Commit | Line | Data |
---|---|---|
0c7b1df6 PM |
1 | /* |
2 | * arch/sh/mm/pmb.c | |
3 | * | |
4 | * Privileged Space Mapping Buffer (PMB) Support. | |
5 | * | |
3d467676 MF |
6 | * Copyright (C) 2005 - 2010 Paul Mundt |
7 | * Copyright (C) 2010 Matt Fleming | |
0c7b1df6 PM |
8 | * |
9 | * This file is subject to the terms and conditions of the GNU General Public | |
10 | * License. See the file "COPYING" in the main directory of this archive | |
11 | * for more details. | |
12 | */ | |
13 | #include <linux/init.h> | |
14 | #include <linux/kernel.h> | |
a83c0b73 FV |
15 | #include <linux/sysdev.h> |
16 | #include <linux/cpu.h> | |
0c7b1df6 PM |
17 | #include <linux/module.h> |
18 | #include <linux/slab.h> | |
19 | #include <linux/bitops.h> | |
20 | #include <linux/debugfs.h> | |
21 | #include <linux/fs.h> | |
22 | #include <linux/seq_file.h> | |
23 | #include <linux/err.h> | |
51becfd9 | 24 | #include <linux/io.h> |
d53a0d33 | 25 | #include <linux/spinlock.h> |
90e7d649 | 26 | #include <linux/vmalloc.h> |
51becfd9 | 27 | #include <asm/sizes.h> |
0c7b1df6 PM |
28 | #include <asm/system.h> |
29 | #include <asm/uaccess.h> | |
d7cdc9e8 | 30 | #include <asm/pgtable.h> |
7bdda620 | 31 | #include <asm/page.h> |
0c7b1df6 | 32 | #include <asm/mmu.h> |
eddeeb32 | 33 | #include <asm/mmu_context.h> |
0c7b1df6 | 34 | |
d53a0d33 PM |
35 | struct pmb_entry; |
36 | ||
37 | struct pmb_entry { | |
38 | unsigned long vpn; | |
39 | unsigned long ppn; | |
40 | unsigned long flags; | |
41 | unsigned long size; | |
42 | ||
43 | spinlock_t lock; | |
44 | ||
45 | /* | |
46 | * 0 .. NR_PMB_ENTRIES for specific entry selection, or | |
47 | * PMB_NO_ENTRY to search for a free one | |
48 | */ | |
49 | int entry; | |
50 | ||
51 | /* Adjacent entry link for contiguous multi-entry mappings */ | |
52 | struct pmb_entry *link; | |
53 | }; | |
54 | ||
90e7d649 PM |
55 | static struct { |
56 | unsigned long size; | |
57 | int flag; | |
58 | } pmb_sizes[] = { | |
59 | { .size = SZ_512M, .flag = PMB_SZ_512M, }, | |
60 | { .size = SZ_128M, .flag = PMB_SZ_128M, }, | |
61 | { .size = SZ_64M, .flag = PMB_SZ_64M, }, | |
62 | { .size = SZ_16M, .flag = PMB_SZ_16M, }, | |
63 | }; | |
64 | ||
d01447b3 | 65 | static void pmb_unmap_entry(struct pmb_entry *, int depth); |
fc2bdefd | 66 | |
d53a0d33 | 67 | static DEFINE_RWLOCK(pmb_rwlock); |
edd7de80 | 68 | static struct pmb_entry pmb_entry_list[NR_PMB_ENTRIES]; |
51becfd9 | 69 | static DECLARE_BITMAP(pmb_map, NR_PMB_ENTRIES); |
0c7b1df6 | 70 | |
4cfa8e75 PM |
71 | static unsigned int pmb_iomapping_enabled; |
72 | ||
51becfd9 | 73 | static __always_inline unsigned long mk_pmb_entry(unsigned int entry) |
0c7b1df6 PM |
74 | { |
75 | return (entry & PMB_E_MASK) << PMB_E_SHIFT; | |
76 | } | |
77 | ||
51becfd9 | 78 | static __always_inline unsigned long mk_pmb_addr(unsigned int entry) |
0c7b1df6 PM |
79 | { |
80 | return mk_pmb_entry(entry) | PMB_ADDR; | |
81 | } | |
82 | ||
51becfd9 | 83 | static __always_inline unsigned long mk_pmb_data(unsigned int entry) |
0c7b1df6 PM |
84 | { |
85 | return mk_pmb_entry(entry) | PMB_DATA; | |
86 | } | |
87 | ||
90e7d649 PM |
88 | static __always_inline unsigned int pmb_ppn_in_range(unsigned long ppn) |
89 | { | |
90 | return ppn >= __pa(memory_start) && ppn < __pa(memory_end); | |
