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
  38 #define ICC_HSRE                        __ACCESS_CP15(c12, 4, c9, 5)
  39
  40 #define ICH_VSEIR                       __ACCESS_CP15(c12, 4, c9, 4)
  41 #define ICH_HCR                         __ACCESS_CP15(c12, 4, c11, 0)
  42 #define ICH_VTR                         __ACCESS_CP15(c12, 4, c11, 1)
  43 #define ICH_MISR                        __ACCESS_CP15(c12, 4, c11, 2)
  44 #define ICH_EISR                        __ACCESS_CP15(c12, 4, c11, 3)
  45 #define ICH_ELSR                        __ACCESS_CP15(c12, 4, c11, 5)
  46 #define ICH_VMCR                        __ACCESS_CP15(c12, 4, c11, 7)
  47
  48 #define __LR0(x)                        __ACCESS_CP15(c12, 4, c12, x)
  49 #define __LR8(x)                        __ACCESS_CP15(c12, 4, c13, x)
  50
  51 #define ICH_LR0                         __LR0(0)
  52 #define ICH_LR1                         __LR0(1)
  53 #define ICH_LR2                         __LR0(2)
  54 #define ICH_LR3                         __LR0(3)
  55 #define ICH_LR4                         __LR0(4)
  56 #define ICH_LR5                         __LR0(5)
  57 #define ICH_LR6                         __LR0(6)
  58 #define ICH_LR7                         __LR0(7)
  59 #define ICH_LR8                         __LR8(0)
  60 #define ICH_LR9                         __LR8(1)
  61 #define ICH_LR10                        __LR8(2)
  62 #define ICH_LR11                        __LR8(3)
  63 #define ICH_LR12                        __LR8(4)
  64 #define ICH_LR13                        __LR8(5)
  65 #define ICH_LR14                        __LR8(6)
  66 #define ICH_LR15                        __LR8(7)
  67
  68 /* LR top half */
  69 #define __LRC0(x)                       __ACCESS_CP15(c12, 4, c14, x)
  70 #define __LRC8(x)                       __ACCESS_CP15(c12, 4, c15, x)
  71
  72 #define ICH_LRC0                        __LRC0(0)
  73 #define ICH_LRC1                        __LRC0(1)
  74 #define ICH_LRC2                        __LRC0(2)
  75 #define ICH_LRC3                        __LRC0(3)
  76 #define ICH_LRC4                        __LRC0(4)
  77 #define ICH_LRC5                        __LRC0(5)
  78 #define ICH_LRC6                        __LRC0(6)
  79 #define ICH_LRC7                        __LRC0(7)
  80 #define ICH_LRC8                        __LRC8(0)
  81 #define ICH_LRC9                        __LRC8(1)
  82 #define ICH_LRC10                       __LRC8(2)
  83 #define ICH_LRC11                       __LRC8(3)
  84 #define ICH_LRC12                       __LRC8(4)
  85 #define ICH_LRC13                       __LRC8(5)
  86 #define ICH_LRC14                       __LRC8(6)
  87 #define ICH_LRC15                       __LRC8(7)
  88
  89 #define __AP0Rx(x)                      __ACCESS_CP15(c12, 4, c8, x)
  90 #define ICH_AP0R0                       __AP0Rx(0)
  91 #define ICH_AP0R1                       __AP0Rx(1)
  92 #define ICH_AP0R2                       __AP0Rx(2)
  93 #define ICH_AP0R3                       __AP0Rx(3)
  94
  95 #define __AP1Rx(x)                      __ACCESS_CP15(c12, 4, c9, x)
  96 #define ICH_AP1R0                       __AP1Rx(0)
  97 #define ICH_AP1R1                       __AP1Rx(1)
  98 #define ICH_AP1R2                       __AP1Rx(2)
  99 #define ICH_AP1R3                       __AP1Rx(3)
 100
 101 /* A32-to-A64 mappings used by VGIC save/restore */
 102
 103 #define CPUIF_MAP(a32, a64)                     \
 104 static inline void write_ ## a64(u32 val)       \
 105 {                                               \
 106         write_sysreg(val, a32);                 \
 107 }                                               \
 108 static inline u32 read_ ## a64(void)            \
 109 {                                               \
 110         return read_sysreg(a32);                \
