1 /* 2 ** I/O Sapic Driver - PCI interrupt line support 3 ** 4 ** (c) Copyright 1999 Grant Grundler 5 ** (c) Copyright 1999 Hewlett-Packard Company 6 ** 7 ** This program is free software; you can redistribute it and/or modify 8 ** it under the terms of the GNU General Public License as published by 9 ** the Free Software Foundation; either version 2 of the License, or 10 ** (at your option) any later version. 11 ** 12 ** The I/O sapic driver manages the Interrupt Redirection Table which is 13 ** the control logic to convert PCI line based interrupts into a Message 14 ** Signaled Interrupt (aka Transaction Based Interrupt, TBI). 15 ** 16 ** Acronyms 17 ** -------- 18 ** HPA Hard Physical Address (aka MMIO address) 19 ** IRQ Interrupt ReQuest. Implies Line based interrupt. 20 ** IRT Interrupt Routing Table (provided by PAT firmware) 21 ** IRdT Interrupt Redirection Table. IRQ line to TXN ADDR/DATA 22 ** table which is implemented in I/O SAPIC. 23 ** ISR Interrupt Service Routine. aka Interrupt handler. 24 ** MSI Message Signaled Interrupt. PCI 2.2 functionality. 25 ** aka Transaction Based Interrupt (or TBI). 26 ** PA Precision Architecture. HP's RISC architecture. 27 ** RISC Reduced Instruction Set Computer. 28 ** 29 ** 30 ** What's a Message Signalled Interrupt? 31 ** ------------------------------------- 32 ** MSI is a write transaction which targets a processor and is similar 33 ** to a processor write to memory or MMIO. MSIs can be generated by I/O 34 ** devices as well as processors and require *architecture* to work. 35 ** 36 ** PA only supports MSI. So I/O subsystems must either natively generate 37 ** MSIs (e.g. GSC or HP-PB) or convert line based interrupts into MSIs 38 ** (e.g. PCI and EISA). IA64 supports MSIs via a "local SAPIC" which 39 ** acts on behalf of a processor. 40 ** 41 ** MSI allows any I/O device to interrupt any processor. This makes 42 ** load balancing of the interrupt processing possible on an SMP platform. 43 ** Interrupts are also ordered WRT to DMA data. It's possible on I/O 44 ** coherent systems to completely eliminate PIO reads from the interrupt 45 ** path. The device and driver must be designed and implemented to 46 ** guarantee all DMA has been issued (issues about atomicity here) 47 ** before the MSI is issued. I/O status can then safely be read from 48 ** DMA'd data by the ISR. 49 ** 50 ** 51 ** PA Firmware 52 ** ----------- 53 ** PA-RISC platforms have two fundamentally different types of firmware. 54 ** For PCI devices, "Legacy" PDC initializes the "INTERRUPT_LINE" register 55 ** and BARs similar to a traditional PC BIOS. 56 ** The newer "PAT" firmware supports PDC calls which return tables. 57 ** PAT firmware only initializes the PCI Console and Boot interface. 58 ** With these tables, the OS can program all other PCI devices. 59 ** 60 ** One such PAT PDC call returns the "Interrupt Routing Table" (IRT). 61 ** The IRT maps each PCI slot's INTA-D "output" line to an I/O SAPIC 62 ** input line. If the IRT is not available, this driver assumes 63 ** INTERRUPT_LINE register has been programmed by firmware. The latter 64 ** case also means online addition of PCI cards can NOT be supported 65 ** even if HW support is present. 66 ** 67 ** All platforms with PAT firmware to date (Oct 1999) use one Interrupt 68 ** Routing Table for the entire platform. 69 ** 70 ** Where's the iosapic? 71 ** -------------------- 72 ** I/O sapic is part of the "Core Electronics Complex". And on HP platforms 73 ** it's integrated as part of the PCI bus adapter, "lba". So no bus walk 74 ** will discover I/O Sapic. I/O Sapic driver learns about each device 75 ** when lba driver advertises the presence of the I/O sapic by calling 76 ** iosapic_register(). 77 ** 78 ** 79 ** IRQ handling notes 80 ** ------------------ 81 ** The IO-SAPIC can indicate to the CPU which interrupt was asserted. 82 ** So, unlike the GSC-ASIC and Dino, we allocate one CPU interrupt per 83 ** IO-SAPIC interrupt and call the device driver's handler directly. 