  */
+	pci_write_config_word(dev, PCI_COMMAND, cmd);
+
+	DBGC(("  cmd reg 0x%x\n", cmd));
+
+	/* If this is a PCI bridge, set the cache line correctly.  */
+	if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
+		pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE,
+				      (L1_CACHE_BYTES / sizeof(u32)));
+	}
+}
+
+void __init
+pci_assign_unassigned_resources(u32 min_io, u32 min_mem)
+{
+	struct pci_dev *dev;
+	for (dev = pci_devices; dev; dev = dev->next)
+		pdev_assign_unassigned_resources(dev, min_io, min_mem);
+}
+
+struct pbus_set_ranges_data
+{
+	int found_vga;
+	unsigned int io_start, io_end;
+	unsigned int mem_start, mem_end;
+};
+
+#define ROUND_UP(x, a)		(((x) + (a) - 1) & ~((a) - 1))
+#define ROUND_DOWN(x, a)	((x) & ~((a) - 1))
+
+static void __init
+pbus_set_ranges(struct pci_bus *bus, struct pbus_set_ranges_data *outer)
+{
+	struct pbus_set_ranges_data inner;
+	struct pci_bus *child;
+	struct pci_dev *dev;
+
+	inner.found_vga = 0;
+	inner.mem_start = inner.io_start = ~0;
+	inner.mem_end = inner.io_end = 0;
+
+	/* Collect information about how our direct children are layed out. */
+	for (dev = bus->devices; dev; dev = dev->sibling) {
+		int i;
+		for (i = 0; i < PCI_NUM_RESOURCES; i++) {
+			struct resource *res = &dev->resource[i];
+			if (res->flags & IORESOURCE_IO) {
+				if (res->start < inner.io_start)
+					inner.io_start = res->start;
+				if (res->end > inner.io_end)
+					inner.io_end = res->end;
+			} else if (res->flags & IORESOURCE_MEM) {
+				if (res->start < inner.mem_start)
+					inner.mem_start = res->start;
+				if (res->end > inner.mem_end)
+					inner.mem_end = res->end;
+			}
+		}
+                if ((dev->class >> 8) == PCI_CLASS_DISPLAY_VGA)
+                        inner.found_vga = 1;
+	}
+
+	/* And for all of the sub-busses.  */
+	for (child = bus->children; child; child = child->next)
+		pbus_set_ranges(child, &inner);
+
+	/* Align the values.  */
+	inner.io_start = ROUND_DOWN(inner.io_start, 4*1024);
+	inner.io_end = ROUND_UP(inner.io_end, 4*1024);
+
+	inner.mem_start = ROUND_DOWN(inner.mem_start, 1*1024*1024);
+	inner.mem_end = ROUND_UP(inner.mem_end, 1*1024*1024);
+
+	/* Configure the bridge, if possible.  */
+	if (bus->self) {
+		struct pci_dev *bridge = bus->self;
+		u32 l;
+
+                /* Set up the top and bottom of the PCI I/O segment
+                   for this bus.  */
+                pci_read_config_dword(bridge, PCI_IO_BASE, &l);
+                l &= 0xffff0000;
+                l |= (inner.io_start >> 8) & 0x00f0;
+		l |= (inner.io_end - 1) & 0xf000;
+                pci_write_config_dword(bridge, PCI_IO_BASE, l);
+
+                /*
+                 * Clear out the upper 16 bits of IO base/limit.
+                 * Clear out the upper 32 bits of PREF base/limit.
+                 */
+                pci_write_config_dword(bridge, PCI_IO_BASE_UPPER16, 0);
+                pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32, 0);
+                pci_write_config_dword(bridge, PCI_PREF_LIMIT_UPPER32, 0);
+
+                /* Set up the top and bottom of the PCI Memory segment
+                   for this bus.  */
+                l = (inner.mem_start & 0xfff00000) >> 16;
+		l |= (inner.mem_end - 1) & 0xfff00000;
+                pci_write_config_dword(bridge, PCI_MEMORY_BASE, l);
+
+                /*
+                 * Turn off downstream PF memory address range, unless
+                 * there is a VGA behind this bridge, in which case, we
+                 * enable the PREFETCH range to include BIOS ROM at C0000.
+                 *
+                 * NOTE: this is a bit of a hack, done with PREFETCH for
+                 * simplicity, rather than having to add it into the above
+                 * non-PREFETCH range, which could then be bigger than we want.
+                 * We might assume that we could relocate the BIOS ROM, but
+                 * that would depend on having it found by those who need it
+                 * (the DEC BIOS emulator would find it, but I do not know
+                 * about the Xservers). So, we do it this way for now... ;-)
+                 */
+                l = (inner.found_vga) ? 0 : 0x0000ffff;
+                pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE, l);
+
+                /*
+                 * Tell bridge that there is an ISA bus in the system,
+                 * and (possibly) a VGA as well.
+                 */
+                l = (inner.found_vga) ? 0x0c : 0x04;
+                pci_write_config_byte(bridge, PCI_BRIDGE_CONTROL, l);
+
+                /*
+                 * Clear status bits,
+                 * turn on I/O    enable (for downstream I/O),
+                 * turn on memory enable (for downstream memory),
+                 * turn on master enable (for upstream memory and I/O).
+                 */
+                pci_write_config_dword(bridge, PCI_COMMAND, 0xffff0007);
+	}
+
+	if (outer) {
+		outer->found_vga |= inner.found_vga;
+		if (inner.io_start < outer->io_start)
+			outer->io_start = inner.io_start;
+		if (inner.io_end > outer->io_end)
+			outer->io_end = inner.io_end;
+		if (inner.mem_start < outer->mem_start)
+			outer->mem_start = inner.mem_start;
+		if (inner.mem_end > outer->mem_end)
+			outer->mem_end = inner.mem_end;
+	}
+}
+
+void __init
+pci_set_bus_ranges(void)
+{
+	struct pci_bus *bus;
+	for (bus = pci_root; bus; bus = bus->next)
+		pbus_set_ranges(bus, NULL);
+}
+
+static void
+pdev_fixup_irq(struct pci_dev *dev,
+	       u8 (*swizzle)(struct pci_dev *, u8 *),
+	       int (*map_irq)(struct pci_dev *, u8, u8))
+{
+	u8 pin, slot;
+	int irq;
+
+	/* If this device is not on the primary bus, we need to figure out
+	   which interrupt pin it will come in on.   We know which slot it
+	   will come in on 'cos that slot is where the bridge is.   Each
+	   time the interrupt line passes through a PCI-PCI bridge we must
+	   apply the swizzle function.  */
+
+	pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
+	/* Cope with 0 and illegal. */
+	if (pin == 0 || pin > 4)
+		pin = 1;
+
+	/* Follow the chain of bridges, swizzling as we go.  */
+	slot = (*swizzle)(dev, &pin);
+
+	irq = (*map_irq)(dev, slot, pin);
+	if (irq == -1)
+		irq = 0;
+	dev->irq = irq;
+
+	DBGC(("PCI fixup irq: (%s) got %d\n", dev->name, dev->irq));
+
+	/* Always tell the device, so the driver knows what is
+	   the real IRQ to use; the device does not use it. */
+	pcibios_update_irq(dev, irq);
+}
+
+void __init
+pci_fixup_irqs(u8 (*swizzle)(struct pci_dev *, u8 *),
+	       int (*map_irq)(struct pci_dev *, u8, u8))
+{
+	struct pci_dev *dev;
+	for (dev = pci_devices; dev; dev = dev->next)
+		pdev_fixup_irq(dev, swizzle, map_irq);
+}