/*
* 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 <linux/io.h>
#include <asm/irq.h>
#include <mach/hardware.h>
#include <mach/serial.h>
#include <mach/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);
