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device: Add a helper function to add a downstream bus

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Adding downstream busses at runtime is a common pattern so add a helper
function.

Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Change-Id: Ic898189b92997b93304fcbf47c73e2bb5ec09023
Reviewed-on: https://review.coreboot.org/c/coreboot/+/80210
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
This commit is contained in:
Arthur Heymans 2024-01-25 22:26:07 +01:00
commit 3e99ba02a4
4 changed files with 40 additions and 17 deletions
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6
src/include/device/device.h
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@ -171,6 +171,7 @@ extern struct bus *free_links;
/* Generic device interface functions */
struct device *alloc_dev(struct bus *parent, struct device_path *path);
struct bus *alloc_bus(struct device *parent);
void dev_initialize_chips(void);
void dev_enumerate(void);
void dev_configure(void);
@ -229,10 +230,9 @@ void mp_init_cpus(DEVTREE_CONST struct bus *cpu_bus);
static inline void mp_cpu_bus_init(struct device *dev)
{
/* Make sure the cpu cluster has a downstream bus for LAPICs to be allocated. */
if (!dev->link_list)
add_more_links(dev, 1);
struct bus *bus = alloc_bus(dev);
mp_init_cpus(dev->link_list);
mp_init_cpus(bus);
}
/* Debug functions */