1 /* $Id: processor.c,v 1.1 2002/07/20 16:27:06 rhirst Exp $ 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 * This program is free software; you can redistribute it and/or modify 15 * it under the terms of the GNU General Public License as published by 16 * the Free Software Foundation; either version 2, or (at your option) 17 * any later version. 18 * 19 * This program is distributed in the hope that it will be useful, 20 * but WITHOUT ANY WARRANTY; without even the implied warranty of 21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 22 * GNU General Public License for more details. 23 * 24 * You should have received a copy of the GNU General Public License 25 * along with this program; if not, write to the Free Software 26 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 27 * 28 */ 29 #include <linux/delay.h> 30 #include <linux/init.h> 31 #include <linux/mm.h> 32 #include <linux/module.h> 33 #include <linux/seq_file.h> 34 #include <linux/slab.h> 35 #include <linux/cpu.h> 36 #include <asm/param.h> 37 #include <asm/cache.h> 38 #include <asm/hardware.h> /* for register_parisc_driver() stuff */ 39 #include <asm/processor.h> 40 #include <asm/page.h> 41 #include <asm/pdc.h> 42 #include <asm/pdcpat.h> 43 #include <asm/irq.h> /* for struct irq_region */ 44 #include <asm/parisc-device.h> 45 46 struct system_cpuinfo_parisc boot_cpu_data __read_mostly; 47 EXPORT_SYMBOL(boot_cpu_data); 48 49 DEFINE_PER_CPU(struct cpuinfo_parisc, cpu_data); 50 51 extern int update_cr16_clocksource(void); /* from time.c */ 52 53 /* 54 ** PARISC CPU driver - claim "device" and initialize CPU data structures. 55 ** 56 ** Consolidate per CPU initialization into (mostly) one module. 57 ** Monarch CPU will initialize boot_cpu_data which shouldn't 58 ** change once the system has booted. 59 ** 60 ** The callback *should* do per-instance initialization of 61 ** everything including the monarch. "Per CPU" init code in 62 ** setup.c:start_parisc() has migrated here and start_parisc() 63 ** will call register_parisc_driver(&cpu_driver) before calling do_inventory(). 64 ** 65 ** The goal of consolidating CPU initialization into one place is 66 ** to make sure all CPUs get initialized the same way. 67 ** The code path not shared is how PDC hands control of the CPU to the OS. 68 ** The initialization of OS data structures is the same (done below). 69 */ 70 71 /** 72 * init_cpu_profiler - enable/setup per cpu profiling hooks. 73 * @cpunum: The processor instance. 74 * 75 * FIXME: doesn't do much yet... 76 */ 77 static void __cpuinit 78 init_percpu_prof(unsigned long cpunum) 79 { 80 struct cpuinfo_parisc *p; 81 82 p = &per_cpu(cpu_data, cpunum); 83 p->prof_counter = 1; 84 p->prof_multiplier = 1; 85 } 86 87 88 /** 89 * processor_probe - Determine if processor driver should claim this device. 90 * @dev: The device which has been found. 