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/config.h> 30 #include <linux/delay.h> 31 #include <linux/init.h> 32 #include <linux/mm.h> 33 #include <linux/module.h> 34 #include <linux/seq_file.h> 35 #include <linux/slab.h> 36 #include <linux/cpu.h> 37 38 #include <asm/cache.h> 39 #include <asm/hardware.h> /* for register_parisc_driver() stuff */ 40 #include <asm/processor.h> 41 #include <asm/page.h> 42 #include <asm/pdc.h> 43 #include <asm/pdcpat.h> 44 #include <asm/irq.h> /* for struct irq_region */ 45 #include <asm/parisc-device.h> 46 47 struct system_cpuinfo_parisc boot_cpu_data __read_mostly; 48 EXPORT_SYMBOL(boot_cpu_data); 49 50 struct cpuinfo_parisc cpu_data[NR_CPUS] __read_mostly; 51 52 /* 53 ** PARISC CPU driver - claim "device" and initialize CPU data structures. 54 ** 55 ** Consolidate per CPU initialization into (mostly) one module. 56 ** Monarch CPU will initialize boot_cpu_data which shouldn't 57 ** change once the system has booted. 58 ** 59 ** The callback *should* do per-instance initialization of 60 ** everything including the monarch. "Per CPU" init code in 61 ** setup.c:start_parisc() has migrated here and start_parisc() 62 ** will call register_parisc_driver(&cpu_driver) before calling do_inventory(). 63 ** 64 ** The goal of consolidating CPU initialization into one place is 65 ** to make sure all CPU's get initialized the same way. 66 ** The code path not shared is how PDC hands control of the CPU to the OS. 67 ** The initialization of OS data structures is the same (done below). 68 */ 69 70 /** 71 * processor_probe - Determine if processor driver should claim this device. 72 * @dev: The device which has been found. 73 * 74 * Determine if processor driver should claim this chip (return 0) or not 75 * (return 1). If so, initialize the chip and tell other partners in crime 76 * they have work to do. 77 */ 78 static int __init processor_probe(struct parisc_device *dev) 79 { 80 unsigned long txn_addr; 81 unsigned long cpuid; 82 struct cpuinfo_parisc *p; 83 84 #ifndef CONFIG_SMP 85 if (boot_cpu_data.cpu_count > 0) { 86 printk(KERN_INFO "CONFIG_SMP=n ignoring additional CPUs\n"); 87 return 1; 88 } 89 #endif 90 91 /* logical CPU ID and update global counter 92 * May get overwritten by PAT code. 93 */ 94 cpuid = boot_cpu_data.cpu_count; 95 txn_addr = dev->hpa.start; /* for legacy PDC */ 96 97 #ifdef __LP64__ 98 if (is_pdc_pat()) { 99 ulong status; 100 unsigned long bytecnt; 101 pdc_pat_cell_mod_maddr_block_t pa_pdc_cell; 102 #undef USE_PAT_CPUID 103 #ifdef USE_PAT_CPUID 104 struct pdc_pat_cpu_num cpu_info; 105 #endif 106 107 status = pdc_pat_cell_module(&bytecnt, dev->pcell_loc, 108 dev->mod_index, PA_VIEW, &pa_pdc_cell); 109 110 BUG_ON(PDC_OK != status); 111 112 /* verify it's the same as what do_pat_inventory() found */ 113 BUG_ON(dev->mod_info != pa_pdc_cell.mod_info); 114 BUG_ON(dev->pmod_loc != pa_pdc_cell.mod_location); 115 116 txn_addr = pa_pdc_cell.mod[0]; /* id_eid for IO sapic */ 117 118 #ifdef USE_PAT_CPUID 119 /* We need contiguous numbers for cpuid. Firmware's notion 120 * of cpuid is for physical CPUs and we just don't care yet. 121 * We'll care when we need to query PAT PDC about a CPU *after* 122 * boot time (ie shutdown a CPU from an OS perspective). 