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lib: utils: Add fdt_parse_hart_id() function

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Parsing HART id from a CPU DT node is a common requirement for
RISC-V systems. The newly added fdt_parse_hart_id() also helps
reduce duplicate code between fdt_cpu_fixup() function and
fdt_parse_hart_count() function.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Anup Patel
2020-04-26 12:39:13 +05:30
committed by Anup Patel
parent 66185b3ec9
commit 19e966b862
3 changed files with 37 additions and 15 deletions
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28
lib/utils/fdt/fdt_helper.c
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@@ -104,6 +104,34 @@ int fdt_get_node_addr_size(void *fdt, int node, unsigned long *addr,
return 0;
}
int fdt_parse_hart_id(void *fdt, int cpu_offset, u32 *hartid)
{
int len;
const void *prop;
const fdt32_t *val;
if (!fdt || cpu_offset < 0)
return SBI_EINVAL;
prop = fdt_getprop(fdt, cpu_offset, "device_type", &len);
if (!prop || !len)
return SBI_EINVAL;
if (sbi_strcmp(prop, "cpu"))
return SBI_EINVAL;
val = fdt_getprop(fdt, cpu_offset, "reg", &len);
if (!val || len < sizeof(fdt32_t))
return SBI_EINVAL;
if (len > sizeof(fdt32_t))
val++;
if (hartid)
*hartid = fdt32_to_cpu(*val);
return 0;
}
int fdt_parse_sifive_uart_node(void *fdt, int nodeoffset,
struct platform_uart_data *uart)
{