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authorDamien Le Moal <damien.lemoal@wdc.com>2020-03-16 09:47:38 +0900
committerPalmer Dabbelt <palmerdabbelt@google.com>2020-04-03 10:46:43 -0700
commit335b139057ef79dbede01dea6e8c3f47c2b88802 (patch)
treea00fb4785ff526dbca683b360e2239cad46c7487 /arch/riscv/kernel/head.S
parent956d705dd279f70d5a222375fa97b637d6e8c43d (diff)
riscv: Add SOC early init support
Add a mechanism for early SoC initialization for platforms that need additional hardware initialization not possible through the regular device tree and drivers mechanism. With this, a SoC specific initialization function can be called very early, before DTB parsing is done by parse_dtb() in Linux RISC-V kernel setup code. This can be very useful for early hardware initialization for No-MMU kernels booted directly in M-mode because it is quite likely that no other booting stage exist prior to the No-MMU kernel. Example use of a SoC early initialization is as follows: static void vendor_abc_early_init(const void *fdt) { /* * some early init code here that can use simple matches * against the flat device tree file. */ } SOC_EARLY_INIT_DECLARE("vendor,abc", abc_early_init); This early initialization function is executed only if the flat device tree for the board has a 'compatible = "vendor,abc"' entry; Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> Signed-off-by: Anup Patel <anup.patel@wdc.com> Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
Diffstat (limited to 'arch/riscv/kernel/head.S')
-rw-r--r--arch/riscv/kernel/head.S1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/riscv/kernel/head.S b/arch/riscv/kernel/head.S
index e5115d5e0b3a..98a406474e7d 100644
--- a/arch/riscv/kernel/head.S
+++ b/arch/riscv/kernel/head.S
@@ -234,6 +234,7 @@ clear_bss_done:
call kasan_early_init
#endif
/* Start the kernel */
+ call soc_early_init
call parse_dtb
tail start_kernel