1 /* 2 * 64-bit pSeries and RS/6000 setup code. 3 * 4 * Copyright (C) 1995 Linus Torvalds 5 * Adapted from 'alpha' version by Gary Thomas 6 * Modified by Cort Dougan (cort@cs.nmt.edu) 7 * Modified by PPC64 Team, IBM Corp 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 */ 14 15 /* 16 * bootup setup stuff.. 17 */ 18 19 #undef DEBUG 20 21 #include <linux/cpu.h> 22 #include <linux/errno.h> 23 #include <linux/sched.h> 24 #include <linux/kernel.h> 25 #include <linux/mm.h> 26 #include <linux/stddef.h> 27 #include <linux/unistd.h> 28 #include <linux/slab.h> 29 #include <linux/user.h> 30 #include <linux/a.out.h> 31 #include <linux/tty.h> 32 #include <linux/major.h> 33 #include <linux/interrupt.h> 34 #include <linux/reboot.h> 35 #include <linux/init.h> 36 #include <linux/ioport.h> 37 #include <linux/console.h> 38 #include <linux/pci.h> 39 #include <linux/utsname.h> 40 #include <linux/adb.h> 41 #include <linux/module.h> 42 #include <linux/delay.h> 43 #include <linux/irq.h> 44 #include <linux/seq_file.h> 45 #include <linux/root_dev.h> 46 47 #include <asm/mmu.h> 48 #include <asm/processor.h> 49 #include <asm/io.h> 50 #include <asm/pgtable.h> 51 #include <asm/prom.h> 52 #include <asm/rtas.h> 53 #include <asm/pci-bridge.h> 54 #include <asm/iommu.h> 55 #include <asm/dma.h> 56 #include <asm/machdep.h> 57 #include <asm/irq.h> 58 #include <asm/time.h> 59 #include <asm/nvram.h> 60 #include "xics.h" 61 #include <asm/pmc.h> 62 #include <asm/mpic.h> 63 #include <asm/ppc-pci.h> 64 #include <asm/i8259.h> 65 #include <asm/udbg.h> 66 #include <asm/smp.h> 67 #include <asm/firmware.h> 68 69 #include "plpar_wrappers.h" 70 #include "pseries.h" 71 72 #ifdef DEBUG 73 #define DBG(fmt...) udbg_printf(fmt) 74 #else 75 #define DBG(fmt...) 76 #endif 77 78 /* move those away to a .h */ 79 extern void find_udbg_vterm(void); 80 81 int fwnmi_active; /* TRUE if an FWNMI handler is present */ 82 83 static void pseries_shared_idle_sleep(void); 84 static void pseries_dedicated_idle_sleep(void); 85 86 static struct device_node *pSeries_mpic_node; 87 88 static void pSeries_show_cpuinfo(struct seq_file *m) 89 { 90 struct device_node *root; 91 const char *model = ""; 92 93 root = of_find_node_by_path("/"); 94 if (root) 95 model = get_property(root, "model", NULL); 96 seq_printf(m, "machine\t\t: CHRP %s\n", model); 97 of_node_put(root); 98 } 99 100 /* Initialize firmware assisted non-maskable interrupts if 101 * the firmware supports this feature. 102 */ 103 static void __init fwnmi_init(void) 104 { 105 unsigned long system_reset_addr, machine_check_addr; 106 107 int ibm_nmi_register = rtas_token("ibm,nmi-register"); 108 if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE) 109 return; 110 111 /* If the kernel's not linked at zero we point the firmware at low 112 * addresses anyway, and use a trampoline to get to the real code. */ 113 system_reset_addr = __pa(system_reset_fwnmi) - PHYSICAL_START; 114 machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START; 115 116 if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr, 117 machine_check_addr)) 118 fwnmi_active = 1; 119 } 120 121 void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc) 122 { 123 unsigned int cascade_irq = i8259_irq(); 124 if (cascade_irq != NO_IRQ) 125 generic_handle_irq(cascade_irq); 126 desc->chip->eoi(irq); 127 } 128 129 static void __init pseries_mpic_init_IRQ(void) 130 { 131 struct device_node *np, *old, *cascade = NULL; 132 const unsigned int *addrp; 133 unsigned long intack = 0; 134 const unsigned int *opprop; 135 unsigned long openpic_addr = 0; 136 unsigned int cascade_irq; 137 int naddr, n, i, opplen; 138 struct mpic *mpic; 139 140 np = of_find_node_by_path("/"); 141 