From e9a271e32c53076445ef70da8aec8201c82693ec Mon Sep 17 00:00:00 2001
From: Eric Biederman <ebiederm@xmission.com>
Date: Tue, 2 Sep 2003 03:36:25 +0000
Subject: - Major update of the dynamic device tree so it can handle   *
 subtractive resources   * merging with the static device tree   * more device
 types than just pci - The piece to watch out for is the new enable_resources
 method that was needed in all of the drivers

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1096 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
---
 src/devices/root_device.c | 127 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 127 insertions(+)
 create mode 100644 src/devices/root_device.c

(limited to 'src/devices/root_device.c')

diff --git a/src/devices/root_device.c b/src/devices/root_device.c
new file mode 100644
index 0000000000..c05a2cd015
--- /dev/null
+++ b/src/devices/root_device.c
@@ -0,0 +1,127 @@
+#include <console/console.h>
+#include <device/device.h>
+#include <device/pci.h>
+
+/** 
+ * Read the resources for the root device,
+ * that encompase the resources for the entire system.
+ * @param root Pointer to the device structure for the system root device
+ */
+void root_dev_read_resources(device_t root)
+{
+	int res = 0;
+
+	/* Initialize the system wide io space constraints */
+	root->resource[res].base  = 0x400;
+	root->resource[res].size  = 0;
+	root->resource[res].align = 0;
+	root->resource[res].gran  = 0;
+	root->resource[res].limit = 0xffffUL;
+	root->resource[res].flags = IORESOURCE_IO;
+	root->resource[res].index = 0;
+	compute_allocate_resource(&root->link[0], &root->resource[res], 
+		IORESOURCE_IO, IORESOURCE_IO);
+	res++;
+
+	/* Initialize the system wide memory resources constraints */
+	root->resource[res].base  = 0;
+	root->resource[res].size  = 0;
+	root->resource[res].align = 0;
+	root->resource[res].gran  = 0;
+	root->resource[res].limit = 0xffffffffUL;
+	root->resource[res].flags = IORESOURCE_MEM;
+	root->resource[res].index = 1;
+	compute_allocate_resource(&root->link[0], &root->resource[res], 
+		IORESOURCE_MEM, IORESOURCE_MEM);
+	res++;
+
+	root->resources = res;
+}
+
+/**
+ * Write the resources for the root device,
+ * and every device under it which are all of the devices.
+ * @param root Pointer to the device structure for the system root device
+ */
+void root_dev_set_resources(device_t root)
+{
+	struct bus *bus;
+	bus = &root->link[0];
+	compute_allocate_resource(bus,
+		&root->resource[0], IORESOURCE_IO, IORESOURCE_IO);
+	compute_allocate_resource(bus, 
+		&root->resource[1], IORESOURCE_MEM, IORESOURCE_MEM);
+	assign_resources(bus);
+}
+
+/**
+ * Walk through devices on the motherboard and scan for devices behind
+ * them.
+ * @param root Pointer to the device structure for the system root device
+ * @param max  Maximum bus number allowed in the system.
+ * @return Largest bus number used.
+ */
+unsigned int walk_static_devices(device_t bus, unsigned int max)
+{
+	device_t child;
+	unsigned link;
+	for(link = 0; link < bus->links; link++) {
+		for(child = bus->link[link].children; child; child = child->sibling) {
+			if (child->ops && child->ops->enable) {
+				child->ops->enable(child);
+			}
+			printk_debug("%s %s\n",
+				dev_path(child),
+				child->enable?"enabled": "disabled");
+		}
+	}
+	for(link = 0; link < bus->links; link++) {
+		for(child = bus->link[link].children; child; child = child->sibling) {
+			if (!child->ops || !child->ops->scan_bus)
+				continue;
+			printk_debug("%s scanning...\n", dev_path(child));
+			max = child->ops->scan_bus(child, max);
+		}
+	}
+	return max;
+}
+
+void enable_childrens_resources(device_t dev)
+{
+	unsigned link;
+	for(link = 0; link < dev->links; link++) {
+		device_t child;
+		for(child = dev->link[link].children; child; child = child->sibling) {
+			enable_resources(child);
+		}
+	}
+}
+
+unsigned int root_dev_scan_pci_bus(device_t root, unsigned int max)
+{
+	return pci_scan_bus(&root->link[0], 0, 0xff, max);
+}
+
+struct device_operations default_dev_ops_root = {
+	.read_resources   = root_dev_read_resources,
+	.set_resources    = root_dev_set_resources,
+	.enable_resources = enable_childrens_resources,
+	.init             = 0,
+	.scan_bus         = root_dev_scan_pci_bus,
+};
+
+/**
+ * This is the root of the device tree. A PCI tree always has 
+ * one bus, bus 0. Bus 0 contains devices and bridges. 
+ */
+struct device dev_root = {
+	.ops = &default_dev_ops_root,
+	.bus = &dev_root.link[0],
+	.links = 1,
+	.link = {
+		[0] = {
+			.dev = &dev_root,
+			.link = 0,
+		},
+	},
+};
-- 
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