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Date: Sat, 19 Jun 2010 07:08:16 +0200 From: Lars-Peter Clausen <lars@...afoo.de> To: Ralf Baechle <ralf@...ux-mips.org> Cc: linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org, Lars-Peter Clausen <lars@...afoo.de> Subject: [PATCH v2 11/26] MIPS: JZ4740: Add serial support This patch adds support for serials on a JZ4740 SoC. 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@...afoo.de> --- arch/mips/jz4740/serial.c | 33 +++++++++++++++++++++++++++++++++ arch/mips/jz4740/serial.h | 21 +++++++++++++++++++++ 2 files changed, 54 insertions(+), 0 deletions(-) create mode 100644 arch/mips/jz4740/serial.c create mode 100644 arch/mips/jz4740/serial.h diff --git a/arch/mips/jz4740/serial.c b/arch/mips/jz4740/serial.c new file mode 100644 index 0000000..d23de45 --- /dev/null +++ b/arch/mips/jz4740/serial.c @@ -0,0 +1,33 @@ +/* + * Copyright (C) 2010, Lars-Peter Clausen <lars@...afoo.de> + * JZ4740 serial support + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 675 Mass Ave, Cambridge, MA 02139, USA. + * + */ + +#include <linux/io.h> +#include <linux/serial_core.h> +#include <linux/serial_reg.h> + +void jz4740_serial_out(struct uart_port *p, int offset, int value) +{ + switch (offset) { + case UART_FCR: + value |= 0x10; /* Enable uart module */ + break; + case UART_IER: + value |= (value & 0x4) << 2; + break; + default: + break; + } + writeb(value, p->membase + (offset << p->regshift)); +} diff --git a/arch/mips/jz4740/serial.h b/arch/mips/jz4740/serial.h new file mode 100644 index 0000000..247a7d8 --- /dev/null +++ b/arch/mips/jz4740/serial.h @@ -0,0 +1,21 @@ +/* + * Copyright (C) 2010, Lars-Peter Clausen <lars@...afoo.de> + * JZ4740 serial support + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 675 Mass Ave, Cambridge, MA 02139, USA. + * + */ + +#ifndef __MIPS_JZ4740_SERIAL_H__ + +void jz4740_serial_out(struct uart_port *p, int offset, int value); + +#endif + -- 1.5.6.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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