linux-kernel - [PATCH] mips: ralink: mt7621: add zboot debug console

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Date:   Thu, 15 Oct 2020 13:26:21 +0800
From:   Chuanhong Guo <gch981213@...il.com>
To:     linux-mips@...r.kernel.org
Cc:     Chuanhong Guo <gch981213@...il.com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        John Crispin <john@...ozen.org>, linux-kernel@...r.kernel.org
Subject: [PATCH] mips: ralink: mt7621: add zboot debug console

uartlite0 at 0x1e000c00 is a 16550 compatible uart controller. It's
usually used for debug console and is already configured by u-boot.
Add ZBOOT_UART16550 and related definitions in uart-16550.c for zboot
debug output.

Signed-off-by: Chuanhong Guo <gch981213@...il.com>
---
 arch/mips/boot/compressed/uart-16550.c | 6 ++++++
 arch/mips/ralink/Kconfig               | 1 +
 2 files changed, 7 insertions(+)

diff --git a/arch/mips/boot/compressed/uart-16550.c b/arch/mips/boot/compressed/uart-16550.c
index aee8d7b8f091..7122df28967a 100644
--- a/arch/mips/boot/compressed/uart-16550.c
+++ b/arch/mips/boot/compressed/uart-16550.c
@@ -35,6 +35,12 @@
 #define IOTYPE unsigned int
 #endif
 
+#ifdef CONFIG_SOC_MT7621
+#define UART0_BASE  0x1e000c00
+#define PORT(offset) (CKSEG1ADDR(UART0_BASE) + (4 * offset))
+#define IOTYPE unsigned int
+#endif
+
 #ifndef IOTYPE
 #define IOTYPE char
 #endif
diff --git a/arch/mips/ralink/Kconfig b/arch/mips/ralink/Kconfig
index c10d8b233ab1..4c3c6ef330e3 100644
--- a/arch/mips/ralink/Kconfig
+++ b/arch/mips/ralink/Kconfig
@@ -52,6 +52,7 @@ choice
 		select SYS_SUPPORTS_SMP
 		select SYS_SUPPORTS_MIPS_CPS
 		select SYS_SUPPORTS_HIGHMEM
+		select SYS_SUPPORTS_ZBOOT_UART16550
 		select MIPS_GIC
 		select COMMON_CLK
 		select CLKSRC_MIPS_GIC
-- 
2.26.2