Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | ** ----------- | |
0779bf2d | 53 | ** PA-RISC platforms have two fundamentally different types of firmware. |
1da177e4 LT |
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. | |
0779bf2d ML |
57 | ** PAT firmware only initializes the PCI Console and Boot interface. |
58 | ** With these tables, the OS can program all other PCI devices. | |
1da177e4 LT |
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> | |
1da177e4 LT |
143 | #include <asm/io.h> /* read/write functions */ |
144 | #ifdef CONFIG_SUPERIO | |
145 | #include <asm/superio.h> | |
146 | #endif | |
147 | ||
1790cf91 | 148 | #include <asm/ropes.h> |
1da177e4 LT |
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 | ||
a9f6a0dd | 217 | static DEFINE_SPINLOCK(iosapic_lock); |
1da177e4 LT |
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); | |
3aa0862c | 246 | a = (a + 7UL) & ~7UL; |
1da177e4 LT |
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 */ | |
9785d646 | 489 | if (pcidev->bus->parent) { |
1da177e4 LT |
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 | */ | |
f0e88af8 | 521 | intr_pin = pci_swizzle_interrupt_pin(pcidev, intr_pin); |
1da177e4 LT |
522 | #endif /* PCI_BRIDGE_FUNCS */ |
523 | ||
524 | /* | |
9785d646 GG |
525 | * Locate the host slot of the PPB. |
526 | */ | |
527 | while (p->parent->parent) | |
1da177e4 LT |
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->secondary, 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 | ||
4c4231ea | 617 | static void iosapic_mask_irq(struct irq_data *d) |
1da177e4 LT |
618 | { |
619 | unsigned long flags; | |
4c4231ea | 620 | struct vector_info *vi = irq_data_get_irq_chip_data(d); |
1da177e4 LT |
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 | ||
4c4231ea | 630 | static void iosapic_unmask_irq(struct irq_data *d) |
1da177e4 | 631 | { |
4c4231ea | 632 | struct vector_info *vi = irq_data_get_irq_chip_data(d); |
1da177e4 LT |
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 | */ | |
4c4231ea | 668 | DBG(KERN_DEBUG "enable_irq(%d): eoi(%p, 0x%x)\n", d->irq, |
1da177e4 LT |
669 | vi->eoi_addr, vi->eoi_data); |
670 | iosapic_eoi(vi->eoi_addr, vi->eoi_data); | |
51890613 JB |
671 | } |
672 | ||
4c4231ea | 673 | static void iosapic_eoi_irq(struct irq_data *d) |
51890613 | 674 | { |
4c4231ea | 675 | struct vector_info *vi = irq_data_get_irq_chip_data(d); |
51890613 JB |
676 | |
677 | iosapic_eoi(vi->eoi_addr, vi->eoi_data); | |
4c4231ea | 678 | cpu_eoi_irq(d); |
1da177e4 LT |
679 | } |
680 | ||
c2ab64d0 | 681 | #ifdef CONFIG_SMP |
4c4231ea TG |
682 | static int iosapic_set_affinity_irq(struct irq_data *d, |
683 | const struct cpumask *dest, bool force) | |
c2ab64d0 | 684 | { |
4c4231ea | 685 | struct vector_info *vi = irq_data_get_irq_chip_data(d); |
c2ab64d0 JB |
686 | u32 d0, d1, dummy_d0; |
687 | unsigned long flags; | |
8b6649c5 | 688 | int dest_cpu; |
c2ab64d0 | 689 | |
4c4231ea | 690 | dest_cpu = cpu_check_affinity(d, dest); |
8b6649c5 | 691 | if (dest_cpu < 0) |
d5dedd45 | 692 | return -1; |
c2ab64d0 | 693 | |
4c4231ea TG |
694 | cpumask_copy(d->affinity, cpumask_of(dest_cpu)); |
695 | vi->txn_addr = txn_affinity_addr(d->irq, dest_cpu); | |
c2ab64d0 JB |
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); | |
d5dedd45 YL |
704 | |
705 | return 0; | |
c2ab64d0 JB |
706 | } |
707 | #endif | |
708 | ||
dfe07565 | 709 | static struct irq_chip iosapic_interrupt_type = { |
4c4231ea TG |
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, | |
c2ab64d0 | 715 | #ifdef CONFIG_SMP |
4c4231ea | 716 | .irq_set_affinity = iosapic_set_affinity_irq, |
c2ab64d0 | 717 | #endif |
1da177e4 LT |
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 | ||
815 | /* | |
816 | ** squirrel away the I/O Sapic Version | |
817 | */ | |
818 | static unsigned int | |
819 | iosapic_rd_version(struct iosapic_info *isi) | |