91 * 92 * Determine if processor driver should claim this chip (return 0) or not 93 * (return 1). If so, initialize the chip and tell other partners in crime 94 * they have work to do. 95 */ 96 static int __cpuinit processor_probe(struct parisc_device *dev) 97 { 98 unsigned long txn_addr; 99 unsigned long cpuid; 100 struct cpuinfo_parisc *p; 101 102 #ifdef CONFIG_SMP 103 if (num_online_cpus() >= nr_cpu_ids) { 104 printk(KERN_INFO "num_online_cpus() >= nr_cpu_ids\n"); 105 return 1; 106 } 107 #else 108 if (boot_cpu_data.cpu_count > 0) { 109 printk(KERN_INFO "CONFIG_SMP=n ignoring additional CPUs\n"); 110 return 1; 111 } 112 #endif 113 114 /* logical CPU ID and update global counter 115 * May get overwritten by PAT code. 116 */ 117 cpuid = boot_cpu_data.cpu_count; 118 txn_addr = dev->hpa.start; /* for legacy PDC */ 119 120 #ifdef CONFIG_64BIT 121 if (is_pdc_pat()) { 122 ulong status; 123 unsigned long bytecnt; 124 pdc_pat_cell_mod_maddr_block_t pa_pdc_cell; 125 #undef USE_PAT_CPUID 126 #ifdef USE_PAT_CPUID 127 struct pdc_pat_cpu_num cpu_info; 128 #endif 129 130 status = pdc_pat_cell_module(&bytecnt, dev->pcell_loc, 131 dev->mod_index, PA_VIEW, &pa_pdc_cell); 132 133 BUG_ON(PDC_OK != status); 134 135 /* verify it's the same as what do_pat_inventory() found */ 136 BUG_ON(dev->mod_info != pa_pdc_cell.mod_info); 137 BUG_ON(dev->pmod_loc != pa_pdc_cell.mod_location); 138 139 txn_addr = pa_pdc_cell.mod[0]; /* id_eid for IO sapic */ 140 141 #ifdef USE_PAT_CPUID 142 /* We need contiguous numbers for cpuid. Firmware's notion 143 * of cpuid is for physical CPUs and we just don't care yet. 144 * We'll care when we need to query PAT PDC about a CPU *after* 145 * boot time (ie shutdown a CPU from an OS perspective). 146 */ 147 /* get the cpu number */ 148 status = pdc_pat_cpu_get_number(&cpu_info, dev->hpa.start); 149 150 BUG_ON(PDC_OK != status); 151 152 if (cpu_info.cpu_num >= NR_CPUS) { 153 printk(KERN_WARNING "IGNORING CPU at 0x%x," 154 " cpu_slot_id > NR_CPUS" 155 " (%ld > %d)\n", 156 dev->hpa.start, cpu_info.cpu_num, NR_CPUS); 157 /* Ignore CPU since it will only crash */ 158 boot_cpu_data.cpu_count--; 159 return 1; 160 } else { 161 cpuid = cpu_info.cpu_num; 162 } 163 #endif 164 } 165 #endif 166 167 p = &per_cpu(cpu_data, cpuid); 168 boot_cpu_data.cpu_count++; 169 170 /* initialize counters - CPU 0 gets it_value set in time_init() */ 171 if (cpuid) 172 memset(p, 0, sizeof(struct cpuinfo_parisc)); 173 174 p->loops_per_jiffy = loops_per_jiffy; 175 p->dev = dev; /* Save IODC data in case we need it */ 176 p->hpa = dev->hpa.start; /* save CPU hpa */ 177 p->cpuid = cpuid; /* save CPU id */ 178 p->txn_addr = txn_addr; /* save CPU IRQ address */ 179 #ifdef CONFIG_SMP 180 /* 181 ** FIXME: review if any other initialization is clobbered 182 ** for boot_cpu by the above memset(). 183 */ 184 init_percpu_prof(cpuid); 185 #endif 186 187 /* 188 ** CONFIG_SMP: init_smp_config() will attempt to get CPUs into 189 ** OS control. RENDEZVOUS is the default state - see mem_set above. 