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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> | |
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 | ||
1790cf91 | 149 | #include <asm/ropes.h> |
1da177e4 LT |
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 | ||
a9f6a0dd | 218 | static DEFINE_SPINLOCK(iosapic_lock); |
1da177e4 LT |
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); | |
3aa0862c | 247 | a = (a + 7UL) & ~7UL; |
1da177e4 LT |
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 */ | |
9785d646 | 490 | if (pcidev->bus->parent) { |
1da177e4 LT |
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 | */ | |
f0e88af8 | 522 | intr_pin = pci_swizzle_interrupt_pin(pcidev, intr_pin); |
1da177e4 LT |
523 | #endif /* PCI_BRIDGE_FUNCS */ |
524 | ||
525 | /* | |
9785d646 GG |
526 | * Locate the host slot of the PPB. |
527 | */ | |
528 | while (p->parent->parent) | |
1da177e4 LT |
529 | p = p->parent; |
530 | ||
531 | intr_slot = PCI_SLOT(p->self->devfn); | |
532 | } else { | |
533 | intr_slot = PCI_SLOT(pcidev->devfn); | |
534 | } | |
535 | DBG_IRT("iosapic_xlate_pin: bus %d slot %d pin %d\n", | |
536 | pcidev->bus->secondary, intr_slot, intr_pin); | |
537 | ||
538 | return irt_find_irqline(isi, intr_slot, intr_pin); | |
539 | } | |
540 | ||
541 | static void iosapic_rd_irt_entry(struct vector_info *vi , u32 *dp0, u32 *dp1) | |
542 | { | |
543 | struct iosapic_info *isp = vi->iosapic; | |
544 | u8 idx = vi->irqline; | |
545 | ||
546 | *dp0 = iosapic_read(isp->addr, IOSAPIC_IRDT_ENTRY(idx)); | |
547 | *dp1 = iosapic_read(isp->addr, IOSAPIC_IRDT_ENTRY_HI(idx)); | |
548 | } | |
549 | ||
550 | ||
551 | static void iosapic_wr_irt_entry(struct vector_info *vi, u32 dp0, u32 dp1) | |
552 | { | |
553 | struct iosapic_info *isp = vi->iosapic; | |
554 | ||
555 | DBG_IRT("iosapic_wr_irt_entry(): irq %d hpa %lx 0x%x 0x%x\n", | |
556 | vi->irqline, isp->isi_hpa, dp0, dp1); | |
557 | ||
558 | iosapic_write(isp->addr, IOSAPIC_IRDT_ENTRY(vi->irqline), dp0); | |
559 | ||
560 | /* Read the window register to flush the writes down to HW */ | |
561 | dp0 = readl(isp->addr+IOSAPIC_REG_WINDOW); | |
562 | ||
563 | iosapic_write(isp->addr, IOSAPIC_IRDT_ENTRY_HI(vi->irqline), dp1); | |
564 | ||
565 | /* Read the window register to flush the writes down to HW */ | |
566 | dp1 = readl(isp->addr+IOSAPIC_REG_WINDOW); | |
567 | } | |
568 | ||
569 | /* | |
570 | ** set_irt prepares the data (dp0, dp1) according to the vector_info | |
571 | ** and target cpu (id_eid). dp0/dp1 are then used to program I/O SAPIC | |
572 | ** IRdT for the given "vector" (aka IRQ line). | |
573 | */ | |
574 | static void | |
575 | iosapic_set_irt_data( struct vector_info *vi, u32 *dp0, u32 *dp1) | |
576 | { | |
577 | u32 mode = 0; | |
578 | struct irt_entry *p = vi->irte; | |
579 | ||
580 | if ((p->polarity_trigger & IRT_PO_MASK) == IRT_ACTIVE_LO) | |
581 | mode |= IOSAPIC_IRDT_PO_LOW; | |
582 | ||
583 | if (((p->polarity_trigger >> IRT_EL_SHIFT) & IRT_EL_MASK) == IRT_LEVEL_TRIG) | |
