linux-kernel - [PATCH 2/8] MIPS: boot: Support specifying UART port on Ingenic SoCs

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Message-Id: <20210530171802.23649-3-paul@crapouillou.net>
Date:   Sun, 30 May 2021 18:17:56 +0100
From:   Paul Cercueil <paul@...pouillou.net>
To:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc:     Rob Herring <robh+dt@...nel.org>,
        周琰杰 <zhouyanjie@...yeetech.com>,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, list@...ndingux.net,
        Paul Cercueil <paul@...pouillou.net>
Subject: [PATCH 2/8] MIPS: boot: Support specifying UART port on Ingenic SoCs

Allow specifying from the config the UART to use on Ingenic SoCs when
compressed kernel debugging is enabled.

Signed-off-by: Paul Cercueil <paul@...pouillou.net>
---
 arch/mips/Kconfig.debug                | 8 ++++++++
 arch/mips/boot/compressed/uart-16550.c | 4 ++--
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/arch/mips/Kconfig.debug b/arch/mips/Kconfig.debug
index f5832a49a881..43dbf5930796 100644
--- a/arch/mips/Kconfig.debug
+++ b/arch/mips/Kconfig.debug
@@ -102,6 +102,14 @@ config DEBUG_ZBOOT
 	  to reduce the kernel image size and speed up the booting procedure a
 	  little.
 
+config ZBOOT_INGENIC_UART
+	int "UART to use for compressed kernel debugging"
+	depends on DEBUG_ZBOOT && MACH_INGENIC_SOC
+	default 0
+	range 0 4
+	help
+	  Specify the UART that should be used for compressed kernel debugging.
+
 config SPINLOCK_TEST
 	bool "Enable spinlock timing tests in debugfs"
 	depends on DEBUG_FS
diff --git a/arch/mips/boot/compressed/uart-16550.c b/arch/mips/boot/compressed/uart-16550.c
index aee8d7b8f091..c18d7f72d9d9 100644
--- a/arch/mips/boot/compressed/uart-16550.c
+++ b/arch/mips/boot/compressed/uart-16550.c
@@ -19,8 +19,8 @@
 #endif
 
 #ifdef CONFIG_MACH_INGENIC
-#define INGENIC_UART0_BASE_ADDR	0x10030000
-#define PORT(offset) (CKSEG1ADDR(INGENIC_UART0_BASE_ADDR) + (4 * offset))
+#define INGENIC_UART_BASE_ADDR	(0x10030000 + 0x1000 * CONFIG_ZBOOT_INGENIC_UART)
+#define PORT(offset) (CKSEG1ADDR(INGENIC_UART_BASE_ADDR) + (4 * offset))
 #endif
 
 #ifdef CONFIG_CPU_XLR
-- 
2.30.2