91 | } | |
92 | ||
93 | /* | |
94 | * Ensure that the PMB entries match our cache configuration. | |
95 | * | |
96 | * When we are in 32-bit address extended mode, CCR.CB becomes | |
97 | * invalid, so care must be taken to manually adjust cacheable | |
98 | * translations. | |
99 | */ | |
100 | static __always_inline unsigned long pmb_cache_flags(void) | |
101 | { | |
102 | unsigned long flags = 0; | |
103 | ||
104 | #if defined(CONFIG_CACHE_OFF) | |
105 | flags |= PMB_WT | PMB_UB; | |
106 | #elif defined(CONFIG_CACHE_WRITETHROUGH) | |
107 | flags |= PMB_C | PMB_WT | PMB_UB; | |
108 | #elif defined(CONFIG_CACHE_WRITEBACK) | |
109 | flags |= PMB_C; | |
110 | #endif | |
111 | ||
112 | return flags; | |
113 | } | |
114 | ||
115 | /* | |
116 | * Convert typical pgprot value to the PMB equivalent | |
117 | */ | |
118 | static inline unsigned long pgprot_to_pmb_flags(pgprot_t prot) | |
119 | { | |
120 | unsigned long pmb_flags = 0; | |
121 | u64 flags = pgprot_val(prot); | |
122 | ||
123 | if (flags & _PAGE_CACHABLE) | |
124 | pmb_flags |= PMB_C; | |
125 | if (flags & _PAGE_WT) | |
126 | pmb_flags |= PMB_WT | PMB_UB; | |
127 | ||
128 | return pmb_flags; | |
129 | } | |
130 | ||
a1042aa2 | 131 | static inline bool pmb_can_merge(struct pmb_entry *a, struct pmb_entry *b) |
90e7d649 PM |
132 | { |
133 | return (b->vpn == (a->vpn + a->size)) && | |
134 | (b->ppn == (a->ppn + a->size)) && | |
135 | (b->flags == a->flags); | |
136 | } | |
137 | ||
a1042aa2 PM |
138 | static bool pmb_mapping_exists(unsigned long vaddr, phys_addr_t phys, |
139 | unsigned long size) | |
140 | { | |
141 | int i; | |
142 | ||
143 | read_lock(&pmb_rwlock); | |
144 | ||
145 | for (i = 0; i < ARRAY_SIZE(pmb_entry_list); i++) { | |
146 | struct pmb_entry *pmbe, *iter; | |
147 | unsigned long span; | |
148 | ||
149 | if (!test_bit(i, pmb_map)) | |
150 | continue; | |
151 | ||
152 | pmbe = &pmb_entry_list[i]; | |
153 | ||
154 | /* | |
155 | * See if VPN and PPN are bounded by an existing mapping. | |
156 | */ | |
157 | if ((vaddr < pmbe->vpn) || (vaddr >= (pmbe->vpn + pmbe->size))) | |
158 | continue; | |
159 | if ((phys < pmbe->ppn) || (phys >= (pmbe->ppn + pmbe->size))) | |
160 | continue; | |
161 | ||
162 | /* | |
163 | * Now see if we're in range of a simple mapping. | |
164 | */ | |
165 | if (size <= pmbe->size) { | |
166 | read_unlock(&pmb_rwlock); | |
167 | return true; | |
168 | } | |
169 | ||
170 | span = pmbe->size; | |
171 | ||
172 | /* | |
173 | * Finally for sizes that involve compound mappings, walk | |
174 | * the chain. | |
175 | */ | |
176 | for (iter = pmbe->link; iter; iter = iter->link) | |
177 | span += iter->size; | |
178 | ||
179 | /* | |
180 | * Nothing else to do if the range requirements are met. | |
181 | */ | |
182 | if (size <= span) { | |
183 | read_unlock(&pmb_rwlock); | |
184 | return true; | |
185 | } | |
186 | } | |
187 | ||
188 | read_unlock(&pmb_rwlock); | |
189 | return false; | |
190 | } | |
191 | ||
90e7d649 PM |
192 | static bool pmb_size_valid(unsigned long size) |
193 | { | |
194 | int i; | |
195 | ||
196 | for (i = 0; i < ARRAY_SIZE(pmb_sizes); i++) | |
197 | if (pmb_sizes[i].size == size) | |
198 | return true; | |
199 | ||
200 | return false; | |
201 | } | |
202 | ||
