/*
* (c) 1999--2000 Martin Mares <mj@suse.cz>
* (c) 2003 Eric Biederman <ebiederm@xmission.com>
+ * (c) 2003 Linux Networx
*/
/* lots of mods by ron minnich (rminnich@lanl.gov), with
* the final architecture guidance from Tom Merritt (tjm@codegen.com)
#include <console/console.h>
#include <bitops.h>
-#include <device.h>
#include <arch/io.h>
-#include <pci.h>
+#include <device/device.h>
+#include <device/pci.h>
+#include <stdlib.h>
+#include <string.h>
+
+/** Linked list of ALL devices */
+struct device *all_devices = &dev_root;
+/** Pointer to the last device */
+static struct device **last_dev_p = &dev_root.next;
+
+/** The upper limit of MEM resource of the devices.
+ * Reserve 20M for the system */
+#define DEVICE_MEM_HIGH 0xFEC00000UL
+/** The lower limit of IO resource of the devices.
+ * Reserve 4k for ISA/Legacy devices */
+#define DEVICE_IO_START 0x1000
/**
- * This is the root of the device tree. A PCI tree always has
- * one bus, bus 0. Bus 0 contains devices and bridges.
+ * @brief Allocate a new device structure.
+ *
+ * Allocte a new device structure and attached it to the device tree as a child
+ * of the parent bus.
+ *
+ * @param parent parent bus the newly created device attached to.
+ * @param path path to the device to be created.
+ *
+ * @return pointer to the newly created device structure.
+ *
+ * @see device_path
*/
-struct device dev_root;
-/* Linked list of ALL devices */
-struct device *all_devices = 0;
-/* pointer to the last device */
-static struct device **last_dev_p = &all_devices;
-
-#define DEVICE_MEM_HIGH 0xFEC00000UL /* Reserve 20M for the system */
-#define DEVICE_IO_START 0x1000
-
+device_t alloc_dev(struct bus *parent, struct device_path *path)
+{
+ device_t dev, child;
+ int link;
-unsigned long device_memory_base;
+ /* Find the last child of our parent */
+ for (child = parent->children; child && child->sibling; ) {
+ child = child->sibling;
+ }
+ dev = malloc(sizeof(*dev));
+ if (dev == 0) {
+ die("DEV: out of memory.\n");
+ }
+ memset(dev, 0, sizeof(*dev));
+ memcpy(&dev->path, path, sizeof(*path));
-/* Append a new device to the global device chain.
- * The chain is used to find devices once everything is set up.
- */
-void append_device(struct device *dev)
-{
+ /* Append a new device to the global device list.
+ * The list is used to find devices once everything is set up.
+ */
*last_dev_p = dev;
last_dev_p = &dev->next;
-}
+ /* Initialize the back pointers in the link fields */
+ for (link = 0; link < MAX_LINKS; link++) {
+ dev->link[link].dev = dev;
+ dev->link[link].link = link;
+ }
+
+ /* Add the new device to the children of the bus. */
+ dev->bus = parent;
+ if (child) {
+ child->sibling = dev;
+ } else {
+ parent->children = dev;
+ }
+
+ /* If we don't have any other information about a device enable it */
+ dev->enabled = 1;
-/** round a number to an alignment.
+ return dev;
+}
+
+/**
+ * @brief round a number up to an alignment.
* @param val the starting value
* @param roundup Alignment as a power of two
* @returns rounded up number
/** Read the resources on all devices of a given bus.
* @param bus bus to read the resources on.
