1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 *
4 * Copyright (C) 2013 Freescale Semiconductor, Inc.
5 */
6
7 #define pr_fmt(fmt) "fsl-pamu: %s: " fmt, __func__
8
9 #include "fsl_pamu.h"
10
11 #include <linux/fsl/guts.h>
12 #include <linux/interrupt.h>
13 #include <linux/genalloc.h>
14
15 #include <asm/mpc85xx.h>
16
17 /* define indexes for each operation mapping scenario */
18 #define OMI_QMAN 0x00
19 #define OMI_FMAN 0x01
20 #define OMI_QMAN_PRIV 0x02
21 #define OMI_CAAM 0x03
22
23 #define make64(high, low) (((u64)(high) << 32) | (low))
24
25 struct pamu_isr_data {
26 void __iomem *pamu_reg_base; /* Base address of PAMU regs */
27 unsigned int count; /* The number of PAMUs */
28 };
29
30 static struct paace *ppaact;
31 static struct paace *spaact;
32
33 static bool probed; /* Has PAMU been probed? */
34
35 /*
36 * Table for matching compatible strings, for device tree
37 * guts node, for QorIQ SOCs.
38 * "fsl,qoriq-device-config-2.0" corresponds to T4 & B4
39 * SOCs. For the older SOCs "fsl,qoriq-device-config-1.0"
40 * string would be used.
41 */
42 static const struct of_device_id guts_device_ids[] = {
43 { .compatible = "fsl,qoriq-device-config-1.0", },
44 { .compatible = "fsl,qoriq-device-config-2.0", },
45 {}
46 };
47
48 /*
49 * Table for matching compatible strings, for device tree
50 * L3 cache controller node.
51 * "fsl,t4240-l3-cache-controller" corresponds to T4,
52 * "fsl,b4860-l3-cache-controller" corresponds to B4 &
53 * "fsl,p4080-l3-cache-controller" corresponds to other,
54 * SOCs.
55 */
56 static const struct of_device_id l3_device_ids[] = {
57 { .compatible = "fsl,t4240-l3-cache-controller", },
58 { .compatible = "fsl,b4860-l3-cache-controller", },
59 { .compatible = "fsl,p4080-l3-cache-controller", },
60 {}
61 };
62
63 /* maximum subwindows permitted per liodn */
64 static u32 max_subwindow_count;
65
66 /* Pool for fspi allocation */
67 static struct gen_pool *spaace_pool;
68
69 /**
70 * pamu_get_max_subwin_cnt() - Return the maximum supported
71 * subwindow count per liodn.
72 *
73 */
pamu_get_max_subwin_cnt(void)74 u32 pamu_get_max_subwin_cnt(void)
75 {
76 return max_subwindow_count;
77 }
78
79 /**
80 * pamu_get_ppaace() - Return the primary PACCE
81 * @liodn: liodn PAACT index for desired PAACE
82 *
83 * Returns the ppace pointer upon success else return
84 * null.
85 */
pamu_get_ppaace(int liodn)86 static struct paace *pamu_get_ppaace(int liodn)
87 {
88 if (!ppaact || liodn >= PAACE_NUMBER_ENTRIES) {
89 pr_debug("PPAACT doesn't exist\n");
90 return NULL;
91 }
92
93 return &ppaact[liodn];
94 }
95
96 /**
97 * pamu_enable_liodn() - Set valid bit of PACCE
98 * @liodn: liodn PAACT index for desired PAACE
99 *
100 * Returns 0 upon success else error code < 0 returned
101 */
pamu_enable_liodn(int liodn)102 int pamu_enable_liodn(int liodn)
103 {
104 struct paace *ppaace;
105
106 ppaace = pamu_get_ppaace(liodn);
107 if (!ppaace) {
108 pr_debug("Invalid primary paace entry\n");
109 return -ENOENT;
110 }
111
112 if (!get_bf(ppaace->addr_bitfields, PPAACE_AF_WSE)) {
113 pr_debug("liodn %d not configured\n", liodn);
114 return -EINVAL;
115 }
116
117 /* Ensure that all other stores to the ppaace complete first */
118 mb();
119
120 set_bf(ppaace->addr_bitfields, PAACE_AF_V, PAACE_V_VALID);
121 mb();
122
123 return 0;
124 }
125
126 /**
127 * pamu_disable_liodn() - Clears valid bit of PACCE
128 * @liodn: liodn PAACT index for desired PAACE
129 *
130 * Returns 0 upon success else error code < 0 returned
131 */
pamu_disable_liodn(int liodn)132 int pamu_disable_liodn(int liodn)
133 {
134 struct paace *ppaace;
135
136 ppaace = pamu_get_ppaace(liodn);
137 if (!ppaace) {
138 pr_debug("Invalid primary paace entry\n");
139 return -ENOENT;
140 }
141
142 set_bf(ppaace->addr_bitfields, PAACE_AF_V, PAACE_V_INVALID);
143 mb();
144
145 return 0;
146 }
147
148 /* Derive the window size encoding for a particular PAACE entry */
map_addrspace_size_to_wse(phys_addr_t addrspace_size)149 static unsigned int map_addrspace_size_to_wse(phys_addr_t addrspace_size)
150 {
151 /* Bug if not a power of 2 */
152 BUG_ON(addrspace_size & (addrspace_size - 1));
153
154 /* window size is 2^(WSE+1) bytes */
155 return fls64(addrspace_size) - 2;
156 }
157
158 /* Derive the PAACE window count encoding for the subwindow count */
map_subwindow_cnt_to_wce(u32 subwindow_cnt)159 static unsigned int map_subwindow_cnt_to_wce(u32 subwindow_cnt)
160 {
161 /* window count is 2^(WCE+1) bytes */
162 return __ffs(subwindow_cnt) - 1;
163 }
164
165 /*
166 * Set the PAACE type as primary and set the coherency required domain
167 * attribute
168 */
pamu_init_ppaace(struct paace * ppaace)169 static void pamu_init_ppaace(struct paace *ppaace)
170 {
171 set_bf(ppaace->addr_bitfields, PAACE_AF_PT, PAACE_PT_PRIMARY);
172
173 set_bf(ppaace->domain_attr.to_host.coherency_required, PAACE_DA_HOST_CR,
174 PAACE_M_COHERENCE_REQ);
175 }
176
177 /*
178 * Set the PAACE type as secondary and set the coherency required domain
179 * attribute.
