1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 ** I/O Sapic Driver - PCI interrupt line support
4 **
5 ** (c) Copyright 1999 Grant Grundler
6 ** (c) Copyright 1999 Hewlett-Packard Company
7 **
8 **
9 ** The I/O sapic driver manages the Interrupt Redirection Table which is
10 ** the control logic to convert PCI line based interrupts into a Message
11 ** Signaled Interrupt (aka Transaction Based Interrupt, TBI).
12 **
13 ** Acronyms
14 ** --------
15 ** HPA Hard Physical Address (aka MMIO address)
16 ** IRQ Interrupt ReQuest. Implies Line based interrupt.
17 ** IRT Interrupt Routing Table (provided by PAT firmware)
18 ** IRdT Interrupt Redirection Table. IRQ line to TXN ADDR/DATA
19 ** table which is implemented in I/O SAPIC.
20 ** ISR Interrupt Service Routine. aka Interrupt handler.
21 ** MSI Message Signaled Interrupt. PCI 2.2 functionality.
22 ** aka Transaction Based Interrupt (or TBI).
23 ** PA Precision Architecture. HP's RISC architecture.
24 ** RISC Reduced Instruction Set Computer.
25 **
26 **
27 ** What's a Message Signalled Interrupt?
28 ** -------------------------------------
29 ** MSI is a write transaction which targets a processor and is similar
30 ** to a processor write to memory or MMIO. MSIs can be generated by I/O
31 ** devices as well as processors and require *architecture* to work.
32 **
33 ** PA only supports MSI. So I/O subsystems must either natively generate
34 ** MSIs (e.g. GSC or HP-PB) or convert line based interrupts into MSIs
35 ** (e.g. PCI and EISA). IA64 supports MSIs via a "local SAPIC" which
36 ** acts on behalf of a processor.
37 **
38 ** MSI allows any I/O device to interrupt any processor. This makes
39 ** load balancing of the interrupt processing possible on an SMP platform.
40 ** Interrupts are also ordered WRT to DMA data. It's possible on I/O
41 ** coherent systems to completely eliminate PIO reads from the interrupt
42 ** path. The device and driver must be designed and implemented to
43 ** guarantee all DMA has been issued (issues about atomicity here)
44 ** before the MSI is issued. I/O status can then safely be read from
45 ** DMA'd data by the ISR.
46 **
47 **
48 ** PA Firmware
49 ** -----------
50 ** PA-RISC platforms have two fundamentally different types of firmware.
51 ** For PCI devices, "Legacy" PDC initializes the "INTERRUPT_LINE" register
52 ** and BARs similar to a traditional PC BIOS.
53 ** The newer "PAT" firmware supports PDC calls which return tables.
54 ** PAT firmware only initializes the PCI Console and Boot interface.
55 ** With these tables, the OS can program all other PCI devices.
56 **
57 ** One such PAT PDC call returns the "Interrupt Routing Table" (IRT).
58 ** The IRT maps each PCI slot's INTA-D "output" line to an I/O SAPIC
59 ** input line. If the IRT is not available, this driver assumes
60 ** INTERRUPT_LINE register has been programmed by firmware. The latter
61 ** case also means online addition of PCI cards can NOT be supported
62 ** even if HW support is present.
63 **
64 ** All platforms with PAT firmware to date (Oct 1999) use one Interrupt
65 ** Routing Table for the entire platform.
66 **
67 ** Where's the iosapic?
68 ** --------------------
69 ** I/O sapic is part of the "Core Electronics Complex". And on HP platforms
70 ** it's integrated as part of the PCI bus adapter, "lba". So no bus walk
71 ** will discover I/O Sapic. I/O Sapic driver learns about each device
72 ** when lba driver advertises the presence of the I/O sapic by calling
73 ** iosapic_register().
74 **
75 **
76 ** IRQ handling notes
77 ** ------------------
78 ** The IO-SAPIC can indicate to the CPU which interrupt was asserted.
79 ** So, unlike the GSC-ASIC and Dino, we allocate one CPU interrupt per
80 ** IO-SAPIC interrupt and call the device driver's handler directly.
81 ** The IO-SAPIC driver hijacks the CPU interrupt handler so it can
82 ** issue the End Of Interrupt command to the IO-SAPIC.
83 **
84 ** Overview of exported iosapic functions
85 ** --------------------------------------
86 ** (caveat: code isn't finished yet - this is just the plan)
87 **
88 ** iosapic_init:
89 ** o initialize globals (lock, etc)
90 ** o try to read IRT. Presence of IRT determines if this is
91 ** a PAT platform or not.
92 **
93 ** iosapic_register():
94 ** o create iosapic_info instance data structure
95 ** o allocate vector_info array for this iosapic
96 ** o initialize vector_info - read corresponding IRdT?
97 **
98 ** iosapic_xlate_pin: (only called by fixup_irq for PAT platform)
99 ** o intr_pin = read cfg (INTERRUPT_PIN);
100 ** o if (device under PCI-PCI bridge)
101 ** translate slot/pin
102 **
103 ** iosapic_fixup_irq:
104 ** o if PAT platform (IRT present)
105 ** intr_pin = iosapic_xlate_pin(isi,pcidev):
106 ** intr_line = find IRT entry(isi, PCI_SLOT(pcidev), intr_pin)
107 ** save IRT entry into vector_info later
108 ** write cfg INTERRUPT_LINE (with intr_line)?
