| #include <console/console.h> |
| #include <device/device.h> |
| #include <device/pci.h> |
| #include <part/hard_reset.h> |
| |
| /** |
| * Read the resources for the root device, |
| * that encompass 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) |
| { |
| struct resource *resource; |
| |
| /* Initialize the system wide io space constraints */ |
| resource = new_resource(root, 0); |
| resource->base = 0x400; |
| resource->size = 0; |
| resource->align = 0; |
| resource->gran = 0; |
| resource->limit = 0xffffUL; |
| resource->flags = IORESOURCE_IO; |
| compute_allocate_resource(&root->link[0], resource, |
| IORESOURCE_IO, IORESOURCE_IO); |
| |
| /* Initialize the system wide memory resources constraints */ |
| resource = new_resource(root, 1); |
| resource->base = 0; |
| resource->size = 0; |
| resource->align = 0; |
| resource->gran = 0; |
| resource->limit = 0xffffffffUL; |
| resource->flags = IORESOURCE_MEM; |
| compute_allocate_resource(&root->link[0], resource, |
| IORESOURCE_MEM, IORESOURCE_MEM); |
| } |
| |
| /** |
| * @brief Write the resources for every device |
| * |
| * 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); |
| } |
| |
| /** |
| * @brief Scan devices on static buses. |
| * |
| * The enumeration of certain buses is purely static. The existence of |
| * devices on those buses can be completely determined at compile time |
| * and is specified in the config file. Typical examples are the 'PNP' |
| * devices on a legacy ISA/LPC bus. There is no need of probing of any kind, |
| * the only thing we have to do is to walk through the bus and |
| * enable or disable devices as indicated in the config file. |
| * |
| * On the other hand, some devices are virtual and their existence is |
| * artificial. They can not be probed at run time. One example is the |
| * debug device. Those virtual devices have to be listed in the config |
| * file under some static bus in order to be enumerated at run time. |
| * |
| * This function is the default scan_bus() method for the root device and |
| * LPC bridges. |
| * |
| * @param bus Pointer to the device structure which the static buses are attached |
| * @param max Maximum bus number currently used before scanning. |
| * @return Largest bus number used. |
| */ |
| static int smbus_max = 0; |
| unsigned int scan_static_bus(device_t bus, unsigned int max) |
| { |
| device_t child; |
| unsigned link; |
| |
| printk_spew("%s for %s\n", __func__, dev_path(bus)); |
| |
| for(link = 0; link < bus->links; link++) { |
| /* for smbus bus enumerate */ |
| child = bus->link[link].children; |
| if(child && child->path.type == DEVICE_PATH_I2C) { |
| bus->link[link].secondary = ++smbus_max; |
| } |
| for(child = bus->link[link].children; child; child = child->sibling) { |
| if (child->chip_ops && child->chip_ops->enable_dev) { |
| child->chip_ops->enable_dev(child); |
| } |
| if (child->ops && child->ops->enable) { |
| child->ops->enable(child); |
| } |
| if (child->path.type == DEVICE_PATH_I2C) { |
| printk_debug("smbus: %s[%d]->", |
| dev_path(child->bus->dev), child->bus->link ); |
| } |
| printk_debug("%s %s\n", |
| dev_path(child), |
| child->enabled?"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_spew("%s scanning...\n", dev_path(child)); |
| max = scan_bus(child, max); |
| } |
| } |
| |
| printk_spew("%s for %s done\n", __func__, dev_path(bus)); |
| |
| return max; |
| } |
| |
| /** |
| * @brief Enable resources for children devices |
| * |
| * @param dev the device whos children's resources are to be enabled |
| * |
| * This function is called by the global enable_resource() indirectly via the |
| * device_operation::enable_resources() method of devices. |
| * |
| * Indirect mutual recursion: |
| * enable_childrens_resources() -> enable_resources() |
| * enable_resources() -> device_operation::enable_resources() |
| * device_operation::enable_resources() -> enable_children_resources() |
| */ |
| 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); |
| } |
| } |
| } |
| |
| void root_dev_enable_resources(device_t dev) |
| { |
| enable_childrens_resources(dev); |
| } |
| |
| /** |
| * @brief Scan root bus for generic systems |
| * |
| * @param root The root device structure |
| * @param max The current bus number scanned so far, usually 0x00 |
| * |
| * This function is the default scan_bus() method of the root device. |
| */ |
| unsigned int root_dev_scan_bus(device_t root, unsigned int max) |
| { |
| return scan_static_bus(root, max); |
| } |
| |
| void root_dev_init(device_t root) |
| { |
| } |
| |
| void root_dev_reset(struct bus *bus) |
| { |
| printk_info("Reseting board...\n"); |
| hard_reset(); |
| } |
| |
| /** |
| * @brief Default device operation for root device |
| * |
| * This is the default device operation for root devices. These operations |
| * should be fully usable as is. However the chip_operations::enable_dev() |
| * of a motherboard can override this if you want non-default behavior. |
| */ |
| struct device_operations default_dev_ops_root = { |
| .read_resources = root_dev_read_resources, |
| .set_resources = root_dev_set_resources, |
| .enable_resources = root_dev_enable_resources, |
| .init = root_dev_init, |
| .scan_bus = root_dev_scan_bus, |
| .reset_bus = root_dev_reset, |
| }; |
| |
| /** |
| * @brief The root of device tree. |
| * |
| * This is the root of the device tree. The device tree is defined in the |
| * static.c file and is generated by config tool during compile time. |
| */ |
| extern struct device dev_root; |