1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * OpenRISC setup.c 4 * 5 * Linux architectural port borrowing liberally from similar works of 6 * others. All original copyrights apply as per the original source 7 * declaration. 8 * 9 * Modifications for the OpenRISC architecture: 10 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com> 11 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se> 12 * 13 * This file handles the architecture-dependent parts of initialization 14 */ 15 16 #include <linux/errno.h> 17 #include <linux/sched.h> 18 #include <linux/kernel.h> 19 #include <linux/mm.h> 20 #include <linux/stddef.h> 21 #include <linux/unistd.h> 22 #include <linux/ptrace.h> 23 #include <linux/slab.h> 24 #include <linux/tty.h> 25 #include <linux/ioport.h> 26 #include <linux/delay.h> 27 #include <linux/console.h> 28 #include <linux/init.h> 29 #include <linux/memblock.h> 30 #include <linux/seq_file.h> 31 #include <linux/serial.h> 32 #include <linux/initrd.h> 33 #include <linux/of_fdt.h> 34 #include <linux/of.h> 35 #include <linux/device.h> 36 37 #include <asm/sections.h> 38 #include <asm/types.h> 39 #include <asm/setup.h> 40 #include <asm/io.h> 41 #include <asm/cpuinfo.h> 42 #include <asm/delay.h> 43 44 #include "vmlinux.h" 45 46 static void __init setup_memory(void) 47 { 48 unsigned long ram_start_pfn; 49 unsigned long ram_end_pfn; 50 phys_addr_t memory_start, memory_end; 51 52 memory_end = memory_start = 0; 53 54 /* Find main memory where is the kernel, we assume its the only one */ 55 memory_start = memblock_start_of_DRAM(); 56 memory_end = memblock_end_of_DRAM(); 57 58 if (!memory_end) { 59 panic("No memory!"); 60 } 61 62 ram_start_pfn = PFN_UP(memory_start); 63 ram_end_pfn = PFN_DOWN(memblock_end_of_DRAM()); 64 65 /* setup bootmem globals (we use no_bootmem, but mm still depends on this) */ 66 min_low_pfn = ram_start_pfn; 67 max_low_pfn = ram_end_pfn; 68 max_pfn = ram_end_pfn; 69 70 /* 71 * initialize the boot-time allocator (with low memory only). 72 * 73 * This makes the memory from the end of the kernel to the end of 74 * RAM usable. 75 */ 76 memblock_reserve(__pa(_stext), _end - _stext); 77 78 #ifdef CONFIG_BLK_DEV_INITRD 79 /* Then reserve the initrd, if any */ 80 if (initrd_start && (initrd_end > initrd_start)) { 81 unsigned long aligned_start = ALIGN_DOWN(initrd_start, PAGE_SIZE); 82 unsigned long aligned_end = ALIGN(initrd_end, PAGE_SIZE); 83 84 memblock_reserve(__pa(aligned_start), aligned_end - aligned_start); 85 } 86 #endif /* CONFIG_BLK_DEV_INITRD */ 87 88 early_init_fdt_reserve_self(); 89 early_init_fdt_scan_reserved_mem(); 90 91 memblock_dump_all(); 92 } 93 94 struct cpuinfo_or1k cpuinfo_or1k[NR_CPUS]; 95 96 static void print_cpuinfo(void) 97 { 98 unsigned long upr = mfspr(SPR_UPR); 99 unsigned long vr = mfspr(SPR_VR); 100 unsigned int version; 101 unsigned int revision; 102 struct cpuinfo_or1k *cpuinfo = &cpuinfo_or1k[smp_processor_id()]; 103 104 version = (vr & SPR_VR_VER) >> 24; 105 revision = (vr & SPR_VR_REV); 106 107 printk(KERN_INFO "CPU: OpenRISC-%x (revision %d) @%d MHz\n", 108 version, revision, cpuinfo->clock_frequency / 1000000); 109 110 if (!