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 #include <asm/cacheflush.h>
  26 #include <asm/cp15.h>
  27
  28 #define ICC_EOIR1                       __ACCESS_CP15(c12, 0, c12, 1)
  29 #define ICC_DIR                         __ACCESS_CP15(c12, 0, c11, 1)
  30 #define ICC_IAR1                        __ACCESS_CP15(c12, 0, c12, 0)
  31 #define ICC_SGI1R                       __ACCESS_CP15_64(0, c12)
  32 #define ICC_PMR                         __ACCESS_CP15(c4, 0, c6, 0)
  33 #define ICC_CTLR                        __ACCESS_CP15(c12, 0, c12, 4)
  34 #define ICC_SRE                         __ACCESS_CP15(c12, 0, c12, 5)
  35 #define ICC_IGRPEN1                     __ACCESS_CP15(c12, 0, c12, 7)
  36 #define ICC_BPR1                        __ACCESS_CP15(c12, 0, c12, 3)
  37 #define ICC_RPR                         __ACCESS_CP15(c12, 0, c11, 3)
  38
  39 #define __ICC_AP0Rx(x)                  __ACCESS_CP15(c12, 0, c8, 4 | x)
  40 #define ICC_AP0R0                       __ICC_AP0Rx(0)
  41 #define ICC_AP0R1                       __ICC_AP0Rx(1)
  42 #define ICC_AP0R2                       __ICC_AP0Rx(2)
  43 #define ICC_AP0R3                       __ICC_AP0Rx(3)
  44
  45 #define __ICC_AP1Rx(x)                  __ACCESS_CP15(c12, 0, c9, x)
  46 #define ICC_AP1R0                       __ICC_AP1Rx(0)
  47 #define ICC_AP1R1                       __ICC_AP1Rx(1)
  48 #define ICC_AP1R2                       __ICC_AP1Rx(2)
  49 #define ICC_AP1R3                       __ICC_AP1Rx(3)
  50
  51 #define ICC_HSRE                        __ACCESS_CP15(c12, 4, c9, 5)
  52
  53 #define ICH_VSEIR                       __ACCESS_CP15(c12, 4, c9, 4)
  54 #define ICH_HCR                         __ACCESS_CP15(c12, 4, c11, 0)
  55 #define ICH_VTR                         __ACCESS_CP15(c12, 4, c11, 1)
  56 #define ICH_MISR                        __ACCESS_CP15(c12, 4, c11, 2)
  57 #define ICH_EISR                        __ACCESS_CP15(c12, 4, c11, 3)
  58 #define ICH_ELSR                        __ACCESS_CP15(c12, 4, c11, 5)
  59 #define ICH_VMCR                        __ACCESS_CP15(c12, 4, c11, 7)
  60
  61 #define __LR0(x)                        __ACCESS_CP15(c12, 4, c12, x)
  62 #define __LR8(x)                        __ACCESS_CP15(c12, 4, c13, x)
  63
  64 #define ICH_LR0                         __LR0(0)
  65 #define ICH_LR1                         __LR0(1)
  66 #define ICH_LR2                         __LR0(2)
  67 #define ICH_LR3                         __LR0(3)
  68 #define ICH_LR4                         __LR0(4)
  69 #define ICH_LR5                         __LR0(5)
  70 #define ICH_LR6                         __LR0(6)
  71 #define ICH_LR7                         __LR0(7)
  72 #define ICH_LR8                         __LR8(0)
  73 #define ICH_LR9                         __LR8(1)
  74 #define ICH_LR10                        __LR8(2)
  75 #define ICH_LR11                        __LR8(3)
  76 #define ICH_LR12                        __LR8(4)
  77 #define ICH_LR13                        __LR8(5)
  78 #define ICH_LR14                        __LR8(6)
  79 #define ICH_LR15                        __LR8(7)
  80
  81 /* LR top half */
  82 #define __LRC0(x)                       __ACCESS_CP15(c12, 4, c14, x)
  83 #define __LRC8(x)                       __ACCESS_CP15(c12, 4, c15, x)
  84
  85 #define ICH_LRC0                        __LRC0(0)
