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 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 struct cpuinfo_parisc cpu_data[NR_CPUS] __read_mostly; 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 * 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 __cpuinit processor_probe(struct parisc_device *dev) 80 { 81 unsigned long txn_addr; 82 unsigned long cpuid; 83 struct cpuinfo_parisc *p; 84 85 #ifndef CONFIG_SMP 86 if (boot_cpu_data.cpu_count > 0) { 87 printk(KERN_INFO "CONFIG_SMP=n ignoring additional CPUs\n"); 88 return 1; 89 } 90 #endif 91 92 /* logical CPU ID and update global counter 93 * May get overwritten by PAT code. 94 */ 95 cpuid = boot_cpu_data.cpu_count; 96 txn_addr = dev->hpa.start; /* for legacy PDC */ 97 98 #ifdef CONFIG_64BIT 99 if (is_pdc_pat()) { 100 ulong status; 101 unsigned long bytecnt; 102 pdc_pat_cell_mod_maddr_block_t pa_pdc_cell; 103 #undef USE_PAT_CPUID 104 #ifdef USE_PAT_CPUID 105 struct pdc_pat_cpu_num cpu_info; 106 #endif 107 108 status = pdc_pat_cell_module(&bytecnt, dev->pcell_loc, 109 dev->mod_index, PA_VIEW, &pa_pdc_cell); 110 111 BUG_ON(PDC_OK != status); 112 113 /* verify it's the same as what do_pat_inventory() found */ 114 BUG_ON(dev->mod_info != pa_pdc_cell.mod_info); 115 BUG_ON(dev->pmod_loc != pa_pdc_cell.mod_location); 116 117 txn_addr = pa_pdc_cell.mod[0]; /* id_eid for IO sapic */ 118 119 #ifdef USE_PAT_CPUID 120 /* We need contiguous numbers for cpuid. Firmware's notion 121 * of cpuid is for physical CPUs and we just don't care yet. 122 * We'll care when we need to query PAT PDC about a CPU *after* 123 * boot time (ie shutdown a CPU from an OS perspective). 124 */ 125 /* get the cpu number */ 126 status = pdc_pat_cpu_get_number(&cpu_info, dev->hpa.start); 127 128 BUG_ON(PDC_OK != status); 129 130 if (cpu_info.cpu_num >= NR_CPUS) { 131 printk(KERN_WARNING "IGNORING CPU at 0x%x," 132 " cpu_slot_id > NR_CPUS" 133 " (%ld > %d)\n", 134 dev->hpa.start, cpu_info.cpu_num, NR_CPUS); 135 /* Ignore CPU since it will only crash */ 136 boot_cpu_data.cpu_count--; 137 return 1; 138 } else { 139 cpuid = cpu_info.cpu_num; 140 } 141 #endif 142 } 143 #endif 144 145 p = &cpu_data[cpuid]; 146 boot_cpu_data.cpu_count++; 147 148 /* initialize counters - CPU 0 gets it_value set in time_init() */ 149 if (cpuid) 150 memset(p, 0, sizeof(struct cpuinfo_parisc)); 151 152 p->loops_per_jiffy = loops_per_jiffy; 153 p->dev = dev; /* Save IODC data in case we need it */ 154 p->hpa = dev->hpa.start; /* save CPU hpa */ 155 p->cpuid = cpuid; /* save CPU id */ 156 p->txn_addr = txn_addr; /* save CPU IRQ address */ 157 #ifdef CONFIG_SMP 158 /* 159 ** FIXME: review if any other initialization is clobbered 160 ** for boot_cpu by the above memset(). 161 */ 162 163 /* stolen from init_percpu_prof() */ 164 cpu_data[cpuid].prof_counter = 1; 165 cpu_data[cpuid].prof_multiplier = 1; 166 #endif 167 168 /* 169 ** CONFIG_SMP: init_smp_config() will attempt to get CPUs into 170 ** OS control. RENDEZVOUS is the default state - see mem_set above. 