180 */
pamu_init_spaace(struct paace * spaace)181 static void pamu_init_spaace(struct paace *spaace)
182 {
183 set_bf(spaace->addr_bitfields, PAACE_AF_PT, PAACE_PT_SECONDARY);
184 set_bf(spaace->domain_attr.to_host.coherency_required, PAACE_DA_HOST_CR,
185 PAACE_M_COHERENCE_REQ);
186 }
187
188 /*
189 * Return the spaace (corresponding to the secondary window index)
190 * for a particular ppaace.
191 */
pamu_get_spaace(struct paace * paace,u32 wnum)192 static struct paace *pamu_get_spaace(struct paace *paace, u32 wnum)
193 {
194 u32 subwin_cnt;
195 struct paace *spaace = NULL;
196
197 subwin_cnt = 1UL << (get_bf(paace->impl_attr, PAACE_IA_WCE) + 1);
198
199 if (wnum < subwin_cnt)
200 spaace = &spaact[paace->fspi + wnum];
201 else
202 pr_debug("secondary paace out of bounds\n");
203
204 return spaace;
205 }
206
207 /**
208 * pamu_get_fspi_and_allocate() - Allocates fspi index and reserves subwindows
209 * required for primary PAACE in the secondary
210 * PAACE table.
211 * @subwin_cnt: Number of subwindows to be reserved.
212 *
213 * A PPAACE entry may have a number of associated subwindows. A subwindow
214 * corresponds to a SPAACE entry in the SPAACT table. Each PAACE entry stores
215 * the index (fspi) of the first SPAACE entry in the SPAACT table. This
216 * function returns the index of the first SPAACE entry. The remaining
217 * SPAACE entries are reserved contiguously from that index.
218 *
219 * Returns a valid fspi index in the range of 0 - SPAACE_NUMBER_ENTRIES on success.
220 * If no SPAACE entry is available or the allocator can not reserve the required
221 * number of contiguous entries function returns ULONG_MAX indicating a failure.
222 *
223 */
pamu_get_fspi_and_allocate(u32 subwin_cnt)224 static unsigned long pamu_get_fspi_and_allocate(u32 subwin_cnt)
225 {
226 unsigned long spaace_addr;
227
228 spaace_addr = gen_pool_alloc(spaace_pool, subwin_cnt * sizeof(struct paace));
229 if (!spaace_addr)
230 return ULONG_MAX;
231
232 return (spaace_addr - (unsigned long)spaact) / (sizeof(struct paace));
233 }
234
235 /* Release the subwindows reserved for a particular LIODN */
pamu_free_subwins(int liodn)236 void pamu_free_subwins(int liodn)
237 {
238 struct paace *ppaace;
239 u32 subwin_cnt, size;
240
241 ppaace = pamu_get_ppaace(liodn);
242 if (!ppaace) {
243 pr_debug("Invalid liodn entry\n");
244 return;
245 }
246
247 if (get_bf(ppaace->addr_bitfields, PPAACE_AF_MW)) {
248 subwin_cnt = 1UL << (get_bf(ppaace->impl_attr, PAACE_IA_WCE) + 1);
249 size = (subwin_cnt - 1) * sizeof(struct paace);
250 gen_pool_free(spaace_pool, (unsigned long)&spaact[ppaace->fspi], size);
251 set_bf(ppaace->addr_bitfields, PPAACE_AF_MW, 0);
252 }
253 }
254
255 /*
256 * Function used for updating stash destination for the coressponding
257 * LIODN.
258 */
pamu_update_paace_stash(int liodn,u32 subwin,u32 value)259 int pamu_update_paace_stash(int liodn, u32 subwin, u32 value)
260 {
261 struct paace *paace;
262
263 paace = pamu_get_ppaace(liodn);
264 if (!paace) {
265 pr_debug("Invalid liodn entry\n");
266 return -ENOENT;
267 }
268 if (subwin) {
269 paace = pamu_get_spaace(paace, subwin - 1);
270 if (!paace)
271 return -ENOENT;
272 }
273 set_bf(paace->impl_attr, PAACE_IA_CID, value);
274
275 mb();
276
277 return 0;
278 }
279
280 /* Disable a subwindow corresponding to the LIODN */
pamu_disable_spaace(int liodn,u32 subwin)281 int pamu_disable_spaace(int liodn, u32 subwin)
282 {
283 struct paace *paace;
284
285 paace = pamu_get_ppaace(liodn);
286 if (!paace) {
287 pr_debug("Invalid liodn entry\n");
288 return -ENOENT;
289 }
290 if (subwin) {
291 paace = pamu_get_spaace(paace, subwin - 1);
292 if (!paace)
293 return -ENOENT;
294 set_bf(paace->addr_bitfields, PAACE_AF_V, PAACE_V_INVALID);
295 } else {
296 set_bf(paace->addr_bitfields, PAACE_AF_AP,
297 PAACE_AP_PERMS_DENIED);
298 }
299
300 mb();
301
302 return 0;
303 }
304
305 /**
306 * pamu_config_paace() - Sets up PPAACE entry for specified liodn
307 *
308 * @liodn: Logical IO device number
309 * @win_addr: starting address of DSA window
310 * @win-size: size of DSA window
311 * @omi: Operation mapping index -- if ~omi == 0 then omi not defined
312 * @rpn: real (true physical) page number
313 * @stashid: cache stash id for associated cpu -- if ~stashid == 0 then
314 * stashid not defined
315 * @snoopid: snoop id for hardware coherency -- if ~snoopid == 0 then
316 * snoopid not defined
317 * @subwin_cnt: number of sub-windows
318 * @prot: window permissions
319 *
320 * Returns 0 upon success else error code < 0 returned
321 */
pamu_config_ppaace(int liodn,phys_addr_t win_addr,phys_addr_t win_size,u32 omi,unsigned long rpn,u32 snoopid,u32 stashid,u32 subwin_cnt,int prot)322 int pamu_config_ppaace(int liodn, phys_addr_t win_addr, phys_addr_t win_size,
323 u32 omi, unsigned long rpn, u32 snoopid, u32 stashid,
324 u32 subwin_cnt, int prot)
325 {
326 struct paace *ppaace;
327 unsigned long fspi;
328
