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 inline void gic_write_eoir(u32 irq)
  30 {
  31         write_sysreg_s(irq, SYS_ICC_EOIR1_EL1);
  32         isb();
  33 }
  34
  35 static inline void gic_write_dir(u32 irq)
  36 {
  37         write_sysreg_s(irq, SYS_ICC_DIR_EL1);
  38         isb();
  39 }
  40
  41 static inline u64 gic_read_iar_common(void)
  42 {
  43         u64 irqstat;
  44
  45         irqstat = read_sysreg_s(SYS_ICC_IAR1_EL1);
  46         dsb(sy);
  47         return irqstat;
  48 }
  49
  50 /*
  51  * Cavium ThunderX erratum 23154
  52  *
  53  * The gicv3 of ThunderX requires a modified version for reading the
  54  * IAR status to ensure data synchronization (access to icc_iar1_el1
  55  * is not sync'ed before and after).
  56  */
  57 static inline u64 gic_read_iar_cavium_thunderx(void)
  58 {
  59         u64 irqstat;
  60
  61         nops(8);
  62         irqstat = read_sysreg_s(SYS_ICC_IAR1_EL1);
  63         nops(4);
  64         mb();
  65
  66         return irqstat;
  67 }
  68
  69 static inline void gic_write_ctlr(u32 val)
  70 {
  71         write_sysreg_s(val, SYS_ICC_CTLR_EL1);
  72         isb();
  73 }
  74
  75 static inline u32 gic_read_ctlr(void)
  76 {
  77         return read_sysreg_s(SYS_ICC_CTLR_EL1);
  78 }
  79
  80 static inline void gic_write_grpen1(u32 val)
  81 {
  82         write_sysreg_s(val, SYS_ICC_IGRPEN1_EL1);
  83         isb();
  84 }
  85
  86 static inline void gic_write_sgi1r(u64 val)
  87 {
  88         write_sysreg_s(val, SYS_ICC_SGI1R_EL1);
  89 }
  90
  91 static inline u32 gic_read_sre(void)
  92 {
  93         return read_sysreg_s(SYS_ICC_SRE_EL1);
  94 }
  95
  96 static inline void gic_write_sre(u32 val)
  97 {
  98         write_sysreg_s(val, SYS_ICC_SRE_EL1);
  99         isb();
 100 }
 101
 102 static inline void gic_write_bpr1(u32 val)
 103 {
 104         write_sysreg_s(val, SYS_ICC_BPR1_EL1);
 105 }
 106
 107 static inline u32 gic_read_pmr(void)
 108 {
 109         return read_sysreg_s(SYS_ICC_PMR_EL1);
 110 }
 111
 112 static inline void gic_write_pmr(u32 val)
 113 {
 114         write_sysreg_s(val, SYS_ICC_PMR_EL1);
 115 }
 116
 117 static inline u32 gic_read_rpr(void)
 118 {
 119         return read_sysreg_s(SYS_ICC_RPR_EL1);
 120 }
 121
 122 #define gic_read_typer(c)               readq_relaxed(c)
 123 #define gic_write_irouter(v, c)         writeq_relaxed(v, c)
 124 #define gic_read_lpir(c)                readq_relaxed(c)
 125 #define gic_write_lpir(v, c)            writeq_relaxed(v, c)
 126
 127 #define gic_flush_dcache_to_poc(a,l)    __flush_dcache_area((a), (l))
 128
 129 #define gits_read_baser(c)              readq_relaxed(c)
 130 #define gits_write_baser(v, c)          writeq_relaxed(v, c)
 131
 132 #define gits_read_cbaser(c)             readq_relaxed(c)
 133 #define gits_write_cbaser(v, c)         writeq_relaxed(v, c)
 134
 135 #define gits_write_cwriter(v, c)        writeq_relaxed(v, c)
 136
 137 #define gicr_read_propbaser(c)          readq_relaxed(c)
 138 #define gicr_write_propbaser(v, c)      writeq_relaxed(v, c)
 139
 140 #define gicr_write_pendbaser(v, c)      writeq_relaxed(v, c)
 141 #define gicr_read_pendbaser(c)          readq_relaxed(c)
 142
 143 #define gits_write_vpropbaser(v, c)     writeq_relaxed(v, c)
 144 #define gits_read_vpropbaser(c)         readq_relaxed(c)
 145
 146 #define gits_write_vpendbaser(v, c)     writeq_relaxed(v, c)
 147 #define gits_read_vpendbaser(c)         readq_relaxed(c)
 148
 149 static inline bool gic_prio_masking_enabled(void)
 150 {
 151         return system_uses_irq_prio_masking();
 152 }
 153
 154 static inline void gic_pmr_mask_irqs(void)
 155 {
 156         BUILD_BUG_ON(GICD_INT_DEF_PRI < (GIC_PRIO_IRQOFF |
 157                                          GIC_PRIO_PSR_I_SET));
 158         BUILD_BUG_ON(GICD_INT_DEF_PRI >= GIC_PRIO_IRQON);
 159         /*
 160          * Need to make sure IRQON allows IRQs when SCR_EL3.FIQ is cleared
 161          * and non-secure PMR accesses are not subject to the shifts that
 162          * are applied to IRQ priorities
 163          */
 164         BUILD_BUG_ON((0x80 | (GICD_INT_DEF_PRI >> 1)) >= GIC_PRIO_IRQON);
 165         gic_write_pmr(GIC_PRIO_IRQOFF);
 166 }
 167
 168 static inline void gic_arch_enable_irqs(void)
 169 {
 170         asm volatile ("msr daifclr, #2" : : : "memory");
 171 }
 172
 173 #endif /* __ASSEMBLY__ */
 174 #endif /* __ASM_ARCH_GICV3_H */