84 ** The IO-SAPIC driver hijacks the CPU interrupt handler so it can 85 ** issue the End Of Interrupt command to the IO-SAPIC. 86 ** 87 ** Overview of exported iosapic functions 88 ** -------------------------------------- 89 ** (caveat: code isn't finished yet - this is just the plan) 90 ** 91 ** iosapic_init: 92 ** o initialize globals (lock, etc) 93 ** o try to read IRT. Presence of IRT determines if this is 94 ** a PAT platform or not. 95 ** 96 ** iosapic_register(): 97 ** o create iosapic_info instance data structure 98 ** o allocate vector_info array for this iosapic 99 ** o initialize vector_info - read corresponding IRdT? 100 ** 101 ** iosapic_xlate_pin: (only called by fixup_irq for PAT platform) 102 ** o intr_pin = read cfg (INTERRUPT_PIN); 103 ** o if (device under PCI-PCI bridge) 104 ** translate slot/pin 105 ** 106 ** iosapic_fixup_irq: 107 ** o if PAT platform (IRT present) 108 ** intr_pin = iosapic_xlate_pin(isi,pcidev): 109 ** intr_line = find IRT entry(isi, PCI_SLOT(pcidev), intr_pin) 110 ** save IRT entry into vector_info later 111 ** write cfg INTERRUPT_LINE (with intr_line)? 112 ** else 113 ** intr_line = pcidev->irq 114 ** IRT pointer = NULL 115 ** endif 116 ** o locate vector_info (needs: isi, intr_line) 117 ** o allocate processor "irq" and get txn_addr/data 118 ** o request_irq(processor_irq, iosapic_interrupt, vector_info,...) 119 ** 120 ** iosapic_enable_irq: 121 ** o clear any pending IRQ on that line 122 ** o enable IRdT - call enable_irq(vector[line]->processor_irq) 123 ** o write EOI in case line is already asserted. 124 ** 125 ** iosapic_disable_irq: 126 ** o disable IRdT - call disable_irq(vector[line]->processor_irq) 127 */ 128 129 130 /* FIXME: determine which include files are really needed */ 131 #include <linux/types.h> 132 #include <linux/kernel.h> 133 #include <linux/spinlock.h> 134 #include <linux/pci.h> 135 #include <linux/init.h> 136 #include <linux/slab.h> 137 #include <linux/interrupt.h> 138 139 #include <asm/byteorder.h> /* get in-line asm for swab */ 140 #include <asm/pdc.h> 141 #include <asm/pdcpat.h> 142 #include <asm/page.h> 143 #include <asm/io.h> /* read/write functions */ 144 #ifdef CONFIG_SUPERIO 145 #include <asm/superio.h> 146 #endif 147 148 #include <asm/ropes.h> 149 #include "iosapic_private.h" 150 151 #define MODULE_NAME "iosapic" 152 153 /* "local" compile flags */ 154 #undef PCI_BRIDGE_FUNCS 155 #undef DEBUG_IOSAPIC 156 #undef DEBUG_IOSAPIC_IRT 157 158 159 #ifdef DEBUG_IOSAPIC 160 #define DBG(x...) printk(x) 161 #else /* DEBUG_IOSAPIC */ 162 #define DBG(x...) 163 #endif /* DEBUG_IOSAPIC */ 164 165 #ifdef DEBUG_IOSAPIC_IRT 166 #define DBG_IRT(x...) printk(x) 167 #else 168 #define DBG_IRT(x...) 169 #endif 170 171 #ifdef CONFIG_64BIT 172 #define COMPARE_IRTE_ADDR(irte, hpa) ((irte)->dest_iosapic_addr == (hpa)) 173 #else 174 #define COMPARE_IRTE_ADDR(irte, hpa) \ 175 ((irte)->dest_iosapic_addr == ((hpa) | 0xffffffff00000000ULL)) 176 #endif 177 178 #define IOSAPIC_REG_SELECT 0x00 179 #define IOSAPIC_REG_WINDOW 0x10 180 #define IOSAPIC_REG_EOI 0x40 181 182 #define IOSAPIC_REG_VERSION 0x1 183 184 #define IOSAPIC_IRDT_ENTRY(idx) (0x10+(idx)*2) 185 #define IOSAPIC_IRDT_ENTRY_HI(idx) (0x11+(idx)*2) 186 187 static inline unsigned int iosapic_read(void __iomem *iosapic, unsigned int reg) 188 { 189 writel(reg, iosapic + IOSAPIC_REG_SELECT); 190 return readl(iosapic + IOSAPIC_REG_WINDOW); 191 } 192 193 static inline void iosapic_write(void __iomem *iosapic, unsigned int reg, u32 val) 194 { 195 writel(reg, iosapic + IOSAPIC_REG_SELECT); 196 writel(val, iosapic + IOSAPIC_REG_WINDOW); 197 } 198 199 #define IOSAPIC_VERSION_MASK 0x000000ff 200 #define IOSAPIC_VERSION(ver) ((int) (ver & IOSAPIC_VERSION_MASK)) 201 202 #define IOSAPIC_MAX_ENTRY_MASK 0x00ff0000 203 #define IOSAPIC_MAX_ENTRY_SHIFT 0x10 204 #define IOSAPIC_IRDT_MAX_ENTRY(ver) \ 205 (int) (((ver) & IOSAPIC_MAX_ENTRY_MASK) >> IOSAPIC_MAX_ENTRY_SHIFT) 206 207 /* bits in the "low" I/O Sapic IRdT entry */ 208 #define IOSAPIC_IRDT_ENABLE 0x10000 209 #define IOSAPIC_IRDT_PO_LOW 0x02000 210 #define IOSAPIC_IRDT_LEVEL_TRIG 0x08000 211 #define IOSAPIC_IRDT_MODE_LPRI 0x00100 212 213 /* bits in the "high" I/O Sapic IRdT entry */ 214 #define IOSAPIC_IRDT_ID_EID_SHIFT 0x10 215 216 217 static DEFINE_SPINLOCK(iosapic_lock); 218 219 static inline void iosapic_eoi(void __iomem *addr, unsigned int data) 220 { 221 __raw_writel(data, addr); 222 } 223 224 /* 225 ** REVISIT: future platforms may have more than one IRT. 226 ** If so, the following three fields form a structure which 227 ** then be linked into a list. Names are chosen to make searching 228 ** for them easy - not necessarily accurate (eg "cell"). 229 ** 230 ** Alternative: iosapic_info could point to the IRT it's in. 231 ** iosapic_register() could search a list of IRT's. 232 */ 233 static struct irt_entry *irt_cell; 234 static size_t irt_num_entry; 235 236 static struct irt_entry *iosapic_alloc_irt(int num_entries) 237 { 238 unsigned long a; 239 240 /* The IRT needs to be 8-byte aligned for the PDC call. 241 * Normally kmalloc would guarantee larger alignment, but 242 * if CONFIG_DEBUG_SLAB is enabled, then we can get only 243 * 4-byte alignment on 32-bit kernels 244 */ 245 a = (unsigned long)kmalloc(sizeof(struct irt_entry) * num_entries + 8, GFP_KERNEL); 246 a = (a + 7UL) & ~7UL; 247 return (struct irt_entry *)a; 248 } 249 250 /** 251 * iosapic_load_irt - Fill in the interrupt routing table 252 * @cell_num: The cell number of the CPU we're currently executing on 253 * @irt: The address to place the new IRT at 254 * @return The number of entries found 255 * 256 * The "Get PCI INT Routing Table Size" option returns the number of 257 * entries in the PCI interrupt routing table for the cell specified 258 * in the cell_number argument. The cell number must be for a cell 259 * within the caller's protection domain. 260 * 261 * The "Get PCI INT Routing Table" option returns, for the cell 262 * specified in the cell_number argument, the PCI interrupt routing 263 * table in the caller allocated memory pointed to by mem_addr. 264 * We assume the IRT only contains entries for I/O SAPIC and 265 * calculate the size based on the size of I/O sapic entries. 266 * 267 * The PCI interrupt routing table entry format is derived from the 268 * IA64 SAL Specification 2.4. The PCI interrupt routing table defines 269 * the routing of PCI interrupt signals between the PCI device output 270 * "pins" and the IO SAPICs' input "lines" (including core I/O PCI 271 * devices). This table does NOT include information for devices/slots 272 * behind PCI to PCI bridges. See PCI to PCI Bridge Architecture Spec. 273 * for the architected method of routing of IRQ's behind PPB's. 274 */ 275 276 277 static int __init 278 iosapic_load_irt(unsigned long cell_num, struct irt_entry **irt) 279 { 280 long status; /* PDC return value status */ 281 struct irt_entry *table; /* start of interrupt routing tbl */ 282 unsigned long num_entries = 0UL; 283 284 BUG_ON(!irt); 285 286 if (is_pdc_pat()) { 287 /* Use pat pdc routine to get interrupt routing table size */ 288 DBG("calling get_irt_size (cell %ld)\n", cell_num); 289 status = pdc_pat_get_irt_size(&num_entries, cell_num); 290 DBG("get_irt_size: %ld\n", status); 291 292 BUG_ON(status != PDC_OK); 293 BUG_ON(num_entries == 0); 294 295 /* 296 ** allocate memory for interrupt routing table 297 ** This interface isn't really right. We are assuming 298 ** the contents of the table are exclusively 299 ** for I/O sapic devices. 300 */ 301 table = iosapic_alloc_irt(num_entries); 302 if (table == NULL) { 303 printk(KERN_WARNING MODULE_NAME ": read_irt : can " 304 "not alloc mem for IRT\n"); 305 return 0; 306 } 307 308 /* get PCI INT routing table */ 309 status = pdc_pat_get_irt(table, cell_num); 310 DBG("pdc_pat_get_irt: %ld\n", status); 311 WARN_ON(status != PDC_OK); 312 } else { 313 /* 314 ** C3000/J5000 (and similar) platforms with Sprockets PDC 315 ** will return exactly one IRT for all iosapics. 316 ** So if we have one, don't need to get it again. 