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1 /*
2  * arch/arm/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 #ifndef __ASSEMBLY__
22
23 #include <linux/io.h>
24
25 #define __ACCESS_CP15(CRn, Op1, CRm, Op2)       p15, Op1, %0, CRn, CRm, Op2
26 #define __ACCESS_CP15_64(Op1, CRm)              p15, Op1, %Q0, %R0, CRm
27
28 #define ICC_EOIR1                       __ACCESS_CP15(c12, 0, c12, 1)
29 #define ICC_DIR                         __ACCESS_CP15(c12, 0, c11, 1)
30 #define ICC_IAR1                        __ACCESS_CP15(c12, 0, c12, 0)
31 #define ICC_SGI1R                       __ACCESS_CP15_64(0, c12)
32 #define ICC_PMR                         __ACCESS_CP15(c4, 0, c6, 0)
33 #define ICC_CTLR                        __ACCESS_CP15(c12, 0, c12, 4)
34 #define ICC_SRE                         __ACCESS_CP15(c12, 0, c12, 5)
35 #define ICC_IGRPEN1                     __ACCESS_CP15(c12, 0, c12, 7)
36
37 #define ICC_HSRE                        __ACCESS_CP15(c12, 4, c9, 5)
38
39 #define ICH_VSEIR                       __ACCESS_CP15(c12, 4, c9, 4)
40 #define ICH_HCR                         __ACCESS_CP15(c12, 4, c11, 0)
41 #define ICH_VTR                         __ACCESS_CP15(c12, 4, c11, 1)
42 #define ICH_MISR                        __ACCESS_CP15(c12, 4, c11, 2)
43 #define ICH_EISR                        __ACCESS_CP15(c12, 4, c11, 3)
44 #define ICH_ELSR                        __ACCESS_CP15(c12, 4, c11, 5)
45 #define ICH_VMCR                        __ACCESS_CP15(c12, 4, c11, 7)
46
47 #define __LR0(x)                        __ACCESS_CP15(c12, 4, c12, x)
48 #define __LR8(x)                        __ACCESS_CP15(c12, 4, c13, x)
49
50 #define ICH_LR0                         __LR0(0)
51 #define ICH_LR1                         __LR0(1)
52 #define ICH_LR2                         __LR0(2)
53 #define ICH_LR3                         __LR0(3)
54 #define ICH_LR4                         __LR0(4)
55 #define ICH_LR5                         __LR0(5)
56 #define ICH_LR6                         __LR0(6)
57 #define ICH_LR7                         __LR0(7)
58 #define ICH_LR8                         __LR8(0)
59 #define ICH_LR9                         __LR8(1)
60 #define ICH_LR10                        __LR8(2)
61 #define ICH_LR11                        __LR8(3)
62 #define ICH_LR12                        __LR8(4)
63 #define ICH_LR13                        __LR8(5)
64 #define ICH_LR14                        __LR8(6)
65 #define ICH_LR15                        __LR8(7)
66
67 /* LR top half */
68 #define __LRC0(x)                       __ACCESS_CP15(c12, 4, c14, x)
69 #define __LRC8(x)                       __ACCESS_CP15(c12, 4, c15, x)
70
71 #define ICH_LRC0                        __LRC0(0)
72 #define ICH_LRC1                        __LRC0(1)
73 #define ICH_LRC2                        __LRC0(2)
74 #define ICH_LRC3                        __LRC0(3)
75 #define ICH_LRC4                        __LRC0(4)
76 #define ICH_LRC5                        __LRC0(5)
77 #define ICH_LRC6                        __LRC0(6)
78 #define ICH_LRC7                        __LRC0(7)
79 #define ICH_LRC8                        __LRC8(0)
80 #define ICH_LRC9                        __LRC8(1)
81 #define ICH_LRC10                       __LRC8(2)
82 #define ICH_LRC11                       __LRC8(3)
83 #define ICH_LRC12                       __LRC8(4)
84 #define ICH_LRC13                       __LRC8(5)
