Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 fundementally 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 PCI Console and Boot interface. |
| 58 | ** With these tables, the OS can progam 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/system.h> |
| 144 | #include <asm/io.h> /* read/write functions */ |
| 145 | #ifdef CONFIG_SUPERIO |
| 146 | #include <asm/superio.h> |
| 147 | #endif |
| 148 | |
| 149 | #include <asm/iosapic.h> |
| 150 | #include "./iosapic_private.h" |
| 151 | |
| 152 | #define MODULE_NAME "iosapic" |
| 153 | |
| 154 | /* "local" compile flags */ |
| 155 | #undef PCI_BRIDGE_FUNCS |
| 156 | #undef DEBUG_IOSAPIC |
| 157 | #undef DEBUG_IOSAPIC_IRT |
| 158 | |
| 159 | |
| 160 | #ifdef DEBUG_IOSAPIC |
| 161 | #define DBG(x...) printk(x) |
| 162 | #else /* DEBUG_IOSAPIC */ |
| 163 | #define DBG(x...) |
| 164 | #endif /* DEBUG_IOSAPIC */ |
| 165 | |
| 166 | #ifdef DEBUG_IOSAPIC_IRT |
| 167 | #define DBG_IRT(x...) printk(x) |
| 168 | #else |
| 169 | #define DBG_IRT(x...) |
| 170 | #endif |
| 171 | |
| 172 | #ifdef CONFIG_64BIT |
| 173 | #define COMPARE_IRTE_ADDR(irte, hpa) ((irte)->dest_iosapic_addr == (hpa)) |
| 174 | #else |
| 175 | #define COMPARE_IRTE_ADDR(irte, hpa) \ |
| 176 | ((irte)->dest_iosapic_addr == ((hpa) | 0xffffffff00000000ULL)) |
| 177 | #endif |
| 178 | |
| 179 | #define IOSAPIC_REG_SELECT 0x00 |
| 180 | #define IOSAPIC_REG_WINDOW 0x10 |
| 181 | #define IOSAPIC_REG_EOI 0x40 |
| 182 | |
| 183 | #define IOSAPIC_REG_VERSION 0x1 |
| 184 | |
| 185 | #define IOSAPIC_IRDT_ENTRY(idx) (0x10+(idx)*2) |
| 186 | #define IOSAPIC_IRDT_ENTRY_HI(idx) (0x11+(idx)*2) |
| 187 | |
| 188 | static inline unsigned int iosapic_read(void __iomem *iosapic, unsigned int reg) |
| 189 | { |
| 190 | writel(reg, iosapic + IOSAPIC_REG_SELECT); |
| 191 | return readl(iosapic + IOSAPIC_REG_WINDOW); |
| 192 | } |
| 193 | |
| 194 | static inline void iosapic_write(void __iomem *iosapic, unsigned int reg, u32 val) |
| 195 | { |
| 196 | writel(reg, iosapic + IOSAPIC_REG_SELECT); |
| 197 | writel(val, iosapic + IOSAPIC_REG_WINDOW); |
| 198 | } |
| 199 | |
| 200 | #define IOSAPIC_VERSION_MASK 0x000000ff |
| 201 | #define IOSAPIC_VERSION(ver) ((int) (ver & IOSAPIC_VERSION_MASK)) |
| 202 | |
| 203 | #define IOSAPIC_MAX_ENTRY_MASK 0x00ff0000 |
| 204 | #define IOSAPIC_MAX_ENTRY_SHIFT 0x10 |
| 205 | #define IOSAPIC_IRDT_MAX_ENTRY(ver) \ |
| 206 | (int) (((ver) & IOSAPIC_MAX_ENTRY_MASK) >> IOSAPIC_MAX_ENTRY_SHIFT) |
| 207 | |
| 208 | /* bits in the "low" I/O Sapic IRdT entry */ |
| 209 | #define IOSAPIC_IRDT_ENABLE 0x10000 |
| 210 | #define IOSAPIC_IRDT_PO_LOW 0x02000 |
| 211 | #define IOSAPIC_IRDT_LEVEL_TRIG 0x08000 |
| 212 | #define IOSAPIC_IRDT_MODE_LPRI 0x00100 |
| 213 | |
| 214 | /* bits in the "high" I/O Sapic IRdT entry */ |
| 215 | #define IOSAPIC_IRDT_ID_EID_SHIFT 0x10 |
| 216 | |
| 217 | |
Ingo Molnar | a9f6a0d | 2005-09-09 13:10:41 -0700 | [diff] [blame] | 218 | static DEFINE_SPINLOCK(iosapic_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | |
| 220 | static inline void iosapic_eoi(void __iomem *addr, unsigned int data) |
| 221 | { |
| 222 | __raw_writel(data, addr); |
| 223 | } |
| 224 | |
| 225 | /* |
| 226 | ** REVISIT: future platforms may have more than one IRT. |
| 227 | ** If so, the following three fields form a structure which |
| 228 | ** then be linked into a list. Names are chosen to make searching |
| 229 | ** for them easy - not necessarily accurate (eg "cell"). |
| 230 | ** |
| 231 | ** Alternative: iosapic_info could point to the IRT it's in. |
| 232 | ** iosapic_register() could search a list of IRT's. |
| 233 | */ |