109 ** else
110 ** intr_line = pcidev->irq
111 ** IRT pointer = NULL
112 ** endif
113 ** o locate vector_info (needs: isi, intr_line)
114 ** o allocate processor "irq" and get txn_addr/data
115 ** o request_irq(processor_irq, iosapic_interrupt, vector_info,...)
116 **
117 ** iosapic_enable_irq:
118 ** o clear any pending IRQ on that line
119 ** o enable IRdT - call enable_irq(vector[line]->processor_irq)
120 ** o write EOI in case line is already asserted.
121 **
122 ** iosapic_disable_irq:
123 ** o disable IRdT - call disable_irq(vector[line]->processor_irq)
124 */
125
126 #include <linux/pci.h>
127
128 #include <asm/pdc.h>
129 #include <asm/pdcpat.h>
130 #ifdef CONFIG_SUPERIO
131 #include <asm/superio.h>
132 #endif
133
134 #include <asm/ropes.h>
135 #include "iosapic_private.h"
136
137 #define MODULE_NAME "iosapic"
138
139 /* "local" compile flags */
140 #undef PCI_BRIDGE_FUNCS
141 #undef DEBUG_IOSAPIC
142 #undef DEBUG_IOSAPIC_IRT
143
144
145 #ifdef DEBUG_IOSAPIC
146 #define DBG(x...) printk(x)
147 #else /* DEBUG_IOSAPIC */
148 #define DBG(x...)
149 #endif /* DEBUG_IOSAPIC */
150
151 #ifdef DEBUG_IOSAPIC_IRT
152 #define DBG_IRT(x...) printk(x)
153 #else
154 #define DBG_IRT(x...)
155 #endif
156
157 #ifdef CONFIG_64BIT
158 #define COMPARE_IRTE_ADDR(irte, hpa) ((irte)->dest_iosapic_addr == (hpa))
159 #else
160 #define COMPARE_IRTE_ADDR(irte, hpa) \
161 ((irte)->dest_iosapic_addr == ((hpa) | 0xffffffff00000000ULL))
162 #endif
163
164 #define IOSAPIC_REG_SELECT 0x00
165 #define IOSAPIC_REG_WINDOW 0x10
166 #define IOSAPIC_REG_EOI 0x40
167
168 #define IOSAPIC_REG_VERSION 0x1
169
170 #define IOSAPIC_IRDT_ENTRY(idx) (0x10+(idx)*2)
171 #define IOSAPIC_IRDT_ENTRY_HI(idx) (0x11+(idx)*2)
172
iosapic_read(void __iomem * iosapic,unsigned int reg)173 static inline unsigned int iosapic_read(void __iomem *iosapic, unsigned int reg)
174 {
175 writel(reg, iosapic + IOSAPIC_REG_SELECT);
176 return readl(iosapic + IOSAPIC_REG_WINDOW);
177 }
178
iosapic_write(void __iomem * iosapic,unsigned int reg,u32 val)179 static inline void iosapic_write(void __iomem *iosapic, unsigned int reg, u32 val)
180 {
181 writel(reg, iosapic + IOSAPIC_REG_SELECT);
182 writel(val, iosapic + IOSAPIC_REG_WINDOW);
183 }
184
185 #define IOSAPIC_VERSION_MASK 0x000000ff
186 #define IOSAPIC_VERSION(ver) ((int) (ver & IOSAPIC_VERSION_MASK))
187
188 #define IOSAPIC_MAX_ENTRY_MASK 0x00ff0000
189 #define IOSAPIC_MAX_ENTRY_SHIFT 0x10
190 #define IOSAPIC_IRDT_MAX_ENTRY(ver) \
191 (int) (((ver) & IOSAPIC_MAX_ENTRY_MASK) >> IOSAPIC_MAX_ENTRY_SHIFT)
192
193 /* bits in the "low" I/O Sapic IRdT entry */
194 #define IOSAPIC_IRDT_ENABLE 0x10000
195 #define IOSAPIC_IRDT_PO_LOW 0x02000
196 #define IOSAPIC_IRDT_LEVEL_TRIG 0x08000
197 #define IOSAPIC_IRDT_MODE_LPRI 0x00100
198
199 /* bits in the "high" I/O Sapic IRdT entry */
200 #define IOSAPIC_IRDT_ID_EID_SHIFT 0x10
201
202
203 static DEFINE_SPINLOCK(iosapic_lock);
204
iosapic_eoi(void __iomem * addr,unsigned int data)205 static inline void iosapic_eoi(void __iomem *addr, unsigned int data)
206 {
207 __raw_writel(data, addr);
208 }
209
210 /*
211 ** REVISIT: future platforms may have more than one IRT.
212 ** If so, the following three fields form a structure which
213 ** then be linked into a list. Names are chosen to make searching
214 ** for them easy - not necessarily accurate (eg "cell").
215 **
216 ** Alternative: iosapic_info could point to the IRT it's in.
217 ** iosapic_register() could search a list of IRT's.