*/
-static void read_resources(struct device *bus)
+static void read_resources(struct bus *bus)
{
struct device *curdev;
-
/* Walk through all of the devices and find which resources they need. */
- for(curdev = bus->children; curdev; curdev = curdev->sibling) {
+ for (curdev = bus->children; curdev; curdev = curdev->sibling) {
+ unsigned links;
+ int i;
if (curdev->resources > 0) {
continue;
}
+ if (!curdev->ops || !curdev->ops->read_resources) {
+ printk_err("%s missing read_resources\n",
+ dev_path(curdev));
+ continue;
+ }
+ if (!curdev->enabled) {
+ continue;
+ }
+
curdev->ops->read_resources(curdev);
+
+ /* Read in subtractive resources behind the current device */
+ links = 0;
+ for (i = 0; i < curdev->resources; i++) {
+ struct resource *resource;
+ resource = &curdev->resource[i];
+ if ((resource->flags & IORESOURCE_SUBTRACTIVE) &&
+ (!(links & (1 << resource->index))))
+ {
+ links |= (1 << resource->index);
+ read_resources(&curdev->link[resource->index]);
+
+ }
+ }
+ }
+}
+
+struct pick_largest_state {
+ struct resource *last;
+ struct device *result_dev;
+ struct resource *result;
+ int seen_last;
+};
+
+static void pick_largest_resource(struct pick_largest_state *state,
+ struct device *dev, struct resource *resource)
+{
+ struct resource *last;
+ last = state->last;
+ /* Be certain to pick the successor to last */
+ if (resource == last) {
+ state->seen_last = 1;
+ return;
}
+ if (last &&
+ ((last->align < resource->align) ||
+ ((last->align == resource->align) &&
+ (last->size < resource->size)) ||
+ ((last->align == resource->align) &&
+ (last->size == resource->size) &&
+ (!state->seen_last)))) {
+ return;
+ }
+ if (!state->result ||
+ (state->result->align < resource->align) ||
+ ((state->result->align == resource->align) &&
+ (state->result->size < resource->size))) {
+ state->result_dev = dev;
+ state->result = resource;
+ }
}
-static struct device *largest_resource(struct device *bus, struct resource **result_res,
- unsigned long type_mask, unsigned long type)
+static void find_largest_resource(struct pick_largest_state *state,
+ struct bus *bus, unsigned long type_mask,
+ unsigned long type)
{
struct device *curdev;
- struct device *result_dev = 0;
- struct resource *last = *result_res;
- struct resource *result = 0;
- int seen_last = 0;
- for(curdev = bus->children; curdev; curdev = curdev->sibling) {
+
+ for (curdev = bus->children; curdev; curdev = curdev->sibling) {
int i;
- for(i = 0; i < curdev->resources; i++) {
+ for (i = 0; i < curdev->resources; i++) {
struct resource *resource = &curdev->resource[i];
/* If it isn't the right kind of resource ignore it */
if ((resource->flags & type_mask) != type) {
continue;
}
- /* Be certain to pick the successor to last */
- if (resource == last) {
- seen_last = 1;
+ /* If it is a subtractive resource recurse */
+ if (resource->flags & IORESOURCE_SUBTRACTIVE) {
+ struct bus *subbus;
+ subbus = &curdev->link[resource->index];
+ find_largest_resource(state, subbus,
+ type_mask, type);
continue;
}
- if (last && (
- (last->align < resource->align) ||
- ((last->align == resource->align) &&
- (last->size < resource->size)) ||
- ((last->align == resource->align) &&
- (last->size == resource->size) &&
- (!seen_last)))) {
- continue;
- }
- if (!result ||
- (result->align < resource->align) ||
- ((result->align == resource->align) &&
- (result->size < resource->size))) {
- result_dev = curdev;
- result = resource;
- }
+ /* See if this is the largest resource */
+ pick_largest_resource(state, curdev, resource);
}
}
- *result_res = result;
- return result_dev;
+}
+
+static struct device *largest_resource(struct bus *bus,
+ struct resource **result_res,
+ unsigned long type_mask,
+ unsigned long type)
+{
+ struct pick_largest_state state;
+
+ state.last = *result_res;
+ state.result_dev = 0;
+ state.result = 0;
+ state.seen_last = 0;
+
+ find_largest_resource(&state, bus, type_mask, type);
+
+ *result_res = state.result;
+ return state.result_dev;
}
/* Compute allocate resources is the guts of the resource allocator.