| 234 | static struct irt_entry *irt_cell; |
| 235 | static size_t irt_num_entry; |
| 236 | |
| 237 | static struct irt_entry *iosapic_alloc_irt(int num_entries) |
| 238 | { |
| 239 | unsigned long a; |
| 240 | |
| 241 | /* The IRT needs to be 8-byte aligned for the PDC call. |
| 242 | * Normally kmalloc would guarantee larger alignment, but |
| 243 | * if CONFIG_DEBUG_SLAB is enabled, then we can get only |
| 244 | * 4-byte alignment on 32-bit kernels |
| 245 | */ |
| 246 | a = (unsigned long)kmalloc(sizeof(struct irt_entry) * num_entries + 8, GFP_KERNEL); |
| 247 | a = (a + 7) & ~7; |
| 248 | return (struct irt_entry *)a; |
| 249 | } |
| 250 | |
| 251 | /** |
| 252 | * iosapic_load_irt - Fill in the interrupt routing table |
| 253 | * @cell_num: The cell number of the CPU we're currently executing on |
| 254 | * @irt: The address to place the new IRT at |
| 255 | * @return The number of entries found |
| 256 | * |
| 257 | * The "Get PCI INT Routing Table Size" option returns the number of |
| 258 | * entries in the PCI interrupt routing table for the cell specified |
| 259 | * in the cell_number argument. The cell number must be for a cell |
| 260 | * within the caller's protection domain. |
| 261 | * |
| 262 | * The "Get PCI INT Routing Table" option returns, for the cell |
| 263 | * specified in the cell_number argument, the PCI interrupt routing |
| 264 | * table in the caller allocated memory pointed to by mem_addr. |
| 265 | * We assume the IRT only contains entries for I/O SAPIC and |
| 266 | * calculate the size based on the size of I/O sapic entries. |
| 267 | * |
| 268 | * The PCI interrupt routing table entry format is derived from the |
| 269 | * IA64 SAL Specification 2.4. The PCI interrupt routing table defines |
| 270 | * the routing of PCI interrupt signals between the PCI device output |
| 271 | * "pins" and the IO SAPICs' input "lines" (including core I/O PCI |
| 272 | * devices). This table does NOT include information for devices/slots |
| 273 | * behind PCI to PCI bridges. See PCI to PCI Bridge Architecture Spec. |
| 274 | * for the architected method of routing of IRQ's behind PPB's. |
| 275 | */ |
| 276 | |
| 277 | |
| 278 | static int __init |
| 279 | iosapic_load_irt(unsigned long cell_num, struct irt_entry **irt) |
| 280 | { |
| 281 | long status; /* PDC return value status */ |
| 282 | struct irt_entry *table; /* start of interrupt routing tbl */ |
| 283 | unsigned long num_entries = 0UL; |
| 284 | |
| 285 | BUG_ON(!irt); |
| 286 | |
| 287 | if (is_pdc_pat()) { |
| 288 | /* Use pat pdc routine to get interrupt routing table size */ |
| 289 | DBG("calling get_irt_size (cell %ld)\n", cell_num); |
| 290 | status = pdc_pat_get_irt_size(&num_entries, cell_num); |
| 291 | DBG("get_irt_size: %ld\n", status); |
| 292 | |
| 293 | BUG_ON(status != PDC_OK); |
| 294 | BUG_ON(num_entries == 0); |
| 295 | |
| 296 | /* |
| 297 | ** allocate memory for interrupt routing table |
| 298 | ** This interface isn't really right. We are assuming |
| 299 | ** the contents of the table are exclusively |
| 300 | ** for I/O sapic devices. |
| 301 | */ |
| 302 | table = iosapic_alloc_irt(num_entries); |
| 303 | if (table == NULL) { |
| 304 | printk(KERN_WARNING MODULE_NAME ": read_irt : can " |
| 305 | "not alloc mem for IRT\n"); |
| 306 | return 0; |
| 307 | } |
| 308 | |
| 309 | /* get PCI INT routing table */ |
| 310 | status = pdc_pat_get_irt(table, cell_num); |
| 311 | DBG("pdc_pat_get_irt: %ld\n", status); |
| 312 | WARN_ON(status != PDC_OK); |
| 313 | } else { |
| 314 | /* |
| 315 | ** C3000/J5000 (and similar) platforms with Sprockets PDC |