584 | mode |= IOSAPIC_IRDT_LEVEL_TRIG; | |
585 | ||
586 | /* | |
587 | ** IA64 REVISIT | |
588 | ** PA doesn't support EXTINT or LPRIO bits. | |
589 | */ | |
590 | ||
591 | *dp0 = mode | (u32) vi->txn_data; | |
592 | ||
593 | /* | |
594 | ** Extracting id_eid isn't a real clean way of getting it. | |
595 | ** But the encoding is the same for both PA and IA64 platforms. | |
596 | */ | |
597 | if (is_pdc_pat()) { | |
598 | /* | |
599 | ** PAT PDC just hands it to us "right". | |
600 | ** txn_addr comes from cpu_data[x].txn_addr. | |
601 | */ | |
602 | *dp1 = (u32) (vi->txn_addr); | |
603 | } else { | |
604 | /* | |
605 | ** eg if base_addr == 0xfffa0000), | |
606 | ** we want to get 0xa0ff0000. | |
607 | ** | |
608 | ** eid 0x0ff00000 -> 0x00ff0000 | |
609 | ** id 0x000ff000 -> 0xff000000 | |
610 | */ | |
611 | *dp1 = (((u32)vi->txn_addr & 0x0ff00000) >> 4) | | |
612 | (((u32)vi->txn_addr & 0x000ff000) << 12); | |
613 | } | |
614 | DBG_IRT("iosapic_set_irt_data(): 0x%x 0x%x\n", *dp0, *dp1); | |
615 | } | |
616 | ||
617 | ||
f3d46059 | 618 | static void iosapic_mask_irq(unsigned int irq) |
1da177e4 LT |
619 | { |
620 | unsigned long flags; | |
ba20085c | 621 | struct vector_info *vi = get_irq_chip_data(irq); |
1da177e4 LT |
622 | u32 d0, d1; |
623 | ||
624 | spin_lock_irqsave(&iosapic_lock, flags); | |
625 | iosapic_rd_irt_entry(vi, &d0, &d1); | |
626 | d0 |= IOSAPIC_IRDT_ENABLE; | |
627 | iosapic_wr_irt_entry(vi, d0, d1); | |
628 | spin_unlock_irqrestore(&iosapic_lock, flags); | |
629 | } | |
630 | ||
f3d46059 | 631 | static void iosapic_unmask_irq(unsigned int irq) |
1da177e4 | 632 | { |
ba20085c | 633 | struct vector_info *vi = get_irq_chip_data(irq); |
1da177e4 LT |
634 | u32 d0, d1; |
635 | ||
636 | /* data is initialized by fixup_irq */ | |
637 | WARN_ON(vi->txn_irq == 0); | |
638 | ||
639 | iosapic_set_irt_data(vi, &d0, &d1); | |
640 | iosapic_wr_irt_entry(vi, d0, d1); | |
641 | ||
642 | #ifdef DEBUG_IOSAPIC_IRT | |
643 | { | |
644 | u32 *t = (u32 *) ((ulong) vi->eoi_addr & ~0xffUL); | |
645 | printk("iosapic_enable_irq(): regs %p", vi->eoi_addr); | |
646 | for ( ; t < vi->eoi_addr; t++) | |
647 | printk(" %x", readl(t)); | |
648 | printk("\n"); | |
649 | } | |
650 | ||
651 | printk("iosapic_enable_irq(): sel "); | |
652 | { | |
653 | struct iosapic_info *isp = vi->iosapic; | |
654 | ||
655 | for (d0=0x10; d0<0x1e; d0++) { | |
656 | d1 = iosapic_read(isp->addr, d0); | |
657 | printk(" %x", d1); | |
658 | } | |
659 | } | |
660 | printk("\n"); | |
661 | #endif | |
662 | ||
663 | /* | |
664 | * Issuing I/O SAPIC an EOI causes an interrupt IFF IRQ line is | |
665 | * asserted. IRQ generally should not be asserted when a driver | |
666 | * enables their IRQ. It can lead to "interesting" race conditions | |
667 | * in the driver initialization sequence. | |
668 | */ | |
669 | DBG(KERN_DEBUG "enable_irq(%d): eoi(%p, 0x%x)\n", irq, | |
670 | vi->eoi_addr, vi->eoi_data); | |
671 | iosapic_eoi(vi->eoi_addr, vi->eoi_data); | |
4d4f681d | 672 | cpu_eoi_irq(irq); |
1da177e4 LT |
