1 /* psycho_common.c: Code common to PSYCHO and derivative PCI controllers.
2 *
3 * Copyright (C) 2008 David S. Miller <davem@davemloft.net>
4 */
5 #include <linux/kernel.h>
6 #include <linux/interrupt.h>
7
8 #include <asm/upa.h>
9
10 #include "pci_impl.h"
11 #include "iommu_common.h"
12 #include "psycho_common.h"
13
14 #define PSYCHO_STRBUF_CTRL_DENAB 0x0000000000000002ULL
15 #define PSYCHO_STCERR_WRITE 0x0000000000000002ULL
16 #define PSYCHO_STCERR_READ 0x0000000000000001ULL
17 #define PSYCHO_STCTAG_PPN 0x0fffffff00000000ULL
18 #define PSYCHO_STCTAG_VPN 0x00000000ffffe000ULL
19 #define PSYCHO_STCTAG_VALID 0x0000000000000002ULL
20 #define PSYCHO_STCTAG_WRITE 0x0000000000000001ULL
21 #define PSYCHO_STCLINE_LINDX 0x0000000001e00000ULL
22 #define PSYCHO_STCLINE_SPTR 0x00000000001f8000ULL
23 #define PSYCHO_STCLINE_LADDR 0x0000000000007f00ULL
24 #define PSYCHO_STCLINE_EPTR 0x00000000000000fcULL
25 #define PSYCHO_STCLINE_VALID 0x0000000000000002ULL
26 #define PSYCHO_STCLINE_FOFN 0x0000000000000001ULL
27
28 static DEFINE_SPINLOCK(stc_buf_lock);
29 static unsigned long stc_error_buf[128];
30 static unsigned long stc_tag_buf[16];
31 static unsigned long stc_line_buf[16];
32
psycho_check_stc_error(struct pci_pbm_info * pbm)33 static void psycho_check_stc_error(struct pci_pbm_info *pbm)
34 {
35 unsigned long err_base, tag_base, line_base;
36 struct strbuf *strbuf = &pbm->stc;
37 u64 control;
38 int i;
39
40 if (!strbuf->strbuf_control)
41 return;
42
43 err_base = strbuf->strbuf_err_stat;
44 tag_base = strbuf->strbuf_tag_diag;
45 line_base = strbuf->strbuf_line_diag;
46
47 spin_lock(&stc_buf_lock);
48
49 /* This is __REALLY__ dangerous. When we put the streaming
50 * buffer into diagnostic mode to probe it's tags and error
51 * status, we _must_ clear all of the line tag valid bits
52 * before re-enabling the streaming buffer. If any dirty data
53 * lives in the STC when we do this, we will end up
54 * invalidating it before it has a chance to reach main
55 * memory.
56 */
57 control = upa_readq(strbuf->strbuf_control);
58 upa_writeq(control | PSYCHO_STRBUF_CTRL_DENAB, strbuf->strbuf_control);
59 for (i = 0; i < 128; i++) {
60 u64 val;
61
62 val = upa_readq(err_base + (i * 8UL));
63 upa_writeq(0UL, err_base + (i * 8UL));
64 stc_error_buf[i] = val;
65 }
66 for (i = 0; i < 16; i++) {
67 stc_tag_buf[i] = upa_readq(tag_base + (i * 8UL));
68 stc_line_buf[i] = upa_readq(line_base + (i * 8UL));
69 upa_writeq(0UL, tag_base + (i * 8UL));
70 upa_writeq(0UL, line_base + (i * 8UL));
71 }
72
73 /* OK, state is logged, exit diagnostic mode. */