820 | { | |
821 | return iosapic_read(isi->addr, IOSAPIC_REG_VERSION); | |
822 | } | |
823 | ||
824 | ||
825 | /* | |
826 | ** iosapic_register() is called by "drivers" with an integrated I/O SAPIC. | |
827 | ** Caller must be certain they have an I/O SAPIC and know its MMIO address. | |
828 | ** | |
829 | ** o allocate iosapic_info and add it to the list | |
830 | ** o read iosapic version and squirrel that away | |
831 | ** o read size of IRdT. | |
832 | ** o allocate and initialize isi_vector[] | |
833 | ** o allocate irq region | |
834 | */ | |
835 | void *iosapic_register(unsigned long hpa) | |
836 | { | |
837 | struct iosapic_info *isi = NULL; | |
838 | struct irt_entry *irte = irt_cell; | |
839 | struct vector_info *vip; | |
840 | int cnt; /* track how many entries we've looked at */ | |
841 | ||
842 | /* | |
843 | * Astro based platforms can only support PCI OLARD if they implement | |
844 | * PAT PDC. Legacy PDC omits LBAs with no PCI devices from the IRT. | |
845 | * Search the IRT and ignore iosapic's which aren't in the IRT. | |
846 | */ | |
847 | for (cnt=0; cnt < irt_num_entry; cnt++, irte++) { | |
848 | WARN_ON(IRT_IOSAPIC_TYPE != irte->entry_type); | |
849 | if (COMPARE_IRTE_ADDR(irte, hpa)) | |
850 | break; | |
851 | } | |
852 | ||
853 | if (cnt >= irt_num_entry) { | |
854 | DBG("iosapic_register() ignoring 0x%lx (NOT FOUND)\n", hpa); | |
855 | return NULL; | |
856 | } | |
857 | ||
5cbded58 | 858 | isi = kzalloc(sizeof(struct iosapic_info), GFP_KERNEL); |
1da177e4 LT |
859 | if (!isi) { |
860 | BUG(); | |
861 | return NULL; | |
862 | } | |
863 | ||
5076c158 | 864 | isi->addr = ioremap_nocache(hpa, 4096); |
1da177e4 LT |
865 | isi->isi_hpa = hpa; |
866 | isi->isi_version = iosapic_rd_version(isi); | |
867 | isi->isi_num_vectors = IOSAPIC_IRDT_MAX_ENTRY(isi->isi_version) + 1; | |
868 | ||
f8301041 JP |
869 | vip = isi->isi_vector = kcalloc(isi->isi_num_vectors, |
870 | sizeof(struct vector_info), GFP_KERNEL); | |
1da177e4 LT |
871 | if (vip == NULL) { |
872 | kfree(isi); | |
873 | return NULL; | |
874 | } | |
875 | ||
1da177e4 LT |
876 | for (cnt=0; cnt < isi->isi_num_vectors; cnt++, vip++) { |
877 | vip->irqline = (unsigned char) cnt; | |
878 | vip->iosapic = isi; | |
879 | } | |
880 | return isi; | |
881 | } | |
882 | ||
883 | ||
884 | #ifdef DEBUG_IOSAPIC | |
885 | ||
886 | static void | |
887 | iosapic_prt_irt(void *irt, long num_entry) | |
888 | { | |
889 | unsigned int i, *irp = (unsigned int *) irt; | |
890 | ||
891 | ||
892 | printk(KERN_DEBUG MODULE_NAME ": Interrupt Routing Table (%lx entries)\n", num_entry); | |
893 | ||
894 | for (i=0; i<num_entry; i++, irp += 4) { | |
895 | printk(KERN_DEBUG "%p : %2d %.8x %.8x %.8x %.8x\n", | |
896 | irp, i, irp[0], irp[1], irp[2], irp[3]); | |
897 | } | |
898 | } | |
899 | ||
900 | ||
901 | static void | |
902 | iosapic_prt_vi(struct vector_info *vi) | |
903 | { | |
904 | printk(KERN_DEBUG MODULE_NAME ": vector_info[%d] is at %p\n", vi->irqline, vi); | |
905 | printk(KERN_DEBUG "\t\tstatus: %.4x\n", vi->status); | |
906 | printk(KERN_DEBUG "\t\ttxn_irq: %d\n", vi->txn_irq); | |
907 | printk(KERN_DEBUG "\t\ttxn_addr: %lx\n", vi->txn_addr); | |
908 | printk(KERN_DEBUG "\t\ttxn_data: %lx\n", vi->txn_data); | |
909 | printk(KERN_DEBUG "\t\teoi_addr: %p\n", vi->eoi_addr); | |
910 | printk(KERN_DEBUG "\t\teoi_data: %x\n", vi->eoi_data); | |
911 | } | |
912 | ||
913 | ||
914 | static void | |
915 | iosapic_prt_isi(struct iosapic_info *isi) | |
916 | { | |
917 | printk(KERN_DEBUG MODULE_NAME ": io_sapic_info at %p\n", isi); | |
918 | printk(KERN_DEBUG "\t\tisi_hpa: %lx\n", isi->isi_hpa); | |
919 | printk(KERN_DEBUG "\t\tisi_status: %x\n", isi->isi_status); | |
920 | printk(KERN_DEBUG "\t\tisi_version: %x\n", isi->isi_version); | |
921 | printk(KERN_DEBUG "\t\tisi_vector: %p\n", isi->isi_vector); | |
922 | } | |
923 | #endif /* DEBUG_IOSAPIC */ |