(upr & SPR_UPR_UP)) { 111 printk(KERN_INFO 112 "-- no UPR register... unable to detect configuration\n"); 113 return; 114 } 115 116 if (upr & SPR_UPR_DCP) 117 printk(KERN_INFO 118 "-- dcache: %4d bytes total, %2d bytes/line, %d way(s)\n", 119 cpuinfo->dcache_size, cpuinfo->dcache_block_size, 120 cpuinfo->dcache_ways); 121 else 122 printk(KERN_INFO "-- dcache disabled\n"); 123 if (upr & SPR_UPR_ICP) 124 printk(KERN_INFO 125 "-- icache: %4d bytes total, %2d bytes/line, %d way(s)\n", 126 cpuinfo->icache_size, cpuinfo->icache_block_size, 127 cpuinfo->icache_ways); 128 else 129 printk(KERN_INFO "-- icache disabled\n"); 130 131 if (upr & SPR_UPR_DMP) 132 printk(KERN_INFO "-- dmmu: %4d entries, %lu way(s)\n", 133 1 << ((mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTS) >> 2), 134 1 + (mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTW)); 135 if (upr & SPR_UPR_IMP) 136 printk(KERN_INFO "-- immu: %4d entries, %lu way(s)\n", 137 1 << ((mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTS) >> 2), 138 1 + (mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTW)); 139 140 printk(KERN_INFO "-- additional features:\n"); 141 if (upr & SPR_UPR_DUP) 142 printk(KERN_INFO "-- debug unit\n"); 143 if (upr & SPR_UPR_PCUP) 144 printk(KERN_INFO "-- performance counters\n"); 145 if (upr & SPR_UPR_PMP) 146 printk(KERN_INFO "-- power management\n"); 147 if (upr & SPR_UPR_PICP) 148 printk(KERN_INFO "-- PIC\n"); 149 if (upr & SPR_UPR_TTP) 150 printk(KERN_INFO "-- timer\n"); 151 if (upr & SPR_UPR_CUP) 152 printk(KERN_INFO "-- custom unit(s)\n"); 153 } 154 155 static struct device_node *setup_find_cpu_node(int cpu) 156 { 157 u32 hwid; 158 struct device_node *cpun; 159 160 for_each_of_cpu_node(cpun) { 161 if (of_property_read_u32(cpun, "reg", &hwid)) 162 continue; 163 if (hwid == cpu) 164 return cpun; 165 } 166 167 return NULL; 168 } 169 170 void __init setup_cpuinfo(void) 171 { 172 struct device_node *cpu; 173 unsigned long iccfgr, dccfgr; 174 unsigned long cache_set_size; 175 int cpu_id = smp_processor_id(); 176 struct cpuinfo_or1k *cpuinfo = &cpuinfo_or1k[cpu_id]; 177 178 cpu = setup_find_cpu_node(cpu_id); 179 if (!cpu) 180 panic("Couldn't find CPU%d in device tree...\n", cpu_id); 181 182 iccfgr = mfspr(SPR_ICCFGR); 183 cpuinfo->icache_ways = 1 << (iccfgr & SPR_ICCFGR_NCW); 184 cache_set_size = 1 << ((iccfgr & SPR_ICCFGR_NCS) >> 3); 185 cpuinfo->icache_block_size = 16 << ((iccfgr & SPR_ICCFGR_CBS) >> 7); 186 cpuinfo->icache_size = 187 cache_set_size * cpuinfo->icache_ways * cpuinfo->icache_block_size; 188 189 dccfgr = mfspr(SPR_DCCFGR); 190 cpuinfo->dcache_ways = 1 << (dccfgr & SPR_DCCFGR_NCW); 191 cache_set_size = 1 << ((dccfgr & SPR_DCCFGR_NCS) >> 3); 192 cpuinfo->dcache_block_size = 16 << ((dccfgr & SPR_DCCFGR_CBS) >> 7); 193 cpuinfo->dcache_size = 194 cache_set_size * cpuinfo->dcache_ways * cpuinfo->dcache_block_size; 195 196 if (of_property_read_u32(cpu, "clock-frequency", 197 &cpuinfo->clock_frequency)) { 198 printk(KERN_WARNING 199 "Device tree missing CPU 'clock-frequency' parameter." 