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gerrit-public.fairphone.software / kernel / msm-4.9 / 1a8a27c974d0f09c61874b81bf9670f1478b649a / . / drivers / serial / s3c6400.c
blob: 06936d13393f1192f0278fc6dc00e66736f3796c [file] [log] [blame]
Ben Dooksb690ace2008-10-21 14:07:03 +0100[diff] [blame]1/* linux/drivers/serial/s3c6400.c
2 *
3 * Driver for Samsung S3C6400 and S3C6410 SoC onboard UARTs.
4 *
5 * Copyright 2008 Openmoko, Inc.
6 * Copyright 2008 Simtec Electronics
7 * Ben Dooks <ben@simtec.co.uk>
8 * http://armlinux.simtec.co.uk/
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13*/
14
15#include <linux/module.h>
16#include <linux/ioport.h>
17#include <linux/io.h>
18#include <linux/platform_device.h>
19#include <linux/init.h>
20#include <linux/serial_core.h>
21#include <linux/serial.h>
22
23#include <asm/irq.h>
24#include <mach/hardware.h>
25
26#include <plat/regs-serial.h>
27
28#include "samsung.h"
29
30static int s3c6400_serial_setsource(struct uart_port *port,
31 struct s3c24xx_uart_clksrc *clk)
32{
33 unsigned long ucon = rd_regl(port, S3C2410_UCON);
34
35 if (strcmp(clk->name, "uclk0") == 0) {
36 ucon &= ~S3C6400_UCON_CLKMASK;
37 ucon |= S3C6400_UCON_UCLK0;
38 } else if (strcmp(clk->name, "uclk1") == 0)
39 ucon |= S3C6400_UCON_UCLK1;
40 else if (strcmp(clk->name, "pclk") == 0) {
41 /* See notes about transitioning from UCLK to PCLK */
42 ucon &= ~S3C6400_UCON_UCLK0;
43 } else {
44 printk(KERN_ERR "unknown clock source %s\n", clk->name);
45 return -EINVAL;
46 }
47
48 wr_regl(port, S3C2410_UCON, ucon);
49 return 0;
50}
51
52
53static int s3c6400_serial_getsource(struct uart_port *port,
54 struct s3c24xx_uart_clksrc *clk)
55{
56 u32 ucon = rd_regl(port, S3C2410_UCON);
57
58 clk->divisor = 1;
59
60 switch (ucon & S3C6400_UCON_CLKMASK) {
61 case S3C6400_UCON_UCLK0:
62 clk->name = "uclk0";
63 break;
64
65 case S3C6400_UCON_UCLK1:
66 clk->name = "uclk1";
67 break;
68
69 case S3C6400_UCON_PCLK:
70 case S3C6400_UCON_PCLK2:
71 clk->name = "pclk";
72 break;
73 }
74
75 return 0;
76}
77
78static int s3c6400_serial_resetport(struct uart_port *port,
79 struct s3c2410_uartcfg *cfg)
80{
81 unsigned long ucon = rd_regl(port, S3C2410_UCON);
82
83 dbg("s3c6400_serial_resetport: port=%p (%08lx), cfg=%p\n",
84 port, port->mapbase, cfg);
85
86 /* ensure we don't change the clock settings... */
87
88 ucon &= S3C6400_UCON_CLKMASK;
89
90 wr_regl(port, S3C2410_UCON, ucon | cfg->ucon);
91 wr_regl(port, S3C2410_ULCON, cfg->ulcon);
92
93 /* reset both fifos */
94
95 wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
96 wr_regl(port, S3C2410_UFCON, cfg->ufcon);
97
98 return 0;
99}
100
101static struct s3c24xx_uart_info s3c6400_uart_inf = {
102 .name = "Samsung S3C6400 UART",
103 .type = PORT_S3C6400,
104 .fifosize = 64,
105 .rx_fifomask = S3C2440_UFSTAT_RXMASK,
106 .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT,
107 .rx_fifofull = S3C2440_UFSTAT_RXFULL,
108 .tx_fifofull = S3C2440_UFSTAT_TXFULL,
109 .tx_fifomask = S3C2440_UFSTAT_TXMASK,
110 .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT,
111 .get_clksrc = s3c6400_serial_getsource,
112 .set_clksrc = s3c6400_serial_setsource,
113 .reset_port = s3c6400_serial_resetport,
114};
115
116/* device management */
117
118static int s3c6400_serial_probe(struct platform_device *dev)
119{
120 dbg("s3c6400_serial_probe: dev=%p\n", dev);
121 return s3c24xx_serial_probe(dev, &s3c6400_uart_inf);
122}
123
124static struct platform_driver s3c6400_serial_drv = {
125 .probe = s3c6400_serial_probe,
126 .remove = s3c24xx_serial_remove,
127 .driver = {
128 .name = "s3c6400-uart",
129 .owner = THIS_MODULE,
130 },
131};
132
133s3c24xx_console_init(&s3c6400_serial_drv, &s3c6400_uart_inf);
134
135static int __init s3c6400_serial_init(void)
136{
137 return s3c24xx_serial_init(&s3c6400_serial_drv, &s3c6400_uart_inf);
138}
139
140static void __exit s3c6400_serial_exit(void)
141{
142 platform_driver_unregister(&s3c6400_serial_drv);
143}
144
145module_init(s3c6400_serial_init);
146module_exit(s3c6400_serial_exit);
147
148MODULE_DESCRIPTION("Samsung S3C6400,S3C6410 SoC Serial port driver");
149MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
150MODULE_LICENSE("GPL v2");
151MODULE_ALIAS("platform:s3c6400-uart");