673 | } |
674 | ||
c2ab64d0 | 675 | #ifdef CONFIG_SMP |
d5dedd45 | 676 | static int iosapic_set_affinity_irq(unsigned int irq, |
0de26520 | 677 | const struct cpumask *dest) |
c2ab64d0 | 678 | { |
ba20085c | 679 | struct vector_info *vi = get_irq_chip_data(irq); |
c2ab64d0 JB |
680 | u32 d0, d1, dummy_d0; |
681 | unsigned long flags; | |
8b6649c5 | 682 | int dest_cpu; |
c2ab64d0 | 683 | |
8b6649c5 KM |
684 | dest_cpu = cpu_check_affinity(irq, dest); |
685 | if (dest_cpu < 0) | |
d5dedd45 | 686 | return -1; |
c2ab64d0 | 687 | |
2d6d79bb | 688 | cpumask_copy(irq_desc[irq].affinity, cpumask_of(dest_cpu)); |
8b6649c5 | 689 | vi->txn_addr = txn_affinity_addr(irq, dest_cpu); |
c2ab64d0 JB |
690 | |
691 | spin_lock_irqsave(&iosapic_lock, flags); | |
692 | /* d1 contains the destination CPU, so only want to set that | |
693 | * entry */ | |
694 | iosapic_rd_irt_entry(vi, &d0, &d1); | |
695 | iosapic_set_irt_data(vi, &dummy_d0, &d1); | |
696 | iosapic_wr_irt_entry(vi, d0, d1); | |
697 | spin_unlock_irqrestore(&iosapic_lock, flags); | |
d5dedd45 YL |
698 | |
699 | return 0; | |
c2ab64d0 JB |
700 | } |
701 | #endif | |
702 | ||
dfe07565 | 703 | static struct irq_chip iosapic_interrupt_type = { |
f3d46059 KM |
704 | .name = "IO-SAPIC-level", |
705 | .unmask = iosapic_unmask_irq, | |
706 | .mask = iosapic_mask_irq, | |
707 | .ack = cpu_ack_irq, | |
c2ab64d0 JB |
708 | #ifdef CONFIG_SMP |
709 | .set_affinity = iosapic_set_affinity_irq, | |
710 | #endif | |
1da177e4 LT |
711 | }; |
712 | ||
713 | int iosapic_fixup_irq(void *isi_obj, struct pci_dev *pcidev) | |
714 | { | |
715 | struct iosapic_info *isi = isi_obj; | |
716 | struct irt_entry *irte = NULL; /* only used if PAT PDC */ | |
717 | struct vector_info *vi; | |
718 | int isi_line; /* line used by device */ | |
719 | ||
720 | if (!isi) { | |
721 | printk(KERN_WARNING MODULE_NAME ": hpa not registered for %s\n", | |
722 | pci_name(pcidev)); | |
723 | return -1; | |
724 | } | |
725 | ||
726 | #ifdef CONFIG_SUPERIO | |
727 | /* | |
728 | * HACK ALERT! (non-compliant PCI device support) | |
729 | * | |
730 | * All SuckyIO interrupts are routed through the PIC's on function 1. | |
731 | * But SuckyIO OHCI USB controller gets an IRT entry anyway because | |
732 | * it advertises INT D for INT_PIN. Use that IRT entry to get the | |
733 | * SuckyIO interrupt routing for PICs on function 1 (*BLEECCHH*). | |
734 | */ | |
735 | if (is_superio_device(pcidev)) { | |
736 | /* We must call superio_fixup_irq() to register the pdev */ | |
737 | pcidev->irq = superio_fixup_irq(pcidev); | |
738 | ||
739 | /* Don't return if need to program the IOSAPIC's IRT... */ | |
740 | if (PCI_FUNC(pcidev->devfn) != SUPERIO_USB_FN) | |
741 | return pcidev->irq; | |
742 | } | |
743 | #endif /* CONFIG_SUPERIO */ | |
744 | ||
745 | /* lookup IRT entry for isi/slot/pin set */ | |
746 | irte = iosapic_xlate_pin(isi, pcidev); | |
747 | if (!irte) { | |
748 | printk("iosapic: no IRTE for %s (IRQ not connected?)\n", | |
749 | pci_name(pcidev)); | |
750 | return -1; | |