| 316 | ** will return exactly one IRT for all iosapics. |
| 317 | ** So if we have one, don't need to get it again. |
| 318 | */ |
| 319 | if (irt_cell) |
| 320 | return 0; |
| 321 | |
| 322 | /* Should be using the Elroy's HPA, but it's ignored anyway */ |
| 323 | status = pdc_pci_irt_size(&num_entries, 0); |
| 324 | DBG("pdc_pci_irt_size: %ld\n", status); |
| 325 | |
| 326 | if (status != PDC_OK) { |
| 327 | /* Not a "legacy" system with I/O SAPIC either */ |
| 328 | return 0; |
| 329 | } |
| 330 | |
| 331 | BUG_ON(num_entries == 0); |
| 332 | |
| 333 | table = iosapic_alloc_irt(num_entries); |
| 334 | if (!table) { |
| 335 | printk(KERN_WARNING MODULE_NAME ": read_irt : can " |
| 336 | "not alloc mem for IRT\n"); |
| 337 | return 0; |
| 338 | } |
| 339 | |
| 340 | /* HPA ignored by this call too. */ |
| 341 | status = pdc_pci_irt(num_entries, 0, table); |
| 342 | BUG_ON(status != PDC_OK); |
| 343 | } |
| 344 | |
| 345 | /* return interrupt table address */ |
| 346 | *irt = table; |
| 347 | |
| 348 | #ifdef DEBUG_IOSAPIC_IRT |
| 349 | { |
| 350 | struct irt_entry *p = table; |
| 351 | int i; |
| 352 | |
| 353 | printk(MODULE_NAME " Interrupt Routing Table (cell %ld)\n", cell_num); |
| 354 | printk(MODULE_NAME " start = 0x%p num_entries %ld entry_size %d\n", |
| 355 | table, |
| 356 | num_entries, |
| 357 | (int) sizeof(struct irt_entry)); |
| 358 | |
| 359 | for (i = 0 ; i < num_entries ; i++, p++) { |
| 360 | printk(MODULE_NAME " %02x %02x %02x %02x %02x %02x %02x %02x %08x%08x\n", |
| 361 | p->entry_type, p->entry_length, p->interrupt_type, |
| 362 | p->polarity_trigger, p->src_bus_irq_devno, p->src_bus_id, |
| 363 | p->src_seg_id, p->dest_iosapic_intin, |
| 364 | ((u32 *) p)[2], |
| 365 | ((u32 *) p)[3] |
| 366 | ); |
| 367 | } |
| 368 | } |
| 369 | #endif /* DEBUG_IOSAPIC_IRT */ |
| 370 | |
| 371 | return num_entries; |
| 372 | } |
| 373 | |
| 374 | |
| 375 | |
| 376 | void __init iosapic_init(void) |
| 377 | { |
| 378 | unsigned long cell = 0; |
| 379 | |
| 380 | DBG("iosapic_init()\n"); |
| 381 | |
| 382 | #ifdef __LP64__ |
| 383 | if (is_pdc_pat()) { |
| 384 | int status; |
| 385 | struct pdc_pat_cell_num cell_info; |
| 386 | |
| 387 | status = pdc_pat_cell_get_number(&cell_info); |
| 388 | if (status == PDC_OK) { |
| 389 | cell = cell_info.cell_num; |
| 390 | } |
| 391 | } |
| 392 | #endif |
| 393 | |
| 394 | /* get interrupt routing table for this cell */ |
| 395 | irt_num_entry = iosapic_load_irt(cell, &irt_cell); |
| 396 | if (irt_num_entry == 0) |
| 397 | irt_cell = NULL; /* old PDC w/o iosapic */ |
| 398 | } |
| 399 | |
| 400 | |
| 401 | /* |
| 402 | ** Return the IRT entry in case we need to look something else up. |
| 403 | */ |
| 404 | static struct irt_entry * |
| 405 | irt_find_irqline(struct iosapic_info *isi, u8 slot, u8 intr_pin) |
| 406 | { |
| 407 | struct irt_entry *i = irt_cell; |
| 408 | int cnt; /* track how many entries we've looked at */ |
| 409 | u8 irq_devno = (slot << IRT_DEV_SHIFT) | (intr_pin-1); |
| 410 | |
| 411 | DBG_IRT("irt_find_irqline() SLOT %d pin %d\n", slot, intr_pin); |
| 412 | |
| 413 | for (cnt=0; cnt < irt_num_entry; cnt++, i++) { |
| 414 | |
| 415 | /* |
| 416 | ** Validate: entry_type, entry_length, interrupt_type |
| 417 | ** |
| 418 | ** Difference between validate vs compare is the former |
| 419 | ** should print debug info and is not expected to "fail" |
| 420 | ** on current platforms. |
| 421 | */ |
| 422 | if (i->entry_type != IRT_IOSAPIC_TYPE) { |
| 423 | DBG_IRT(KERN_WARNING MODULE_NAME ":find_irqline(0x%p): skipping entry %d type %d\n", i, cnt, i->entry_type); |
| 424 | continue; |
| 425 | } |
| 426 | |
