The DBCN extension provides a Console Write Byte call.
Implement function sbi_dbcn_write_byte to invoke it.
Signed-off-by: Heinrich Schuchardt <heinrich.schucha...@canonical.com>
Reviewed-by: Leo Yu-Chi Liang <ycli...@andestech.com>
---
v2:
no change
---
arch/riscv/include/asm/sbi.h | 1 +
arch/riscv/lib/sbi.c | 16 ++++++++++++++++
2 files changed, 17 insertions(+)
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
/**
--
2.40.1
