1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * arch/arm/include/asm/arch_gicv3.h
4 *
5 * Copyright (C) 2015 ARM Ltd.
6 */
7 #ifndef __ASM_ARCH_GICV3_H
8 #define __ASM_ARCH_GICV3_H
9
10 #ifndef __ASSEMBLY__
11
12 #include <linux/io.h>
13 #include <linux/io-64-nonatomic-lo-hi.h>
14 #include <asm/barrier.h>
15 #include <asm/cacheflush.h>
16 #include <asm/cp15.h>
17
18 #define ICC_EOIR1 __ACCESS_CP15(c12, 0, c12, 1)
19 #define ICC_DIR __ACCESS_CP15(c12, 0, c11, 1)
20 #define ICC_IAR1 __ACCESS_CP15(c12, 0, c12, 0)
21 #define ICC_SGI1R __ACCESS_CP15_64(0, c12)
22 #define ICC_PMR __ACCESS_CP15(c4, 0, c6, 0)
23 #define ICC_CTLR __ACCESS_CP15(c12, 0, c12, 4)
24 #define ICC_SRE __ACCESS_CP15(c12, 0, c12, 5)
25 #define ICC_IGRPEN1 __ACCESS_CP15(c12, 0, c12, 7)
26 #define ICC_BPR1 __ACCESS_CP15(c12, 0, c12, 3)
27 #define ICC_RPR __ACCESS_CP15(c12, 0, c11, 3)
28
29 #define __ICC_AP0Rx(x) __ACCESS_CP15(c12, 0, c8, 4 | x)
30 #define ICC_AP0R0 __ICC_AP0Rx(0)
31 #define ICC_AP0R1 __ICC_AP0Rx(1)
32 #define ICC_AP0R2 __ICC_AP0Rx(2)
33 #define ICC_AP0R3 __ICC_AP0Rx(3)
34
35 #define __ICC_AP1Rx(x) __ACCESS_CP15(c12, 0, c9, x)
36 #define ICC_AP1R0 __ICC_AP1Rx(0)
37 #define ICC_AP1R1 __ICC_AP1Rx(1)
38 #define ICC_AP1R2 __ICC_AP1Rx(2)
39 #define ICC_AP1R3 __ICC_AP1Rx(3)
40
41 #define CPUIF_MAP(a32, a64) \
42 static inline void write_ ## a64(u32 val) \
43 { \
44 write_sysreg(val, a32); \
45 } \
46 static inline u32 read_ ## a64(void) \
47 { \
48 return read_sysreg(a32); \
49 } \
50
51 CPUIF_MAP(ICC_EOIR1, ICC_EOIR1_EL1)
52 CPUIF_MAP(ICC_PMR, ICC_PMR_EL1)
53 CPUIF_MAP(ICC_AP0R0, ICC_AP0R0_EL1)
54 CPUIF_MAP(ICC_AP0R1, ICC_AP0R1_EL1)
55 CPUIF_MAP(ICC_AP0R2, ICC_AP0R2_EL1)
56 CPUIF_MAP(ICC_AP0R3, ICC_AP0R3_EL1)
57 CPUIF_MAP(ICC_AP1R0, ICC_AP1R0_EL1)
58 CPUIF_MAP(ICC_AP1R1, ICC_AP1R1_EL1)
59 CPUIF_MAP(ICC_AP1R2, ICC_AP1R2_EL1)
60 CPUIF_MAP(ICC_AP1R3, ICC_AP1R3_EL1)
61
62 #define read_gicreg(r) read_##r()
63 #define write_gicreg(v, r) write_##r(v)
64
65 /* Low-level accessors */
66
67 static inline void gic_write_dir(u32 val)
68 {
69 write_sysreg(val, ICC_DIR);
70 isb();
71 }
72
73 static inline u32 gic_read_iar(void)
74 {
75 u32 irqstat = read_sysreg(ICC_IAR1);
76
77 dsb(sy);
78
79 return irqstat;
80 }
81
82 static inline void gic_write_ctlr(u32 val)
83 {
84 write_sysreg(val, ICC_CTLR);
85 isb();
86 }
87
88 static inline u32 gic_read_ctlr(void)
89 {
90 return read_sysreg(ICC_CTLR);
91 }
92
93 static inline void gic_write_grpen1(u32 val)
94 {
95 write_sysreg(val, ICC_IGRPEN1);
96 isb();
97 }
98
99 static inline void gic_write_sgi1r(u64 val)
100 {
101 write_sysreg(val, ICC_SGI1R);
102 }
103
104 static inline u32 gic_read_sre(void)
105 {
106 return read_sysreg(ICC_SRE);
107 }
108
109 static inline void gic_write_sre(u32 val)
110 {
111 write_sysreg(val, ICC_SRE);
112 isb();
113 }
114
115 static inline void gic_write_bpr1(u32 val)
116 {
117 write_sysreg(val, ICC_BPR1);
118 }
119
120 static inline u32 gic_read_pmr(void)
121 {
122 return read_sysreg(ICC_PMR);
123 }
124
125 static inline void gic_write_pmr(u32 val)
126 {
127 write_sysreg(val, ICC_PMR);
128 }
129
130 static inline u32 gic_read_rpr(void)
131 {
132 return read_sysreg(ICC_RPR);
133 }
134
135 /*
136 * Even in 32bit systems that use LPAE, there is no guarantee that the I/O
137 * interface provides true 64bit atomic accesses, so using strd/ldrd doesn't
138 * make much sense.