218 */
219 static struct irt_entry *irt_cell;
220 static size_t irt_num_entry;
221
iosapic_alloc_irt(int num_entries)222 static struct irt_entry *iosapic_alloc_irt(int num_entries)
223 {
224 return kcalloc(num_entries, sizeof(struct irt_entry), GFP_KERNEL);
225 }
226
227 /**
228 * iosapic_load_irt - Fill in the interrupt routing table
229 * @cell_num: The cell number of the CPU we're currently executing on
230 * @irt: The address to place the new IRT at
231 * @return The number of entries found
232 *
233 * The "Get PCI INT Routing Table Size" option returns the number of
234 * entries in the PCI interrupt routing table for the cell specified
235 * in the cell_number argument. The cell number must be for a cell
236 * within the caller's protection domain.
237 *
238 * The "Get PCI INT Routing Table" option returns, for the cell
239 * specified in the cell_number argument, the PCI interrupt routing
240 * table in the caller allocated memory pointed to by mem_addr.
241 * We assume the IRT only contains entries for I/O SAPIC and
242 * calculate the size based on the size of I/O sapic entries.
243 *
244 * The PCI interrupt routing table entry format is derived from the
245 * IA64 SAL Specification 2.4. The PCI interrupt routing table defines
246 * the routing of PCI interrupt signals between the PCI device output
247 * "pins" and the IO SAPICs' input "lines" (including core I/O PCI
248 * devices). This table does NOT include information for devices/slots
249 * behind PCI to PCI bridges. See PCI to PCI Bridge Architecture Spec.
250 * for the architected method of routing of IRQ's behind PPB's.
251 */
252
253
254 static int __init
iosapic_load_irt(unsigned long cell_num,struct irt_entry ** irt)255 iosapic_load_irt(unsigned long cell_num, struct irt_entry **irt)
256 {
257 long status; /* PDC return value status */
258 struct irt_entry *table; /* start of interrupt routing tbl */
259 unsigned long num_entries = 0UL;
260
261 BUG_ON(!irt);
262
263 if (is_pdc_pat()) {
264 /* Use pat pdc routine to get interrupt routing table size */
265 DBG("calling get_irt_size (cell %ld)\n", cell_num);
266 status = pdc_pat_get_irt_size(&num_entries, cell_num);
267 DBG("get_irt_size: %ld\n", status);
268
269 BUG_ON(status != PDC_OK);
270 BUG_ON(num_entries == 0);
271
272 /*
273 ** allocate memory for interrupt routing table
274 ** This interface isn't really right. We are assuming
275 ** the contents of the table are exclusively
276 ** for I/O sapic devices.
277 */
278 table = iosapic_alloc_irt(num_entries);
279 if (table == NULL) {
280 printk(KERN_WARNING MODULE_NAME ": read_irt : can "
281 "not alloc mem for IRT\n");
282 return 0;
283 }
284
285 /* get PCI INT routing table */
286 status = pdc_pat_get_irt(table, cell_num);
287 DBG("pdc_pat_get_irt: %ld\n", status);
288 WARN_ON(status != PDC_OK);
289 } else {
290 /*
291 ** C3000/J5000 (and similar) platforms with Sprockets PDC
292 ** will return exactly one IRT for all iosapics.
293 ** So if we have one, don't need to get it again.
294 */
295 if (irt_cell)
296 return 0;
297
298 /* Should be using the Elroy's HPA, but it's ignored anyway */
299 status = pdc_pci_irt_size(&num_entries, 0);
300 DBG("pdc_pci_irt_size: %ld\n", status);
301
302 if (status != PDC_OK) {
303 /* Not a "legacy" system with I/O SAPIC either */
304 return 0;
305 }
306
307 BUG_ON(num_entries == 0);
308
309 table = iosapic_alloc_irt(num_entries);
310 if (!table) {
311 printk(KERN_WARNING MODULE_NAME ": read_irt : can "
312 "not alloc mem for IRT\n");
313 return 0;
314 }
315
316 /* HPA ignored by this call too. */
317 status = pdc_pci_irt(num_entries, 0, table);
318 BUG_ON(status != PDC_OK);
319 }
320
321 /* return interrupt table address */
322 *irt = table;
323
324 #ifdef DEBUG_IOSAPIC_IRT
325 {
326 struct irt_entry *p = table;
327 int i;
328
329 printk(MODULE_NAME " Interrupt Routing Table (cell %ld)\n", cell_num);
330 printk(MODULE_NAME " start = 0x%p num_entries %ld entry_size %d\n",
331 table,
332 num_entries,
333 (int) sizeof(struct irt_entry));
334
335 for (i = 0 ; i < num_entries ; i++, p++) {
336 printk(MODULE_NAME " %02x %02x %02x %02x %02x %02x %02x %02x %08x%08x\n",
337 p->entry_type, p->entry_length, p->interrupt_type,
338 p->polarity_trigger, p->src_bus_irq_devno, p->src_bus_id,
339 p->src_seg_id, p->dest_iosapic_intin,
340 ((u32 *) p)[2],
341 ((u32 *) p)[3]
342 );
343 }
344 }
345 #endif /* DEBUG_IOSAPIC_IRT */
346
347 return num_entries;
348 }
349
350
351
iosapic_init(void)352 void __init iosapic_init(void)
353 {
354 unsigned long cell = 0;
355
356 DBG("iosapic_init()\n");
357
358 #ifdef __LP64__
359 if (is_pdc_pat()) {
360 int status;
361 struct pdc_pat_cell_num cell_info;
362
363 status = pdc_pat_cell_get_number(&cell_info);
364 if (status == PDC_OK) {
365 cell = cell_info.cell_num;
366 }
367 }
368 #endif
369
370 /* get interrupt routing table for this cell */
371 irt_num_entry = iosapic_load_irt(cell, &irt_cell);
372 if (irt_num_entry == 0)
373 irt_cell = NULL; /* old PDC w/o iosapic */
374 }
375
376
377 /*
378 ** Return the IRT entry in case we need to look something else up.