| 427 | if (i->entry_length != IRT_IOSAPIC_LENGTH) { |
| 428 | DBG_IRT(KERN_WARNING MODULE_NAME ":find_irqline(0x%p): skipping entry %d length %d\n", i, cnt, i->entry_length); |
| 429 | continue; |
| 430 | } |
| 431 | |
| 432 | if (i->interrupt_type != IRT_VECTORED_INTR) { |
| 433 | DBG_IRT(KERN_WARNING MODULE_NAME ":find_irqline(0x%p): skipping entry %d interrupt_type %d\n", i, cnt, i->interrupt_type); |
| 434 | continue; |
| 435 | } |
| 436 | |
| 437 | if (!COMPARE_IRTE_ADDR(i, isi->isi_hpa)) |
| 438 | continue; |
| 439 | |
| 440 | if ((i->src_bus_irq_devno & IRT_IRQ_DEVNO_MASK) != irq_devno) |
| 441 | continue; |
| 442 | |
| 443 | /* |
| 444 | ** Ignore: src_bus_id and rc_seg_id correlate with |
| 445 | ** iosapic_info->isi_hpa on HP platforms. |
| 446 | ** If needed, pass in "PFA" (aka config space addr) |
| 447 | ** instead of slot. |
| 448 | */ |
| 449 | |
| 450 | /* Found it! */ |
| 451 | return i; |
| 452 | } |
| 453 | |
| 454 | printk(KERN_WARNING MODULE_NAME ": 0x%lx : no IRT entry for slot %d, pin %d\n", |
| 455 | isi->isi_hpa, slot, intr_pin); |
| 456 | return NULL; |
| 457 | } |
| 458 | |
| 459 | |
| 460 | /* |
| 461 | ** xlate_pin() supports the skewing of IRQ lines done by subsidiary bridges. |
| 462 | ** Legacy PDC already does this translation for us and stores it in INTR_LINE. |
| 463 | ** |
| 464 | ** PAT PDC needs to basically do what legacy PDC does: |
| 465 | ** o read PIN |
| 466 | ** o adjust PIN in case device is "behind" a PPB |
| 467 | ** (eg 4-port 100BT and SCSI/LAN "Combo Card") |
| 468 | ** o convert slot/pin to I/O SAPIC input line. |
| 469 | ** |
| 470 | ** HP platforms only support: |
| 471 | ** o one level of skewing for any number of PPBs |
| 472 | ** o only support PCI-PCI Bridges. |
| 473 | */ |
| 474 | static struct irt_entry * |
| 475 | iosapic_xlate_pin(struct iosapic_info *isi, struct pci_dev *pcidev) |
| 476 | { |
| 477 | u8 intr_pin, intr_slot; |
| 478 | |
| 479 | pci_read_config_byte(pcidev, PCI_INTERRUPT_PIN, &intr_pin); |
| 480 | |
| 481 | DBG_IRT("iosapic_xlate_pin(%s) SLOT %d pin %d\n", |
| 482 | pcidev->slot_name, PCI_SLOT(pcidev->devfn), intr_pin); |
| 483 | |
| 484 | if (intr_pin == 0) { |
| 485 | /* The device does NOT support/use IRQ lines. */ |
| 486 | return NULL; |
| 487 | } |
| 488 | |
| 489 | /* Check if pcidev behind a PPB */ |
| 490 | if (NULL != pcidev->bus->self) { |
| 491 | /* Convert pcidev INTR_PIN into something we |
| 492 | ** can lookup in the IRT. |
| 493 | */ |
| 494 | #ifdef PCI_BRIDGE_FUNCS |
| 495 | /* |
| 496 | ** Proposal #1: |
| 497 | ** |
| 498 | ** call implementation specific translation function |
| 499 | ** This is architecturally "cleaner". HP-UX doesn't |
| 500 | ** support other secondary bus types (eg. E/ISA) directly. |
| 501 | ** May be needed for other processor (eg IA64) architectures |
| 502 | ** or by some ambitous soul who wants to watch TV. |
| 503 | */ |
| 504 | if (pci_bridge_funcs->xlate_intr_line) { |
| 505 | intr_pin = pci_bridge_funcs->xlate_intr_line(pcidev); |
| 506 | } |
| 507 | #else /* PCI_BRIDGE_FUNCS */ |
| 508 | struct pci_bus *p = pcidev->bus; |
| 509 | /* |
| 510 | ** Proposal #2: |
| 511 | ** The "pin" is skewed ((pin + dev - 1) % 4). |
| 512 | ** |
| 513 | ** This isn't very clean since I/O SAPIC must assume: |
| 514 | ** - all platforms only have PCI busses. |
| 515 | ** - only PCI-PCI bridge (eg not PCI-EISA, PCI-PCMCIA) |
| 516 | ** - IRQ routing is only skewed once regardless of |
| 517 | ** the number of PPB's between iosapic and device. |
| 518 | ** (Bit3 expansion chassis follows this rule) |
| 519 | ** |
| 520 | ** Advantage is it's really easy to implement. |