74 upa_writeq(control, strbuf->strbuf_control);
75
76 for (i = 0; i < 16; i++) {
77 int j, saw_error, first, last;
78
79 saw_error = 0;
80 first = i * 8;
81 last = first + 8;
82 for (j = first; j < last; j++) {
83 u64 errval = stc_error_buf[j];
84 if (errval != 0) {
85 saw_error++;
86 printk(KERN_ERR "%s: STC_ERR(%d)[wr(%d)"
87 "rd(%d)]\n",
88 pbm->name,
89 j,
90 (errval & PSYCHO_STCERR_WRITE) ? 1 : 0,
91 (errval & PSYCHO_STCERR_READ) ? 1 : 0);
92 }
93 }
94 if (saw_error != 0) {
95 u64 tagval = stc_tag_buf[i];
96 u64 lineval = stc_line_buf[i];
97 printk(KERN_ERR "%s: STC_TAG(%d)[PA(%016llx)VA(%08llx)"
98 "V(%d)W(%d)]\n",
99 pbm->name,
100 i,
101 ((tagval & PSYCHO_STCTAG_PPN) >> 19UL),
102 (tagval & PSYCHO_STCTAG_VPN),
103 ((tagval & PSYCHO_STCTAG_VALID) ? 1 : 0),
104 ((tagval & PSYCHO_STCTAG_WRITE) ? 1 : 0));
105 printk(KERN_ERR "%s: STC_LINE(%d)[LIDX(%llx)SP(%llx)"
106 "LADDR(%llx)EP(%llx)V(%d)FOFN(%d)]\n",
107 pbm->name,
108 i,
109 ((lineval & PSYCHO_STCLINE_LINDX) >> 21UL),
110 ((lineval & PSYCHO_STCLINE_SPTR) >> 15UL),
111 ((lineval & PSYCHO_STCLINE_LADDR) >> 8UL),
112 ((lineval & PSYCHO_STCLINE_EPTR) >> 2UL),
113 ((lineval & PSYCHO_STCLINE_VALID) ? 1 : 0),
114 ((lineval & PSYCHO_STCLINE_FOFN) ? 1 : 0));
115 }
116 }
117
118 spin_unlock(&stc_buf_lock);
119 }
120
121 #define PSYCHO_IOMMU_TAG 0xa580UL
122 #define PSYCHO_IOMMU_DATA 0xa600UL
123
psycho_record_iommu_tags_and_data(struct pci_pbm_info * pbm,u64 * tag,u64 * data)124 static void psycho_record_iommu_tags_and_data(struct pci_pbm_info *pbm,
125 u64 *tag, u64 *data)
126 {
127 int i;
128
129 for (i = 0; i < 16; i++) {
130 unsigned long base = pbm->controller_regs;
131 unsigned long off = i * 8UL;
132
133 tag[i] = upa_readq(base + PSYCHO_IOMMU_TAG+off);
134 data[i] = upa_readq(base + PSYCHO_IOMMU_DATA+off);
135
136 /* Now clear out the entry. */
137 upa_writeq(0, base + PSYCHO_IOMMU_TAG + off);
138 upa_writeq(0, base + PSYCHO_IOMMU_DATA + off);
139 }
140 }
141
142 #define PSYCHO_IOMMU_TAG_ERRSTS (0x3UL << 23UL)
143 #define PSYCHO_IOMMU_TAG_ERR (0x1UL << 22UL)
144 #define PSYCHO_IOMMU_TAG_WRITE (0x1UL << 21UL)
145 #define PSYCHO_IOMMU_TAG_STREAM (0x1UL << 20UL)
146 #define PSYCHO_IOMMU_TAG_SIZE (0x1UL << 19UL)
147 #define PSYCHO_IOMMU_TAG_VPAGE 0x7ffffULL
148 #define PSYCHO_IOMMU_DATA_VALID (1UL << 30UL)
149 #define PSYCHO_IOMMU_DATA_CACHE (1UL << 28UL)
150 #define PSYCHO_IOMMU_DATA_PPAGE 0xfffffffULL
151
psycho_dump_iommu_tags_and_data(struct pci_pbm_info * pbm,u64 * tag,u64 * data)152 static void psycho_dump_iommu_tags_and_data(struct pci_pbm_info *pbm,
153 u64 *tag, u64 *data)
