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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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c3b9566de8
The JZ4740 UART interface is almost 16550 compatible. The UART module needs to be enabled by setting a bit in the FCR register and it has support for receive timeout interrupts. Instead of adding yet another machine specific quirk to the 8250 serial driver we provide a serial_out implementation which sets the required additional flags. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/1403/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
34 lines
936 B
C
34 lines
936 B
C
/*
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* Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
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* JZ4740 serial support
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <linux/io.h>
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#include <linux/serial_core.h>
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#include <linux/serial_reg.h>
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void jz4740_serial_out(struct uart_port *p, int offset, int value)
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{
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switch (offset) {
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case UART_FCR:
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value |= 0x10; /* Enable uart module */
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break;
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case UART_IER:
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value |= (value & 0x4) << 2;
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break;
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default:
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break;
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}
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writeb(value, p->membase + (offset << p->regshift));
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}
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