329 if ((win_size & (win_size - 1)) || win_size < PAMU_PAGE_SIZE) {
330 pr_debug("window size too small or not a power of two %pa\n",
331 &win_size);
332 return -EINVAL;
333 }
334
335 if (win_addr & (win_size - 1)) {
336 pr_debug("window address is not aligned with window size\n");
337 return -EINVAL;
338 }
339
340 ppaace = pamu_get_ppaace(liodn);
341 if (!ppaace)
342 return -ENOENT;
343
344 /* window size is 2^(WSE+1) bytes */
345 set_bf(ppaace->addr_bitfields, PPAACE_AF_WSE,
346 map_addrspace_size_to_wse(win_size));
347
348 pamu_init_ppaace(ppaace);
349
350 ppaace->wbah = win_addr >> (PAMU_PAGE_SHIFT + 20);
351 set_bf(ppaace->addr_bitfields, PPAACE_AF_WBAL,
352 (win_addr >> PAMU_PAGE_SHIFT));
353
354 /* set up operation mapping if it's configured */
355 if (omi < OME_NUMBER_ENTRIES) {
356 set_bf(ppaace->impl_attr, PAACE_IA_OTM, PAACE_OTM_INDEXED);
357 ppaace->op_encode.index_ot.omi = omi;
358 } else if (~omi != 0) {
359 pr_debug("bad operation mapping index: %d\n", omi);
360 return -EINVAL;
361 }
362
363 /* configure stash id */
364 if (~stashid != 0)
365 set_bf(ppaace->impl_attr, PAACE_IA_CID, stashid);
366
367 /* configure snoop id */
368 if (~snoopid != 0)
369 ppaace->domain_attr.to_host.snpid = snoopid;
370
371 if (subwin_cnt) {
372 /* The first entry is in the primary PAACE instead */
373 fspi = pamu_get_fspi_and_allocate(subwin_cnt - 1);
374 if (fspi == ULONG_MAX) {
375 pr_debug("spaace indexes exhausted\n");
376 return -EINVAL;
377 }
378
379 /* window count is 2^(WCE+1) bytes */
380 set_bf(ppaace->impl_attr, PAACE_IA_WCE,
381 map_subwindow_cnt_to_wce(subwin_cnt));
382 set_bf(ppaace->addr_bitfields, PPAACE_AF_MW, 0x1);
383 ppaace->fspi = fspi;
384 } else {
385 set_bf(ppaace->impl_attr, PAACE_IA_ATM, PAACE_ATM_WINDOW_XLATE);
386 ppaace->twbah = rpn >> 20;
387 set_bf(ppaace->win_bitfields, PAACE_WIN_TWBAL, rpn);
388 set_bf(ppaace->addr_bitfields, PAACE_AF_AP, prot);
389 set_bf(ppaace->impl_attr, PAACE_IA_WCE, 0);
390 set_bf(ppaace->addr_bitfields, PPAACE_AF_MW, 0);
391 }
392 mb();
393
394 return 0;
395 }
396
397 /**
398 * pamu_config_spaace() - Sets up SPAACE entry for specified subwindow
399 *
400 * @liodn: Logical IO device number
401 * @subwin_cnt: number of sub-windows associated with dma-window
402 * @subwin: subwindow index
403 * @subwin_size: size of subwindow
404 * @omi: Operation mapping index
405 * @rpn: real (true physical) page number
406 * @snoopid: snoop id for hardware coherency -- if ~snoopid == 0 then
407 * snoopid not defined
408 * @stashid: cache stash id for associated cpu
409 * @enable: enable/disable subwindow after reconfiguration
410 * @prot: sub window permissions
411 *
412 * Returns 0 upon success else error code < 0 returned
413 */
pamu_config_spaace(int liodn,u32 subwin_cnt,u32 subwin,phys_addr_t subwin_size,u32 omi,unsigned long rpn,u32 snoopid,u32 stashid,int enable,int prot)414 int pamu_config_spaace(int liodn, u32 subwin_cnt, u32 subwin,
415 phys_addr_t subwin_size, u32 omi, unsigned long rpn,
416 u32 snoopid, u32 stashid, int enable, int prot)
417 {
418 struct paace *paace;
419
420 /* setup sub-windows */
421 if (!subwin_cnt) {
422 pr_debug("Invalid subwindow count\n");
423 return -EINVAL;
424 }
425
426 paace = pamu_get_ppaace(liodn);
427 if (subwin > 0 && subwin < subwin_cnt && paace) {
428 paace = pamu_get_spaace(paace, subwin - 1);
429
430 if (paace && !(paace->addr_bitfields & PAACE_V_VALID)) {
431 pamu_init_spaace(paace);
432 set_bf(paace->addr_bitfields, SPAACE_AF_LIODN, liodn);
433 }
434 }
435
436 if (!paace) {
437 pr_debug("Invalid liodn entry\n");
438 return -ENOENT;
439 }
440
441 if ((subwin_size & (subwin_size - 1)) || subwin_size < PAMU_PAGE_SIZE) {
442 pr_debug("subwindow size out of range, or not a power of 2\n");
443 return -EINVAL;
444 }
445
446 if (rpn == ULONG_MAX) {
447 pr_debug("real page number out of range\n");
448 return -EINVAL;
449 }
450
451 /* window size is 2^(WSE+1) bytes */
452 set_bf(paace->win_bitfields, PAACE_WIN_SWSE,
453 map_addrspace_size_to_wse(subwin_size));
454
455 set_bf(paace->impl_attr, PAACE_IA_ATM, PAACE_ATM_WINDOW_XLATE);
456 paace->twbah = rpn >> 20;
457 set_bf(paace->win_bitfields, PAACE_WIN_TWBAL, rpn);
458 set_bf(paace->addr_bitfields, PAACE_AF_AP, prot);
459
460 /* configure snoop id */
461 if (~snoopid != 0)
462 paace->domain_attr.to_host.snpid = snoopid;
463
464 /* set up operation mapping if it's configured */
465 if (omi < OME_NUMBER_ENTRIES) {
466 set_bf(paace->impl_attr, PAACE_IA_OTM, PAACE_OTM_INDEXED);
467 paace->op_encode.index_ot.omi = omi;
468 } else if (~omi != 0) {
469 pr_debug("bad operation mapping index: %d\n", omi);
470 return -EINVAL;
471 }
472
473 if (~stashid != 0)
474 set_bf(paace->impl_attr, PAACE_IA_CID, stashid);
475
476 smp_wmb();
477
478 if (enable)
479 set_bf(paace->addr_bitfields, PAACE_AF_V, PAACE_V_VALID);
480
481 mb();
482
483 return 0;
484 }
485
486 /**
487 * get_ome_index() - Returns the index in the operation mapping table
488 * for device.