154 {
155 int i;
156
157 for (i = 0; i < 16; i++) {
158 u64 tag_val, data_val;
159 const char *type_str;
160 tag_val = tag[i];
161 if (!(tag_val & PSYCHO_IOMMU_TAG_ERR))
162 continue;
163
164 data_val = data[i];
165 switch((tag_val & PSYCHO_IOMMU_TAG_ERRSTS) >> 23UL) {
166 case 0:
167 type_str = "Protection Error";
168 break;
169 case 1:
170 type_str = "Invalid Error";
171 break;
172 case 2:
173 type_str = "TimeOut Error";
174 break;
175 case 3:
176 default:
177 type_str = "ECC Error";
178 break;
179 }
180
181 printk(KERN_ERR "%s: IOMMU TAG(%d)[error(%s) wr(%d) "
182 "str(%d) sz(%dK) vpg(%08llx)]\n",
183 pbm->name, i, type_str,
184 ((tag_val & PSYCHO_IOMMU_TAG_WRITE) ? 1 : 0),
185 ((tag_val & PSYCHO_IOMMU_TAG_STREAM) ? 1 : 0),
186 ((tag_val & PSYCHO_IOMMU_TAG_SIZE) ? 64 : 8),
187 (tag_val & PSYCHO_IOMMU_TAG_VPAGE) << IOMMU_PAGE_SHIFT);
188 printk(KERN_ERR "%s: IOMMU DATA(%d)[valid(%d) cache(%d) "
189 "ppg(%016llx)]\n",
190 pbm->name, i,
191 ((data_val & PSYCHO_IOMMU_DATA_VALID) ? 1 : 0),
192 ((data_val & PSYCHO_IOMMU_DATA_CACHE) ? 1 : 0),
193 (data_val & PSYCHO_IOMMU_DATA_PPAGE) << IOMMU_PAGE_SHIFT);
194 }
195 }
196
197 #define PSYCHO_IOMMU_CTRL_XLTESTAT 0x0000000006000000UL
198 #define PSYCHO_IOMMU_CTRL_XLTEERR 0x0000000001000000UL
199
psycho_check_iommu_error(struct pci_pbm_info * pbm,unsigned long afsr,unsigned long afar,enum psycho_error_type type)200 void psycho_check_iommu_error(struct pci_pbm_info *pbm,
201 unsigned long afsr,
202 unsigned long afar,
203 enum psycho_error_type type)
204 {
205 u64 control, iommu_tag[16], iommu_data[16];
206 struct iommu *iommu = pbm->iommu;
207 unsigned long flags;
208
209 spin_lock_irqsave(&iommu->lock, flags);
210 control = upa_readq(iommu->iommu_control);
211 if (control & PSYCHO_IOMMU_CTRL_XLTEERR) {
212 const char *type_str;
213
214 control &= ~PSYCHO_IOMMU_CTRL_XLTEERR;
215 upa_writeq(control, iommu->iommu_control);
216
217 switch ((control & PSYCHO_IOMMU_CTRL_XLTESTAT) >> 25UL) {
218 case 0:
219 type_str = "Protection Error";
220 break;
221 case 1:
222 type_str = "Invalid Error";
223 break;
224 case 2:
225 type_str = "TimeOut Error";
226 break;
227 case 3:
228 default:
229 type_str = "ECC Error";
230 break;
231 };
232 printk(KERN_ERR "%s: IOMMU Error, type[%s]\n",
233 pbm->name, type_str);
234
235 /* It is very possible for another DVMA to occur while
236 * we do this probe, and corrupt the system further.
237 * But we are so screwed at this point that we are
238 * likely to crash hard anyways, so get as much
239 * diagnostic information to the console as we can.