171 ** p->state = STATE_RENDEZVOUS; 172 */ 173 174 #if 0 175 /* CPU 0 IRQ table is statically allocated/initialized */ 176 if (cpuid) { 177 struct irqaction actions[]; 178 179 /* 180 ** itimer and ipi IRQ handlers are statically initialized in 181 ** arch/parisc/kernel/irq.c. ie Don't need to register them. 182 */ 183 actions = kmalloc(sizeof(struct irqaction)*MAX_CPU_IRQ, GFP_ATOMIC); 184 if (!actions) { 185 /* not getting it's own table, share with monarch */ 186 actions = cpu_irq_actions[0]; 187 } 188 189 cpu_irq_actions[cpuid] = actions; 190 } 191 #endif 192 193 /* 194 * Bring this CPU up now! (ignore bootstrap cpuid == 0) 195 */ 196 #ifdef CONFIG_SMP 197 if (cpuid) { 198 cpu_set(cpuid, cpu_present_map); 199 cpu_up(cpuid); 200 } 201 #endif 202 203 /* If we've registered more than one cpu, 204 * we'll use the jiffies clocksource since cr16 205 * is not synchronized between CPUs. 206 */ 207 update_cr16_clocksource(); 208 209 return 0; 210 } 211 212 /** 213 * collect_boot_cpu_data - Fill the boot_cpu_data structure. 214 * 215 * This function collects and stores the generic processor information 216 * in the boot_cpu_data structure. 217 */ 218 void __init collect_boot_cpu_data(void) 219 { 220 memset(&boot_cpu_data, 0, sizeof(boot_cpu_data)); 221 222 boot_cpu_data.cpu_hz = 100 * PAGE0->mem_10msec; /* Hz of this PARISC */ 223 224 /* get CPU-Model Information... */ 225 #define p ((unsigned long *)&boot_cpu_data.pdc.model) 226 if (pdc_model_info(&boot_cpu_data.pdc.model) == PDC_OK) 227 printk(KERN_INFO 228 "model %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n", 229 p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7], p[8]); 230 #undef p 231 232 if (pdc_model_versions(&boot_cpu_data.pdc.versions, 0) == PDC_OK) 233 printk(KERN_INFO "vers %08lx\n", 234 boot_cpu_data.pdc.versions); 235 236 if (pdc_model_cpuid(&boot_cpu_data.pdc.cpuid) == PDC_OK) 237 printk(KERN_INFO "CPUID vers %ld rev %ld (0x%08lx)\n", 238 (boot_cpu_data.pdc.cpuid >> 5) & 127, 239 boot_cpu_data.pdc.cpuid & 31, 240 boot_cpu_data.pdc.cpuid); 241 242 if (pdc_model_capabilities(&boot_cpu_data.pdc.capabilities) == PDC_OK) 243 printk(KERN_INFO "capabilities 0x%lx\n", 244 boot_cpu_data.pdc.capabilities); 245 246 if (pdc_model_sysmodel(boot_cpu_data.pdc.sys_model_name) == PDC_OK) 247 printk(KERN_INFO "model %s\n", 248 boot_cpu_data.pdc.sys_model_name); 249 250 boot_cpu_data.hversion = boot_cpu_data.pdc.model.hversion; 251 boot_cpu_data.sversion = boot_cpu_data.pdc.model.sversion; 252 253 boot_cpu_data.cpu_type = parisc_get_cpu_type(boot_cpu_data.hversion); 254 boot_cpu_data.cpu_name = cpu_name_version[boot_cpu_data.cpu_type][0]; 255 boot_cpu_data.family_name = cpu_name_version[boot_cpu_data.cpu_type][1]; 256 } 257 258 259 /** 260 * init_cpu_profiler - enable/setup per cpu profiling hooks. 261 * @cpunum: The processor instance. 262 * 263 * FIXME: doesn't do much yet... 264 */ 265 static inline void __init 266 init_percpu_prof(int cpunum) 267 { 268 cpu_data[cpunum].prof_counter = 1; 269 cpu_data[cpunum].prof_multiplier = 1; 270 } 271 272 273 /** 274 * init_per_cpu - Handle individual processor initializations. 275 * @cpunum: logical processor number. 276 * 277 * This function handles initialization for *every* CPU 278 * in the system: 279 * 280 * o Set "default" CPU width for trap handlers 281 * 282 * o Enable FP coprocessor 283 * REVISIT: this could be done in the "code 22" trap handler. 