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 ICC_HSRE                        __ACCESS_CP15(c12, 4, c9, 5)
  42
  43 #define ICH_VSEIR                       __ACCESS_CP15(c12, 4, c9, 4)
  44 #define ICH_HCR                         __ACCESS_CP15(c12, 4, c11, 0)
  45 #define ICH_VTR                         __ACCESS_CP15(c12, 4, c11, 1)
  46 #define ICH_MISR                        __ACCESS_CP15(c12, 4, c11, 2)
  47 #define ICH_EISR                        __ACCESS_CP15(c12, 4, c11, 3)
  48 #define ICH_ELRSR                       __ACCESS_CP15(c12, 4, c11, 5)
  49 #define ICH_VMCR                        __ACCESS_CP15(c12, 4, c11, 7)
  50
  51 #define __LR0(x)                        __ACCESS_CP15(c12, 4, c12, x)
  52 #define __LR8(x)                        __ACCESS_CP15(c12, 4, c13, x)
  53
  54 #define ICH_LR0                         __LR0(0)
  55 #define ICH_LR1                         __LR0(1)
  56 #define ICH_LR2                         __LR0(2)
  57 #define ICH_LR3                         __LR0(3)
  58 #define ICH_LR4                         __LR0(4)
  59 #define ICH_LR5                         __LR0(5)
  60 #define ICH_LR6                         __LR0(6)
  61 #define ICH_LR7                         __LR0(7)
  62 #define ICH_LR8                         __LR8(0)
  63 #define ICH_LR9                         __LR8(1)
  64 #define ICH_LR10                        __LR8(2)
  65 #define ICH_LR11                        __LR8(3)
  66 #define ICH_LR12                        __LR8(4)
  67 #define ICH_LR13                        __LR8(5)
  68 #define ICH_LR14                        __LR8(6)
  69 #define ICH_LR15                        __LR8(7)
  70
  71 /* LR top half */
  72 #define __LRC0(x)                       __ACCESS_CP15(c12, 4, c14, x)
  73 #define __LRC8(x)                       __ACCESS_CP15(c12, 4, c15, x)
  74
  75 #define ICH_LRC0                        __LRC0(0)
  76 #define ICH_LRC1                        __LRC0(1)
  77 #define ICH_LRC2                        __LRC0(2)
  78 #define ICH_LRC3                        __LRC0(3)
  79 #define ICH_LRC4                        __LRC0(4)
  80 #define ICH_LRC5                        __LRC0(5)
  81 #define ICH_LRC6                        __LRC0(6)
  82 #define ICH_LRC7                        __LRC0(7)
  83 #define ICH_LRC8                        __LRC8(0)
  84 #define ICH_LRC9                        __LRC8(1)
  85 #define ICH_LRC10                       __LRC8(2)
  86 #define ICH_LRC11                       __LRC8(3)
  87 #define ICH_LRC12                       __LRC8(4)
  88 #define ICH_LRC13                       __LRC8(5)
  89 #define ICH_LRC14                       __LRC8(6)
  90 #define ICH_LRC15                       __LRC8(7)
  91
  92 #define __ICH_AP0Rx(x)                  __ACCESS_CP15(c12, 4, c8, x)
  93 #define ICH_AP0R0                       __ICH_AP0Rx(0)
  94 #define ICH_AP0R1                       __ICH_AP0Rx(1)
  95 #define ICH_AP0R2                       __ICH_AP0Rx(2)
  96 #define ICH_AP0R3                       __ICH_AP0Rx(3)
  97
  98 #define __ICH_AP1Rx(x)                  __ACCESS_CP15(c12, 4, c9, x)
