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[mirror_ubuntu-kernels.git] / arch / mips / pci / ops-tx4927.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Define the pci_ops for the PCIC on Toshiba TX4927, TX4938, etc.
4 *
5 * Based on linux/arch/mips/pci/ops-tx4938.c,
6 * linux/arch/mips/pci/fixup-rbtx4938.c,
7 * linux/arch/mips/txx9/rbtx4938/setup.c,
8 * and RBTX49xx patch from CELF patch archive.
9 *
10 * 2003-2005 (c) MontaVista Software, Inc.
11 * Copyright (C) 2004 by Ralf Baechle (ralf@linux-mips.org)
12 * (C) Copyright TOSHIBA CORPORATION 2000-2001, 2004-2007
13 */
14 #include <linux/kernel.h>
15 #include <linux/interrupt.h>
16 #include <linux/irq.h>
17 #include <asm/txx9/pci.h>
18 #include <asm/txx9/tx4927pcic.h>
19
20 static struct {
21 struct pci_controller *channel;
22 struct tx4927_pcic_reg __iomem *pcicptr;
23 } pcicptrs[2]; /* TX4938 has 2 pcic */
24
25 static void __init set_tx4927_pcicptr(struct pci_controller *channel,
26 struct tx4927_pcic_reg __iomem *pcicptr)
27 {
28 int i;
29
30 for (i = 0; i < ARRAY_SIZE(pcicptrs); i++) {
31 if (pcicptrs[i].channel == channel) {
32 pcicptrs[i].pcicptr = pcicptr;
33 return;
34 }
35 }
36 for (i = 0; i < ARRAY_SIZE(pcicptrs); i++) {
37 if (!pcicptrs[i].channel) {
38 pcicptrs[i].channel = channel;
39 pcicptrs[i].pcicptr = pcicptr;
40 return;
41 }
42 }
43 BUG();
44 }
45
46 struct tx4927_pcic_reg __iomem *get_tx4927_pcicptr(
47 struct pci_controller *channel)
48 {
49 int i;
50
51 for (i = 0; i < ARRAY_SIZE(pcicptrs); i++) {
52 if (pcicptrs[i].channel == channel)
53 return pcicptrs[i].pcicptr;
54 }
55 return NULL;
56 }
57
58 static int mkaddr(struct pci_bus *bus, unsigned int devfn, int where,
59 struct tx4927_pcic_reg __iomem *pcicptr)
60 {
61 if (bus->parent == NULL &&
62 devfn >= PCI_DEVFN(TX4927_PCIC_MAX_DEVNU, 0))
63 return -1;
64 __raw_writel(((bus->number & 0xff) << 0x10)
65 | ((devfn & 0xff) << 0x08) | (where & 0xfc)
66 | (bus->parent ? 1 : 0),
67 &pcicptr->g2pcfgadrs);
68 /* clear M_ABORT and Disable M_ABORT Int. */
69 __raw_writel((__raw_readl(&pcicptr->pcistatus) & 0x0000ffff)
70 | (PCI_STATUS_REC_MASTER_ABORT << 16),
71 &pcicptr->pcistatus);
72 return 0;
73 }
74
75 static int check_abort(struct tx4927_pcic_reg __iomem *pcicptr)
76 {
77 int code = PCIBIOS_SUCCESSFUL;
78
79 /* wait write cycle completion before checking error status */
80 while (__raw_readl(&pcicptr->pcicstatus) & TX4927_PCIC_PCICSTATUS_IWB)
81 ;
82 if (__raw_readl(&pcicptr->pcistatus)
83 & (PCI_STATUS_REC_MASTER_ABORT << 16)) {
84 __raw_writel((__raw_readl(&pcicptr->pcistatus) & 0x0000ffff)
85 | (PCI_STATUS_REC_MASTER_ABORT << 16),
86 &pcicptr->pcistatus);
87 /* flush write buffer */
88 iob();
89 code = PCIBIOS_DEVICE_NOT_FOUND;
90 }
91 return code;
92 }
93
94 static u8 icd_readb(int offset, struct tx4927_pcic_reg __iomem *pcicptr)
