#include <arch/io.h>
#include <device/device.h>
#include <device/pci.h>
+#include <device/pci_ids.h>
#include <stdlib.h>
#include <string.h>
+#include <smp/spinlock.h>
-/* Linked list of ALL devices */
+/** 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;
-
-#define DEVICE_MEM_HIGH 0xFEC00000UL /* Reserve 20M for the system */
+/** Pointer to the last device */
+extern struct device **last_dev_p;
+
+/** The upper limit of MEM resource of the devices.
+ * Reserve 20M for the system */
+#define DEVICE_MEM_HIGH 0xFEBFFFFFUL
+/** The lower limit of IO resource of the devices.
+ * Reserve 4k for ISA/Legacy devices */
#define DEVICE_IO_START 0x1000
-/** Allocate a new device structure
+/**
+ * @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
*/
+static spinlock_t dev_lock = SPIN_LOCK_UNLOCKED;
device_t alloc_dev(struct bus *parent, struct device_path *path)
{
device_t dev, child;
int link;
+
+ spin_lock(&dev_lock);
/* Find the last child of our parent */
for(child = parent->children; child && child->sibling; ) {
child = child->sibling;
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.
- */
- *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;
}
+
+ /* By default devices are enabled */
+ dev->enabled = 1;
- /* Add the new device to the children of the bus. */
+ /* Add the new device to the list of 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->enable = 1;
+
+ /* 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;
+
+ spin_unlock(&dev_lock);
return dev;
}
-/** round a number to an alignment.
+/**
+ * @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
*/
-static unsigned long round(unsigned long val, unsigned long roundup)
-{
- /* ROUNDUP MUST BE A POWER OF TWO. */
- unsigned long inverse;
- inverse = ~(roundup - 1);
- val += (roundup - 1);
- val &= inverse;
- return val;
-}
-
-static unsigned long round_down(unsigned long val, unsigned long round_down)
+static resource_t round(resource_t val, unsigned long pow)
{
- /* ROUND_DOWN MUST BE A POWER OF TWO. */
- unsigned long inverse;
- inverse = ~(round_down - 1);
- val &= inverse;
+ resource_t mask;
+ mask = (1ULL << pow) - 1ULL;
+ val += mask;
+ val &= ~mask;
return val;
}
-
/** Read the resources on all devices of a given bus.
* @param bus bus to read the resources on.
*/
{
struct device *curdev;
+ printk_spew("%s read_resources bus %d link: %d\n",
+ dev_path(bus->dev), bus->secondary, bus->link);
+
/* Walk through all of the devices and find which resources they need. */
for(curdev = bus->children; curdev; curdev = curdev->sibling) {
unsigned links;
int i;
- if (curdev->resources > 0) {
+ if (curdev->have_resources) {
+ continue;
+ }
+ if (!curdev->enabled) {
continue;
}
if (!curdev->ops || !curdev->ops->read_resources) {
dev_path(curdev));
continue;
}
- if (!curdev->enable) {
- continue;
- }
curdev->ops->read_resources(curdev);
+ curdev->have_resources = 1;
/* Read in subtractive resources behind the current device */
links = 0;
for(i = 0; i < curdev->resources; i++) {
struct resource *resource;
+ unsigned link;
resource = &curdev->resource[i];
- if ((resource->flags & IORESOURCE_SUBTRACTIVE) &&
- (!(links & (1 << resource->index))))
- {
- links |= (1 << resource->index);
+ if (!(resource->flags & IORESOURCE_SUBTRACTIVE))
+ continue;
+ link = IOINDEX_SUBTRACTIVE_LINK(resource->index);
+ if (link > MAX_LINKS) {
+ printk_err("%s subtractive index on link: %d\n",
+ dev_path(curdev), link);
+ continue;
+ }
+ if (!(links & (1 << link))) {
+ links |= (1 << link);
read_resources(&curdev->link[resource->index]);
}
}
}
+ printk_spew("%s read_resources bus %d link: %d done\n",
+ dev_path(bus->dev), bus->secondary, bus->link);
}
struct pick_largest_state {
int seen_last;
};
-static void pick_largest_resource(
- struct pick_largest_state *state, struct device *dev, struct resource *resource)
+static void pick_largest_resource(struct pick_largest_state *state,
+ struct device *dev, struct resource *resource)