*/
void compute_allocate_resource(
- struct device *bus,
+ struct bus *bus,
struct resource *bridge,
unsigned long type_mask,
unsigned long type)
min_align = 0;
base = bridge->base;
+ printk_spew("%s compute_allocate_%s: base: %08lx size: %08lx "
+ "align: %d gran: %d\n",
+ dev_path(bus->dev),
+ (bridge->flags & IORESOURCE_IO)? "io":
+ (bridge->flags & IORESOURCE_PREFETCH)? "prefmem" : "mem",
+ base, bridge->size, bridge->align, bridge->gran);
+
/* We want different minimum alignments for different kinds of
* resources. These minimums are not device type specific
* but resource type specific.
min_align = log2(DEVICE_MEM_ALIGN);
}
- printk_spew("DEV: %02x:%02x.%01x compute_allocate_%s: base: %08lx size: %08lx align: %d gran: %d\n",
- bus->bus->secondary,
- PCI_SLOT(bus->devfn), PCI_FUNC(bus->devfn),
- (bridge->flags & IORESOURCE_IO)? "io":
- (bridge->flags & IORESOURCE_PREFETCH)? "prefmem" : "mem",
- base, bridge->size, bridge->align, bridge->gran);
-
/* Make certain I have read in all of the resources */
read_resources(bus);
/* Remember I haven't found anything yet. */
resource = 0;
- /* Walk through all the devices on the current bus and compute the addresses */
- while((dev = largest_resource(bus, &resource, type_mask, type))) {
+ /* Walk through all the devices on the current bus and compute the
+ * addresses */
+ while ((dev = largest_resource(bus, &resource, type_mask, type))) {
unsigned long size;
/* Do NOT I repeat do not ignore resources which have zero size.
* If they need to be ignored dev->read_resources should not even
if (align < min_align) {
align = min_align;
}
+ if (resource->flags & IORESOURCE_FIXED) {
+ continue;
+ }
if (resource->flags & IORESOURCE_IO) {
/* Don't allow potential aliases over the
* legacy pci expansion card addresses.
+ * The legacy pci decodes only 10 bits,
+ * uses 100h - 3ffh. Therefor, only 0 - ff
+ * can be used out of each 400h block of io
+ * space.
*/
- if ((base > 0x3ff) && ((base & 0x300) != 0)) {
+ if ((base & 0x300) != 0) {
base = (base & ~0x3ff) + 0x400;
}
/* Don't allow allocations in the VGA IO range.
/* base must be aligned to size */
base = round(base, 1UL << align);
resource->base = base;
- resource->flags |= IORESOURCE_SET;
+ resource->flags |= IORESOURCE_ASSIGNED;
+ resource->flags &= ~IORESOURCE_STORED;
base += size;
- printk_spew(
- "DEV: %02x:%02x.%01x %02x * [0x%08lx - 0x%08lx] %s\n",
- dev->bus->secondary,
- PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn),
- resource->index,
- resource->base, resource->base + resource->size -1,
- (resource->flags & IORESOURCE_IO)? "io":
- (resource->flags & IORESOURCE_PREFETCH)? "prefmem": "mem");
+ printk_spew("%s %02x * [0x%08lx - 0x%08lx] %s\n",
+ dev_path(dev),
+ resource->index, resource->base,
+ resource->base + resource->size - 1,
+ (resource->flags & IORESOURCE_IO)? "io":
+ (resource->flags & IORESOURCE_PREFETCH)? "prefmem": "mem");
}
-
}
/* A pci bridge resource does not need to be a power
* of two size, but it does have a minimum granularity.
*/
bridge->size = round(base, 1UL << bridge->gran) - bridge->base;
- printk_spew("DEV: %02x:%02x.%01x compute_allocate_%s: base: %08lx size: %08lx align: %d gran: %d done\n",
- bus->bus->secondary,
- PCI_SLOT(bus->devfn), PCI_FUNC(bus->devfn),
- (bridge->flags & IORESOURCE_IO)? "io":
- (bridge->flags & IORESOURCE_PREFETCH)? "prefmem" : "mem",
- base, bridge->size, bridge->align, bridge->gran);
+ printk_spew("%s compute_allocate_%s: base: %08lx size: %08lx align: %d gran: %d done\n",
+ dev_path(dev),
+ (bridge->flags & IORESOURCE_IO)? "io":
+ (bridge->flags & IORESOURCE_PREFETCH)? "prefmem" : "mem",
+ base, bridge->size, bridge->align, bridge->gran);
}
static void allocate_vga_resource(void)
{
+#warning "FIXME modify allocate_vga_resource so it is less pci centric!"
