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Commit 789ad9a7 authored by Kaushal Kumar's avatar Kaushal Kumar
Browse files

drivers: of: Add APIs to find DDR device rank, HBB 



Add APIs to find the DDR device rank and Highest
Bank Bit (HBB) information from their respective
memory nodes.

Change-Id: Iae94efc681daf2cf0a531dceb8d2acdcf3484388
Signed-off-by: default avatarKaushal Kumar <kaushalk@codeaurora.org>
parent 2a98f234

drivers/of/fdt.c

+63 −0
Original line number Diff line number Diff line
@@ -79,6 +79,69 @@ void of_fdt_limit_memory(int limit) 
	}

}



/**

 * of_fdt_get_ddrhbb - Return the highest bank bit of ddr on the current device

 *

 * On match, returns a non-zero positive value which matches the highest bank

 * bit.

 * Otherwise returns -ENOENT.

 */

int of_fdt_get_ddrhbb(int channel, int rank)

{

	int memory;

	int len;

	int ret;

	/* Single spaces reserved for channel(0-9), rank(0-9) */

	char pname[] = "ddr_device_hbb_ch _rank ";

	fdt32_t *prop = NULL;



	memory = fdt_path_offset(initial_boot_params, "/memory");

	if (memory > 0) {

		snprintf(pname, sizeof(pname),

			 "ddr_device_hbb_ch%d_rank%d", channel, rank);

		prop = fdt_getprop_w(initial_boot_params, memory,

				     pname, &len);

	}



	if (!prop || len != sizeof(u32))

		return -ENOENT;



	ret = fdt32_to_cpu(*prop);



	return ret;

}



/**

 * of_fdt_get_ddrrank - Return the rank of ddr on the current device

 *

 * On match, returns a non-zero positive value which matches the ddr rank.

 * Otherwise returns -ENOENT.

 */

int of_fdt_get_ddrrank(int channel)

{

	int memory;

	int len;

	int ret;

	/* Single space reserved for channel(0-9) */

	char pname[] = "ddr_device_rank_ch ";

	fdt32_t *prop = NULL;



	memory = fdt_path_offset(initial_boot_params, "/memory");

	if (memory > 0) {

		snprintf(pname, sizeof(pname),

			 "ddr_device_rank_ch%d", channel);

		prop = fdt_getprop_w(initial_boot_params, memory,

				     pname, &len);

	}



	if (!prop || len != sizeof(u32))

		return -ENOENT;



	ret = fdt32_to_cpu(*prop);



	return ret;

}



/**

 * of_fdt_get_ddrtype - Return the type of ddr (4/5) on the current device

 *

include/linux/of_fdt.h

+2 −0
Original line number Diff line number Diff line
@@ -48,6 +48,8 @@ extern char __dtb_end[]; 
extern u64 of_flat_dt_translate_address(unsigned long node);

extern void of_fdt_limit_memory(int limit);

extern int of_fdt_get_ddrtype(void);

extern int of_fdt_get_ddrrank(int channel);

extern int of_fdt_get_ddrhbb(int channel, int rank);

#endif /* CONFIG_OF_FLATTREE */



#ifdef CONFIG_OF_EARLY_FLATTREE