240 */
241 psycho_record_iommu_tags_and_data(pbm, iommu_tag, iommu_data);
242 psycho_dump_iommu_tags_and_data(pbm, iommu_tag, iommu_data);
243 }
244 psycho_check_stc_error(pbm);
245 spin_unlock_irqrestore(&iommu->lock, flags);
246 }
247
248 #define PSYCHO_PCICTRL_SBH_ERR 0x0000000800000000UL
249 #define PSYCHO_PCICTRL_SERR 0x0000000400000000UL
250
psycho_pcierr_intr_other(struct pci_pbm_info * pbm)251 static irqreturn_t psycho_pcierr_intr_other(struct pci_pbm_info *pbm)
252 {
253 irqreturn_t ret = IRQ_NONE;
254 u64 csr, csr_error_bits;
255 u16 stat, *addr;
256
257 csr = upa_readq(pbm->pci_csr);
258 csr_error_bits = csr & (PSYCHO_PCICTRL_SBH_ERR | PSYCHO_PCICTRL_SERR);
259 if (csr_error_bits) {
260 /* Clear the errors. */
261 upa_writeq(csr, pbm->pci_csr);
262
263 /* Log 'em. */
264 if (csr_error_bits & PSYCHO_PCICTRL_SBH_ERR)
265 printk(KERN_ERR "%s: PCI streaming byte hole "
266 "error asserted.\n", pbm->name);
267 if (csr_error_bits & PSYCHO_PCICTRL_SERR)
268 printk(KERN_ERR "%s: PCI SERR signal asserted.\n",
269 pbm->name);
270 ret = IRQ_HANDLED;
271 }
272 addr = psycho_pci_config_mkaddr(pbm, pbm->pci_first_busno,
273 0, PCI_STATUS);
274 pci_config_read16(addr, &stat);
275 if (stat & (PCI_STATUS_PARITY |
276 PCI_STATUS_SIG_TARGET_ABORT |
277 PCI_STATUS_REC_TARGET_ABORT |
278 PCI_STATUS_REC_MASTER_ABORT |
279 PCI_STATUS_SIG_SYSTEM_ERROR)) {
280 printk(KERN_ERR "%s: PCI bus error, PCI_STATUS[%04x]\n",
281 pbm->name, stat);
282 pci_config_write16(addr, 0xffff);
283 ret = IRQ_HANDLED;
284 }
285 return ret;
286 }
287
288 #define PSYCHO_PCIAFSR_PMA 0x8000000000000000ULL
289 #define PSYCHO_PCIAFSR_PTA 0x4000000000000000ULL
290 #define PSYCHO_PCIAFSR_PRTRY 0x2000000000000000ULL
291 #define PSYCHO_PCIAFSR_PPERR 0x1000000000000000ULL
292 #define PSYCHO_PCIAFSR_SMA 0x0800000000000000ULL
293 #define PSYCHO_PCIAFSR_STA 0x0400000000000000ULL
294 #define PSYCHO_PCIAFSR_SRTRY 0x0200000000000000ULL
295 #define PSYCHO_PCIAFSR_SPERR 0x0100000000000000ULL
296 #define PSYCHO_PCIAFSR_RESV1 0x00ff000000000000ULL
297 #define PSYCHO_PCIAFSR_BMSK 0x0000ffff00000000ULL
298 #define PSYCHO_PCIAFSR_BLK 0x0000000080000000ULL
299 #define PSYCHO_PCIAFSR_RESV2 0x0000000040000000ULL
300 #define PSYCHO_PCIAFSR_MID 0x000000003e000000ULL
301 #define PSYCHO_PCIAFSR_RESV3 0x0000000001ffffffULL
302
psycho_pcierr_intr(int irq,void * dev_id)303 irqreturn_t psycho_pcierr_intr(int irq, void *dev_id)
304 {
305 struct pci_pbm_info *pbm = dev_id;
306 u64 afsr, afar, error_bits;
307 int reported;
308
309 afsr = upa_readq(pbm->pci_afsr);
310 afar = upa_readq(pbm->pci_afar);
311 error_bits = afsr &
312 (PSYCHO_PCIAFSR_PMA | PSYCHO_PCIAFSR_PTA |
313 PSYCHO_PCIAFSR_PRTRY | PSYCHO_PCIAFSR_PPERR |
314 PSYCHO_PCIAFSR_SMA | PSYCHO_PCIAFSR_STA |
315 PSYCHO_PCIAFSR_SRTRY | PSYCHO_PCIAFSR_SPERR);
316 if (!error_bits)
317 return psycho_pcierr_intr_other(pbm);
318 upa_writeq(error_bits, pbm->pci_afsr);
319 printk(KERN_ERR "%s: PCI Error, primary error type[%s]\n",
320 pbm->name,
321 (((error_bits & PSYCHO_PCIAFSR_PMA) ?