489 * @*omi_index: pointer for storing the index value
490 *
491 */
get_ome_index(u32 * omi_index,struct device * dev)492 void get_ome_index(u32 *omi_index, struct device *dev)
493 {
494 if (of_device_is_compatible(dev->of_node, "fsl,qman-portal"))
495 *omi_index = OMI_QMAN;
496 if (of_device_is_compatible(dev->of_node, "fsl,qman"))
497 *omi_index = OMI_QMAN_PRIV;
498 }
499
500 /**
501 * get_stash_id - Returns stash destination id corresponding to a
502 * cache type and vcpu.
503 * @stash_dest_hint: L1, L2 or L3
504 * @vcpu: vpcu target for a particular cache type.
505 *
506 * Returs stash on success or ~(u32)0 on failure.
507 *
508 */
get_stash_id(u32 stash_dest_hint,u32 vcpu)509 u32 get_stash_id(u32 stash_dest_hint, u32 vcpu)
510 {
511 const u32 *prop;
512 struct device_node *node;
513 u32 cache_level;
514 int len, found = 0;
515 int i;
516
517 /* Fastpath, exit early if L3/CPC cache is target for stashing */
518 if (stash_dest_hint == PAMU_ATTR_CACHE_L3) {
519 node = of_find_matching_node(NULL, l3_device_ids);
520 if (node) {
521 prop = of_get_property(node, "cache-stash-id", NULL);
522 if (!prop) {
523 pr_debug("missing cache-stash-id at %pOF\n",
524 node);
525 of_node_put(node);
526 return ~(u32)0;
527 }
528 of_node_put(node);
529 return be32_to_cpup(prop);
530 }
531 return ~(u32)0;
532 }
533
534 for_each_of_cpu_node(node) {
535 prop = of_get_property(node, "reg", &len);
536 for (i = 0; i < len / sizeof(u32); i++) {
537 if (be32_to_cpup(&prop[i]) == vcpu) {
538 found = 1;
539 goto found_cpu_node;
540 }
541 }
542 }
543 found_cpu_node:
544
545 /* find the hwnode that represents the cache */
546 for (cache_level = PAMU_ATTR_CACHE_L1; (cache_level < PAMU_ATTR_CACHE_L3) && found; cache_level++) {
547 if (stash_dest_hint == cache_level) {
548 prop = of_get_property(node, "cache-stash-id", NULL);
549 if (!prop) {
550 pr_debug("missing cache-stash-id at %pOF\n",
551 node);
552 of_node_put(node);
553 return ~(u32)0;
554 }
555 of_node_put(node);
556 return be32_to_cpup(prop);
557 }
558
559 prop = of_get_property(node, "next-level-cache", NULL);
560 if (!prop) {
561 pr_debug("can't find next-level-cache at %pOF\n", node);
562 of_node_put(node);
563 return ~(u32)0; /* can't traverse any further */
564 }
565 of_node_put(node);
566
567 /* advance to next node in cache hierarchy */
568 node = of_find_node_by_phandle(*prop);
569 if (!node) {
570 pr_debug("Invalid node for cache hierarchy\n");
571 return ~(u32)0;
572 }
573 }
574
575 pr_debug("stash dest not found for %d on vcpu %d\n",
576 stash_dest_hint, vcpu);
577 return ~(u32)0;
578 }
579
580 /* Identify if the PAACT table entry belongs to QMAN, BMAN or QMAN Portal */
581 #define QMAN_PAACE 1
582 #define QMAN_PORTAL_PAACE 2
583 #define BMAN_PAACE 3
584
585 /**
586 * Setup operation mapping and stash destinations for QMAN and QMAN portal.
587 * Memory accesses to QMAN and BMAN private memory need not be coherent, so
588 * clear the PAACE entry coherency attribute for them.
589 */
setup_qbman_paace(struct paace * ppaace,int paace_type)590 static void setup_qbman_paace(struct paace *ppaace, int paace_type)
591 {
592 switch (paace_type) {
593 case QMAN_PAACE:
594 set_bf(ppaace->impl_attr, PAACE_IA_OTM, PAACE_OTM_INDEXED);
595 ppaace->op_encode.index_ot.omi = OMI_QMAN_PRIV;
596 /* setup QMAN Private data stashing for the L3 cache */
597 set_bf(ppaace->impl_attr, PAACE_IA_CID, get_stash_id(PAMU_ATTR_CACHE_L3, 0));
598 set_bf(ppaace->domain_attr.to_host.coherency_required, PAACE_DA_HOST_CR,
599 0);
600 break;
601 case QMAN_PORTAL_PAACE:
602 set_bf(ppaace->impl_attr, PAACE_IA_OTM, PAACE_OTM_INDEXED);
603 ppaace->op_encode.index_ot.omi = OMI_QMAN;
604 /* Set DQRR and Frame stashing for the L3 cache */
605 set_bf(ppaace->impl_attr, PAACE_IA_CID, get_stash_id(PAMU_ATTR_CACHE_L3, 0));
606 break;
607 case BMAN_PAACE:
608 set_bf(ppaace->domain_attr.to_host.coherency_required, PAACE_DA_HOST_CR,
609 0);
610 break;
611 }
612 }
613
614 /**
615 * Setup the operation mapping table for various devices. This is a static
616 * table where each table index corresponds to a particular device. PAMU uses
617 * this table to translate device transaction to appropriate corenet
618 * transaction.