  86 #define ICH_LRC1                        __LRC0(1)
  87 #define ICH_LRC2                        __LRC0(2)
  88 #define ICH_LRC3                        __LRC0(3)
  89 #define ICH_LRC4                        __LRC0(4)
  90 #define ICH_LRC5                        __LRC0(5)
  91 #define ICH_LRC6                        __LRC0(6)
  92 #define ICH_LRC7                        __LRC0(7)
  93 #define ICH_LRC8                        __LRC8(0)
  94 #define ICH_LRC9                        __LRC8(1)
  95 #define ICH_LRC10                       __LRC8(2)
  96 #define ICH_LRC11                       __LRC8(3)
  97 #define ICH_LRC12                       __LRC8(4)
  98 #define ICH_LRC13                       __LRC8(5)
  99 #define ICH_LRC14                       __LRC8(6)
 100 #define ICH_LRC15                       __LRC8(7)
 101
 102 #define __ICH_AP0Rx(x)                  __ACCESS_CP15(c12, 4, c8, x)
 103 #define ICH_AP0R0                       __ICH_AP0Rx(0)
 104 #define ICH_AP0R1                       __ICH_AP0Rx(1)
 105 #define ICH_AP0R2                       __ICH_AP0Rx(2)
 106 #define ICH_AP0R3                       __ICH_AP0Rx(3)
 107
 108 #define __ICH_AP1Rx(x)                  __ACCESS_CP15(c12, 4, c9, x)
 109 #define ICH_AP1R0                       __ICH_AP1Rx(0)
 110 #define ICH_AP1R1                       __ICH_AP1Rx(1)
 111 #define ICH_AP1R2                       __ICH_AP1Rx(2)
 112 #define ICH_AP1R3                       __ICH_AP1Rx(3)
 113
 114 /* A32-to-A64 mappings used by VGIC save/restore */
 115
 116 #define CPUIF_MAP(a32, a64)                     \
 117 static inline void write_ ## a64(u32 val)       \
 118 {                                               \
 119         write_sysreg(val, a32);                 \
 120 }                                               \
 121 static inline u32 read_ ## a64(void)            \
 122 {                                               \
 123         return read_sysreg(a32);                \
 124 }                                               \
 125
 126 #define CPUIF_MAP_LO_HI(a32lo, a32hi, a64)      \
 127 static inline void write_ ## a64(u64 val)       \
 128 {                                               \
 129         write_sysreg(lower_32_bits(val), a32lo);\
 130         write_sysreg(upper_32_bits(val), a32hi);\
 131 }                                               \
 132 static inline u64 read_ ## a64(void)            \
 133 {                                               \
 134         u64 val = read_sysreg(a32lo);           \
 135                                                 \
 136         val |=  (u64)read_sysreg(a32hi) << 32;  \
 137                                                 \
 138         return val;                             \
 139 }
 140
 141 CPUIF_MAP(ICC_PMR, ICC_PMR_EL1)
 142 CPUIF_MAP(ICC_AP0R0, ICC_AP0R0_EL1)
 143 CPUIF_MAP(ICC_AP0R1, ICC_AP0R1_EL1)
 144 CPUIF_MAP(ICC_AP0R2, ICC_AP0R2_EL1)
 145 CPUIF_MAP(ICC_AP0R3, ICC_AP0R3_EL1)
 146 CPUIF_MAP(ICC_AP1R0, ICC_AP1R0_EL1)
 147 CPUIF_MAP(ICC_AP1R1, ICC_AP1R1_EL1)
 148 CPUIF_MAP(ICC_AP1R2, ICC_AP1R2_EL1)
 149 CPUIF_MAP(ICC_AP1R3, ICC_AP1R3_EL1)
 150
 151 CPUIF_MAP(ICH_HCR, ICH_HCR_EL2)
 152 CPUIF_MAP(ICH_VTR, ICH_VTR_EL2)
 153 CPUIF_MAP(ICH_MISR, ICH_MISR_EL2)
 154 CPUIF_MAP(ICH_EISR, ICH_EISR_EL2)
 155 CPUIF_MAP(ICH_ELSR, ICH_ELSR_EL2)
 156 CPUIF_MAP(ICH_VMCR, ICH_VMCR_EL2)
 157 CPUIF_MAP(ICH_AP0R3, ICH_AP0R3_EL2)
