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

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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: Kaushal Kumar <kaushalk@codeaurora.org>
This commit is contained in:
Kaushal Kumar 2019-11-19 19:14:20 +05:30
parent 2a98f2349d
commit 789ad9a7a8
2 changed files with 65 additions and 0 deletions
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63
drivers/of/fdt.c
View file

@ -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
*

2
include/linux/of_fdt.h
View file

@ -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