95 {
96 #ifdef __BIG_ENDIAN
97 offset ^= 3;
98 #endif
99 return __raw_readb((void __iomem *)&pcicptr->g2pcfgdata + offset);
100 }
101 static u16 icd_readw(int offset, struct tx4927_pcic_reg __iomem *pcicptr)
102 {
103 #ifdef __BIG_ENDIAN
104 offset ^= 2;
105 #endif
106 return __raw_readw((void __iomem *)&pcicptr->g2pcfgdata + offset);
107 }
108 static u32 icd_readl(struct tx4927_pcic_reg __iomem *pcicptr)
109 {
110 return __raw_readl(&pcicptr->g2pcfgdata);
111 }
112 static void icd_writeb(u8 val, int offset,
113 struct tx4927_pcic_reg __iomem *pcicptr)
114 {
115 #ifdef __BIG_ENDIAN
116 offset ^= 3;
117 #endif
118 __raw_writeb(val, (void __iomem *)&pcicptr->g2pcfgdata + offset);
119 }
120 static void icd_writew(u16 val, int offset,
121 struct tx4927_pcic_reg __iomem *pcicptr)
122 {
123 #ifdef __BIG_ENDIAN
124 offset ^= 2;
125 #endif
126 __raw_writew(val, (void __iomem *)&pcicptr->g2pcfgdata + offset);
127 }
128 static void icd_writel(u32 val, struct tx4927_pcic_reg __iomem *pcicptr)
129 {
130 __raw_writel(val, &pcicptr->g2pcfgdata);
131 }
132
133 static struct tx4927_pcic_reg __iomem *pci_bus_to_pcicptr(struct pci_bus *bus)
134 {
135 struct pci_controller *channel = bus->sysdata;
136 return get_tx4927_pcicptr(channel);
137 }
138
139 static int tx4927_pci_config_read(struct pci_bus *bus, unsigned int devfn,
140 int where, int size, u32 *val)
141 {
142 struct tx4927_pcic_reg __iomem *pcicptr = pci_bus_to_pcicptr(bus);
143
144 if (mkaddr(bus, devfn, where, pcicptr)) {
145 *val = 0xffffffff;
146 return -1;
147 }
148 switch (size) {
149 case 1:
150 *val = icd_readb(where & 3, pcicptr);
151 break;
152 case 2:
153 *val = icd_readw(where & 3, pcicptr);
154 break;
155 default:
156 *val = icd_readl(pcicptr);
157 }
158 return check_abort(pcicptr);
159 }
160
161 static int tx4927_pci_config_write(struct pci_bus *bus, unsigned int devfn,
162 int where, int size, u32 val)
163 {
164 struct tx4927_pcic_reg __iomem *pcicptr = pci_bus_to_pcicptr(bus);
165
166 if (mkaddr(bus, devfn, where, pcicptr))
167 return -1;
168 switch (size) {
169 case 1:
170 icd_writeb(val, where & 3, pcicptr);
171 break;
172 case 2:
173 icd_writew(val, where & 3, pcicptr);
174 break;
175 default:
176 icd_writel(val, pcicptr);
177 }
178 return check_abort(pcicptr);
179 }
180
181 static struct pci_ops tx4927_pci_ops = {
182 .read = tx4927_pci_config_read,
183 .write = tx4927_pci_config_write,
184 };
185
186 static struct {
187 u8 trdyto;
188 u8 retryto;
189 u16 gbwc;
190 } tx4927_pci_opts = {
191 .trdyto = 0,
192 .retryto = 0,
193 .gbwc = 0xfe0, /* 4064 GBUSCLK for CCFG.GTOT=0b11 */
194 };
195
196 char *tx4927_pcibios_setup(char *str)
197 {
198 if (!strncmp(str, "trdyto=", 7)) {
199 u8 val = 0;
200 if (kstrtou8(str + 7, 0, &val) == 0)
201 tx4927_pci_opts.trdyto = val;