  99 #define ICH_AP1R0                       __ICH_AP1Rx(0)
 100 #define ICH_AP1R1                       __ICH_AP1Rx(1)
 101 #define ICH_AP1R2                       __ICH_AP1Rx(2)
 102 #define ICH_AP1R3                       __ICH_AP1Rx(3)
 103
 104 /* A32-to-A64 mappings used by VGIC save/restore */
 105
 106 #define CPUIF_MAP(a32, a64)                     \
 107 static inline void write_ ## a64(u32 val)       \
 108 {                                               \
 109         write_sysreg(val, a32);                 \
 110 }                                               \
 111 static inline u32 read_ ## a64(void)            \
 112 {                                               \
 113         return read_sysreg(a32);                \
 114 }                                               \
 115
 116 #define CPUIF_MAP_LO_HI(a32lo, a32hi, a64)      \
 117 static inline void write_ ## a64(u64 val)       \
 118 {                                               \
 119         write_sysreg(lower_32_bits(val), a32lo);\
 120         write_sysreg(upper_32_bits(val), a32hi);\
 121 }                                               \
 122 static inline u64 read_ ## a64(void)            \
 123 {                                               \
 124         u64 val = read_sysreg(a32lo);           \
 125                                                 \
 126         val |=  (u64)read_sysreg(a32hi) << 32;  \
 127                                                 \
 128         return val;                             \
 129 }
 130
 131 CPUIF_MAP(ICC_PMR, ICC_PMR_EL1)
 132 CPUIF_MAP(ICC_AP0R0, ICC_AP0R0_EL1)
 133 CPUIF_MAP(ICC_AP0R1, ICC_AP0R1_EL1)
 134 CPUIF_MAP(ICC_AP0R2, ICC_AP0R2_EL1)
 135 CPUIF_MAP(ICC_AP0R3, ICC_AP0R3_EL1)
 136 CPUIF_MAP(ICC_AP1R0, ICC_AP1R0_EL1)
 137 CPUIF_MAP(ICC_AP1R1, ICC_AP1R1_EL1)
 138 CPUIF_MAP(ICC_AP1R2, ICC_AP1R2_EL1)
 139 CPUIF_MAP(ICC_AP1R3, ICC_AP1R3_EL1)
 140
 141 CPUIF_MAP(ICH_HCR, ICH_HCR_EL2)
 142 CPUIF_MAP(ICH_VTR, ICH_VTR_EL2)
 143 CPUIF_MAP(ICH_MISR, ICH_MISR_EL2)
 144 CPUIF_MAP(ICH_EISR, ICH_EISR_EL2)
 145 CPUIF_MAP(ICH_ELRSR, ICH_ELRSR_EL2)
 146 CPUIF_MAP(ICH_VMCR, ICH_VMCR_EL2)
 147 CPUIF_MAP(ICH_AP0R3, ICH_AP0R3_EL2)
 148 CPUIF_MAP(ICH_AP0R2, ICH_AP0R2_EL2)
 149 CPUIF_MAP(ICH_AP0R1, ICH_AP0R1_EL2)
 150 CPUIF_MAP(ICH_AP0R0, ICH_AP0R0_EL2)
 151 CPUIF_MAP(ICH_AP1R3, ICH_AP1R3_EL2)
 152 CPUIF_MAP(ICH_AP1R2, ICH_AP1R2_EL2)
 153 CPUIF_MAP(ICH_AP1R1, ICH_AP1R1_EL2)
 154 CPUIF_MAP(ICH_AP1R0, ICH_AP1R0_EL2)
 155 CPUIF_MAP(ICC_HSRE, ICC_SRE_EL2)
 156 CPUIF_MAP(ICC_SRE, ICC_SRE_EL1)
 157
 158 CPUIF_MAP_LO_HI(ICH_LR15, ICH_LRC15, ICH_LR15_EL2)
 159 CPUIF_MAP_LO_HI(ICH_LR14, ICH_LRC14, ICH_LR14_EL2)
 160 CPUIF_MAP_LO_HI(ICH_LR13, ICH_LRC13, ICH_LR13_EL2)
 161 CPUIF_MAP_LO_HI(ICH_LR12, ICH_LRC12, ICH_LR12_EL2)
 162 CPUIF_MAP_LO_HI(ICH_LR11, ICH_LRC11, ICH_LR11_EL2)
 163 CPUIF_MAP_LO_HI(ICH_LR10, ICH_LRC10, ICH_LR10_EL2)
 164 CPUIF_MAP_LO_HI(ICH_LR9, ICH_LRC9, ICH_LR9_EL2)
 165 CPUIF_MAP_LO_HI(ICH_LR8, ICH_LRC8, ICH_LR8_EL2)
 166 CPUIF_MAP_LO_HI(ICH_LR7, ICH_LRC7, ICH_LR7_EL2)
 167 CPUIF_MAP_LO_HI(ICH_LR6, ICH_LRC6, ICH_LR6_EL2)
