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 v2 03/13] openrisc: Add support for liteuart emergency printing
Date: Tue, 17 May 2022 09:55:00 +0900 [thread overview]
Message-ID: <20220517005510.3500105-4-shorne@gmail.com> (raw)
In-Reply-To: <20220517005510.3500105-1-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>
---
Changes since v1:
- Update for patch 2/12 ifdef changes
arch/openrisc/kernel/head.S | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/arch/openrisc/kernel/head.S b/arch/openrisc/kernel/head.S
index 7bfa6e4b60c5..21db50563f97 100644
--- a/arch/openrisc/kernel/head.S
+++ b/arch/openrisc/kernel/head.S
@@ -1555,7 +1555,18 @@ ENTRY(_emergency_putc)
l.movhi r4,hi(UART_BASE_ADD)
l.ori r4,r4,lo(UART_BASE_ADD)
-#if defined(CONFIG_SERIAL_8250)
+#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
1: l.lbz r5,5(r4)
--
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 v2 03/13] openrisc: Add support for liteuart emergency printing
Date: Tue, 17 May 2022 09:55:00 +0900 [thread overview]
Message-ID: <20220517005510.3500105-4-shorne@gmail.com> (raw)
In-Reply-To: <20220517005510.3500105-1-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>
---
Changes since v1:
- Update for patch 2/12 ifdef changes
arch/openrisc/kernel/head.S | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/arch/openrisc/kernel/head.S b/arch/openrisc/kernel/head.S
index 7bfa6e4b60c5..21db50563f97 100644
--- a/arch/openrisc/kernel/head.S
+++ b/arch/openrisc/kernel/head.S
@@ -1555,7 +1555,18 @@ ENTRY(_emergency_putc)
l.movhi r4,hi(UART_BASE_ADD)
l.ori r4,r4,lo(UART_BASE_ADD)
-#if defined(CONFIG_SERIAL_8250)
+#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
1: l.lbz r5,5(r4)
--
2.31.1
next prev parent reply other threads:[~2022-05-17 0:55 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-17 0:54 [PATCH v2 00/13] OpenRISC misc cleanups for 5.19 Stafford Horne
2022-05-17 0:54 ` Stafford Horne
2022-05-17 0:54 ` [PATCH v2 01/13] openrisc: Add gcc machine instruction flag configuration Stafford Horne
2022-05-17 0:54 ` Stafford Horne
2022-05-17 21:27 ` Stafford Horne
2022-05-17 21:27 ` Stafford Horne
2022-05-17 0:54 ` [PATCH v2 02/13] openrisc: Cleanup emergency print handling Stafford Horne
2022-05-17 0:54 ` Stafford Horne
2022-05-17 0:55 ` Stafford Horne [this message]
2022-05-17 0:55 ` [PATCH v2 03/13] openrisc: Add support for liteuart emergency printing Stafford Horne
2022-05-17 0:55 ` [PATCH v2 04/13] openrisc: Add syscall details to emergency syscall debugging Stafford Horne
2022-05-17 0:55 ` Stafford Horne
2022-05-17 0:55 ` [PATCH v2 05/13] openrisc: Pretty print show_registers memory dumps Stafford Horne
2022-05-17 0:55 ` Stafford Horne
2022-05-17 0:55 ` [PATCH v2 06/13] openrisc: Update litex defconfig to support glibc userland Stafford Horne
2022-05-17 0:55 ` Stafford Horne
2022-05-17 0:55 ` [PATCH v2 07/13] openrisc/traps: Declare file scope symbols as static Stafford Horne
2022-05-17 0:55 ` Stafford Horne
2022-05-17 0:55 ` [PATCH v2 08/13] openrisc/traps: Remove die_if_kernel function Stafford Horne
2022-05-17 0:55 ` Stafford Horne
2022-05-17 0:55 ` [PATCH v2 09/13] openrisc/traps: Declare unhandled_exception for asmlinkage Stafford Horne
2022-05-17 0:55 ` Stafford Horne
2022-05-17 0:55 ` [PATCH v2 10/13] openrisc/time: Fix symbol scope warnings Stafford Horne
2022-05-17 0:55 ` Stafford Horne
2022-05-17 0:55 ` [PATCH v2 11/13] openrisc/delay: Add include to fix symbol not declared warning Stafford Horne
2022-05-17 0:55 ` Stafford Horne
2022-05-17 0:55 ` [PATCH v2 12/13] openrisc/fault: Fix symbol scope warnings Stafford Horne
2022-05-17 0:55 ` Stafford Horne
2022-05-17 0:55 ` [PATCH v2 13/13] openrisc: Remove unused IMMU tlb workardound Stafford Horne
2022-05-17 0:55 ` Stafford Horne
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