1 // SPDX-License-Identifier: GPL-2.0-or-later
6  * Copyright (C) 1994 - 2006 Ralf Baechle
18 #include <asm/cpu.h>
19 #include <asm/cpu-features.h>
20 #include <asm/cpu-type.h>
26 #include "fpu-probe.h"
38  * Probe whether cpu has config register by trying to play with
46 	unsigned long cfg = read_c0_conf();  in cpu_has_confreg()  local
49 	write_c0_conf(cfg ^ R30XX_CONF_AC);  in cpu_has_confreg()
51 	write_c0_conf(cfg);  in cpu_has_confreg()
58 static inline void set_elf_platform(int cpu, const char *plat)  in set_elf_platform()  argument
60 	if (cpu == 0)  in set_elf_platform()
71 	unsigned int cpu = smp_processor_id();  in cpu_probe()  local
74 	 * Set a default elf platform, cpu probe may later  in cpu_probe()
77 	set_elf_platform(cpu, "mips");  in cpu_probe()
79 	c->processor_id = PRID_IMP_UNKNOWN;  in cpu_probe()
80 	c->fpu_id	= FPIR_IMP_NONE;  in cpu_probe()
81 	c->cputype	= CPU_UNKNOWN;  in cpu_probe()
82 	c->writecombine = _CACHE_UNCACHED;  in cpu_probe()
84 	c->fpu_csr31	= FPU_CSR_RN;  in cpu_probe()
85 	c->fpu_msk31	= FPU_CSR_RSVD | FPU_CSR_ABS2008 | FPU_CSR_NAN2008 |  in cpu_probe()
88 	c->srsets = 1;  in cpu_probe()
90 	c->processor_id = read_c0_prid();  in cpu_probe()
91 	switch (c->processor_id & (PRID_COMP_MASK | PRID_IMP_MASK)) {  in cpu_probe()
93 		c->cputype = CPU_R2000;  in cpu_probe()
94 		__cpu_name[cpu] = "R2000";  in cpu_probe()
95 		c->options = MIPS_CPU_TLB | MIPS_CPU_3K_CACHE |  in cpu_probe()
98 			c->options |= MIPS_CPU_FPU;  in cpu_probe()
99 		c->tlbsize = 64;  in cpu_probe()
102 		if ((c->processor_id & PRID_REV_MASK) == PRID_REV_R3000A) {  in cpu_probe()
104 				c->cputype = CPU_R3081E;  in cpu_probe()
105 				__cpu_name[cpu] = "R3081";  in cpu_probe()
107 				c->cputype = CPU_R3000A;  in cpu_probe()
108 				__cpu_name[cpu] = "R3000A";  in cpu_probe()
111 			c->cputype = CPU_R3000;  in cpu_probe()
112 			__cpu_name[cpu] = "R3000";  in cpu_probe()
114 		c->options = MIPS_CPU_TLB | MIPS_CPU_3K_CACHE |  in cpu_probe()
117 			c->options |= MIPS_CPU_FPU;  in cpu_probe()
118 		c->tlbsize = 64;  in cpu_probe()
122 	BUG_ON(!__cpu_name[cpu]);  in cpu_probe()
123 	BUG_ON(c->cputype == CPU_UNKNOWN);  in cpu_probe()
126 	 * Platform code can force the cpu type to optimize code  in cpu_probe()
127 	 * generation. In that case be sure the cpu type is correctly  in cpu_probe()
130 	BUG_ON(current_cpu_type() != c->cputype);  in cpu_probe()
133 		c->options &= ~MIPS_CPU_FPU;  in cpu_probe()
135 	if (c->options & MIPS_CPU_FPU)  in cpu_probe()
147 	pr_info("CPU%d revision is: %08x (%s)\n",  in cpu_report()
148 		smp_processor_id(), c->processor_id, cpu_name_string());  in cpu_report()
149 	if (c->options & MIPS_CPU_FPU)  in cpu_report()
150 		pr_info("FPU revision is: %08x\n", c->fpu_id);  in cpu_report()