1 // SPDX-License-Identifier: GPL-2.0
2 /* psycho_common.c: Code common to PSYCHO and derivative PCI controllers.
3 *
4 * Copyright (C) 2008 David S. Miller <davem@davemloft.net>
5 */
6 #include <linux/kernel.h>
7 #include <linux/interrupt.h>
8 #include <linux/numa.h>
9
10 #include <asm/upa.h>
11
12 #include "pci_impl.h"
13 #include "iommu_common.h"
14 #include "psycho_common.h"
15
16 #define PSYCHO_STRBUF_CTRL_DENAB 0x0000000000000002ULL
17 #define PSYCHO_STCERR_WRITE 0x0000000000000002ULL
18 #define PSYCHO_STCERR_READ 0x0000000000000001ULL
19 #define PSYCHO_STCTAG_PPN 0x0fffffff00000000ULL
20 #define PSYCHO_STCTAG_VPN 0x00000000ffffe000ULL
21 #define PSYCHO_STCTAG_VALID 0x0000000000000002ULL
22 #define PSYCHO_STCTAG_WRITE 0x0000000000000001ULL
23 #define PSYCHO_STCLINE_LINDX 0x0000000001e00000ULL
24 #define PSYCHO_STCLINE_SPTR 0x00000000001f8000ULL
25 #define PSYCHO_STCLINE_LADDR 0x0000000000007f00ULL
26 #define PSYCHO_STCLINE_EPTR 0x00000000000000fcULL
27 #define PSYCHO_STCLINE_VALID 0x0000000000000002ULL
28 #define PSYCHO_STCLINE_FOFN 0x0000000000000001ULL
29
30 static DEFINE_SPINLOCK(stc_buf_lock);
31 static unsigned long stc_error_buf[128];
32 static unsigned long stc_tag_buf[16];
33 static unsigned long stc_line_buf[16];
34
psycho_check_stc_error(struct pci_pbm_info * pbm)35 static void psycho_check_stc_error(struct pci_pbm_info *pbm)
36 {
37 unsigned long err_base, tag_base, line_base;
38 struct strbuf *strbuf = &pbm->stc;
39 u64 control;
40 int i;
41
42 if (!strbuf->strbuf_control)
43 return;
44
45 err_base = strbuf->strbuf_err_stat;
46 tag_base = strbuf->strbuf_tag_diag;
47 line_base = strbuf->strbuf_line_diag;
48
49 spin_lock(&stc_buf_lock);
50
51 /* This is __REALLY__ dangerous. When we put the streaming
52 * buffer into diagnostic mode to probe it's tags and error
53 * status, we _must_ clear all of the line tag valid bits
54 * before re-enabling the streaming buffer. If any dirty data
55 * lives in the STC when we do this, we will end up
56 * invalidating it before it has a chance to reach main
57 * memory.
58 */
59 control = upa_readq(strbuf->strbuf_control);
60 upa_writeq(control | PSYCHO_STRBUF_CTRL_DENAB, strbuf->strbuf_control);
61 for (i = 0; i < 128; i++) {
62 u64 val;
63
64 val = upa_readq(err_base + (i * 8UL));
65 upa_writeq(0UL, err_base + (i * 8UL));
66 stc_error_buf[i] = val;
67 }
68 for (i = 0; i < 16; i++) {
69 stc_tag_buf[i] = upa_readq(tag_base + (i * 8UL));
70 stc_line_buf[i] = upa_readq(line_base + (i * 8UL));
71 upa_writeq(0UL, tag_base + (i * 8UL));
72 upa_writeq(0UL, line_base + (i * 8UL));
73 }
74
