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/topology.h> 23 #include <asm/param.h> 24 #include <asm/cache.h> 25 #include <asm/hardware.h> /* for register_parisc_driver() stuff */ 26 #include <asm/processor.h> 27 #include <asm/page.h> 28 #include <asm/pdc.h> 29 #include <asm/pdcpat.h> 30 #include <asm/irq.h> /* for struct irq_region */ 31 #include <asm/parisc-device.h> 32 33 struct system_cpuinfo_parisc boot_cpu_data __ro_after_init; 34 EXPORT_SYMBOL(boot_cpu_data); 35 #ifdef CONFIG_PA8X00 36 int _parisc_requires_coherency __ro_after_init; 37 EXPORT_SYMBOL(_parisc_requires_coherency); 38 #endif 39 40 DEFINE_PER_CPU(struct cpuinfo_parisc, cpu_data); 41 42 /* 43 ** PARISC CPU driver - claim "device" and initialize CPU data structures. 44 ** 45 ** Consolidate per CPU initialization into (mostly) one module. 46 ** Monarch CPU will initialize boot_cpu_data which shouldn't 47 ** change once the system has booted. 48 ** 49 ** The callback *should* do per-instance initialization of 50 ** everything including the monarch. "Per CPU" init code in 51 ** setup.c:start_parisc() has migrated here and start_parisc() 52 ** will call register_parisc_driver(&cpu_driver) before calling do_inventory(). 53 ** 54 ** The goal of consolidating CPU initialization into one place is 55 ** to make sure all CPUs get initialized the same way. 56 ** The code path not shared is how PDC hands control of the CPU to the OS. 57 ** The initialization of OS data structures is the same (done below). 58 */ 59 60 /** 61 * init_cpu_profiler - enable/setup per cpu profiling hooks. 62 * @cpunum: The processor instance. 63 * 64 * FIXME: doesn't do much yet... 65 */ 66 static void 67 init_percpu_prof(unsigned long cpunum) 68 { 69 } 70 71 72 /** 73 * processor_probe - Determine if processor driver should claim this device. 74 * @dev: The device which has been found. 75 * 76 * Determine if processor driver should claim this chip (return 0) or not 77 * (return 1). If so, initialize the chip and tell other partners in crime 78 * they have work to do. 79 */ 80 static int __init processor_probe(struct parisc_device *dev) 81 { 82 unsigned long txn_addr; 83 unsigned long cpuid; 84 struct cpuinfo_parisc *p; 85 struct pdc_pat_cpu_num cpu_info = { }; 86 87 #ifdef CONFIG_SMP 88 if (num_online_cpus() >= nr_cpu_ids) { 89 printk(KERN_INFO "num_online_cpus() >= nr_cpu_ids\n"); 90 return 1; 91 } 92 #else 93 if (boot_cpu_data.cpu_count > 0) { 94 printk(KERN_INFO "CONFIG_SMP=n ignoring additional CPUs\n"); 95 return 1; 96 } 97 #endif 98 99 /* logical CPU ID and update global counter 100 * May get overwritten by PAT code. 101 */ 102 cpuid = boot_cpu_data.cpu_count; 103 txn_addr = dev->hpa.start; /* for legacy PDC */ 104 cpu_info.cpu_num = cpu_info.cpu_loc = cpuid; 105 106 #ifdef CONFIG_64BIT 107 if (is_pdc_pat()) { 108 ulong status; 109 unsigned long bytecnt; 110 pdc_pat_cell_mod_maddr_block_t *pa_pdc_cell; 111 112 pa_pdc_cell = kmalloc(sizeof (*pa_pdc_cell), GFP_KERNEL); 113 if (!pa_pdc_cell) 114 panic("couldn't allocate memory for PDC_PAT_CELL!"); 115 116 status = pdc_pat_cell_module(&bytecnt, dev->pcell_loc, 117 dev->mod_index, PA_VIEW, pa_pdc_cell); 118 119 BUG_ON(PDC_OK != status); 120 121 /* verify it's the same as what do_pat_inventory() found */ 122 BUG_ON(dev->mod_info != pa_pdc_cell->mod_info); 123 BUG_ON(dev->pmod_loc != pa_pdc_cell->mod_location); 124 125 txn_addr = pa_pdc_cell->mod[0]; /* id_eid for IO sapic */ 126 127 