summaryrefslogtreecommitdiff
path: root/arch/openrisc/cpu/cpu.c
blob: f238fe4c60dd42eb898d71756bf4d23546d9afe9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
/*
 * (C) Copyright 2011, Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
 * (C) Copyright 2011, Julius Baxter <julius@opencores.org>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <asm/system.h>
#include <asm/openrisc_exc.h>

static volatile int illegal_instruction;

static void illegal_instruction_handler(void)
{
	ulong *epcr = (ulong *)mfspr(SPR_EPCR_BASE);

	/* skip over the illegal instruction */
	mtspr(SPR_EPCR_BASE, (ulong)(++epcr));
	illegal_instruction = 1;
}

static void checkinstructions(void)
{
	ulong ra = 1, rb = 1, rc;

	exception_install_handler(EXC_ILLEGAL_INSTR,
				illegal_instruction_handler);

	illegal_instruction = 0;
	asm volatile("l.mul %0,%1,%2" : "=r" (rc) : "r" (ra), "r" (rb));
	printf("           Hardware multiplier: %s\n",
		illegal_instruction ? "no" : "yes");

	illegal_instruction = 0;
	asm volatile("l.div %0,%1,%2" : "=r" (rc) : "r" (ra), "r" (rb));
	printf("           Hardware divider: %s\n",
		illegal_instruction ? "no" : "yes");

	exception_free_handler(EXC_ILLEGAL_INSTR);
}

int checkcpu(void)
{
	ulong upr = mfspr(SPR_UPR);
	ulong vr = mfspr(SPR_VR);
	ulong iccfgr = mfspr(SPR_ICCFGR);
	ulong dccfgr = mfspr(SPR_DCCFGR);
	ulong immucfgr = mfspr(SPR_IMMUCFGR);
	ulong dmmucfgr = mfspr(SPR_DMMUCFGR);
	ulong cpucfgr = mfspr(SPR_CPUCFGR);
	uint ver = (vr & SPR_VR_VER) >> 24;
	uint rev = vr & SPR_VR_REV;
	uint block_size;
	uint ways;
	uint sets;

	printf("CPU:   OpenRISC-%x00 (rev %d) @ %d MHz\n",
		ver, rev, (CONFIG_SYS_CLK_FREQ / 1000000));

	if (upr & SPR_UPR_DCP) {
		block_size = (dccfgr & SPR_DCCFGR_CBS) ? 32 : 16;
		ways = 1 << (dccfgr & SPR_DCCFGR_NCW);
		printf("       D-Cache: %d bytes, %d bytes/line, %d way(s)\n",
		       checkdcache(), block_size, ways);
	} else {
		printf("       D-Cache: no\n");
	}

	if (upr & SPR_UPR_ICP) {
		block_size = (iccfgr & SPR_ICCFGR_CBS) ? 32 : 16;
		ways = 1 << (iccfgr & SPR_ICCFGR_NCW);
		printf("       I-Cache: %d bytes, %d bytes/line, %d way(s)\n",
		       checkicache(), block_size, ways);
	} else {
		printf("       I-Cache: no\n");
	}

	if (upr & SPR_UPR_DMP) {
		sets = 1 << ((dmmucfgr & SPR_DMMUCFGR_NTS) >> 2);
		ways = (dmmucfgr & SPR_DMMUCFGR_NTW) + 1;
		printf("       DMMU: %d sets, %d way(s)\n",
		       sets, ways);
	} else {
		printf("       DMMU: no\n");
	}

	if (upr & SPR_UPR_IMP) {
		sets = 1 << ((immucfgr & SPR_IMMUCFGR_NTS) >> 2);
		ways = (immucfgr & SPR_IMMUCFGR_NTW) + 1;
		printf("       IMMU: %d sets, %d way(s)\n",
		       sets, ways);
	} else {
		printf("       IMMU: no\n");
	}

	printf("       MAC unit: %s\n",
		(upr & SPR_UPR_MP) ? "yes" : "no");
	printf("       Debug unit: %s\n",
		(upr & SPR_UPR_DUP) ? "yes" : "no");
	printf("       Performance counters: %s\n",
		(upr & SPR_UPR_PCUP) ? "yes" : "no");
	printf("       Power management: %s\n",
		(upr & SPR_UPR_PMP) ? "yes" : "no");
	printf("       Interrupt controller: %s\n",
		(upr & SPR_UPR_PICP) ? "yes" : "no");
	printf("       Timer: %s\n",
		(upr & SPR_UPR_TTP) ? "yes" : "no");
	printf("       Custom unit(s): %s\n",
		(upr & SPR_UPR_CUP) ? "yes" : "no");

	printf("       Supported instructions:\n");
	printf("           ORBIS32: %s\n",
		(cpucfgr & SPR_CPUCFGR_OB32S) ? "yes" : "no");
	printf("           ORBIS64: %s\n",
		(cpucfgr & SPR_CPUCFGR_OB64S) ? "yes" : "no");
	printf("           ORFPX32: %s\n",
		(cpucfgr & SPR_CPUCFGR_OF32S) ? "yes" : "no");
	printf("           ORFPX64: %s\n",
		(cpucfgr & SPR_CPUCFGR_OF64S) ? "yes" : "no");

	checkinstructions();

	return 0;
}

int cleanup_before_linux(void)
{
	disable_interrupts();
	return 0;
}

extern void __reset(void);

int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
	disable_interrupts();
	/* Code the jump to __reset here as the compiler is prone to
	   emitting a bad jump instruction if the function is in flash */
	__asm__("l.movhi r1,hi(__reset);  \
                 l.ori r1,r1,lo(__reset); \
                 l.jr r1");
	/* not reached, __reset does not return */
	return 0;
}