xref: /openbmc/linux/arch/mips/cobalt/serial.c (revision 3dc4b6fb)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *  Registration of Cobalt UART platform device.
4  *
5  *  Copyright (C) 2007  Yoichi Yuasa <yuasa@linux-mips.org>
6  */
7 #include <linux/errno.h>
8 #include <linux/init.h>
9 #include <linux/ioport.h>
10 #include <linux/platform_device.h>
11 #include <linux/serial_8250.h>
12 
13 #include <cobalt.h>
14 #include <irq.h>
15 
16 static struct resource cobalt_uart_resource[] __initdata = {
17 	{
18 		.start	= 0x1c800000,
19 		.end	= 0x1c800007,
20 		.flags	= IORESOURCE_MEM,
21 	},
22 	{
23 		.start	= SERIAL_IRQ,
24 		.end	= SERIAL_IRQ,
25 		.flags	= IORESOURCE_IRQ,
26 	},
27 };
28 
29 static struct plat_serial8250_port cobalt_serial8250_port[] = {
30 	{
31 		.irq		= SERIAL_IRQ,
32 		.uartclk	= 18432000,
33 		.iotype		= UPIO_MEM,
34 		.flags		= UPF_IOREMAP | UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
35 		.mapbase	= 0x1c800000,
36 	},
37 	{},
38 };
39 
40 static __init int cobalt_uart_add(void)
41 {
42 	struct platform_device *pdev;
43 	int retval;
44 
45 	/*
46 	 * Cobalt Qube1 has no UART.
47 	 */
48 	if (cobalt_board_id == COBALT_BRD_ID_QUBE1)
49 		return 0;
50 
51 	pdev = platform_device_alloc("serial8250", -1);
52 	if (!pdev)
53 		return -ENOMEM;
54 
55 	pdev->id = PLAT8250_DEV_PLATFORM;
56 	pdev->dev.platform_data = cobalt_serial8250_port;
57 
58 	retval = platform_device_add_resources(pdev, cobalt_uart_resource, ARRAY_SIZE(cobalt_uart_resource));
59 	if (retval)
60 		goto err_free_device;
61 
62 	retval = platform_device_add(pdev);
63 	if (retval)
64 		goto err_free_device;
65 
66 	return 0;
67 
68 err_free_device:
69 	platform_device_put(pdev);
70 
71 	return retval;
72 }
73 device_initcall(cobalt_uart_add);
74