75 /* OK, state is logged, exit diagnostic mode. */
76 upa_writeq(control, strbuf->strbuf_control);
77
78 for (i = 0; i < 16; i++) {
79 int j, saw_error, first, last;
80
81 saw_error = 0;
82 first = i * 8;
83 last = first + 8;
84 for (j = first; j < last; j++) {
85 u64 errval = stc_error_buf[j];
86 if (errval != 0) {
87 saw_error++;
88 printk(KERN_ERR "%s: STC_ERR(%d)[wr(%d)"
89 "rd(%d)]\n",
90 pbm->name,
91 j,
92 (errval & PSYCHO_STCERR_WRITE) ? 1 : 0,
93 (errval & PSYCHO_STCERR_READ) ? 1 : 0);
94 }
95 }
96 if (saw_error != 0) {
97 u64 tagval = stc_tag_buf[i];
98 u64 lineval = stc_line_buf[i];
99 printk(KERN_ERR "%s: STC_TAG(%d)[PA(%016llx)VA(%08llx)"
100 "V(%d)W(%d)]\n",
101 pbm->name,
102 i,
103 ((tagval & PSYCHO_STCTAG_PPN) >> 19UL),
104 (tagval & PSYCHO_STCTAG_VPN),
105 ((tagval & PSYCHO_STCTAG_VALID) ? 1 : 0),
106 ((tagval & PSYCHO_STCTAG_WRITE) ? 1 : 0));
107 printk(KERN_ERR "%s: STC_LINE(%d)[LIDX(%llx)SP(%llx)"
108 "LADDR(%llx)EP(%llx)V(%d)FOFN(%d)]\n",
109 pbm->name,
110 i,
111 ((lineval & PSYCHO_STCLINE_LINDX) >> 21UL),
112 ((lineval & PSYCHO_STCLINE_SPTR) >> 15UL),
113 ((lineval & PSYCHO_STCLINE_LADDR) >> 8UL),
114 ((lineval & PSYCHO_STCLINE_EPTR) >> 2UL),
115 ((lineval & PSYCHO_STCLINE_VALID) ? 1 : 0),
116 ((lineval & PSYCHO_STCLINE_FOFN) ? 1 : 0));
117 }
118 }
119
120 spin_unlock(&stc_buf_lock);
121 }
122
123 #define PSYCHO_IOMMU_TAG 0xa580UL
124 #define PSYCHO_IOMMU_DATA 0xa600UL
125
psycho_record_iommu_tags_and_data(struct pci_pbm_info * pbm,u64 * tag,u64 * data)126 static void psycho_record_iommu_tags_and_data(struct pci_pbm_info *pbm,
127 u64 *tag, u64 *data)
128 {
129 int i;
130
131 for (i = 0; i < 16; i++) {
132 unsigned long base = pbm->controller_regs;
133 unsigned long off = i * 8UL;
134
135 tag[i] = upa_readq(base + PSYCHO_IOMMU_TAG+off);
136 data[i] = upa_readq(base + PSYCHO_IOMMU_DATA+off);
137
138 /* Now clear out the entry. */
139 upa_writeq(0, base + PSYCHO_IOMMU_TAG + off);
140 upa_writeq(0, base + PSYCHO_IOMMU_DATA + off);
141 }
142 }
143
144 #define PSYCHO_IOMMU_TAG_ERRSTS (0x3UL << 23UL)
145 #define PSYCHO_IOMMU_TAG_ERR (0x1UL << 22UL)
146 #define PSYCHO_IOMMU_TAG_WRITE (0x1UL << 21UL)
147 #define PSYCHO_IOMMU_TAG_STREAM (0x1UL << 20UL)
148 #define PSYCHO_IOMMU_TAG_SIZE (0x1UL << 19UL)
149 #define PSYCHO_IOMMU_TAG_VPAGE 0x7ffffULL
150 #define PSYCHO_IOMMU_DATA_VALID (1UL << 30UL)
151 #define PSYCHO_IOMMU_DATA_CACHE (1UL << 28UL)
152 #define PSYCHO_IOMMU_DATA_PPAGE 0xfffffffULL
153
psycho_dump_iommu_tags_and_data(struct pci_pbm_info * pbm,u64 * tag,u64 * data)154 static void psycho_dump_iommu_tags_and_data(struct pci_pbm_info *pbm,