 111 }                                               \
 112
 113 #define CPUIF_MAP_LO_HI(a32lo, a32hi, a64)      \
 114 static inline void write_ ## a64(u64 val)       \
 115 {                                               \
 116         write_sysreg(lower_32_bits(val), a32lo);\
 117         write_sysreg(upper_32_bits(val), a32hi);\
 118 }                                               \
 119 static inline u64 read_ ## a64(void)            \
 120 {                                               \
 121         u64 val = read_sysreg(a32lo);           \
 122                                                 \
 123         val |=  (u64)read_sysreg(a32hi) << 32;  \
 124                                                 \
 125         return val;                             \
 126 }
 127
 128 CPUIF_MAP(ICH_HCR, ICH_HCR_EL2)
 129 CPUIF_MAP(ICH_VTR, ICH_VTR_EL2)
 130 CPUIF_MAP(ICH_MISR, ICH_MISR_EL2)
 131 CPUIF_MAP(ICH_EISR, ICH_EISR_EL2)
 132 CPUIF_MAP(ICH_ELSR, ICH_ELSR_EL2)
 133 CPUIF_MAP(ICH_VMCR, ICH_VMCR_EL2)
 134 CPUIF_MAP(ICH_AP0R3, ICH_AP0R3_EL2)
 135 CPUIF_MAP(ICH_AP0R2, ICH_AP0R2_EL2)
 136 CPUIF_MAP(ICH_AP0R1, ICH_AP0R1_EL2)
 137 CPUIF_MAP(ICH_AP0R0, ICH_AP0R0_EL2)
 138 CPUIF_MAP(ICH_AP1R3, ICH_AP1R3_EL2)
 139 CPUIF_MAP(ICH_AP1R2, ICH_AP1R2_EL2)
 140 CPUIF_MAP(ICH_AP1R1, ICH_AP1R1_EL2)
 141 CPUIF_MAP(ICH_AP1R0, ICH_AP1R0_EL2)
 142 CPUIF_MAP(ICC_HSRE, ICC_SRE_EL2)
 143 CPUIF_MAP(ICC_SRE, ICC_SRE_EL1)
 144
 145 CPUIF_MAP_LO_HI(ICH_LR15, ICH_LRC15, ICH_LR15_EL2)
 146 CPUIF_MAP_LO_HI(ICH_LR14, ICH_LRC14, ICH_LR14_EL2)
 147 CPUIF_MAP_LO_HI(ICH_LR13, ICH_LRC13, ICH_LR13_EL2)
 148 CPUIF_MAP_LO_HI(ICH_LR12, ICH_LRC12, ICH_LR12_EL2)
 149 CPUIF_MAP_LO_HI(ICH_LR11, ICH_LRC11, ICH_LR11_EL2)
 150 CPUIF_MAP_LO_HI(ICH_LR10, ICH_LRC10, ICH_LR10_EL2)
 151 CPUIF_MAP_LO_HI(ICH_LR9, ICH_LRC9, ICH_LR9_EL2)
 152 CPUIF_MAP_LO_HI(ICH_LR8, ICH_LRC8, ICH_LR8_EL2)
 153 CPUIF_MAP_LO_HI(ICH_LR7, ICH_LRC7, ICH_LR7_EL2)
 154 CPUIF_MAP_LO_HI(ICH_LR6, ICH_LRC6, ICH_LR6_EL2)
 155 CPUIF_MAP_LO_HI(ICH_LR5, ICH_LRC5, ICH_LR5_EL2)
 156 CPUIF_MAP_LO_HI(ICH_LR4, ICH_LRC4, ICH_LR4_EL2)
 157 CPUIF_MAP_LO_HI(ICH_LR3, ICH_LRC3, ICH_LR3_EL2)
 158 CPUIF_MAP_LO_HI(ICH_LR2, ICH_LRC2, ICH_LR2_EL2)
 159 CPUIF_MAP_LO_HI(ICH_LR1, ICH_LRC1, ICH_LR1_EL2)
 160 CPUIF_MAP_LO_HI(ICH_LR0, ICH_LRC0, ICH_LR0_EL2)
 161
 162 #define read_gicreg(r)                 read_##r()
 163 #define write_gicreg(v, r)             write_##r(v)
 164
 165 /* Low-level accessors */
 166
 167 static inline void gic_write_eoir(u32 irq)
 168 {
 169         write_sysreg(irq, ICC_EOIR1);
 170         isb();
 171 }
 172
 173 static inline void gic_write_dir(u32 val)
 174 {
 175         write_sysreg(val, ICC_DIR);
 176         isb();
 177 }
 178
 179 static inline u32 gic_read_iar(void)
 180 {
 181         u32 irqstat = read_sysreg(ICC_IAR1);
 182
 183         dsb(sy);
 184
 185         return irqstat;
 186 }
 187
 188 static inline void gic_write_pmr(u32 val)
 189 {
 190         write_sysreg(val, ICC_PMR);
 191 }
 192
 193 static inline void gic_write_ctlr(u32 val)
 194 {
 195         write_sysreg(val, ICC_CTLR);
 196         isb();
 197 }
 198
 199 static inline void gic_write_grpen1(u32 val)
 200 {
 201         write_sysreg(val, ICC_IGRPEN1);
 202         isb();
 203 }
 204
 205 static inline void gic_write_sgi1r(u64 val)
 206 {
 207         write_sysreg(val, ICC_SGI1R);
 208 }
 209
 210 static inline u32 gic_read_sre(void)
 211 {
 212         return read_sysreg(ICC_SRE);
 213 }
 214
 215 static inline void gic_write_sre(u32 val)
 216 {
 217         write_sysreg(val, ICC_SRE);
 218         isb();
 219 }
 220
 221 static inline void gic_write_bpr1(u32 val)
 222 {
 223         write_sysreg(val, ICC_BPR1);
 224 }
 225
 226 /*
 227  * Even in 32bit systems that use LPAE, there is no guarantee that the I/O
 228  * interface provides true 64bit atomic accesses, so using strd/ldrd doesn't
 229  * make much sense.