751 | } | |
752 | DBG_IRT("iosapic_fixup_irq(): irte %p %x %x %x %x %x %x %x %x\n", | |
753 | irte, | |
754 | irte->entry_type, | |
755 | irte->entry_length, | |
756 | irte->polarity_trigger, | |
757 | irte->src_bus_irq_devno, | |
758 | irte->src_bus_id, | |
759 | irte->src_seg_id, | |
760 | irte->dest_iosapic_intin, | |
761 | (u32) irte->dest_iosapic_addr); | |
762 | isi_line = irte->dest_iosapic_intin; | |
763 | ||
764 | /* get vector info for this input line */ | |
765 | vi = isi->isi_vector + isi_line; | |
766 | DBG_IRT("iosapic_fixup_irq: line %d vi 0x%p\n", isi_line, vi); | |
767 | ||
768 | /* If this IRQ line has already been setup, skip it */ | |
769 | if (vi->irte) | |
770 | goto out; | |
771 | ||
772 | vi->irte = irte; | |
773 | ||
774 | /* | |
775 | * Allocate processor IRQ | |
776 | * | |
777 | * XXX/FIXME The txn_alloc_irq() code and related code should be | |
778 | * moved to enable_irq(). That way we only allocate processor IRQ | |
779 | * bits for devices that actually have drivers claiming them. | |
780 | * Right now we assign an IRQ to every PCI device present, | |
781 | * regardless of whether it's used or not. | |
782 | */ | |
783 | vi->txn_irq = txn_alloc_irq(8); | |
784 | ||
785 | if (vi->txn_irq < 0) | |
786 | panic("I/O sapic: couldn't get TXN IRQ\n"); | |
787 | ||
788 | /* enable_irq() will use txn_* to program IRdT */ | |
789 | vi->txn_addr = txn_alloc_addr(vi->txn_irq); | |
790 | vi->txn_data = txn_alloc_data(vi->txn_irq); | |
791 | ||
792 | vi->eoi_addr = isi->addr + IOSAPIC_REG_EOI; | |
793 | vi->eoi_data = cpu_to_le32(vi->txn_data); | |
794 | ||
795 | cpu_claim_irq(vi->txn_irq, &iosapic_interrupt_type, vi); | |
796 | ||
797 | out: | |
798 | pcidev->irq = vi->txn_irq; | |
799 | ||
800 | DBG_IRT("iosapic_fixup_irq() %d:%d %x %x line %d irq %d\n", | |
801 | PCI_SLOT(pcidev->devfn), PCI_FUNC(pcidev->devfn), | |
802 | pcidev->vendor, pcidev->device, isi_line, pcidev->irq); | |
803 | ||
804 | return pcidev->irq; | |
805 | } | |
806 | ||
807 | ||
808 | /* | |
809 | ** squirrel away the I/O Sapic Version | |
810 | */ | |
811 | static unsigned int | |
812 | iosapic_rd_version(struct iosapic_info *isi) | |
813 | { | |
814 | return iosapic_read(isi->addr, IOSAPIC_REG_VERSION); | |
815 | } | |
816 | ||
817 | ||
818 | /* | |
819 | ** iosapic_register() is called by "drivers" with an integrated I/O SAPIC. | |
820 | ** Caller must be certain they have an I/O SAPIC and know its MMIO address. | |
821 | ** | |
822 | ** o allocate iosapic_info and add it to the list | |
823 | ** o read iosapic version and squirrel that away | |
824 | ** o read size of IRdT. | |
825 | ** o allocate and initialize isi_vector[] | |
826 | ** o allocate irq region | |
827 | */ | |
828 | void *iosapic_register(unsigned long hpa) | |
829 | { | |
830 | struct iosapic_info *isi = NULL; | |
831 | struct irt_entry *irte = irt_cell; | |
832 | struct vector_info *vip; | |
833 | int cnt; /* track how many entries we've looked at */ | |
834 | ||
835 | /* | |