155 u64 *tag, u64 *data)
156 {
157 int i;
158
159 for (i = 0; i < 16; i++) {
160 u64 tag_val, data_val;
161 const char *type_str;
162 tag_val = tag[i];
163 if (!(tag_val & PSYCHO_IOMMU_TAG_ERR))
164 continue;
165
166 data_val = data[i];
167 switch((tag_val & PSYCHO_IOMMU_TAG_ERRSTS) >> 23UL) {
168 case 0:
169 type_str = "Protection Error";
170 break;
171 case 1:
172 type_str = "Invalid Error";
173 break;
174 case 2:
175 type_str = "TimeOut Error";
176 break;
177 case 3:
178 default:
179 type_str = "ECC Error";
180 break;
181 }
182
183 printk(KERN_ERR "%s: IOMMU TAG(%d)[error(%s) wr(%d) "
184 "str(%d) sz(%dK) vpg(%08llx)]\n",
185 pbm->name, i, type_str,
186 ((tag_val & PSYCHO_IOMMU_TAG_WRITE) ? 1 : 0),
187 ((tag_val & PSYCHO_IOMMU_TAG_STREAM) ? 1 : 0),
188 ((tag_val & PSYCHO_IOMMU_TAG_SIZE) ? 64 : 8),
189 (tag_val & PSYCHO_IOMMU_TAG_VPAGE) << IOMMU_PAGE_SHIFT);
190 printk(KERN_ERR "%s: IOMMU DATA(%d)[valid(%d) cache(%d) "
191 "ppg(%016llx)]\n",
192 pbm->name, i,
193 ((data_val & PSYCHO_IOMMU_DATA_VALID) ? 1 : 0),
194 ((data_val & PSYCHO_IOMMU_DATA_CACHE) ? 1 : 0),
195 (data_val & PSYCHO_IOMMU_DATA_PPAGE) << IOMMU_PAGE_SHIFT);
196 }
197 }
198
199 #define PSYCHO_IOMMU_CTRL_XLTESTAT 0x0000000006000000UL
200 #define PSYCHO_IOMMU_CTRL_XLTEERR 0x0000000001000000UL
201
psycho_check_iommu_error(struct pci_pbm_info * pbm,unsigned long afsr,unsigned long afar,enum psycho_error_type type)202 void psycho_check_iommu_error(struct pci_pbm_info *pbm,
203 unsigned long afsr,
204 unsigned long afar,
205 enum psycho_error_type type)
206 {
207 u64 control, iommu_tag[16], iommu_data[16];
208 struct iommu *iommu = pbm->iommu;
209 unsigned long flags;
210
211 spin_lock_irqsave(&iommu->lock, flags);
212 control = upa_readq(iommu->iommu_control);
213 if (control & PSYCHO_IOMMU_CTRL_XLTEERR) {
214 const char *type_str;
215
216 control &= ~PSYCHO_IOMMU_CTRL_XLTEERR;
217 upa_writeq(control, iommu->iommu_control);
218
219 switch ((control & PSYCHO_IOMMU_CTRL_XLTESTAT) >> 25UL) {
220 case 0:
221 type_str = "Protection Error";
222 break;
223 case 1:
224 type_str = "Invalid Error";
225 break;
226 case 2:
227 type_str = "TimeOut Error";
228 break;
229 case 3:
230 default:
231 type_str = "ECC Error";
232 break;
233 }
234 printk(KERN_ERR "%s: IOMMU Error, type[%s]\n",
235 pbm->name, type_str);
236
237 /* It is very possible for another DVMA to occur while
238 * we do this probe, and corrupt the system further.
239 * But we are so screwed at this point that we are
240 * likely to crash hard anyways, so get as much
241 * diagnostic information to the console as we can.