203 | static inline bool pmb_addr_valid(unsigned long addr, unsigned long size) | |
204 | { | |
205 | return (addr >= P1SEG && (addr + size - 1) < P3SEG); | |
206 | } | |
207 | ||
208 | static inline bool pmb_prot_valid(pgprot_t prot) | |
209 | { | |
210 | return (pgprot_val(prot) & _PAGE_USER) == 0; | |
211 | } | |
212 | ||
213 | static int pmb_size_to_flags(unsigned long size) | |
214 | { | |
215 | int i; | |
216 | ||
217 | for (i = 0; i < ARRAY_SIZE(pmb_sizes); i++) | |
218 | if (pmb_sizes[i].size == size) | |
219 | return pmb_sizes[i].flag; | |
220 | ||
221 | return 0; | |
222 | } | |
223 | ||
067784f6 MF |
224 | static int pmb_alloc_entry(void) |
225 | { | |
d53a0d33 | 226 | int pos; |
067784f6 | 227 | |
51becfd9 | 228 | pos = find_first_zero_bit(pmb_map, NR_PMB_ENTRIES); |
d53a0d33 PM |
229 | if (pos >= 0 && pos < NR_PMB_ENTRIES) |
230 | __set_bit(pos, pmb_map); | |
231 | else | |
232 | pos = -ENOSPC; | |
067784f6 MF |
233 | |
234 | return pos; | |
235 | } | |
236 | ||
8386aebb | 237 | static struct pmb_entry *pmb_alloc(unsigned long vpn, unsigned long ppn, |
20b5014b | 238 | unsigned long flags, int entry) |
0c7b1df6 PM |
239 | { |
240 | struct pmb_entry *pmbe; | |
d53a0d33 PM |
241 | unsigned long irqflags; |
242 | void *ret = NULL; | |
067784f6 MF |
243 | int pos; |
244 | ||
d53a0d33 PM |
245 | write_lock_irqsave(&pmb_rwlock, irqflags); |
246 | ||
20b5014b MF |
247 | if (entry == PMB_NO_ENTRY) { |
248 | pos = pmb_alloc_entry(); | |
d53a0d33 PM |
249 | if (unlikely(pos < 0)) { |
250 | ret = ERR_PTR(pos); | |
251 | goto out; | |
252 | } | |
20b5014b | 253 | } else { |
d53a0d33 PM |
254 | if (__test_and_set_bit(entry, pmb_map)) { |
255 | ret = ERR_PTR(-ENOSPC); | |
256 | goto out; | |
257 | } | |
258 | ||
20b5014b MF |
259 | pos = entry; |
260 | } | |
0c7b1df6 | 261 | |
d53a0d33 PM |
262 | write_unlock_irqrestore(&pmb_rwlock, irqflags); |
263 | ||
edd7de80 | 264 | pmbe = &pmb_entry_list[pos]; |
d53a0d33 | 265 | |
d01447b3 PM |
266 | memset(pmbe, 0, sizeof(struct pmb_entry)); |
267 | ||
d53a0d33 | 268 | spin_lock_init(&pmbe->lock); |
0c7b1df6 PM |
269 | |
270 | pmbe->vpn = vpn; | |
271 | pmbe->ppn = ppn; | |
272 | pmbe->flags = flags; | |
067784f6 | 273 | pmbe->entry = pos; |
0c7b1df6 PM |
274 | |
275 | return pmbe; | |
d53a0d33 PM |
276 | |
277 | out: | |
278 | write_unlock_irqrestore(&pmb_rwlock, irqflags); | |
279 | return ret; | |
0c7b1df6 PM |
280 | } |
281 | ||
8386aebb | 282 | static void pmb_free(struct pmb_entry *pmbe) |
0c7b1df6 | 283 | { |
d53a0d33 | 284 | __clear_bit(pmbe->entry, pmb_map); |
d01447b3 PM |
285 | |
286 | pmbe->entry = PMB_NO_ENTRY; | |
287 | pmbe->link = NULL; | |
0c7b1df6 PM |
288 | } |
289 | ||
290 | /* | |
51becfd9 | 291 | * Must be run uncached. |
0c7b1df6 | 292 | */ |
d53a0d33 | 293 | static void __set_pmb_entry(struct pmb_entry *pmbe) |
0c7b1df6 | 294 | { |
90e7d649 PM |
295 | /* Set V-bit */ |
296 | __raw_writel(pmbe->ppn | pmbe->flags | PMB_V, mk_pmb_data(pmbe->entry)); | |
297 | __raw_writel(pmbe->vpn | PMB_V, mk_pmb_addr(pmbe->entry)); | |
0c7b1df6 PM |
298 | } |
299 | ||
d53a0d33 | 300 | static void __clear_pmb_entry(struct pmb_entry *pmbe) |
0c7b1df6 | 301 | { |
2e450643 PM |
302 | unsigned long addr, data; |
303 | unsigned long addr_val, data_val; | |
0c7b1df6 | 304 | |
2e450643 PM |
