Commit 6a903a25 authored by Rob Herring's avatar Rob Herring
Browse files

of: introduce common FDT machine related functions 



Introduce common of_flat_dt_match_machine and
of_flat_dt_get_machine_name functions to unify architectures' handling
of machine level model and compatible properties.

Several architectures match the root compatible string with an arch
specific list of machine descriptors duplicating the same search
algorithm. Create a common implementation with a simple architecture
specific hook to iterate over each machine's match table.

Signed-off-by: default avatarRob Herring <rob.herring@calxeda.com>
Acked-by: default avatarGrant Likely <grant.likely@linaro.org>
parent 9b7d9f27

drivers/of/fdt.c

+60 −0
Original line number Diff line number Diff line
@@ -619,6 +619,66 @@ int __init of_scan_flat_dt_by_path(const char *path, 
		return ret;

}



const char * __init of_flat_dt_get_machine_name(void)

{

	const char *name;

	unsigned long dt_root = of_get_flat_dt_root();



	name = of_get_flat_dt_prop(dt_root, "model", NULL);

	if (!name)

		name = of_get_flat_dt_prop(dt_root, "compatible", NULL);

	return name;

}



/**

 * of_flat_dt_match_machine - Iterate match tables to find matching machine.

 *

 * @default_match: A machine specific ptr to return in case of no match.

 * @get_next_compat: callback function to return next compatible match table.

 *

 * Iterate through machine match tables to find the best match for the machine

 * compatible string in the FDT.

 */

const void * __init of_flat_dt_match_machine(const void *default_match,

		const void * (*get_next_compat)(const char * const**))

{

	const void *data = NULL;

	const void *best_data = default_match;

	const char *const *compat;

	unsigned long dt_root;

	unsigned int best_score = ~1, score = 0;



	dt_root = of_get_flat_dt_root();

	while ((data = get_next_compat(&compat))) {

		score = of_flat_dt_match(dt_root, compat);

		if (score > 0 && score < best_score) {

			best_data = data;

			best_score = score;

		}

	}

	if (!best_data) {

		const char *prop;

		long size;



		pr_err("\n unrecognized device tree list:\n[ ");



		prop = of_get_flat_dt_prop(dt_root, "compatible", &size);

		if (prop) {

			while (size > 0) {

				printk("'%s' ", prop);

				size -= strlen(prop) + 1;

				prop += strlen(prop) + 1;

			}

		}

		printk("]\n\n");

		return NULL;

	}



	pr_info("Machine model: %s\n", of_flat_dt_get_machine_name());



	return best_data;

}



#ifdef CONFIG_BLK_DEV_INITRD

/**

 * early_init_dt_check_for_initrd - Decode initrd location from flat tree

include/linux/of_fdt.h

+5 −0
Original line number Diff line number Diff line
@@ -108,11 +108,16 @@ extern int early_init_dt_scan_root(unsigned long node, const char *uname, 


extern bool early_init_dt_scan(void *params);



extern const char *of_flat_dt_get_machine_name(void);

extern const void *of_flat_dt_match_machine(const void *default_match,

		const void * (*get_next_compat)(const char * const**));



/* Other Prototypes */

extern void unflatten_device_tree(void);

extern void unflatten_and_copy_device_tree(void);

extern void early_init_devtree(void *);

#else /* CONFIG_OF_FLATTREE */

static inline const char *of_flat_dt_get_machine_name(void) { return NULL; }

static inline void unflatten_device_tree(void) {}

static inline void unflatten_and_copy_device_tree(void) {}

#endif /* CONFIG_OF_FLATTREE */

CRA Git | Maintained and supported by SUSTech CRA and CCSE