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 <[email protected]> 7 * Modifications copyright 1999 SuSE GmbH (Philipp Rumpf) 8 * Modifications copyright 2000 Martin K. Petersen <[email protected]> 9 * Modifications copyright 2000 Philipp Rumpf <[email protected]> 10 * Modifications copyright 2001 Ryan Bradetich <[email protected]> 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 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 /* 52 ** PARISC CPU driver - claim "device" and initialize CPU data structures. 53 ** 54 ** Consolidate per CPU initialization into (mostly) one module. 55 ** Monarch CPU will initialize boot_cpu_data which shouldn't 56 ** change once the system has booted. 57 ** 58 ** The callback *should* do per-instance initialization of 59 ** everything including the monarch. "Per CPU" init code in 60 ** setup.c:start_parisc() has migrated here and start_parisc() 61 ** will call register_parisc_driver(&cpu_driver) before calling do_inventory(). 62 ** 63 ** The goal of consolidating CPU initialization into one place is 64 ** to make sure all CPU's get initialized the same way. 65 ** The code path not shared is how PDC hands control of the CPU to the OS. 66 ** The initialization of OS data structures is the same (done below). 67 */ 68 69 /** 70 * processor_probe - Determine if processor driver should claim this device. 71 * @dev: The device which has been found. 72 * 73 * Determine if processor driver should claim this chip (return 0) or not 74 * (return 1). If so, initialize the chip and tell other partners in crime 75 * they have work to do. 76 */ 77 static int __init processor_probe(struct parisc_device *dev) 78 { 79 unsigned long txn_addr; 80 unsigned long cpuid; 81 struct cpuinfo_parisc *p; 82 83 #ifndef CONFIG_SMP 84 if (boot_cpu_data.cpu_count > 0) { 85 printk(KERN_INFO "CONFIG_SMP=n ignoring additional CPUs\n"); 86 return 1; 87 } 88 #endif 89 90 /* logical CPU ID and update global counter 91 * May get overwritten by PAT code. 92 */ 93 cpuid = boot_cpu_data.cpu_count; 94 txn_addr = dev->hpa.start; /* for legacy PDC */ 95 96 #ifdef __LP64__ 97 if (is_pdc_pat()) { 98 ulong status; 99 unsigned long bytecnt; 100 pdc_pat_cell_mod_maddr_block_t pa_pdc_cell; 101 #undef USE_PAT_CPUID 102 #ifdef USE_PAT_CPUID 103 struct pdc_pat_cpu_num cpu_info; 104 #endif 105 106 status = pdc_pat_cell_module(&bytecnt, dev->pcell_loc, 107 dev->mod_index, PA_VIEW, &pa_pdc_cell); 108 109 BUG_ON(PDC_OK != status); 110 111 /* verify it's the same as what do_pat_inventory() found */ 112 BUG_ON(dev->mod_info != pa_pdc_cell.mod_info); 113 BUG_ON(dev->pmod_loc != pa_pdc_cell.mod_location); 114 115 txn_addr = pa_pdc_cell.mod[0]; /* id_eid for IO sapic */ 116 117 #ifdef USE_PAT_CPUID 118 /* We need contiguous numbers for cpuid. Firmware's notion 119 * of cpuid is for physical CPUs and we just don't care yet. 120 * We'll care when we need to query PAT PDC about a CPU *after* 121 * boot time (ie shutdown a CPU from an OS perspective). 122 */ 123 /* get the cpu number */ 124 status = pdc_pat_cpu_get_number(&cpu_info, dev->hpa.start); 125 126 BUG_ON(PDC_OK != status); 127 128 if (cpu_info.cpu_num >= NR_CPUS) { 129 printk(KERN_WARNING "IGNORING CPU at 0x%x," 130 " cpu_slot_id > NR_CPUS" 131 " (%ld > %d)\n", 132 dev->hpa.start, cpu_info.cpu_num, NR_CPUS); 133 /* Ignore CPU since it will only crash */ 134 boot_cpu_data.cpu_count--; 135 return 1; 136 } else { 137 cpuid = cpu_info.cpu_num; 138 } 139 #endif 140 } 141 #endif 142 143 p = &cpu_data[cpuid]; 144 boot_cpu_data.cpu_count++; 145 146 /* initialize counters */ 147 memset(p, 0, sizeof(struct cpuinfo_parisc)); 148 149 p->loops_per_jiffy = loops_per_jiffy; 150 p->dev = dev; /* Save IODC data in case we need it */ 151 p->hpa = dev->hpa.start; /* save CPU hpa */ 152 p->cpuid = cpuid; /* save CPU id */ 153 p->txn_addr = txn_addr; /* save CPU IRQ address */ 154 #ifdef CONFIG_SMP 155 spin_lock_init(&p->lock); 156 157 /* 158 ** FIXME: review if any other initialization is clobbered 159 ** for boot_cpu by the above memset(). 