1 /*
2  * Copyright (C) 2012 ARM Ltd.
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License version 2 as
6  * published by the Free Software Foundation.
7  *
8  * This program is distributed in the hope that it will be useful,
9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11  * GNU General Public License for more details.
12  *
13  * You should have received a copy of the GNU General Public License
14  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
15  */
16 #ifndef __CLKSOURCE_ARM_ARCH_TIMER_H
17 #define __CLKSOURCE_ARM_ARCH_TIMER_H
18 
19 #include <linux/bitops.h>
20 #include <linux/timecounter.h>
21 #include <linux/types.h>
22 
23 #define ARCH_TIMER_TYPE_CP15		BIT(0)
24 #define ARCH_TIMER_TYPE_MEM		BIT(1)
25 
26 #define ARCH_TIMER_CTRL_ENABLE		(1 << 0)
27 #define ARCH_TIMER_CTRL_IT_MASK		(1 << 1)
28 #define ARCH_TIMER_CTRL_IT_STAT		(1 << 2)
29 
30 #define CNTHCTL_EL1PCTEN		(1 << 0)
31 #define CNTHCTL_EL1PCEN			(1 << 1)
32 #define CNTHCTL_EVNTEN			(1 << 2)
33 #define CNTHCTL_EVNTDIR			(1 << 3)
34 #define CNTHCTL_EVNTI			(0xF << 4)
35 
36 enum arch_timer_reg {
37 	ARCH_TIMER_REG_CTRL,
38 	ARCH_TIMER_REG_TVAL,
39 };
40 
41 enum arch_timer_ppi_nr {
42 	ARCH_TIMER_PHYS_SECURE_PPI,
43 	ARCH_TIMER_PHYS_NONSECURE_PPI,
44 	ARCH_TIMER_VIRT_PPI,
45 	ARCH_TIMER_HYP_PPI,
46 	ARCH_TIMER_MAX_TIMER_PPI
47 };
48 
49 enum arch_timer_spi_nr {
50 	ARCH_TIMER_PHYS_SPI,
51 	ARCH_TIMER_VIRT_SPI,
52 	ARCH_TIMER_MAX_TIMER_SPI
53 };
54 
55 #define ARCH_TIMER_PHYS_ACCESS		0
56 #define ARCH_TIMER_VIRT_ACCESS		1
57 #define ARCH_TIMER_MEM_PHYS_ACCESS	2
58 #define ARCH_TIMER_MEM_VIRT_ACCESS	3
59 
60 #define ARCH_TIMER_MEM_MAX_FRAMES	8
61 
62 #define ARCH_TIMER_USR_PCT_ACCESS_EN	(1 << 0) /* physical counter */
63 #define ARCH_TIMER_USR_VCT_ACCESS_EN	(1 << 1) /* virtual counter */
64 #define ARCH_TIMER_VIRT_EVT_EN		(1 << 2)
65 #define ARCH_TIMER_EVT_TRIGGER_SHIFT	(4)
66 #define ARCH_TIMER_EVT_TRIGGER_MASK	(0xF << ARCH_TIMER_EVT_TRIGGER_SHIFT)
67 #define ARCH_TIMER_USR_VT_ACCESS_EN	(1 << 8) /* virtual timer registers */
68 #define ARCH_TIMER_USR_PT_ACCESS_EN	(1 << 9) /* physical timer registers */
69 
70 #define ARCH_TIMER_EVT_STREAM_PERIOD_US	100
71 #define ARCH_TIMER_EVT_STREAM_FREQ				\
72 	(USEC_PER_SEC / ARCH_TIMER_EVT_STREAM_PERIOD_US)
73 
74 struct arch_timer_kvm_info {
75 	struct timecounter timecounter;
76 	int virtual_irq;
77 };
78 
79 struct arch_timer_mem_frame {
80 	bool valid;
81 	phys_addr_t cntbase;
82 	size_t size;
83 	int phys_irq;
84 	int virt_irq;
85 };
86 
87 struct arch_timer_mem {
88 	phys_addr_t cntctlbase;
89 	size_t size;
90 	struct arch_timer_mem_frame frame[ARCH_TIMER_MEM_MAX_FRAMES];
91 };
92 
93 #ifdef CONFIG_ARM_ARCH_TIMER
94 
95 extern u32 arch_timer_get_rate(void);
96 extern u64 (*arch_timer_read_counter)(void);
97 extern struct arch_timer_kvm_info *arch_timer_get_kvm_info(void);
98 extern bool arch_timer_evtstrm_available(void);
99 
100 #else
101 
arch_timer_get_rate(void)102 static inline u32 arch_timer_get_rate(void)
103 {
104 	return 0;
105 }
106 
arch_timer_read_counter(void)107 static inline u64 arch_timer_read_counter(void)
108 {
109 	return 0;
110 }
111 
arch_timer_evtstrm_available(void)112 static inline bool arch_timer_evtstrm_available(void)
113 {
114 	return false;
115 }
116 
117 #endif
118 
119 #endif
120