379 */
380 static struct irt_entry *
irt_find_irqline(struct iosapic_info * isi,u8 slot,u8 intr_pin)381 irt_find_irqline(struct iosapic_info *isi, u8 slot, u8 intr_pin)
382 {
383 struct irt_entry *i = irt_cell;
384 int cnt; /* track how many entries we've looked at */
385 u8 irq_devno = (slot << IRT_DEV_SHIFT) | (intr_pin-1);
386
387 DBG_IRT("irt_find_irqline() SLOT %d pin %d\n", slot, intr_pin);
388
389 for (cnt=0; cnt < irt_num_entry; cnt++, i++) {
390
391 /*
392 ** Validate: entry_type, entry_length, interrupt_type
393 **
394 ** Difference between validate vs compare is the former
395 ** should print debug info and is not expected to "fail"
396 ** on current platforms.
397 */
398 if (i->entry_type != IRT_IOSAPIC_TYPE) {
399 DBG_IRT(KERN_WARNING MODULE_NAME ":find_irqline(0x%p): skipping entry %d type %d\n", i, cnt, i->entry_type);
400 continue;
401 }
402
403 if (i->entry_length != IRT_IOSAPIC_LENGTH) {
404 DBG_IRT(KERN_WARNING MODULE_NAME ":find_irqline(0x%p): skipping entry %d length %d\n", i, cnt, i->entry_length);
405 continue;
406 }
407
408 if (i->interrupt_type != IRT_VECTORED_INTR) {
409 DBG_IRT(KERN_WARNING MODULE_NAME ":find_irqline(0x%p): skipping entry %d interrupt_type %d\n", i, cnt, i->interrupt_type);
410 continue;
411 }
412
413 if (!COMPARE_IRTE_ADDR(i, isi->isi_hpa))
414 continue;
415
416 if ((i->src_bus_irq_devno & IRT_IRQ_DEVNO_MASK) != irq_devno)
417 continue;
418
419 /*
420 ** Ignore: src_bus_id and rc_seg_id correlate with
421 ** iosapic_info->isi_hpa on HP platforms.
422 ** If needed, pass in "PFA" (aka config space addr)
423 ** instead of slot.
424 */
425
426 /* Found it! */
427 return i;
428 }
429
430 printk(KERN_WARNING MODULE_NAME ": 0x%lx : no IRT entry for slot %d, pin %d\n",
431 isi->isi_hpa, slot, intr_pin);
432 return NULL;
433 }
434
435
436 /*
437 ** xlate_pin() supports the skewing of IRQ lines done by subsidiary bridges.
438 ** Legacy PDC already does this translation for us and stores it in INTR_LINE.
439 **
440 ** PAT PDC needs to basically do what legacy PDC does:
441 ** o read PIN
442 ** o adjust PIN in case device is "behind" a PPB
443 ** (eg 4-port 100BT and SCSI/LAN "Combo Card")
444 ** o convert slot/pin to I/O SAPIC input line.
445 **
446 ** HP platforms only support:
447 ** o one level of skewing for any number of PPBs
448 ** o only support PCI-PCI Bridges.
449 */
450 static struct irt_entry *
iosapic_xlate_pin(struct iosapic_info * isi,struct pci_dev * pcidev)451 iosapic_xlate_pin(struct iosapic_info *isi, struct pci_dev *pcidev)
452 {
453 u8 intr_pin, intr_slot;
454
455 pci_read_config_byte(pcidev, PCI_INTERRUPT_PIN, &intr_pin);
456
457 DBG_IRT("iosapic_xlate_pin(%s) SLOT %d pin %d\n",
458 pcidev->slot_name, PCI_SLOT(pcidev->devfn), intr_pin);
459
460 if (intr_pin == 0) {
461 /* The device does NOT support/use IRQ lines. */
462 return NULL;
463 }
464
465 /* Check if pcidev behind a PPB */
466 if (pcidev->bus->parent) {
467 /* Convert pcidev INTR_PIN into something we
468 ** can lookup in the IRT.
469 */
470 #ifdef PCI_BRIDGE_FUNCS
471 /*
472 ** Proposal #1:
473 **
474 ** call implementation specific translation function
475 ** This is architecturally "cleaner". HP-UX doesn't
476 ** support other secondary bus types (eg. E/ISA) directly.
477 ** May be needed for other processor (eg IA64) architectures
478 ** or by some ambitous soul who wants to watch TV.
479 */
480 if (pci_bridge_funcs->xlate_intr_line) {
481 intr_pin = pci_bridge_funcs->xlate_intr_line(pcidev);
482 }
483 #else /* PCI_BRIDGE_FUNCS */
484 struct pci_bus *p = pcidev->bus;
485 /*
486 ** Proposal #2:
487 ** The "pin" is skewed ((pin + dev - 1) % 4).
488 **
489 ** This isn't very clean since I/O SAPIC must assume:
490 ** - all platforms only have PCI busses.