619 */
setup_omt(struct ome * omt)620 static void setup_omt(struct ome *omt)
621 {
622 struct ome *ome;
623
624 /* Configure OMI_QMAN */
625 ome = &omt[OMI_QMAN];
626
627 ome->moe[IOE_READ_IDX] = EOE_VALID | EOE_READ;
628 ome->moe[IOE_EREAD0_IDX] = EOE_VALID | EOE_RSA;
629 ome->moe[IOE_WRITE_IDX] = EOE_VALID | EOE_WRITE;
630 ome->moe[IOE_EWRITE0_IDX] = EOE_VALID | EOE_WWSAO;
631
632 ome->moe[IOE_DIRECT0_IDX] = EOE_VALID | EOE_LDEC;
633 ome->moe[IOE_DIRECT1_IDX] = EOE_VALID | EOE_LDECPE;
634
635 /* Configure OMI_FMAN */
636 ome = &omt[OMI_FMAN];
637 ome->moe[IOE_READ_IDX] = EOE_VALID | EOE_READI;
638 ome->moe[IOE_WRITE_IDX] = EOE_VALID | EOE_WRITE;
639
640 /* Configure OMI_QMAN private */
641 ome = &omt[OMI_QMAN_PRIV];
642 ome->moe[IOE_READ_IDX] = EOE_VALID | EOE_READ;
643 ome->moe[IOE_WRITE_IDX] = EOE_VALID | EOE_WRITE;
644 ome->moe[IOE_EREAD0_IDX] = EOE_VALID | EOE_RSA;
645 ome->moe[IOE_EWRITE0_IDX] = EOE_VALID | EOE_WWSA;
646
647 /* Configure OMI_CAAM */
648 ome = &omt[OMI_CAAM];
649 ome->moe[IOE_READ_IDX] = EOE_VALID | EOE_READI;
650 ome->moe[IOE_WRITE_IDX] = EOE_VALID | EOE_WRITE;
651 }
652
653 /*
654 * Get the maximum number of PAACT table entries
655 * and subwindows supported by PAMU
656 */
get_pamu_cap_values(unsigned long pamu_reg_base)657 static void get_pamu_cap_values(unsigned long pamu_reg_base)
658 {
659 u32 pc_val;
660
661 pc_val = in_be32((u32 *)(pamu_reg_base + PAMU_PC3));
662 /* Maximum number of subwindows per liodn */
663 max_subwindow_count = 1 << (1 + PAMU_PC3_MWCE(pc_val));
664 }
665
666 /* Setup PAMU registers pointing to PAACT, SPAACT and OMT */
setup_one_pamu(unsigned long pamu_reg_base,unsigned long pamu_reg_size,phys_addr_t ppaact_phys,phys_addr_t spaact_phys,phys_addr_t omt_phys)667 static int setup_one_pamu(unsigned long pamu_reg_base, unsigned long pamu_reg_size,
668 phys_addr_t ppaact_phys, phys_addr_t spaact_phys,
669 phys_addr_t omt_phys)
670 {
671 u32 *pc;
672 struct pamu_mmap_regs *pamu_regs;
673
674 pc = (u32 *) (pamu_reg_base + PAMU_PC);
675 pamu_regs = (struct pamu_mmap_regs *)
676 (pamu_reg_base + PAMU_MMAP_REGS_BASE);
677
678 /* set up pointers to corenet control blocks */
679
680 out_be32(&pamu_regs->ppbah, upper_32_bits(ppaact_phys));
681 out_be32(&pamu_regs->ppbal, lower_32_bits(ppaact_phys));
682 ppaact_phys = ppaact_phys + PAACT_SIZE;
683 out_be32(&pamu_regs->pplah, upper_32_bits(ppaact_phys));
684 out_be32(&pamu_regs->pplal, lower_32_bits(ppaact_phys));
685
686 out_be32(&pamu_regs->spbah, upper_32_bits(spaact_phys));
687 out_be32(&pamu_regs->spbal, lower_32_bits(spaact_phys));
688 spaact_phys = spaact_phys + SPAACT_SIZE;
689 out_be32(&pamu_regs->splah, upper_32_bits(spaact_phys));
690 out_be32(&pamu_regs->splal, lower_32_bits(spaact_phys));
691
692 out_be32(&pamu_regs->obah, upper_32_bits(omt_phys));
693 out_be32(&pamu_regs->obal, lower_32_bits(omt_phys));
694 omt_phys = omt_phys + OMT_SIZE;
695 out_be32(&pamu_regs->olah, upper_32_bits(omt_phys));
696 out_be32(&pamu_regs->olal, lower_32_bits(omt_phys));
697
698 /*
699 * set PAMU enable bit,
700 * allow ppaact & omt to be cached
701 * & enable PAMU access violation interrupts.
702 */
703
704 out_be32((u32 *)(pamu_reg_base + PAMU_PICS),
705 PAMU_ACCESS_VIOLATION_ENABLE);
706 out_be32(pc, PAMU_PC_PE | PAMU_PC_OCE | PAMU_PC_SPCC | PAMU_PC_PPCC);
707 return 0;
708 }
709
710 /* Enable all device LIODNS */
setup_liodns(void)711 static void setup_liodns(void)
712 {
713 int i, len;
714 struct paace *ppaace;
715 struct device_node *node = NULL;
716 const u32 *prop;
717
718 for_each_node_with_property(node, "fsl,liodn") {
719 prop = of_get_property(node, "fsl,liodn", &len);
720 for (i = 0; i < len / sizeof(u32); i++) {
721 int liodn;
722
723 liodn = be32_to_cpup(&prop[i]);
724 if (liodn >= PAACE_NUMBER_ENTRIES) {
725 pr_debug("Invalid LIODN value %d\n", liodn);
726 continue;
727 }
728 ppaace = pamu_get_ppaace(liodn);
729 pamu_init_ppaace(ppaace);
730 /* window size is 2^(WSE+1) bytes */
731 set_bf(ppaace->addr_bitfields, PPAACE_AF_WSE, 35);
732 ppaace->wbah = 0;
733 set_bf(ppaace->addr_bitfields, PPAACE_AF_WBAL, 0);
734 set_bf(ppaace->impl_attr, PAACE_IA_ATM,
735 PAACE_ATM_NO_XLATE);
736 set_bf(ppaace->addr_bitfields, PAACE_AF_AP,
737 PAACE_AP_PERMS_ALL);
738 if (of_device_is_compatible(node, "fsl,qman-portal"))
739 setup_qbman_paace(ppaace, QMAN_PORTAL_PAACE);
740 if (of_device_is_compatible(node, "fsl,qman"))
741 setup_qbman_paace(ppaace, QMAN_PAACE);
742 if (of_device_is_compatible(node, "fsl,bman"))
743 setup_qbman_paace(ppaace, BMAN_PAACE);
744 mb();
745 pamu_enable_liodn(liodn);
746 }
747 }
748 }
749
pamu_av_isr(int irq,void * arg)750 static irqreturn_t pamu_av_isr(int irq, void *arg)
751 {
752 struct pamu_isr_data *data = arg;
753 phys_addr_t phys;
754 unsigned int i, j, ret;
755
756 pr_emerg("access violation interrupt\n");
757
758 for (i = 0; i < data->count; i++) {
759 void __iomem *p = data->pamu_reg_base + i * PAMU_OFFSET;
760 u32 pics = in_be32(p + PAMU_PICS);
761
762 if (pics & PAMU_ACCESS_VIOLATION_STAT) {
763 u32 avs1 = in_be32(p + PAMU_AVS1);
764 struct paace *paace;
765
766 pr_emerg("POES1=%08x\n", in_be32(p + PAMU_POES1));
767 pr_emerg("POES2=%08x\n", in_be32(p + PAMU_POES2));
768 pr_emerg("AVS1=%08x\n", avs1);
769 pr_emerg("AVS2=%08x\n", in_be32(p + PAMU_AVS2));
770 pr_emerg("AVA=%016llx\n",
771 make64(in_be32(p + PAMU_AVAH),
772 in_be32(p + PAMU_AVAL)));
773 pr_emerg("UDAD=%08x\n", in_be32(p + PAMU_UDAD));
774 pr_emerg("POEA=%016llx\n",
775 make64(in_be32(p + PAMU_POEAH),
776 in_be32(p + PAMU_POEAL)));
777
778 phys = make64(in_be32(p + PAMU_POEAH),
779 in_be32(p + PAMU_POEAL));
780
781 /* Assume that POEA points to a PAACE */
782 if (phys) {
783 u32 *paace = phys_to_virt(phys);
784
785 /* Only the first four words are relevant */
786 for (j = 0; j < 4; j++)
787 pr_emerg("PAACE[%u]=%08x\n",
788 j, in_be32(paace + j));
789 }
790
791 /* clear access violation condition */
792 out_be32(p + PAMU_AVS1, avs1 & PAMU_AV_MASK);
793 paace = pamu_get_ppaace(avs1 >> PAMU_AVS1_LIODN_SHIFT);
794 BUG_ON(!paace);
795 /* check if we got a violation for a disabled LIODN */
796 if (!get_bf(paace->addr_bitfields, PAACE_AF_V)) {
797 /*
798 * As per hardware erratum A-003638, access
799 * violation can be reported for a disabled
800 * LIODN. If we hit that condition, disable
801 * access violation reporting.