317 */ 318 if (irt_cell) 319 return 0; 320 321 /* Should be using the Elroy's HPA, but it's ignored anyway */ 322 status = pdc_pci_irt_size(&num_entries, 0); 323 DBG("pdc_pci_irt_size: %ld\n", status); 324 325 if (status != PDC_OK) { 326 /* Not a "legacy" system with I/O SAPIC either */ 327 return 0; 328 } 329 330 BUG_ON(num_entries == 0); 331 332 table = iosapic_alloc_irt(num_entries); 333 if (!table) { 334 printk(KERN_WARNING MODULE_NAME ": read_irt : can " 335 "not alloc mem for IRT\n"); 336 return 0; 337 } 338 339 /* HPA ignored by this call too. */ 340 status = pdc_pci_irt(num_entries, 0, table); 341 BUG_ON(status != PDC_OK); 342 } 343 344 /* return interrupt table address */ 345 *irt = table; 346 347 #ifdef DEBUG_IOSAPIC_IRT 348 { 349 struct irt_entry *p = table; 350 int i; 351 352 printk(MODULE_NAME " Interrupt Routing Table (cell %ld)\n", cell_num); 353 printk(MODULE_NAME " start = 0x%p num_entries %ld entry_size %d\n", 354 table, 355 num_entries, 356 (int) sizeof(struct irt_entry)); 357 358 for (i = 0 ; i < num_entries ; i++, p++) { 359 printk(MODULE_NAME " %02x %02x %02x %02x %02x %02x %02x %02x %08x%08x\n", 360 p->entry_type, p->entry_length, p->interrupt_type, 361 p->polarity_trigger, p->src_bus_irq_devno, p->src_bus_id, 362 p->src_seg_id, p->dest_iosapic_intin, 363 ((u32 *) p)[2], 364 ((u32 *) p)[3] 365 ); 366 } 367 } 368 #endif /* DEBUG_IOSAPIC_IRT */ 369 370 return num_entries; 371 } 372 373 374 375 void __init iosapic_init(void) 376 { 377 unsigned long cell = 0; 378 379 DBG("iosapic_init()\n"); 380 381 #ifdef __LP64__ 382 if (is_pdc_pat()) { 383 int status; 384 struct pdc_pat_cell_num cell_info; 385 386 status = pdc_pat_cell_get_number(&cell_info); 387 if (status == PDC_OK) { 388 cell = cell_info.cell_num; 389 } 390 } 391 #endif 392 393 /* get interrupt routing table for this cell */ 394 irt_num_entry = iosapic_load_irt(cell, &irt_cell); 395 if (irt_num_entry == 0) 396 irt_cell = NULL; /* old PDC w/o iosapic */ 397 } 398 399 400 /* 401 ** Return the IRT entry in case we need to look something else up. 402 */ 403 static struct irt_entry * 404 irt_find_irqline(struct iosapic_info *isi, u8 slot, u8 intr_pin) 405 { 406 struct irt_entry *i = irt_cell; 407 int cnt; /* track how many entries we've looked at */ 408 u8 irq_devno = (slot << IRT_DEV_SHIFT) | (intr_pin-1); 409 410 DBG_IRT("irt_find_irqline() SLOT %d pin %d\n", slot, intr_pin); 411 412 for (cnt=0; cnt < irt_num_entry; cnt++, i++) { 413 414 /* 415 ** Validate: entry_type, entry_length, interrupt_type 416 ** 417 ** Difference between validate vs compare is the former 418 ** should print debug info and is not expected to "fail" 419 ** on current platforms. 420 */ 421 if (i->entry_type != IRT_IOSAPIC_TYPE) { 422 DBG_IRT(KERN_WARNING MODULE_NAME ":find_irqline(0x%p): skipping entry %d type %d\n", i, cnt, i->entry_type); 423 continue; 424 } 425 426 if (i->entry_length != IRT_IOSAPIC_LENGTH) { 427 DBG_IRT(KERN_WARNING MODULE_NAME ":find_irqline(0x%p): skipping entry %d length %d\n", i, cnt, i->entry_length); 428 continue; 429 } 430 431 if (i->interrupt_type != IRT_VECTORED_INTR) { 432 DBG_IRT(KERN_WARNING MODULE_NAME ":find_irqline(0x%p): skipping entry %d interrupt_type %d\n", i, cnt, i->interrupt_type); 433 continue; 434 } 435 436 if (!COMPARE_IRTE_ADDR(i, isi->isi_hpa)) 437 continue; 438 439 if ((i->src_bus_irq_devno & IRT_IRQ_DEVNO_MASK) != irq_devno) 440 continue; 441 442 /* 443 ** Ignore: src_bus_id and rc_seg_id correlate with 444 ** iosapic_info->isi_hpa on HP platforms. 445 ** If needed, pass in "PFA" (aka config space addr) 446 ** instead of slot. 447 */ 448 449 /* Found it! */ 450 return i; 451 } 452 453 printk(KERN_WARNING MODULE_NAME ": 0x%lx : no IRT entry for slot %d, pin %d\n", 454 isi->isi_hpa, slot, intr_pin); 455 return NULL; 456 } 457 458 459 /* 460 ** xlate_pin() supports the skewing of IRQ lines done by subsidiary bridges. 