 158 CPUIF_MAP(ICH_AP0R2, ICH_AP0R2_EL2)
 159 CPUIF_MAP(ICH_AP0R1, ICH_AP0R1_EL2)
 160 CPUIF_MAP(ICH_AP0R0, ICH_AP0R0_EL2)
 161 CPUIF_MAP(ICH_AP1R3, ICH_AP1R3_EL2)
 162 CPUIF_MAP(ICH_AP1R2, ICH_AP1R2_EL2)
 163 CPUIF_MAP(ICH_AP1R1, ICH_AP1R1_EL2)
 164 CPUIF_MAP(ICH_AP1R0, ICH_AP1R0_EL2)
 165 CPUIF_MAP(ICC_HSRE, ICC_SRE_EL2)
 166 CPUIF_MAP(ICC_SRE, ICC_SRE_EL1)
 167
 168 CPUIF_MAP_LO_HI(ICH_LR15, ICH_LRC15, ICH_LR15_EL2)
 169 CPUIF_MAP_LO_HI(ICH_LR14, ICH_LRC14, ICH_LR14_EL2)
 170 CPUIF_MAP_LO_HI(ICH_LR13, ICH_LRC13, ICH_LR13_EL2)
 171 CPUIF_MAP_LO_HI(ICH_LR12, ICH_LRC12, ICH_LR12_EL2)
 172 CPUIF_MAP_LO_HI(ICH_LR11, ICH_LRC11, ICH_LR11_EL2)
 173 CPUIF_MAP_LO_HI(ICH_LR10, ICH_LRC10, ICH_LR10_EL2)
 174 CPUIF_MAP_LO_HI(ICH_LR9, ICH_LRC9, ICH_LR9_EL2)
 175 CPUIF_MAP_LO_HI(ICH_LR8, ICH_LRC8, ICH_LR8_EL2)
 176 CPUIF_MAP_LO_HI(ICH_LR7, ICH_LRC7, ICH_LR7_EL2)
 177 CPUIF_MAP_LO_HI(ICH_LR6, ICH_LRC6, ICH_LR6_EL2)
 178 CPUIF_MAP_LO_HI(ICH_LR5, ICH_LRC5, ICH_LR5_EL2)
 179 CPUIF_MAP_LO_HI(ICH_LR4, ICH_LRC4, ICH_LR4_EL2)
 180 CPUIF_MAP_LO_HI(ICH_LR3, ICH_LRC3, ICH_LR3_EL2)
 181 CPUIF_MAP_LO_HI(ICH_LR2, ICH_LRC2, ICH_LR2_EL2)
 182 CPUIF_MAP_LO_HI(ICH_LR1, ICH_LRC1, ICH_LR1_EL2)
 183 CPUIF_MAP_LO_HI(ICH_LR0, ICH_LRC0, ICH_LR0_EL2)
 184
 185 #define read_gicreg(r)                 read_##r()
 186 #define write_gicreg(v, r)             write_##r(v)
 187
 188 /* Low-level accessors */
 189
 190 static inline void gic_write_eoir(u32 irq)
 191 {
 192         write_sysreg(irq, ICC_EOIR1);
 193         isb();
 194 }
 195
 196 static inline void gic_write_dir(u32 val)
 197 {
 198         write_sysreg(val, ICC_DIR);
 199         isb();
 200 }
 201
 202 static inline u32 gic_read_iar(void)
 203 {
 204         u32 irqstat = read_sysreg(ICC_IAR1);
 205
 206         dsb(sy);
 207
 208         return irqstat;
 209 }
 210
 211 static inline void gic_write_ctlr(u32 val)
 212 {
 213         write_sysreg(val, ICC_CTLR);
 214         isb();
 215 }
 216
 217 static inline u32 gic_read_ctlr(void)
 218 {
 219         return read_sysreg(ICC_CTLR);
 220 }
 221
 222 static inline void gic_write_grpen1(u32 val)
 223 {
 224         write_sysreg(val, ICC_IGRPEN1);
 225         isb();
 226 }
 227
 228 static inline void gic_write_sgi1r(u64 val)
 229 {
 230         write_sysreg(val, ICC_SGI1R);
 231 }
 232
 233 static inline u32 gic_read_sre(void)
 234 {
 235         return read_sysreg(ICC_SRE);
 236 }
 237
 238 static inline void gic_write_sre(u32 val)
 239 {
 240         write_sysreg(val, ICC_SRE);
 241         isb();
 242 }
 243
 244 static inline void gic_write_bpr1(u32 val)
 245 {
 246         write_sysreg(val, ICC_BPR1);
 247 }
 248
 249 static inline u32 gic_read_pmr(void)
 250 {
 251         return read_sysreg(ICC_PMR);
 252 }
 253
 254 static inline void gic_write_pmr(u32 val)
 255 {
 256         write_sysreg(val, ICC_PMR);
 257 }
 258
 259 static inline u32 gic_read_rpr(void)
 260 {
 261         return read_sysreg(ICC_RPR);
 262 }
 263
 264 /*
 265  * Even in 32bit systems that use LPAE, there is no guarantee that the I/O
 266  * interface provides true 64bit atomic accesses, so using strd/ldrd doesn't
 267  * make much sense.
 268  * Moreover, 64bit I/O emulation is extremely difficult to implement on
 269  * AArch32, since the syndrome register doesn't provide any information for
 270  * them.
 271  * Consequently, the following IO helpers use 32bit accesses.
