From: Antony Pavlov <antonynpavlov@gmail.com>
To: barebox@lists.infradead.org
Subject: [PATCH] MIPS: qemu-malta: add CBUS UART support
Date: Wed, 2 Apr 2014 11:41:31 +0400 [thread overview]
Message-ID: <1396424491-1651-1-git-send-email-antonynpavlov@gmail.com> (raw)
This patch adds CBUS UART dts support;
also it adds the necessary macros for DEBUG_LL.
qemu-malta supports three serial interfaces:
* two ports are provided by the FDC37M817
Super I/O; this chip is connected via LPC bus
to Intel 82371EB (PIIX4E) South Bridge;
* the third serial port is provided by
the discrete TI 16C550C (CBUS UART);
this chip is connected via CBUS directly
to the board's GT64120 North Bridge.
See Malta User's Manual (MD00048) for details.
CBUS UART Instructions for use:
1. Enable CONFIG_CONSOLE_ACTIVATE_ALL in .config
(or disable uart0 in dts) and compile barebox;
2. run qemu:
qemu-system-mips -nographic -nodefaults \
-monitor null -M malta -m 256 \
-serial null -serial null -serial stdio \
-bios barebox-flash-image
Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
---
arch/mips/dts/qemu-malta.dts | 8 ++++++++
arch/mips/mach-malta/include/mach/hardware.h | 3 +++
2 files changed, 11 insertions(+)
diff --git a/arch/mips/dts/qemu-malta.dts b/arch/mips/dts/qemu-malta.dts
index b6b69c4..67fe591 100644
--- a/arch/mips/dts/qemu-malta.dts
+++ b/arch/mips/dts/qemu-malta.dts
@@ -25,6 +25,14 @@
clock-frequency = <1843200>;
};
+ uart2: serial@bf000900 {
+ compatible = "ns16550a";
+ reg = <0xbf000900 0x40>;
+ reg-shift = <3>;
+ /* no matter for emulated port */
+ clock-frequency = <1843200>;
+ };
+
nor0: flash@be000000 {
#address-cells = <1>;
#size-cells = <1>;
diff --git a/arch/mips/mach-malta/include/mach/hardware.h b/arch/mips/mach-malta/include/mach/hardware.h
index 9345a67..ba28cb8 100644
--- a/arch/mips/mach-malta/include/mach/hardware.h
+++ b/arch/mips/mach-malta/include/mach/hardware.h
@@ -20,6 +20,9 @@
#define MALTA_PIIX4_UART0 0xb80003f8
+#define MALTA_CBUS_UART 0xbf000900
+#define MALTA_CBUS_UART_SHIFT 3
+
/*
* Reset register.
*/
--
1.9.0
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next reply other threads:[~2014-04-02 7:42 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-02 7:41 Antony Pavlov [this message]
2014-04-03 5:55 ` Sascha Hauer
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