461 ** Legacy PDC already does this translation for us and stores it in INTR_LINE. 462 ** 463 ** PAT PDC needs to basically do what legacy PDC does: 464 ** o read PIN 465 ** o adjust PIN in case device is "behind" a PPB 466 ** (eg 4-port 100BT and SCSI/LAN "Combo Card") 467 ** o convert slot/pin to I/O SAPIC input line. 468 ** 469 ** HP platforms only support: 470 ** o one level of skewing for any number of PPBs 471 ** o only support PCI-PCI Bridges. 472 */ 473 static struct irt_entry * 474 iosapic_xlate_pin(struct iosapic_info *isi, struct pci_dev *pcidev) 475 { 476 u8 intr_pin, intr_slot; 477 478 pci_read_config_byte(pcidev, PCI_INTERRUPT_PIN, &intr_pin); 479 480 DBG_IRT("iosapic_xlate_pin(%s) SLOT %d pin %d\n", 481 pcidev->slot_name, PCI_SLOT(pcidev->devfn), intr_pin); 482 483 if (intr_pin == 0) { 484 /* The device does NOT support/use IRQ lines. */ 485 return NULL; 486 } 487 488 /* Check if pcidev behind a PPB */ 489 if (pcidev->bus->parent) { 490 /* Convert pcidev INTR_PIN into something we 491 ** can lookup in the IRT. 492 */ 493 #ifdef PCI_BRIDGE_FUNCS 494 /* 495 ** Proposal #1: 496 ** 497 ** call implementation specific translation function 498 ** This is architecturally "cleaner". HP-UX doesn't 499 ** support other secondary bus types (eg. E/ISA) directly. 500 ** May be needed for other processor (eg IA64) architectures 501 ** or by some ambitous soul who wants to watch TV. 502 */ 503 if (pci_bridge_funcs->xlate_intr_line) { 504 intr_pin = pci_bridge_funcs->xlate_intr_line(pcidev); 505 } 506 #else /* PCI_BRIDGE_FUNCS */ 507 struct pci_bus *p = pcidev->bus; 508 /* 509 ** Proposal #2: 510 ** The "pin" is skewed ((pin + dev - 1) % 4). 511 ** 512 ** This isn't very clean since I/O SAPIC must assume: 513 ** - all platforms only have PCI busses. 514 ** - only PCI-PCI bridge (eg not PCI-EISA, PCI-PCMCIA) 515 ** - IRQ routing is only skewed once regardless of 516 ** the number of PPB's between iosapic and device. 517 ** (Bit3 expansion chassis follows this rule) 518 ** 519 ** Advantage is it's really easy to implement. 520 */ 521 intr_pin = pci_swizzle_interrupt_pin(pcidev, intr_pin); 522 #endif /* PCI_BRIDGE_FUNCS */ 523 524 /* 525 * Locate the host slot of the PPB. 526 */ 527 while (p->parent->parent) 528 p = p->parent; 529 530 intr_slot = PCI_SLOT(p->self->devfn); 531 } else { 532 intr_slot = PCI_SLOT(pcidev->devfn); 533 } 534 DBG_IRT("iosapic_xlate_pin: bus %d slot %d pin %d\n", 535 pcidev->bus->busn_res.start, intr_slot, intr_pin); 536 537 return irt_find_irqline(isi, intr_slot, intr_pin); 538 } 539 540 static void iosapic_rd_irt_entry(struct vector_info *vi , u32 *dp0, u32 *dp1) 541 { 542 struct iosapic_info *isp = vi->iosapic; 543 u8 idx = vi->irqline; 544 545 *dp0 = iosapic_read(isp->addr, IOSAPIC_IRDT_ENTRY(idx)); 546 *dp1 = iosapic_read(isp->addr, IOSAPIC_IRDT_ENTRY_HI(idx)); 547 } 548 549 550 static void iosapic_wr_irt_entry(struct vector_info *vi, u32 dp0, u32 dp1) 551 { 552 struct iosapic_info *isp = vi->iosapic; 553 554 DBG_IRT("iosapic_wr_irt_entry(): irq %d hpa %lx 0x%x 0x%x\n", 555 vi->irqline, isp->isi_hpa, dp0, dp1); 556 557 iosapic_write(isp->addr, IOSAPIC_IRDT_ENTRY(vi->irqline), dp0); 558 559 /* Read the window register to flush the writes down to HW */ 560 dp0 = readl(isp->addr+IOSAPIC_REG_WINDOW); 561 562 iosapic_write(isp->addr, IOSAPIC_IRDT_ENTRY_HI(vi->irqline), dp1); 563 564 /* Read the window register to flush the writes down to HW */ 565 dp1 = readl(isp->addr+IOSAPIC_REG_WINDOW); 566 } 567 568 /* 569 ** set_irt prepares the data (dp0, dp1) according to the vector_info 570 ** and target cpu (id_eid). dp0/dp1 are then used to program I/O SAPIC 571 ** IRdT for the given "vector" (aka IRQ line). 572 */ 573 static void 574 iosapic_set_irt_data( struct vector_info *vi, u32 *dp0, u32 *dp1) 575 { 576 u32 mode = 0; 577 struct irt_entry *p = vi->irte; 578 579 if ((p->polarity_trigger & IRT_PO_MASK) == IRT_ACTIVE_LO) 580 mode |= IOSAPIC_IRDT_PO_LOW; 581 582 if (((p->polarity_trigger >> IRT_EL_SHIFT) & IRT_EL_MASK) == IRT_LEVEL_TRIG) 583 mode |= IOSAPIC_IRDT_LEVEL_TRIG; 584 585 /* 586 ** IA64 REVISIT 587 ** PA doesn't support EXTINT or LPRIO bits. 588 */ 589 590 *dp0 = mode | (u32) vi->txn_data; 591 592 /* 593 ** Extracting id_eid isn't a real clean way of getting it. 594 ** But the encoding is the same for both PA and IA64 platforms. 