85 #define ICH_LRC14                       __LRC8(6)
86 #define ICH_LRC15                       __LRC8(7)
87
88 #define __AP0Rx(x)                      __ACCESS_CP15(c12, 4, c8, x)
89 #define ICH_AP0R0                       __AP0Rx(0)
90 #define ICH_AP0R1                       __AP0Rx(1)
91 #define ICH_AP0R2                       __AP0Rx(2)
92 #define ICH_AP0R3                       __AP0Rx(3)
93
94 #define __AP1Rx(x)                      __ACCESS_CP15(c12, 4, c9, x)
95 #define ICH_AP1R0                       __AP1Rx(0)
96 #define ICH_AP1R1                       __AP1Rx(1)
97 #define ICH_AP1R2                       __AP1Rx(2)
98 #define ICH_AP1R3                       __AP1Rx(3)
99
100 /* Low-level accessors */
101
102 static inline void gic_write_eoir(u32 irq)
103 {
104         asm volatile("mcr " __stringify(ICC_EOIR1) : : "r" (irq));
105         isb();
106 }
107
108 static inline void gic_write_dir(u32 val)
109 {
110         asm volatile("mcr " __stringify(ICC_DIR) : : "r" (val));
111         isb();
112 }
113
114 static inline u32 gic_read_iar(void)
115 {
116         u32 irqstat;
117
118         asm volatile("mrc " __stringify(ICC_IAR1) : "=r" (irqstat));
119         return irqstat;
120 }
121
122 static inline void gic_write_pmr(u32 val)
123 {
124         asm volatile("mcr " __stringify(ICC_PMR) : : "r" (val));
125 }
126
127 static inline void gic_write_ctlr(u32 val)
128 {
129         asm volatile("mcr " __stringify(ICC_CTLR) : : "r" (val));
130         isb();
131 }
132
133 static inline void gic_write_grpen1(u32 val)
134 {
135         asm volatile("mcr " __stringify(ICC_IGRPEN1) : : "r" (val));
136         isb();
137 }
138
139 static inline void gic_write_sgi1r(u64 val)
140 {
141         asm volatile("mcrr " __stringify(ICC_SGI1R) : : "r" (val));
142 }
143
144 static inline u32 gic_read_sre(void)
145 {
146         u32 val;
147
148         asm volatile("mrc " __stringify(ICC_SRE) : "=r" (val));
149         return val;
150 }
151
152 static inline void gic_write_sre(u32 val)
153 {
154         asm volatile("mcr " __stringify(ICC_SRE) : : "r" (val));
155         isb();
156 }
157
158 /*
159  * Even in 32bit systems that use LPAE, there is no guarantee that the I/O
160  * interface provides true 64bit atomic accesses, so using strd/ldrd doesn't
161  * make much sense.
162  * Moreover, 64bit I/O emulation is extremely difficult to implement on
163  * AArch32, since the syndrome register doesn't provide any information for
164  * them.
165  * Consequently, the following IO helpers use 32bit accesses.
166  *
167  * There are only two registers that need 64bit accesses in this driver:
168  * - GICD_IROUTERn, contain the affinity values associated to each interrupt.
169  *   The upper-word (aff3) will always be 0, so there is no need for a lock.
170  * - GICR_TYPER is an ID register and doesn't need atomicity.
171  */
172 static inline void gic_write_irouter(u64 val, volatile void __iomem *addr)
173 {
174         writel_relaxed((u32)val, addr);
175         writel_relaxed((u32)(val >> 32), addr + 4);
176 }
177
178 static inline u64 gic_read_typer(const volatile void __iomem *addr)
179 {
180         u64 val;
181
182         val = readl_relaxed(addr);
183         val |= (u64)readl_relaxed(addr + 4) << 32;
184         return val;
185 }
186
187 #endif /* !__ASSEMBLY__ */
188 #endif /* !__ASM_ARCH_GICV3_H */