Merge tag 'topic/nvidia-gsp-2023-11-03' of git://anongit.freedesktop.org/drm/drm
[linux-2.6-microblaze.git] / arch / arm64 / include / asm / arch_gicv3.h
1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * arch/arm64/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 #include <asm/sysreg.h>
11
12 #ifndef __ASSEMBLY__
13
14 #include <linux/irqchip/arm-gic-common.h>
15 #include <linux/stringify.h>
16 #include <asm/barrier.h>
17 #include <asm/cacheflush.h>
18
19 #define read_gicreg(r)                  read_sysreg_s(SYS_ ## r)
20 #define write_gicreg(v, r)              write_sysreg_s(v, SYS_ ## r)
21
22 /*
23  * Low-level accessors
24  *
25  * These system registers are 32 bits, but we make sure that the compiler
26  * sets the GP register's most significant bits to 0 with an explicit cast.
27  */
28
29 static __always_inline void gic_write_dir(u32 irq)
30 {
31         write_sysreg_s(irq, SYS_ICC_DIR_EL1);
32         isb();
33 }
34
35 static inline u64 gic_read_iar_common(void)
36 {
37         u64 irqstat;
38
39         irqstat = read_sysreg_s(SYS_ICC_IAR1_EL1);
40         dsb(sy);
41         return irqstat;
42 }
43
44 /*
45  * Cavium ThunderX erratum 23154
46  *
47  * The gicv3 of ThunderX requires a modified version for reading the
48  * IAR status to ensure data synchronization (access to icc_iar1_el1
49  * is not sync'ed before and after).
50  *
51  * Erratum 38545
52  *
53  * When a IAR register read races with a GIC interrupt RELEASE event,
54  * GIC-CPU interface could wrongly return a valid INTID to the CPU
55  * for an interrupt that is already released(non activated) instead of 0x3ff.
56  *
57  * To workaround this, return a valid interrupt ID only if there is a change
58  * in the active priority list after the IAR read.
59  *
60  * Common function used for both the workarounds since,
61  * 1. On Thunderx 88xx 1.x both erratas are applicable.
62  * 2. Having extra nops doesn't add any side effects for Silicons where
63  *    erratum 23154 is not applicable.
64  */
65 static inline u64 gic_read_iar_cavium_thunderx(void)
66 {
67         u64 irqstat, apr;
68
69         apr = read_sysreg_s(SYS_ICC_AP1R0_EL1);
70         nops(8);
71         irqstat = read_sysreg_s(SYS_ICC_IAR1_EL1);
72         nops(4);
73         mb();
74
75         /* Max priority groups implemented is only 32 */
76         if (likely(apr != read_sysreg_s(SYS_ICC_AP1R0_EL1)))
77                 return irqstat;
78
79         return 0x3ff;
80 }
81
82 static u64 __maybe_unused gic_read_iar(void)
83 {
84         if (alternative_has_cap_unlikely(ARM64_WORKAROUND_CAVIUM_23154))
85                 return gic_read_iar_cavium_thunderx();
86         else
87                 return gic_read_iar_common();
88 }
89
90 static inline void gic_write_ctlr(u32 val)
91 {
92         write_sysreg_s(val, SYS_ICC_CTLR_EL1);
93         isb();
94 }
95
96 static inline u32 gic_read_ctlr(void)
97 {
98         return read_sysreg_s(SYS_ICC_CTLR_EL1);
99 }
100
101 static inline void gic_write_grpen1(u32 val)
102 {
103         write_sysreg_s(val, SYS_ICC_IGRPEN1_EL1);
104         isb();
105 }
106
107 static inline void gic_write_sgi1r(u64 val)
108 {
109         write_sysreg_s(val, SYS_ICC_SGI1R_EL1);
110 }
111
112 static inline u32 gic_read_sre(void)