595 */ 596 if (is_pdc_pat()) { 597 /* 598 ** PAT PDC just hands it to us "right". 599 ** txn_addr comes from cpu_data[x].txn_addr. 600 */ 601 *dp1 = (u32) (vi->txn_addr); 602 } else { 603 /* 604 ** eg if base_addr == 0xfffa0000), 605 ** we want to get 0xa0ff0000. 606 ** 607 ** eid 0x0ff00000 -> 0x00ff0000 608 ** id 0x000ff000 -> 0xff000000 609 */ 610 *dp1 = (((u32)vi->txn_addr & 0x0ff00000) >> 4) | 611 (((u32)vi->txn_addr & 0x000ff000) << 12); 612 } 613 DBG_IRT("iosapic_set_irt_data(): 0x%x 0x%x\n", *dp0, *dp1); 614 } 615 616 617 static void iosapic_mask_irq(struct irq_data *d) 618 { 619 unsigned long flags; 620 struct vector_info *vi = irq_data_get_irq_chip_data(d); 621 u32 d0, d1; 622 623 spin_lock_irqsave(&iosapic_lock, flags); 624 iosapic_rd_irt_entry(vi, &d0, &d1); 625 d0 |= IOSAPIC_IRDT_ENABLE; 626 iosapic_wr_irt_entry(vi, d0, d1); 627 spin_unlock_irqrestore(&iosapic_lock, flags); 628 } 629 630 static void iosapic_unmask_irq(struct irq_data *d) 631 { 632 struct vector_info *vi = irq_data_get_irq_chip_data(d); 633 u32 d0, d1; 634 635 /* data is initialized by fixup_irq */ 636 WARN_ON(vi->txn_irq == 0); 637 638 iosapic_set_irt_data(vi, &d0, &d1); 639 iosapic_wr_irt_entry(vi, d0, d1); 640 641 #ifdef DEBUG_IOSAPIC_IRT 642 { 643 u32 *t = (u32 *) ((ulong) vi->eoi_addr & ~0xffUL); 644 printk("iosapic_enable_irq(): regs %p", vi->eoi_addr); 645 for ( ; t < vi->eoi_addr; t++) 646 printk(" %x", readl(t)); 647 printk("\n"); 648 } 649 650 printk("iosapic_enable_irq(): sel "); 651 { 652 struct iosapic_info *isp = vi->iosapic; 653 654 for (d0=0x10; d0<0x1e; d0++) { 655 d1 = iosapic_read(isp->addr, d0); 656 printk(" %x", d1); 657 } 658 } 659 printk("\n"); 660 #endif 661 662 /* 663 * Issuing I/O SAPIC an EOI causes an interrupt IFF IRQ line is 664 * asserted. IRQ generally should not be asserted when a driver 665 * enables their IRQ. It can lead to "interesting" race conditions 666 * in the driver initialization sequence. 667 */ 668 DBG(KERN_DEBUG "enable_irq(%d): eoi(%p, 0x%x)\n", d->irq, 669 vi->eoi_addr, vi->eoi_data); 670 iosapic_eoi(vi->eoi_addr, vi->eoi_data); 671 } 672 673 static void iosapic_eoi_irq(struct irq_data *d) 674 { 675 struct vector_info *vi = irq_data_get_irq_chip_data(d); 676 677 iosapic_eoi(vi->eoi_addr, vi->eoi_data); 678 cpu_eoi_irq(d); 679 } 680 681 #ifdef CONFIG_SMP 682 static int iosapic_set_affinity_irq(struct irq_data *d, 683 const struct cpumask *dest, bool force) 684 { 685 struct vector_info *vi = irq_data_get_irq_chip_data(d); 686 u32 d0, d1, dummy_d0; 687 unsigned long flags; 688 int dest_cpu; 689 690 dest_cpu = cpu_check_affinity(d, dest); 691 if (dest_cpu < 0) 692 return -1; 693 694 cpumask_copy(irq_data_get_affinity_mask(d), cpumask_of(dest_cpu)); 695 vi->txn_addr = txn_affinity_addr(d->irq, dest_cpu); 696 697 spin_lock_irqsave(&iosapic_lock, flags); 698 /* d1 contains the destination CPU, so only want to set that 699 * entry */ 700 iosapic_rd_irt_entry(vi, &d0, &d1); 701 iosapic_set_irt_data(vi, &dummy_d0, &d1); 702 iosapic_wr_irt_entry(vi, d0, d1); 703 spin_unlock_irqrestore(&iosapic_lock, flags); 704 705 return 0; 706 } 707 #endif 708 709 static struct irq_chip iosapic_interrupt_type = { 710 .name = "IO-SAPIC-level", 711 .irq_unmask = iosapic_unmask_irq, 712 .irq_mask = iosapic_mask_irq, 713 .irq_ack = cpu_ack_irq, 714 .irq_eoi = iosapic_eoi_irq, 715 #ifdef CONFIG_SMP 716 .irq_set_affinity = iosapic_set_affinity_irq, 717 #endif 718 }; 719 720 int iosapic_fixup_irq(void *isi_obj, struct pci_dev *pcidev) 721 { 722 struct iosapic_info *isi = isi_obj; 723 struct irt_entry *irte = NULL; /* only used if PAT PDC */ 724 struct vector_info *vi; 725 int isi_line; /* line used by device */ 726 727 if (!isi) { 728 printk(KERN_WARNING MODULE_NAME ": hpa not registered for %s\n", 729 pci_name(pcidev)); 730 return -1; 731 } 732 733 #ifdef CONFIG_SUPERIO 734 /* 735 * HACK ALERT! (non-compliant PCI device support) 736 * 737 * All SuckyIO interrupts are routed through the PIC's on function 1. 