202 return NULL;
203 }
204 if (!strncmp(str, "retryto=", 8)) {
205 u8 val = 0;
206 if (kstrtou8(str + 8, 0, &val) == 0)
207 tx4927_pci_opts.retryto = val;
208 return NULL;
209 }
210 if (!strncmp(str, "gbwc=", 5)) {
211 u16 val;
212 if (kstrtou16(str + 5, 0, &val) == 0)
213 tx4927_pci_opts.gbwc = val;
214 return NULL;
215 }
216 return str;
217 }
218
219 void __init tx4927_pcic_setup(struct tx4927_pcic_reg __iomem *pcicptr,
220 struct pci_controller *channel, int extarb)
221 {
222 int i;
223 unsigned long flags;
224
225 set_tx4927_pcicptr(channel, pcicptr);
226
227 if (!channel->pci_ops)
228 printk(KERN_INFO
229 "PCIC -- DID:%04x VID:%04x RID:%02x Arbiter:%s\n",
230 __raw_readl(&pcicptr->pciid) >> 16,
231 __raw_readl(&pcicptr->pciid) & 0xffff,
232 __raw_readl(&pcicptr->pciccrev) & 0xff,
233 extarb ? "External" : "Internal");
234 channel->pci_ops = &tx4927_pci_ops;
235
236 local_irq_save(flags);
237
238 /* Disable All Initiator Space */
239 __raw_writel(__raw_readl(&pcicptr->pciccfg)
240 & ~(TX4927_PCIC_PCICCFG_G2PMEN(0)
241 | TX4927_PCIC_PCICCFG_G2PMEN(1)
242 | TX4927_PCIC_PCICCFG_G2PMEN(2)
243 | TX4927_PCIC_PCICCFG_G2PIOEN),
244 &pcicptr->pciccfg);
245
246 /* GB->PCI mappings */
247 __raw_writel((channel->io_resource->end - channel->io_resource->start)
248 >> 4,
249 &pcicptr->g2piomask);
250 ____raw_writeq((channel->io_resource->start +
251 channel->io_map_base - IO_BASE) |
252 #ifdef __BIG_ENDIAN
253 TX4927_PCIC_G2PIOGBASE_ECHG
254 #else
255 TX4927_PCIC_G2PIOGBASE_BSDIS
256 #endif
257 , &pcicptr->g2piogbase);
258 ____raw_writeq(channel->io_resource->start - channel->io_offset,
259 &pcicptr->g2piopbase);
260 for (i = 0; i < 3; i++) {
261 __raw_writel(0, &pcicptr->g2pmmask[i]);
262 ____raw_writeq(0, &pcicptr->g2pmgbase[i]);
263 ____raw_writeq(0, &pcicptr->g2pmpbase[i]);
264 }
265 if (channel->mem_resource->end) {
266 __raw_writel((channel->mem_resource->end
267 - channel->mem_resource->start) >> 4,
268 &pcicptr->g2pmmask[0]);
269 ____raw_writeq(channel->mem_resource->start |
270 #ifdef __BIG_ENDIAN
271 TX4927_PCIC_G2PMnGBASE_ECHG
272 #else
273 TX4927_PCIC_G2PMnGBASE_BSDIS
274 #endif
275 , &pcicptr->g2pmgbase[0]);
276 ____raw_writeq(channel->mem_resource->start -
277 channel->mem_offset,
278 &pcicptr->g2pmpbase[0]);
279 }
280 /* PCI->GB mappings (I/O 256B) */
281 __raw_writel(0, &pcicptr->p2giopbase); /* 256B */
282 ____raw_writeq(0, &pcicptr->p2giogbase);
283 /* PCI->GB mappings (MEM 512MB (64MB on R1.x)) */
284 __raw_writel(0, &pcicptr->p2gm0plbase);
285 __raw_writel(0, &pcicptr->p2gm0pubase);
286 ____raw_writeq(TX4927_PCIC_P2GMnGBASE_TMEMEN |
287 #ifdef __BIG_ENDIAN
288 TX4927_PCIC_P2GMnGBASE_TECHG
289 #else
290 TX4927_PCIC_P2GMnGBASE_TBSDIS
291 #endif
292 , &pcicptr->p2gmgbase[0]);
293 /* PCI->GB mappings (MEM 16MB) */