802 */
803 pics &= ~PAMU_ACCESS_VIOLATION_ENABLE;
804 } else {
805 /* Disable the LIODN */
806 ret = pamu_disable_liodn(avs1 >> PAMU_AVS1_LIODN_SHIFT);
807 BUG_ON(ret);
808 pr_emerg("Disabling liodn %x\n",
809 avs1 >> PAMU_AVS1_LIODN_SHIFT);
810 }
811 out_be32((p + PAMU_PICS), pics);
812 }
813 }
814
815 return IRQ_HANDLED;
816 }
817
818 #define LAWAR_EN 0x80000000
819 #define LAWAR_TARGET_MASK 0x0FF00000
820 #define LAWAR_TARGET_SHIFT 20
821 #define LAWAR_SIZE_MASK 0x0000003F
822 #define LAWAR_CSDID_MASK 0x000FF000
823 #define LAWAR_CSDID_SHIFT 12
824
825 #define LAW_SIZE_4K 0xb
826
827 struct ccsr_law {
828 u32 lawbarh; /* LAWn base address high */
829 u32 lawbarl; /* LAWn base address low */
830 u32 lawar; /* LAWn attributes */
831 u32 reserved;
832 };
833
834 /*
835 * Create a coherence subdomain for a given memory block.
836 */
create_csd(phys_addr_t phys,size_t size,u32 csd_port_id)837 static int create_csd(phys_addr_t phys, size_t size, u32 csd_port_id)
838 {
839 struct device_node *np;
840 const __be32 *iprop;
841 void __iomem *lac = NULL; /* Local Access Control registers */
842 struct ccsr_law __iomem *law;
843 void __iomem *ccm = NULL;
844 u32 __iomem *csdids;
845 unsigned int i, num_laws, num_csds;
846 u32 law_target = 0;
847 u32 csd_id = 0;
848 int ret = 0;
849
850 np = of_find_compatible_node(NULL, NULL, "fsl,corenet-law");
851 if (!np)
852 return -ENODEV;
853
854 iprop = of_get_property(np, "fsl,num-laws", NULL);
855 if (!iprop) {
856 ret = -ENODEV;
857 goto error;
858 }
859
860 num_laws = be32_to_cpup(iprop);
861 if (!num_laws) {
862 ret = -ENODEV;
863 goto error;
864 }
865
866 lac = of_iomap(np, 0);
867 if (!lac) {
868 ret = -ENODEV;
869 goto error;
870 }
871
872 /* LAW registers are at offset 0xC00 */
873 law = lac + 0xC00;
874
875 of_node_put(np);
876
877 np = of_find_compatible_node(NULL, NULL, "fsl,corenet-cf");
878 if (!np) {
879 ret = -ENODEV;
880 goto error;
881 }
882
883 iprop = of_get_property(np, "fsl,ccf-num-csdids", NULL);
884 if (!iprop) {
885 ret = -ENODEV;
886 goto error;
887 }
888
889 num_csds = be32_to_cpup(iprop);
890 if (!num_csds) {
891 ret = -ENODEV;
892 goto error;
893 }
894
895 ccm = of_iomap(np, 0);
896 if (!ccm) {
897 ret = -ENOMEM;
898 goto error;
899 }
900
901 /* The undocumented CSDID registers are at offset 0x600 */
902 csdids = ccm + 0x600;
903
904 of_node_put(np);
905 np = NULL;
906
907 /* Find an unused coherence subdomain ID */
908 for (csd_id = 0; csd_id < num_csds; csd_id++) {
909 if (!csdids[csd_id])
910 break;
911 }
912
913 /* Store the Port ID in the (undocumented) proper CIDMRxx register */
914 csdids[csd_id] = csd_port_id;
915
916 /* Find the DDR LAW that maps to our buffer. */
917 for (i = 0; i < num_laws; i++) {
918 if (law[i].lawar & LAWAR_EN) {
919 phys_addr_t law_start, law_end;
920
921 law_start = make64(law[i].lawbarh, law[i].lawbarl);
922 law_end = law_start +
923 (2ULL << (law[i].lawar & LAWAR_SIZE_MASK));
924
925 if (law_start <= phys && phys < law_end) {
926 law_target = law[i].lawar & LAWAR_TARGET_MASK;
927 break;
928 }
929 }
930 }
931
932 if (i == 0 || i == num_laws) {
933 /* This should never happen */
934 ret = -ENOENT;
935 goto error;
936 }
937
938 /* Find a free LAW entry */
939 while (law[--i].lawar & LAWAR_EN) {
940 if (i == 0) {
941 /* No higher priority LAW slots available */
942 ret = -ENOENT;
943 goto error;
944 }
945 }
946
947 law[i].lawbarh = upper_32_bits(phys);
948 law[i].lawbarl = lower_32_bits(phys);
949 wmb();
950 law[i].lawar = LAWAR_EN | law_target | (csd_id << LAWAR_CSDID_SHIFT) |
951 (LAW_SIZE_4K + get_order(size));
952 wmb();
953
954 error:
955 if (ccm)
956 iounmap(ccm);
957
958 if (lac)
959 iounmap(lac);
960
961 if (np)
962 of_node_put(np);
963
964 return ret;
965 }
966
967 /*
968 * Table of SVRs and the corresponding PORT_ID values. Port ID corresponds to a
969 * bit map of snoopers for a given range of memory mapped by a LAW.
