1 /* 2 * arch/sh/kernel/cpu/sh4/probe.c 3 * 4 * CPU Subtype Probing for SH-4. 5 * 6 * Copyright (C) 2001 - 2007 Paul Mundt 7 * Copyright (C) 2003 Richard Curnow 8 * 9 * This file is subject to the terms and conditions of the GNU General Public 10 * License. See the file "COPYING" in the main directory of this archive 11 * for more details. 12 */ 13 #include <linux/init.h> 14 #include <linux/io.h> 15 #include <asm/processor.h> 16 #include <asm/cache.h> 17 18 int __init detect_cpu_and_cache_system(void) 19 { 20 unsigned long pvr, prr, cvr; 21 unsigned long size; 22 23 static unsigned long sizes[16] = { 24 [1] = (1 << 12), 25 [2] = (1 << 13), 26 [4] = (1 << 14), 27 [8] = (1 << 15), 28 [9] = (1 << 16) 29 }; 30 31 pvr = (ctrl_inl(CCN_PVR) >> 8) & 0xffffff; 32 prr = (ctrl_inl(CCN_PRR) >> 4) & 0xff; 33 cvr = (ctrl_inl(CCN_CVR)); 34 35 /* 36 * Setup some sane SH-4 defaults for the icache 37 */ 38 boot_cpu_data.icache.way_incr = (1 << 13); 39 boot_cpu_data.icache.entry_shift = 5; 40 boot_cpu_data.icache.sets = 256; 41 boot_cpu_data.icache.ways = 1; 42 boot_cpu_data.icache.linesz = L1_CACHE_BYTES; 43 44 /* 45 * And again for the dcache .. 46 */ 47 boot_cpu_data.dcache.way_incr = (1 << 14); 48 boot_cpu_data.dcache.entry_shift = 5; 49 boot_cpu_data.dcache.sets = 512; 50 boot_cpu_data.dcache.ways = 1; 51 boot_cpu_data.dcache.linesz = L1_CACHE_BYTES; 52 53 /* 54 * Setup some generic flags we can probe on SH-4A parts 55 */ 56 if (((pvr >> 16) & 0xff) == 0x10) { 57 if ((cvr & 0x10000000) == 0) 58 boot_cpu_data.flags |= CPU_HAS_DSP; 59 60 boot_cpu_data.flags |= CPU_HAS_LLSC; 61 } 62 63 /* FPU detection works for everyone */ 64 if ((cvr & 0x20000000) == 1) 65 boot_cpu_data.flags |= CPU_HAS_FPU; 66 67 /* Mask off the upper chip ID */ 68 pvr &= 0xffff; 69 70 /* 71 * Probe the underlying processor version/revision and 72 * adjust cpu_data setup accordingly. 73 */ 74 switch (pvr) { 75 case 0x205: 76 boot_cpu_data.type = CPU_SH7750; 77 boot_cpu_data.flags |= CPU_HAS_P2_FLUSH_BUG | CPU_HAS_FPU | 78 CPU_HAS_PERF_COUNTER; 79 break; 80 case 0x206: 81 boot_cpu_data.type = CPU_SH7750S; 82 boot_cpu_data.flags |= CPU_HAS_P2_FLUSH_BUG | CPU_HAS_FPU | 83 CPU_HAS_PERF_COUNTER; 84 break; 85 case 0x1100: 86 boot_cpu_data.type = CPU_SH7751; 87 boot_cpu_data.flags |= CPU_HAS_FPU; 88 break; 89 case 0x2001: 90 case 0x2004: 91 boot_cpu_data.type = CPU_SH7770; 92 boot_cpu_data.icache.ways = 4; 93 boot_cpu_data.dcache.ways = 4; 94 95 boot_cpu_data.flags |= CPU_HAS_FPU | CPU_HAS_LLSC; 96 break; 97 case 0x2006: 98 case 0x200A: 99 if (prr == 0x61) 100 boot_cpu_data.type = CPU_SH7781; 101 else if (prr == 0xa1) 102 boot_cpu_data.type = CPU_SH7763; 103 else 104 boot_cpu_data.type = CPU_SH7780; 105 106 boot_cpu_data.icache.ways = 4; 107 boot_cpu_data.dcache.ways = 4; 108 109 boot_cpu_data.flags |= CPU_HAS_FPU | CPU_HAS_PERF_COUNTER | 110 CPU_HAS_LLSC; 111 break; 112 case 0x3000: 113 case 0x3003: 114 case 0x3009: 115 boot_cpu_data.type = CPU_SH7343; 116 boot_cpu_data.icache.ways = 4; 117 boot_cpu_data.dcache.ways = 4; 118 boot_cpu_data.flags |= CPU_HAS_LLSC; 119 break; 120 case 0x3004: 121 case 0x3007: 122 boot_cpu_data.type = CPU_SH7785; 123 boot_cpu_data.icache.ways = 4; 124 boot_cpu_data.dcache.ways = 4; 125 boot_cpu_data.flags |= CPU_HAS_FPU | CPU_HAS_PERF_COUNTER | 126 CPU_HAS_LLSC; 127 break; 128 case 0x3008: 129 if (prr == 0xa0 || prr == 0xa1) { 130 boot_cpu_data.type = CPU_SH7722; 131 boot_cpu_data.icache.ways = 4; 132 boot_cpu_data.dcache.ways = 4; 133 boot_cpu_data.flags |= CPU_HAS_LLSC; 134 } 135 else if (prr == 0x70) { 136 boot_cpu_data.type = CPU_SH7366; 137 boot_cpu_data.icache.ways = 4; 138 boot_cpu_data.dcache.ways = 4; 139 boot_cpu_data.flags |= CPU_HAS_LLSC; 140 } 141 break; 142 case 0x4000: /* 1st cut */ 143 case 0x4001: /* 2nd cut */ 144 boot_cpu_data.type = CPU_SHX3; 145 boot_cpu_data.icache.ways = 4; 146 boot_cpu_data.dcache.ways = 4; 147 boot_cpu_data.flags |= CPU_HAS_FPU | CPU_HAS_PERF_COUNTER | 148 CPU_HAS_LLSC; 149 break; 150 case 0x700: 151 boot_cpu_data.type = CPU_SH4_501; 152 boot_cpu_data.icache.ways = 2; 153 boot_cpu_data.dcache.ways = 2; 154 break; 155 case 0x600: 156 boot_cpu_data.type = CPU_SH4_202; 157 boot_cpu_data.icache.ways = 2; 158 boot_cpu_data.dcache.ways = 2; 159 boot_cpu_data.flags |= CPU_HAS_FPU; 160 break; 161 case 0x500 ... 0x501: 162 switch (prr) { 163 case 0x10: 164 boot_cpu_data.type = CPU_SH7750R; 165 break; 166 case 0x11: 167 boot_cpu_data.type = CPU_SH7751R; 168 break; 169 case 0x50 ... 0x5f: 170 boot_cpu_data.type = CPU_SH7760; 171 break; 172 } 173 174 boot_cpu_data.icache.ways = 2; 175 boot_cpu_data.dcache.ways = 2; 176 177 boot_cpu_data.flags |= CPU_HAS_FPU; 178 179 break; 180 default: 181 boot_cpu_data.type = CPU_SH_NONE; 182 break; 183 } 184 185 #ifdef CONFIG_SH_DIRECT_MAPPED 186 boot_cpu_data.icache.ways = 1; 187 boot_cpu_data.dcache.ways = 1; 188 #endif 189 190 #ifdef CONFIG_CPU_HAS_PTEA 191 boot_cpu_data.flags |= CPU_HAS_PTEA; 192 #endif 193 194 /* 195 * On anything that's not a direct-mapped cache, look to the CVR 196 * for I/D-cache specifics. 197 */ 198 if (boot_cpu_data.icache.ways > 1) { 199 size = sizes[(cvr >> 20) & 0xf]; 200 boot_cpu_data.icache.way_incr = (size >> 1); 201 boot_cpu_data.icache.sets = (size >> 6); 202 203 } 204 205 /* And the rest of the D-cache */ 206 if (boot_cpu_data.dcache.ways > 1) { 207 size = sizes[(cvr >> 16) & 0xf]; 208 boot_cpu_data.dcache.way_incr = (size >> 1); 209 boot_cpu_data.dcache.sets = (size >> 6); 210 } 211 212 /* 213 * Setup the L2 cache desc 214 * 215 * SH-4A's have an optional PIPT L2. 216 */ 217 if (boot_cpu_data.flags & CPU_HAS_L2_CACHE) { 218 /* 219 * Size calculation is much more sensible 220 * than it is for the L1. 221 * 222 * Sizes are 128KB, 258KB, 512KB, and 1MB. 223 */ 224 size = (cvr & 0xf) << 17; 225 226 BUG_ON(!size); 227 228 boot_cpu_data.scache.way_incr = (1 << 16); 229 boot_cpu_data.scache.entry_shift = 5; 230 boot_cpu_data.scache.ways = 4; 231 boot_cpu_data.scache.linesz = L1_CACHE_BYTES; 232 233 boot_cpu_data.scache.entry_mask = 234 (boot_cpu_data.scache.way_incr - 235 boot_cpu_data.scache.linesz); 236 237 boot_cpu_data.scache.sets = size / 238 (boot_cpu_data.scache.linesz * 239 boot_cpu_data.scache.ways); 240 241 boot_cpu_data.scache.way_size = 242 (boot_cpu_data.scache.sets * 243 boot_cpu_data.scache.linesz); 244 } 245 246 return 0; 247 } 248