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) 2006, 07 MIPS Technologies, Inc.
7  *   written by Ralf Baechle (ralf@linux-mips.org)
8  *     written by Ralf Baechle <ralf@linux-mips.org>
9  *
10  * Copyright (C) 2008 Wind River Systems, Inc.
11  *   updated by Tiejun Chen <tiejun.chen@windriver.com>
12  *
13  * 1. Probe driver for the Malta's UART ports:
14  *
15  *   o 2 ports in the SMC SuperIO
16  *   o 1 port in the CBUS UART, a discrete 16550 which normally is only used
17  *     for bringups.
18  *
19  * We don't use 8250_platform.c on Malta as it would result in the CBUS
20  * UART becoming ttyS0.
21  *
22  * 2. Register RTC-CMOS platform device on Malta.
23  */
24 #include <linux/init.h>
25 #include <linux/serial_8250.h>
26 #include <linux/irq.h>
27 #include <linux/platform_device.h>
28 #include <asm/mips-boards/maltaint.h>
29 
30 #define SMC_PORT(base, int)						\
31 {									\
32 	.iobase		= base,						\
33 	.irq		= int,						\
34 	.uartclk	= 1843200,					\
35 	.iotype		= UPIO_PORT,					\
36 	.flags		= UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,		\
37 	.regshift	= 0,						\
38 }
39 
40 #define CBUS_UART_FLAGS (UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_IOREMAP)
41 
42 static struct plat_serial8250_port uart8250_data[] = {
43 	SMC_PORT(0x3F8, 4),
44 	SMC_PORT(0x2F8, 3),
45 #ifndef CONFIG_MIPS_CMP
46 	{
47 		.mapbase	= 0x1f000900,	/* The CBUS UART */
48 		.irq		= MIPS_CPU_IRQ_BASE + MIPSCPU_INT_MB2,
49 		.uartclk	= 3686400,	/* Twice the usual clk! */
50 		.iotype		= UPIO_MEM32,
51 		.flags		= CBUS_UART_FLAGS,
52 		.regshift	= 3,
53 	},
54 #endif
55 	{ },
56 };
57 
58 static struct platform_device malta_uart8250_device = {
59 	.name			= "serial8250",
60 	.id			= PLAT8250_DEV_PLATFORM,
61 	.dev			= {
62 		.platform_data	= uart8250_data,
63 	},
64 };
65 
66 static struct platform_device *malta_devices[] __initdata = {
67 	&malta_uart8250_device,
68 };
69 
70 static int __init malta_add_devices(void)
71 {
72 	return platform_add_devices(malta_devices, ARRAY_SIZE(malta_devices));
73 }
74 
75 device_initcall(malta_add_devices);
76