970 *
971 * All future CoreNet-enabled SOCs will have this erratum(A-004510) fixed, so this
972 * table should never need to be updated. SVRs are guaranteed to be unique, so
973 * there is no worry that a future SOC will inadvertently have one of these
974 * values.
975 */
976 static const struct {
977 u32 svr;
978 u32 port_id;
979 } port_id_map[] = {
980 {(SVR_P2040 << 8) | 0x10, 0xFF000000}, /* P2040 1.0 */
981 {(SVR_P2040 << 8) | 0x11, 0xFF000000}, /* P2040 1.1 */
982 {(SVR_P2041 << 8) | 0x10, 0xFF000000}, /* P2041 1.0 */
983 {(SVR_P2041 << 8) | 0x11, 0xFF000000}, /* P2041 1.1 */
984 {(SVR_P3041 << 8) | 0x10, 0xFF000000}, /* P3041 1.0 */
985 {(SVR_P3041 << 8) | 0x11, 0xFF000000}, /* P3041 1.1 */
986 {(SVR_P4040 << 8) | 0x20, 0xFFF80000}, /* P4040 2.0 */
987 {(SVR_P4080 << 8) | 0x20, 0xFFF80000}, /* P4080 2.0 */
988 {(SVR_P5010 << 8) | 0x10, 0xFC000000}, /* P5010 1.0 */
989 {(SVR_P5010 << 8) | 0x20, 0xFC000000}, /* P5010 2.0 */
990 {(SVR_P5020 << 8) | 0x10, 0xFC000000}, /* P5020 1.0 */
991 {(SVR_P5021 << 8) | 0x10, 0xFF800000}, /* P5021 1.0 */
992 {(SVR_P5040 << 8) | 0x10, 0xFF800000}, /* P5040 1.0 */
993 };
994
995 #define SVR_SECURITY 0x80000 /* The Security (E) bit */
996
fsl_pamu_probe(struct platform_device * pdev)997 static int fsl_pamu_probe(struct platform_device *pdev)
998 {
999 struct device *dev = &pdev->dev;
1000 void __iomem *pamu_regs = NULL;
1001 struct ccsr_guts __iomem *guts_regs = NULL;
1002 u32 pamubypenr, pamu_counter;
1003 unsigned long pamu_reg_off;
1004 unsigned long pamu_reg_base;
1005 struct pamu_isr_data *data = NULL;
1006 struct device_node *guts_node;
1007 u64 size;
1008 struct page *p;
1009 int ret = 0;
1010 int irq;
1011 phys_addr_t ppaact_phys;
1012 phys_addr_t spaact_phys;
1013 struct ome *omt;
1014 phys_addr_t omt_phys;
1015 size_t mem_size = 0;
1016 unsigned int order = 0;
1017 u32 csd_port_id = 0;
1018 unsigned i;
1019 /*
1020 * enumerate all PAMUs and allocate and setup PAMU tables
1021 * for each of them,
1022 * NOTE : All PAMUs share the same LIODN tables.
1023 */
1024
1025 if (WARN_ON(probed))
1026 return -EBUSY;
1027
1028 pamu_regs = of_iomap(dev->of_node, 0);
1029 if (!pamu_regs) {
1030 dev_err(dev, "ioremap of PAMU node failed\n");
1031 return -ENOMEM;
1032 }
1033 of_get_address(dev->of_node, 0, &size, NULL);
1034
1035 irq = irq_of_parse_and_map(dev->of_node, 0);
1036 if (irq == NO_IRQ) {
1037 dev_warn(dev, "no interrupts listed in PAMU node\n");
1038 goto error;
1039 }
1040
1041 data = kzalloc(sizeof(*data), GFP_KERNEL);
1042 if (!data) {
1043 ret = -ENOMEM;
1044 goto error;
1045 }
1046 data->pamu_reg_base = pamu_regs;
1047 data->count = size / PAMU_OFFSET;
1048
1049 /* The ISR needs access to the regs, so we won't iounmap them */
1050 ret = request_irq(irq, pamu_av_isr, 0, "pamu", data);
1051 if (ret < 0) {
1052 dev_err(dev, "error %i installing ISR for irq %i\n", ret, irq);
1053 goto error;
1054 }
1055
1056 guts_node = of_find_matching_node(NULL, guts_device_ids);
1057 if (!guts_node) {
1058 dev_err(dev, "could not find GUTS node %pOF\n", dev->of_node);
1059 ret = -ENODEV;
1060 goto error;
1061 }
1062
1063 guts_regs = of_iomap(guts_node, 0);
1064 of_node_put(guts_node);
1065 if (!guts_regs) {
1066 dev_err(dev, "ioremap of GUTS node failed\n");
1067 ret = -ENODEV;
1068 goto error;
1069 }
1070
1071 /* read in the PAMU capability registers */
1072 get_pamu_cap_values((unsigned long)pamu_regs);
1073 /*
1074 * To simplify the allocation of a coherency domain, we allocate the
1075 * PAACT and the OMT in the same memory buffer. Unfortunately, this
1076 * wastes more memory compared to allocating the buffers separately.