| 521 | */ |
| 522 | intr_pin = ((intr_pin-1)+PCI_SLOT(pcidev->devfn)) % 4; |
| 523 | intr_pin++; /* convert back to INTA-D (1-4) */ |
| 524 | #endif /* PCI_BRIDGE_FUNCS */ |
| 525 | |
| 526 | /* |
| 527 | ** Locate the host slot the PPB nearest the Host bus |
| 528 | ** adapter. |
| 529 | */ |
| 530 | while (NULL != p->parent->self) |
| 531 | p = p->parent; |
| 532 | |
| 533 | intr_slot = PCI_SLOT(p->self->devfn); |
| 534 | } else { |
| 535 | intr_slot = PCI_SLOT(pcidev->devfn); |
| 536 | } |
| 537 | DBG_IRT("iosapic_xlate_pin: bus %d slot %d pin %d\n", |
| 538 | pcidev->bus->secondary, intr_slot, intr_pin); |
| 539 | |
| 540 | return irt_find_irqline(isi, intr_slot, intr_pin); |
| 541 | } |
| 542 | |
| 543 | static void iosapic_rd_irt_entry(struct vector_info *vi , u32 *dp0, u32 *dp1) |
| 544 | { |
| 545 | struct iosapic_info *isp = vi->iosapic; |
| 546 | u8 idx = vi->irqline; |
| 547 | |
| 548 | *dp0 = iosapic_read(isp->addr, IOSAPIC_IRDT_ENTRY(idx)); |
| 549 | *dp1 = iosapic_read(isp->addr, IOSAPIC_IRDT_ENTRY_HI(idx)); |
| 550 | } |
| 551 | |
| 552 | |
| 553 | static void iosapic_wr_irt_entry(struct vector_info *vi, u32 dp0, u32 dp1) |
| 554 | { |
| 555 | struct iosapic_info *isp = vi->iosapic; |
| 556 | |
| 557 | DBG_IRT("iosapic_wr_irt_entry(): irq %d hpa %lx 0x%x 0x%x\n", |
| 558 | vi->irqline, isp->isi_hpa, dp0, dp1); |
| 559 | |
| 560 | iosapic_write(isp->addr, IOSAPIC_IRDT_ENTRY(vi->irqline), dp0); |
| 561 | |
| 562 | /* Read the window register to flush the writes down to HW */ |
| 563 | dp0 = readl(isp->addr+IOSAPIC_REG_WINDOW); |
| 564 | |
| 565 | iosapic_write(isp->addr, IOSAPIC_IRDT_ENTRY_HI(vi->irqline), dp1); |
| 566 | |
| 567 | /* Read the window register to flush the writes down to HW */ |
| 568 | dp1 = readl(isp->addr+IOSAPIC_REG_WINDOW); |
| 569 | } |
| 570 | |
| 571 | /* |
| 572 | ** set_irt prepares the data (dp0, dp1) according to the vector_info |
| 573 | ** and target cpu (id_eid). dp0/dp1 are then used to program I/O SAPIC |
| 574 | ** IRdT for the given "vector" (aka IRQ line). |
| 575 | */ |
| 576 | static void |
| 577 | iosapic_set_irt_data( struct vector_info *vi, u32 *dp0, u32 *dp1) |
| 578 | { |
| 579 | u32 mode = 0; |
| 580 | struct irt_entry *p = vi->irte; |
| 581 | |
| 582 | if ((p->polarity_trigger & IRT_PO_MASK) == IRT_ACTIVE_LO) |
| 583 | mode |= IOSAPIC_IRDT_PO_LOW; |
| 584 | |
| 585 | if (((p->polarity_trigger >> IRT_EL_SHIFT) & IRT_EL_MASK) == IRT_LEVEL_TRIG) |
| 586 | mode |= IOSAPIC_IRDT_LEVEL_TRIG; |
| 587 | |
| 588 | /* |
| 589 | ** IA64 REVISIT |
| 590 | ** PA doesn't support EXTINT or LPRIO bits. |
| 591 | */ |
| 592 | |
| 593 | *dp0 = mode | (u32) vi->txn_data; |
| 594 | |
| 595 | /* |
| 596 | ** Extracting id_eid isn't a real clean way of getting it. |
| 597 | ** But the encoding is the same for both PA and IA64 platforms. |
| 598 | */ |
| 599 | if (is_pdc_pat()) { |
| 600 | /* |
| 601 | ** PAT PDC just hands it to us "right". |
| 602 | ** txn_addr comes from cpu_data[x].txn_addr. |
| 603 | */ |
| 604 | *dp1 = (u32) (vi->txn_addr); |
| 605 | } else { |
| 606 | /* |
| 607 | ** eg if base_addr == 0xfffa0000), |
| 608 | ** we want to get 0xa0ff0000. |
| 609 | ** |
| 610 | ** eid 0x0ff00000 -> 0x00ff0000 |
| 611 | ** id 0x000ff000 -> 0xff000000 |
| 612 | */ |
| 613 | *dp1 = (((u32)vi->txn_addr & 0x0ff00000) >> 4) | |
| 614 | (((u32)vi->txn_addr & 0x000ff000) << 12); |
| 615 | } |
| 616 | DBG_IRT("iosapic_set_irt_data(): 0x%x 0x%x\n", *dp0, *dp1); |
| 617 | } |
| 618 | |
| 619 | |
| 620 | static struct vector_info *iosapic_get_vector(unsigned int irq) |
| 621 | { |