491 ** - only PCI-PCI bridge (eg not PCI-EISA, PCI-PCMCIA)
492 ** - IRQ routing is only skewed once regardless of
493 ** the number of PPB's between iosapic and device.
494 ** (Bit3 expansion chassis follows this rule)
495 **
496 ** Advantage is it's really easy to implement.
497 */
498 intr_pin = pci_swizzle_interrupt_pin(pcidev, intr_pin);
499 #endif /* PCI_BRIDGE_FUNCS */
500
501 /*
502 * Locate the host slot of the PPB.
503 */
504 while (p->parent->parent)
505 p = p->parent;
506
507 intr_slot = PCI_SLOT(p->self->devfn);
508 } else {
509 intr_slot = PCI_SLOT(pcidev->devfn);
510 }
511 DBG_IRT("iosapic_xlate_pin: bus %d slot %d pin %d\n",
512 pcidev->bus->busn_res.start, intr_slot, intr_pin);
513
514 return irt_find_irqline(isi, intr_slot, intr_pin);
515 }
516
iosapic_rd_irt_entry(struct vector_info * vi,u32 * dp0,u32 * dp1)517 static void iosapic_rd_irt_entry(struct vector_info *vi , u32 *dp0, u32 *dp1)
518 {
519 struct iosapic_info *isp = vi->iosapic;
520 u8 idx = vi->irqline;
521
522 *dp0 = iosapic_read(isp->addr, IOSAPIC_IRDT_ENTRY(idx));
523 *dp1 = iosapic_read(isp->addr, IOSAPIC_IRDT_ENTRY_HI(idx));
524 }
525
526
iosapic_wr_irt_entry(struct vector_info * vi,u32 dp0,u32 dp1)527 static void iosapic_wr_irt_entry(struct vector_info *vi, u32 dp0, u32 dp1)
528 {
529 struct iosapic_info *isp = vi->iosapic;
530
531 DBG_IRT("iosapic_wr_irt_entry(): irq %d hpa %lx 0x%x 0x%x\n",
532 vi->irqline, isp->isi_hpa, dp0, dp1);
533
534 iosapic_write(isp->addr, IOSAPIC_IRDT_ENTRY(vi->irqline), dp0);
535
536 /* Read the window register to flush the writes down to HW */
537 dp0 = readl(isp->addr+IOSAPIC_REG_WINDOW);
538
539 iosapic_write(isp->addr, IOSAPIC_IRDT_ENTRY_HI(vi->irqline), dp1);
540
541 /* Read the window register to flush the writes down to HW */
542 dp1 = readl(isp->addr+IOSAPIC_REG_WINDOW);
543 }
544
545 /*
546 ** set_irt prepares the data (dp0, dp1) according to the vector_info
547 ** and target cpu (id_eid). dp0/dp1 are then used to program I/O SAPIC
548 ** IRdT for the given "vector" (aka IRQ line).
549 */
550 static void
iosapic_set_irt_data(struct vector_info * vi,u32 * dp0,u32 * dp1)551 iosapic_set_irt_data( struct vector_info *vi, u32 *dp0, u32 *dp1)
552 {
553 u32 mode = 0;
554 struct irt_entry *p = vi->irte;
555
556 if ((p->polarity_trigger & IRT_PO_MASK) == IRT_ACTIVE_LO)
557 mode |= IOSAPIC_IRDT_PO_LOW;
558
559 if (((p->polarity_trigger >> IRT_EL_SHIFT) & IRT_EL_MASK) == IRT_LEVEL_TRIG)
560 mode |= IOSAPIC_IRDT_LEVEL_TRIG;
561
562 /*
563 ** IA64 REVISIT
564 ** PA doesn't support EXTINT or LPRIO bits.
565 */
566
567 *dp0 = mode | (u32) vi->txn_data;
568
569 /*
570 ** Extracting id_eid isn't a real clean way of getting it.
571 ** But the encoding is the same for both PA and IA64 platforms.
572 */
573 if (is_pdc_pat()) {
574 /*
575 ** PAT PDC just hands it to us "right".
576 ** txn_addr comes from cpu_data[x].txn_addr.
577 */
578 *dp1 = (u32) (vi->txn_addr);
579 } else {
580 /*
581 ** eg if base_addr == 0xfffa0000),
582 ** we want to get 0xa0ff0000.
