1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Initial setup-routines for HP 9000 based hardware. 4 * 5 * Copyright (C) 1991, 1992, 1995 Linus Torvalds 6 * Modifications for PA-RISC (C) 1999-2008 Helge Deller <deller@gmx.de> 7 * Modifications copyright 1999 SuSE GmbH (Philipp Rumpf) 8 * Modifications copyright 2000 Martin K. Petersen <mkp@mkp.net> 9 * Modifications copyright 2000 Philipp Rumpf <prumpf@tux.org> 10 * Modifications copyright 2001 Ryan Bradetich <rbradetich@uswest.net> 11 * 12 * Initial PA-RISC Version: 04-23-1999 by Helge Deller 13 */ 14 #include <linux/delay.h> 15 #include <linux/init.h> 16 #include <linux/mm.h> 17 #include <linux/module.h> 18 #include <linux/seq_file.h> 19 #include <linux/random.h> 20 #include <linux/slab.h> 21 #include <linux/cpu.h> 22 #include <asm/param.h> 23 #include <asm/cache.h> 24 #include <asm/hardware.h> /* for register_parisc_driver() stuff */ 25 #include <asm/processor.h> 26 #include <asm/page.h> 27 #include <asm/pdc.h> 28 #include <asm/pdcpat.h> 29 #include <asm/irq.h> /* for struct irq_region */ 30 #include <asm/parisc-device.h> 31 32 struct system_cpuinfo_parisc boot_cpu_data __ro_after_init; 33 EXPORT_SYMBOL(boot_cpu_data); 34 #ifdef CONFIG_PA8X00 35 int _parisc_requires_coherency __ro_after_init; 36 EXPORT_SYMBOL(_parisc_requires_coherency); 37 #endif 38 39 DEFINE_PER_CPU(struct cpuinfo_parisc, cpu_data); 40 41 /* 42 ** PARISC CPU driver - claim "device" and initialize CPU data structures. 43 ** 44 ** Consolidate per CPU initialization into (mostly) one module. 45 ** Monarch CPU will initialize boot_cpu_data which shouldn't 46 ** change once the system has booted. 47 ** 48 ** The callback *should* do per-instance initialization of 49 ** everything including the monarch. "Per CPU" init code in 50 ** setup.c:start_parisc() has migrated here and start_parisc() 51 ** will call register_parisc_driver(&cpu_driver) before calling do_inventory(). 52 ** 53 ** The goal of consolidating CPU initialization into one place is 54 ** to make sure all CPUs get initialized the same way. 55 ** The code path not shared is how PDC hands control of the CPU to the OS. 56 ** The initialization of OS data structures is the same (done below). 57 */ 58 59 /** 60 * init_cpu_profiler - enable/setup per cpu profiling hooks. 61 * @cpunum: The processor instance. 62 * 63 * FIXME: doesn't do much yet... 64 */ 65 static void 66 init_percpu_prof(unsigned long cpunum) 67 { 68 } 69 70 71 /** 72 * processor_probe - Determine if processor driver should claim this device. 73 * @dev: The device which has been found. 