1 /*
2  * arch/arm64/include/asm/arch_gicv3.h
3  *
4  * Copyright (C) 2015 ARM Ltd.
5  *
6  * This program is free software: you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
17  */
18 #ifndef __ASM_ARCH_GICV3_H
19 #define __ASM_ARCH_GICV3_H
20 
21 #include <asm/sysreg.h>
22 
23 #ifndef __ASSEMBLY__
24 
25 #include <linux/stringify.h>
26 #include <asm/barrier.h>
27 #include <asm/cacheflush.h>
28 
29 #define read_gicreg(r)			read_sysreg_s(SYS_ ## r)
30 #define write_gicreg(v, r)		write_sysreg_s(v, SYS_ ## r)
31 
32 /*
33  * Low-level accessors
34  *
35  * These system registers are 32 bits, but we make sure that the compiler
36  * sets the GP register's most significant bits to 0 with an explicit cast.
37  */
38 
39 static inline void gic_write_eoir(u32 irq)
40 {
41 	write_sysreg_s(irq, SYS_ICC_EOIR1_EL1);
42 	isb();
43 }
44 
45 static inline void gic_write_dir(u32 irq)
46 {
47 	write_sysreg_s(irq, SYS_ICC_DIR_EL1);
48 	isb();
49 }
50 
51 static inline u64 gic_read_iar_common(void)
52 {
53 	u64 irqstat;
54 
55 	irqstat = read_sysreg_s(SYS_ICC_IAR1_EL1);
56 	dsb(sy);
57 	return irqstat;
58 }
59 
60 /*
61  * Cavium ThunderX erratum 23154
62  *
63  * The gicv3 of ThunderX requires a modified version for reading the
64  * IAR status to ensure data synchronization (access to icc_iar1_el1
65  * is not sync'ed before and after).
66  */
67 static inline u64 gic_read_iar_cavium_thunderx(void)
68 {
69 	u64 irqstat;
70 
71 	nops(8);
72 	irqstat = read_sysreg_s(SYS_ICC_IAR1_EL1);
73 	nops(4);
74 	mb();
75 
76 	return irqstat;
77 }
78 
79 static inline void gic_write_ctlr(u32 val)
80 {
81 	write_sysreg_s(val, SYS_ICC_CTLR_EL1);
82 	isb();
83 }
84 
85 static inline u32 gic_read_ctlr(void)
86 {
87 	return read_sysreg_s(SYS_ICC_CTLR_EL1);
88 }
89 
90 static inline void gic_write_grpen1(u32 val)
91 {
92 	write_sysreg_s(val, SYS_ICC_IGRPEN1_EL1);
93 	isb();
94 }
95 
96 static inline void gic_write_sgi1r(u64 val)
97 {
98 	write_sysreg_s(val, SYS_ICC_SGI1R_EL1);
99 }
100 
101 static inline u32 gic_read_sre(void)
102 {
103 	return read_sysreg_s(SYS_ICC_SRE_EL1);
104 }
105 
106 static inline void gic_write_sre(u32 val)
107 {
108 	write_sysreg_s(val, SYS_ICC_SRE_EL1);
109 	isb();
110 }
111 
112 static inline void gic_write_bpr1(u32 val)
113 {
114 	write_sysreg_s(val, SYS_ICC_BPR1_EL1);
115 }
116 
117 #define gic_read_typer(c)		readq_relaxed(c)
118 #define gic_write_irouter(v, c)		writeq_relaxed(v, c)
119 #define gic_read_lpir(c)		readq_relaxed(c)
120 #define gic_write_lpir(v, c)		writeq_relaxed(v, c)
121 
122 #define gic_flush_dcache_to_poc(a,l)	__flush_dcache_area((a), (l))
123 
124 #define gits_read_baser(c)		readq_relaxed(c)
125 #define gits_write_baser(v, c)		writeq_relaxed(v, c)
126 
127 #define gits_read_cbaser(c)		readq_relaxed(c)
128 #define gits_write_cbaser(v, c)		writeq_relaxed(v, c)
129 
130 #define gits_write_cwriter(v, c)	writeq_relaxed(v, c)
131 
132 #define gicr_read_propbaser(c)		readq_relaxed(c)
133 #define gicr_write_propbaser(v, c)	writeq_relaxed(v, c)
134 
135 #define gicr_write_pendbaser(v, c)	writeq_relaxed(v, c)
136 #define gicr_read_pendbaser(c)		readq_relaxed(c)
137 
138 #define gits_write_vpropbaser(v, c)	writeq_relaxed(v, c)
139 
140 #define gits_write_vpendbaser(v, c)	writeq_relaxed(v, c)
141 #define gits_read_vpendbaser(c)		readq_relaxed(c)
142 
143 #endif /* __ASSEMBLY__ */
144 #endif /* __ASM_ARCH_GICV3_H */
145