1 /*
2  * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
3  * Copyright (C) 2007-2009 PetaLogix
4  * Copyright (C) 2007 John Williams <john.williams@petalogix.com>
5  *
6  * This file is subject to the terms and conditions of the GNU General Public
7  * License. See the file "COPYING" in the main directory of this archive
8  * for more details.
9  */
10 
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/string.h>
14 #include <asm/cpuinfo.h>
15 #include <asm/pvr.h>
16 
17 static const char family_string[] = CONFIG_XILINX_MICROBLAZE0_FAMILY;
18 static const char cpu_ver_string[] = CONFIG_XILINX_MICROBLAZE0_HW_VER;
19 
20 #define err_printk(x) \
21 	early_printk("ERROR: Microblaze " x "-different for kernel and DTS\n");
22 
23 void __init set_cpuinfo_static(struct cpuinfo *ci, struct device_node *cpu)
24 {
25 	int i = 0;
26 
27 	ci->use_instr =
28 		(fcpu(cpu, "xlnx,use-barrel") ? PVR0_USE_BARREL_MASK : 0) |
29 		(fcpu(cpu, "xlnx,use-msr-instr") ? PVR2_USE_MSR_INSTR : 0) |
30 		(fcpu(cpu, "xlnx,use-pcmp-instr") ? PVR2_USE_PCMP_INSTR : 0) |
31 		(fcpu(cpu, "xlnx,use-div") ? PVR0_USE_DIV_MASK : 0);
32 	if (CONFIG_XILINX_MICROBLAZE0_USE_BARREL)
33 		i |= PVR0_USE_BARREL_MASK;
34 	if (CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR)
35 		i |= PVR2_USE_MSR_INSTR;
36 	if (CONFIG_XILINX_MICROBLAZE0_USE_PCMP_INSTR)
37 		i |= PVR2_USE_PCMP_INSTR;
38 	if (CONFIG_XILINX_MICROBLAZE0_USE_DIV)
39 		i |= PVR0_USE_DIV_MASK;
40 	if (ci->use_instr != i)
41 		err_printk("BARREL, MSR, PCMP or DIV");
42 
43 	ci->use_mult = fcpu(cpu, "xlnx,use-hw-mul");
44 	if (ci->use_mult != CONFIG_XILINX_MICROBLAZE0_USE_HW_MUL)
45 		err_printk("HW_MUL");
46 	ci->use_mult =
47 		(ci->use_mult > 1 ?
48 				(PVR2_USE_MUL64_MASK | PVR0_USE_HW_MUL_MASK) :
49 				(ci->use_mult == 1 ? PVR0_USE_HW_MUL_MASK : 0));
50 
51 	ci->use_fpu = fcpu(cpu, "xlnx,use-fpu");
52 	if (ci->use_fpu != CONFIG_XILINX_MICROBLAZE0_USE_FPU)
53 		err_printk("HW_FPU");
54 	ci->use_fpu = (ci->use_fpu > 1 ?
55 				(PVR2_USE_FPU2_MASK | PVR0_USE_FPU_MASK) :
56 				(ci->use_fpu == 1 ? PVR0_USE_FPU_MASK : 0));
57 
58 	ci->use_exc =
59 		(fcpu(cpu, "xlnx,unaligned-exceptions") ?
60 				PVR2_UNALIGNED_EXC_MASK : 0) |
61 		(fcpu(cpu, "xlnx,ill-opcode-exception") ?
62 				PVR2_ILL_OPCODE_EXC_MASK : 0) |
63 		(fcpu(cpu, "xlnx,iopb-bus-exception") ?
64 				PVR2_IOPB_BUS_EXC_MASK : 0) |
65 		(fcpu(cpu, "xlnx,dopb-bus-exception") ?
66 				PVR2_DOPB_BUS_EXC_MASK : 0) |
67 		(fcpu(cpu, "xlnx,div-zero-exception") ?
