1 /* linux/drivers/serial/s3c2410.c
2 *
3 * Driver for Samsung S3C2410 SoC onboard UARTs.
4 *
5 * Ben Dooks, Copyright (c) 2003-2005,2008 Simtec Electronics
6 * http://armlinux.simtec.co.uk/
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13 #include <linux/module.h>
14 #include <linux/ioport.h>
15 #include <linux/io.h>
16 #include <linux/platform_device.h>
17 #include <linux/init.h>
18 #include <linux/serial_core.h>
19 #include <linux/serial.h>
20
21 #include <asm/irq.h>
22 #include <mach/hardware.h>
23
24 #include <plat/regs-serial.h>
25 #include <mach/regs-gpio.h>
26
27 #include "samsung.h"
28
29 static int s3c2410_serial_setsource(struct uart_port *port,
30 struct s3c24xx_uart_clksrc *clk)
31 {
32 unsigned long ucon = rd_regl(port, S3C2410_UCON);
33
34 if (strcmp(clk->name, "uclk") == 0)
35 ucon |= S3C2410_UCON_UCLK;
36 else
37 ucon &= ~S3C2410_UCON_UCLK;
38
39 wr_regl(port, S3C2410_UCON, ucon);
40 return 0;
41 }
42
43 static int s3c2410_serial_getsource(struct uart_port *port,
44 struct s3c24xx_uart_clksrc *clk)
45 {
46 unsigned long ucon = rd_regl(port, S3C2410_UCON);
47
48 clk->divisor = 1;
49 clk->name = (ucon & S3C2410_UCON_UCLK) ? "uclk" : "pclk";
50
51 return 0;
52 }
53
54 static int s3c2410_serial_resetport(struct uart_port *port,
55 struct s3c2410_uartcfg *cfg)
56 {
57 dbg("s3c2410_serial_resetport: port=%p (%08lx), cfg=%p\n",
58 port, port->mapbase, cfg);
59
60 wr_regl(port, S3C2410_UCON, cfg->ucon);
61 wr_regl(port, S3C2410_ULCON, cfg->ulcon);
62
63 /* reset both fifos */
64
65 wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
66 wr_regl(port, S3C2410_UFCON, cfg->ufcon);
67
68 return 0;
69 }
70
71 static struct s3c24xx_uart_info s3c2410_uart_inf = {
72 .name = "Samsung S3C2410 UART",
73 .type = PORT_S3C2410,
74 .fifosize = 16,
75 .rx_fifomask = S3C2410_UFSTAT_RXMASK,
76 .rx_fifoshift = S3C2410_UFSTAT_RXSHIFT,
77 .rx_fifofull = S3C2410_UFSTAT_RXFULL,
78 .tx_fifofull = S3C2410_UFSTAT_TXFULL,
79 .tx_fifomask = S3C2410_UFSTAT_TXMASK,
80 .tx_fifoshift = S3C2410_UFSTAT_TXSHIFT,
81 .get_clksrc = s3c2410_serial_getsource,
82 .set_clksrc = s3c2410_serial_setsource,
83 .reset_port = s3c2410_serial_resetport,
84 };
85
86 static int s3c2410_serial_probe(struct platform_device *dev)
87 {
88 return s3c24xx_serial_probe(dev, &s3c2410_uart_inf);
89 }
90
91 static struct platform_driver s3c2410_serial_driver = {
92 .probe = s3c2410_serial_probe,
93 .remove = __devexit_p(s3c24xx_serial_remove),
94 .driver = {
95 .name = "s3c2410-uart",
96 .owner = THIS_MODULE,
97 },
98 };
99
100 s3c24xx_console_init(&s3c2410_serial_driver, &s3c2410_uart_inf);
101
102 static int __init s3c2410_serial_init(void)
103 {
104 return s3c24xx_serial_init(&s3c2410_serial_driver, &s3c2410_uart_inf);
105 }
106
107 static void __exit s3c2410_serial_exit(void)
108 {
109 platform_driver_unregister(&s3c2410_serial_driver);
110 }
111
112 module_init(s3c2410_serial_init);
113 module_exit(s3c2410_serial_exit);
114
115 MODULE_LICENSE("GPL v2");
116 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
117 MODULE_DESCRIPTION("Samsung S3C2410 SoC Serial port driver");
118 MODULE_ALIAS("platform:s3c2410-uart");
119
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