190 ** p->state = STATE_RENDEZVOUS; 191 */ 192 193 #if 0 194 /* CPU 0 IRQ table is statically allocated/initialized */ 195 if (cpuid) { 196 struct irqaction actions[]; 197 198 /* 199 ** itimer and ipi IRQ handlers are statically initialized in 200 ** arch/parisc/kernel/irq.c. ie Don't need to register them. 201 */ 202 actions = kmalloc(sizeof(struct irqaction)*MAX_CPU_IRQ, GFP_ATOMIC); 203 if (!actions) { 204 /* not getting it's own table, share with monarch */ 205 actions = cpu_irq_actions[0]; 206 } 207 208 cpu_irq_actions[cpuid] = actions; 209 } 210 #endif 211 212 /* 213 * Bring this CPU up now! (ignore bootstrap cpuid == 0) 214 */ 215 #ifdef CONFIG_SMP 216 if (cpuid) { 217 set_cpu_present(cpuid, true); 218 cpu_up(cpuid); 219 } 220 #endif 221 222 /* If we've registered more than one cpu, 223 * we'll use the jiffies clocksource since cr16 224 * is not synchronized between CPUs. 225 */ 226 update_cr16_clocksource(); 227 228 return 0; 229 } 230 231 /** 232 * collect_boot_cpu_data - Fill the boot_cpu_data structure. 233 * 234 * This function collects and stores the generic processor information 235 * in the boot_cpu_data structure. 236 */ 237 void __init collect_boot_cpu_data(void) 238 { 239 memset(&boot_cpu_data, 0, sizeof(boot_cpu_data)); 240 241 boot_cpu_data.cpu_hz = 100 * PAGE0->mem_10msec; /* Hz of this PARISC */ 242 243 /* get CPU-Model Information... */ 244 #define p ((unsigned long *)&boot_cpu_data.pdc.model) 245 if (pdc_model_info(&boot_cpu_data.pdc.model) == PDC_OK) 246 printk(KERN_INFO 247 "model %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n", 248 p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7], p[8]); 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 if (pdc_model_cpuid(&boot_cpu_data.pdc.cpuid) == PDC_OK) 256 printk(KERN_INFO "CPUID vers %ld rev %ld (0x%08lx)\n", 257 (boot_cpu_data.pdc.cpuid >> 5) & 127, 258 boot_cpu_data.pdc.cpuid & 31, 259 boot_cpu_data.pdc.cpuid); 260 261 if (pdc_model_capabilities(&boot_cpu_data.pdc.capabilities) == PDC_OK) 262 printk(KERN_INFO "capabilities 0x%lx\n", 263 boot_cpu_data.pdc.capabilities); 264 265 if (pdc_model_sysmodel(boot_cpu_data.pdc.sys_model_name) == PDC_OK) 266 printk(KERN_INFO "model %s\n", 267 boot_cpu_data.pdc.sys_model_name); 268 269 boot_cpu_data.hversion = boot_cpu_data.pdc.model.hversion; 270 boot_cpu_data.sversion = boot_cpu_data.pdc.model.sversion; 271 272 boot_cpu_data.cpu_type = parisc_get_cpu_type(boot_cpu_data.hversion); 273 boot_cpu_data.cpu_name = cpu_name_version[boot_cpu_data.cpu_type][0]; 274 boot_cpu_data.family_name = cpu_name_version[boot_cpu_data.cpu_type][1]; 275 } 276 277 278 279 /** 280 * init_per_cpu - Handle individual processor initializations. 281 * @cpunum: logical processor number. 282 * 283 * This function handles initialization for *every* CPU 284 * in the system: 285 * 286 * o Set "default" CPU width for trap handlers 287 * 288 * o Enable FP coprocessor 289 * REVISIT: this could be done in the "code 22" trap handler. 290 * (frowands idea - that way we know which processes need FP 291 * registers saved on the interrupt stack.) 292 * NEWS FLASH: wide kernels need FP coprocessor enabled to handle 293 * formatted printing of %lx for example (double divides I think) 294 * 295 * o Enable CPU profiling hooks. 