836 | * Astro based platforms can only support PCI OLARD if they implement | |
837 | * PAT PDC. Legacy PDC omits LBAs with no PCI devices from the IRT. | |
838 | * Search the IRT and ignore iosapic's which aren't in the IRT. | |
839 | */ | |
840 | for (cnt=0; cnt < irt_num_entry; cnt++, irte++) { | |
841 | WARN_ON(IRT_IOSAPIC_TYPE != irte->entry_type); | |
842 | if (COMPARE_IRTE_ADDR(irte, hpa)) | |
843 | break; | |
844 | } | |
845 | ||
846 | if (cnt >= irt_num_entry) { | |
847 | DBG("iosapic_register() ignoring 0x%lx (NOT FOUND)\n", hpa); | |
848 | return NULL; | |
849 | } | |
850 | ||
5cbded58 | 851 | isi = kzalloc(sizeof(struct iosapic_info), GFP_KERNEL); |
1da177e4 LT |
852 | if (!isi) { |
853 | BUG(); | |
854 | return NULL; | |
855 | } | |
856 | ||
5076c158 | 857 | isi->addr = ioremap_nocache(hpa, 4096); |
1da177e4 LT |
858 | isi->isi_hpa = hpa; |
859 | isi->isi_version = iosapic_rd_version(isi); | |
860 | isi->isi_num_vectors = IOSAPIC_IRDT_MAX_ENTRY(isi->isi_version) + 1; | |
861 | ||
f8301041 JP |
862 | vip = isi->isi_vector = kcalloc(isi->isi_num_vectors, |
863 | sizeof(struct vector_info), GFP_KERNEL); | |
1da177e4 LT |
864 | if (vip == NULL) { |
865 | kfree(isi); | |
866 | return NULL; | |
867 | } | |
868 | ||
1da177e4 LT |
869 | for (cnt=0; cnt < isi->isi_num_vectors; cnt++, vip++) { |
870 | vip->irqline = (unsigned char) cnt; | |
871 | vip->iosapic = isi; | |
872 | } | |
873 | return isi; | |
874 | } | |
875 | ||
876 | ||
877 | #ifdef DEBUG_IOSAPIC | |
878 | ||
879 | static void | |
880 | iosapic_prt_irt(void *irt, long num_entry) | |
881 | { | |
882 | unsigned int i, *irp = (unsigned int *) irt; | |
883 | ||
884 | ||
885 | printk(KERN_DEBUG MODULE_NAME ": Interrupt Routing Table (%lx entries)\n", num_entry); | |
886 | ||
887 | for (i=0; i<num_entry; i++, irp += 4) { | |
888 | printk(KERN_DEBUG "%p : %2d %.8x %.8x %.8x %.8x\n", | |
889 | irp, i, irp[0], irp[1], irp[2], irp[3]); | |
890 | } | |
891 | } | |
892 | ||
893 | ||
894 | static void | |
895 | iosapic_prt_vi(struct vector_info *vi) | |
896 | { | |
897 | printk(KERN_DEBUG MODULE_NAME ": vector_info[%d] is at %p\n", vi->irqline, vi); | |
898 | printk(KERN_DEBUG "\t\tstatus: %.4x\n", vi->status); | |
899 | printk(KERN_DEBUG "\t\ttxn_irq: %d\n", vi->txn_irq); | |
900 | printk(KERN_DEBUG "\t\ttxn_addr: %lx\n", vi->txn_addr); | |
901 | printk(KERN_DEBUG "\t\ttxn_data: %lx\n", vi->txn_data); | |
902 | printk(KERN_DEBUG "\t\teoi_addr: %p\n", vi->eoi_addr); | |
903 | printk(KERN_DEBUG "\t\teoi_data: %x\n", vi->eoi_data); | |
904 | } | |
905 | ||
906 | ||
907 | static void | |
908 | iosapic_prt_isi(struct iosapic_info *isi) | |
909 | { | |
910 | printk(KERN_DEBUG MODULE_NAME ": io_sapic_info at %p\n", isi); | |
911 | printk(KERN_DEBUG "\t\tisi_hpa: %lx\n", isi->isi_hpa); | |
912 | printk(KERN_DEBUG "\t\tisi_status: %x\n", isi->isi_status); | |
913 | printk(KERN_DEBUG "\t\tisi_version: %x\n", isi->isi_version); | |
914 | printk(KERN_DEBUG "\t\tisi_vector: %p\n", isi->isi_vector); | |
915 | } | |
916 | #endif /* DEBUG_IOSAPIC */ |