1/*
  2 * Driver for Samsung S3C2410 SoC onboard UARTs.
  3 *
  4 * Ben Dooks, Copyright (c) 2003-2008 Simtec Electronics
  5 *	http://armlinux.simtec.co.uk/
  6 *
  7 * This program is free software; you can redistribute it and/or modify
  8 * it under the terms of the GNU General Public License version 2 as
  9 * published by the Free Software Foundation.
 10*/
 11
 12#include <linux/module.h>
 13#include <linux/ioport.h>
 14#include <linux/io.h>
 15#include <linux/platform_device.h>
 16#include <linux/init.h>
 17#include <linux/serial_core.h>
 18#include <linux/serial.h>
 19
 20#include <asm/irq.h>
 21#include <mach/hardware.h>
 22
 23#include <plat/regs-serial.h>
 24#include <mach/regs-gpio.h>
 25
 26#include "samsung.h"
 27
 28static int s3c2410_serial_setsource(struct uart_port *port,
 29				    struct s3c24xx_uart_clksrc *clk)
 30{
 31	unsigned long ucon = rd_regl(port, S3C2410_UCON);
 32
 33	if (strcmp(clk->name, "uclk") == 0)
 34		ucon |= S3C2410_UCON_UCLK;
 35	else
 36		ucon &= ~S3C2410_UCON_UCLK;
 37
 38	wr_regl(port, S3C2410_UCON, ucon);
 39	return 0;
 40}
 41
 42static int s3c2410_serial_getsource(struct uart_port *port,
 43				    struct s3c24xx_uart_clksrc *clk)
 44{
 45	unsigned long ucon = rd_regl(port, S3C2410_UCON);
 46
 47	clk->divisor = 1;
 48	clk->name = (ucon & S3C2410_UCON_UCLK) ? "uclk" : "pclk";
 49
 50	return 0;
 51}
 52
 53static int s3c2410_serial_resetport(struct uart_port *port,
 54				    struct s3c2410_uartcfg *cfg)
 55{
 56	dbg("s3c2410_serial_resetport: port=%p (%08lx), cfg=%p\n",
 57	    port, port->mapbase, cfg);
 58
 59	wr_regl(port, S3C2410_UCON,  cfg->ucon);
 60	wr_regl(port, S3C2410_ULCON, cfg->ulcon);
 61
 62	/* reset both fifos */
 63
 64	wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
 65	wr_regl(port, S3C2410_UFCON, cfg->ufcon);
 66
 67	return 0;
 68}
 69
 70static struct s3c24xx_uart_info s3c2410_uart_inf = {
 71	.name		= "Samsung S3C2410 UART",
 72	.type		= PORT_S3C2410,
 73	.fifosize	= 16,
 74	.rx_fifomask	= S3C2410_UFSTAT_RXMASK,
 75	.rx_fifoshift	= S3C2410_UFSTAT_RXSHIFT,
 76	.rx_fifofull	= S3C2410_UFSTAT_RXFULL,
 77	.tx_fifofull	= S3C2410_UFSTAT_TXFULL,
 78	.tx_fifomask	= S3C2410_UFSTAT_TXMASK,
 79	.tx_fifoshift	= S3C2410_UFSTAT_TXSHIFT,
 80	.get_clksrc	= s3c2410_serial_getsource,
 81	.set_clksrc	= s3c2410_serial_setsource,
 82	.reset_port	= s3c2410_serial_resetport,
 83};
 84
 85static int s3c2410_serial_probe(struct platform_device *dev)
 86{
 87	return s3c24xx_serial_probe(dev, &s3c2410_uart_inf);
 88}
 89
 90static struct platform_driver s3c2410_serial_driver = {
 91	.probe		= s3c2410_serial_probe,
 92	.remove		= __devexit_p(s3c24xx_serial_remove),
 93	.driver		= {
 94		.name	= "s3c2410-uart",
 95		.owner	= THIS_MODULE,
 96	},
 97};
 98
 99static int __init s3c2410_serial_init(void)
100{
101	return s3c24xx_serial_init(&s3c2410_serial_driver, &s3c2410_uart_inf);
102}
103
104static void __exit s3c2410_serial_exit(void)
105{
106	platform_driver_unregister(&s3c2410_serial_driver);
107}
108
109module_init(s3c2410_serial_init);
110module_exit(s3c2410_serial_exit);
111
112MODULE_LICENSE("GPL v2");
113MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
114MODULE_DESCRIPTION("Samsung S3C2410 SoC Serial port driver");
115MODULE_ALIAS("platform:s3c2410-uart");