294 __raw_writel(0xffffffff, &pcicptr->p2gm1plbase);
295 __raw_writel(0xffffffff, &pcicptr->p2gm1pubase);
296 ____raw_writeq(0, &pcicptr->p2gmgbase[1]);
297 /* PCI->GB mappings (MEM 1MB) */
298 __raw_writel(0xffffffff, &pcicptr->p2gm2pbase); /* 1MB */
299 ____raw_writeq(0, &pcicptr->p2gmgbase[2]);
300
301 /* Clear all (including IRBER) except for GBWC */
302 __raw_writel((tx4927_pci_opts.gbwc << 16)
303 & TX4927_PCIC_PCICCFG_GBWC_MASK,
304 &pcicptr->pciccfg);
305 /* Enable Initiator Memory Space */
306 if (channel->mem_resource->end)
307 __raw_writel(__raw_readl(&pcicptr->pciccfg)
308 | TX4927_PCIC_PCICCFG_G2PMEN(0),
309 &pcicptr->pciccfg);
310 /* Enable Initiator I/O Space */
311 if (channel->io_resource->end)
312 __raw_writel(__raw_readl(&pcicptr->pciccfg)
313 | TX4927_PCIC_PCICCFG_G2PIOEN,
314 &pcicptr->pciccfg);
315 /* Enable Initiator Config */
316 __raw_writel(__raw_readl(&pcicptr->pciccfg)
317 | TX4927_PCIC_PCICCFG_ICAEN | TX4927_PCIC_PCICCFG_TCAR,
318 &pcicptr->pciccfg);
319
320 /* Do not use MEMMUL, MEMINF: YMFPCI card causes M_ABORT. */
321 __raw_writel(0, &pcicptr->pcicfg1);
322
323 __raw_writel((__raw_readl(&pcicptr->g2ptocnt) & ~0xffff)
324 | (tx4927_pci_opts.trdyto & 0xff)
325 | ((tx4927_pci_opts.retryto & 0xff) << 8),
326 &pcicptr->g2ptocnt);
327
328 /* Clear All Local Bus Status */
329 __raw_writel(TX4927_PCIC_PCICSTATUS_ALL, &pcicptr->pcicstatus);
330 /* Enable All Local Bus Interrupts */
331 __raw_writel(TX4927_PCIC_PCICSTATUS_ALL, &pcicptr->pcicmask);
332 /* Clear All Initiator Status */
333 __raw_writel(TX4927_PCIC_G2PSTATUS_ALL, &pcicptr->g2pstatus);
334 /* Enable All Initiator Interrupts */
335 __raw_writel(TX4927_PCIC_G2PSTATUS_ALL, &pcicptr->g2pmask);
336 /* Clear All PCI Status Error */
337 __raw_writel((__raw_readl(&pcicptr->pcistatus) & 0x0000ffff)
338 | (TX4927_PCIC_PCISTATUS_ALL << 16),
339 &pcicptr->pcistatus);
340 /* Enable All PCI Status Error Interrupts */
341 __raw_writel(TX4927_PCIC_PCISTATUS_ALL, &pcicptr->pcimask);
342
343 if (!extarb) {
344 /* Reset Bus Arbiter */
345 __raw_writel(TX4927_PCIC_PBACFG_RPBA, &pcicptr->pbacfg);
346 __raw_writel(0, &pcicptr->pbabm);
347 /* Enable Bus Arbiter */
348 __raw_writel(TX4927_PCIC_PBACFG_PBAEN, &pcicptr->pbacfg);
349 }
350
351 __raw_writel(PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY
352 | PCI_COMMAND_PARITY | PCI_COMMAND_SERR,
353 &pcicptr->pcistatus);
354 local_irq_restore(flags);
355
356 printk(KERN_DEBUG
357 "PCI: COMMAND=%04x,PCIMASK=%04x,"
358 "TRDYTO=%02x,RETRYTO=%02x,GBWC=%03x\n",
359 __raw_readl(&pcicptr->pcistatus) & 0xffff,
360 __raw_readl(&pcicptr->pcimask) & 0xffff,
361 __raw_readl(&pcicptr->g2ptocnt) & 0xff,
362 (__raw_readl(&pcicptr->g2ptocnt) & 0xff00) >> 8,
363 (__raw_readl(&pcicptr->pciccfg) >> 16) & 0xfff);
364 }
365
366 static void tx4927_report_pcic_status1(struct tx4927_pcic_reg __iomem *pcicptr)