{
struct resource *last;
last = state->last;
(state->result->size < resource->size))) {
state->result_dev = dev;
state->result = resource;
- }
-
+ }
}
static void find_largest_resource(struct pick_largest_state *state,
struct device *curdev;
for(curdev = bus->children; curdev; curdev = curdev->sibling) {
int i;
+ /* Ignore disabled devices */
+ if (!curdev->have_resources) continue;
for(i = 0; i < curdev->resources; i++) {
struct resource *resource = &curdev->resource[i];
/* If it isn't the right kind of resource ignore it */
{
struct device *dev;
struct resource *resource;
- unsigned long base;
+ resource_t base;
unsigned long align, min_align;
min_align = 0;
base = bridge->base;
/* Remember I haven't found anything yet. */
resource = 0;
- /* Walk through all the devices on the current bus and compute the addresses */
+ /* 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;
+ resource_t 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
* return them. Some resources must be set even when they have
if (resource->flags & IORESOURCE_FIXED) {
continue;
}
+ /* Propogate the resource limit to the bridge register */
+ if (bridge->limit > resource->limit) {
+ bridge->limit = resource->limit;
+ }
+ /* Artificially deny limits between DEVICE_MEM_HIGH and 0xffffffff */
+ if ((bridge->limit > DEVICE_MEM_HIGH) && (bridge->limit <= 0xffffffff)) {
+ bridge->limit = DEVICE_MEM_HIGH;
+ }
if (resource->flags & IORESOURCE_IO) {
/* Don't allow potential aliases over the
* legacy pci expansion card addresses.
base = 0x3e0;
}
}
- if (((round(base, 1UL << align) + size) -1) <= resource->limit) {
+ if (((round(base, align) + size) -1) <= resource->limit) {
/* base must be aligned to size */
- base = round(base, 1UL << align);
+ base = round(base, align);
resource->base = base;
resource->flags |= IORESOURCE_ASSIGNED;
resource->flags &= ~IORESOURCE_STORED;
base += size;
printk_spew(
- "%s %02x * [0x%08lx - 0x%08lx] %s\n",
+ "%s %02x * [0x%08Lx - 0x%08Lx] %s\n",
dev_path(dev),
resource->index,
- resource->base, resource->base + resource->size -1,
+ 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.
* know not to place something else at an address postitively
* decoded by the bridge.
*/
- bridge->size = round(base, 1UL << bridge->gran) - bridge->base;
+ bridge->size = round(base, bridge->gran) - bridge->base;
printk_spew("%s compute_allocate_%s: base: %08lx size: %08lx align: %d gran: %d done\n",
- dev_path(dev),
+ dev_path(bus->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;
struct bus *bus;
bus = 0;
vga = 0;
for(dev = all_devices; dev; dev = dev->next) {
- if (((dev->class >> 16) == 0x03) &&
- ((dev->class >> 8) != 0x380)) {
+ if (((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) &&
+ ((dev->class >> 8) != PCI_CLASS_DISPLAY_OTHER))
+ {
if (!vga) {
- printk_debug("Allocating VGA resource\n");
+ printk_debug("Allocating VGA resource %s\n",
+ dev_path(dev));
vga = dev;
}
if (vga == dev) {
/** 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 bus *bus)
{
struct device *curdev;
- printk_debug("ASSIGN RESOURCES, bus %d\n", bus->secondary);
+ printk_spew("%s assign_resources, bus %d link: %d\n",
+ dev_path(bus->dev), bus->secondary, bus->link);
- for (curdev = bus->children; curdev; curdev = curdev->sibling) {
+ for(curdev = bus->children; curdev; curdev = curdev->sibling) {
+ if (!curdev->enabled || !curdev->resources) {
+ continue;
+ }
if (!curdev->ops || !curdev->ops->set_resources) {
printk_err("%s missing set_resources\n",
dev_path(curdev));
continue;
}
- if (!curdev->enable) {
- continue;
- }
curdev->ops->set_resources(curdev);
}
- printk_debug("ASSIGNED RESOURCES, bus %d\n", bus->secondary);
+ printk_spew("%s assign_resources, bus %d link: %d\n",
+ dev_path(bus->dev), bus->secondary, bus->link);
}
+/**
+ * @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 that method to call it's children's enable_resoruces() via
+ * enable_childrens_resources().