583 **
584 ** eid 0x0ff00000 -> 0x00ff0000
585 ** id 0x000ff000 -> 0xff000000
586 */
587 *dp1 = (((u32)vi->txn_addr & 0x0ff00000) >> 4) |
588 (((u32)vi->txn_addr & 0x000ff000) << 12);
589 }
590 DBG_IRT("iosapic_set_irt_data(): 0x%x 0x%x\n", *dp0, *dp1);
591 }
592
593
iosapic_mask_irq(struct irq_data * d)594 static void iosapic_mask_irq(struct irq_data *d)
595 {
596 unsigned long flags;
597 struct vector_info *vi = irq_data_get_irq_chip_data(d);
598 u32 d0, d1;
599
600 spin_lock_irqsave(&iosapic_lock, flags);
601 iosapic_rd_irt_entry(vi, &d0, &d1);
602 d0 |= IOSAPIC_IRDT_ENABLE;
603 iosapic_wr_irt_entry(vi, d0, d1);
604 spin_unlock_irqrestore(&iosapic_lock, flags);
605 }
606
iosapic_unmask_irq(struct irq_data * d)607 static void iosapic_unmask_irq(struct irq_data *d)
608 {
609 struct vector_info *vi = irq_data_get_irq_chip_data(d);
610 u32 d0, d1;
611
612 /* data is initialized by fixup_irq */
613 WARN_ON(vi->txn_irq == 0);
614
615 iosapic_set_irt_data(vi, &d0, &d1);
616 iosapic_wr_irt_entry(vi, d0, d1);
617
618 #ifdef DEBUG_IOSAPIC_IRT
619 {
620 u32 *t = (u32 *) ((ulong) vi->eoi_addr & ~0xffUL);
621 printk("iosapic_enable_irq(): regs %p", vi->eoi_addr);
622 for ( ; t < vi->eoi_addr; t++)
623 printk(" %x", readl(t));
624 printk("\n");
625 }
626
627 printk("iosapic_enable_irq(): sel ");
628 {
629 struct iosapic_info *isp = vi->iosapic;
630
631 for (d0=0x10; d0<0x1e; d0++) {
632 d1 = iosapic_read(isp->addr, d0);
633 printk(" %x", d1);
634 }
635 }
636 printk("\n");
637 #endif
638
639 /*
640 * Issuing I/O SAPIC an EOI causes an interrupt IFF IRQ line is
641 * asserted. IRQ generally should not be asserted when a driver
642 * enables their IRQ. It can lead to "interesting" race conditions
643 * in the driver initialization sequence.
644 */
645 DBG(KERN_DEBUG "enable_irq(%d): eoi(%p, 0x%x)\n", d->irq,
646 vi->eoi_addr, vi->eoi_data);
647 iosapic_eoi(vi->eoi_addr, vi->eoi_data);
648 }
649
iosapic_eoi_irq(struct irq_data * d)650 static void iosapic_eoi_irq(struct irq_data *d)
651 {
652 struct vector_info *vi = irq_data_get_irq_chip_data(d);
653
654 iosapic_eoi(vi->eoi_addr, vi->eoi_data);
655 cpu_eoi_irq(d);
656 }
657
658 #ifdef CONFIG_SMP
iosapic_set_affinity_irq(struct irq_data * d,const struct cpumask * dest,bool force)659 static int iosapic_set_affinity_irq(struct irq_data *d,
660 const struct cpumask *dest, bool force)
661 {
662 struct vector_info *vi = irq_data_get_irq_chip_data(d);
663 u32 d0, d1, dummy_d0;
664 unsigned long flags;
665 int dest_cpu;
666
667 dest_cpu = cpu_check_affinity(d, dest);
668 if (dest_cpu < 0)
669 return -1;
670
671 irq_data_update_affinity(d, cpumask_of(dest_cpu));
672 vi->txn_addr = txn_affinity_addr(d->irq, dest_cpu);
673
674 spin_lock_irqsave(&iosapic_lock, flags);
675 /* d1 contains the destination CPU, so only want to set that
676 * entry */
677 iosapic_rd_irt_entry(vi, &d0, &d1);
678 iosapic_set_irt_data(vi, &dummy_d0, &d1);
679 iosapic_wr_irt_entry(vi, d0, d1);
680 spin_unlock_irqrestore(&iosapic_lock, flags);
681
682 return 0;
683 }
684 #endif
685
686 static struct irq_chip iosapic_interrupt_type = {
687 .name = "IO-SAPIC-level",
688 .irq_unmask = iosapic_unmask_irq,
689 .irq_mask = iosapic_mask_irq,
690 .irq_ack = cpu_ack_irq,
691 .irq_eoi = iosapic_eoi_irq,
692 #ifdef CONFIG_SMP
693 .irq_set_affinity = iosapic_set_affinity_irq,
694 #endif
695 };
696
iosapic_fixup_irq(void * isi_obj,struct pci_dev * pcidev)697 int iosapic_fixup_irq(void *isi_obj, struct pci_dev *pcidev)
698 {
699 struct iosapic_info *isi = isi_obj;
700 struct irt_entry *irte = NULL; /* only used if PAT PDC */
701 struct vector_info *vi;
702 int isi_line; /* line used by device */
703
704 if (!isi) {
705 printk(KERN_WARNING MODULE_NAME ": hpa not registered for %s\n",
706 pci_name(pcidev));
707 return -1;
708 }
709
710 #ifdef CONFIG_SUPERIO
711 /*
712 * HACK ALERT! (non-compliant PCI device support)
713 *
714 * All SuckyIO interrupts are routed through the PIC's on function 1.
715 * But SuckyIO OHCI USB controller gets an IRT entry anyway because
716 * it advertises INT D for INT_PIN. Use that IRT entry to get the
717 * SuckyIO interrupt routing for PICs on function 1 (*BLEECCHH*).