| 622 | return irq_desc[irq].handler_data; |
| 623 | } |
| 624 | |
| 625 | static void iosapic_disable_irq(unsigned int irq) |
| 626 | { |
| 627 | unsigned long flags; |
| 628 | struct vector_info *vi = iosapic_get_vector(irq); |
| 629 | u32 d0, d1; |
| 630 | |
| 631 | spin_lock_irqsave(&iosapic_lock, flags); |
| 632 | iosapic_rd_irt_entry(vi, &d0, &d1); |
| 633 | d0 |= IOSAPIC_IRDT_ENABLE; |
| 634 | iosapic_wr_irt_entry(vi, d0, d1); |
| 635 | spin_unlock_irqrestore(&iosapic_lock, flags); |
| 636 | } |
| 637 | |
| 638 | static void iosapic_enable_irq(unsigned int irq) |
| 639 | { |
| 640 | struct vector_info *vi = iosapic_get_vector(irq); |
| 641 | u32 d0, d1; |
| 642 | |
| 643 | /* data is initialized by fixup_irq */ |
| 644 | WARN_ON(vi->txn_irq == 0); |
| 645 | |
| 646 | iosapic_set_irt_data(vi, &d0, &d1); |
| 647 | iosapic_wr_irt_entry(vi, d0, d1); |
| 648 | |
| 649 | #ifdef DEBUG_IOSAPIC_IRT |
| 650 | { |
| 651 | u32 *t = (u32 *) ((ulong) vi->eoi_addr & ~0xffUL); |
| 652 | printk("iosapic_enable_irq(): regs %p", vi->eoi_addr); |
| 653 | for ( ; t < vi->eoi_addr; t++) |
| 654 | printk(" %x", readl(t)); |
| 655 | printk("\n"); |
| 656 | } |
| 657 | |
| 658 | printk("iosapic_enable_irq(): sel "); |
| 659 | { |
| 660 | struct iosapic_info *isp = vi->iosapic; |
| 661 | |
| 662 | for (d0=0x10; d0<0x1e; d0++) { |
| 663 | d1 = iosapic_read(isp->addr, d0); |
| 664 | printk(" %x", d1); |
| 665 | } |
| 666 | } |
| 667 | printk("\n"); |
| 668 | #endif |
| 669 | |
| 670 | /* |
| 671 | * Issuing I/O SAPIC an EOI causes an interrupt IFF IRQ line is |
| 672 | * asserted. IRQ generally should not be asserted when a driver |
| 673 | * enables their IRQ. It can lead to "interesting" race conditions |
| 674 | * in the driver initialization sequence. |
| 675 | */ |
| 676 | DBG(KERN_DEBUG "enable_irq(%d): eoi(%p, 0x%x)\n", irq, |
| 677 | vi->eoi_addr, vi->eoi_data); |
| 678 | iosapic_eoi(vi->eoi_addr, vi->eoi_data); |
| 679 | } |
| 680 | |
| 681 | /* |
| 682 | * PARISC only supports PCI devices below I/O SAPIC. |
| 683 | * PCI only supports level triggered in order to share IRQ lines. |
| 684 | * ergo I/O SAPIC must always issue EOI on parisc. |
| 685 | * |
| 686 | * i386/ia64 support ISA devices and have to deal with |
| 687 | * edge-triggered interrupts too. |
| 688 | */ |
| 689 | static void iosapic_end_irq(unsigned int irq) |
| 690 | { |
| 691 | struct vector_info *vi = iosapic_get_vector(irq); |
| 692 | DBG(KERN_DEBUG "end_irq(%d): eoi(%p, 0x%x)\n", irq, |
| 693 | vi->eoi_addr, vi->eoi_data); |
| 694 | iosapic_eoi(vi->eoi_addr, vi->eoi_data); |
| 695 | } |
| 696 | |
| 697 | static unsigned int iosapic_startup_irq(unsigned int irq) |
| 698 | { |
| 699 | iosapic_enable_irq(irq); |
| 700 | return 0; |
| 701 | } |
| 702 | |
| 703 | static struct hw_interrupt_type iosapic_interrupt_type = { |
| 704 | .typename = "IO-SAPIC-level", |
| 705 | .startup = iosapic_startup_irq, |
| 706 | .shutdown = iosapic_disable_irq, |
| 707 | .enable = iosapic_enable_irq, |
| 708 | .disable = iosapic_disable_irq, |
| 709 | .ack = no_ack_irq, |
| 710 | .end = iosapic_end_irq, |
| 711 | // .set_affinity = iosapic_set_affinity_irq, |
| 712 | }; |
| 713 | |
| 714 | int iosapic_fixup_irq(void *isi_obj, struct pci_dev *pcidev) |
| 715 | { |
| 716 | struct iosapic_info *isi = isi_obj; |
| 717 | struct irt_entry *irte = NULL; /* only used if PAT PDC */ |
| 718 | struct vector_info *vi; |
| 719 | int isi_line; /* line used by device */ |
| 720 | |
| 721 | if (!isi) { |
| 722 | printk(KERN_WARNING MODULE_NAME ": hpa not registered for %s\n", |
| 723 | pci_name(pcidev)); |
| 724 | return -1; |
| 725 | } |
| 726 | |
