1 /*
2  * This file is subject to the terms and conditions of the GNU General Public
3  * License.  See the file "COPYING" in the main directory of this archive
4  * for more details.
5  *
6  * Copyright (C) 2007 MIPS Technologies, Inc.
7  *   written by Ralf Baechle (ralf@linux-mips.org)
8  *
9  * Probe driver for the Malta's UART ports:
10  *
11  *   o 2 ports in the SMC SuperIO
12  *   o 1 port in the CBUS UART, a discrete 16550 which normally is only used
13  *     for bringups.
14  *
15  * We don't use 8250_platform.c on Malta as it would result in the CBUS
16  * UART becoming ttyS0.
17  */
18 #include <linux/module.h>
19 #include <linux/init.h>
20 #include <linux/serial_8250.h>
21 
22 #define SMC_PORT(base, int)						\
23 {									\
24 	.iobase		= base,						\
25 	.irq		= int,						\
26 	.uartclk	= 1843200,					\
27 	.iotype		= UPIO_PORT,					\
28 	.flags		= UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,		\
29 	.regshift	= 0,						\
30 }
31 
32 #define CBUS_UART_FLAGS (UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_IOREMAP)
33 
34 static struct plat_serial8250_port uart8250_data[] = {
35 	SMC_PORT(0x3F8, 4),
36 	SMC_PORT(0x2F8, 3),
37 	{
38 		.mapbase	= 0x1f000900,	/* The CBUS UART */
39 		.irq		= MIPS_CPU_IRQ_BASE + 2,
40 		.uartclk	= 3686400,	/* Twice the usual clk! */
41 		.iotype		= UPIO_MEM32,
42 		.flags		= CBUS_UART_FLAGS,
43 		.regshift	= 3,
44 	},
45 	{ },
46 };
47 
48 static struct platform_device uart8250_device = {
49 	.name			= "serial8250",
50 	.id			= PLAT8250_DEV_PLATFORM2,
51 	.dev			= {
52 		.platform_data	= uart8250_data,
53 	},
54 };
55 
56 static int __init uart8250_init(void)
57 {
58 	return platform_device_register(&uart8250_device);
59 }
60 
61 module_init(uart8250_init);
62 
63 MODULE_AUTHOR("Ralf Baechle <ralf@linux-mips.org>");
64 MODULE_LICENSE("GPL");
65 MODULE_DESCRIPTION("8250 UART probe driver for the Malta CBUS UART");
66