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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2023 Loongson Technology Corporation Limited
*/
#include "lsdc_drv.h"
#include "lsdc_probe.h"
/*
* Processor ID (implementation) values for bits 15:8 of the PRID register.
*/
#define LOONGSON_CPU_IMP_MASK 0xff00
#define LOONGSON_CPU_IMP_SHIFT 8
#define LOONGARCH_CPU_IMP_LS2K1000 0xa0
#define LOONGARCH_CPU_IMP_LS2K2000 0xb0
#define LOONGARCH_CPU_IMP_LS3A5000 0xc0
#define LOONGSON_CPU_MIPS_IMP_LS2K 0x61 /* Loongson 2K Mips series SoC */
/*
* Particular Revision values for bits 7:0 of the PRID register.
*/
#define LOONGSON_CPU_REV_MASK 0x00ff
#define LOONGARCH_CPUCFG_PRID_REG 0x0
/*
* We can achieve fine-grained control with the information about the host.
*/
unsigned int loongson_cpu_get_prid(u8 *imp, u8 *rev)
{
unsigned int prid = 0;
#if defined(__loongarch__)
__asm__ volatile("cpucfg %0, %1\n\t"
: "=&r"(prid)
: "r"(LOONGARCH_CPUCFG_PRID_REG)
);
#endif
#if defined(__mips__)
__asm__ volatile("mfc0\t%0, $15\n\t"
: "=r" (prid)
);
#endif
if (imp)
*imp = (prid & LOONGSON_CPU_IMP_MASK) >> LOONGSON_CPU_IMP_SHIFT;
if (rev)
*rev = prid & LOONGSON_CPU_REV_MASK;
return prid;
}
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