74 * 75 * Determine if processor driver should claim this chip (return 0) or not 76 * (return 1). If so, initialize the chip and tell other partners in crime 77 * they have work to do. 78 */ 79 static int __init processor_probe(struct parisc_device *dev) 80 { 81 unsigned long txn_addr; 82 unsigned long cpuid; 83 struct cpuinfo_parisc *p; 84 struct pdc_pat_cpu_num cpu_info = { }; 85 86 #ifdef CONFIG_SMP 87 if (num_online_cpus() >= nr_cpu_ids) { 88 printk(KERN_INFO "num_online_cpus() >= nr_cpu_ids\n"); 89 return 1; 90 } 91 #else 92 if (boot_cpu_data.cpu_count > 0) { 93 printk(KERN_INFO "CONFIG_SMP=n ignoring additional CPUs\n"); 94 return 1; 95 } 96 #endif 97 98 /* logical CPU ID and update global counter 99 * May get overwritten by PAT code. 100 */ 101 cpuid = boot_cpu_data.cpu_count; 102 txn_addr = dev->hpa.start; /* for legacy PDC */ 103 cpu_info.cpu_num = cpu_info.cpu_loc = cpuid; 104 105 #ifdef CONFIG_64BIT 106 if (is_pdc_pat()) { 107 ulong status; 108 unsigned long bytecnt; 109 pdc_pat_cell_mod_maddr_block_t *pa_pdc_cell; 110 111 pa_pdc_cell = kmalloc(sizeof (*pa_pdc_cell), GFP_KERNEL); 112 if (!pa_pdc_cell) 113 panic("couldn't allocate memory for PDC_PAT_CELL!"); 114 115 status = pdc_pat_cell_module(&bytecnt, dev->pcell_loc, 116 dev->mod_index, PA_VIEW, pa_pdc_cell); 117 118 BUG_ON(PDC_OK != status); 119 120 /* verify it's the same as what do_pat_inventory() found */ 121 BUG_ON(dev->mod_info != pa_pdc_cell->mod_info); 122 BUG_ON(dev->pmod_loc != pa_pdc_cell->mod_location); 123 124 txn_addr = pa_pdc_cell->mod[0]; /* id_eid for IO sapic */ 125 126 kfree(pa_pdc_cell); 127 128 /* get the cpu number */ 129 status = pdc_pat_cpu_get_number(&cpu_info, dev->hpa.start); 130 BUG_ON(PDC_OK != status); 131 132 pr_info("Logical CPU #%lu is physical cpu #%lu at location " 133 "0x%lx with hpa %pa\n", 134 cpuid, cpu_info.cpu_num, cpu_info.cpu_loc, 135 &dev->hpa.start); 136 137 #undef USE_PAT_CPUID 138 #ifdef USE_PAT_CPUID 139 /* We need contiguous numbers for cpuid. Firmware's notion 140 * of cpuid is for physical CPUs and we just don't care yet. 141 * We'll care when we need to query PAT PDC about a CPU *after* 142 * boot time (ie shutdown a CPU from an OS perspective). 143 */ 144 if (cpu_info.cpu_num >= NR_CPUS) { 145 printk(KERN_WARNING "IGNORING CPU at %pa," 146 " cpu_slot_id > NR_CPUS" 147 " (%ld > %d)\n", 148 &dev->hpa.start, cpu_info.cpu_num, NR_CPUS); 149 /* Ignore CPU since it will only crash */ 150 boot_cpu_data.cpu_count--; 151 return 1; 152 } else { 153 cpuid = cpu_info.cpu_num; 154 } 155 #endif 156 } 157 #endif 158 159 p = &per_cpu(cpu_data, cpuid); 160 boot_cpu_data.cpu_count++; 161 162 /* initialize counters - CPU 0 gets it_value set in time_init() */ 163 if (cpuid) 164 memset(p, 0, sizeof(struct cpuinfo_parisc)); 165 166 p->dev = dev; /* Save IODC data in case we need it */ 167 p->hpa = dev->hpa.start; /* save CPU hpa */ 168 p->cpuid = cpuid; /* save CPU id */ 169 p->txn_addr = txn_addr; /* save CPU IRQ address */ 170 p->cpu_num = cpu_info.cpu_num; 171 p->cpu_loc = cpu_info.cpu_loc; 172 173 store_cpu_topology(cpuid); 174 175 #ifdef CONFIG_SMP 176 /* 177 ** FIXME: review if any other initialization is clobbered 178 ** for boot_cpu by the above memset(). 