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1 | /* linux/drivers/serial/s3c24a0.c |
2 | * |
3 | * Driver for Samsung S3C24A0 SoC onboard UARTs. |
4 | * |
5 | * Based on drivers/serial/s3c2410.c |
6 | * |
7 | * Author: Sandeep Patil <sandeep.patil@azingo.com> |
8 | * |
9 | * Ben Dooks, Copyright (c) 2003-2008 Simtec Electronics |
10 | * http://armlinux.simtec.co.uk/ |
11 | * |
12 | * This program is free software; you can redistribute it and/or modify |
13 | * it under the terms of the GNU General Public License version 2 as |
14 | * published by the Free Software Foundation. |
15 | */ |
16 | |
17 | #include <linux/module.h> |
18 | #include <linux/ioport.h> |
19 | #include <linux/platform_device.h> |
20 | #include <linux/init.h> |
21 | #include <linux/serial_core.h> |
22 | #include <linux/serial.h> |
23 | #include <linux/io.h> |
24 | #include <linux/irq.h> |
25 | |
26 | #include <mach/hardware.h> |
27 | |
28 | #include <plat/regs-serial.h> |
29 | #include <mach/regs-gpio.h> |
30 | |
31 | #include "samsung.h" |
32 | |
33 | static int s3c24a0_serial_setsource(struct uart_port *port, |
34 | struct s3c24xx_uart_clksrc *clk) |
35 | { |
36 | unsigned long ucon = rd_regl(port, S3C2410_UCON); |
37 | |
38 | if (strcmp(clk->name, "uclk") == 0) |
39 | ucon |= S3C2410_UCON_UCLK; |
40 | else |
41 | ucon &= ~S3C2410_UCON_UCLK; |
42 | |
43 | wr_regl(port, S3C2410_UCON, ucon); |
44 | return 0; |
45 | } |
46 | |
47 | static int s3c24a0_serial_getsource(struct uart_port *port, |
48 | struct s3c24xx_uart_clksrc *clk) |
49 | { |
50 | unsigned long ucon = rd_regl(port, S3C2410_UCON); |
51 | |
52 | clk->divisor = 1; |
53 | clk->name = (ucon & S3C2410_UCON_UCLK) ? "uclk" : "pclk"; |
54 | |
55 | return 0; |
56 | } |
57 | |
58 | static int s3c24a0_serial_resetport(struct uart_port *port, |
59 | struct s3c2410_uartcfg *cfg) |
60 | { |
61 | dbg("s3c24a0_serial_resetport: port=%p (%08lx), cfg=%p\n", |
62 | port, port->mapbase, cfg); |
63 | |
64 | wr_regl(port, S3C2410_UCON, cfg->ucon); |
65 | wr_regl(port, S3C2410_ULCON, cfg->ulcon); |
66 | |
67 | /* reset both fifos */ |
68 | |
69 | wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH); |
70 | wr_regl(port, S3C2410_UFCON, cfg->ufcon); |
71 | |
72 | return 0; |
73 | } |
74 | |
75 | static struct s3c24xx_uart_info s3c24a0_uart_inf = { |
76 | .name = "Samsung S3C24A0 UART", |
77 | .type = PORT_S3C2410, |
78 | .fifosize = 16, |
79 | .rx_fifomask = S3C24A0_UFSTAT_RXMASK, |
80 | .rx_fifoshift = S3C24A0_UFSTAT_RXSHIFT, |
81 | .rx_fifofull = S3C24A0_UFSTAT_RXFULL, |
82 | .tx_fifofull = S3C24A0_UFSTAT_TXFULL, |
83 | .tx_fifomask = S3C24A0_UFSTAT_TXMASK, |
84 | .tx_fifoshift = S3C24A0_UFSTAT_TXSHIFT, |
85 | .get_clksrc = s3c24a0_serial_getsource, |
86 | .set_clksrc = s3c24a0_serial_setsource, |
87 | .reset_port = s3c24a0_serial_resetport, |
88 | }; |
89 | |
90 | static int s3c24a0_serial_probe(struct platform_device *dev) |
91 | { |
92 | return s3c24xx_serial_probe(dev, &s3c24a0_uart_inf); |
93 | } |
94 | |
95 | static struct platform_driver s3c24a0_serial_driver = { |
96 | .probe = s3c24a0_serial_probe, |
97 | .remove = __devexit_p(s3c24xx_serial_remove), |
98 | .driver = { |
99 | .name = "s3c24a0-uart", |
100 | .owner = THIS_MODULE, |
101 | }, |
102 | }; |
103 | |
104 | s3c24xx_console_init(&s3c24a0_serial_driver, &s3c24a0_uart_inf); |
105 | |
106 | static int __init s3c24a0_serial_init(void) |
107 | { |
108 | return s3c24xx_serial_init(&s3c24a0_serial_driver, &s3c24a0_uart_inf); |
109 | } |
110 | |
111 | static void __exit s3c24a0_serial_exit(void) |
112 | { |
113 | platform_driver_unregister(&s3c24a0_serial_driver); |
114 | } |
115 | |
116 | module_init(s3c24a0_serial_init); |
117 | module_exit(s3c24a0_serial_exit); |
118 | |
119 |
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