284 * (frowands idea - that way we know which processes need FP 285 * registers saved on the interrupt stack.) 286 * NEWS FLASH: wide kernels need FP coprocessor enabled to handle 287 * formatted printing of %lx for example (double divides I think) 288 * 289 * o Enable CPU profiling hooks. 290 */ 291 int __init init_per_cpu(int cpunum) 292 { 293 int ret; 294 struct pdc_coproc_cfg coproc_cfg; 295 296 set_firmware_width(); 297 ret = pdc_coproc_cfg(&coproc_cfg); 298 299 if(ret >= 0 && coproc_cfg.ccr_functional) { 300 mtctl(coproc_cfg.ccr_functional, 10); /* 10 == Coprocessor Control Reg */ 301 302 /* FWIW, FP rev/model is a more accurate way to determine 303 ** CPU type. CPU rev/model has some ambiguous cases. 304 */ 305 cpu_data[cpunum].fp_rev = coproc_cfg.revision; 306 cpu_data[cpunum].fp_model = coproc_cfg.model; 307 308 printk(KERN_INFO "FP[%d] enabled: Rev %ld Model %ld\n", 309 cpunum, coproc_cfg.revision, coproc_cfg.model); 310 311 /* 312 ** store status register to stack (hopefully aligned) 313 ** and clear the T-bit. 314 */ 315 asm volatile ("fstd %fr0,8(%sp)"); 316 317 } else { 318 printk(KERN_WARNING "WARNING: No FP CoProcessor?!" 319 " (coproc_cfg.ccr_functional == 0x%lx, expected 0xc0)\n" 320 #ifdef CONFIG_64BIT 321 "Halting Machine - FP required\n" 322 #endif 323 , coproc_cfg.ccr_functional); 324 #ifdef CONFIG_64BIT 325 mdelay(100); /* previous chars get pushed to console */ 326 panic("FP CoProc not reported"); 327 #endif 328 } 329 330 /* FUTURE: Enable Performance Monitor : ccr bit 0x20 */ 331 init_percpu_prof(cpunum); 332 333 return ret; 334 } 335 336 /* 337 * Display CPU info for all CPUs. 338 */ 339 int 340 show_cpuinfo (struct seq_file *m, void *v) 341 { 342 int n; 343 344 for(n=0; n<boot_cpu_data.cpu_count; n++) { 345 #ifdef CONFIG_SMP 346 if (0 == cpu_data[n].hpa) 347 continue; 348 #endif 349 seq_printf(m, "processor\t: %d\n" 350 "cpu family\t: PA-RISC %s\n", 351 n, boot_cpu_data.family_name); 352 353 seq_printf(m, "cpu\t\t: %s\n", boot_cpu_data.cpu_name ); 354 355 /* cpu MHz */ 356 seq_printf(m, "cpu MHz\t\t: %d.%06d\n", 357 boot_cpu_data.cpu_hz / 1000000, 358 boot_cpu_data.cpu_hz % 1000000 ); 359 360 seq_printf(m, "model\t\t: %s\n" 361 "model name\t: %s\n", 362 boot_cpu_data.pdc.sys_model_name, 363 cpu_data[n].dev ? 364 cpu_data[n].dev->name : "Unknown" ); 365 366 seq_printf(m, "hversion\t: 0x%08x\n" 367 "sversion\t: 0x%08x\n", 368 boot_cpu_data.hversion, 369 boot_cpu_data.sversion ); 370 371 /* print cachesize info */ 372 show_cache_info(m); 373 374 seq_printf(m, "bogomips\t: %lu.%02lu\n", 375 cpu_data[n].loops_per_jiffy / (500000 / HZ), 376 (cpu_data[n].loops_per_jiffy / (5000 / HZ)) % 100); 377 378 seq_printf(m, "software id\t: %ld\n\n", 379 boot_cpu_data.pdc.model.sw_id); 380 } 381 return 0; 382 } 383 384 static const struct parisc_device_id processor_tbl[] = { 385 { HPHW_NPROC, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, SVERSION_ANY_ID }, 386 { 0, } 387 }; 388 389 static struct parisc_driver cpu_driver = { 390 .name = "CPU", 391 .id_table = processor_tbl, 392 .probe = processor_probe 393 }; 394 395 /** 396 * processor_init - Processor initialization procedure. 397 * 398 * Register this driver. 399 */ 400 void __init processor_init(void) 401 { 402 register_parisc_driver(&cpu_driver); 403 } 404