arch/arm/include/asm/arch_gicv3.h

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