Linux Kernel  3.7.1
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earlycons.c
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1 /*
2  * Copyright 2003-2011 NetLogic Microsystems, Inc. (NetLogic). All rights
3  * reserved.
4  *
5  * This software is available to you under a choice of one of two
6  * licenses. You may choose to be licensed under the terms of the GNU
7  * General Public License (GPL) Version 2, available from the file
8  * COPYING in the main directory of this source tree, or the NetLogic
9  * license below:
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  *
15  * 1. Redistributions of source code must retain the above copyright
16  * notice, this list of conditions and the following disclaimer.
17  * 2. Redistributions in binary form must reproduce the above copyright
18  * notice, this list of conditions and the following disclaimer in
19  * the documentation and/or other materials provided with the
20  * distribution.
21  *
22  * THIS SOFTWARE IS PROVIDED BY NETLOGIC ``AS IS'' AND ANY EXPRESS OR
23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
24  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25  * ARE DISCLAIMED. IN NO EVENT SHALL NETLOGIC OR CONTRIBUTORS BE LIABLE
26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
29  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
30  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
31  * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
32  * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33  */
34 
35 #include <linux/types.h>
36 #include <linux/serial_reg.h>
37 
38 #include <asm/mipsregs.h>
39 #include <asm/netlogic/haldefs.h>
40 
41 #if defined(CONFIG_CPU_XLP)
44 #elif defined(CONFIG_CPU_XLR)
45 #include <asm/netlogic/xlr/iomap.h>
46 #endif
47 
48 void prom_putchar(char c)
49 {
50  uint64_t uartbase;
51 
52 #if defined(CONFIG_CPU_XLP)
53  uartbase = nlm_get_uart_regbase(0, 0);
54 #elif defined(CONFIG_CPU_XLR)
55  uartbase = nlm_mmio_base(NETLOGIC_IO_UART_0_OFFSET);
56 #endif
57  while ((nlm_read_reg(uartbase, UART_LSR) & UART_LSR_THRE) == 0)
58  ;
59  nlm_write_reg(uartbase, UART_TX, c);
60 }