kfree(pa_pdc_cell); 128 129 /* get the cpu number */ 130 status = pdc_pat_cpu_get_number(&cpu_info, dev->hpa.start); 131 BUG_ON(PDC_OK != status); 132 133 pr_info("Logical CPU #%lu is physical cpu #%lu at location " 134 "0x%lx with hpa %pa\n", 135 cpuid, cpu_info.cpu_num, cpu_info.cpu_loc, 136 &dev->hpa.start); 137 138 #undef USE_PAT_CPUID 139 #ifdef USE_PAT_CPUID 140 /* We need contiguous numbers for cpuid. Firmware's notion 141 * of cpuid is for physical CPUs and we just don't care yet. 142 * We'll care when we need to query PAT PDC about a CPU *after* 143 * boot time (ie shutdown a CPU from an OS perspective). 144 */ 145 if (cpu_info.cpu_num >= NR_CPUS) { 146 printk(KERN_WARNING "IGNORING CPU at %pa," 147 " cpu_slot_id > NR_CPUS" 148 " (%ld > %d)\n", 149 &dev->hpa.start, cpu_info.cpu_num, NR_CPUS); 150 /* Ignore CPU since it will only crash */ 151 boot_cpu_data.cpu_count--; 152 return 1; 153 } else { 154 cpuid = cpu_info.cpu_num; 155 } 156 #endif 157 } 158 #endif 159 160 p = &per_cpu(cpu_data, cpuid); 161 boot_cpu_data.cpu_count++; 162 163 /* initialize counters - CPU 0 gets it_value set in time_init() */ 164 if (cpuid) 165 memset(p, 0, sizeof(struct cpuinfo_parisc)); 166 167 p->dev = dev; /* Save IODC data in case we need it */ 168 p->hpa = dev->hpa.start; /* save CPU hpa */ 169 p->cpuid = cpuid; /* save CPU id */ 170 p->txn_addr = txn_addr; /* save CPU IRQ address */ 171 p->cpu_num = cpu_info.cpu_num; 172 p->cpu_loc = cpu_info.cpu_loc; 173 174 store_cpu_topology(cpuid); 175 176 #ifdef CONFIG_SMP 177 /* 178 ** FIXME: review if any other initialization is clobbered 179 ** for boot_cpu by the above memset(). 180 */ 181 init_percpu_prof(cpuid); 182 #endif 183 184 /* 185 ** CONFIG_SMP: init_smp_config() will attempt to get CPUs into 186 ** OS control. RENDEZVOUS is the default state - see mem_set above. 187 ** p->state = STATE_RENDEZVOUS; 188 */ 189 190 #if 0 191 /* CPU 0 IRQ table is statically allocated/initialized */ 192 if (cpuid) { 193 struct irqaction actions[]; 194 195 /* 196 ** itimer and ipi IRQ handlers are statically initialized in 197 ** arch/parisc/kernel/irq.c. ie Don't need to register them. 198 */ 199 actions = kmalloc(sizeof(struct irqaction)*MAX_CPU_IRQ, GFP_ATOMIC); 200 if (!actions) { 201 /* not getting it's own table, share with monarch */ 202 actions = cpu_irq_actions[0]; 203 } 204 205 cpu_irq_actions[cpuid] = actions; 206 } 207 #endif 208 209 /* 210 * Bring this CPU up now! (ignore bootstrap cpuid == 0) 211 */ 212 #ifdef CONFIG_SMP 213 if (cpuid) { 214 set_cpu_present(cpuid, true); 215 add_cpu(cpuid); 216 } 217 #endif 218 219 return 0; 220 } 221 222 /** 223 * collect_boot_cpu_data - Fill the boot_cpu_data structure. 224 * 225 * This function collects and stores the generic processor information 226 * in the boot_cpu_data structure. 227 */ 228 void __init collect_boot_cpu_data(void) 229 { 230 unsigned long cr16_seed; 231 char orig_prod_num[64], current_prod_num[64], serial_no[64]; 232 233 memset(&boot_cpu_data, 0, sizeof(boot_cpu_data)); 234 235 cr16_seed = get_cycles(); 236 add_device_randomness(&cr16_seed, sizeof(cr16_seed)); 237 238 boot_cpu_data.cpu_hz = 100 * PAGE0->mem_10msec; /* Hz of this PARISC */ 239 240 /* get CPU-Model Information... */ 241 #define p ((unsigned long *)&boot_cpu_data.pdc.model) 242 if (pdc_model_info(&boot_cpu_data.pdc.model) == PDC_OK) { 243 printk(KERN_INFO 244 "model %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n", 