367 {
368 __u16 pcistatus = (__u16)(__raw_readl(&pcicptr->pcistatus) >> 16);
369 __u32 g2pstatus = __raw_readl(&pcicptr->g2pstatus);
370 __u32 pcicstatus = __raw_readl(&pcicptr->pcicstatus);
371 static struct {
372 __u32 flag;
373 const char *str;
374 } pcistat_tbl[] = {
375 { PCI_STATUS_DETECTED_PARITY, "DetectedParityError" },
376 { PCI_STATUS_SIG_SYSTEM_ERROR, "SignaledSystemError" },
377 { PCI_STATUS_REC_MASTER_ABORT, "ReceivedMasterAbort" },
378 { PCI_STATUS_REC_TARGET_ABORT, "ReceivedTargetAbort" },
379 { PCI_STATUS_SIG_TARGET_ABORT, "SignaledTargetAbort" },
380 { PCI_STATUS_PARITY, "MasterParityError" },
381 }, g2pstat_tbl[] = {
382 { TX4927_PCIC_G2PSTATUS_TTOE, "TIOE" },
383 { TX4927_PCIC_G2PSTATUS_RTOE, "RTOE" },
384 }, pcicstat_tbl[] = {
385 { TX4927_PCIC_PCICSTATUS_PME, "PME" },
386 { TX4927_PCIC_PCICSTATUS_TLB, "TLB" },
387 { TX4927_PCIC_PCICSTATUS_NIB, "NIB" },
388 { TX4927_PCIC_PCICSTATUS_ZIB, "ZIB" },
389 { TX4927_PCIC_PCICSTATUS_PERR, "PERR" },
390 { TX4927_PCIC_PCICSTATUS_SERR, "SERR" },
391 { TX4927_PCIC_PCICSTATUS_GBE, "GBE" },
392 { TX4927_PCIC_PCICSTATUS_IWB, "IWB" },
393 };
394 int i, cont;
395
396 printk(KERN_ERR "");
397 if (pcistatus & TX4927_PCIC_PCISTATUS_ALL) {
398 printk(KERN_CONT "pcistat:%04x(", pcistatus);
399 for (i = 0, cont = 0; i < ARRAY_SIZE(pcistat_tbl); i++)
400 if (pcistatus & pcistat_tbl[i].flag)
401 printk(KERN_CONT "%s%s",
402 cont++ ? " " : "", pcistat_tbl[i].str);
403 printk(KERN_CONT ") ");
404 }
405 if (g2pstatus & TX4927_PCIC_G2PSTATUS_ALL) {
406 printk(KERN_CONT "g2pstatus:%08x(", g2pstatus);
407 for (i = 0, cont = 0; i < ARRAY_SIZE(g2pstat_tbl); i++)
408 if (g2pstatus & g2pstat_tbl[i].flag)
409 printk(KERN_CONT "%s%s",
410 cont++ ? " " : "", g2pstat_tbl[i].str);
411 printk(KERN_CONT ") ");
412 }
413 if (pcicstatus & TX4927_PCIC_PCICSTATUS_ALL) {
414 printk(KERN_CONT "pcicstatus:%08x(", pcicstatus);
415 for (i = 0, cont = 0; i < ARRAY_SIZE(pcicstat_tbl); i++)
416 if (pcicstatus & pcicstat_tbl[i].flag)
417 printk(KERN_CONT "%s%s",
418 cont++ ? " " : "", pcicstat_tbl[i].str);
419 printk(KERN_CONT ")");
420 }
421 printk(KERN_CONT "\n");
422 }
423
424 void tx4927_report_pcic_status(void)
425 {
426 int i;
427
428 for (i = 0; i < ARRAY_SIZE(pcicptrs); i++) {
429 if (pcicptrs[i].pcicptr)
430 tx4927_report_pcic_status1(pcicptrs[i].pcicptr);
431 }
432 }
433
434 static void tx4927_dump_pcic_settings1(struct tx4927_pcic_reg __iomem *pcicptr)
435 {
436 int i;
437 __u32 __iomem *preg = (__u32 __iomem *)pcicptr;
438
439 printk(KERN_INFO "tx4927 pcic (0x%p) settings:", pcicptr);
440 for (i = 0; i < sizeof(struct tx4927_pcic_reg); i += 4, preg++) {
441 if (i % 32 == 0) {
442 printk(KERN_CONT "\n");
443 printk(KERN_INFO "%04x:", i);
444 }
445 /* skip registers with side-effects */
