serial.c

linux 内核源代码

/*
 *  Registration of Lasat UART platform device.
 *
 *  Copyright (C) 2007  Brian Murphy <[e-mail]>
 *
 *  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.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 * 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/platform_device.h>
#include <linux/serial_8250.h>

#include <asm/bootinfo.h>
#include <asm/lasat/lasat.h>
#include <asm/lasat/serial.h>

static struct resource lasat_serial_res[2] __initdata;

static struct plat_serial8250_port lasat_serial8250_port[] = {
	{
		.iotype		= UPIO_MEM,
		.flags		= UPF_IOREMAP | UPF_BOOT_AUTOCONF |
				  UPF_SKIP_TEST,
	},
	{},
};

static __init int lasat_uart_add(void)
{
	struct platform_device *pdev;
	int retval;

	pdev = platform_device_alloc("serial8250", -1);
	if (!pdev)
		return -ENOMEM;

	if (mips_machtype == MACH_LASAT_100) {
		lasat_serial_res[0].start = KSEG1ADDR(LASAT_UART_REGS_BASE_100);
		lasat_serial_res[0].end = lasat_serial_res[0].start + LASAT_UART_REGS_SHIFT_100 * 8 - 1;
		lasat_serial_res[0].flags = IORESOURCE_MEM;
		lasat_serial_res[1].start = LASATINT_UART_100;
		lasat_serial_res[1].end = LASATINT_UART_100;
		lasat_serial_res[1].flags = IORESOURCE_IRQ;

		lasat_serial8250_port[0].mapbase = LASAT_UART_REGS_BASE_100;
		lasat_serial8250_port[0].uartclk = LASAT_BASE_BAUD_100 * 16;
		lasat_serial8250_port[0].regshift = LASAT_UART_REGS_SHIFT_100;
		lasat_serial8250_port[0].irq = LASATINT_UART_100;
	} else {
		lasat_serial_res[0].start = KSEG1ADDR(LASAT_UART_REGS_BASE_200);
		lasat_serial_res[0].end = lasat_serial_res[0].start + LASAT_UART_REGS_SHIFT_200 * 8 - 1;
		lasat_serial_res[0].flags = IORESOURCE_MEM;
		lasat_serial_res[1].start = LASATINT_UART_200;
		lasat_serial_res[1].end = LASATINT_UART_200;
		lasat_serial_res[1].flags = IORESOURCE_IRQ;

		lasat_serial8250_port[0].mapbase = LASAT_UART_REGS_BASE_200;
		lasat_serial8250_port[0].uartclk = LASAT_BASE_BAUD_200 * 16;
		lasat_serial8250_port[0].regshift = LASAT_UART_REGS_SHIFT_200;
		lasat_serial8250_port[0].irq = LASATINT_UART_200;
	}

	pdev->id = PLAT8250_DEV_PLATFORM;
	pdev->dev.platform_data = lasat_serial8250_port;

	retval = platform_device_add_resources(pdev, lasat_serial_res, ARRAY_SIZE(lasat_serial_res));
	if (retval)
		goto err_free_device;

	retval = platform_device_add(pdev);
	if (retval)
		goto err_free_device;

	return 0;

err_free_device:
	platform_device_put(pdev);

	return retval;
}
device_initcall(lasat_uart_add);