123 */ 124 /* get the cpu number */ 125 status = pdc_pat_cpu_get_number(&cpu_info, dev->hpa.start); 126 127 BUG_ON(PDC_OK != status); 128 129 if (cpu_info.cpu_num >= NR_CPUS) { 130 printk(KERN_WARNING "IGNORING CPU at 0x%x," 131 " cpu_slot_id > NR_CPUS" 132 " (%ld > %d)\n", 133 dev->hpa.start, cpu_info.cpu_num, NR_CPUS); 134 /* Ignore CPU since it will only crash */ 135 boot_cpu_data.cpu_count--; 136 return 1; 137 } else { 138 cpuid = cpu_info.cpu_num; 139 } 140 #endif 141 } 142 #endif 143 144 p = &cpu_data[cpuid]; 145 boot_cpu_data.cpu_count++; 146 147 /* initialize counters */ 148 memset(p, 0, sizeof(struct cpuinfo_parisc)); 149 150 p->loops_per_jiffy = loops_per_jiffy; 151 p->dev = dev; /* Save IODC data in case we need it */ 152 p->hpa = dev->hpa.start; /* save CPU hpa */ 153 p->cpuid = cpuid; /* save CPU id */ 154 p->txn_addr = txn_addr; /* save CPU IRQ address */ 155 #ifdef CONFIG_SMP 156 spin_lock_init(&p->lock); 157 158 /* 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 CPU's 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 return 0; 204 } 205 206 /** 207 * collect_boot_cpu_data - Fill the boot_cpu_data structure. 208 * 209 * This function collects and stores the generic processor information 210 * in the boot_cpu_data structure. 211 */ 212 void __init collect_boot_cpu_data(void) 213 { 214 memset(&boot_cpu_data, 0, sizeof(boot_cpu_data)); 215 216 boot_cpu_data.cpu_hz = 100 * PAGE0->mem_10msec; /* Hz of this PARISC */ 217 218 /* get CPU-Model Information... */ 219 #define p ((unsigned long *)&boot_cpu_data.pdc.model) 220 if (pdc_model_info(&boot_cpu_data.pdc.model) == PDC_OK) 221 printk(KERN_INFO 222 "model %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n", 223 p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7], p[8]); 224 #undef p 225 226 if (pdc_model_versions(&boot_cpu_data.pdc.versions, 0) == PDC_OK) 227 printk(KERN_INFO "vers %08lx\n", 228 boot_cpu_data.pdc.versions); 229 230 if (pdc_model_cpuid(&boot_cpu_data.pdc.cpuid) == PDC_OK) 231 printk(KERN_INFO "CPUID vers %ld rev %ld (0x%08lx)\n", 232 (boot_cpu_data.pdc.cpuid >> 5) & 127, 233 boot_cpu_data.pdc.cpuid & 31, 234 boot_cpu_data.pdc.cpuid); 235 236 if (pdc_model_capabilities(&boot_cpu_data.pdc.capabilities) == PDC_OK) 237 printk(KERN_INFO "capabilities 0x%lx\n", 238 boot_cpu_data.pdc.capabilities); 239 240 if (pdc_model_sysmodel(boot_cpu_data.pdc.sys_model_name) == PDC_OK) 241 printk(KERN_INFO "model %s\n", 242 boot_cpu_data.pdc.sys_model_name); 243 244 boot_cpu_data.hversion = boot_cpu_data.pdc.model.hversion; 245 boot_cpu_data.sversion = boot_cpu_data.pdc.model.sversion; 246 247 boot_cpu_data.cpu_type = parisc_get_cpu_type(boot_cpu_data.hversion); 248 boot_cpu_data.cpu_name = cpu_name_version[boot_cpu_data.cpu_type][0]; 249 boot_cpu_data.family_name = cpu_name_version[boot_cpu_data.cpu_type][1]; 250 } 251 252 253 /** 254 * init_cpu_profiler - enable/setup per cpu profiling hooks. 255 * @cpunum: The processor instance. 256 * 257 * FIXME: doesn't do much yet... 258 */ 259 static inline void __init 260 init_percpu_prof(int cpunum) 261 { 262 cpu_data[cpunum].prof_counter = 1; 263 cpu_data[cpunum].prof_multiplier = 1; 264 } 265 266 267 /** 268 * init_per_cpu - Handle individual processor initializations. 269 * @cpunum: logical processor number. 270 * 271 * This function handles initialization for *every* CPU 272 * in the system: 273 * 274 * o Set "default" CPU width for trap handlers 275 * 276 * o Enable FP coprocessor 277 * REVISIT: this could be done in the "code 22" trap handler. 