446 if (i == offsetof(struct tx4927_pcic_reg, g2pintack)
447 || i == offsetof(struct tx4927_pcic_reg, g2pspc)
448 || i == offsetof(struct tx4927_pcic_reg, g2pcfgadrs)
449 || i == offsetof(struct tx4927_pcic_reg, g2pcfgdata)) {
450 printk(KERN_CONT " XXXXXXXX");
451 continue;
452 }
453 printk(KERN_CONT " %08x", __raw_readl(preg));
454 }
455 printk(KERN_CONT "\n");
456 }
457
458 void tx4927_dump_pcic_settings(void)
459 {
460 int i;
461
462 for (i = 0; i < ARRAY_SIZE(pcicptrs); i++) {
463 if (pcicptrs[i].pcicptr)
464 tx4927_dump_pcic_settings1(pcicptrs[i].pcicptr);
465 }
466 }
467
468 irqreturn_t tx4927_pcierr_interrupt(int irq, void *dev_id)
469 {
470 struct pt_regs *regs = get_irq_regs();
471 struct tx4927_pcic_reg __iomem *pcicptr =
472 (struct tx4927_pcic_reg __iomem *)(unsigned long)dev_id;
473
474 if (txx9_pci_err_action != TXX9_PCI_ERR_IGNORE) {
475 printk(KERN_WARNING "PCIERR interrupt at 0x%0*lx\n",
476 (int)(2 * sizeof(unsigned long)), regs->cp0_epc);
477 tx4927_report_pcic_status1(pcicptr);
478 }
479 if (txx9_pci_err_action != TXX9_PCI_ERR_PANIC) {
480 /* clear all pci errors */
481 __raw_writel((__raw_readl(&pcicptr->pcistatus) & 0x0000ffff)
482 | (TX4927_PCIC_PCISTATUS_ALL << 16),
483 &pcicptr->pcistatus);
484 __raw_writel(TX4927_PCIC_G2PSTATUS_ALL, &pcicptr->g2pstatus);
485 __raw_writel(TX4927_PCIC_PBASTATUS_ALL, &pcicptr->pbastatus);
486 __raw_writel(TX4927_PCIC_PCICSTATUS_ALL, &pcicptr->pcicstatus);
487 return IRQ_HANDLED;
488 }
489 console_verbose();
490 tx4927_dump_pcic_settings1(pcicptr);
491 panic("PCI error.");
492 }
493
494 #ifdef CONFIG_TOSHIBA_FPCIB0
495 static void tx4927_quirk_slc90e66_bridge(struct pci_dev *dev)
496 {
497 struct tx4927_pcic_reg __iomem *pcicptr = pci_bus_to_pcicptr(dev->bus);
498
499 if (!pcicptr)
500 return;
501 if (__raw_readl(&pcicptr->pbacfg) & TX4927_PCIC_PBACFG_PBAEN) {
502 /* Reset Bus Arbiter */
503 __raw_writel(TX4927_PCIC_PBACFG_RPBA, &pcicptr->pbacfg);
504 /*
505 * swap reqBP and reqXP (raise priority of SLC90E66).
506 * SLC90E66(PCI-ISA bridge) is connected to REQ2 on
507 * PCI Backplane board.
508 */
509 __raw_writel(0x72543610, &pcicptr->pbareqport);
510 __raw_writel(0, &pcicptr->pbabm);
511 /* Use Fixed ParkMaster (required by SLC90E66) */
512 __raw_writel(TX4927_PCIC_PBACFG_FIXPA, &pcicptr->pbacfg);
513 /* Enable Bus Arbiter */
514 __raw_writel(TX4927_PCIC_PBACFG_FIXPA |
515 TX4927_PCIC_PBACFG_PBAEN,
516 &pcicptr->pbacfg);
517 printk(KERN_INFO "PCI: Use Fixed Park Master (REQPORT %08x)\n",
518 __raw_readl(&pcicptr->pbareqport));
519 }
520 }
521 #define PCI_DEVICE_ID_EFAR_SLC90E66_0 0x9460
522 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_EFAR, PCI_DEVICE_ID_EFAR_SLC90E66_0,
523 tx4927_quirk_slc90e66_bridge);
524 #endif
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