245 p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7], p[8]); 246 247 add_device_randomness(&boot_cpu_data.pdc.model, 248 sizeof(boot_cpu_data.pdc.model)); 249 } 250 #undef p 251 252 if (pdc_model_versions(&boot_cpu_data.pdc.versions, 0) == PDC_OK) { 253 printk(KERN_INFO "vers %08lx\n", 254 boot_cpu_data.pdc.versions); 255 256 add_device_randomness(&boot_cpu_data.pdc.versions, 257 sizeof(boot_cpu_data.pdc.versions)); 258 } 259 260 if (pdc_model_cpuid(&boot_cpu_data.pdc.cpuid) == PDC_OK) { 261 printk(KERN_INFO "CPUID vers %ld rev %ld (0x%08lx)\n", 262 (boot_cpu_data.pdc.cpuid >> 5) & 127, 263 boot_cpu_data.pdc.cpuid & 31, 264 boot_cpu_data.pdc.cpuid); 265 266 add_device_randomness(&boot_cpu_data.pdc.cpuid, 267 sizeof(boot_cpu_data.pdc.cpuid)); 268 } 269 270 if (pdc_model_capabilities(&boot_cpu_data.pdc.capabilities) == PDC_OK) 271 printk(KERN_INFO "capabilities 0x%lx\n", 272 boot_cpu_data.pdc.capabilities); 273 274 if (pdc_model_sysmodel(boot_cpu_data.pdc.sys_model_name) == PDC_OK) 275 printk(KERN_INFO "model %s\n", 276 boot_cpu_data.pdc.sys_model_name); 277 278 dump_stack_set_arch_desc("%s", boot_cpu_data.pdc.sys_model_name); 279 280 boot_cpu_data.hversion = boot_cpu_data.pdc.model.hversion; 281 boot_cpu_data.sversion = boot_cpu_data.pdc.model.sversion; 282 283 boot_cpu_data.cpu_type = parisc_get_cpu_type(boot_cpu_data.hversion); 284 boot_cpu_data.cpu_name = cpu_name_version[boot_cpu_data.cpu_type][0]; 285 boot_cpu_data.family_name = cpu_name_version[boot_cpu_data.cpu_type][1]; 286 287 #ifdef CONFIG_PA8X00 288 _parisc_requires_coherency = (boot_cpu_data.cpu_type == mako) || 289 (boot_cpu_data.cpu_type == mako2); 290 #endif 291 292 if (pdc_model_platform_info(orig_prod_num, current_prod_num, serial_no) == PDC_OK) { 293 printk(KERN_INFO "product %s, original product %s, S/N: %s\n", 294 current_prod_num[0] ? current_prod_num : "n/a", 295 orig_prod_num, serial_no); 296 add_device_randomness(orig_prod_num, strlen(orig_prod_num)); 297 add_device_randomness(current_prod_num, strlen(current_prod_num)); 298 add_device_randomness(serial_no, strlen(serial_no)); 299 } 300 } 301 302 303 /** 304 * init_per_cpu - Handle individual processor initializations. 305 * @cpunum: logical processor number. 306 * 307 * This function handles initialization for *every* CPU 308 * in the system: 309 * 310 * o Set "default" CPU width for trap handlers 311 * 312 * o Enable FP coprocessor 313 * REVISIT: this could be done in the "code 22" trap handler. 314 * (frowands idea - that way we know which processes need FP 315 * registers saved on the interrupt stack.) 316 * NEWS FLASH: wide kernels need FP coprocessor enabled to handle 317 * formatted printing of %lx for example (double divides I think) 318 * 319 * o Enable CPU profiling hooks. 320 */ 321 int init_per_cpu(int cpunum) 322 { 323 int ret; 324 struct pdc_coproc_cfg coproc_cfg; 325 326 set_firmware_width(); 327 ret = pdc_coproc_cfg(&coproc_cfg); 328 329 store_cpu_topology(cpunum); 330 331 if(ret >= 0 && coproc_cfg.ccr_functional) { 332 mtctl(coproc_cfg.ccr_functional, 10); /* 10 == Coprocessor Control Reg */ 333 334 /* FWIW, FP rev/model is a more accurate way to determine 335 ** CPU type. CPU rev/model has some ambiguous cases. 