From: Stafford Horne <shorne@gmail.com>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Jonas Bonn <jonas@southpole.se>,
Openrisc <openrisc@lists.librecores.org>,
Randy Dunlap <rdunlap@infradead.org>
Subject: [PATCH 03/13] openrisc: Add support for liteuart emergency printing
Date: Sun, 15 May 2022 21:41:48 +0900 [thread overview]
Message-ID: <20220515124158.3167452-4-shorne@gmail.com> (raw)
In-Reply-To: <20220515124158.3167452-1-shorne@gmail.com>
This patch adds support for sending emergency print output, such as
unhandled exception details, to a liteuart serial device. This is the
default device available on litex platforms.
If a developer want to use this they should update UART_BASE_ADD
to the address of liteuart.
Signed-off-by: Stafford Horne <shorne@gmail.com>
---
arch/openrisc/kernel/head.S | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/arch/openrisc/kernel/head.S b/arch/openrisc/kernel/head.S
index b1f3a65c271c..21db50563f97 100644
--- a/arch/openrisc/kernel/head.S
+++ b/arch/openrisc/kernel/head.S
@@ -1555,6 +1555,17 @@ ENTRY(_emergency_putc)
l.movhi r4,hi(UART_BASE_ADD)
l.ori r4,r4,lo(UART_BASE_ADD)
+#if defined(CONFIG_SERIAL_LITEUART)
+ /* Check OFF_TXFULL status */
+1: l.lwz r5,4(r4)
+ l.andi r5,r5,0xff
+ l.sfnei r5,0
+ l.bf 1b
+ l.nop
+
+ /* Write character */
+ l.andi r7,r7,0xff
+ l.sw 0(r4),r7
#elif defined(CONFIG_SERIAL_8250)
/* Check UART LSR THRE (hold) bit */
l.addi r6,r0,0x20
--
2.31.1
WARNING: multiple messages have this Message-ID (diff)
From: Stafford Horne <shorne@gmail.com>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Openrisc <openrisc@lists.librecores.org>,
Stafford Horne <shorne@gmail.com>,
Jonas Bonn <jonas@southpole.se>,
Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>,
Randy Dunlap <rdunlap@infradead.org>
Subject: [PATCH 03/13] openrisc: Add support for liteuart emergency printing
Date: Sun, 15 May 2022 21:41:48 +0900 [thread overview]
Message-ID: <20220515124158.3167452-4-shorne@gmail.com> (raw)
In-Reply-To: <20220515124158.3167452-1-shorne@gmail.com>
This patch adds support for sending emergency print output, such as
unhandled exception details, to a liteuart serial device. This is the
default device available on litex platforms.
If a developer want to use this they should update UART_BASE_ADD
to the address of liteuart.
Signed-off-by: Stafford Horne <shorne@gmail.com>
---
arch/openrisc/kernel/head.S | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/arch/openrisc/kernel/head.S b/arch/openrisc/kernel/head.S
index b1f3a65c271c..21db50563f97 100644
--- a/arch/openrisc/kernel/head.S
+++ b/arch/openrisc/kernel/head.S
@@ -1555,6 +1555,17 @@ ENTRY(_emergency_putc)
l.movhi r4,hi(UART_BASE_ADD)
l.ori r4,r4,lo(UART_BASE_ADD)
+#if defined(CONFIG_SERIAL_LITEUART)
+ /* Check OFF_TXFULL status */
+1: l.lwz r5,4(r4)
+ l.andi r5,r5,0xff
+ l.sfnei r5,0
+ l.bf 1b
+ l.nop
+
+ /* Write character */
+ l.andi r7,r7,0xff
+ l.sw 0(r4),r7
#elif defined(CONFIG_SERIAL_8250)
/* Check UART LSR THRE (hold) bit */
l.addi r6,r0,0x20
--
2.31.1
next prev parent reply other threads:[~2022-05-15 12:42 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-15 12:41 [PATCH 00/13] OpenIRSC misc cleanups for 5.19 Stafford Horne
2022-05-15 12:41 ` Stafford Horne
2022-05-15 12:41 ` [PATCH 01/13] openrisc: Add gcc machine instruction flag configuration Stafford Horne
2022-05-15 12:41 ` Stafford Horne
2022-05-15 12:41 ` [PATCH 02/13] openrisc: Cleanup emergency print handling Stafford Horne
2022-05-15 12:41 ` Stafford Horne
2022-05-15 16:03 ` Samuel Holland
2022-05-15 16:03 ` Samuel Holland
2022-05-15 21:36 ` Stafford Horne
2022-05-15 21:36 ` Stafford Horne
2022-05-15 12:41 ` Stafford Horne [this message]
2022-05-15 12:41 ` [PATCH 03/13] openrisc: Add support for liteuart emergency printing Stafford Horne
2022-05-15 12:41 ` [PATCH 04/13] openrisc: Add syscall details to emergency syscall debugging Stafford Horne
2022-05-15 12:41 ` Stafford Horne
2022-05-15 12:41 ` [PATCH 05/13] openrisc: Pretty print show_registers memory dumps Stafford Horne
2022-05-15 12:41 ` Stafford Horne
2022-05-15 12:41 ` [PATCH 06/13] openrisc: Update litex defconfig to support glibc userland Stafford Horne
2022-05-15 12:41 ` Stafford Horne
2022-05-15 12:41 ` [PATCH 07/13] openrisc/traps: Declare file scope symbols as static Stafford Horne
2022-05-15 12:41 ` Stafford Horne
2022-05-15 12:41 ` [PATCH 08/13] openrisc/traps: Remove die_if_kernel function Stafford Horne
2022-05-15 12:41 ` Stafford Horne
2022-05-15 12:41 ` [PATCH 09/13] openrisc/traps: Declare unhandled_exception for asmlinkage Stafford Horne
2022-05-15 12:41 ` Stafford Horne
2022-05-15 12:41 ` [PATCH 10/13] openrisc/time: Fix symbol scope warnings Stafford Horne
2022-05-15 12:41 ` Stafford Horne
2022-05-15 12:41 ` [PATCH 11/13] openrisc/delay: Add include to fix symbol not declared warning Stafford Horne
2022-05-15 12:41 ` Stafford Horne
2022-05-15 12:41 ` [PATCH 12/13] openrisc/fault: Fix symbol scope warnings Stafford Horne
2022-05-15 12:41 ` Stafford Horne
2022-05-15 12:41 ` [PATCH 13/13] openrisc: Remove unused IMMU tlb workardound Stafford Horne
2022-05-15 12:41 ` Stafford Horne
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