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