1/*
  2 * Copyright (c) 2010 Samsung Electronics Co., Ltd.
  3 *		http://www.samsung.com/
  4 *
  5 * Based on drivers/serial/s3c6400.c
  6 *
  7 * Driver for Samsung S5PV210 SoC UARTs.
  8 *
  9 * This program is free software; you can redistribute it and/or modify
 10 * it under the terms of the GNU General Public License version 2 as
 11 * published by the Free Software Foundation.
 12*/
 13
 14#include <linux/module.h>
 15#include <linux/ioport.h>
 16#include <linux/io.h>
 17#include <linux/platform_device.h>
 18#include <linux/init.h>
 19#include <linux/serial_core.h>
 20#include <linux/serial.h>
 21#include <linux/delay.h>
 22
 23#include <asm/irq.h>
 24#include <mach/hardware.h>
 25#include <plat/regs-serial.h>
 26#include "samsung.h"
 27
 28static int s5pv210_serial_setsource(struct uart_port *port,
 29					struct s3c24xx_uart_clksrc *clk)
 30{
 31	struct s3c2410_uartcfg *cfg = port->dev->platform_data;
 32	unsigned long ucon = rd_regl(port, S3C2410_UCON);
 33
 34	if (cfg->flags & NO_NEED_CHECK_CLKSRC)
 35		return 0;
 36
 37	if (strcmp(clk->name, "pclk") == 0)
 38		ucon &= ~S5PV210_UCON_CLKMASK;
 39	else if (strcmp(clk->name, "uclk1") == 0)
 40		ucon |= S5PV210_UCON_CLKMASK;
 41	else {
 42		printk(KERN_ERR "unknown clock source %s\n", clk->name);
 43		return -EINVAL;
 44	}
 45
 46	wr_regl(port, S3C2410_UCON, ucon);
 47	return 0;
 48}
 49
 50
 51static int s5pv210_serial_getsource(struct uart_port *port,
 52					struct s3c24xx_uart_clksrc *clk)
 53{
 54	struct s3c2410_uartcfg *cfg = port->dev->platform_data;
 55	u32 ucon = rd_regl(port, S3C2410_UCON);
 56
 57	clk->divisor = 1;
 58
 59	if (cfg->flags & NO_NEED_CHECK_CLKSRC)
 60		return 0;
 61
 62	switch (ucon & S5PV210_UCON_CLKMASK) {
 63	case S5PV210_UCON_PCLK:
 64		clk->name = "pclk";
 65		break;
 66	case S5PV210_UCON_UCLK:
 67		clk->name = "uclk1";
 68		break;
 69	}
 70
 71	return 0;
 72}
 73
 74static int s5pv210_serial_resetport(struct uart_port *port,
 75					struct s3c2410_uartcfg *cfg)
 76{
 77	unsigned long ucon = rd_regl(port, S3C2410_UCON);
 78
 79	ucon &= S5PV210_UCON_CLKMASK;
 80	wr_regl(port, S3C2410_UCON,  ucon | cfg->ucon);
 81	wr_regl(port, S3C2410_ULCON, cfg->ulcon);
 82
 83	/* reset both fifos */
 84	wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
 85	wr_regl(port, S3C2410_UFCON, cfg->ufcon);
 86
 87	/* It is need to delay When reset FIFO register */
 88	udelay(1);
 89
 90	return 0;
 91}
 92
 93#define S5PV210_UART_DEFAULT_INFO(fifo_size)			\
 94		.name		= "Samsung S5PV210 UART0",	\
 95		.type		= PORT_S3C6400,			\
 96		.fifosize	= fifo_size,			\
 97		.has_divslot	= 1,				\
 98		.rx_fifomask	= S5PV210_UFSTAT_RXMASK,	\
 99		.rx_fifoshift	= S5PV210_UFSTAT_RXSHIFT,	\
100		.rx_fifofull	= S5PV210_UFSTAT_RXFULL,	\
101		.tx_fifofull	= S5PV210_UFSTAT_TXFULL,	\
102		.tx_fifomask	= S5PV210_UFSTAT_TXMASK,	\
103		.tx_fifoshift	= S5PV210_UFSTAT_TXSHIFT,	\
104		.get_clksrc	= s5pv210_serial_getsource,	\
105		.set_clksrc	= s5pv210_serial_setsource,	\
106		.reset_port	= s5pv210_serial_resetport
107
108static struct s3c24xx_uart_info s5p_port_fifo256 = {
109	S5PV210_UART_DEFAULT_INFO(256),
110};
111
112static struct s3c24xx_uart_info s5p_port_fifo64 = {
113	S5PV210_UART_DEFAULT_INFO(64),
114};
115
116static struct s3c24xx_uart_info s5p_port_fifo16 = {
117	S5PV210_UART_DEFAULT_INFO(16),
118};
119
120static struct s3c24xx_uart_info *s5p_uart_inf[] = {
121	[0] = &s5p_port_fifo256,
122	[1] = &s5p_port_fifo64,
123	[2] = &s5p_port_fifo16,
124	[3] = &s5p_port_fifo16,
125};
126
127/* device management */
128static int s5p_serial_probe(struct platform_device *pdev)
129{
130	return s3c24xx_serial_probe(pdev, s5p_uart_inf[pdev->id]);
131}
132
133static struct platform_driver s5p_serial_driver = {
134	.probe		= s5p_serial_probe,
135	.remove		= __devexit_p(s3c24xx_serial_remove),
136	.driver		= {
137		.name	= "s5pv210-uart",
138		.owner	= THIS_MODULE,
139	},
140};
141
142static int __init s5p_serial_init(void)
143{
144	return s3c24xx_serial_init(&s5p_serial_driver, *s5p_uart_inf);
145}
146
147static void __exit s5p_serial_exit(void)
148{
149	platform_driver_unregister(&s5p_serial_driver);
150}
151
152module_init(s5p_serial_init);
153module_exit(s5p_serial_exit);
154
155MODULE_LICENSE("GPL");
156MODULE_ALIAS("platform:s5pv210-uart");
157MODULE_DESCRIPTION("Samsung S5PV210 UART Driver support");
158MODULE_AUTHOR("Thomas Abraham <thomas.ab@samsung.com>");