LXR linux/arch/arm64/include/asm/arch

   1/*
   2 * arch/arm64/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#include <asm/sysreg.h>
  22
  23#ifndef __ASSEMBLY__
  24
  25#include <linux/stringify.h>
  26#include <asm/barrier.h>
  27#include <asm/cacheflush.h>
  28
  29#define read_gicreg(r)                  read_sysreg_s(SYS_ ## r)
  30#define write_gicreg(v, r)              write_sysreg_s(v, SYS_ ## r)
  31
  32/*
  33 * Low-level accessors
  34 *
  35 * These system registers are 32 bits, but we make sure that the compiler
  36 * sets the GP register's most significant bits to 0 with an explicit cast.
  37 */
  38
  39static inline void gic_write_eoir(u32 irq)
  40{
  41        write_sysreg_s(irq, SYS_ICC_EOIR1_EL1);
  42        isb();
  43}
  44
  45static inline void gic_write_dir(u32 irq)
  46{
  47        write_sysreg_s(irq, SYS_ICC_DIR_EL1);
  48        isb();
  49}
  50
  51static inline u64 gic_read_iar_common(void)
  52{
  53        u64 irqstat;
  54
  55        irqstat = read_sysreg_s(SYS_ICC_IAR1_EL1);
  56        dsb(sy);
  57        return irqstat;
  58}
  59
  60/*
  61 * Cavium ThunderX erratum 23154
  62 *
  63 * The gicv3 of ThunderX requires a modified version for reading the
  64 * IAR status to ensure data synchronization (access to icc_iar1_el1
  65 * is not sync'ed before and after).
  66 */
  67static inline u64 gic_read_iar_cavium_thunderx(void)
  68{
  69        u64 irqstat;
  70
  71        nops(8);
  72        irqstat = read_sysreg_s(SYS_ICC_IAR1_EL1);
  73        nops(4);
  74        mb();
  75
  76        return irqstat;
  77}
  78
  79static inline void gic_write_ctlr(u32 val)
  80{
  81        write_sysreg_s(val, SYS_ICC_CTLR_EL1);
  82        isb();
  83}
  84
  85static inline u32 gic_read_ctlr(void)
  86{
  87        return read_sysreg_s(SYS_ICC_CTLR_EL1);
  88}
  89
  90static inline void gic_write_grpen1(u32 val)
  91{
  92        write_sysreg_s(val, SYS_ICC_IGRPEN1_EL1);
  93        isb();
  94}
  95
  96static inline void gic_write_sgi1r(u64 val)
  97{
  98        write_sysreg_s(val, SYS_ICC_SGI1R_EL1);
  99}
 100
 101static inline u32 gic_read_sre(void)
 102{
 103        return read_sysreg_s(SYS_ICC_SRE_EL1);
 104}
 105
 106static inline void gic_write_sre(u32 val)
 107{
 108        write_sysreg_s(val, SYS_ICC_SRE_EL1);
 109        isb();
 110}
 111
 112static inline void gic_write_bpr1(u32 val)
 113{
 114        write_sysreg_s(val, SYS_ICC_BPR1_EL1);
 115}
 116
 117#define gic_read_typer(c)               readq_relaxed(c)
 118#define gic_write_irouter(v, c)         writeq_relaxed(v, c)
 119#define gic_read_lpir(c)                readq_relaxed(c)
 120#define gic_write_lpir(v, c)            writeq_relaxed(v, c)
 121
 122#define gic_flush_dcache_to_poc(a,l)    __flush_dcache_area((a), (l))
 123
 124#define gits_read_baser(c)              readq_relaxed(c)
 125#define gits_write_baser(v, c)          writeq_relaxed(v, c)
 126
 127#define gits_read_cbaser(c)             readq_relaxed(c)
 128#define gits_write_cbaser(v, c)         writeq_relaxed(v, c)
 129
 130#define gits_write_cwriter(v, c)        writeq_relaxed(v, c)
 131
 132#define gicr_read_propbaser(c)          readq_relaxed(c)
 133#define gicr_write_propbaser(v, c)      writeq_relaxed(v, c)
 134
 135#define gicr_write_pendbaser(v, c)      writeq_relaxed(v, c)
 136#define gicr_read_pendbaser(c)          readq_relaxed(c)
 137
 138#define gits_write_vpropbaser(v, c)     writeq_relaxed(v, c)
 139
 140#define gits_write_vpendbaser(v, c)     writeq_relaxed(v, c)
 141#define gits_read_vpendbaser(c)         readq_relaxed(c)
 142
 143#endif /* __ASSEMBLY__ */
 144#endif /* __ASM_ARCH_GICV3_H */
 145