/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * arch/arm/include/asm/arch_gicv3.h
 *
 * Copyright (C) 2015 ARM Ltd.
 */
#ifndef __ASM_ARCH_GICV3_H
#define __ASM_ARCH_GICV3_H

#ifndef __ASSEMBLY__

#include <linux/io.h>
#include <linux/io-64-nonatomic-lo-hi.h>
#include <asm/barrier.h>
#include <asm/cacheflush.h>
#include <asm/cp15.h>

#define ICC_EOIR1                       __ACCESS_CP15(c12, 0, c12, 1)
#define ICC_DIR                         __ACCESS_CP15(c12, 0, c11, 1)
#define ICC_IAR1                        __ACCESS_CP15(c12, 0, c12, 0)
#define ICC_SGI1R                       __ACCESS_CP15_64(0, c12)
#define ICC_PMR                         __ACCESS_CP15(c4, 0, c6, 0)
#define ICC_CTLR                        __ACCESS_CP15(c12, 0, c12, 4)
#define ICC_SRE                         __ACCESS_CP15(c12, 0, c12, 5)
#define ICC_IGRPEN1                     __ACCESS_CP15(c12, 0, c12, 7)
#define ICC_BPR1                        __ACCESS_CP15(c12, 0, c12, 3)
#define ICC_RPR                         __ACCESS_CP15(c12, 0, c11, 3)

#define __ICC_AP0Rx(x)                  __ACCESS_CP15(c12, 0, c8, 4 | x)
#define ICC_AP0R0                       __ICC_AP0Rx(0)
#define ICC_AP0R1                       __ICC_AP0Rx(1)
#define ICC_AP0R2                       __ICC_AP0Rx(2)
#define ICC_AP0R3                       __ICC_AP0Rx(3)

#define __ICC_AP1Rx(x)                  __ACCESS_CP15(c12, 0, c9, x)
#define ICC_AP1R0                       __ICC_AP1Rx(0)
#define ICC_AP1R1                       __ICC_AP1Rx(1)
#define ICC_AP1R2                       __ICC_AP1Rx(2)
#define ICC_AP1R3                       __ICC_AP1Rx(3)

#define CPUIF_MAP(a32, a64)                     \
static inline void write_ ## a64(u32 val)       \
{                                               \
        write_sysreg(val, a32);                 \
}                                               \
static inline u32 read_ ## a64(void)            \
{                                               \
        return read_sysreg(a32);                \
}                                               \

CPUIF_MAP(ICC_PMR, ICC_PMR_EL1)
CPUIF_MAP(ICC_AP0R0, ICC_AP0R0_EL1)
CPUIF_MAP(ICC_AP0R1, ICC_AP0R1_EL1)
CPUIF_MAP(ICC_AP0R2, ICC_AP0R2_EL1)
CPUIF_MAP(ICC_AP0R3, ICC_AP0R3_EL1)
CPUIF_MAP(ICC_AP1R0, ICC_AP1R0_EL1)
CPUIF_MAP(ICC_AP1R1, ICC_AP1R1_EL1)
CPUIF_MAP(ICC_AP1R2, ICC_AP1R2_EL1)
CPUIF_MAP(ICC_AP1R3, ICC_AP1R3_EL1)

#define read_gicreg(r)                 read_##r()
#define write_gicreg(v, r)             write_##r(v)

/* Low-level accessors */

static inline void gic_write_eoir(u32 irq)
{
        write_sysreg(irq, ICC_EOIR1);
        isb();
}

static inline void gic_write_dir(u32 val)
{
        write_sysreg(val, ICC_DIR);
        isb();
}

static inline u32 gic_read_iar(void)
{
        u32 irqstat = read_sysreg(ICC_IAR1);

        dsb(sy);

        return irqstat;
}

static inline void gic_write_ctlr(u32 val)
{
        write_sysreg(val, ICC_CTLR);
        isb();
}

static inline u32 gic_read_ctlr(void)
{
        return read_sysreg(ICC_CTLR);
}

static inline void gic_write_grpen1(u32 val)
{
        write_sysreg(val, ICC_IGRPEN1);
        isb();
}

static inline void gic_write_sgi1r(u64 val)
{
        write_sysreg(val, ICC_SGI1R);
}

static inline u32 gic_read_sre(void)
{
        return read_sysreg(ICC_SRE);
}

static inline void gic_write_sre(u32 val)
{
        write_sysreg(val, ICC_SRE);
        isb();
}

static inline void gic_write_bpr1(u32 val)
{
        write_sysreg(val, ICC_BPR1);
}

