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 UPF_MAGIC_MULTIPLIER, \
38 .regshift = 0, \
39 }
40
41 #define CBUS_UART_FLAGS (UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_IOREMAP)
42
43 static struct plat_serial8250_port uart8250_data[] = {
44 SMC_PORT(0x3F8, 4),
45 SMC_PORT(0x2F8, 3),
46 #ifndef CONFIG_MIPS_CMP
47 {
48 .mapbase = 0x1f000900, /* The CBUS UART */
49 .irq = MIPS_CPU_IRQ_BASE + MIPSCPU_INT_MB2,
50 .uartclk = 3686400, /* Twice the usual clk! */
51 .iotype = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) ?
52 UPIO_MEM32BE : UPIO_MEM32,
53 .flags = CBUS_UART_FLAGS,
54 .regshift = 3,
55 },
56 #endif
57 { },
58 };
59
60 static struct platform_device malta_uart8250_device = {
61 .name = "serial8250",
62 .id = PLAT8250_DEV_PLATFORM,
63 .dev = {
64 .platform_data = uart8250_data,
65 },
66 };
67
68 static struct platform_device *malta_devices[] __initdata = {
69 &malta_uart8250_device,
70 };
71
malta_add_devices(void)72 static int __init malta_add_devices(void)
73 {
74 return platform_add_devices(malta_devices, ARRAY_SIZE(malta_devices));
75 }
76
77 device_initcall(malta_add_devices);
78