322 "Master Abort" :
323 ((error_bits & PSYCHO_PCIAFSR_PTA) ?
324 "Target Abort" :
325 ((error_bits & PSYCHO_PCIAFSR_PRTRY) ?
326 "Excessive Retries" :
327 ((error_bits & PSYCHO_PCIAFSR_PPERR) ?
328 "Parity Error" : "???"))))));
329 printk(KERN_ERR "%s: bytemask[%04llx] UPA_MID[%02llx] was_block(%d)\n",
330 pbm->name,
331 (afsr & PSYCHO_PCIAFSR_BMSK) >> 32UL,
332 (afsr & PSYCHO_PCIAFSR_MID) >> 25UL,
333 (afsr & PSYCHO_PCIAFSR_BLK) ? 1 : 0);
334 printk(KERN_ERR "%s: PCI AFAR [%016llx]\n", pbm->name, afar);
335 printk(KERN_ERR "%s: PCI Secondary errors [", pbm->name);
336 reported = 0;
337 if (afsr & PSYCHO_PCIAFSR_SMA) {
338 reported++;
339 printk("(Master Abort)");
340 }
341 if (afsr & PSYCHO_PCIAFSR_STA) {
342 reported++;
343 printk("(Target Abort)");
344 }
345 if (afsr & PSYCHO_PCIAFSR_SRTRY) {
346 reported++;
347 printk("(Excessive Retries)");
348 }
349 if (afsr & PSYCHO_PCIAFSR_SPERR) {
350 reported++;
351 printk("(Parity Error)");
352 }
353 if (!reported)
354 printk("(none)");
355 printk("]\n");
356
357 if (error_bits & (PSYCHO_PCIAFSR_PTA | PSYCHO_PCIAFSR_STA)) {
358 psycho_check_iommu_error(pbm, afsr, afar, PCI_ERR);
359 pci_scan_for_target_abort(pbm, pbm->pci_bus);
360 }
361 if (error_bits & (PSYCHO_PCIAFSR_PMA | PSYCHO_PCIAFSR_SMA))
362 pci_scan_for_master_abort(pbm, pbm->pci_bus);
363
364 if (error_bits & (PSYCHO_PCIAFSR_PPERR | PSYCHO_PCIAFSR_SPERR))
365 pci_scan_for_parity_error(pbm, pbm->pci_bus);
366
367 return IRQ_HANDLED;
368 }
369
psycho_iommu_flush(struct pci_pbm_info * pbm)370 static void psycho_iommu_flush(struct pci_pbm_info *pbm)
371 {
372 int i;
373
374 for (i = 0; i < 16; i++) {
375 unsigned long off = i * 8;
376
377 upa_writeq(0, pbm->controller_regs + PSYCHO_IOMMU_TAG + off);
378 upa_writeq(0, pbm->controller_regs + PSYCHO_IOMMU_DATA + off);
379 }
380 }
381
382 #define PSYCHO_IOMMU_CONTROL 0x0200UL
383 #define PSYCHO_IOMMU_CTRL_TSBSZ 0x0000000000070000UL
384 #define PSYCHO_IOMMU_TSBSZ_1K 0x0000000000000000UL
385 #define PSYCHO_IOMMU_TSBSZ_2K 0x0000000000010000UL
386 #define PSYCHO_IOMMU_TSBSZ_4K 0x0000000000020000UL
387 #define PSYCHO_IOMMU_TSBSZ_8K 0x0000000000030000UL
388 #define PSYCHO_IOMMU_TSBSZ_16K 0x0000000000040000UL
389 #define PSYCHO_IOMMU_TSBSZ_32K 0x0000000000050000UL
390 #define PSYCHO_IOMMU_TSBSZ_64K 0x0000000000060000UL
391 #define PSYCHO_IOMMU_TSBSZ_128K 0x0000000000070000UL
392 #define PSYCHO_IOMMU_CTRL_TBWSZ 0x0000000000000004UL
393 #define PSYCHO_IOMMU_CTRL_DENAB 0x0000000000000002UL
394 #define PSYCHO_IOMMU_CTRL_ENAB 0x0000000000000001UL