242 */
243 psycho_record_iommu_tags_and_data(pbm, iommu_tag, iommu_data);
244 psycho_dump_iommu_tags_and_data(pbm, iommu_tag, iommu_data);
245 }
246 psycho_check_stc_error(pbm);
247 spin_unlock_irqrestore(&iommu->lock, flags);
248 }
249
250 #define PSYCHO_PCICTRL_SBH_ERR 0x0000000800000000UL
251 #define PSYCHO_PCICTRL_SERR 0x0000000400000000UL
252
psycho_pcierr_intr_other(struct pci_pbm_info * pbm)253 static irqreturn_t psycho_pcierr_intr_other(struct pci_pbm_info *pbm)
254 {
255 irqreturn_t ret = IRQ_NONE;
256 u64 csr, csr_error_bits;
257 u16 stat, *addr;
258
259 csr = upa_readq(pbm->pci_csr);
260 csr_error_bits = csr & (PSYCHO_PCICTRL_SBH_ERR | PSYCHO_PCICTRL_SERR);
261 if (csr_error_bits) {
262 /* Clear the errors. */
263 upa_writeq(csr, pbm->pci_csr);
264
265 /* Log 'em. */
266 if (csr_error_bits & PSYCHO_PCICTRL_SBH_ERR)
267 printk(KERN_ERR "%s: PCI streaming byte hole "
268 "error asserted.\n", pbm->name);
269 if (csr_error_bits & PSYCHO_PCICTRL_SERR)
270 printk(KERN_ERR "%s: PCI SERR signal asserted.\n",
271 pbm->name);
272 ret = IRQ_HANDLED;
273 }
274 addr = psycho_pci_config_mkaddr(pbm, pbm->pci_first_busno,
275 0, PCI_STATUS);
276 pci_config_read16(addr, &stat);
277 if (stat & (PCI_STATUS_PARITY |
278 PCI_STATUS_SIG_TARGET_ABORT |
279 PCI_STATUS_REC_TARGET_ABORT |
280 PCI_STATUS_REC_MASTER_ABORT |
281 PCI_STATUS_SIG_SYSTEM_ERROR)) {
282 printk(KERN_ERR "%s: PCI bus error, PCI_STATUS[%04x]\n",
283 pbm->name, stat);
284 pci_config_write16(addr, 0xffff);
285 ret = IRQ_HANDLED;
286 }
287 return ret;
288 }
289
290 #define PSYCHO_PCIAFSR_PMA 0x8000000000000000ULL
291 #define PSYCHO_PCIAFSR_PTA 0x4000000000000000ULL
292 #define PSYCHO_PCIAFSR_PRTRY 0x2000000000000000ULL
293 #define PSYCHO_PCIAFSR_PPERR 0x1000000000000000ULL
294 #define PSYCHO_PCIAFSR_SMA 0x0800000000000000ULL
295 #define PSYCHO_PCIAFSR_STA 0x0400000000000000ULL
296 #define PSYCHO_PCIAFSR_SRTRY 0x0200000000000000ULL
297 #define PSYCHO_PCIAFSR_SPERR 0x0100000000000000ULL
298 #define PSYCHO_PCIAFSR_RESV1 0x00ff000000000000ULL
299 #define PSYCHO_PCIAFSR_BMSK 0x0000ffff00000000ULL
300 #define PSYCHO_PCIAFSR_BLK 0x0000000080000000ULL
301 #define PSYCHO_PCIAFSR_RESV2 0x0000000040000000ULL
302 #define PSYCHO_PCIAFSR_MID 0x000000003e000000ULL
303 #define PSYCHO_PCIAFSR_RESV3 0x0000000001ffffffULL
304
psycho_pcierr_intr(int irq,void * dev_id)305 irqreturn_t psycho_pcierr_intr(int irq, void *dev_id)
306 {
307 struct pci_pbm_info *pbm = dev_id;
308 u64 afsr, afar, error_bits;
309 int reported;
310
311 afsr = upa_readq(pbm->pci_afsr);
312 afar = upa_readq(pbm->pci_afar);
313 error_bits = afsr &
314 (PSYCHO_PCIAFSR_PMA | PSYCHO_PCIAFSR_PTA |
315 PSYCHO_PCIAFSR_PRTRY | PSYCHO_PCIAFSR_PPERR |
316 PSYCHO_PCIAFSR_SMA | PSYCHO_PCIAFSR_STA |
317 PSYCHO_PCIAFSR_SRTRY | PSYCHO_PCIAFSR_SPERR);
318 if (!error_bits)
319 return psycho_pcierr_intr_other(pbm);
320 upa_writeq(error_bits, pbm->pci_afsr);
321 printk(KERN_ERR "%s: PCI Error, primary error type[%s]\n",
322 pbm->name,
323 (((error_bits & PSYCHO_PCIAFSR_PMA) ?
