2 * Copyright (c) 2010 Samsung Electronics Co., Ltd.
3 * http://www.samsung.com/
5 * Based on drivers/serial/s3c6400.c
7 * Driver for Samsung S5PV210 SoC UARTs.
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.
14 #include <linux/module.h>
15 #include <linux/ioport.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>
24 #include <mach/hardware.h>
25 #include <plat/regs-serial.h>
28 static int s5pv210_serial_setsource(struct uart_port *port,
29 struct s3c24xx_uart_clksrc *clk)
31 struct s3c2410_uartcfg *cfg = port->dev->platform_data;
32 unsigned long ucon = rd_regl(port, S3C2410_UCON);
34 if (cfg->flags & NO_NEED_CHECK_CLKSRC)
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;
42 printk(KERN_ERR "unknown clock source %s\n", clk->name);
46 wr_regl(port, S3C2410_UCON, ucon);
51 static int s5pv210_serial_getsource(struct uart_port *port,
52 struct s3c24xx_uart_clksrc *clk)
54 struct s3c2410_uartcfg *cfg = port->dev->platform_data;
55 u32 ucon = rd_regl(port, S3C2410_UCON);
59 if (cfg->flags & NO_NEED_CHECK_CLKSRC)
62 switch (ucon & S5PV210_UCON_CLKMASK) {
63 case S5PV210_UCON_PCLK:
66 case S5PV210_UCON_UCLK:
74 static int s5pv210_serial_resetport(struct uart_port *port,
75 struct s3c2410_uartcfg *cfg)
77 unsigned long ucon = rd_regl(port, S3C2410_UCON);
79 ucon &= S5PV210_UCON_CLKMASK;
80 wr_regl(port, S3C2410_UCON, ucon | cfg->ucon);
81 wr_regl(port, S3C2410_ULCON, cfg->ulcon);
83 /* reset both fifos */
84 wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
85 wr_regl(port, S3C2410_UFCON, cfg->ufcon);
87 wr_regl(port, S3C64XX_UINTM, 0xf);
88 wr_regl(port, S3C64XX_UINTP, 0xf);
90 /* It is need to delay when reset FIFO register */
96 #define S5PV210_UART_DEFAULT_INFO(fifo_size) \
97 .name = "Samsung S5PV210 UART0", \
98 .type = PORT_S3C6400, \
99 .fifosize = fifo_size, \
101 .rx_fifomask = S5PV210_UFSTAT_RXMASK, \
102 .rx_fifoshift = S5PV210_UFSTAT_RXSHIFT, \
103 .rx_fifofull = S5PV210_UFSTAT_RXFULL, \
104 .tx_fifofull = S5PV210_UFSTAT_TXFULL, \
105 .tx_fifomask = S5PV210_UFSTAT_TXMASK, \
106 .tx_fifoshift = S5PV210_UFSTAT_TXSHIFT, \
107 .get_clksrc = s5pv210_serial_getsource, \
108 .set_clksrc = s5pv210_serial_setsource, \
109 .reset_port = s5pv210_serial_resetport
111 static struct s3c24xx_uart_info s5p_port_fifo256 = {
112 S5PV210_UART_DEFAULT_INFO(256),
115 static struct s3c24xx_uart_info s5p_port_fifo64 = {
116 S5PV210_UART_DEFAULT_INFO(64),
119 static struct s3c24xx_uart_info s5p_port_fifo16 = {
120 S5PV210_UART_DEFAULT_INFO(16),
123 static struct s3c24xx_uart_info *s5p_uart_inf[] = {
124 [0] = &s5p_port_fifo256,
125 [1] = &s5p_port_fifo64,
126 [2] = &s5p_port_fifo16,
127 [3] = &s5p_port_fifo16,
130 /* device management */
131 static int s5p_serial_probe(struct platform_device *pdev)
133 return s3c24xx_serial_probe(pdev, s5p_uart_inf[pdev->id]);
136 static struct platform_driver s5p_serial_driver = {
137 .probe = s5p_serial_probe,
138 .remove = __devexit_p(s3c24xx_serial_remove),
140 .name = "s5pv210-uart",
141 .owner = THIS_MODULE,
145 static int __init s5p_serial_init(void)
147 return s3c24xx_serial_init(&s5p_serial_driver, *s5p_uart_inf);
150 static void __exit s5p_serial_exit(void)
152 platform_driver_unregister(&s5p_serial_driver);
155 module_init(s5p_serial_init);
156 module_exit(s5p_serial_exit);
158 MODULE_LICENSE("GPL");
159 MODULE_ALIAS("platform:s5pv210-uart");
160 MODULE_DESCRIPTION("Samsung S5PV210 UART Driver support");
161 MODULE_AUTHOR("Thomas Abraham <thomas.ab@samsung.com>");