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1 | /* linux/drivers/serial/s3c2412.c |
2 | * | |
3 | * Driver for Samsung S3C2412 and S3C2413 SoC onboard UARTs. | |
4 | * | |
5 | * Ben Dooks, Copyright (c) 2003-2005,2008 Simtec Electronics | |
6 | * http://armlinux.simtec.co.uk/ | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/module.h> | |
14 | #include <linux/ioport.h> | |
15 | #include <linux/io.h> | |
16 | #include <linux/platform_device.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/serial_core.h> | |
19 | #include <linux/serial.h> | |
20 | ||
21 | #include <asm/irq.h> | |
22 | #include <asm/hardware.h> | |
23 | ||
24 | #include <asm/plat-s3c/regs-serial.h> | |
25 | #include <asm/arch/regs-gpio.h> | |
26 | ||
27 | #include "samsung.h" | |
28 | ||
29 | static int s3c2412_serial_setsource(struct uart_port *port, | |
30 | struct s3c24xx_uart_clksrc *clk) | |
31 | { | |
32 | unsigned long ucon = rd_regl(port, S3C2410_UCON); | |
33 | ||
34 | ucon &= ~S3C2412_UCON_CLKMASK; | |
35 | ||
36 | if (strcmp(clk->name, "uclk") == 0) | |
37 | ucon |= S3C2440_UCON_UCLK; | |
38 | else if (strcmp(clk->name, "pclk") == 0) | |
39 | ucon |= S3C2440_UCON_PCLK; | |
40 | else if (strcmp(clk->name, "usysclk") == 0) | |
41 | ucon |= S3C2412_UCON_USYSCLK; | |
42 | else { | |
43 | printk(KERN_ERR "unknown clock source %s\n", clk->name); | |
44 | return -EINVAL; | |
45 | } | |
46 | ||
47 | wr_regl(port, S3C2410_UCON, ucon); | |
48 | return 0; | |
49 | } | |
50 | ||
51 | ||
52 | static int s3c2412_serial_getsource(struct uart_port *port, | |
53 | struct s3c24xx_uart_clksrc *clk) | |
54 | { | |
55 | unsigned long ucon = rd_regl(port, S3C2410_UCON); | |
56 | ||
57 | switch (ucon & S3C2412_UCON_CLKMASK) { | |
58 | case S3C2412_UCON_UCLK: | |
59 | clk->divisor = 1; | |
60 | clk->name = "uclk"; | |
61 | break; | |
62 | ||
63 | case S3C2412_UCON_PCLK: | |
64 | case S3C2412_UCON_PCLK2: | |
65 | clk->divisor = 1; | |
66 | clk->name = "pclk"; | |
67 | break; | |
68 | ||
69 | case S3C2412_UCON_USYSCLK: | |
70 | clk->divisor = 1; | |
71 | clk->name = "usysclk"; | |
72 | break; | |
73 | } | |
74 | ||
75 | return 0; | |
76 | } | |
77 | ||
78 | static int s3c2412_serial_resetport(struct uart_port *port, | |
79 | struct s3c2410_uartcfg *cfg) | |
80 | { | |
81 | unsigned long ucon = rd_regl(port, S3C2410_UCON); | |
82 | ||
83 | dbg("%s: port=%p (%08lx), cfg=%p\n", | |
84 | __func__, port, port->mapbase, cfg); | |
85 | ||
86 | /* ensure we don't change the clock settings... */ | |
87 | ||
88 | ucon &= S3C2412_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 | ||
101 | static struct s3c24xx_uart_info s3c2412_uart_inf = { | |
102 | .name = "Samsung S3C2412 UART", | |
103 | .type = PORT_S3C2412, | |
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 = s3c2412_serial_getsource, | |
112 | .set_clksrc = s3c2412_serial_setsource, | |
113 | .reset_port = s3c2412_serial_resetport, | |
114 | }; | |
115 | ||
116 | /* device management */ | |
117 | ||
118 | static int s3c2412_serial_probe(struct platform_device *dev) | |
119 | { | |
120 | dbg("s3c2440_serial_probe: dev=%p\n", dev); | |
121 | return s3c24xx_serial_probe(dev, &s3c2412_uart_inf); | |
122 | } | |
123 | ||
124 | static struct platform_driver s3c2412_serial_drv = { | |
125 | .probe = s3c2412_serial_probe, | |
126 | .remove = s3c24xx_serial_remove, | |
127 | .driver = { | |
128 | .name = "s3c2412-uart", | |
129 | .owner = THIS_MODULE, | |
130 | }, | |
131 | }; | |
132 | ||
133 | s3c24xx_console_init(&s3c2412_serial_drv, &s3c2412_uart_inf); | |
134 | ||
135 | static inline int s3c2412_serial_init(void) | |
136 | { | |
137 | return s3c24xx_serial_init(&s3c2412_serial_drv, &s3c2412_uart_inf); | |
138 | } | |
139 | ||
140 | static inline void s3c2412_serial_exit(void) | |
141 | { | |
142 | platform_driver_unregister(&s3c2412_serial_drv); | |
143 | } | |
144 | ||
145 | module_init(s3c2412_serial_init); | |
146 | module_exit(s3c2412_serial_exit); | |
147 | ||
148 | MODULE_DESCRIPTION("Samsung S3C2412,S3C2413 SoC Serial port driver"); | |
149 | MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>"); | |
150 | MODULE_LICENSE("GPL v2"); | |
151 | MODULE_ALIAS("platform:s3c2412-uart"); |