tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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");