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#include <console/console.h>
#include <device/device.h>
#include <device/path.h>
#include <device/pci.h>
#include <string.h>
/**
* @brief See if a device structure already exists and if not allocate it
*
* @param bus The bus to find the device on
* @param path The relative path from the bus to the appropriate device
* @return pointer to a device structure for the device on bus at path
*/
device_t alloc_find_dev(struct bus *parent, struct device_path *path)
{
device_t child;
for (child = parent->children; child; child = child->sibling) {
if (path_eq(path, &child->path)) {
return child;
}
}
return alloc_dev(parent, path);
}
/**
* Given a bus and a devfn number, find the device structure
* @param bus The bus number
* @param devfn a device/function number
* @return pointer to the device structure
*/
struct device *dev_find_slot(unsigned int bus, unsigned int devfn)
{
struct device *dev, *result;
result = 0;
for (dev = all_devices; dev; dev = dev->next) {
if ((dev->path.type == DEVICE_PATH_PCI) &&
(dev->bus->secondary == bus) &&
(dev->path.u.pci.devfn == devfn)) {
result = dev;
break;
}
}
return result;
}
/** Find a device of a given vendor and type
* @param vendor Vendor ID (e.g. 0x8086 for Intel)
* @param device Device ID
* @param from Pointer to the device structure, used as a starting point
* in the linked list of all_devices, which can be 0 to start at the
* head of the list (i.e. all_devices)
* @return Pointer to the device struct
*/
struct device *dev_find_device(unsigned int vendor, unsigned int device, struct device *from)
{
if (!from)
from = all_devices;
else
from = from->next;
while (from && (from->vendor != vendor || from->device != device)) {
from = from->next;
}
return from;
}
/** Find a device of a given class
* @param class Class of the device
* @param from Pointer to the device structure, used as a starting point
* in the linked list of all_devices, which can be 0 to start at the
* head of the list (i.e. all_devices)
* @return Pointer to the device struct
*/
struct device *dev_find_class(unsigned int class, struct device *from)
{
if (!from)
from = all_devices;
else
from = from->next;
while (from && (from->class & 0xffffff00) != class)
from = from->next;
return from;
}
const char *dev_path(device_t dev)
{
static char buffer[DEVICE_PATH_MAX];
buffer[0] = '\0';
if (!dev) {
memcpy(buffer, "<null>", 7);
}
else {
switch(dev->path.type) {
case DEVICE_PATH_ROOT:
memcpy(buffer, "Root Device", 12);
break;
case DEVICE_PATH_PCI:
sprintf(buffer, "PCI: %02x:%02x.%01x",
dev->bus->secondary,
PCI_SLOT(dev->path.u.pci.devfn), PCI_FUNC(dev->path.u.pci.devfn));
break;
case DEVICE_PATH_PNP:
sprintf(buffer, "PNP: %04x.%01x",
dev->path.u.pnp.port, dev->path.u.pnp.device);
break;
case DEVICE_PATH_I2C:
sprintf(buffer, "I2C: %02x",
dev->path.u.i2c.device);
break;
default:
printk_err("Unknown device path type: %d\n", dev->path.type);
break;
}
}
return buffer;
}
int path_eq(struct device_path *path1, struct device_path *path2)
{
int equal = 0;
if (path1->type == path2->type) {
switch(path1->type) {
case DEVICE_PATH_NONE:
break;
case DEVICE_PATH_ROOT:
equal = 1;
break;
case DEVICE_PATH_PCI:
equal = (path1->u.pci.bus == path2->u.pci.bus) &&
(path1->u.pci.devfn == path2->u.pci.devfn);
break;
case DEVICE_PATH_PNP:
equal = (path1->u.pnp.port == path2->u.pnp.port) &&
(path1->u.pnp.device == path2->u.pnp.device);
break;
case DEVICE_PATH_I2C:
equal = (path1->u.i2c.device == path2->u.i2c.device);
break;
default:
printk_err("Uknown device type: %d\n", path1->type);
break;
}
}
return equal;
}
/**
* See if we have unused but allocated resource structures.
* If so remove the allocation.
* @param dev The device to find the resource on
*/
void compact_resources(device_t dev)
{
struct resource *resource;
int i;
/* Move all of the free resources to the end */
for(i = 0; i < dev->resources;) {
resource = &dev->resource[i];
if (!resource->flags) {
memmove(resource, resource + 1, dev->resources - i);
dev->resources -= 1;
memset(&dev->resource[dev->resources], 0, sizeof(*resource));
} else {
i++;
}
}
}
/**
* See if a resource structure already exists for a given index and if
* not allocate one.
* @param dev The device to find the resource on
* @param index The index of the resource on the device.
*/
struct resource *get_resource(device_t dev, unsigned index)
{
struct resource *resource;
int i;
/* First move all of the free resources to the end */
compact_resources(dev);
/* See if there is a resource with the appropriate index */
resource = 0;
for(i = 0; i < dev->resources; i++) {
if (dev->resource[i].index == index) {
resource = &dev->resource[i];
break;
}
}
if (!resource) {
if (dev->resources == MAX_RESOURCES) {
die("MAX_RESOURCES exceeded.");
}
resource = &dev->resource[dev->resources];
memset(resource, 0, sizeof(*resource));
dev->resources++;
}
/* Initialize the resource values */
if (!(resource->flags & IORESOURCE_FIXED)) {
resource->flags = 0;
resource->base = 0;
}
resource->size = 0;
resource->limit = 0;
resource->index = index;
resource->align = 0;
resource->gran = 0;
return resource;
}
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