718 */
719 if (is_superio_device(pcidev)) {
720 /* We must call superio_fixup_irq() to register the pdev */
721 pcidev->irq = superio_fixup_irq(pcidev);
722
723 /* Don't return if need to program the IOSAPIC's IRT... */
724 if (PCI_FUNC(pcidev->devfn) != SUPERIO_USB_FN)
725 return pcidev->irq;
726 }
727 #endif /* CONFIG_SUPERIO */
728
729 /* lookup IRT entry for isi/slot/pin set */
730 irte = iosapic_xlate_pin(isi, pcidev);
731 if (!irte) {
732 printk("iosapic: no IRTE for %s (IRQ not connected?)\n",
733 pci_name(pcidev));
734 return -1;
735 }
736 DBG_IRT("iosapic_fixup_irq(): irte %p %x %x %x %x %x %x %x %x\n",
737 irte,
738 irte->entry_type,
739 irte->entry_length,
740 irte->polarity_trigger,
741 irte->src_bus_irq_devno,
742 irte->src_bus_id,
743 irte->src_seg_id,
744 irte->dest_iosapic_intin,
745 (u32) irte->dest_iosapic_addr);
746 isi_line = irte->dest_iosapic_intin;
747
748 /* get vector info for this input line */
749 vi = isi->isi_vector + isi_line;
750 DBG_IRT("iosapic_fixup_irq: line %d vi 0x%p\n", isi_line, vi);
751
752 /* If this IRQ line has already been setup, skip it */
753 if (vi->irte)
754 goto out;
755
756 vi->irte = irte;
757
758 /*
759 * Allocate processor IRQ
760 *
761 * XXX/FIXME The txn_alloc_irq() code and related code should be
762 * moved to enable_irq(). That way we only allocate processor IRQ
763 * bits for devices that actually have drivers claiming them.
764 * Right now we assign an IRQ to every PCI device present,
765 * regardless of whether it's used or not.
766 */
767 vi->txn_irq = txn_alloc_irq(8);
768
769 if (vi->txn_irq < 0)
770 panic("I/O sapic: couldn't get TXN IRQ\n");
771
772 /* enable_irq() will use txn_* to program IRdT */
773 vi->txn_addr = txn_alloc_addr(vi->txn_irq);
774 vi->txn_data = txn_alloc_data(vi->txn_irq);
775
776 vi->eoi_addr = isi->addr + IOSAPIC_REG_EOI;
777 vi->eoi_data = cpu_to_le32(vi->txn_data);
778
779 cpu_claim_irq(vi->txn_irq, &iosapic_interrupt_type, vi);
780
781 out:
782 pcidev->irq = vi->txn_irq;
783
784 DBG_IRT("iosapic_fixup_irq() %d:%d %x %x line %d irq %d\n",
785 PCI_SLOT(pcidev->devfn), PCI_FUNC(pcidev->devfn),
786 pcidev->vendor, pcidev->device, isi_line, pcidev->irq);
787
788 return pcidev->irq;
789 }
790
791 static struct iosapic_info *iosapic_list;
792
793 #ifdef CONFIG_64BIT
iosapic_serial_irq(struct parisc_device * dev)794 int iosapic_serial_irq(struct parisc_device *dev)
795 {
796 struct iosapic_info *isi;
797 struct irt_entry *irte;
798 struct vector_info *vi;
799 int cnt;
800 int intin;
801
802 intin = (dev->mod_info >> 24) & 15;
803
804 /* lookup IRT entry for isi/slot/pin set */
805 for (cnt = 0; cnt < irt_num_entry; cnt++) {
806 irte = &irt_cell[cnt];
807 if (COMPARE_IRTE_ADDR(irte, dev->mod0) &&
808 irte->dest_iosapic_intin == intin)
809 break;
810 }
811 if (cnt >= irt_num_entry)
812 return 0; /* no irq found, force polling */
813
814 DBG_IRT("iosapic_serial_irq(): irte %p %x %x %x %x %x %x %x %x\n",
815 irte,
816 irte->entry_type,
817 irte->entry_length,
818 irte->polarity_trigger,
819 irte->src_bus_irq_devno,
820 irte->src_bus_id,
821 irte->src_seg_id,
822 irte->dest_iosapic_intin,
823 (u32) irte->dest_iosapic_addr);
824
825 /* search for iosapic */
826 for (isi = iosapic_list; isi; isi = isi->isi_next)
827 if (isi->isi_hpa == dev->mod0)
828 break;
829 if (!isi)
830 return 0; /* no iosapic found, force polling */
831
832 /* get vector info for this input line */
833 vi = isi->isi_vector + intin;
834 DBG_IRT("iosapic_serial_irq: line %d vi 0x%p\n", iosapic_intin, vi);
835
836 /* If this IRQ line has already been setup, skip it */
837 if (vi->irte)
838 goto out;
839
840 vi->irte = irte;
841
842 /*
843 * Allocate processor IRQ
844 *
845 * XXX/FIXME The txn_alloc_irq() code and related code should be
846 * moved to enable_irq(). That way we only allocate processor IRQ
847 * bits for devices that actually have drivers claiming them.
848 * Right now we assign an IRQ to every PCI device present,
849 * regardless of whether it's used or not.
