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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) 2001 - 2013 Tensilica Inc.
7  */
8 
9 #ifndef _XTENSA_TIMEX_H
10 #define _XTENSA_TIMEX_H
11 
12 #include <asm/processor.h>
13 #include <linux/stringify.h>
14 
15 #define _INTLEVEL(x)	XCHAL_INT ## x ## _LEVEL
16 #define INTLEVEL(x)	_INTLEVEL(x)
17 
18 #if XCHAL_NUM_TIMERS > 0 && \
19 	INTLEVEL(XCHAL_TIMER0_INTERRUPT) <= XCHAL_EXCM_LEVEL
20 # define LINUX_TIMER     0
21 # define LINUX_TIMER_INT XCHAL_TIMER0_INTERRUPT
22 #elif XCHAL_NUM_TIMERS > 1 && \
23 	INTLEVEL(XCHAL_TIMER1_INTERRUPT) <= XCHAL_EXCM_LEVEL
24 # define LINUX_TIMER     1
25 # define LINUX_TIMER_INT XCHAL_TIMER1_INTERRUPT
26 #elif XCHAL_NUM_TIMERS > 2 && \
27 	INTLEVEL(XCHAL_TIMER2_INTERRUPT) <= XCHAL_EXCM_LEVEL
28 # define LINUX_TIMER     2
29 # define LINUX_TIMER_INT XCHAL_TIMER2_INTERRUPT
30 #else
31 # error "Bad timer number for Linux configurations!"
32 #endif
33 
34 extern unsigned long ccount_freq;
35 
36 typedef unsigned long long cycles_t;
37 
38 #define get_cycles()	(0)
39 
40 void local_timer_setup(unsigned cpu);
41 
42 /*
43  * Register access.
44  */
45 
46 #define WSR_CCOUNT(r)	  asm volatile ("wsr %0, ccount" :: "a" (r))
47 #define RSR_CCOUNT(r)	  asm volatile ("rsr %0, ccount" : "=a" (r))
48 #define WSR_CCOMPARE(x,r) asm volatile ("wsr %0,"__stringify(SREG_CCOMPARE)"+"__stringify(x) :: "a"(r))
49 #define RSR_CCOMPARE(x,r) asm volatile ("rsr %0,"__stringify(SREG_CCOMPARE)"+"__stringify(x) : "=a"(r))
50 
get_ccount(void)51 static inline unsigned long get_ccount (void)
52 {
53 	unsigned long ccount;
54 	RSR_CCOUNT(ccount);
55 	return ccount;
56 }
57 
set_ccount(unsigned long ccount)58 static inline void set_ccount (unsigned long ccount)
59 {
60 	WSR_CCOUNT(ccount);
61 }
62 
get_linux_timer(void)63 static inline unsigned long get_linux_timer (void)
64 {
65 	unsigned ccompare;
66 	RSR_CCOMPARE(LINUX_TIMER, ccompare);
67 	return ccompare;
68 }
69 
set_linux_timer(unsigned long ccompare)70 static inline void set_linux_timer (unsigned long ccompare)
71 {
72 	WSR_CCOMPARE(LINUX_TIMER, ccompare);
73 }
74 
75 #endif	/* _XTENSA_TIMEX_H */
76