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/*
* arch/arm/mach-omap2/serial.c
*
* OMAP2 serial support.
*
* Copyright (C) 2005-2008 Nokia Corporation
* Author: Paul Mundt <paul.mundt@nokia.com>
*
* Based off of arch/arm/mach-omap/omap1/serial.c
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/serial_8250.h>
#include <linux/serial_reg.h>
#include <linux/clk.h>
#include <asm/io.h>
#include <mach/common.h>
#include <mach/board.h>
static struct clk *uart_ick[OMAP_MAX_NR_PORTS];
static struct clk *uart_fck[OMAP_MAX_NR_PORTS];
static struct plat_serial8250_port serial_platform_data[] = {
{
.membase = IO_ADDRESS(OMAP_UART1_BASE),
.mapbase = OMAP_UART1_BASE,
.irq = 72,
.flags = UPF_BOOT_AUTOCONF,
.iotype = UPIO_MEM,
.regshift = 2,
.uartclk = OMAP24XX_BASE_BAUD * 16,
}, {
.membase = IO_ADDRESS(OMAP_UART2_BASE),
.mapbase = OMAP_UART2_BASE,
.irq = 73,
.flags = UPF_BOOT_AUTOCONF,
.iotype = UPIO_MEM,
.regshift = 2,
.uartclk = OMAP24XX_BASE_BAUD * 16,
}, {
.membase = IO_ADDRESS(OMAP_UART3_BASE),
.mapbase = OMAP_UART3_BASE,
.irq = 74,
.flags = UPF_BOOT_AUTOCONF,
.iotype = UPIO_MEM,
.regshift = 2,
.uartclk = OMAP24XX_BASE_BAUD * 16,
}, {
.flags = 0
}
};
static inline unsigned int serial_read_reg(struct plat_serial8250_port *up,
int offset)
{
offset <<= up->regshift;
return (unsigned int)__raw_readb(up->membase + offset);
}
static inline void serial_write_reg(struct plat_serial8250_port *p, int offset,
int value)
{
offset <<= p->regshift;
__raw_writeb(value, p->membase + offset);
}
/*
* Internal UARTs need to be initialized for the 8250 autoconfig to work
* properly. Note that the TX watermark initialization may not be needed
* once the 8250.c watermark handling code is merged.
*/
static inline void __init omap_serial_reset(struct plat_serial8250_port *p)
{
serial_write_reg(p, UART_OMAP_MDR1, 0x07);
serial_write_reg(p, UART_OMAP_SCR, 0x08);
serial_write_reg(p, UART_OMAP_MDR1, 0x00);
serial_write_reg(p, UART_OMAP_SYSC, (0x02 << 3) | (1 << 2) | (1 << 0));
}
void omap_serial_enable_clocks(int enable)
{
int i;
for (i = 0; i < OMAP_MAX_NR_PORTS; i++) {
if (uart_ick[i] && uart_fck[i]) {
if (enable) {
clk_enable(uart_ick[i]);
clk_enable(uart_fck[i]);
} else {
clk_disable(uart_ick[i]);
clk_disable(uart_fck[i]);
}
}
}
}
void __init omap_serial_init(void)
{
int i;
const struct omap_uart_config *info;
char name[16];
/*
* Make sure the serial ports are muxed on at this point.
* You have to mux them off in device drivers later on
* if not needed.
*/
info = omap_get_config(OMAP_TAG_UART, struct omap_uart_config);
if (info == NULL)
return;
for (i = 0; i < OMAP_MAX_NR_PORTS; i++) {
struct plat_serial8250_port *p = serial_platform_data + i;
if (!(info->enabled_uarts & (1 << i))) {
p->membase = NULL;
p->mapbase = 0;
continue;
}
sprintf(name, "uart%d_ick", i+1);
uart_ick[i] = clk_get(NULL, name);
if (IS_ERR(uart_ick[i])) {
printk(KERN_ERR "Could not get uart%d_ick\n", i+1);
uart_ick[i] = NULL;
} else
clk_enable(uart_ick[i]);
sprintf(name, "uart%d_fck", i+1);
uart_fck[i] = clk_get(NULL, name);
if (IS_ERR(uart_fck[i])) {
printk(KERN_ERR "Could not get uart%d_fck\n", i+1);
uart_fck[i] = NULL;
} else
clk_enable(uart_fck[i]);
omap_serial_reset(p);
}
}
static struct platform_device serial_device = {
.name = "serial8250",
.id = PLAT8250_DEV_PLATFORM,
.dev = {
.platform_data = serial_platform_data,
},
};
static int __init omap_init(void)
{
return platform_device_register(&serial_device);
}
arch_initcall(omap_init);
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