 168 CPUIF_MAP_LO_HI(ICH_LR5, ICH_LRC5, ICH_LR5_EL2)
 169 CPUIF_MAP_LO_HI(ICH_LR4, ICH_LRC4, ICH_LR4_EL2)
 170 CPUIF_MAP_LO_HI(ICH_LR3, ICH_LRC3, ICH_LR3_EL2)
 171 CPUIF_MAP_LO_HI(ICH_LR2, ICH_LRC2, ICH_LR2_EL2)
 172 CPUIF_MAP_LO_HI(ICH_LR1, ICH_LRC1, ICH_LR1_EL2)
 173 CPUIF_MAP_LO_HI(ICH_LR0, ICH_LRC0, ICH_LR0_EL2)
 174
 175 #define read_gicreg(r)                 read_##r()
 176 #define write_gicreg(v, r)             write_##r(v)
 177
 178 /* Low-level accessors */
 179
 180 static inline void gic_write_eoir(u32 irq)
 181 {
 182         write_sysreg(irq, ICC_EOIR1);
 183         isb();
 184 }
 185
 186 static inline void gic_write_dir(u32 val)
 187 {
 188         write_sysreg(val, ICC_DIR);
 189         isb();
 190 }
 191
 192 static inline u32 gic_read_iar(void)
 193 {
 194         u32 irqstat = read_sysreg(ICC_IAR1);
 195
 196         dsb(sy);
 197
 198         return irqstat;
 199 }
 200
 201 static inline void gic_write_ctlr(u32 val)
 202 {
 203         write_sysreg(val, ICC_CTLR);
 204         isb();
 205 }
 206
 207 static inline u32 gic_read_ctlr(void)
 208 {
 209         return read_sysreg(ICC_CTLR);
 210 }
 211
 212 static inline void gic_write_grpen1(u32 val)
 213 {
 214         write_sysreg(val, ICC_IGRPEN1);
 215         isb();
 216 }
 217
 218 static inline void gic_write_sgi1r(u64 val)
 219 {
 220         write_sysreg(val, ICC_SGI1R);
 221 }
 222
 223 static inline u32 gic_read_sre(void)
 224 {
 225         return read_sysreg(ICC_SRE);
 226 }
 227
 228 static inline void gic_write_sre(u32 val)
 229 {
 230         write_sysreg(val, ICC_SRE);
 231         isb();
 232 }
 233
 234 static inline void gic_write_bpr1(u32 val)
 235 {
 236         write_sysreg(val, ICC_BPR1);
 237 }
 238
 239 static inline u32 gic_read_pmr(void)
 240 {
 241         return read_sysreg(ICC_PMR);
 242 }
 243
 244 static inline void gic_write_pmr(u32 val)
 245 {
 246         write_sysreg(val, ICC_PMR);
 247 }
 248
 249 static inline u32 gic_read_rpr(void)
 250 {
 251         return read_sysreg(ICC_RPR);
 252 }
 253
 254 /*
 255  * Even in 32bit systems that use LPAE, there is no guarantee that the I/O
 256  * interface provides true 64bit atomic accesses, so using strd/ldrd doesn't
 257  * make much sense.
 258  * Moreover, 64bit I/O emulation is extremely difficult to implement on
 259  * AArch32, since the syndrome register doesn't provide any information for
 260  * them.
 261  * Consequently, the following IO helpers use 32bit accesses.
 262  */
 263 static inline void __gic_writeq_nonatomic(u64 val, volatile void __iomem *addr)
 264 {
 265         writel_relaxed((u32)val, addr);
 266         writel_relaxed((u32)(val >> 32), addr + 4);
 267 }
 268
 269 static inline u64 __gic_readq_nonatomic(const volatile void __iomem *addr)
 270 {
 271         u64 val;
 272
 273         val = readl_relaxed(addr);
 274         val |= (u64)readl_relaxed(addr + 4) << 32;
 275         return val;
 276 }
 277
 278 #define gic_flush_dcache_to_poc(a,l)    __cpuc_flush_dcache_area((a), (l))
 279
 280 /*
 281  *  GICD_IROUTERn, contain the affinity values associated to each interrupt.