113 {
114         return read_sysreg_s(SYS_ICC_SRE_EL1);
115 }
116
117 static inline void gic_write_sre(u32 val)
118 {
119         write_sysreg_s(val, SYS_ICC_SRE_EL1);
120         isb();
121 }
122
123 static inline void gic_write_bpr1(u32 val)
124 {
125         write_sysreg_s(val, SYS_ICC_BPR1_EL1);
126 }
127
128 static inline u32 gic_read_pmr(void)
129 {
130         return read_sysreg_s(SYS_ICC_PMR_EL1);
131 }
132
133 static __always_inline void gic_write_pmr(u32 val)
134 {
135         write_sysreg_s(val, SYS_ICC_PMR_EL1);
136 }
137
138 static inline u32 gic_read_rpr(void)
139 {
140         return read_sysreg_s(SYS_ICC_RPR_EL1);
141 }
142
143 #define gic_read_typer(c)               readq_relaxed(c)
144 #define gic_write_irouter(v, c)         writeq_relaxed(v, c)
145 #define gic_read_lpir(c)                readq_relaxed(c)
146 #define gic_write_lpir(v, c)            writeq_relaxed(v, c)
147
148 #define gic_flush_dcache_to_poc(a,l)    \
149         dcache_clean_inval_poc((unsigned long)(a), (unsigned long)(a)+(l))
150
151 #define gits_read_baser(c)              readq_relaxed(c)
152 #define gits_write_baser(v, c)          writeq_relaxed(v, c)
153
154 #define gits_read_cbaser(c)             readq_relaxed(c)
155 #define gits_write_cbaser(v, c)         writeq_relaxed(v, c)
156
157 #define gits_write_cwriter(v, c)        writeq_relaxed(v, c)
158
159 #define gicr_read_propbaser(c)          readq_relaxed(c)
160 #define gicr_write_propbaser(v, c)      writeq_relaxed(v, c)
161
162 #define gicr_write_pendbaser(v, c)      writeq_relaxed(v, c)
163 #define gicr_read_pendbaser(c)          readq_relaxed(c)
164
165 #define gicr_write_vpropbaser(v, c)     writeq_relaxed(v, c)
166 #define gicr_read_vpropbaser(c)         readq_relaxed(c)
167
168 #define gicr_write_vpendbaser(v, c)     writeq_relaxed(v, c)
169 #define gicr_read_vpendbaser(c)         readq_relaxed(c)
170
171 static inline bool gic_prio_masking_enabled(void)
172 {
173         return system_uses_irq_prio_masking();
174 }
175
176 static inline void gic_pmr_mask_irqs(void)
177 {
178         BUILD_BUG_ON(GICD_INT_DEF_PRI < (__GIC_PRIO_IRQOFF |
179                                          GIC_PRIO_PSR_I_SET));
180         BUILD_BUG_ON(GICD_INT_DEF_PRI >= GIC_PRIO_IRQON);
181         /*
182          * Need to make sure IRQON allows IRQs when SCR_EL3.FIQ is cleared
183          * and non-secure PMR accesses are not subject to the shifts that
184          * are applied to IRQ priorities
185          */
186         BUILD_BUG_ON((0x80 | (GICD_INT_DEF_PRI >> 1)) >= GIC_PRIO_IRQON);
187         /*
188          * Same situation as above, but now we make sure that we can mask
189          * regular interrupts.
190          */
191         BUILD_BUG_ON((0x80 | (GICD_INT_DEF_PRI >> 1)) < (__GIC_PRIO_IRQOFF_NS |
192                                                          GIC_PRIO_PSR_I_SET));
193         gic_write_pmr(GIC_PRIO_IRQOFF);
194 }
195
196 static inline void gic_arch_enable_irqs(void)
197 {
198         asm volatile ("msr daifclr, #3" : : : "memory");
199 }
200
201 static inline bool gic_has_relaxed_pmr_sync(void)
202 {
203         return cpus_have_cap(ARM64_HAS_GIC_PRIO_RELAXED_SYNC);
204 }
205
206 #endif /* __ASSEMBLY__ */
207 #endif /* __ASM_ARCH_GICV3_H */