278 * (frowands idea - that way we know which processes need FP 279 * registers saved on the interrupt stack.) 280 * NEWS FLASH: wide kernels need FP coprocessor enabled to handle 281 * formatted printing of %lx for example (double divides I think) 282 * 283 * o Enable CPU profiling hooks. 284 */ 285 int __init init_per_cpu(int cpunum) 286 { 287 int ret; 288 struct pdc_coproc_cfg coproc_cfg; 289 290 set_firmware_width(); 291 ret = pdc_coproc_cfg(&coproc_cfg); 292 293 if(ret >= 0 && coproc_cfg.ccr_functional) { 294 mtctl(coproc_cfg.ccr_functional, 10); /* 10 == Coprocessor Control Reg */ 295 296 /* FWIW, FP rev/model is a more accurate way to determine 297 ** CPU type. CPU rev/model has some ambiguous cases. 298 */ 299 cpu_data[cpunum].fp_rev = coproc_cfg.revision; 300 cpu_data[cpunum].fp_model = coproc_cfg.model; 301 302 printk(KERN_INFO "FP[%d] enabled: Rev %ld Model %ld\n", 303 cpunum, coproc_cfg.revision, coproc_cfg.model); 304 305 /* 306 ** store status register to stack (hopefully aligned) 307 ** and clear the T-bit. 308 */ 309 asm volatile ("fstd %fr0,8(%sp)"); 310 311 } else { 312 printk(KERN_WARNING "WARNING: No FP CoProcessor?!" 313 " (coproc_cfg.ccr_functional == 0x%lx, expected 0xc0)\n" 314 #ifdef __LP64__ 315 "Halting Machine - FP required\n" 316 #endif 317 , coproc_cfg.ccr_functional); 318 #ifdef __LP64__ 319 mdelay(100); /* previous chars get pushed to console */ 320 panic("FP CoProc not reported"); 321 #endif 322 } 323 324 /* FUTURE: Enable Performance Monitor : ccr bit 0x20 */ 325 init_percpu_prof(cpunum); 326 327 return ret; 328 } 329 330 /* 331 * Display cpu info for all cpu's. 332 */ 333 int 334 show_cpuinfo (struct seq_file *m, void *v) 335 { 336 int n; 337 338 for(n=0; n<boot_cpu_data.cpu_count; n++) { 339 #ifdef CONFIG_SMP 340 if (0 == cpu_data[n].hpa) 341 continue; 342 #ifdef ENTRY_SYS_CPUS 343 #error iCOD support wants to show CPU state here 344 #endif 345 #endif 346 seq_printf(m, "processor\t: %d\n" 347 "cpu family\t: PA-RISC %s\n", 348 n, boot_cpu_data.family_name); 349 350 seq_printf(m, "cpu\t\t: %s\n", boot_cpu_data.cpu_name ); 351 352 /* cpu MHz */ 353 seq_printf(m, "cpu MHz\t\t: %d.%06d\n", 354 boot_cpu_data.cpu_hz / 1000000, 355 boot_cpu_data.cpu_hz % 1000000 ); 356 357 seq_printf(m, "model\t\t: %s\n" 358 "model name\t: %s\n", 359 boot_cpu_data.pdc.sys_model_name, 360 cpu_data[n].dev ? 361 cpu_data[n].dev->name : "Unknown" ); 362 363 seq_printf(m, "hversion\t: 0x%08x\n" 364 "sversion\t: 0x%08x\n", 365 boot_cpu_data.hversion, 366 boot_cpu_data.sversion ); 367 368 /* print cachesize info */ 369 show_cache_info(m); 370 371 seq_printf(m, "bogomips\t: %lu.%02lu\n", 372 cpu_data[n].loops_per_jiffy / (500000 / HZ), 373 (cpu_data[n].loops_per_jiffy / (5000 / HZ)) % 100); 374 375 seq_printf(m, "software id\t: %ld\n\n", 376 boot_cpu_data.pdc.model.sw_id); 377 } 378 return 0; 379 } 380 381 static struct parisc_device_id processor_tbl[] __read_mostly = { 382 { HPHW_NPROC, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, SVERSION_ANY_ID }, 383 { 0, } 384 }; 385 386 static struct parisc_driver cpu_driver __read_mostly = { 387 .name = "CPU", 388 .id_table = processor_tbl, 389 .probe = processor_probe 390 }; 391 392 /** 393 * processor_init - Processor initalization procedure. 394 * 395 * Register this driver. 396 */ 397 void __init processor_init(void) 398 { 399 register_parisc_driver(&cpu_driver); 400 } 401