1077 */
1078 /* Determine how much memory we need */
1079 mem_size = (PAGE_SIZE << get_order(PAACT_SIZE)) +
1080 (PAGE_SIZE << get_order(SPAACT_SIZE)) +
1081 (PAGE_SIZE << get_order(OMT_SIZE));
1082 order = get_order(mem_size);
1083
1084 p = alloc_pages(GFP_KERNEL | __GFP_ZERO, order);
1085 if (!p) {
1086 dev_err(dev, "unable to allocate PAACT/SPAACT/OMT block\n");
1087 ret = -ENOMEM;
1088 goto error;
1089 }
1090
1091 ppaact = page_address(p);
1092 ppaact_phys = page_to_phys(p);
1093
1094 /* Make sure the memory is naturally aligned */
1095 if (ppaact_phys & ((PAGE_SIZE << order) - 1)) {
1096 dev_err(dev, "PAACT/OMT block is unaligned\n");
1097 ret = -ENOMEM;
1098 goto error;
1099 }
1100
1101 spaact = (void *)ppaact + (PAGE_SIZE << get_order(PAACT_SIZE));
1102 omt = (void *)spaact + (PAGE_SIZE << get_order(SPAACT_SIZE));
1103
1104 dev_dbg(dev, "ppaact virt=%p phys=%pa\n", ppaact, &ppaact_phys);
1105
1106 /* Check to see if we need to implement the work-around on this SOC */
1107
1108 /* Determine the Port ID for our coherence subdomain */
1109 for (i = 0; i < ARRAY_SIZE(port_id_map); i++) {
1110 if (port_id_map[i].svr == (mfspr(SPRN_SVR) & ~SVR_SECURITY)) {
1111 csd_port_id = port_id_map[i].port_id;
1112 dev_dbg(dev, "found matching SVR %08x\n",
1113 port_id_map[i].svr);
1114 break;
1115 }
1116 }
1117
1118 if (csd_port_id) {
1119 dev_dbg(dev, "creating coherency subdomain at address %pa, size %zu, port id 0x%08x",
1120 &ppaact_phys, mem_size, csd_port_id);
1121
1122 ret = create_csd(ppaact_phys, mem_size, csd_port_id);
1123 if (ret) {
1124 dev_err(dev, "could not create coherence subdomain\n");
1125 return ret;
1126 }
1127 }
1128
1129 spaact_phys = virt_to_phys(spaact);
1130 omt_phys = virt_to_phys(omt);
1131
1132 spaace_pool = gen_pool_create(ilog2(sizeof(struct paace)), -1);
1133 if (!spaace_pool) {
1134 ret = -ENOMEM;
1135 dev_err(dev, "Failed to allocate spaace gen pool\n");
1136 goto error;
1137 }
1138
1139 ret = gen_pool_add(spaace_pool, (unsigned long)spaact, SPAACT_SIZE, -1);
1140 if (ret)
1141 goto error_genpool;
1142
1143 pamubypenr = in_be32(&guts_regs->pamubypenr);
1144
1145 for (pamu_reg_off = 0, pamu_counter = 0x80000000; pamu_reg_off < size;
1146 pamu_reg_off += PAMU_OFFSET, pamu_counter >>= 1) {
1147
1148 pamu_reg_base = (unsigned long)pamu_regs + pamu_reg_off;
1149 setup_one_pamu(pamu_reg_base, pamu_reg_off, ppaact_phys,
1150 spaact_phys, omt_phys);
1151 /* Disable PAMU bypass for this PAMU */
1152 pamubypenr &= ~pamu_counter;
1153 }
1154
1155 setup_omt(omt);
1156
1157 /* Enable all relevant PAMU(s) */
1158 out_be32(&guts_regs->pamubypenr, pamubypenr);
1159
1160 iounmap(guts_regs);
1161
1162 /* Enable DMA for the LIODNs in the device tree */
1163
1164 setup_liodns();
1165
1166 probed = true;
1167
1168 return 0;
1169
1170 error_genpool:
1171 gen_pool_destroy(spaace_pool);
1172
1173 error:
1174 if (irq != NO_IRQ)
1175 free_irq(irq, data);
1176
1177 kfree_sensitive(data);
1178
1179 if (pamu_regs)
1180 iounmap(pamu_regs);
1181
1182 if (guts_regs)
1183 iounmap(guts_regs);
1184
1185 if (ppaact)
1186 free_pages((unsigned long)ppaact, order);
1187
1188 ppaact = NULL;
1189
1190 return ret;
1191 }
1192
1193 static struct platform_driver fsl_of_pamu_driver = {
1194 .driver = {
1195 .name = "fsl-of-pamu",
1196 },
1197 .probe = fsl_pamu_probe,
1198 };
1199
fsl_pamu_init(void)1200 static __init int fsl_pamu_init(void)
1201 {
1202 struct platform_device *pdev = NULL;
1203 struct device_node *np;
1204 int ret;
1205
1206 /*
1207 * The normal OF process calls the probe function at some
1208 * indeterminate later time, after most drivers have loaded. This is
1209 * too late for us, because PAMU clients (like the Qman driver)
1210 * depend on PAMU being initialized early.
1211 *
1212 * So instead, we "manually" call our probe function by creating the
1213 * platform devices ourselves.
1214 */
1215
1216 /*
1217 * We assume that there is only one PAMU node in the device tree. A
1218 * single PAMU node represents all of the PAMU devices in the SOC
1219 * already. Everything else already makes that assumption, and the
1220 * binding for the PAMU nodes doesn't allow for any parent-child
1221 * relationships anyway. In other words, support for more than one
1222 * PAMU node would require significant changes to a lot of code.
1223 */
1224
1225 np = of_find_compatible_node(NULL, NULL, "fsl,pamu");
1226 if (!np) {
1227 pr_err("could not find a PAMU node\n");
1228 return -ENODEV;
1229 }
1230
1231 ret = platform_driver_register(&fsl_of_pamu_driver);
1232 if (ret) {
1233 pr_err("could not register driver (err=%i)\n", ret);
1234 goto error_driver_register;
1235 }
1236
1237 pdev = platform_device_alloc("fsl-of-pamu", 0);
1238 if (!pdev) {
1239 pr_err("could not allocate device %pOF\n", np);
1240 ret = -ENOMEM;
1241 goto error_device_alloc;
1242 }
1243 pdev->dev.of_node = of_node_get(np);
1244
1245 ret = pamu_domain_init();
1246 if (ret)
1247 goto error_device_add;
1248
1249 ret = platform_device_add(pdev);
1250 if (ret) {
1251 pr_err("could not add device %pOF (err=%i)\n", np, ret);
1252 goto error_device_add;
1253 }
1254
1255 return 0;
1256
1257 error_device_add:
1258 of_node_put(pdev->dev.of_node);
1259 pdev->dev.of_node = NULL;
1260
1261 platform_device_put(pdev);
1262
1263 error_device_alloc:
1264 platform_driver_unregister(&fsl_of_pamu_driver);
1265
1266 error_driver_register:
1267 of_node_put(np);
1268
1269 return ret;
1270 }
1271 arch_initcall(fsl_pamu_init);
1272