324 "Master Abort" :
325 ((error_bits & PSYCHO_PCIAFSR_PTA) ?
326 "Target Abort" :
327 ((error_bits & PSYCHO_PCIAFSR_PRTRY) ?
328 "Excessive Retries" :
329 ((error_bits & PSYCHO_PCIAFSR_PPERR) ?
330 "Parity Error" : "???"))))));
331 printk(KERN_ERR "%s: bytemask[%04llx] UPA_MID[%02llx] was_block(%d)\n",
332 pbm->name,
333 (afsr & PSYCHO_PCIAFSR_BMSK) >> 32UL,
334 (afsr & PSYCHO_PCIAFSR_MID) >> 25UL,
335 (afsr & PSYCHO_PCIAFSR_BLK) ? 1 : 0);
336 printk(KERN_ERR "%s: PCI AFAR [%016llx]\n", pbm->name, afar);
337 printk(KERN_ERR "%s: PCI Secondary errors [", pbm->name);
338 reported = 0;
339 if (afsr & PSYCHO_PCIAFSR_SMA) {
340 reported++;
341 printk("(Master Abort)");
342 }
343 if (afsr & PSYCHO_PCIAFSR_STA) {
344 reported++;
345 printk("(Target Abort)");
346 }
347 if (afsr & PSYCHO_PCIAFSR_SRTRY) {
348 reported++;
349 printk("(Excessive Retries)");
350 }
351 if (afsr & PSYCHO_PCIAFSR_SPERR) {
352 reported++;
353 printk("(Parity Error)");
354 }
355 if (!reported)
356 printk("(none)");
357 printk("]\n");
358
359 if (error_bits & (PSYCHO_PCIAFSR_PTA | PSYCHO_PCIAFSR_STA)) {
360 psycho_check_iommu_error(pbm, afsr, afar, PCI_ERR);
361 pci_scan_for_target_abort(pbm, pbm->pci_bus);
362 }
363 if (error_bits & (PSYCHO_PCIAFSR_PMA | PSYCHO_PCIAFSR_SMA))
364 pci_scan_for_master_abort(pbm, pbm->pci_bus);
365
366 if (error_bits & (PSYCHO_PCIAFSR_PPERR | PSYCHO_PCIAFSR_SPERR))
367 pci_scan_for_parity_error(pbm, pbm->pci_bus);
368
369 return IRQ_HANDLED;
370 }
371
psycho_iommu_flush(struct pci_pbm_info * pbm)372 static void psycho_iommu_flush(struct pci_pbm_info *pbm)
373 {
374 int i;
375
376 for (i = 0; i < 16; i++) {
377 unsigned long off = i * 8;
378
379 upa_writeq(0, pbm->controller_regs + PSYCHO_IOMMU_TAG + off);
380 upa_writeq(0, pbm->controller_regs + PSYCHO_IOMMU_DATA + off);
381 }
382 }
383
384 #define PSYCHO_IOMMU_CONTROL 0x0200UL
385 #define PSYCHO_IOMMU_CTRL_TSBSZ 0x0000000000070000UL
386 #define PSYCHO_IOMMU_TSBSZ_1K 0x0000000000000000UL
387 #define PSYCHO_IOMMU_TSBSZ_2K 0x0000000000010000UL
388 #define PSYCHO_IOMMU_TSBSZ_4K 0x0000000000020000UL
389 #define PSYCHO_IOMMU_TSBSZ_8K 0x0000000000030000UL
390 #define PSYCHO_IOMMU_TSBSZ_16K 0x0000000000040000UL
391 #define PSYCHO_IOMMU_TSBSZ_32K 0x0000000000050000UL
392 #define PSYCHO_IOMMU_TSBSZ_64K 0x0000000000060000UL
393 #define PSYCHO_IOMMU_TSBSZ_128K 0x0000000000070000UL
394 #define PSYCHO_IOMMU_CTRL_TBWSZ 0x0000000000000004UL
395 #define PSYCHO_IOMMU_CTRL_DENAB 0x0000000000000002UL
396 #define PSYCHO_IOMMU_CTRL_ENAB 0x0000000000000001UL
