152 lines
3.6 KiB
C
152 lines
3.6 KiB
C
/* linux/drivers/serial/s3c2412.c
|
|
*
|
|
* Driver for Samsung S3C2412 and S3C2413 SoC onboard UARTs.
|
|
*
|
|
* Ben Dooks, Copyright (c) 2003-2005,2008 Simtec Electronics
|
|
* http://armlinux.simtec.co.uk/
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/io.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/init.h>
|
|
#include <linux/serial_core.h>
|
|
#include <linux/serial.h>
|
|
|
|
#include <asm/irq.h>
|
|
#include <asm/hardware.h>
|
|
|
|
#include <asm/plat-s3c/regs-serial.h>
|
|
#include <asm/arch/regs-gpio.h>
|
|
|
|
#include "samsung.h"
|
|
|
|
static int s3c2412_serial_setsource(struct uart_port *port,
|
|
struct s3c24xx_uart_clksrc *clk)
|
|
{
|
|
unsigned long ucon = rd_regl(port, S3C2410_UCON);
|
|
|
|
ucon &= ~S3C2412_UCON_CLKMASK;
|
|
|
|
if (strcmp(clk->name, "uclk") == 0)
|
|
ucon |= S3C2440_UCON_UCLK;
|
|
else if (strcmp(clk->name, "pclk") == 0)
|
|
ucon |= S3C2440_UCON_PCLK;
|
|
else if (strcmp(clk->name, "usysclk") == 0)
|
|
ucon |= S3C2412_UCON_USYSCLK;
|
|
else {
|
|
printk(KERN_ERR "unknown clock source %s\n", clk->name);
|
|
return -EINVAL;
|
|
}
|
|
|
|
wr_regl(port, S3C2410_UCON, ucon);
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int s3c2412_serial_getsource(struct uart_port *port,
|
|
struct s3c24xx_uart_clksrc *clk)
|
|
{
|
|
unsigned long ucon = rd_regl(port, S3C2410_UCON);
|
|
|
|
switch (ucon & S3C2412_UCON_CLKMASK) {
|
|
case S3C2412_UCON_UCLK:
|
|
clk->divisor = 1;
|
|
clk->name = "uclk";
|
|
break;
|
|
|
|
case S3C2412_UCON_PCLK:
|
|
case S3C2412_UCON_PCLK2:
|
|
clk->divisor = 1;
|
|
clk->name = "pclk";
|
|
break;
|
|
|
|
case S3C2412_UCON_USYSCLK:
|
|
clk->divisor = 1;
|
|
clk->name = "usysclk";
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int s3c2412_serial_resetport(struct uart_port *port,
|
|
struct s3c2410_uartcfg *cfg)
|
|
{
|
|
unsigned long ucon = rd_regl(port, S3C2410_UCON);
|
|
|
|
dbg("%s: port=%p (%08lx), cfg=%p\n",
|
|
__func__, port, port->mapbase, cfg);
|
|
|
|
/* ensure we don't change the clock settings... */
|
|
|
|
ucon &= S3C2412_UCON_CLKMASK;
|
|
|
|
wr_regl(port, S3C2410_UCON, ucon | cfg->ucon);
|
|
wr_regl(port, S3C2410_ULCON, cfg->ulcon);
|
|
|
|
/* reset both fifos */
|
|
|
|
wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
|
|
wr_regl(port, S3C2410_UFCON, cfg->ufcon);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct s3c24xx_uart_info s3c2412_uart_inf = {
|
|
.name = "Samsung S3C2412 UART",
|
|
.type = PORT_S3C2412,
|
|
.fifosize = 64,
|
|
.rx_fifomask = S3C2440_UFSTAT_RXMASK,
|
|
.rx_fifoshift = S3C2440_UFSTAT_RXSHIFT,
|
|
.rx_fifofull = S3C2440_UFSTAT_RXFULL,
|
|
.tx_fifofull = S3C2440_UFSTAT_TXFULL,
|
|
.tx_fifomask = S3C2440_UFSTAT_TXMASK,
|
|
.tx_fifoshift = S3C2440_UFSTAT_TXSHIFT,
|
|
.get_clksrc = s3c2412_serial_getsource,
|
|
.set_clksrc = s3c2412_serial_setsource,
|
|
.reset_port = s3c2412_serial_resetport,
|
|
};
|
|
|
|
/* device management */
|
|
|
|
static int s3c2412_serial_probe(struct platform_device *dev)
|
|
{
|
|
dbg("s3c2440_serial_probe: dev=%p\n", dev);
|
|
return s3c24xx_serial_probe(dev, &s3c2412_uart_inf);
|
|
}
|
|
|
|
static struct platform_driver s3c2412_serial_drv = {
|
|
.probe = s3c2412_serial_probe,
|
|
.remove = s3c24xx_serial_remove,
|
|
.driver = {
|
|
.name = "s3c2412-uart",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
s3c24xx_console_init(&s3c2412_serial_drv, &s3c2412_uart_inf);
|
|
|
|
static inline int s3c2412_serial_init(void)
|
|
{
|
|
return s3c24xx_serial_init(&s3c2412_serial_drv, &s3c2412_uart_inf);
|
|
}
|
|
|
|
static inline void s3c2412_serial_exit(void)
|
|
{
|
|
platform_driver_unregister(&s3c2412_serial_drv);
|
|
}
|
|
|
|
module_init(s3c2412_serial_init);
|
|
module_exit(s3c2412_serial_exit);
|
|
|
|
MODULE_DESCRIPTION("Samsung S3C2412,S3C2413 SoC Serial port driver");
|
|
MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_ALIAS("platform:s3c2412-uart");
|