179 */ 180 init_percpu_prof(cpuid); 181 #endif 182 183 /* 184 ** CONFIG_SMP: init_smp_config() will attempt to get CPUs into 185 ** OS control. RENDEZVOUS is the default state - see mem_set above. 186 ** p->state = STATE_RENDEZVOUS; 187 */ 188 189 #if 0 190 /* CPU 0 IRQ table is statically allocated/initialized */ 191 if (cpuid) { 192 struct irqaction actions[]; 193 194 /* 195 ** itimer and ipi IRQ handlers are statically initialized in 196 ** arch/parisc/kernel/irq.c. ie Don't need to register them. 197 */ 198 actions = kmalloc(sizeof(struct irqaction)*MAX_CPU_IRQ, GFP_ATOMIC); 199 if (!actions) { 200 /* not getting it's own table, share with monarch */ 201 actions = cpu_irq_actions[0]; 202 } 203 204 cpu_irq_actions[cpuid] = actions; 205 } 206 #endif 207 208 /* 209 * Bring this CPU up now! (ignore bootstrap cpuid == 0) 210 */ 211 #ifdef CONFIG_SMP 212 if (cpuid) { 213 set_cpu_present(cpuid, true); 214 add_cpu(cpuid); 215 } 216 #endif 217 218 return 0; 219 } 220 221 /** 222 * collect_boot_cpu_data - Fill the boot_cpu_data structure. 223 * 224 * This function collects and stores the generic processor information 225 * in the boot_cpu_data structure. 226 */ 227 void __init collect_boot_cpu_data(void) 228 { 229 unsigned long cr16_seed; 230 char orig_prod_num[64], current_prod_num[64], serial_no[64]; 231 232 memset(&boot_cpu_data, 0, sizeof(boot_cpu_data)); 233 234 cr16_seed = get_cycles(); 235 add_device_randomness(&cr16_seed, sizeof(cr16_seed)); 236 237 boot_cpu_data.cpu_hz = 100 * PAGE0->mem_10msec; /* Hz of this PARISC */ 238 239 /* get CPU-Model Information... */ 240 #define p ((unsigned long *)&boot_cpu_data.pdc.model) 241 if (pdc_model_info(&boot_cpu_data.pdc.model) == PDC_OK) { 242 printk(KERN_INFO 243 "model %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n", 244 p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7], p[8]); 245 246 add_device_randomness(&boot_cpu_data.pdc.model, 247 sizeof(boot_cpu_data.pdc.model)); 248 } 249 #undef p 250 251 if (pdc_model_versions(&boot_cpu_data.pdc.versions, 0) == PDC_OK) { 252 printk(KERN_INFO "vers %08lx\n", 253 boot_cpu_data.pdc.versions); 254 255 add_device_randomness(&boot_cpu_data.pdc.versions, 256 sizeof(boot_cpu_data.pdc.versions)); 257 } 258 259 if (pdc_model_cpuid(&boot_cpu_data.pdc.cpuid) == PDC_OK) { 260 printk(KERN_INFO "CPUID vers %ld rev %ld (0x%08lx)\n", 261 (boot_cpu_data.pdc.cpuid >> 5) & 127, 262 boot_cpu_data.pdc.cpuid & 31, 263 boot_cpu_data.pdc.cpuid); 264 265 add_device_randomness(&boot_cpu_data.pdc.cpuid, 266 sizeof(boot_cpu_data.pdc.cpuid)); 267 } 268 269 if (pdc_model_capabilities(&boot_cpu_data.pdc.capabilities) == PDC_OK) 270 printk(KERN_INFO "capabilities 0x%lx\n", 271 boot_cpu_data.pdc.capabilities); 272 273 if (pdc_model_sysmodel(boot_cpu_data.pdc.sys_model_name) == PDC_OK) 274 printk(KERN_INFO "model %s\n", 275 boot_cpu_data.pdc.sys_model_name); 