738 * But SuckyIO OHCI USB controller gets an IRT entry anyway because 739 * it advertises INT D for INT_PIN. Use that IRT entry to get the 740 * SuckyIO interrupt routing for PICs on function 1 (*BLEECCHH*). 741 */ 742 if (is_superio_device(pcidev)) { 743 /* We must call superio_fixup_irq() to register the pdev */ 744 pcidev->irq = superio_fixup_irq(pcidev); 745 746 /* Don't return if need to program the IOSAPIC's IRT... */ 747 if (PCI_FUNC(pcidev->devfn) != SUPERIO_USB_FN) 748 return pcidev->irq; 749 } 750 #endif /* CONFIG_SUPERIO */ 751 752 /* lookup IRT entry for isi/slot/pin set */ 753 irte = iosapic_xlate_pin(isi, pcidev); 754 if (!irte) { 755 printk("iosapic: no IRTE for %s (IRQ not connected?)\n", 756 pci_name(pcidev)); 757 return -1; 758 } 759 DBG_IRT("iosapic_fixup_irq(): irte %p %x %x %x %x %x %x %x %x\n", 760 irte, 761 irte->entry_type, 762 irte->entry_length, 763 irte->polarity_trigger, 764 irte->src_bus_irq_devno, 765 irte->src_bus_id, 766 irte->src_seg_id, 767 irte->dest_iosapic_intin, 768 (u32) irte->dest_iosapic_addr); 769 isi_line = irte->dest_iosapic_intin; 770 771 /* get vector info for this input line */ 772 vi = isi->isi_vector + isi_line; 773 DBG_IRT("iosapic_fixup_irq: line %d vi 0x%p\n", isi_line, vi); 774 775 /* If this IRQ line has already been setup, skip it */ 776 if (vi->irte) 777 goto out; 778 779 vi->irte = irte; 780 781 /* 782 * Allocate processor IRQ 783 * 784 * XXX/FIXME The txn_alloc_irq() code and related code should be 785 * moved to enable_irq(). That way we only allocate processor IRQ 786 * bits for devices that actually have drivers claiming them. 787 * Right now we assign an IRQ to every PCI device present, 788 * regardless of whether it's used or not. 789 */ 790 vi->txn_irq = txn_alloc_irq(8); 791 792 if (vi->txn_irq < 0) 793 panic("I/O sapic: couldn't get TXN IRQ\n"); 794 795 /* enable_irq() will use txn_* to program IRdT */ 796 vi->txn_addr = txn_alloc_addr(vi->txn_irq); 797 vi->txn_data = txn_alloc_data(vi->txn_irq); 798 799 vi->eoi_addr = isi->addr + IOSAPIC_REG_EOI; 800 vi->eoi_data = cpu_to_le32(vi->txn_data); 801 802 cpu_claim_irq(vi->txn_irq, &iosapic_interrupt_type, vi); 803 804 out: 805 pcidev->irq = vi->txn_irq; 806 807 DBG_IRT("iosapic_fixup_irq() %d:%d %x %x line %d irq %d\n", 808 PCI_SLOT(pcidev->devfn), PCI_FUNC(pcidev->devfn), 809 pcidev->vendor, pcidev->device, isi_line, pcidev->irq); 810 811 return pcidev->irq; 812 } 813 814 static struct iosapic_info *iosapic_list; 815 816 #ifdef CONFIG_64BIT 817 int iosapic_serial_irq(struct parisc_device *dev) 818 { 819 struct iosapic_info *isi; 820 struct irt_entry *irte; 821 struct vector_info *vi; 822 int cnt; 823 int intin; 824 825 intin = (dev->mod_info >> 24) & 15; 826 827 /* lookup IRT entry for isi/slot/pin set */ 828 for (cnt = 0; cnt < irt_num_entry; cnt++) { 829 irte = &irt_cell[cnt]; 830 if (COMPARE_IRTE_ADDR(irte, dev->mod0) && 831 irte->dest_iosapic_intin == intin) 832 break; 833 } 834 if (cnt >= irt_num_entry) 835 return 0; /* no irq found, force polling */ 836 837 DBG_IRT("iosapic_serial_irq(): irte %p %x %x %x %x %x %x %x %x\n", 838 irte, 839 irte->entry_type, 840 irte->entry_length, 841 irte->polarity_trigger, 842 irte->src_bus_irq_devno, 843 irte->src_bus_id, 844 irte->src_seg_id, 845 irte->dest_iosapic_intin, 846 (u32) irte->dest_iosapic_addr); 847 848 /* search for iosapic */ 849 for (isi = iosapic_list; isi; isi = isi->isi_next) 850 if (isi->isi_hpa == dev->mod0) 851 break; 852 if (!isi) 853 return 0; /* no iosapic found, force polling */ 854 855 /* get vector info for this input line */ 856 vi = isi->isi_vector + intin; 857 DBG_IRT("iosapic_serial_irq: line %d vi 0x%p\n", iosapic_intin, vi); 858 859 /* If this IRQ line has already been setup, skip it */ 860 if (vi->irte) 861 goto out; 862 863 vi->irte = irte; 864 865 /* 866 * Allocate processor IRQ 867 * 868 * XXX/FIXME The txn_alloc_irq() code and related code should be 869 * moved to enable_irq(). That way we only allocate processor IRQ 870 * bits for devices that