summaryrefslogtreecommitdiffstats
path: root/arch/arc/include/asm/serial.h
blob: 602b0970a764b7e3aca7d6902f86106461f14c3f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
/*
 * Copyright (C) 2012 Synopsys, Inc. (www.synopsys.com)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#ifndef _ASM_ARC_SERIAL_H
#define _ASM_ARC_SERIAL_H

/*
 * early-8250 requires BASE_BAUD to be defined and includes this header.
 * We put in a typical value:
 * 	(core clk / 16) - i.e. UART samples 16 times per sec.
 * Athough in multi-platform-image this might not work, specially if the
 * clk driving the UART is different.
 * We can't use DeviceTree as this is typically for early serial.
 */

#include <asm/clk.h>

#define BASE_BAUD	(arc_get_core_freq() / 16)

/*
 * This is definitely going to break early 8250 consoles on multi-platform
 * images but hey, it won't add any code complexity for a debug feature of
 * one broken driver.
 */
#ifdef CONFIG_ARC_PLAT_TB10X
#undef BASE_BAUD
#define BASE_BAUD	(arc_get_core_freq() / 16 / 3)
#endif

#endif /* _ASM_ARC_SERIAL_H */
OpenPOWER on IntegriCloud