From 5de8c1d49983ada5daa68fc01979526f510d8063 Mon Sep 17 00:00:00 2001
From: Yu-Chien Peter Lin <peter.lin@sifive.com>
Date: Thu, 14 Aug 2025 19:10:12 +0800
Subject: [PATCH] lib: serial: sifive-uart: add shared memory region for SiFive
 UART

Add shared memory region so the driver has permission
to access it in OpenSBI.

Signed-off-by: Yu-Chien Peter Lin <peter.lin@sifive.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20250814111012.20151-1-peter.lin@sifive.com
Signed-off-by: Anup Patel <anup@brainfault.org>
---
 lib/utils/serial/sifive-uart.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/utils/serial/sifive-uart.c b/lib/utils/serial/sifive-uart.c
index 3581d47a..55637137 100644
--- a/lib/utils/serial/sifive-uart.c
+++ b/lib/utils/serial/sifive-uart.c
@@ -9,6 +9,7 @@
 
 #include <sbi/riscv_io.h>
 #include <sbi/sbi_console.h>
+#include <sbi/sbi_domain.h>
 #include <sbi_utils/serial/sifive-uart.h>
 
 /* clang-format off */
@@ -111,5 +112,7 @@ int sifive_uart_init(unsigned long base, u32 in_freq, u32 baudrate)
 
 	sbi_console_set_device(&sifive_console);
 
-	return 0;
+	return sbi_domain_root_add_memrange(base, PAGE_SIZE, PAGE_SIZE,
+					    (SBI_DOMAIN_MEMREGION_MMIO |
+					    SBI_DOMAIN_MEMREGION_SHARED_SURW_MRW));
 }