actually have drivers claiming them. 871 * Right now we assign an IRQ to every PCI device present, 872 * regardless of whether it's used or not. 873 */ 874 vi->txn_irq = txn_alloc_irq(8); 875 876 if (vi->txn_irq < 0) 877 panic("I/O sapic: couldn't get TXN IRQ\n"); 878 879 /* enable_irq() will use txn_* to program IRdT */ 880 vi->txn_addr = txn_alloc_addr(vi->txn_irq); 881 vi->txn_data = txn_alloc_data(vi->txn_irq); 882 883 vi->eoi_addr = isi->addr + IOSAPIC_REG_EOI; 884 vi->eoi_data = cpu_to_le32(vi->txn_data); 885 886 cpu_claim_irq(vi->txn_irq, &iosapic_interrupt_type, vi); 887 888 out: 889 890 return vi->txn_irq; 891 } 892 #endif 893 894 895 /* 896 ** squirrel away the I/O Sapic Version 897 */ 898 static unsigned int 899 iosapic_rd_version(struct iosapic_info *isi) 900 { 901 return iosapic_read(isi->addr, IOSAPIC_REG_VERSION); 902 } 903 904 905 /* 906 ** iosapic_register() is called by "drivers" with an integrated I/O SAPIC. 907 ** Caller must be certain they have an I/O SAPIC and know its MMIO address. 908 ** 909 ** o allocate iosapic_info and add it to the list 910 ** o read iosapic version and squirrel that away 911 ** o read size of IRdT. 912 ** o allocate and initialize isi_vector[] 913 ** o allocate irq region 914 */ 915 void *iosapic_register(unsigned long hpa) 916 { 917 struct iosapic_info *isi = NULL; 918 struct irt_entry *irte = irt_cell; 919 struct vector_info *vip; 920 int cnt; /* track how many entries we've looked at */ 921 922 /* 923 * Astro based platforms can only support PCI OLARD if they implement 924 * PAT PDC. Legacy PDC omits LBAs with no PCI devices from the IRT. 925 * Search the IRT and ignore iosapic's which aren't in the IRT. 926 */ 927 for (cnt=0; cnt < irt_num_entry; cnt++, irte++) { 928 WARN_ON(IRT_IOSAPIC_TYPE != irte->entry_type); 929 if (COMPARE_IRTE_ADDR(irte, hpa)) 930 break; 931 } 932 933 if (cnt >= irt_num_entry) { 934 DBG("iosapic_register() ignoring 0x%lx (NOT FOUND)\n", hpa); 935 return NULL; 936 } 937 938 isi = kzalloc(sizeof(struct iosapic_info), GFP_KERNEL); 939 if (!isi) { 940 BUG(); 941 return NULL; 942 } 943 944 isi->addr = ioremap_nocache(hpa, 4096); 945 isi->isi_hpa = hpa; 946 isi->isi_version = iosapic_rd_version(isi); 947 isi->isi_num_vectors = IOSAPIC_IRDT_MAX_ENTRY(isi->isi_version) + 1; 948 949 vip = isi->isi_vector = kcalloc(isi->isi_num_vectors, 950 sizeof(struct vector_info), GFP_KERNEL); 951 if (vip == NULL) { 952 kfree(isi); 953 return NULL; 954 } 955 956 for (cnt=0; cnt < isi->isi_num_vectors; cnt++, vip++) { 957 vip->irqline = (unsigned char) cnt; 958 vip->iosapic = isi; 959 } 960 isi->isi_next = iosapic_list; 961 iosapic_list = isi; 962 return isi; 963 } 964 965 966 #ifdef DEBUG_IOSAPIC 967 968 static void 969 iosapic_prt_irt(void *irt, long num_entry) 970 { 971 unsigned int i, *irp = (unsigned int *) irt; 972 973 974 printk(KERN_DEBUG MODULE_NAME ": Interrupt Routing Table (%lx entries)\n", num_entry); 975 976 for (i=0; i<num_entry; i++, irp += 4) { 977 printk(KERN_DEBUG "%p : %2d %.8x %.8x %.8x %.8x\n", 978 irp, i, irp[0], irp[1], irp[2], irp[3]); 979 } 980 } 981 982 983 static void 984 iosapic_prt_vi(struct vector_info *vi) 985 { 986 printk(KERN_DEBUG MODULE_NAME ": vector_info[%d] is at %p\n", vi->irqline, vi); 987 printk(KERN_DEBUG "\t\tstatus: %.4x\n", vi->status); 988 printk(KERN_DEBUG "\t\ttxn_irq: %d\n", vi->txn_irq); 989 printk(KERN_DEBUG "\t\ttxn_addr: %lx\n", vi->txn_addr); 990 printk(KERN_DEBUG "\t\ttxn_data: %lx\n", vi->txn_data); 991 printk(KERN_DEBUG "\t\teoi_addr: %p\n", vi->eoi_addr); 992 printk(KERN_DEBUG "\t\teoi_data: %x\n", vi->eoi_data); 993 } 994 995 996 static void 997 iosapic_prt_isi(struct iosapic_info *isi) 998 { 999 printk(KERN_DEBUG MODULE_NAME ": io_sapic_info at %p\n", isi); 1000 printk(KERN_DEBUG "\t\tisi_hpa: %lx\n", isi->isi_hpa); 1001 printk(KERN_DEBUG "\t\tisi_status: %x\n", isi->isi_status); 1002 printk(KERN_DEBUG "\t\tisi_version: %x\n", isi->isi_version); 1003 printk(KERN_DEBUG "\t\tisi_vector: %p\n", isi->isi_vector); 1004 } 1005 #endif /* DEBUG_IOSAPIC */ 1006