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1 | /* linux/drivers/serial/s3c2440.c |
2 | * | |
3 | * Driver for Samsung S3C2440 and S3C2442 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 | ||
30 | static int s3c2440_serial_setsource(struct uart_port *port, | |
31 | struct s3c24xx_uart_clksrc *clk) | |
32 | { | |
33 | unsigned long ucon = rd_regl(port, S3C2410_UCON); | |
34 | ||
35 | /* todo - proper fclk<>nonfclk switch. */ | |
36 | ||
37 | ucon &= ~S3C2440_UCON_CLKMASK; | |
38 | ||
39 | if (strcmp(clk->name, "uclk") == 0) | |
40 | ucon |= S3C2440_UCON_UCLK; | |
41 | else if (strcmp(clk->name, "pclk") == 0) | |
42 | ucon |= S3C2440_UCON_PCLK; | |
43 | else if (strcmp(clk->name, "fclk") == 0) | |
44 | ucon |= S3C2440_UCON_FCLK; | |
45 | else { | |
46 | printk(KERN_ERR "unknown clock source %s\n", clk->name); | |
47 | return -EINVAL; | |
48 | } | |
49 | ||
50 | wr_regl(port, S3C2410_UCON, ucon); | |
51 | return 0; | |
52 | } | |
53 | ||
54 | ||
55 | static int s3c2440_serial_getsource(struct uart_port *port, | |
56 | struct s3c24xx_uart_clksrc *clk) | |
57 | { | |
58 | unsigned long ucon = rd_regl(port, S3C2410_UCON); | |
59 | unsigned long ucon0, ucon1, ucon2; | |
60 | ||
61 | switch (ucon & S3C2440_UCON_CLKMASK) { | |
62 | case S3C2440_UCON_UCLK: | |
63 | clk->divisor = 1; | |
64 | clk->name = "uclk"; | |
65 | break; | |
66 | ||
67 | case S3C2440_UCON_PCLK: | |
68 | case S3C2440_UCON_PCLK2: | |
69 | clk->divisor = 1; | |
70 | clk->name = "pclk"; | |
71 | break; | |
72 | ||
73 | case S3C2440_UCON_FCLK: | |
74 | /* the fun of calculating the uart divisors on | |
75 | * the s3c2440 */ | |
76 | ||
77 | ucon0 = __raw_readl(S3C24XX_VA_UART0 + S3C2410_UCON); | |
78 | ucon1 = __raw_readl(S3C24XX_VA_UART1 + S3C2410_UCON); | |
79 | ucon2 = __raw_readl(S3C24XX_VA_UART2 + S3C2410_UCON); | |
80 | ||
81 | printk("ucons: %08lx, %08lx, %08lx\n", ucon0, ucon1, ucon2); | |
82 | ||
83 | ucon0 &= S3C2440_UCON0_DIVMASK; | |
84 | ucon1 &= S3C2440_UCON1_DIVMASK; | |
85 | ucon2 &= S3C2440_UCON2_DIVMASK; | |
86 | ||
87 | if (ucon0 != 0) { | |
88 | clk->divisor = ucon0 >> S3C2440_UCON_DIVSHIFT; | |
89 | clk->divisor += 6; | |
90 | } else if (ucon1 != 0) { | |
91 | clk->divisor = ucon1 >> S3C2440_UCON_DIVSHIFT; | |
92 | clk->divisor += 21; | |
93 | } else if (ucon2 != 0) { | |
94 | clk->divisor = ucon2 >> S3C2440_UCON_DIVSHIFT; | |
95 | clk->divisor += 36; | |
96 | } else { | |
97 | /* manual calims 44, seems to be 9 */ | |
98 | clk->divisor = 9; | |
99 | } | |
100 | ||
101 | clk->name = "fclk"; | |
102 | break; | |
103 | } | |
104 | ||
105 | return 0; | |
106 | } | |
107 | ||
108 | static int s3c2440_serial_resetport(struct uart_port *port, | |
109 | struct s3c2410_uartcfg *cfg) | |
110 | { | |
111 | unsigned long ucon = rd_regl(port, S3C2410_UCON); | |
112 | ||
113 | dbg("s3c2440_serial_resetport: port=%p (%08lx), cfg=%p\n", | |
114 | port, port->mapbase, cfg); | |
115 | ||
116 | /* ensure we don't change the clock settings... */ | |
117 | ||
118 | ucon &= (S3C2440_UCON0_DIVMASK | (3<<10)); | |
119 | ||
120 | wr_regl(port, S3C2410_UCON, ucon | cfg->ucon); | |
121 | wr_regl(port, S3C2410_ULCON, cfg->ulcon); | |
122 | ||
123 | /* reset both fifos */ | |
124 | ||
125 | wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH); | |
126 | wr_regl(port, S3C2410_UFCON, cfg->ufcon); | |
127 | ||
128 | return 0; | |
129 | } | |
130 | ||
131 | static struct s3c24xx_uart_info s3c2440_uart_inf = { | |
132 | .name = "Samsung S3C2440 UART", | |
133 | .type = PORT_S3C2440, | |
134 | .fifosize = 64, | |
135 | .rx_fifomask = S3C2440_UFSTAT_RXMASK, | |
136 | .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT, | |
137 | .rx_fifofull = S3C2440_UFSTAT_RXFULL, | |
138 | .tx_fifofull = S3C2440_UFSTAT_TXFULL, | |
139 | .tx_fifomask = S3C2440_UFSTAT_TXMASK, | |
140 | .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT, | |
141 | .get_clksrc = s3c2440_serial_getsource, | |
142 | .set_clksrc = s3c2440_serial_setsource, | |
143 | .reset_port = s3c2440_serial_resetport, | |
144 | }; | |
145 | ||
146 | /* device management */ | |
147 | ||
148 | static int s3c2440_serial_probe(struct platform_device *dev) | |
149 | { | |
150 | dbg("s3c2440_serial_probe: dev=%p\n", dev); | |
151 | return s3c24xx_serial_probe(dev, &s3c2440_uart_inf); | |
152 | } | |
153 | ||
154 | static struct platform_driver s3c2440_serial_drv = { | |
155 | .probe = s3c2440_serial_probe, | |
156 | .remove = s3c24xx_serial_remove, | |
157 | .driver = { | |
158 | .name = "s3c2440-uart", | |
159 | .owner = THIS_MODULE, | |
160 | }, | |
161 | }; | |
162 | ||
163 | s3c24xx_console_init(&s3c2440_serial_drv, &s3c2440_uart_inf); | |
164 | ||
165 | static int __init s3c2440_serial_init(void) | |
166 | { | |
167 | return s3c24xx_serial_init(&s3c2440_serial_drv, &s3c2440_uart_inf); | |
168 | } | |
169 | ||
170 | static void __exit s3c2440_serial_exit(void) | |
171 | { | |
172 | platform_driver_unregister(&s3c2440_serial_drv); | |
173 | } | |
174 | ||
175 | module_init(s3c2440_serial_init); | |
176 | module_exit(s3c2440_serial_exit); | |
177 | ||
178 | MODULE_DESCRIPTION("Samsung S3C2440,S3C2442 SoC Serial port driver"); | |
179 | MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>"); | |
180 | MODULE_LICENSE("GPLi v2"); | |
181 | MODULE_ALIAS("platform:s3c2440-uart"); |