276 277 dump_stack_set_arch_desc("%s", boot_cpu_data.pdc.sys_model_name); 278 279 boot_cpu_data.hversion = boot_cpu_data.pdc.model.hversion; 280 boot_cpu_data.sversion = boot_cpu_data.pdc.model.sversion; 281 282 boot_cpu_data.cpu_type = parisc_get_cpu_type(boot_cpu_data.hversion); 283 boot_cpu_data.cpu_name = cpu_name_version[boot_cpu_data.cpu_type][0]; 284 boot_cpu_data.family_name = cpu_name_version[boot_cpu_data.cpu_type][1]; 285 286 #ifdef CONFIG_PA8X00 287 _parisc_requires_coherency = (boot_cpu_data.cpu_type == mako) || 288 (boot_cpu_data.cpu_type == mako2); 289 #endif 290 291 if (pdc_model_platform_info(orig_prod_num, current_prod_num, serial_no) == PDC_OK) { 292 printk(KERN_INFO "product %s, original product %s, S/N: %s\n", 293 current_prod_num[0] ? current_prod_num : "n/a", 294 orig_prod_num, serial_no); 295 add_device_randomness(orig_prod_num, strlen(orig_prod_num)); 296 add_device_randomness(current_prod_num, strlen(current_prod_num)); 297 add_device_randomness(serial_no, strlen(serial_no)); 298 } 299 } 300 301 302 /** 303 * init_per_cpu - Handle individual processor initializations. 304 * @cpunum: logical processor number. 305 * 306 * This function handles initialization for *every* CPU 307 * in the system: 308 * 309 * o Set "default" CPU width for trap handlers 310 * 311 * o Enable FP coprocessor 312 * REVISIT: this could be done in the "code 22" trap handler. 313 * (frowands idea - that way we know which processes need FP 314 * registers saved on the interrupt stack.) 315 * NEWS FLASH: wide kernels need FP coprocessor enabled to handle 316 * formatted printing of %lx for example (double divides I think) 317 * 318 * o Enable CPU profiling hooks. 319 */ 320 int __init init_per_cpu(int cpunum) 321 { 322 int ret; 323 struct pdc_coproc_cfg coproc_cfg; 324 325 set_firmware_width(); 326 ret = pdc_coproc_cfg(&coproc_cfg); 327 328 store_cpu_topology(cpunum); 329 330 if(ret >= 0 && coproc_cfg.ccr_functional) { 331 mtctl(coproc_cfg.ccr_functional, 10); /* 10 == Coprocessor Control Reg */ 332 333 /* FWIW, FP rev/model is a more accurate way to determine 334 ** CPU type. CPU rev/model has some ambiguous cases. 335 */ 336 per_cpu(cpu_data, cpunum).fp_rev = coproc_cfg.revision; 337 per_cpu(cpu_data, cpunum).fp_model = coproc_cfg.model; 338 339 if (cpunum == 0) 340 printk(KERN_INFO "FP[%d] enabled: Rev %ld Model %ld\n", 341 cpunum, coproc_cfg.revision, coproc_cfg.model); 342 343 /* 344 ** store status register to stack (hopefully aligned) 345 ** and clear the T-bit. 346 */ 347 asm volatile ("fstd %fr0,8(%sp)"); 348 349 } else { 350 printk(KERN_WARNING "WARNING: No FP CoProcessor?!" 