850 */
851 vi->txn_irq = txn_alloc_irq(8);
852
853 if (vi->txn_irq < 0)
854 panic("I/O sapic: couldn't get TXN IRQ\n");
855
856 /* enable_irq() will use txn_* to program IRdT */
857 vi->txn_addr = txn_alloc_addr(vi->txn_irq);
858 vi->txn_data = txn_alloc_data(vi->txn_irq);
859
860 vi->eoi_addr = isi->addr + IOSAPIC_REG_EOI;
861 vi->eoi_data = cpu_to_le32(vi->txn_data);
862
863 cpu_claim_irq(vi->txn_irq, &iosapic_interrupt_type, vi);
864
865 out:
866
867 return vi->txn_irq;
868 }
869 EXPORT_SYMBOL(iosapic_serial_irq);
870 #endif
871
872
873 /*
874 ** squirrel away the I/O Sapic Version
875 */
876 static unsigned int
iosapic_rd_version(struct iosapic_info * isi)877 iosapic_rd_version(struct iosapic_info *isi)
878 {
879 return iosapic_read(isi->addr, IOSAPIC_REG_VERSION);
880 }
881
882
883 /*
884 ** iosapic_register() is called by "drivers" with an integrated I/O SAPIC.
885 ** Caller must be certain they have an I/O SAPIC and know its MMIO address.
886 **
887 ** o allocate iosapic_info and add it to the list
888 ** o read iosapic version and squirrel that away
889 ** o read size of IRdT.
890 ** o allocate and initialize isi_vector[]
891 ** o allocate irq region
892 */
iosapic_register(unsigned long hpa)893 void *iosapic_register(unsigned long hpa)
894 {
895 struct iosapic_info *isi = NULL;
896 struct irt_entry *irte = irt_cell;
897 struct vector_info *vip;
898 int cnt; /* track how many entries we've looked at */
899
900 /*
901 * Astro based platforms can only support PCI OLARD if they implement
902 * PAT PDC. Legacy PDC omits LBAs with no PCI devices from the IRT.
903 * Search the IRT and ignore iosapic's which aren't in the IRT.
904 */
905 for (cnt=0; cnt < irt_num_entry; cnt++, irte++) {
906 WARN_ON(IRT_IOSAPIC_TYPE != irte->entry_type);
907 if (COMPARE_IRTE_ADDR(irte, hpa))
908 break;
909 }
910
911 if (cnt >= irt_num_entry) {
912 DBG("iosapic_register() ignoring 0x%lx (NOT FOUND)\n", hpa);
913 return NULL;
914 }
915
916 isi = kzalloc(sizeof(struct iosapic_info), GFP_KERNEL);
917 if (!isi) {
918 BUG();
919 return NULL;
920 }
921
922 isi->addr = ioremap(hpa, 4096);
923 isi->isi_hpa = hpa;
924 isi->isi_version = iosapic_rd_version(isi);
925 isi->isi_num_vectors = IOSAPIC_IRDT_MAX_ENTRY(isi->isi_version) + 1;
926
927 vip = isi->isi_vector = kcalloc(isi->isi_num_vectors,
928 sizeof(struct vector_info), GFP_KERNEL);
929 if (vip == NULL) {
930 kfree(isi);
931 return NULL;
932 }
933
934 for (cnt=0; cnt < isi->isi_num_vectors; cnt++, vip++) {
935 vip->irqline = (unsigned char) cnt;
936 vip->iosapic = isi;
937 }
938 isi->isi_next = iosapic_list;
939 iosapic_list = isi;
940 return isi;
941 }
942
943
944 #ifdef DEBUG_IOSAPIC
945
946 static void
iosapic_prt_irt(void * irt,long num_entry)947 iosapic_prt_irt(void *irt, long num_entry)
948 {
949 unsigned int i, *irp = (unsigned int *) irt;
950
951
952 printk(KERN_DEBUG MODULE_NAME ": Interrupt Routing Table (%lx entries)\n", num_entry);
953
954 for (i=0; i<num_entry; i++, irp += 4) {
955 printk(KERN_DEBUG "%p : %2d %.8x %.8x %.8x %.8x\n",
956 irp, i, irp[0], irp[1], irp[2], irp[3]);
957 }
958 }
959
960
961 static void
iosapic_prt_vi(struct vector_info * vi)962 iosapic_prt_vi(struct vector_info *vi)
963 {
964 printk(KERN_DEBUG MODULE_NAME ": vector_info[%d] is at %p\n", vi->irqline, vi);
965 printk(KERN_DEBUG "\t\tstatus: %.4x\n", vi->status);
966 printk(KERN_DEBUG "\t\ttxn_irq: %d\n", vi->txn_irq);
967 printk(KERN_DEBUG "\t\ttxn_addr: %lx\n", vi->txn_addr);
968 printk(KERN_DEBUG "\t\ttxn_data: %lx\n", vi->txn_data);
969 printk(KERN_DEBUG "\t\teoi_addr: %p\n", vi->eoi_addr);
970 printk(KERN_DEBUG "\t\teoi_data: %x\n", vi->eoi_data);
971 }
972
973
974 static void
iosapic_prt_isi(struct iosapic_info * isi)975 iosapic_prt_isi(struct iosapic_info *isi)
976 {
977 printk(KERN_DEBUG MODULE_NAME ": io_sapic_info at %p\n", isi);
978 printk(KERN_DEBUG "\t\tisi_hpa: %lx\n", isi->isi_hpa);
979 printk(KERN_DEBUG "\t\tisi_status: %x\n", isi->isi_status);
980 printk(KERN_DEBUG "\t\tisi_version: %x\n", isi->isi_version);
981 printk(KERN_DEBUG "\t\tisi_vector: %p\n", isi->isi_vector);
982 }
983 #endif /* DEBUG_IOSAPIC */
984