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d8512731 TA |
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 | ||
28 | static 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 | ||
47 | static 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 | ||
66 | static 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 | ||
97 | static struct s3c24xx_uart_info s5p_port_fifo256 = { | |
98 | S5PV210_UART_DEFAULT_INFO(256), | |
99 | }; | |
100 | ||
101 | static struct s3c24xx_uart_info s5p_port_fifo64 = { | |
102 | S5PV210_UART_DEFAULT_INFO(64), | |
103 | }; | |
104 | ||
105 | static struct s3c24xx_uart_info s5p_port_fifo16 = { | |
106 | S5PV210_UART_DEFAULT_INFO(16), | |
107 | }; | |
108 | ||
109 | static 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 */ | |
117 | static int s5p_serial_probe(struct platform_device *pdev) | |
118 | { | |
119 | return s3c24xx_serial_probe(pdev, s5p_uart_inf[pdev->id]); | |
120 | } | |
121 | ||
5d66ceee | 122 | static struct platform_driver s5p_serial_driver = { |
d8512731 TA |
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 | ||
131 | static int __init s5pv210_serial_console_init(void) | |
132 | { | |
5d66ceee | 133 | return s3c24xx_serial_initconsole(&s5p_serial_driver, s5p_uart_inf); |
d8512731 TA |
134 | } |
135 | ||
136 | console_initcall(s5pv210_serial_console_init); | |
137 | ||
138 | static int __init s5p_serial_init(void) | |
139 | { | |
5d66ceee | 140 | return s3c24xx_serial_init(&s5p_serial_driver, *s5p_uart_inf); |
d8512731 TA |
141 | } |
142 | ||
143 | static void __exit s5p_serial_exit(void) | |
144 | { | |
5d66ceee | 145 | platform_driver_unregister(&s5p_serial_driver); |
d8512731 TA |
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>"); |