296 */ 297 int __cpuinit init_per_cpu(int cpunum) 298 { 299 int ret; 300 struct pdc_coproc_cfg coproc_cfg; 301 302 set_firmware_width(); 303 ret = pdc_coproc_cfg(&coproc_cfg); 304 305 if(ret >= 0 && coproc_cfg.ccr_functional) { 306 mtctl(coproc_cfg.ccr_functional, 10); /* 10 == Coprocessor Control Reg */ 307 308 /* FWIW, FP rev/model is a more accurate way to determine 309 ** CPU type. CPU rev/model has some ambiguous cases. 310 */ 311 per_cpu(cpu_data, cpunum).fp_rev = coproc_cfg.revision; 312 per_cpu(cpu_data, cpunum).fp_model = coproc_cfg.model; 313 314 printk(KERN_INFO "FP[%d] enabled: Rev %ld Model %ld\n", 315 cpunum, coproc_cfg.revision, coproc_cfg.model); 316 317 /* 318 ** store status register to stack (hopefully aligned) 319 ** and clear the T-bit. 320 */ 321 asm volatile ("fstd %fr0,8(%sp)"); 322 323 } else { 324 printk(KERN_WARNING "WARNING: No FP CoProcessor?!" 325 " (coproc_cfg.ccr_functional == 0x%lx, expected 0xc0)\n" 326 #ifdef CONFIG_64BIT 327 "Halting Machine - FP required\n" 328 #endif 329 , coproc_cfg.ccr_functional); 330 #ifdef CONFIG_64BIT 331 mdelay(100); /* previous chars get pushed to console */ 332 panic("FP CoProc not reported"); 333 #endif 334 } 335 336 /* FUTURE: Enable Performance Monitor : ccr bit 0x20 */ 337 init_percpu_prof(cpunum); 338 339 return ret; 340 } 341 342 /* 343 * Display CPU info for all CPUs. 344 */ 345 int 346 show_cpuinfo (struct seq_file *m, void *v) 347 { 348 unsigned long cpu; 349 350 for_each_online_cpu(cpu) { 351 const struct cpuinfo_parisc *cpuinfo = &per_cpu(cpu_data, cpu); 352 #ifdef CONFIG_SMP 353 if (0 == cpuinfo->hpa) 354 continue; 355 #endif 356 seq_printf(m, "processor\t: %lu\n" 357 "cpu family\t: PA-RISC %s\n", 358 cpu, boot_cpu_data.family_name); 359 360 seq_printf(m, "cpu\t\t: %s\n", boot_cpu_data.cpu_name ); 361 362 /* cpu MHz */ 363 seq_printf(m, "cpu MHz\t\t: %d.%06d\n", 364 boot_cpu_data.cpu_hz / 1000000, 365 boot_cpu_data.cpu_hz % 1000000 ); 366 367 seq_printf(m, "capabilities\t:"); 368 if (boot_cpu_data.pdc.capabilities & PDC_MODEL_OS32) 369 seq_printf(m, " os32"); 370 if (boot_cpu_data.pdc.capabilities & PDC_MODEL_OS64) 371 seq_printf(m, " os64"); 372 seq_printf(m, "\n"); 373 374 seq_printf(m, "model\t\t: %s\n" 375 "model name\t: %s\n", 376 boot_cpu_data.pdc.sys_model_name, 377 cpuinfo->dev ? 378 cpuinfo->dev->name : "Unknown"); 379 380 seq_printf(m, "hversion\t: 0x%08x\n" 381 "sversion\t: 0x%08x\n", 382 boot_cpu_data.hversion, 383 boot_cpu_data.sversion ); 384 385 /* print cachesize info */ 386 show_cache_info(m); 387 388 seq_printf(m, "bogomips\t: %lu.%02lu\n", 389 cpuinfo->loops_per_jiffy / (500000 / HZ), 390 (cpuinfo->loops_per_jiffy / (5000 / HZ)) % 100); 391 392 seq_printf(m, "software id\t: %ld\n\n", 393 boot_cpu_data.pdc.model.sw_id); 394 } 395 return 0; 396 } 397 398 static const struct parisc_device_id processor_tbl[] = { 399 { HPHW_NPROC, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, SVERSION_ANY_ID }, 400 { 0, } 401 }; 402 403 static struct parisc_driver cpu_driver = { 404 .name = "CPU", 405 .id_table = processor_tbl, 406 .probe = processor_probe 407 }; 408 409 /** 410 * processor_init - Processor initialization procedure. 411 * 412 * Register this driver. 413 */ 414 void __init processor_init(void) 415 { 416 register_parisc_driver(&cpu_driver); 417 } 418