static inline u32 gic_read_pmr(void)
{
        return read_sysreg(ICC_PMR);
}

static inline void gic_write_pmr(u32 val)
{
        write_sysreg(val, ICC_PMR);
}

static inline u32 gic_read_rpr(void)
{
        return read_sysreg(ICC_RPR);
}

/*
 * Even in 32bit systems that use LPAE, there is no guarantee that the I/O
 * interface provides true 64bit atomic accesses, so using strd/ldrd doesn't
 * make much sense.
 * Moreover, 64bit I/O emulation is extremely difficult to implement on
 * AArch32, since the syndrome register doesn't provide any information for
 * them.
 * Consequently, the following IO helpers use 32bit accesses.
 */
static inline void __gic_writeq_nonatomic(u64 val, volatile void __iomem *addr)
{
        writel_relaxed((u32)val, addr);
        writel_relaxed((u32)(val >> 32), addr + 4);
}

static inline u64 __gic_readq_nonatomic(const volatile void __iomem *addr)
{
        u64 val;

        val = readl_relaxed(addr);
        val |= (u64)readl_relaxed(addr + 4) << 32;
        return val;
}

#define gic_flush_dcache_to_poc(a,l)    __cpuc_flush_dcache_area((a), (l))

/*
 *  GICD_IROUTERn, contain the affinity values associated to each interrupt.
 *  The upper-word (aff3) will always be 0, so there is no need for a lock.
 */
#define gic_write_irouter(v, c)         __gic_writeq_nonatomic(v, c)

/*
 * GICR_TYPER is an ID register and doesn't need atomicity.
 */
#define gic_read_typer(c)               __gic_readq_nonatomic(c)

/*
 * GITS_BASER - hi and lo bits may be accessed independently.
 */
#define gits_read_baser(c)              __gic_readq_nonatomic(c)
#define gits_write_baser(v, c)          __gic_writeq_nonatomic(v, c)

/*
 * GICR_PENDBASER and GICR_PROPBASE are changed with LPIs disabled, so they
 * won't be being used during any updates and can be changed non-atomically
 */
#define gicr_read_propbaser(c)          __gic_readq_nonatomic(c)
#define gicr_write_propbaser(v, c)      __gic_writeq_nonatomic(v, c)
#define gicr_read_pendbaser(c)          __gic_readq_nonatomic(c)
#define gicr_write_pendbaser(v, c)      __gic_writeq_nonatomic(v, c)

/*
 * GICR_xLPIR - only the lower bits are significant
 */
#define gic_read_lpir(c)                readl_relaxed(c)
#define gic_write_lpir(v, c)            writel_relaxed(lower_32_bits(v), c)

/*
 * GITS_TYPER is an ID register and doesn't need atomicity.
 */
#define gits_read_typer(c)              __gic_readq_nonatomic(c)

/*
 * GITS_CBASER - hi and lo bits may be accessed independently.
 */
#define gits_read_cbaser(c)             __gic_readq_nonatomic(c)
#define gits_write_cbaser(v, c)         __gic_writeq_nonatomic(v, c)

/*
 * GITS_CWRITER - hi and lo bits may be accessed independently.
 */
#define gits_write_cwriter(v, c)        __gic_writeq_nonatomic(v, c)

/*
 * GICR_VPROPBASER - hi and lo bits may be accessed independently.
 */
#define gicr_read_vpropbaser(c)         __gic_readq_nonatomic(c)
#define gicr_write_vpropbaser(v, c)     __gic_writeq_nonatomic(v, c)

/*
 * GICR_VPENDBASER - the Valid bit must be cleared before changing
 * anything else.
 */
static inline void gicr_write_vpendbaser(u64 val, void __iomem *addr)
{
        u32 tmp;

        tmp = readl_relaxed(addr + 4);
        if (tmp & (GICR_VPENDBASER_Valid >> 32)) {
                tmp &= ~(GICR_VPENDBASER_Valid >> 32);
                writel_relaxed(tmp, addr + 4);
        }

        /*
         * Use the fact that __gic_writeq_nonatomic writes the second
         * half of the 64bit quantity after the first.
         */
        __gic_writeq_nonatomic(val, addr);
}

#define gicr_read_vpendbaser(c)         __gic_readq_nonatomic(c)

static inline bool gic_prio_masking_enabled(void)
{
        return false;
}

static inline void gic_pmr_mask_irqs(void)
{
        /* Should not get called. */
        WARN_ON_ONCE(true);
}

static inline void gic_arch_enable_irqs(void)
{
        /* Should not get called. */
        WARN_ON_ONCE(true);
}

#endif /* !__ASSEMBLY__ */
#endif /* !__ASM_ARCH_GICV3_H */