naddr = prom_n_addr_cells(np); 142 opprop = get_property(np, "platform-open-pic", &opplen); 143 if (opprop != 0) { 144 openpic_addr = of_read_number(opprop, naddr); 145 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr); 146 } 147 of_node_put(np); 148 149 BUG_ON(openpic_addr == 0); 150 151 /* Setup the openpic driver */ 152 mpic = mpic_alloc(pSeries_mpic_node, openpic_addr, 153 MPIC_PRIMARY, 154 16, 250, /* isu size, irq count */ 155 " MPIC "); 156 BUG_ON(mpic == NULL); 157 158 /* Add ISUs */ 159 opplen /= sizeof(u32); 160 for (n = 0, i = naddr; i < opplen; i += naddr, n++) { 161 unsigned long isuaddr = of_read_number(opprop + i, naddr); 162 mpic_assign_isu(mpic, n, isuaddr); 163 } 164 165 /* All ISUs are setup, complete initialization */ 166 mpic_init(mpic); 167 168 /* Look for cascade */ 169 for_each_node_by_type(np, "interrupt-controller") 170 if (device_is_compatible(np, "chrp,iic")) { 171 cascade = np; 172 break; 173 } 174 if (cascade == NULL) 175 return; 176 177 cascade_irq = irq_of_parse_and_map(cascade, 0); 178 if (cascade == NO_IRQ) { 179 printk(KERN_ERR "mpic: failed to map cascade interrupt"); 180 return; 181 } 182 183 /* Check ACK type */ 184 for (old = of_node_get(cascade); old != NULL ; old = np) { 185 np = of_get_parent(old); 186 of_node_put(old); 187 if (np == NULL) 188 break; 189 if (strcmp(np->name, "pci") != 0) 190 continue; 191 addrp = get_property(np, "8259-interrupt-acknowledge", 192 NULL); 193 if (addrp == NULL) 194 continue; 195 naddr = prom_n_addr_cells(np); 196 intack = addrp[naddr-1]; 197 if (naddr > 1) 198 intack |= ((unsigned long)addrp[naddr-2]) << 32; 199 } 200 if (intack) 201 printk(KERN_DEBUG "mpic: PCI 8259 intack at 0x%016lx\n", 202 intack); 203 i8259_init(cascade, intack); 204 of_node_put(cascade); 205 set_irq_chained_handler(cascade_irq, pseries_8259_cascade); 206 } 207 208 static void pseries_lpar_enable_pmcs(void) 209 { 210 unsigned long set, reset; 211 212 set = 1UL << 63; 213 reset = 0; 214 plpar_hcall_norets(H_PERFMON, set, reset); 215 216 /* instruct hypervisor to maintain PMCs */ 217 if (firmware_has_feature(FW_FEATURE_SPLPAR)) 218 get_lppaca()->pmcregs_in_use = 1; 219 } 220 221 static void __init pseries_discover_pic(void) 222 { 223 struct device_node *np; 224 const char *typep; 225 226 for (np = NULL; (np = of_find_node_by_name(np, 227 "interrupt-controller"));) { 228 typep = get_property(np, "compatible", NULL); 229 if (strstr(typep, "open-pic")) { 230 pSeries_mpic_node = of_node_get(np); 231 ppc_md.init_IRQ = pseries_mpic_init_IRQ; 232 ppc_md.get_irq = mpic_get_irq; 233 setup_kexec_cpu_down_mpic(); 234 smp_init_pseries_mpic(); 235 return; 236 } else if (strstr(typep, "ppc-xicp")) { 237 ppc_md.init_IRQ = xics_init_IRQ; 238 setup_kexec_cpu_down_xics(); 239 smp_init_pseries_xics(); 240 return; 241 } 242 } 243 printk(KERN_ERR "pSeries_discover_pic: failed to recognize" 244 " interrupt-controller\n"); 245 } 246 247 static void __init pSeries_setup_arch(void) 248 { 249 /* Discover PIC type and setup ppc_md accordingly */ 250 pseries_discover_pic(); 251 252 /* openpic global configuration register (64-bit format). */ 253 /* openpic Interrupt Source Unit pointer (64-bit format). */ 254 /* python0 facility area (mmio) (64-bit format) REAL address. */ 255 256 /* init to some ~sane value until calibrate_delay() runs */ 257 loops_per_jiffy = 50000000; 258 259 if (ROOT_DEV == 0) { 260 printk("No ramdisk, default root is /dev/sda2\n"); 261 ROOT_DEV = Root_SDA2; 262 } 263 264 fwnmi_init(); 265 266 /* Find and initialize PCI host bridges */ 267 init_pci_config_tokens(); 268 find_and_init_phbs(); 269 eeh_init(); 270 271 pSeries_nvram_init(); 272 273 /* Choose an idle loop */ 