mips: mtmips: add support for MediaTek MT7621 SoC
This patch adds support for MediaTek MT7621 SoC.
All files are dedicated for u-boot.
The default build target is u-boot-mt7621.bin.
The specification of this chip:
https://www.mediatek.com/products/homenetworking/mt7621
Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
diff --git a/arch/mips/mach-mtmips/mt7621/spl/serial.c b/arch/mips/mach-mtmips/mt7621/spl/serial.c
new file mode 100644
index 0000000..5cf093a
--- /dev/null
+++ b/arch/mips/mach-mtmips/mt7621/spl/serial.c
@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2022 MediaTek Inc. All rights reserved.
+ *
+ * Author: Weijie Gao <weijie.gao@mediatek.com>
+ */
+
+#include <asm/io.h>
+#include "../mt7621.h"
+
+void mtmips_spl_serial_init(void)
+{
+#ifdef CONFIG_SPL_SERIAL
+ void __iomem *base = ioremap_nocache(SYSCTL_BASE, SYSCTL_SIZE);
+
+#if CONFIG_CONS_INDEX == 1
+ clrbits_32(base + SYSCTL_GPIOMODE_REG, UART1_MODE);
+#elif CONFIG_CONS_INDEX == 2
+ clrbits_32(base + SYSCTL_GPIOMODE_REG, UART2_MODE_M);
+#elif CONFIG_CONS_INDEX == 3
+ clrbits_32(base + SYSCTL_GPIOMODE_REG, UART3_MODE_M);
+#endif /* CONFIG_CONS_INDEX */
+#endif /* CONFIG_SPL_SERIAL */
+}