Merge greybus driver tree into 4.8-rc6
[cascardo/linux.git] / arch / arm / include / asm / arch_gicv3.h
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 #include <asm/barrier.h>
25
26 #define __ACCESS_CP15(CRn, Op1, CRm, Op2)       p15, Op1, %0, CRn, CRm, Op2
27 #define __ACCESS_CP15_64(Op1, CRm)              p15, Op1, %Q0, %R0, CRm
28
29 #define ICC_EOIR1                       __ACCESS_CP15(c12, 0, c12, 1)
30 #define ICC_DIR                         __ACCESS_CP15(c12, 0, c11, 1)
31 #define ICC_IAR1                        __ACCESS_CP15(c12, 0, c12, 0)
32 #define ICC_SGI1R                       __ACCESS_CP15_64(0, c12)
33 #define ICC_PMR                         __ACCESS_CP15(c4, 0, c6, 0)
34 #define ICC_CTLR                        __ACCESS_CP15(c12, 0, c12, 4)
35 #define ICC_SRE                         __ACCESS_CP15(c12, 0, c12, 5)
36 #define ICC_IGRPEN1                     __ACCESS_CP15(c12, 0, c12, 7)
37
38 #define ICC_HSRE                        __ACCESS_CP15(c12, 4, c9, 5)
39
40 #define ICH_VSEIR                       __ACCESS_CP15(c12, 4, c9, 4)
41 #define ICH_HCR                         __ACCESS_CP15(c12, 4, c11, 0)
42 #define ICH_VTR                         __ACCESS_CP15(c12, 4, c11, 1)
43 #define ICH_MISR                        __ACCESS_CP15(c12, 4, c11, 2)
44 #define ICH_EISR                        __ACCESS_CP15(c12, 4, c11, 3)
45 #define ICH_ELSR                        __ACCESS_CP15(c12, 4, c11, 5)
46 #define ICH_VMCR                        __ACCESS_CP15(c12, 4, c11, 7)
47
48 #define __LR0(x)                        __ACCESS_CP15(c12, 4, c12, x)
49 #define __LR8(x)                        __ACCESS_CP15(c12, 4, c13, x)
50
51 #define ICH_LR0                         __LR0(0)
52 #define ICH_LR1                         __LR0(1)
53 #define ICH_LR2                         __LR0(2)
54 #define ICH_LR3                         __LR0(3)
55 #define ICH_LR4                         __LR0(4)
56 #define ICH_LR5                         __LR0(5)
57 #define ICH_LR6                         __LR0(6)
58 #define ICH_LR7                         __LR0(7)
59 #define ICH_LR8                         __LR8(0)
60 #define ICH_LR9                         __LR8(1)
61 #define ICH_LR10                        __LR8(2)
62 #define ICH_LR11                        __LR8(3)
63 #define ICH_LR12                        __LR8(4)
64 #define ICH_LR13                        __LR8(5)
65 #define ICH_LR14                        __LR8(6)
66 #define ICH_LR15                        __LR8(7)
67
68 /* LR top half */
69 #define __LRC0(x)                       __ACCESS_CP15(c12, 4, c14, x)
70 #define __LRC8(x)                       __ACCESS_CP15(c12, 4, c15, x)
71
72 #define ICH_LRC0                        __LRC0(0)
73 #define ICH_LRC1                        __LRC0(1)
74 #define ICH_LRC2                        __LRC0(2)
75 #define ICH_LRC3                        __LRC0(3)
76 #define ICH_LRC4                        __LRC0(4)
77 #define ICH_LRC5                        __LRC0(5)
78 #define ICH_LRC6                        __LRC0(6)
79 #define ICH_LRC7                        __LRC0(7)
80 #define ICH_LRC8                        __LRC8(0)
81 #define ICH_LRC9                        __LRC8(1)
82 #define ICH_LRC10                       __LRC8(2)
83 #define ICH_LRC11                       __LRC8(3)
84 #define ICH_LRC12                       __LRC8(4)
85 #define ICH_LRC13                       __LRC8(5)
