Merge branch 'tty-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6
[linux-2.6.git] / drivers / tty / serial / s5pv210.c
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
28 static 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
51 static 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
74 static 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
108 static struct s3c24xx_uart_info s5p_port_fifo256 = {
109         S5PV210_UART_DEFAULT_INFO(256),
110 };
111
112 static struct s3c24xx_uart_info s5p_port_fifo64 = {
113         S5PV210_UART_DEFAULT_INFO(64),
114 };
115
116 static struct s3c24xx_uart_info s5p_port_fifo16 = {
117         S5PV210_UART_DEFAULT_INFO(16),
118 };
119
120 static 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 */
128 static int s5p_serial_probe(struct platform_device *pdev)
129 {
130         return s3c24xx_serial_probe(pdev, s5p_uart_inf[pdev->id]);
131 }
132
133 static 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
142 static int __init s5p_serial_init(void)
143 {
144         return s3c24xx_serial_init(&s5p_serial_driver, *s5p_uart_inf);
145 }
146
147 static void __exit s5p_serial_exit(void)
148 {
149         platform_driver_unregister(&s5p_serial_driver);
150 }
151
152 module_init(s5p_serial_init);
153 module_exit(s5p_serial_exit);
154
155 MODULE_LICENSE("GPL");
156 MODULE_ALIAS("platform:s5pv210-uart");
157 MODULE_DESCRIPTION("Samsung S5PV210 UART Driver support");
158 MODULE_AUTHOR("Thomas Abraham <thomas.ab@samsung.com>");