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From: Du Huanpeng <u74147@gmail.com>
To: barebox@lists.infradead.org
Cc: Du Huanpeng <u74147@gmail.com>
Subject: [PATCH] MIPS: DEBUG_LL_UART_DIVISOR is 0, use a0 instead
Date: Fri, 11 Sep 2020 20:33:58 +0800	[thread overview]
Message-ID: <1599827638-15320-2-git-send-email-u74147@gmail.com> (raw)
In-Reply-To: <1599827638-15320-1-git-send-email-u74147@gmail.com>

this make it possiable pass a0 as divisor to calculate uart baudrate
in run time on boot.

Signed-off-by: Du Huanpeng <u74147@gmail.com>
---
 arch/mips/include/asm/debug_ll_ns16550.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/mips/include/asm/debug_ll_ns16550.h b/arch/mips/include/asm/debug_ll_ns16550.h
index df58c4c..a33587a 100644
--- a/arch/mips/include/asm/debug_ll_ns16550.h
+++ b/arch/mips/include/asm/debug_ll_ns16550.h
@@ -66,6 +66,9 @@ static inline void PUTC_LL(char ch)
 	sb	t1, UART_LCR(t0)		/* Write it out */
 
 	li	t1, DEBUG_LL_UART_DIVISOR
+#if DEBUG_LL_UART_DIVISOR == 0
+	move	t1, a0
+#endif
 	sb	t1, UART_DLL(t0)		/* write low order byte */
 	srl	t1, t1, 8
 	sb	t1, UART_DLM(t0)		/* write high order byte */
-- 
2.7.4


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  reply	other threads:[~2020-09-11 12:34 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-11 12:33 [PATCH] MIPS: loongson1: enable to run from spi flash Du Huanpeng
2020-09-11 12:33 ` Du Huanpeng [this message]
2020-09-11 14:07   ` [PATCH] MIPS: DEBUG_LL_UART_DIVISOR is 0, use a0 instead Ahmad Fatoum
2020-09-17 13:56     ` Du Huanpeng
2020-09-17 17:42       ` Ahmad Fatoum
2020-09-25 16:42         ` Du Huanpeng
2020-09-25 17:54           ` Ahmad Fatoum

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