397 #define PSYCHO_IOMMU_FLUSH 0x0210UL
398 #define PSYCHO_IOMMU_TSBBASE 0x0208UL
399
psycho_iommu_init(struct pci_pbm_info * pbm,int tsbsize,u32 dvma_offset,u32 dma_mask,unsigned long write_complete_offset)400 int psycho_iommu_init(struct pci_pbm_info *pbm, int tsbsize,
401 u32 dvma_offset, u32 dma_mask,
402 unsigned long write_complete_offset)
403 {
404 struct iommu *iommu = pbm->iommu;
405 u64 control;
406 int err;
407
408 iommu->iommu_control = pbm->controller_regs + PSYCHO_IOMMU_CONTROL;
409 iommu->iommu_tsbbase = pbm->controller_regs + PSYCHO_IOMMU_TSBBASE;
410 iommu->iommu_flush = pbm->controller_regs + PSYCHO_IOMMU_FLUSH;
411 iommu->iommu_tags = pbm->controller_regs + PSYCHO_IOMMU_TAG;
412 iommu->write_complete_reg = (pbm->controller_regs +
413 write_complete_offset);
414
415 iommu->iommu_ctxflush = 0;
416
417 control = upa_readq(iommu->iommu_control);
418 control |= PSYCHO_IOMMU_CTRL_DENAB;
419 upa_writeq(control, iommu->iommu_control);
420
421 psycho_iommu_flush(pbm);
422
423 /* Leave diag mode enabled for full-flushing done in pci_iommu.c */
424 err = iommu_table_init(iommu, tsbsize * 1024 * 8,
425 dvma_offset, dma_mask, pbm->numa_node);
426 if (err)
427 return err;
428
429 upa_writeq(__pa(iommu->page_table), iommu->iommu_tsbbase);
430
431 control = upa_readq(iommu->iommu_control);
432 control &= ~(PSYCHO_IOMMU_CTRL_TSBSZ | PSYCHO_IOMMU_CTRL_TBWSZ);
433 control |= PSYCHO_IOMMU_CTRL_ENAB;
434
435 switch (tsbsize) {
436 case 64:
437 control |= PSYCHO_IOMMU_TSBSZ_64K;
438 break;
439 case 128:
440 control |= PSYCHO_IOMMU_TSBSZ_128K;
441 break;
442 default:
443 return -EINVAL;
444 }
445
446 upa_writeq(control, iommu->iommu_control);
447
448 return 0;
449
450 }
451
psycho_pbm_init_common(struct pci_pbm_info * pbm,struct platform_device * op,const char * chip_name,int chip_type)452 void psycho_pbm_init_common(struct pci_pbm_info *pbm, struct platform_device *op,
453 const char *chip_name, int chip_type)
454 {
455 struct device_node *dp = op->dev.of_node;
456
457 pbm->name = dp->full_name;
458 pbm->numa_node = NUMA_NO_NODE;
459 pbm->chip_type = chip_type;
460 pbm->chip_version = of_getintprop_default(dp, "version#", 0);
461 pbm->chip_revision = of_getintprop_default(dp, "module-revision#", 0);
462 pbm->op = op;
463 pbm->pci_ops = &sun4u_pci_ops;
464 pbm->config_space_reg_bits = 8;
465 pbm->index = pci_num_pbms++;
466 pci_get_pbm_props(pbm);
467 pci_determine_mem_io_space(pbm);
468
469 printk(KERN_INFO "%s: %s PCI Bus Module ver[%x:%x]\n",
470 pbm->name, chip_name,
471 pbm->chip_version, pbm->chip_revision);
472 }
473