160 */ 161 162 /* stolen from init_percpu_prof() */ 163 cpu_data[cpuid].prof_counter = 1; 164 cpu_data[cpuid].prof_multiplier = 1; 165 #endif 166 167 /* 168 ** CONFIG_SMP: init_smp_config() will attempt to get CPU's into 169 ** OS control. RENDEZVOUS is the default state - see mem_set above. 170 ** p->state = STATE_RENDEZVOUS; 171 */ 172 173 #if 0 174 /* CPU 0 IRQ table is statically allocated/initialized */ 175 if (cpuid) { 176 struct irqaction actions[]; 177 178 /* 179 ** itimer and ipi IRQ handlers are statically initialized in 180 ** arch/parisc/kernel/irq.c. ie Don't need to register them. 181 */ 182 actions = kmalloc(sizeof(struct irqaction)*MAX_CPU_IRQ, GFP_ATOMIC); 183 if (!actions) { 184 /* not getting it's own table, share with monarch */ 185 actions = cpu_irq_actions[0]; 186 } 187 188 cpu_irq_actions[cpuid] = actions; 189 } 190 #endif 191 192 /* 193 * Bring this CPU up now! (ignore bootstrap cpuid == 0) 194 */ 195 #ifdef CONFIG_SMP 196 if (cpuid) { 197 cpu_set(cpuid, cpu_present_map); 198 cpu_up(cpuid); 199 } 200 #endif 201 202 return 0; 203 } 204 205 /** 206 * collect_boot_cpu_data - Fill the boot_cpu_data structure. 207 * 208 * This function collects and stores the generic processor information 209 * in the boot_cpu_data structure. 210 */ 211 void __init collect_boot_cpu_data(void) 212 { 213 memset(&boot_cpu_data, 0, sizeof(boot_cpu_data)); 214 215 boot_cpu_data.cpu_hz = 100 * PAGE0->mem_10msec; /* Hz of this PARISC */ 216 217 /* get CPU-Model Information... */ 218 #define p ((unsigned long *)&boot_cpu_data.pdc.model) 219 if (pdc_model_info(&boot_cpu_data.pdc.model) == PDC_OK) 220 printk(KERN_INFO 221 "model %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n", 222 p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7], p[8]); 223 #undef p 224 225 if (pdc_model_versions(&boot_cpu_data.pdc.versions, 0) == PDC_OK) 226 printk(KERN_INFO "vers %08lx\n", 227 boot_cpu_data.pdc.versions); 228 229 if (pdc_model_cpuid(&boot_cpu_data.pdc.cpuid) == PDC_OK) 230 printk(KERN_INFO "CPUID vers %ld rev %ld (0x%08lx)\n", 231 (boot_cpu_data.pdc.cpuid >> 5) & 127, 232 boot_cpu_data.pdc.cpuid & 31, 233 boot_cpu_data.pdc.cpuid); 234 235 if (pdc_model_capabilities(&boot_cpu_data.pdc.capabilities) == PDC_OK) 236 printk(KERN_INFO "capabilities 0x%lx\n", 237 boot_cpu_data.pdc.capabilities); 238 239 if (pdc_model_sysmodel(boot_cpu_data.pdc.sys_model_name) == PDC_OK) 240 printk(KERN_INFO "model %s\n", 241 boot_cpu_data.pdc.sys_model_name); 242 243 boot_cpu_data.hversion = boot_cpu_data.pdc.model.hversion; 244 boot_cpu_data.sversion = boot_cpu_data.pdc.model.sversion; 245 246 boot_cpu_data.cpu_type = parisc_get_cpu_type(boot_cpu_data.hversion); 247 boot_cpu_data.cpu_name = cpu_name_version[boot_cpu_data.cpu_type][0]; 248 boot_cpu_data.family_name = cpu_name_version[boot_cpu_data.cpu_type][1]; 249 } 250 251 252 /** 253 * init_cpu_profiler - enable/setup per cpu profiling hooks. 254 * @cpunum: The processor instance. 255 * 256 * FIXME: doesn't do much yet... 257 */ 258 static inline void __init 259 init_percpu_prof(int cpunum) 260 { 261 cpu_data[cpunum].prof_counter = 1; 262 cpu_data[cpunum].prof_multiplier = 1; 263 } 264 265 266 /** 267 * init_per_cpu - Handle individual processor initializations. 268 * @cpunum: logical processor number. 