336 */ 337 per_cpu(cpu_data, cpunum).fp_rev = coproc_cfg.revision; 338 per_cpu(cpu_data, cpunum).fp_model = coproc_cfg.model; 339 340 if (cpunum == 0) 341 printk(KERN_INFO "FP[%d] enabled: Rev %ld Model %ld\n", 342 cpunum, coproc_cfg.revision, coproc_cfg.model); 343 344 /* 345 ** store status register to stack (hopefully aligned) 346 ** and clear the T-bit. 347 */ 348 asm volatile ("fstd %fr0,8(%sp)"); 349 350 } else { 351 printk(KERN_WARNING "WARNING: No FP CoProcessor?!" 352 " (coproc_cfg.ccr_functional == 0x%lx, expected 0xc0)\n" 353 #ifdef CONFIG_64BIT 354 "Halting Machine - FP required\n" 355 #endif 356 , coproc_cfg.ccr_functional); 357 #ifdef CONFIG_64BIT 358 mdelay(100); /* previous chars get pushed to console */ 359 panic("FP CoProc not reported"); 360 #endif 361 } 362 363 /* FUTURE: Enable Performance Monitor : ccr bit 0x20 */ 364 init_percpu_prof(cpunum); 365 366 return ret; 367 } 368 369 /* 370 * Display CPU info for all CPUs. 371 */ 372 int 373 show_cpuinfo (struct seq_file *m, void *v) 374 { 375 unsigned long cpu; 376 377 for_each_online_cpu(cpu) { 378 const struct cpuinfo_parisc *cpuinfo = &per_cpu(cpu_data, cpu); 379 #ifdef CONFIG_SMP 380 if (0 == cpuinfo->hpa) 381 continue; 382 #endif 383 seq_printf(m, "processor\t: %lu\n" 384 "cpu family\t: PA-RISC %s\n", 385 cpu, boot_cpu_data.family_name); 386 387 seq_printf(m, "cpu\t\t: %s\n", boot_cpu_data.cpu_name ); 388 389 /* cpu MHz */ 390 seq_printf(m, "cpu MHz\t\t: %d.%06d\n", 391 boot_cpu_data.cpu_hz / 1000000, 392 boot_cpu_data.cpu_hz % 1000000 ); 393 394 #ifdef CONFIG_GENERIC_ARCH_TOPOLOGY 395 seq_printf(m, "physical id\t: %d\n", 396 topology_physical_package_id(cpu)); 397 seq_printf(m, "siblings\t: %d\n", 398 cpumask_weight(topology_core_cpumask(cpu))); 399 seq_printf(m, "core id\t\t: %d\n", topology_core_id(cpu)); 400 #endif 401 402 seq_printf(m, "capabilities\t:"); 403 if (boot_cpu_data.pdc.capabilities & PDC_MODEL_OS32) 404 seq_puts(m, " os32"); 405 if (boot_cpu_data.pdc.capabilities & PDC_MODEL_OS64) 406 seq_puts(m, " os64"); 407 if (boot_cpu_data.pdc.capabilities & PDC_MODEL_IOPDIR_FDC) 408 seq_puts(m, " iopdir_fdc"); 409 switch (boot_cpu_data.pdc.capabilities & PDC_MODEL_NVA_MASK) { 410 case PDC_MODEL_NVA_SUPPORTED: 411 seq_puts(m, " nva_supported"); 412 break; 413 case PDC_MODEL_NVA_SLOW: 414 seq_puts(m, " nva_slow"); 415 break; 416 case PDC_MODEL_NVA_UNSUPPORTED: 417 seq_puts(m, " needs_equivalent_aliasing"); 418 break; 419 } 420 seq_printf(m, " (0x%02lx)\n", boot_cpu_data.pdc.capabilities); 421 422 seq_printf(m, "model\t\t: %s\n" 423 "model name\t: %s\n", 424 boot_cpu_data.pdc.sys_model_name, 425 cpuinfo->dev ? 426 cpuinfo->dev->name : "Unknown"); 427 428 seq_printf(m, "hversion\t: 0x%08x\n" 429 "sversion\t: 0x%08x\n", 430 boot_cpu_data.hversion, 431 boot_cpu_data.sversion ); 432 433 /* print cachesize info */ 434 show_cache_info(m); 435 436 seq_printf(m, "bogomips\t: %lu.%02lu\n", 437 loops_per_jiffy / (500000 / HZ), 438 loops_per_jiffy / (5000 / HZ) % 100); 439 440 seq_printf(m, "software id\t: %ld\n\n", 441 boot_cpu_data.pdc.model.sw_id); 442 } 443 return 0; 444 } 445 446 static const struct parisc_device_id processor_tbl[] __initconst = { 447 { HPHW_NPROC, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, SVERSION_ANY_ID }, 448 { 0, } 449 }; 450 451 static struct parisc_driver cpu_driver __refdata = { 452 .name = "CPU", 453 .id_table = processor_tbl, 454 .probe = processor_probe 455 }; 456 457 /** 458 * processor_init - Processor initialization procedure. 459 * 460 * Register this driver. 461 */ 462 void __init processor_init(void) 463 { 464 reset_cpu_topology(); 465 register_parisc_driver(&cpu_driver); 466 } 467