274 if (firmware_has_feature(FW_FEATURE_SPLPAR)) { 275 vpa_init(boot_cpuid); 276 if (get_lppaca()->shared_proc) { 277 printk(KERN_DEBUG "Using shared processor idle loop\n"); 278 ppc_md.power_save = pseries_shared_idle_sleep; 279 } else { 280 printk(KERN_DEBUG "Using dedicated idle loop\n"); 281 ppc_md.power_save = pseries_dedicated_idle_sleep; 282 } 283 } else { 284 printk(KERN_DEBUG "Using default idle loop\n"); 285 } 286 287 if (firmware_has_feature(FW_FEATURE_LPAR)) 288 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs; 289 else 290 ppc_md.enable_pmcs = power4_enable_pmcs; 291 } 292 293 static int __init pSeries_init_panel(void) 294 { 295 /* Manually leave the kernel version on the panel. */ 296 ppc_md.progress("Linux ppc64\n", 0); 297 ppc_md.progress(init_utsname()->version, 0); 298 299 return 0; 300 } 301 arch_initcall(pSeries_init_panel); 302 303 static int pseries_set_dabr(unsigned long dabr) 304 { 305 return plpar_hcall_norets(H_SET_DABR, dabr); 306 } 307 308 static int pseries_set_xdabr(unsigned long dabr) 309 { 310 /* We want to catch accesses from kernel and userspace */ 311 return plpar_hcall_norets(H_SET_XDABR, dabr, 312 H_DABRX_KERNEL | H_DABRX_USER); 313 } 314 315 /* 316 * Early initialization. Relocation is on but do not reference unbolted pages 317 */ 318 static void __init pSeries_init_early(void) 319 { 320 DBG(" -> pSeries_init_early()\n"); 321 322 fw_feature_init(); 323 324 if (firmware_has_feature(FW_FEATURE_LPAR)) 325 find_udbg_vterm(); 326 327 if (firmware_has_feature(FW_FEATURE_DABR)) 328 ppc_md.set_dabr = pseries_set_dabr; 329 else if (firmware_has_feature(FW_FEATURE_XDABR)) 330 ppc_md.set_dabr = pseries_set_xdabr; 331 332 iommu_init_early_pSeries(); 333 334 DBG(" <- pSeries_init_early()\n"); 335 } 336 337 338 static int pSeries_check_legacy_ioport(unsigned int baseport) 339 { 340 struct device_node *np; 341 342 #define I8042_DATA_REG 0x60 343 #define FDC_BASE 0x3f0 344 345 346 switch(baseport) { 347 case I8042_DATA_REG: 348 np = of_find_node_by_type(NULL, "8042"); 349 if (np == NULL) 350 return -ENODEV; 351 of_node_put(np); 352 break; 353 case FDC_BASE: 354 np = of_find_node_by_type(NULL, "fdc"); 355 if (np == NULL) 356 return -ENODEV; 357 of_node_put(np); 358 break; 359 } 360 return 0; 361 } 362 363 /* 364 * Called very early, MMU is off, device-tree isn't unflattened 365 */ 366 367 static int __init pSeries_probe_hypertas(unsigned long node, 368 const char *uname, int depth, 369 void *data) 370 { 371 if (depth != 1 || 372 (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0)) 373 return 0; 374 375 if (of_get_flat_dt_prop(node, "ibm,hypertas-functions", NULL) != NULL) 376 powerpc_firmware_features |= FW_FEATURE_LPAR; 377 378 return 1; 379 } 380 381 static int __init pSeries_probe(void) 382 { 383 unsigned long root = of_get_flat_dt_root(); 384 char *dtype = of_get_flat_dt_prop(root, "device_type", NULL); 385 386 if (dtype == NULL) 387 return 0; 388 if (strcmp(dtype, "chrp")) 389 return 0; 390 391 /* Cell blades firmware claims to be chrp while it's not. Until this 392 * is fixed, we need to avoid those here. 393 */ 394 if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") || 395 of_flat_dt_is_compatible(root, "IBM,CBEA")) 396 return 0; 397 398 DBG("pSeries detected, looking for LPAR capability...\n"); 399 400 /* Now try to figure out if we are running on LPAR */ 401 of_scan_flat_dt(pSeries_probe_hypertas, NULL); 402 403 if (firmware_has_feature(FW_FEATURE_LPAR)) 404 hpte_init_lpar(); 405 else 406 hpte_init_native(); 407 408 DBG("Machine is%s LPAR !