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| author | Anup Patel <anup.patel@wdc.com> | 2020-04-24 15:08:19 +0530 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2020-05-01 09:44:55 +0530 |
| commit | 44dd7be3b2b3b821912e32a1021706a2edb9d44b (patch) | |
| tree | 5c6c05162805a80e8eea7113702273a2a0d292f1 /lib/utils | |
| parent | 19e966b8622e21c6beb2872d3e4373de9dbfef45 (diff) | |
lib: utils: Add fdt_parse_max_hart_id() API
We add fdt_parse_max_hart_id() API which return max HART id based
on CPU DT nodes. This will be used by generic FDT based drivers in
subsequent patches.
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>
Diffstat (limited to 'lib/utils')
| -rw-r--r-- | lib/utils/fdt/fdt_helper.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/lib/utils/fdt/fdt_helper.c b/lib/utils/fdt/fdt_helper.c index af13810..2d79f75 100644 --- a/lib/utils/fdt/fdt_helper.c +++ b/lib/utils/fdt/fdt_helper.c @@ -132,6 +132,34 @@ int fdt_parse_hart_id(void *fdt, int cpu_offset, u32 *hartid) return 0; } +int fdt_parse_max_hart_id(void *fdt, u32 *max_hartid) +{ + u32 hartid; + int err, cpu_offset, cpus_offset; + + if (!fdt) + return SBI_EINVAL; + if (!max_hartid) + return 0; + + *max_hartid = 0; + + cpus_offset = fdt_path_offset(fdt, "/cpus"); + if (cpus_offset < 0) + return cpus_offset; + + fdt_for_each_subnode(cpu_offset, fdt, cpus_offset) { + err = fdt_parse_hart_id(fdt, cpu_offset, &hartid); + if (err) + continue; + + if (hartid > *max_hartid) + *max_hartid = hartid; + } + + return 0; +} + int fdt_parse_sifive_uart_node(void *fdt, int nodeoffset, struct platform_uart_data *uart) { |