| 727 | #ifdef CONFIG_SUPERIO |
| 728 | /* |
| 729 | * HACK ALERT! (non-compliant PCI device support) |
| 730 | * |
| 731 | * All SuckyIO interrupts are routed through the PIC's on function 1. |
| 732 | * But SuckyIO OHCI USB controller gets an IRT entry anyway because |
| 733 | * it advertises INT D for INT_PIN. Use that IRT entry to get the |
| 734 | * SuckyIO interrupt routing for PICs on function 1 (*BLEECCHH*). |
| 735 | */ |
| 736 | if (is_superio_device(pcidev)) { |
| 737 | /* We must call superio_fixup_irq() to register the pdev */ |
| 738 | pcidev->irq = superio_fixup_irq(pcidev); |
| 739 | |
| 740 | /* Don't return if need to program the IOSAPIC's IRT... */ |
| 741 | if (PCI_FUNC(pcidev->devfn) != SUPERIO_USB_FN) |
| 742 | return pcidev->irq; |
| 743 | } |
| 744 | #endif /* CONFIG_SUPERIO */ |
| 745 | |
| 746 | /* lookup IRT entry for isi/slot/pin set */ |
| 747 | irte = iosapic_xlate_pin(isi, pcidev); |
| 748 | if (!irte) { |
| 749 | printk("iosapic: no IRTE for %s (IRQ not connected?)\n", |
| 750 | pci_name(pcidev)); |
| 751 | return -1; |
| 752 | } |
| 753 | DBG_IRT("iosapic_fixup_irq(): irte %p %x %x %x %x %x %x %x %x\n", |
| 754 | irte, |
| 755 | irte->entry_type, |
| 756 | irte->entry_length, |
| 757 | irte->polarity_trigger, |
| 758 | irte->src_bus_irq_devno, |
| 759 | irte->src_bus_id, |
| 760 | irte->src_seg_id, |
| 761 | irte->dest_iosapic_intin, |
| 762 | (u32) irte->dest_iosapic_addr); |
| 763 | isi_line = irte->dest_iosapic_intin; |
| 764 | |
| 765 | /* get vector info for this input line */ |
| 766 | vi = isi->isi_vector + isi_line; |
| 767 | DBG_IRT("iosapic_fixup_irq: line %d vi 0x%p\n", isi_line, vi); |
| 768 | |
| 769 | /* If this IRQ line has already been setup, skip it */ |
| 770 | if (vi->irte) |
| 771 | goto out; |
| 772 | |
| 773 | vi->irte = irte; |
| 774 | |
| 775 | /* |
| 776 | * Allocate processor IRQ |
| 777 | * |
| 778 | * XXX/FIXME The txn_alloc_irq() code and related code should be |
| 779 | * moved to enable_irq(). That way we only allocate processor IRQ |
| 780 | * bits for devices that actually have drivers claiming them. |
| 781 | * Right now we assign an IRQ to every PCI device present, |
| 782 | * regardless of whether it's used or not. |
| 783 | */ |
| 784 | vi->txn_irq = txn_alloc_irq(8); |
| 785 | |
| 786 | if (vi->txn_irq < 0) |
| 787 | panic("I/O sapic: couldn't get TXN IRQ\n"); |
| 788 | |
| 789 | /* enable_irq() will use txn_* to program IRdT */ |
| 790 | vi->txn_addr = txn_alloc_addr(vi->txn_irq); |
| 791 | vi->txn_data = txn_alloc_data(vi->txn_irq); |
| 792 | |
| 793 | vi->eoi_addr = isi->addr + IOSAPIC_REG_EOI; |
| 794 | vi->eoi_data = cpu_to_le32(vi->txn_data); |
| 795 | |
| 796 | cpu_claim_irq(vi->txn_irq, &iosapic_interrupt_type, vi); |
| 797 | |
| 798 | out: |
| 799 | pcidev->irq = vi->txn_irq; |
| 800 | |
| 801 | DBG_IRT("iosapic_fixup_irq() %d:%d %x %x line %d irq %d\n", |
| 802 | PCI_SLOT(pcidev->devfn), PCI_FUNC(pcidev->devfn), |
| 803 | pcidev->vendor, pcidev->device, isi_line, pcidev->irq); |
| 804 | |
| 805 | return pcidev->irq; |
| 806 | } |
| 807 | |
| 808 | |
| 809 | /* |
| 810 | ** squirrel away the I/O Sapic Version |
| 811 | */ |
| 812 | static unsigned int |
| 813 | iosapic_rd_version(struct iosapic_info *isi) |
| 814 | { |
| 815 | return iosapic_read(isi->addr, IOSAPIC_REG_VERSION); |
| 816 | } |
| 817 | |
| 818 | |
| 819 | /* |
| 820 | ** iosapic_register() is called by "drivers" with an integrated I/O SAPIC. |
| 821 | ** Caller must be certain they have an I/O SAPIC and know its MMIO address. |
| 822 | ** |
| 823 | ** o allocate iosapic_info and add it to the list |
