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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/mips/mti-malta/malta-platform.c
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/*

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 * This file is subject to the terms and conditions of the GNU General Public

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 * License.  See the file "COPYING" in the main directory of this archive

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 * for more details.

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 *

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 * Copyright (C) 2006, 07 MIPS Technologies, Inc.

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 *   written by Ralf Baechle ([email protected])

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 *     written by Ralf Baechle <[email protected]>

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 *

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 * Copyright (C) 2008 Wind River Systems, Inc.

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 *   updated by Tiejun Chen <[email protected]>

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 *

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 * 1. Probe driver for the Malta's UART ports:

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 *

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 *   o 2 ports in the SMC SuperIO

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 *   o 1 port in the CBUS UART, a discrete 16550 which normally is only used

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 *     for bringups.

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 *

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 * We don't use 8250_platform.c on Malta as it would result in the CBUS

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 * UART becoming ttyS0.

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 *

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 * 2. Register RTC-CMOS platform device on Malta.

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 */

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#include <linux/init.h>

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#include <linux/serial_8250.h>

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#include <linux/irq.h>

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#include <linux/platform_device.h>

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#include <asm/mips-boards/maltaint.h>

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#define SMC_PORT(base, int)						\

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{									\

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	.iobase		= base,						\

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	.irq		= int,						\

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	.uartclk	= 1843200,					\

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	.iotype		= UPIO_PORT,					\

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	.flags		= UPF_BOOT_AUTOCONF | UPF_SKIP_TEST |		\

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			  UPF_MAGIC_MULTIPLIER,				\

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	.regshift	= 0,						\

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}

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#define CBUS_UART_FLAGS (UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_IOREMAP)

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static struct plat_serial8250_port uart8250_data[] = {

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	SMC_PORT(0x3F8, 4),

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	SMC_PORT(0x2F8, 3),

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	{

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		.mapbase	= 0x1f000900,	/* The CBUS UART */

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		.irq		= MIPS_CPU_IRQ_BASE + MIPSCPU_INT_MB2,

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		.uartclk	= 3686400,	/* Twice the usual clk! */

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		.iotype		= IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) ?

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				  UPIO_MEM32BE : UPIO_MEM32,

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		.flags		= CBUS_UART_FLAGS,

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		.regshift	= 3,

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	},

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	{ },

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};

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static struct platform_device malta_uart8250_device = {

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	.name			= "serial8250",

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	.id			= PLAT8250_DEV_PLATFORM,

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	.dev			= {

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		.platform_data	= uart8250_data,

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	},

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};

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static struct platform_device *malta_devices[] __initdata = {

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	&malta_uart8250_device,

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};

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static int __init malta_add_devices(void)

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{

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	return platform_add_devices(malta_devices, ARRAY_SIZE(malta_devices));

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}

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device_initcall(malta_add_devices);

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