\n", 409 (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not"); 410 411 return 1; 412 } 413 414 415 DECLARE_PER_CPU(unsigned long, smt_snooze_delay); 416 417 static void pseries_dedicated_idle_sleep(void) 418 { 419 unsigned int cpu = smp_processor_id(); 420 unsigned long start_snooze; 421 422 /* 423 * Indicate to the HV that we are idle. Now would be 424 * a good time to find other work to dispatch. 425 */ 426 get_lppaca()->idle = 1; 427 428 /* 429 * We come in with interrupts disabled, and need_resched() 430 * has been checked recently. If we should poll for a little 431 * while, do so. 432 */ 433 if (__get_cpu_var(smt_snooze_delay)) { 434 start_snooze = get_tb() + 435 __get_cpu_var(smt_snooze_delay) * tb_ticks_per_usec; 436 local_irq_enable(); 437 set_thread_flag(TIF_POLLING_NRFLAG); 438 439 while (get_tb() < start_snooze) { 440 if (need_resched() || cpu_is_offline(cpu)) 441 goto out; 442 ppc64_runlatch_off(); 443 HMT_low(); 444 HMT_very_low(); 445 } 446 447 HMT_medium(); 448 clear_thread_flag(TIF_POLLING_NRFLAG); 449 smp_mb(); 450 local_irq_disable(); 451 if (need_resched() || cpu_is_offline(cpu)) 452 goto out; 453 } 454 455 cede_processor(); 456 457 out: 458 HMT_medium(); 459 get_lppaca()->idle = 0; 460 } 461 462 static void pseries_shared_idle_sleep(void) 463 { 464 /* 465 * Indicate to the HV that we are idle. Now would be 466 * a good time to find other work to dispatch. 467 */ 468 get_lppaca()->idle = 1; 469 470 /* 471 * Yield the processor to the hypervisor. We return if 472 * an external interrupt occurs (which are driven prior 473 * to returning here) or if a prod occurs from another 474 * processor. When returning here, external interrupts 475 * are enabled. 476 */ 477 cede_processor(); 478 479 get_lppaca()->idle = 0; 480 } 481 482 static int pSeries_pci_probe_mode(struct pci_bus *bus) 483 { 484 if (firmware_has_feature(FW_FEATURE_LPAR)) 485 return PCI_PROBE_DEVTREE; 486 return PCI_PROBE_NORMAL; 487 } 488 489 /** 490 * pSeries_power_off - tell firmware about how to power off the system. 491 * 492 * This function calls either the power-off rtas token in normal cases 493 * or the ibm,power-off-ups token (if present & requested) in case of 494 * a power failure. If power-off token is used, power on will only be 495 * possible with power button press. If ibm,power-off-ups token is used 496 * it will allow auto poweron after power is restored. 497 */ 498 void pSeries_power_off(void) 499 { 500 int rc; 501 int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups"); 502 503 if (rtas_flash_term_hook) 504 rtas_flash_term_hook(SYS_POWER_OFF); 505 506 if (rtas_poweron_auto == 0 || 507 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) { 508 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1); 509 printk(KERN_INFO "RTAS power-off returned %d\n", rc); 510 } else { 511 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL); 512 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc); 513 } 514 for (;;); 515 } 516 517 define_machine(pseries) { 518 .name = "pSeries", 519 .probe = pSeries_probe, 520 .setup_arch = pSeries_setup_arch, 521 .init_early = pSeries_init_early, 522 .show_cpuinfo = pSeries_show_cpuinfo, 523 .log_error = pSeries_log_error, 524 .pcibios_fixup = pSeries_final_fixup, 525 .pci_probe_mode = pSeries_pci_probe_mode, 526 .restart = rtas_restart, 527 .power_off = pSeries_power_off, 528 .halt = rtas_halt, 529 .panic = rtas_os_term, 530 .get_boot_time = rtas_get_boot_time, 531 .get_rtc_time = rtas_get_rtc_time, 532 .set_rtc_time = rtas_set_rtc_time, 533 .calibrate_decr = generic_calibrate_decr, 534 .progress = rtas_progress, 535 .check_legacy_ioport = pSeries_check_legacy_ioport, 536 .system_reset_exception = pSeries_system_reset_exception, 537 .machine_check_exception = pSeries_machine_check_exception, 538 }; 539