+#warning "This function knows to much about PCI stuff, it should be just a ietrator/visitor."
+
/* FIXME handle the VGA pallette snooping */
- struct device *dev, *vga, *bus;
- bus = vga = 0;
+ struct device *dev, *vga;
+ struct bus *bus;
+ bus = 0;
+ vga = 0;
for(dev = all_devices; dev; dev = dev->next) {
- uint32_t class_revision;
- pci_read_config_dword(dev, PCI_CLASS_REVISION, &class_revision);
- if (((class_revision >> 24) == 0x03) &&
- ((class_revision >> 16) != 0x380)) {
+ if (((dev->class >> 16) == 0x03) &&
+ ((dev->class >> 8) != 0x380)) {
if (!vga) {
printk_debug("Allocating VGA resource\n");
vga = dev;
}
/* Now walk up the bridges setting the VGA enable */
while(bus) {
- uint16_t ctrl;
- pci_read_config_word(bus, PCI_BRIDGE_CONTROL, &ctrl);
- ctrl |= PCI_BRIDGE_CTL_VGA;
- pci_write_config_word(bus, PCI_BRIDGE_CONTROL, ctrl);
- bus = (bus == bus->bus)? 0 : bus->bus;
+ bus->bridge_ctrl |= PCI_BRIDGE_CTL_VGA;
+ bus = (bus == bus->dev->bus)? 0 : bus->dev->bus;
}
}
/** Assign the computed resources to the bridges and devices on the bus.
* Recurse to any bridges found on this bus first. Then do the devices
- * on this bus.
+ * on this bus.
+ *
* @param bus Pointer to the structure for this bus
*/
-void assign_resources(struct device *bus)
+void assign_resources(struct bus *bus)
{
struct device *curdev;
printk_debug("ASSIGN RESOURCES, bus %d\n", bus->secondary);
for (curdev = bus->children; curdev; curdev = curdev->sibling) {
+ if (!curdev->ops || !curdev->ops->set_resources) {
+ printk_err("%s missing set_resources\n",
+ dev_path(curdev));
+ continue;
+ }
+ if (!curdev->enabled) {
+ continue;
+ }
curdev->ops->set_resources(curdev);
}
printk_debug("ASSIGNED RESOURCES, bus %d\n", bus->secondary);
}
-static void enable_resources(struct device *bus)
+/**
+ * @brief Enable the resources for a specific device
+ *
+ * @param dev the device whose resources are to be enabled
+ *
+ * Enable resources of the device by calling the device specific
+ * enable_resources() method.
+ *
+ * The parent's resources should be enabled first to avoid having enabling
+ * order problem. This is done by calling the parent's enable_resources()
+ * method and let the method to call it's children's enable_resoruces() via
+ * enable_childrens_resources().
+ */
+void enable_resources(struct device *dev)
{
- struct device *curdev;
-
- /* Walk through the chain of all pci devices and enable them.
- * This is effectively a breadth first traversal so we should
- * not have enalbing ordering problems.
- */
- for (curdev = all_devices; curdev; curdev = curdev->next) {
- uint16_t command;
- pci_read_config_word(curdev, PCI_COMMAND, &command);
- command |= curdev->command;
- printk_debug("DEV: %02x:%02x.%01x cmd <- %02x\n",
- curdev->bus->secondary,
- PCI_SLOT(curdev->devfn), PCI_FUNC(curdev->devfn),
- command);
- pci_write_config_word(curdev, PCI_COMMAND, command);
+ if (!dev->ops || !dev->ops->enable_resources) {
+ printk_err("%s missing enable_resources\n", dev_path(dev));
+ return;
+ }
+ if (!dev->enabled) {
+ return;
}
+ dev->ops->enable_resources(dev);
}
-/** Enumerate the resources on the PCI by calling pci_init
+/**
+ * @brief Determine the existence of dynamic devices and construct dynamic
+ * device tree.
+ *
+ * Start form the root device 'dev_root', scan the buses in the system
+ * recursively, build the dynamic device tree according to the result
+ * of the probe.