86 #define ICH_LRC14                       __LRC8(6)
87 #define ICH_LRC15                       __LRC8(7)
88
89 #define __AP0Rx(x)                      __ACCESS_CP15(c12, 4, c8, x)
90 #define ICH_AP0R0                       __AP0Rx(0)
91 #define ICH_AP0R1                       __AP0Rx(1)
92 #define ICH_AP0R2                       __AP0Rx(2)
93 #define ICH_AP0R3                       __AP0Rx(3)
94
95 #define __AP1Rx(x)                      __ACCESS_CP15(c12, 4, c9, x)
96 #define ICH_AP1R0                       __AP1Rx(0)
97 #define ICH_AP1R1                       __AP1Rx(1)
98 #define ICH_AP1R2                       __AP1Rx(2)
99 #define ICH_AP1R3                       __AP1Rx(3)
100
101 /* Low-level accessors */
102
103 static inline void gic_write_eoir(u32 irq)
104 {
105         asm volatile("mcr " __stringify(ICC_EOIR1) : : "r" (irq));
106         isb();
107 }
108
109 static inline void gic_write_dir(u32 val)
110 {
111         asm volatile("mcr " __stringify(ICC_DIR) : : "r" (val));
112         isb();
113 }
114
115 static inline u32 gic_read_iar(void)
116 {
117         u32 irqstat;
118
119         asm volatile("mrc " __stringify(ICC_IAR1) : "=r" (irqstat));
120         dsb(sy);
121         return irqstat;
122 }
123
124 static inline void gic_write_pmr(u32 val)
125 {
126         asm volatile("mcr " __stringify(ICC_PMR) : : "r" (val));
127 }
128
129 static inline void gic_write_ctlr(u32 val)
130 {
131         asm volatile("mcr " __stringify(ICC_CTLR) : : "r" (val));
132         isb();
133 }
134
135 static inline void gic_write_grpen1(u32 val)
136 {
137         asm volatile("mcr " __stringify(ICC_IGRPEN1) : : "r" (val));
138         isb();
139 }
140
141 static inline void gic_write_sgi1r(u64 val)
142 {
143         asm volatile("mcrr " __stringify(ICC_SGI1R) : : "r" (val));
144 }
145
146 static inline u32 gic_read_sre(void)
147 {
148         u32 val;
149
150         asm volatile("mrc " __stringify(ICC_SRE) : "=r" (val));
151         return val;
152 }
153
154 static inline void gic_write_sre(u32 val)
155 {
156         asm volatile("mcr " __stringify(ICC_SRE) : : "r" (val));
157         isb();
158 }
159
160 /*
161  * Even in 32bit systems that use LPAE, there is no guarantee that the I/O
162  * interface provides true 64bit atomic accesses, so using strd/ldrd doesn't
163  * make much sense.
164  * Moreover, 64bit I/O emulation is extremely difficult to implement on
165  * AArch32, since the syndrome register doesn't provide any information for
166  * them.
167  * Consequently, the following IO helpers use 32bit accesses.
168  *
169  * There are only two registers that need 64bit accesses in this driver:
170  * - GICD_IROUTERn, contain the affinity values associated to each interrupt.
171  *   The upper-word (aff3) will always be 0, so there is no need for a lock.
172  * - GICR_TYPER is an ID register and doesn't need atomicity.
173  */
174 static inline void gic_write_irouter(u64 val, volatile void __iomem *addr)
175 {
176         writel_relaxed((u32)val, addr);
177         writel_relaxed((u32)(val >> 32), addr + 4);
178 }
179
180 static inline u64 gic_read_typer(const volatile void __iomem *addr)
181 {
182         u64 val;
183
184         val = readl_relaxed(addr);
185         val |= (u64)readl_relaxed(addr + 4) << 32;
186         return val;
187 }
188
189 #endif /* !__ASSEMBLY__ */
190 #endif /* !__ASM_ARCH_GICV3_H */