139 * Moreover, 64bit I/O emulation is extremely difficult to implement on
140 * AArch32, since the syndrome register doesn't provide any information for
141 * them.
142 * Consequently, the following IO helpers use 32bit accesses.
143 */
144 static inline void __gic_writeq_nonatomic(u64 val, volatile void __iomem *addr)
145 {
146 writel_relaxed((u32)val, addr);
147 writel_relaxed((u32)(val >> 32), addr + 4);
148 }
149
150 static inline u64 __gic_readq_nonatomic(const volatile void __iomem *addr)
151 {
152 u64 val;
153
154 val = readl_relaxed(addr);
155 val |= (u64)readl_relaxed(addr + 4) << 32;
156 return val;
157 }
158
159 #define gic_flush_dcache_to_poc(a,l) __cpuc_flush_dcache_area((a), (l))
160
161 /*
162 * GICD_IROUTERn, contain the affinity values associated to each interrupt.
163 * The upper-word (aff3) will always be 0, so there is no need for a lock.
164 */
165 #define gic_write_irouter(v, c) __gic_writeq_nonatomic(v, c)
166
167 /*
168 * GICR_TYPER is an ID register and doesn't need atomicity.
169 */
170 #define gic_read_typer(c) __gic_readq_nonatomic(c)
171
172 /*
173 * GITS_BASER - hi and lo bits may be accessed independently.
174 */
175 #define gits_read_baser(c) __gic_readq_nonatomic(c)
176 #define gits_write_baser(v, c) __gic_writeq_nonatomic(v, c)
177
178 /*
179 * GICR_PENDBASER and GICR_PROPBASE are changed with LPIs disabled, so they
180 * won't be being used during any updates and can be changed non-atomically
181 */
182 #define gicr_read_propbaser(c) __gic_readq_nonatomic(c)
183 #define gicr_write_propbaser(v, c) __gic_writeq_nonatomic(v, c)
184 #define gicr_read_pendbaser(c) __gic_readq_nonatomic(c)
185 #define gicr_write_pendbaser(v, c) __gic_writeq_nonatomic(v, c)
186
187 /*
188 * GICR_xLPIR - only the lower bits are significant
189 */
190 #define gic_read_lpir(c) readl_relaxed(c)
191 #define gic_write_lpir(v, c) writel_relaxed(lower_32_bits(v), c)
192
193 /*
194 * GITS_TYPER is an ID register and doesn't need atomicity.
195 */
196 #define gits_read_typer(c) __gic_readq_nonatomic(c)
197
198 /*
199 * GITS_CBASER - hi and lo bits may be accessed independently.
200 */
201 #define gits_read_cbaser(c) __gic_readq_nonatomic(c)
202 #define gits_write_cbaser(v, c) __gic_writeq_nonatomic(v, c)
203
204 /*
205 * GITS_CWRITER - hi and lo bits may be accessed independently.
206 */
207 #define gits_write_cwriter(v, c) __gic_writeq_nonatomic(v, c)
208
209 /*
210 * GICR_VPROPBASER - hi and lo bits may be accessed independently.
211 */
212 #define gicr_read_vpropbaser(c) __gic_readq_nonatomic(c)
213 #define gicr_write_vpropbaser(v, c) __gic_writeq_nonatomic(v, c)
214
215 /*
216 * GICR_VPENDBASER - the Valid bit must be cleared before changing
217 * anything else.
218 */
219 static inline void gicr_write_vpendbaser(u64 val, void __iomem *addr)
220 {
221 u32 tmp;
222
223 tmp = readl_relaxed(addr + 4);
224 if (tmp & (GICR_VPENDBASER_Valid >> 32)) {
225 tmp &= ~(GICR_VPENDBASER_Valid >> 32);
226 writel_relaxed(tmp, addr + 4);
227 }
228
229 /*
230 * Use the fact that __gic_writeq_nonatomic writes the second
231 * half of the 64bit quantity after the first.
232 */
233 __gic_writeq_nonatomic(val, addr);
234 }
235
236 #define gicr_read_vpendbaser(c) __gic_readq_nonatomic(c)
237
238 static inline bool gic_prio_masking_enabled(void)
239 {
240 return false;
241 }
242
243 static inline void gic_pmr_mask_irqs(void)
244 {
245 /* Should not get called. */
246 WARN_ON_ONCE(true);
247 }
248
249 static inline void gic_arch_enable_irqs(void)
250 {
251 /* Should not get called. */
252 WARN_ON_ONCE(true);
253 }
254
255 static inline bool gic_has_relaxed_pmr_sync(void)
256 {
257 return false;
258 }
259
260 #endif /* !__ASSEMBLY__ */
261 #endif /* !__ASM_ARCH_GICV3_H */
262
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