+ *
+ * This function has no idea how to scan and probe buses and devices at all.
+ * It depends on the bus/device specific scan_bus() method to do it. The
+ * scan_bus() function also have to create the device structure and attach
+ * it to the device tree.
*/
void dev_enumerate(void)
{
struct device *root;
- printk_info("Enumerating buses...");
+ unsigned subordinate;
+
+ printk_info("Enumerating buses...\n");
+
root = &dev_root;
- if (!root->ops) {
- root->ops = &default_pci_ops_root;
- }
- root->subordinate = root->ops->scan_bus(root, 0);
+ subordinate = root->ops->scan_bus(root, 0);
+
printk_info("done\n");
}
-/** Starting at the root, compute what resources are needed and allocate them.
- * I/O starts at PCI_IO_START. Since the assignment is hierarchical we
- * set the values into the dev_root struct.
+/**
+ * @brief Configure devices on the devices tree.
+ *
+ * Starting at the root of the dynamic device tree, travel recursively,
+ * compute resources needed by each device and allocate them.
+ *
+ * I/O resources start at DEVICE_IO_START and grow upward. MEM resources start
+ * at DEVICE_MEM_START and grow downward.
+ *
+ * Since the assignment is hierarchical we set the values into the dev_root
+ * struct.
*/
void dev_configure(void)
{
struct device *root = &dev_root;
+
printk_info("Allocating resources...");
printk_debug("\n");
-
root->ops->read_resources(root);
- /* Make certain the io devices are allocated somewhere
- * safe.
- */
+ /* Make certain the io devices are allocated somewhere safe. */
root->resource[0].base = DEVICE_IO_START;
- root->resource[0].flags |= IORESOURCE_SET;
- /* Now reallocate the pci resources memory with the
- * highest addresses I can manage.
- */
+ root->resource[0].flags |= IORESOURCE_ASSIGNED;
+ root->resource[0].flags &= ~IORESOURCE_STORED;
+
+ /* Now reallocate the pci resources memory with the highest
+ * addresses I can manage.*/
root->resource[1].base =
round_down(DEVICE_MEM_HIGH - root->resource[1].size,
- 1UL << root->resource[1].align);
- device_memory_base = root->resource[1].base;
- root->resource[1].flags |= IORESOURCE_SET;
- // now just set things into registers ... we hope ...
- root->ops->set_resources(root);
+ 1UL << root->resource[1].align);
+ root->resource[1].flags |= IORESOURCE_ASSIGNED;
+ root->resource[1].flags &= ~IORESOURCE_STORED;
+
+ /* Allocate the VGA I/O resource.. */
+ allocate_vga_resource();
- allocate_vga_resource();
+ /* now just set things into registers ... we hope ... */
+ root->ops->set_resources(root);
printk_info("done.\n");
}
-/** Starting at the root, walk the tree and enable all devices/bridges.
- * What really happens is computed COMMAND bits get set in register 4
+/**
+ * @brief Enable devices on the device tree.
+ *
+ * Starting at the root, walk the tree and enable all devices/bridges by
+ * calling the device's enable_resources() method.
*/
void dev_enable(void)
{
- printk_info("Enabling resourcess...");
+ printk_info("Enabling resourcess...\n");
/* now enable everything. */
enable_resources(&dev_root);
+
printk_info("done.\n");
}
-/** Starting at the root, walk the tree and call a driver to
- * do device specific setup.
+/**
+ * @brief Initialize all devices in the global device list.
+ *
+ * Starting at the first device on the global device link list,
+ * walk the list and call a driver to do device specific setup.
*/
void dev_initialize(void)
{
struct device *dev;
printk_info("Initializing devices...\n");
+
for (dev = all_devices; dev; dev = dev->next) {
- if (dev->ops->init) {
- printk_debug("PCI: %02x:%02x.%01x init\n",
- dev->bus->secondary,
- PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
+ if (dev->enabled && dev->ops && dev->ops->init) {
+ printk_debug("%s init\n", dev_path(dev));
dev->ops->init(dev);
}
}
+
printk_info("Devices initialized\n");
}
-
-
projects / coreboot.git / blobdiff