68 				PVR2_DIV_ZERO_EXC_MASK : 0) |
69 		(fcpu(cpu, "xlnx,fpu-exception") ? PVR2_FPU_EXC_MASK : 0) |
70 		(fcpu(cpu, "xlnx,fsl-exception") ? PVR2_USE_EXTEND_FSL : 0);
71 
72 	ci->use_icache = fcpu(cpu, "xlnx,use-icache");
73 	ci->icache_tagbits = fcpu(cpu, "xlnx,addr-tag-bits");
74 	ci->icache_write = fcpu(cpu, "xlnx,allow-icache-wr");
75 	ci->icache_line_length = fcpu(cpu, "xlnx,icache-line-len") << 2;
76 	if (!ci->icache_line_length) {
77 		if (fcpu(cpu, "xlnx,icache-use-fsl"))
78 			ci->icache_line_length = 4 << 2;
79 		else
80 			ci->icache_line_length = 1 << 2;
81 	}
82 	ci->icache_size = fcpu(cpu, "i-cache-size");
83 	ci->icache_base = fcpu(cpu, "i-cache-baseaddr");
84 	ci->icache_high = fcpu(cpu, "i-cache-highaddr");
85 
86 	ci->use_dcache = fcpu(cpu, "xlnx,use-dcache");
87 	ci->dcache_tagbits = fcpu(cpu, "xlnx,dcache-addr-tag");
88 	ci->dcache_write = fcpu(cpu, "xlnx,allow-dcache-wr");
89 	ci->dcache_line_length = fcpu(cpu, "xlnx,dcache-line-len") << 2;
90 	if (!ci->dcache_line_length) {
91 		if (fcpu(cpu, "xlnx,dcache-use-fsl"))
92 			ci->dcache_line_length = 4 << 2;
93 		else
94 			ci->dcache_line_length = 1 << 2;
95 	}
96 	ci->dcache_size = fcpu(cpu, "d-cache-size");
97 	ci->dcache_base = fcpu(cpu, "d-cache-baseaddr");
98 	ci->dcache_high = fcpu(cpu, "d-cache-highaddr");
99 	ci->dcache_wb = fcpu(cpu, "xlnx,dcache-use-writeback");
100 
101 	ci->use_dopb = fcpu(cpu, "xlnx,d-opb");
102 	ci->use_iopb = fcpu(cpu, "xlnx,i-opb");
103 	ci->use_dlmb = fcpu(cpu, "xlnx,d-lmb");
104 	ci->use_ilmb = fcpu(cpu, "xlnx,i-lmb");
105 
106 	ci->num_fsl = fcpu(cpu, "xlnx,fsl-links");
107 	ci->irq_edge = fcpu(cpu, "xlnx,interrupt-is-edge");
108 	ci->irq_positive = fcpu(cpu, "xlnx,edge-is-positive");
109 	ci->area_optimised = 0;
110 
111 	ci->hw_debug = fcpu(cpu, "xlnx,debug-enabled");
112 	ci->num_pc_brk = fcpu(cpu, "xlnx,number-of-pc-brk");
113 	ci->num_rd_brk = fcpu(cpu, "xlnx,number-of-rd-addr-brk");
114 	ci->num_wr_brk = fcpu(cpu, "xlnx,number-of-wr-addr-brk");
115 
116 	ci->pvr_user1 = fcpu(cpu, "xlnx,pvr-user1");
117 	ci->pvr_user2 = fcpu(cpu, "xlnx,pvr-user2");
118 
119 	ci->mmu = fcpu(cpu, "xlnx,use-mmu");
120 	ci->mmu_privins = fcpu(cpu, "xlnx,mmu-privileged-instr");
121 	ci->endian = fcpu(cpu, "xlnx,endianness");
122 
123 	ci->ver_code = 0;
124 	ci->fpga_family_code = 0;
125 
126 	/* Do various fixups based on CPU version and FPGA family strings */
127 
128 	/* Resolved the CPU version code */
129 	for (i = 0; cpu_ver_lookup[i].s != NULL; i++) {
130 		if (strcmp(cpu_ver_lookup[i].s, cpu_ver_string) == 0)
131 			ci->ver_code = cpu_ver_lookup[i].k;
132 	}
133 
134 	/* Resolved the fpga family code */
135 	for (i = 0; family_string_lookup[i].s != NULL; i++) {
136 		if (strcmp(family_string_lookup[i].s, family_string) == 0)
137 			ci->fpga_family_code = family_string_lookup[i].k;
138 	}
139 
140 	/* FIXME - mb3 and spartan2 do not exist in PVR */
141 	/* This is mb3 and on a non Spartan2 */
142 	if (ci->ver_code == 0x20 && ci->fpga_family_code != 0xf0)
143 		/* Hardware Multiplier in use */
144 		ci->use_mult = 1;
145 }
146