351 " (coproc_cfg.ccr_functional == 0x%lx, expected 0xc0)\n" 352 #ifdef CONFIG_64BIT 353 "Halting Machine - FP required\n" 354 #endif 355 , coproc_cfg.ccr_functional); 356 #ifdef CONFIG_64BIT 357 mdelay(100); /* previous chars get pushed to console */ 358 panic("FP CoProc not reported"); 359 #endif 360 } 361 362 /* FUTURE: Enable Performance Monitor : ccr bit 0x20 */ 363 init_percpu_prof(cpunum); 364 365 return ret; 366 } 367 368 /* 369 * Display CPU info for all CPUs. 370 */ 371 int 372 show_cpuinfo (struct seq_file *m, void *v) 373 { 374 unsigned long cpu; 375 376 for_each_online_cpu(cpu) { 377 const struct cpuinfo_parisc *cpuinfo = &per_cpu(cpu_data, cpu); 378 #ifdef CONFIG_SMP 379 if (0 == cpuinfo->hpa) 380 continue; 381 #endif 382 seq_printf(m, "processor\t: %lu\n" 383 "cpu family\t: PA-RISC %s\n", 384 cpu, boot_cpu_data.family_name); 385 386 seq_printf(m, "cpu\t\t: %s\n", boot_cpu_data.cpu_name ); 387 388 /* cpu MHz */ 389 seq_printf(m, "cpu MHz\t\t: %d.%06d\n", 390 boot_cpu_data.cpu_hz / 1000000, 391 boot_cpu_data.cpu_hz % 1000000 ); 392 393 #ifdef CONFIG_PARISC_CPU_TOPOLOGY 394 seq_printf(m, "physical id\t: %d\n", 395 topology_physical_package_id(cpu)); 396 seq_printf(m, "siblings\t: %d\n", 397 cpumask_weight(topology_core_cpumask(cpu))); 398 seq_printf(m, "core id\t\t: %d\n", topology_core_id(cpu)); 399 #endif 400 401 seq_printf(m, "capabilities\t:"); 402 if (boot_cpu_data.pdc.capabilities & PDC_MODEL_OS32) 403 seq_puts(m, " os32"); 404 if (boot_cpu_data.pdc.capabilities & PDC_MODEL_OS64) 405 seq_puts(m, " os64"); 406 if (boot_cpu_data.pdc.capabilities & PDC_MODEL_IOPDIR_FDC) 407 seq_puts(m, " iopdir_fdc"); 408 switch (boot_cpu_data.pdc.capabilities & PDC_MODEL_NVA_MASK) { 409 case PDC_MODEL_NVA_SUPPORTED: 410 seq_puts(m, " nva_supported"); 411 break; 412 case PDC_MODEL_NVA_SLOW: 413 seq_puts(m, " nva_slow"); 414 break; 415 case PDC_MODEL_NVA_UNSUPPORTED: 416 seq_puts(m, " needs_equivalent_aliasing"); 417 break; 418 } 419 seq_printf(m, " (0x%02lx)\n", boot_cpu_data.pdc.capabilities); 420 421 seq_printf(m, "model\t\t: %s\n" 422 "model name\t: %s\n", 423 boot_cpu_data.pdc.sys_model_name, 424 cpuinfo->dev ? 425 cpuinfo->dev->name : "Unknown"); 426 427 seq_printf(m, "hversion\t: 0x%08x\n" 428 "sversion\t: 0x%08x\n", 429 boot_cpu_data.hversion, 430 boot_cpu_data.sversion ); 431 432 /* print cachesize info */ 433 show_cache_info(m); 434 435 seq_printf(m, "bogomips\t: %lu.%02lu\n", 436 loops_per_jiffy / (500000 / HZ), 437 loops_per_jiffy / (5000 / HZ) % 100); 438 439 seq_printf(m, "software id\t: %ld\n\n", 440 boot_cpu_data.pdc.model.sw_id); 441 } 442 return 0; 443 } 444 445 static const struct parisc_device_id processor_tbl[] __initconst = { 446 { HPHW_NPROC, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, SVERSION_ANY_ID }, 447 { 0, } 448 }; 449 450 static struct parisc_driver cpu_driver __refdata = { 451 .name = "CPU", 452 .id_table = processor_tbl, 453 .probe = processor_probe 454 }; 455 456 /** 457 * processor_init - Processor initialization procedure. 458 * 459 * Register this driver. 460 */ 461 void __init processor_init(void) 462 { 463 register_parisc_driver(&cpu_driver); 464 } 465