200 "Assuming frequency 25MHZ" 201 "This is probably not what you want."); 202 } 203 204 cpuinfo->coreid = mfspr(SPR_COREID); 205 206 of_node_put(cpu); 207 208 print_cpuinfo(); 209 } 210 211 /** 212 * or32_early_setup 213 * 214 * Handles the pointer to the device tree that this kernel is to use 215 * for establishing the available platform devices. 216 * 217 * Falls back on built-in device tree in case null pointer is passed. 218 */ 219 220 void __init or32_early_setup(void *fdt) 221 { 222 if (fdt) 223 pr_info("FDT at %p\n", fdt); 224 else { 225 fdt = __dtb_start; 226 pr_info("Compiled-in FDT at %p\n", fdt); 227 } 228 early_init_devtree(fdt); 229 } 230 231 static inline unsigned long extract_value_bits(unsigned long reg, 232 short bit_nr, short width) 233 { 234 return (reg >> bit_nr) & (0 << width); 235 } 236 237 static inline unsigned long extract_value(unsigned long reg, unsigned long mask) 238 { 239 while (!(mask & 0x1)) { 240 reg = reg >> 1; 241 mask = mask >> 1; 242 } 243 return mask & reg; 244 } 245 246 void __init detect_unit_config(unsigned long upr, unsigned long mask, 247 char *text, void (*func) (void)) 248 { 249 if (text != NULL) 250 printk("%s", text); 251 252 if (upr & mask) { 253 if (func != NULL) 254 func(); 255 else 256 printk("present\n"); 257 } else 258 printk("not present\n"); 259 } 260 261 /* 262 * calibrate_delay 263 * 264 * Lightweight calibrate_delay implementation that calculates loops_per_jiffy 265 * from the clock frequency passed in via the device tree 266 * 267 */ 268 269 void calibrate_delay(void) 270 { 271 const int *val; 272 struct device_node *cpu = setup_find_cpu_node(smp_processor_id()); 273 274 val = of_get_property(cpu, "clock-frequency", NULL); 275 if (!val) 276 panic("no cpu 'clock-frequency' parameter in device tree"); 277 loops_per_jiffy = *val / HZ; 278 pr_cont("%lu.%02lu BogoMIPS (lpj=%lu)\n", 279 loops_per_jiffy / (500000 / HZ), 280 (loops_per_jiffy / (5000 / HZ)) % 100, loops_per_jiffy); 281 } 282 283 void __init setup_arch(char **cmdline_p) 284 { 285 unflatten_and_copy_device_tree(); 286 287 setup_cpuinfo(); 288 289 #ifdef CONFIG_SMP 290 smp_init_cpus(); 291 #endif 292 293 /* process 1's initial memory region is the kernel code/data */ 294 init_mm.start_code = (unsigned long)_stext; 295 init_mm.end_code = (unsigned long)_etext; 296 init_mm.end_data = (unsigned long)_edata; 297 init_mm.brk = (unsigned long)_end; 298 299 #ifdef CONFIG_BLK_DEV_INITRD 300 if (initrd_start == initrd_end) { 301 printk(KERN_INFO "Initial ramdisk not found\n"); 302 initrd_start = 0; 303 initrd_end = 0; 304 } else { 305 printk(KERN_INFO "Initial ramdisk at: 0x%p (%lu bytes)\n", 306 (void *)(initrd_start), initrd_end - initrd_start); 307 initrd_below_start_ok = 1; 308 } 309 #endif 310 311 /* setup memblock allocator */ 312 setup_memory(); 313 314 /* paging_init() sets up the MMU and marks all pages as reserved */ 315 paging_init(); 316 317 *cmdline_p = boot_command_line; 318 319 printk(KERN_INFO "OpenRISC Linux -- http://openrisc.io\n"); 320 } 321 322 static int show_cpuinfo(struct seq_file *m, void *v) 323 { 324 unsigned int vr, cpucfgr; 325 unsigned int avr; 326 unsigned int version; 327 struct cpuinfo_or1k *cpuinfo = v; 328 329 vr = mfspr(SPR_VR); 330 cpucfgr = mfspr(SPR_CPUCFGR); 331 332 #ifdef CONFIG_SMP 333 seq_printf(m, "processor\t\t: %d\n", cpuinfo->coreid); 334 #endif 335 if (vr & SPR_VR_UVRP) { 336 vr = mfspr(SPR_VR2); 337 version = vr & SPR_VR2_VER; 338 avr = mfspr(SPR_AVR); 339 seq_printf(m, "cpu architecture\t: " 340 "OpenRISC 1000 (%d.%d-rev%d)\n", 341 (avr >> 24) & 0xff, 342 (avr >> 16) & 0xff, 343 (avr >> 8) & 0xff); 344 seq_printf(m, "cpu implementation id\t: 0x%x\n", 345 (vr & SPR_VR2_CPUID) >> 24); 346 seq_printf(m, "cpu version\t\t: 0x%x\n", version); 347 } else { 348 version = (vr & SPR_VR_VER) >> 24; 349 seq_printf(m, "cpu\t\t\t: OpenRISC-%x\n", version); 350 seq_printf(m, "revision\t\t: %d\n", vr & SPR_VR_REV); 351 } 352 seq_printf(m, "frequency\t\t: %ld\n", loops_per_jiffy * HZ); 353 seq_printf(m, "dcache size\t\t: %d bytes\n", cpuinfo->dcache_size); 354 seq_printf(m, "dcache block size\t: %d bytes\n", 355 cpuinfo->dcache_block_size); 356 seq_printf(m, "dcache ways\t\t: %d\n", cpuinfo->dcache_ways); 357 seq_printf(m, "icache size\t\t: %d bytes\n", cpuinfo->icache_size); 358 seq_printf(m, "icache block size\t: %d bytes\n", 359 cpuinfo->icache_block_size); 360 seq_printf(m, "icache ways\t\t: %d\n", cpuinfo->icache_ways); 361 seq_printf(m, "immu\t\t\t: %d entries, %lu ways\n", 362 1 << ((mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTS) >> 2), 363 1 + (mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTW)); 364 seq_printf(m, "dmmu\t\t\t: %d entries, %lu ways\n", 365 1 << ((mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTS) >> 2), 366 1 + (mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTW)); 367 seq_printf(m, "bogomips\t\t: %lu.%02lu\n", 368 (loops_per_jiffy * HZ) / 500000, 369 ((loops_per_jiffy * HZ) / 5000) % 100); 370 371 seq_puts(m, "features\t\t: "); 372 seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OB32S ? "orbis32" : ""); 373 seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OB64S ? "orbis64" : ""); 374 seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OF32S ? "orfpx32" : ""); 375 seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OF64S ? "orfpx64" : ""); 376 seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OV64S ? "orvdx64" : ""); 377 seq_puts(m, "\n"); 378 379 seq_puts(m, "\n"); 380 381 return 0; 382 } 383 384 static void *c_start(struct seq_file *m, loff_t *pos) 385 { 386 *pos = cpumask_next(*pos - 1, cpu_online_mask); 387 if ((*pos) < nr_cpu_ids) 388 return &cpuinfo_or1k[*pos]; 389 return NULL; 390 } 391 392 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 393 { 394 (*pos)++; 395 return c_start(m, pos); 396 } 397 398 static void c_stop(struct seq_file *m, void *v) 399 { 400 } 401 402 const struct seq_operations cpuinfo_op = { 403 .start = c_start, 404 .next = c_next, 405 .stop = c_stop, 406 .show = show_cpuinfo, 407 }; 408