| 824 | ** o read iosapic version and squirrel that away |
| 825 | ** o read size of IRdT. |
| 826 | ** o allocate and initialize isi_vector[] |
| 827 | ** o allocate irq region |
| 828 | */ |
| 829 | void *iosapic_register(unsigned long hpa) |
| 830 | { |
| 831 | struct iosapic_info *isi = NULL; |
| 832 | struct irt_entry *irte = irt_cell; |
| 833 | struct vector_info *vip; |
| 834 | int cnt; /* track how many entries we've looked at */ |
| 835 | |
| 836 | /* |
| 837 | * Astro based platforms can only support PCI OLARD if they implement |
| 838 | * PAT PDC. Legacy PDC omits LBAs with no PCI devices from the IRT. |
| 839 | * Search the IRT and ignore iosapic's which aren't in the IRT. |
| 840 | */ |
| 841 | for (cnt=0; cnt < irt_num_entry; cnt++, irte++) { |
| 842 | WARN_ON(IRT_IOSAPIC_TYPE != irte->entry_type); |
| 843 | if (COMPARE_IRTE_ADDR(irte, hpa)) |
| 844 | break; |
| 845 | } |
| 846 | |
| 847 | if (cnt >= irt_num_entry) { |
| 848 | DBG("iosapic_register() ignoring 0x%lx (NOT FOUND)\n", hpa); |
| 849 | return NULL; |
| 850 | } |
| 851 | |
| 852 | isi = (struct iosapic_info *)kmalloc(sizeof(struct iosapic_info), GFP_KERNEL); |
| 853 | if (!isi) { |
| 854 | BUG(); |
| 855 | return NULL; |
| 856 | } |
| 857 | |
| 858 | memset(isi, 0, sizeof(struct iosapic_info)); |
| 859 | |
| 860 | isi->addr = ioremap(hpa, 4096); |
| 861 | isi->isi_hpa = hpa; |
| 862 | isi->isi_version = iosapic_rd_version(isi); |
| 863 | isi->isi_num_vectors = IOSAPIC_IRDT_MAX_ENTRY(isi->isi_version) + 1; |
| 864 | |
| 865 | vip = isi->isi_vector = (struct vector_info *) |
| 866 | kmalloc(sizeof(struct vector_info) * isi->isi_num_vectors, GFP_KERNEL); |
| 867 | if (vip == NULL) { |
| 868 | kfree(isi); |
| 869 | return NULL; |
| 870 | } |
| 871 | |
| 872 | memset(vip, 0, sizeof(struct vector_info) * isi->isi_num_vectors); |
| 873 | |
| 874 | for (cnt=0; cnt < isi->isi_num_vectors; cnt++, vip++) { |
| 875 | vip->irqline = (unsigned char) cnt; |
| 876 | vip->iosapic = isi; |
| 877 | } |
| 878 | return isi; |
| 879 | } |
| 880 | |
| 881 | |
| 882 | #ifdef DEBUG_IOSAPIC |
| 883 | |
| 884 | static void |
| 885 | iosapic_prt_irt(void *irt, long num_entry) |
| 886 | { |
| 887 | unsigned int i, *irp = (unsigned int *) irt; |
| 888 | |
| 889 | |
| 890 | printk(KERN_DEBUG MODULE_NAME ": Interrupt Routing Table (%lx entries)\n", num_entry); |
| 891 | |
| 892 | for (i=0; i<num_entry; i++, irp += 4) { |
| 893 | printk(KERN_DEBUG "%p : %2d %.8x %.8x %.8x %.8x\n", |
| 894 | irp, i, irp[0], irp[1], irp[2], irp[3]); |
| 895 | } |
| 896 | } |
| 897 | |
| 898 | |
| 899 | static void |
| 900 | iosapic_prt_vi(struct vector_info *vi) |
| 901 | { |
| 902 | printk(KERN_DEBUG MODULE_NAME ": vector_info[%d] is at %p\n", vi->irqline, vi); |
| 903 | printk(KERN_DEBUG "\t\tstatus: %.4x\n", vi->status); |
| 904 | printk(KERN_DEBUG "\t\ttxn_irq: %d\n", vi->txn_irq); |
| 905 | printk(KERN_DEBUG "\t\ttxn_addr: %lx\n", vi->txn_addr); |
| 906 | printk(KERN_DEBUG "\t\ttxn_data: %lx\n", vi->txn_data); |
| 907 | printk(KERN_DEBUG "\t\teoi_addr: %p\n", vi->eoi_addr); |
| 908 | printk(KERN_DEBUG "\t\teoi_data: %x\n", vi->eoi_data); |
| 909 | } |
| 910 | |
| 911 | |
| 912 | static void |
| 913 | iosapic_prt_isi(struct iosapic_info *isi) |
| 914 | { |
| 915 | printk(KERN_DEBUG MODULE_NAME ": io_sapic_info at %p\n", isi); |
| 916 | printk(KERN_DEBUG "\t\tisi_hpa: %lx\n", isi->isi_hpa); |
| 917 | printk(KERN_DEBUG "\t\tisi_status: %x\n", isi->isi_status); |
| 918 | printk(KERN_DEBUG "\t\tisi_version: %x\n", isi->isi_version); |
| 919 | printk(KERN_DEBUG "\t\tisi_vector: %p\n", isi->isi_vector); |
| 920 | } |
| 921 | #endif /* DEBUG_IOSAPIC */ |