tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1/* linux/drivers/serial/s5pv210.c
2 *
3 * Copyright (c) 2010 Samsung Electronics Co., Ltd.
4 * http://www.samsung.com/
5 *
6 * Based on drivers/serial/s3c6400.c
7 *
8 * Driver for Samsung S5PV210 SoC UARTs.
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#include <plat/regs-serial.h>
26#include "samsung.h"
27
28static int s5pv210_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, "pclk") == 0)
34 ucon &= ~S5PV210_UCON_CLKMASK;
35 else if (strcmp(clk->name, "uclk1") == 0)
36 ucon |= S5PV210_UCON_CLKMASK;
37 else {
38 printk(KERN_ERR "unknown clock source %s\n", clk->name);
39 return -EINVAL;
40 }
41
42 wr_regl(port, S3C2410_UCON, ucon);
43 return 0;
44}
45
46
47static int s5pv210_serial_getsource(struct uart_port *port,
48 struct s3c24xx_uart_clksrc *clk)
49{
50 u32 ucon = rd_regl(port, S3C2410_UCON);
51
52 clk->divisor = 1;
53
54 switch (ucon & S5PV210_UCON_CLKMASK) {
55 case S5PV210_UCON_PCLK:
56 clk->name = "pclk";
57 break;
58 case S5PV210_UCON_UCLK:
59 clk->name = "uclk1";
60 break;
61 }
62
63 return 0;
64}
65
66static int s5pv210_serial_resetport(struct uart_port *port,
67 struct s3c2410_uartcfg *cfg)
68{
69 unsigned long ucon = rd_regl(port, S3C2410_UCON);
70
71 ucon &= S5PV210_UCON_CLKMASK;
72 wr_regl(port, S3C2410_UCON, ucon | cfg->ucon);
73 wr_regl(port, S3C2410_ULCON, cfg->ulcon);
74
75 /* reset both fifos */
76 wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
77 wr_regl(port, S3C2410_UFCON, cfg->ufcon);
78
79 return 0;
80}
81
82#define S5PV210_UART_DEFAULT_INFO(fifo_size) \
83 .name = "Samsung S5PV210 UART0", \
84 .type = PORT_S3C6400, \
85 .fifosize = fifo_size, \
86 .has_divslot = 1, \
87 .rx_fifomask = S5PV210_UFSTAT_RXMASK, \
88 .rx_fifoshift = S5PV210_UFSTAT_RXSHIFT, \
89 .rx_fifofull = S5PV210_UFSTAT_RXFULL, \
90 .tx_fifofull = S5PV210_UFSTAT_TXFULL, \
91 .tx_fifomask = S5PV210_UFSTAT_TXMASK, \
92 .tx_fifoshift = S5PV210_UFSTAT_TXSHIFT, \
93 .get_clksrc = s5pv210_serial_getsource, \
94 .set_clksrc = s5pv210_serial_setsource, \
95 .reset_port = s5pv210_serial_resetport
96
97static struct s3c24xx_uart_info s5p_port_fifo256 = {
98 S5PV210_UART_DEFAULT_INFO(256),
99};
100
101static struct s3c24xx_uart_info s5p_port_fifo64 = {
102 S5PV210_UART_DEFAULT_INFO(64),
103};
104
105static struct s3c24xx_uart_info s5p_port_fifo16 = {
106 S5PV210_UART_DEFAULT_INFO(16),
107};
108
109static struct s3c24xx_uart_info *s5p_uart_inf[] = {
110 [0] = &s5p_port_fifo256,
111 [1] = &s5p_port_fifo64,
112 [2] = &s5p_port_fifo16,
113 [3] = &s5p_port_fifo16,
114};
115
116/* device management */
117static int s5p_serial_probe(struct platform_device *pdev)
118{
119 return s3c24xx_serial_probe(pdev, s5p_uart_inf[pdev->id]);
120}
121
122static struct platform_driver s5p_serial_driver = {
123 .probe = s5p_serial_probe,
124 .remove = __devexit_p(s3c24xx_serial_remove),
125 .driver = {
126 .name = "s5pv210-uart",
127 .owner = THIS_MODULE,
128 },
129};
130
131static int __init s5pv210_serial_console_init(void)
132{
133 return s3c24xx_serial_initconsole(&s5p_serial_driver, s5p_uart_inf);
134}
135
136console_initcall(s5pv210_serial_console_init);
137
138static int __init s5p_serial_init(void)
139{
140 return s3c24xx_serial_init(&s5p_serial_driver, *s5p_uart_inf);
141}
142
143static void __exit s5p_serial_exit(void)
144{
145 platform_driver_unregister(&s5p_serial_driver);
146}
147
148module_init(s5p_serial_init);
149module_exit(s5p_serial_exit);
150
151MODULE_LICENSE("GPL");
152MODULE_ALIAS("platform:s5pv210-uart");
153MODULE_DESCRIPTION("Samsung S5PV210 UART Driver support");
154MODULE_AUTHOR("Thomas Abraham <thomas.ab@samsung.com>");