xref: /openbmc/linux/arch/mips/cobalt/serial.c (revision b3fd7368f8f60bc9a7ffc2a5311db5f4dbd42180)
1  /*
2   *  Registration of Cobalt UART platform device.
3   *
4   *  Copyright (C) 2007  Yoichi Yuasa <yuasa@linux-mips.org>
5   *
6   *  This program is free software; you can redistribute it and/or modify
7   *  it under the terms of the GNU General Public License as published by
8   *  the Free Software Foundation; either version 2 of the License, or
9   *  (at your option) any later version.
10   *
11   *  This program is distributed in the hope that it will be useful,
12   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
13   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14   *  GNU General Public License for more details.
15   *
16   *  You should have received a copy of the GNU General Public License
17   *  along with this program; if not, write to the Free Software
18   *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
19   */
20  #include <linux/errno.h>
21  #include <linux/init.h>
22  #include <linux/ioport.h>
23  #include <linux/platform_device.h>
24  #include <linux/serial_8250.h>
25  
26  #include <cobalt.h>
27  #include <irq.h>
28  
29  static struct resource cobalt_uart_resource[] __initdata = {
30  	{
31  		.start	= 0x1c800000,
32  		.end	= 0x1c800007,
33  		.flags	= IORESOURCE_MEM,
34  	},
35  	{
36  		.start	= SERIAL_IRQ,
37  		.end	= SERIAL_IRQ,
38  		.flags	= IORESOURCE_IRQ,
39  	},
40  };
41  
42  static struct plat_serial8250_port cobalt_serial8250_port[] = {
43  	{
44  		.irq		= SERIAL_IRQ,
45  		.uartclk	= 18432000,
46  		.iotype		= UPIO_MEM,
47  		.flags		= UPF_IOREMAP | UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
48  		.mapbase	= 0x1c800000,
49  	},
50  	{},
51  };
52  
53  static __init int cobalt_uart_add(void)
54  {
55  	struct platform_device *pdev;
56  	int retval;
57  
58  	/*
59  	 * Cobalt Qube1 has no UART.
60  	 */
61  	if (cobalt_board_id == COBALT_BRD_ID_QUBE1)
62  		return 0;
63  
64  	pdev = platform_device_alloc("serial8250", -1);
65  	if (!pdev)
66  		return -ENOMEM;
67  
68  	pdev->id = PLAT8250_DEV_PLATFORM;
69  	pdev->dev.platform_data = cobalt_serial8250_port;
70  
71  	retval = platform_device_add_resources(pdev, cobalt_uart_resource, ARRAY_SIZE(cobalt_uart_resource));
72  	if (retval)
73  		goto err_free_device;
74  
75  	retval = platform_device_add(pdev);
76  	if (retval)
77  		goto err_free_device;
78  
79  	return 0;
80  
81  err_free_device:
82  	platform_device_put(pdev);
83  
84  	return retval;
85  }
86  device_initcall(cobalt_uart_add);
87