 230  * Moreover, 64bit I/O emulation is extremely difficult to implement on
 231  * AArch32, since the syndrome register doesn't provide any information for
 232  * them.
 233  * Consequently, the following IO helpers use 32bit accesses.
 234  */
 235 static inline void __gic_writeq_nonatomic(u64 val, volatile void __iomem *addr)
 236 {
 237         writel_relaxed((u32)val, addr);
 238         writel_relaxed((u32)(val >> 32), addr + 4);
 239 }
 240
 241 static inline u64 __gic_readq_nonatomic(const volatile void __iomem *addr)
 242 {
 243         u64 val;
 244
 245         val = readl_relaxed(addr);
 246         val |= (u64)readl_relaxed(addr + 4) << 32;
 247         return val;
 248 }
 249
 250 #define gic_flush_dcache_to_poc(a,l)    __cpuc_flush_dcache_area((a), (l))
 251
 252 /*
 253  *  GICD_IROUTERn, contain the affinity values associated to each interrupt.
 254  *  The upper-word (aff3) will always be 0, so there is no need for a lock.
 255  */
 256 #define gic_write_irouter(v, c)         __gic_writeq_nonatomic(v, c)
 257
 258 /*
 259  * GICR_TYPER is an ID register and doesn't need atomicity.
 260  */
 261 #define gic_read_typer(c)               __gic_readq_nonatomic(c)
 262
 263 /*
 264  * GITS_BASER - hi and lo bits may be accessed independently.
 265  */
 266 #define gits_read_baser(c)              __gic_readq_nonatomic(c)
 267 #define gits_write_baser(v, c)          __gic_writeq_nonatomic(v, c)
 268
 269 /*
 270  * GICR_PENDBASER and GICR_PROPBASE are changed with LPIs disabled, so they
 271  * won't be being used during any updates and can be changed non-atomically
 272  */
 273 #define gicr_read_propbaser(c)          __gic_readq_nonatomic(c)
 274 #define gicr_write_propbaser(v, c)      __gic_writeq_nonatomic(v, c)
 275 #define gicr_read_pendbaser(c)          __gic_readq_nonatomic(c)
 276 #define gicr_write_pendbaser(v, c)      __gic_writeq_nonatomic(v, c)
 277
 278 /*
 279  * GICR_xLPIR - only the lower bits are significant
 280  */
 281 #define gic_read_lpir(c)                readl_relaxed(c)
 282 #define gic_write_lpir(v, c)            writel_relaxed(lower_32_bits(v), c)
 283
 284 /*
 285  * GITS_TYPER is an ID register and doesn't need atomicity.
 286  */
 287 #define gits_read_typer(c)              __gic_readq_nonatomic(c)
 288
 289 /*
 290  * GITS_CBASER - hi and lo bits may be accessed independently.
 291  */
 292 #define gits_read_cbaser(c)             __gic_readq_nonatomic(c)
 293 #define gits_write_cbaser(v, c)         __gic_writeq_nonatomic(v, c)
 294
 295 /*
 296  * GITS_CWRITER - hi and lo bits may be accessed independently.
 297  */
 298 #define gits_write_cwriter(v, c)        __gic_writeq_nonatomic(v, c)
 299
 300 /*
 301  * GITS_VPROPBASER - hi and lo bits may be accessed independently.
 302  */
 303 #define gits_write_vpropbaser(v, c)     __gic_writeq_nonatomic(v, c)
 304
 305 /*
 306  * GITS_VPENDBASER - the Valid bit must be cleared before changing
 307  * anything else.
 308  */
 309 static inline void gits_write_vpendbaser(u64 val, void * __iomem addr)
 310 {
 311         u32 tmp;
 312
 313         tmp = readl_relaxed(addr + 4);
 314         if (tmp & (GICR_VPENDBASER_Valid >> 32)) {
 315                 tmp &= ~(GICR_VPENDBASER_Valid >> 32);
 316                 writel_relaxed(tmp, addr + 4);
 317         }
 318
 319         /*
 320          * Use the fact that __gic_writeq_nonatomic writes the second
 321          * half of the 64bit quantity after the first.
 322          */
 323         __gic_writeq_nonatomic(val, addr);
 324 }
 325
 326 #define gits_read_vpendbaser(c)         __gic_readq_nonatomic(c)
 327
 328 #endif /* !__ASSEMBLY__ */
 329 #endif /* !__ASM_ARCH_GICV3_H */