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/* chips are arbitrary chips (superio, southbridge, etc.)
* They have private structures that define chip resources and default
* settings. They have four externally visible functions for control.
* They have a generic component which applies to all chips for
* path, etc.
*/
#include <console/console.h>
#include <device/chip.h>
#include <device/pci.h>
/**
* @brief Configure static devices
*
* Starting from the static device 'root', walk the tree and configure each
* device by calling the device specific chip_control::enable().
*
* This function is only an iterator, the exact definition of 'configure'
* depends on the device specific implementation of chip_control::enable().
*
* @param root root of the static device tree to be configured.
* @param pass pass of the configuration operation to be perfromed.
*
* @see chip_pass
* @see chip_control::enable
*/
void chip_configure(struct chip *root, enum chip_pass pass)
{
struct chip *c;
for (c = root; c; c = c->next) {
if (c->control && c->control->enable)
c->control->enable(c, pass);
}
for (c = root; c; c = c->next) {
if (c->children)
chip_configure(c->children, pass);
}
}
/**
* @brief Convert static device structures to dynamic structures.
*
* A static device may contain one or more dynamic devices. Dynamic device
* structures of these devices have to be generated before the enumeration
* of dynamic devices. This function converts a static chip structure to a
* set of dynamic device structures.
*
* This function is the generic method called by enumerate_static_device_chain()
* for static devices. Devices extend this default behavior by defining their
* own chip_controll::enumerate(). Generally, device specific
* chip_control::enumerate() method calls this function as its last operation.
*
* @param chip static chip structure to be converted.
*
*/
void chip_enumerate(struct chip *chip)
{
struct chip *child;
device_t dev;
int link;
int i;
dev = 0;
link = 0;
if (chip->control && chip->control->name) {
printk_debug("Enumerating: %s\n", chip->control->name);
}
for (i = 0; i < MAX_CHIP_PATHS; i++) {
int identical_paths;
identical_paths =
(i > 0) &&
(path_eq(&chip->path[i - 1].path, &chip->path[i].path));
if (!identical_paths) {
struct bus *parent;
int bus;
link = 0;
dev = 0;
parent = chip->bus;
switch(chip->path[i].path.type) {
case DEVICE_PATH_NONE:
/* no dynamic device associated */
break;
case DEVICE_PATH_PCI:
bus = chip->path[i].path.u.pci.bus;
if (bus != 0) {
device_t dev;
int i = 1;
dev = chip->dev;
while (dev && (i != bus)) {
dev = dev->next;
i++;
}
if ((i == bus) && dev) {
parent = &dev->link[0];
}
}
/* Fall through */
default:
dev = alloc_dev(parent, &chip->path[i].path);
break;
}
} else {
link += 1;
}
if (dev) {
struct chip_resource *res, *res_limit;
printk_spew("path (%p) %s %s",
dev, dev_path(dev),
identical_paths?"identical":"");
printk_spew(" parent: (%p) %s\n",
dev->bus->dev, dev_path(dev->bus->dev));
dev->chip = chip;
dev->enabled = chip->path[i].enabled;
dev->links = link + 1;
for (child = chip->children; child; child = child->next) {
if (!child->bus && child->link == i) {
child->bus = &dev->link[link];
}
}
res = &chip->path[i].resource[0];
res_limit = &chip->path[i].resource[MAX_RESOURCES];
for(; res < res_limit; res++) {
if (res->flags) {
struct resource *resource;
resource = get_resource(dev, res->index);
resource->flags = res->flags | IORESOURCE_FIXED | IORESOURCE_ASSIGNED;
resource->base = res->base;
}
}
}
if (dev && !chip->dev) {
chip->dev = dev;
}
}
for (child = chip->children; child; child = child->next) {
if (!child->bus) {
child->bus = &chip->dev->link[0];
}
}
}
/**
* @brief Enumerate a static device tree.
*
* A static device chain is a linked list of static device structures which are
* on the same branch of the static device tree. This function does not only
* enumerate the devices on a single chain, as its name suggest, it also walks
* into the subordinary chains by recursion. It calls the device specific
* chip_control::enumerate() of the device if one exists or calls the generic
* chip_enumerate().
*
* This function is only an iterator, the exact definition of 'enumerate'
* depends on the implementation of the generic chip_enumerate() and/or device
* specific chip_control::enumerate().
*
* @param root static chip structure to start with.
*
* @see chip_control::enumerate()
*/
static void enumerate_static_device_chain(struct chip *root)
{
struct chip *chip;
for (chip = root; chip; chip = chip->next) {
void (*enumerate)(struct chip *chip);
enumerate = chip_enumerate;
if (chip->control && chip->control->enumerate) {
enumerate = chip->control->enumerate;
}
enumerate(chip);
}
for (chip = root; chip; chip = chip->next) {
if (chip->children) {
enumerate_static_device_chain(chip->children);
}
}
}
/**
* @brief Enumerate static devices in the system.
*
* Static device is . Static devices are actually enumerated or "listed" in
* the Config.lb config file and the corresponding data structures are
* generated by config tool in the static.c.
*
* \note The definition of 'enumerate' is not clear in this context. Does it
* mean probe ?
*
* \note How do we determine the existence of the static devices ? Static
* devices are listed in the config file and generated at compile time by config
* tool. This function is called at certain point in the early stage of
* LinuxBIOS. It uses the chip_enumerate() function to convert the static
* structures into dynamic ones. What if the static devices listed in the config
* file does actually not exist in the system ? Is there any side effect of
* these 'phantom' device structures
*
* The static device does not necesarry conform to the dynamic device tree in
* the system.
*/
void enumerate_static_devices(void)
{
printk_info("Enumerating static devices...\n");
enumerate_static_device_chain(&static_root);
}
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