/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_MACH_LOONGSON64_CPUCFG_EMUL_H_
#define _ASM_MACH_LOONGSON64_CPUCFG_EMUL_H_

#include <asm/cpu-info.h>

#ifdef CONFIG_CPU_LOONGSON3_CPUCFG_EMULATION

#include <loongson_regs.h>

#define LOONGSON_FPREV_MASK 0x7

void loongson3_cpucfg_synthesize_data(struct cpuinfo_mips *c);

static inline bool loongson3_cpucfg_emulation_enabled(struct cpuinfo_mips *c)
{
        /* All supported cores have non-zero LOONGSON_CFG1 data. */
        return c->loongson3_cpucfg_data[0] != 0;
}

static inline u32 loongson3_cpucfg_read_synthesized(struct cpuinfo_mips *c,
        __u64 sel)
{
        switch (sel) {
        case LOONGSON_CFG0:
                return c->processor_id;
        case LOONGSON_CFG1:
        case LOONGSON_CFG2:
        case LOONGSON_CFG3:
                return c->loongson3_cpucfg_data[sel - 1];
        case LOONGSON_CFG4:
        case LOONGSON_CFG5:
                /* CPUCFG selects 4 and 5 are related to the input clock
                 * signal.
                 *
                 * Unimplemented for now.
                 */
                return 0;
        case LOONGSON_CFG6:
                /* CPUCFG select 6 is for the undocumented Safe Extension. */
                return 0;
        case LOONGSON_CFG7:
                /* CPUCFG select 7 is for the virtualization extension.
                 * We don't know if the two currently known features are
                 * supported on older cores according to the public
                 * documentation, so leave this at zero.
                 */
                return 0;
        }

        /*
         * Return 0 for unrecognized CPUCFG selects, which is real hardware
         * behavior observed on Loongson 3A R4.
         */
        return 0;
}
#else
static inline void loongson3_cpucfg_synthesize_data(struct cpuinfo_mips *c)
{
}

static inline bool loongson3_cpucfg_emulation_enabled(struct cpuinfo_mips *c)
{
        return false;
}

static inline u32 loongson3_cpucfg_read_synthesized(struct cpuinfo_mips *c,
        __u64 sel)
{
        return 0;
}
#endif

#endif /* _ASM_MACH_LOONGSON64_CPUCFG_EMUL_H_ */