 272  */
 273 static inline void __gic_writeq_nonatomic(u64 val, volatile void __iomem *addr)
 274 {
 275         writel_relaxed((u32)val, addr);
 276         writel_relaxed((u32)(val >> 32), addr + 4);
 277 }
 278
 279 static inline u64 __gic_readq_nonatomic(const volatile void __iomem *addr)
 280 {
 281         u64 val;
 282
 283         val = readl_relaxed(addr);
 284         val |= (u64)readl_relaxed(addr + 4) << 32;
 285         return val;
 286 }
 287
 288 #define gic_flush_dcache_to_poc(a,l)    __cpuc_flush_dcache_area((a), (l))
 289
 290 /*
 291  *  GICD_IROUTERn, contain the affinity values associated to each interrupt.
 292  *  The upper-word (aff3) will always be 0, so there is no need for a lock.
 293  */
 294 #define gic_write_irouter(v, c)         __gic_writeq_nonatomic(v, c)
 295
 296 /*
 297  * GICR_TYPER is an ID register and doesn't need atomicity.
 298  */
 299 #define gic_read_typer(c)               __gic_readq_nonatomic(c)
 300
 301 /*
 302  * GITS_BASER - hi and lo bits may be accessed independently.
 303  */
 304 #define gits_read_baser(c)              __gic_readq_nonatomic(c)
 305 #define gits_write_baser(v, c)          __gic_writeq_nonatomic(v, c)
 306
 307 /*
 308  * GICR_PENDBASER and GICR_PROPBASE are changed with LPIs disabled, so they
 309  * won't be being used during any updates and can be changed non-atomically
 310  */
 311 #define gicr_read_propbaser(c)          __gic_readq_nonatomic(c)
 312 #define gicr_write_propbaser(v, c)      __gic_writeq_nonatomic(v, c)
 313 #define gicr_read_pendbaser(c)          __gic_readq_nonatomic(c)
 314 #define gicr_write_pendbaser(v, c)      __gic_writeq_nonatomic(v, c)
 315
 316 /*
 317  * GICR_xLPIR - only the lower bits are significant
 318  */
 319 #define gic_read_lpir(c)                readl_relaxed(c)
 320 #define gic_write_lpir(v, c)            writel_relaxed(lower_32_bits(v), c)
 321
 322 /*
 323  * GITS_TYPER is an ID register and doesn't need atomicity.
 324  */
 325 #define gits_read_typer(c)              __gic_readq_nonatomic(c)
 326
 327 /*
 328  * GITS_CBASER - hi and lo bits may be accessed independently.
 329  */
 330 #define gits_read_cbaser(c)             __gic_readq_nonatomic(c)
 331 #define gits_write_cbaser(v, c)         __gic_writeq_nonatomic(v, c)
 332
 333 /*
 334  * GITS_CWRITER - hi and lo bits may be accessed independently.
 335  */
 336 #define gits_write_cwriter(v, c)        __gic_writeq_nonatomic(v, c)
 337
 338 /*
 339  * GITS_VPROPBASER - hi and lo bits may be accessed independently.
 340  */
 341 #define gits_write_vpropbaser(v, c)     __gic_writeq_nonatomic(v, c)
 342
 343 /*
 344  * GITS_VPENDBASER - the Valid bit must be cleared before changing
 345  * anything else.
 346  */
 347 static inline void gits_write_vpendbaser(u64 val, void * __iomem addr)
 348 {
 349         u32 tmp;
 350
 351         tmp = readl_relaxed(addr + 4);
 352         if (tmp & (GICR_VPENDBASER_Valid >> 32)) {
 353                 tmp &= ~(GICR_VPENDBASER_Valid >> 32);
 354                 writel_relaxed(tmp, addr + 4);
 355         }
 356
 357         /*
 358          * Use the fact that __gic_writeq_nonatomic writes the second
 359          * half of the 64bit quantity after the first.
 360          */
 361         __gic_writeq_nonatomic(val, addr);
 362 }
 363
 364 #define gits_read_vpendbaser(c)         __gic_readq_nonatomic(c)
 365
 366 static inline bool gic_prio_masking_enabled(void)
 367 {
 368         return false;
 369 }
 370
 371 static inline void gic_pmr_mask_irqs(void)
 372 {
 373         /* Should not get called. */
 374         WARN_ON_ONCE(true);
 375 }
 376
 377 static inline void gic_arch_enable_irqs(void)
 378 {
 379         /* Should not get called. */
 380         WARN_ON_ONCE(true);
 381 }
 382
 383 #endif /* !__ASSEMBLY__ */
 384 #endif /* !__ASM_ARCH_GICV3_H */