395 #define PSYCHO_IOMMU_FLUSH 0x0210UL
396 #define PSYCHO_IOMMU_TSBBASE 0x0208UL
397
psycho_iommu_init(struct pci_pbm_info * pbm,int tsbsize,u32 dvma_offset,u32 dma_mask,unsigned long write_complete_offset)398 int psycho_iommu_init(struct pci_pbm_info *pbm, int tsbsize,
399 u32 dvma_offset, u32 dma_mask,
400 unsigned long write_complete_offset)
401 {
402 struct iommu *iommu = pbm->iommu;
403 u64 control;
404 int err;
405
406 iommu->iommu_control = pbm->controller_regs + PSYCHO_IOMMU_CONTROL;
407 iommu->iommu_tsbbase = pbm->controller_regs + PSYCHO_IOMMU_TSBBASE;
408 iommu->iommu_flush = pbm->controller_regs + PSYCHO_IOMMU_FLUSH;
409 iommu->iommu_tags = pbm->controller_regs + PSYCHO_IOMMU_TAG;
410 iommu->write_complete_reg = (pbm->controller_regs +
411 write_complete_offset);
412
413 iommu->iommu_ctxflush = 0;
414
415 control = upa_readq(iommu->iommu_control);
416 control |= PSYCHO_IOMMU_CTRL_DENAB;
417 upa_writeq(control, iommu->iommu_control);
418
419 psycho_iommu_flush(pbm);
420
421 /* Leave diag mode enabled for full-flushing done in pci_iommu.c */
422 err = iommu_table_init(iommu, tsbsize * 1024 * 8,
423 dvma_offset, dma_mask, pbm->numa_node);
424 if (err)
425 return err;
426
427 upa_writeq(__pa(iommu->page_table), iommu->iommu_tsbbase);
428
429 control = upa_readq(iommu->iommu_control);
430 control &= ~(PSYCHO_IOMMU_CTRL_TSBSZ | PSYCHO_IOMMU_CTRL_TBWSZ);
431 control |= PSYCHO_IOMMU_CTRL_ENAB;
432
433 switch (tsbsize) {
434 case 64:
435 control |= PSYCHO_IOMMU_TSBSZ_64K;
436 break;
437 case 128:
438 control |= PSYCHO_IOMMU_TSBSZ_128K;
439 break;
440 default:
441 return -EINVAL;
442 }
443
444 upa_writeq(control, iommu->iommu_control);
445
446 return 0;
447
448 }
449
psycho_pbm_init_common(struct pci_pbm_info * pbm,struct of_device * op,const char * chip_name,int chip_type)450 void psycho_pbm_init_common(struct pci_pbm_info *pbm, struct of_device *op,
451 const char *chip_name, int chip_type)
452 {
453 struct device_node *dp = op->node;
454
455 pbm->name = dp->full_name;
456 pbm->numa_node = -1;
457 pbm->chip_type = chip_type;
458 pbm->chip_version = of_getintprop_default(dp, "version#", 0);
459 pbm->chip_revision = of_getintprop_default(dp, "module-revision#", 0);
460 pbm->op = op;
461 pbm->pci_ops = &sun4u_pci_ops;
462 pbm->config_space_reg_bits = 8;
463 pbm->index = pci_num_pbms++;
464 pci_get_pbm_props(pbm);
465 pci_determine_mem_io_space(pbm);
466
467 printk(KERN_INFO "%s: %s PCI Bus Module ver[%x:%x]\n",
468 pbm->name, chip_name,
469 pbm->chip_version, pbm->chip_revision);
470 }
471