8dd160c96e873f66f2657d444d4ddbc53ab5c8e0
[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
22 #include <asm/irq.h>
23 #include <mach/hardware.h>
24 #include <plat/regs-serial.h>
25 #include "samsung.h"
26
27 static int s5pv210_serial_setsource(struct uart_port *port,
28                                         struct s3c24xx_uart_clksrc *clk)
29 {
30         struct s3c2410_uartcfg *cfg = port->dev->platform_data;
31         unsigned long ucon = rd_regl(port, S3C2410_UCON);
32
33         if (cfg->flags & NO_NEED_CHECK_CLKSRC)
34                 return 0;
35
36         if (strcmp(clk->name, "pclk") == 0)
37                 ucon &= ~S5PV210_UCON_CLKMASK;
38         else if (strcmp(clk->name, "uclk1") == 0)
39                 ucon |= S5PV210_UCON_CLKMASK;
40         else {
41                 printk(KERN_ERR "unknown clock source %s\n", clk->name);
42                 return -EINVAL;
43         }
44
45         wr_regl(port, S3C2410_UCON, ucon);
46         return 0;
47 }
48
49
50 static int s5pv210_serial_getsource(struct uart_port *port,
51                                         struct s3c24xx_uart_clksrc *clk)
52 {
53         struct s3c2410_uartcfg *cfg = port->dev->platform_data;
54         u32 ucon = rd_regl(port, S3C2410_UCON);
55
56         clk->divisor = 1;
57
58         if (cfg->flags & NO_NEED_CHECK_CLKSRC)
59                 return 0;
60
61         switch (ucon & S5PV210_UCON_CLKMASK) {
62         case S5PV210_UCON_PCLK:
63                 clk->name = "pclk";
64                 break;
65         case S5PV210_UCON_UCLK:
66                 clk->name = "uclk1";
67                 break;
68         }
69
70         return 0;
71 }
72
73 static int s5pv210_serial_resetport(struct uart_port *port,
74                                         struct s3c2410_uartcfg *cfg)
75 {
76         unsigned long ucon = rd_regl(port, S3C2410_UCON);
77
78         ucon &= S5PV210_UCON_CLKMASK;
79         wr_regl(port, S3C2410_UCON,  ucon | cfg->ucon);
80         wr_regl(port, S3C2410_ULCON, cfg->ulcon);
81
82         /* reset both fifos */
83         wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
84         wr_regl(port, S3C2410_UFCON, cfg->ufcon);
85
86         return 0;
87 }
88
89 #define S5PV210_UART_DEFAULT_INFO(fifo_size)                    \
90                 .name           = "Samsung S5PV210 UART0",      \
91                 .type           = PORT_S3C6400,                 \
92                 .fifosize       = fifo_size,                    \
93                 .has_divslot    = 1,                            \
94                 .rx_fifomask    = S5PV210_UFSTAT_RXMASK,        \
95                 .rx_fifoshift   = S5PV210_UFSTAT_RXSHIFT,       \
96                 .rx_fifofull    = S5PV210_UFSTAT_RXFULL,        \
97                 .tx_fifofull    = S5PV210_UFSTAT_TXFULL,        \
98                 .tx_fifomask    = S5PV210_UFSTAT_TXMASK,        \
99                 .tx_fifoshift   = S5PV210_UFSTAT_TXSHIFT,       \
100                 .get_clksrc     = s5pv210_serial_getsource,     \
101                 .set_clksrc     = s5pv210_serial_setsource,     \
102                 .reset_port     = s5pv210_serial_resetport
103
104 static struct s3c24xx_uart_info s5p_port_fifo256 = {
105         S5PV210_UART_DEFAULT_INFO(256),
106 };
107
108 static struct s3c24xx_uart_info s5p_port_fifo64 = {
109         S5PV210_UART_DEFAULT_INFO(64),
110 };
111
112 static struct s3c24xx_uart_info s5p_port_fifo16 = {
113         S5PV210_UART_DEFAULT_INFO(16),
114 };
115
116 static struct s3c24xx_uart_info *s5p_uart_inf[] = {
117         [0] = &s5p_port_fifo256,
118         [1] = &s5p_port_fifo64,
119         [2] = &s5p_port_fifo16,
120         [3] = &s5p_port_fifo16,
121 };
122
123 /* device management */
124 static int s5p_serial_probe(struct platform_device *pdev)
125 {
126         return s3c24xx_serial_probe(pdev, s5p_uart_inf[pdev->id]);
127 }
128
129 static struct platform_driver s5p_serial_driver = {
130         .probe          = s5p_serial_probe,
131         .remove         = __devexit_p(s3c24xx_serial_remove),
132         .driver         = {
133                 .name   = "s5pv210-uart",
134                 .owner  = THIS_MODULE,
135         },
136 };
137
138 static int __init s5p_serial_init(void)
139 {
140         return s3c24xx_serial_init(&s5p_serial_driver, *s5p_uart_inf);
141 }
142
143 static void __exit s5p_serial_exit(void)
144 {
145         platform_driver_unregister(&s5p_serial_driver);
146 }
147
148 module_init(s5p_serial_init);
149 module_exit(s5p_serial_exit);
150
151 MODULE_LICENSE("GPL");
152 MODULE_ALIAS("platform:s5pv210-uart");
153 MODULE_DESCRIPTION("Samsung S5PV210 UART Driver support");
154 MODULE_AUTHOR("Thomas Abraham <thomas.ab@samsung.com>");