Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 * TI DaVinci serial driver

 *

 * Copyright (C) 2006 Texas Instruments.

 *

 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.

 *

 */

#include <linux/kernel.h>

#include <linux/init.h>

#include <linux/serial_8250.h>

#include <linux/serial_reg.h>

#include <linux/platform_device.h>

#include <linux/delay.h>

#include <linux/clk.h>

#include <asm/io.h>

#include <asm/irq.h>

#include <asm/hardware.h>

#include <asm/arch/serial.h>

#include <asm/arch/irqs.h>

#define UART_DAVINCI_PWREMU 0x0c

static inline unsigned int davinci_serial_in(struct plat_serial8250_port *up,

                                          int offset)

{

        offset <<= up->regshift;

        return (unsigned int)__raw_readb(up->membase + offset);

}

static inline void davinci_serial_outp(struct plat_serial8250_port *p,

                                       int offset, int value)

{

        offset <<= p->regshift;

        __raw_writeb(value, p->membase + offset);

}

static struct plat_serial8250_port serial_platform_data[] = {

        {

                .membase        = (char *)IO_ADDRESS(DAVINCI_UART0_BASE),

                .mapbase        = (unsigned long)DAVINCI_UART0_BASE,

                .irq            = IRQ_UARTINT0,

                .flags          = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,

                .iotype         = UPIO_MEM,

                .regshift       = 2,

                .uartclk        = 27000000,

        },

        {

                .flags          = 0

        },

};

static struct platform_device serial_device = {

        .name                   = "serial8250",

        .id                     = PLAT8250_DEV_PLATFORM,

        .dev                    = {

                .platform_data  = serial_platform_data,

        },

};

static void __init davinci_serial_reset(struct plat_serial8250_port *p)

{

        /* reset both transmitter and receiver: bits 14,13 = UTRST, URRST */

        unsigned int pwremu = 0;

        davinci_serial_outp(p, UART_IER, 0);  /* disable all interrupts */

        davinci_serial_outp(p, UART_DAVINCI_PWREMU, pwremu);

        mdelay(10);

        pwremu |= (0x3 << 13);

        pwremu |= 0x1;

        davinci_serial_outp(p, UART_DAVINCI_PWREMU, pwremu);

}

static int __init davinci_init(void)

{

        davinci_serial_reset(&serial_platform_data[0]);

        return platform_device_register(&serial_device);

}

arch_initcall(davinci_init);