+ *
+ * Indirect mutual recursion:
+ */
void enable_resources(struct device *dev)
{
- /* Enable the resources for a specific device.
- * The parents resources should be enabled first to avoid
- * having enabling ordering problems.
- */
- if (!dev->ops || !dev->ops->enable_resources) {
- printk_err("%s missing enable_resources\n",
- dev_path(dev));
+ if (!dev->enabled) {
return;
}
- if (!dev->enable) {
+ if (!dev->ops || !dev->ops->enable_resources) {
+ printk_err("%s missing enable_resources\n", dev_path(dev));
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 from 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 has to create the device structure and attach
+ * it to the device tree.
*/
void dev_enumerate(void)
{
struct device *root;
unsigned subordinate;
- printk_info("Enumerating buses...");
+ printk_info("Enumerating buses...\n");
root = &dev_root;
+ if (root->chip_ops && root->chip_ops->enable_dev) {
+ root->chip_ops->enable_dev(root);
+ }
+ if (!root->ops || !root->ops->scan_bus) {
+ printk_err("dev_root missing scan_bus operation");
+ return;
+ }
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,
+ * and 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");
+ struct resource *io, *mem;
+ struct device *root;
+ printk_info("Allocating resources...\n");
+ root = &dev_root;
+ if (!root->ops || !root->ops->read_resources) {
+ printk_err("dev_root missing read_resources\n");
+ return;
+ }
+ if (!root->ops || !root->ops->set_resources) {
+ printk_err("dev_root missing set_resources\n");
+ return;
+ }
root->ops->read_resources(root);
- /* Make certain the io devices are allocated somewhere
- * safe.
- */
- root->resource[0].base = DEVICE_IO_START;
- root->resource[0].flags |= IORESOURCE_ASSIGNED;
- root->resource[0].flags &= ~IORESOURCE_STORED;
+ /* Get the resources */
+ io = &root->resource[0];
+ mem = &root->resource[1];
+ /* Make certain the io devices are allocated somewhere safe. */
+ io->base = DEVICE_IO_START;
+ io->flags |= IORESOURCE_ASSIGNED;
+ io->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);
- root->resource[1].flags |= IORESOURCE_ASSIGNED;
- root->resource[1].flags &= ~IORESOURCE_STORED;
+ mem->base = resource_max(&root->resource[1]);
+ mem->flags |= IORESOURCE_ASSIGNED;
+ mem->flags &= ~IORESOURCE_STORED;
- /* Allocate the VGA I/O resource..
- */
+ /* Allocate the VGA I/O resource.. */
allocate_vga_resource();
- // now just set things into registers ... we hope ...
+ /* Store the computed resource allocations into device registers ... */
root->ops->set_resources(root);
+#if 0
+ mem->flags |= IORESOURCE_STORED;
+ report_resource_stored(root, mem, "");
+#endif
+
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)
{
/* 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->enable && dev->ops && dev->ops->init) {
+ for(dev = all_devices; dev; dev = dev->next) {
+ if (dev->enabled && !dev->initialized &&
+ dev->ops && dev->ops->init)
+ {
printk_debug("%s init\n", dev_path(dev));
+ dev->initialized = 1;
dev->ops->init(dev);
}
}
printk_info("Devices initialized\n");
}
+
projects / coreboot.git / blobdiff