269 * 270 * This function handles initialization for *every* CPU 271 * in the system: 272 * 273 * o Set "default" CPU width for trap handlers 274 * 275 * o Enable FP coprocessor 276 * REVISIT: this could be done in the "code 22" trap handler. 277 * (frowands idea - that way we know which processes need FP 278 * registers saved on the interrupt stack.) 279 * NEWS FLASH: wide kernels need FP coprocessor enabled to handle 280 * formatted printing of %lx for example (double divides I think) 281 * 282 * o Enable CPU profiling hooks. 283 */ 284 int __init init_per_cpu(int cpunum) 285 { 286 int ret; 287 struct pdc_coproc_cfg coproc_cfg; 288 289 set_firmware_width(); 290 ret = pdc_coproc_cfg(&coproc_cfg); 291 292 if(ret >= 0 && coproc_cfg.ccr_functional) { 293 mtctl(coproc_cfg.ccr_functional, 10); /* 10 == Coprocessor Control Reg */ 294 295 /* FWIW, FP rev/model is a more accurate way to determine 296 ** CPU type. CPU rev/model has some ambiguous cases. 297 */ 298 cpu_data[cpunum].fp_rev = coproc_cfg.revision; 299 cpu_data[cpunum].fp_model = coproc_cfg.model; 300 301 printk(KERN_INFO "FP[%d] enabled: Rev %ld Model %ld\n", 302 cpunum, coproc_cfg.revision, coproc_cfg.model); 303 304 /* 305 ** store status register to stack (hopefully aligned) 306 ** and clear the T-bit. 307 */ 308 asm volatile ("fstd %fr0,8(%sp)"); 309 310 } else { 311 printk(KERN_WARNING "WARNING: No FP CoProcessor?!" 312 " (coproc_cfg.ccr_functional == 0x%lx, expected 0xc0)\n" 313 #ifdef __LP64__ 314 "Halting Machine - FP required\n" 315 #endif 316 , coproc_cfg.ccr_functional); 317 #ifdef __LP64__ 318 mdelay(100); /* previous chars get pushed to console */ 319 panic("FP CoProc not reported"); 320 #endif 321 } 322 323 /* FUTURE: Enable Performance Monitor : ccr bit 0x20 */ 324 init_percpu_prof(cpunum); 325 326 return ret; 327 } 328 329 /* 330 * Display cpu info for all cpu's. 331 */ 332 int 333 show_cpuinfo (struct seq_file *m, void *v) 334 { 335 int n; 336 337 for(n=0; n<boot_cpu_data.cpu_count; n++) { 338 #ifdef CONFIG_SMP 339 if (0 == cpu_data[n].hpa) 340 continue; 341 #ifdef ENTRY_SYS_CPUS 342 #error iCOD support wants to show CPU state here 343 #endif 344 #endif 345 seq_printf(m, "processor\t: %d\n" 346 "cpu family\t: PA-RISC %s\n", 347 n, boot_cpu_data.family_name); 348 349 seq_printf(m, "cpu\t\t: %s\n", boot_cpu_data.cpu_name ); 350 351 /* cpu MHz */ 352 seq_printf(m, "cpu MHz\t\t: %d.%06d\n", 353 boot_cpu_data.cpu_hz / 1000000, 354 boot_cpu_data.cpu_hz % 1000000 ); 355 356 seq_printf(m, "model\t\t: %s\n" 357 "model name\t: %s\n", 358 boot_cpu_data.pdc.sys_model_name, 359 cpu_data[n].dev ? 360 cpu_data[n].dev->name : "Unknown" ); 361 362 seq_printf(m, "hversion\t: 0x%08x\n" 363 "sversion\t: 0x%08x\n", 364 boot_cpu_data.hversion, 365 boot_cpu_data.sversion ); 366 367 /* print cachesize info */ 368 show_cache_info(m); 369 370 seq_printf(m, "bogomips\t: %lu.%02lu\n", 371 cpu_data[n].loops_per_jiffy / (500000 / HZ), 372 (cpu_data[n].loops_per_jiffy / (5000 / HZ)) % 100); 373 374 seq_printf(m, "software id\t: %ld\n\n", 375 boot_cpu_data.pdc.model.sw_id); 376 } 377 return 0; 378 } 379 380 static struct parisc_device_id processor_tbl[] __read_mostly = { 381 { HPHW_NPROC, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, SVERSION_ANY_ID }, 382 { 0, } 383 }; 384 385 static struct parisc_driver cpu_driver __read_mostly = { 386 .name = "CPU", 387 .id_table = processor_tbl, 388 .probe = processor_probe 389 }; 390 391 /** 392 * processor_init - Processor initalization procedure. 393 * 394 * Register this driver. 395 */ 396 void __init processor_init(void) 397 { 398 register_parisc_driver(&cpu_driver); 399 } 400