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| author | Heinrich Schuchardt <heinrich.schuchardt@canonical.com> | 2023-09-04 14:24:03 +0300 |
|---|---|---|
| committer | Leo Yu-Chi Liang <ycliang@andestech.com> | 2023-09-05 05:53:55 +0300 |
| commit | d14222e7c152e36bf7d370c2623242a22fb9e821 (patch) | |
| tree | 2c93ebf14147fc4eeefc9f48f16dddbf849df99b | |
| parent | ef08687ea0e2b5d57a1df51e6613bc4263747943 (diff) | |
| download | u-boot-d14222e7c152e36bf7d370c2623242a22fb9e821.tar.xz | |
risc-v: implement DBCN write byte
The DBCN extension provides a Console Write Byte call.
Implement function sbi_dbcn_write_byte to invoke it.
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
| -rw-r--r-- | arch/riscv/include/asm/sbi.h | 1 | ||||
| -rw-r--r-- | arch/riscv/lib/sbi.c | 16 |
2 files changed, 17 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/sbi.h b/arch/riscv/include/asm/sbi.h index 009a26885c..bf4c9af622 100644 --- a/arch/riscv/include/asm/sbi.h +++ b/arch/riscv/include/asm/sbi.h @@ -170,5 +170,6 @@ int sbi_get_mvendorid(long *mvendorid); int sbi_get_marchid(long *marchid); int sbi_get_mimpid(long *mimpid); void sbi_srst_reset(unsigned long type, unsigned long reason); +int sbi_dbcn_write_byte(unsigned char ch); #endif diff --git a/arch/riscv/lib/sbi.c b/arch/riscv/lib/sbi.c index 8724e3a460..55a3bc3b5c 100644 --- a/arch/riscv/lib/sbi.c +++ b/arch/riscv/lib/sbi.c @@ -204,6 +204,22 @@ void sbi_srst_reset(unsigned long type, unsigned long reason) 0, 0, 0, 0); } +/** + * sbi_dbcn_write_byte() - write byte to debug console + * + * @ch: byte to be written + * Return: SBI error code (SBI_SUCCESS = 0 on success) + */ +int sbi_dbcn_write_byte(unsigned char ch) +{ + struct sbiret ret; + + ret = sbi_ecall(SBI_EXT_DBCN, + SBI_EXT_DBCN_CONSOLE_WRITE_BYTE, + ch, 0, 0, 0, 0, 0); + return ret.error; +} + #ifdef CONFIG_SBI_V01 /** |