 282  *  The upper-word (aff3) will always be 0, so there is no need for a lock.
 283  */
 284 #define gic_write_irouter(v, c)         __gic_writeq_nonatomic(v, c)
 285
 286 /*
 287  * GICR_TYPER is an ID register and doesn't need atomicity.
 288  */
 289 #define gic_read_typer(c)               __gic_readq_nonatomic(c)
 290
 291 /*
 292  * GITS_BASER - hi and lo bits may be accessed independently.
 293  */
 294 #define gits_read_baser(c)              __gic_readq_nonatomic(c)
 295 #define gits_write_baser(v, c)          __gic_writeq_nonatomic(v, c)
 296
 297 /*
 298  * GICR_PENDBASER and GICR_PROPBASE are changed with LPIs disabled, so they
 299  * won't be being used during any updates and can be changed non-atomically
 300  */
 301 #define gicr_read_propbaser(c)          __gic_readq_nonatomic(c)
 302 #define gicr_write_propbaser(v, c)      __gic_writeq_nonatomic(v, c)
 303 #define gicr_read_pendbaser(c)          __gic_readq_nonatomic(c)
 304 #define gicr_write_pendbaser(v, c)      __gic_writeq_nonatomic(v, c)
 305
 306 /*
 307  * GICR_xLPIR - only the lower bits are significant
 308  */
 309 #define gic_read_lpir(c)                readl_relaxed(c)
 310 #define gic_write_lpir(v, c)            writel_relaxed(lower_32_bits(v), c)
 311
 312 /*
 313  * GITS_TYPER is an ID register and doesn't need atomicity.
 314  */
 315 #define gits_read_typer(c)              __gic_readq_nonatomic(c)
 316
 317 /*
 318  * GITS_CBASER - hi and lo bits may be accessed independently.
 319  */
 320 #define gits_read_cbaser(c)             __gic_readq_nonatomic(c)
 321 #define gits_write_cbaser(v, c)         __gic_writeq_nonatomic(v, c)
 322
 323 /*
 324  * GITS_CWRITER - hi and lo bits may be accessed independently.
 325  */
 326 #define gits_write_cwriter(v, c)        __gic_writeq_nonatomic(v, c)
 327
 328 /*
 329  * GITS_VPROPBASER - hi and lo bits may be accessed independently.
 330  */
 331 #define gits_read_vpropbaser(c)         __gic_readq_nonatomic(c)
 332 #define gits_write_vpropbaser(v, c)     __gic_writeq_nonatomic(v, c)
 333
 334 /*
 335  * GITS_VPENDBASER - the Valid bit must be cleared before changing
 336  * anything else.
 337  */
 338 static inline void gits_write_vpendbaser(u64 val, void __iomem *addr)
 339 {
 340         u32 tmp;
 341
 342         tmp = readl_relaxed(addr + 4);
 343         if (tmp & (GICR_VPENDBASER_Valid >> 32)) {
 344                 tmp &= ~(GICR_VPENDBASER_Valid >> 32);
 345                 writel_relaxed(tmp, addr + 4);
 346         }
 347
 348         /*
 349          * Use the fact that __gic_writeq_nonatomic writes the second
 350          * half of the 64bit quantity after the first.
 351          */
 352         __gic_writeq_nonatomic(val, addr);
 353 }
 354
 355 #define gits_read_vpendbaser(c)         __gic_readq_nonatomic(c)
 356
 357 static inline bool gic_prio_masking_enabled(void)
 358 {
 359         return false;
 360 }
 361
 362 static inline void gic_pmr_mask_irqs(void)
 363 {
 364         /* Should not get called. */
 365         WARN_ON_ONCE(true);
 366 }
 367
 368 static inline void gic_arch_enable_irqs(void)
 369 {
 370         /* Should not get called. */
 371         WARN_ON_ONCE(true);
 372 }
 373
 374 #endif /* !__ASSEMBLY__ */
 375 #endif /* !__ASM_ARCH_GICV3_H */