305 | addr = mk_pmb_addr(pmbe->entry); |
306 | data = mk_pmb_data(pmbe->entry); | |
0c7b1df6 | 307 | |
2e450643 PM |
308 | addr_val = __raw_readl(addr); |
309 | data_val = __raw_readl(data); | |
0c7b1df6 | 310 | |
2e450643 PM |
311 | /* Clear V-bit */ |
312 | writel_uncached(addr_val & ~PMB_V, addr); | |
313 | writel_uncached(data_val & ~PMB_V, data); | |
0c7b1df6 PM |
314 | } |
315 | ||
d53a0d33 PM |
316 | static void set_pmb_entry(struct pmb_entry *pmbe) |
317 | { | |
318 | unsigned long flags; | |
319 | ||
320 | spin_lock_irqsave(&pmbe->lock, flags); | |
321 | __set_pmb_entry(pmbe); | |
322 | spin_unlock_irqrestore(&pmbe->lock, flags); | |
323 | } | |
324 | ||
90e7d649 PM |
325 | int pmb_bolt_mapping(unsigned long vaddr, phys_addr_t phys, |
326 | unsigned long size, pgprot_t prot) | |
d7cdc9e8 | 327 | { |
fc2bdefd | 328 | struct pmb_entry *pmbp, *pmbe; |
a1042aa2 | 329 | unsigned long flags, pmb_flags; |
90e7d649 | 330 | int i, mapped; |
90e7d649 | 331 | |
6eb3c735 PM |
332 | if (!pmb_addr_valid(vaddr, size)) |
333 | return -EFAULT; | |
a1042aa2 PM |
334 | if (pmb_mapping_exists(vaddr, phys, size)) |
335 | return 0; | |
7bdda620 | 336 | |
90e7d649 | 337 | pmb_flags = pgprot_to_pmb_flags(prot); |
6eb3c735 | 338 | pmbp = NULL; |
d7cdc9e8 | 339 | |
a1042aa2 PM |
340 | do { |
341 | for (i = mapped = 0; i < ARRAY_SIZE(pmb_sizes); i++) { | |
342 | if (size < pmb_sizes[i].size) | |
343 | continue; | |
d7cdc9e8 | 344 | |
a1042aa2 PM |
345 | pmbe = pmb_alloc(vaddr, phys, pmb_flags | |
346 | pmb_sizes[i].flag, PMB_NO_ENTRY); | |
347 | if (IS_ERR(pmbe)) { | |
348 | pmb_unmap_entry(pmbp, mapped); | |
349 | return PTR_ERR(pmbe); | |
350 | } | |
d53a0d33 | 351 | |
a1042aa2 | 352 | spin_lock_irqsave(&pmbe->lock, flags); |
d7cdc9e8 | 353 | |
a1042aa2 | 354 | pmbe->size = pmb_sizes[i].size; |
d7cdc9e8 | 355 | |
a1042aa2 | 356 | __set_pmb_entry(pmbe); |
d7813bc9 | 357 | |
a1042aa2 PM |
358 | phys += pmbe->size; |
359 | vaddr += pmbe->size; | |
360 | size -= pmbe->size; | |
d7cdc9e8 | 361 | |
a1042aa2 PM |
362 | /* |
363 | * Link adjacent entries that span multiple PMB | |
364 | * entries for easier tear-down. | |
365 | */ | |
366 | if (likely(pmbp)) { | |
367 | spin_lock(&pmbp->lock); | |
368 | pmbp->link = pmbe; | |
369 | spin_unlock(&pmbp->lock); | |
370 | } | |
a2767cfb | 371 | |
a1042aa2 | 372 | pmbp = pmbe; |
d53a0d33 | 373 | |
a1042aa2 PM |
374 | /* |
375 | * Instead of trying smaller sizes on every | |
376 | * iteration (even if we succeed in allocating | |
377 | * space), try using pmb_sizes[i].size again. | |
378 | */ | |
379 | i--; | |
380 | mapped++; | |
d7cdc9e8 | 381 | |
a1042aa2 PM |
382 | spin_unlock_irqrestore(&pmbe->lock, flags); |
383 | } | |
384 | } while (size >= SZ_16M); | |
d7cdc9e8 | 385 | |
6eb3c735 PM |
386 | return 0; |
387 | } | |
388 | ||
389 | void __iomem *pmb_remap_caller(phys_addr_t phys, unsigned long size, | |
390 | pgprot_t prot, void *caller) | |
391 | { | |
392 | unsigned long orig_addr, vaddr; | |
393 | phys_addr_t offset, last_addr; | |
394 | phys_addr_t align_mask; | |
395 | unsigned long aligned; | |
396 | struct vm_struct *area; | |
397 | int i, ret; | |
398 | ||
399 | if (!pmb_iomapping_enabled) | |
400 | return NULL; | |
401 | ||
402 | /* | |
403 | * Small mappings need to go through the TLB. | |
404 | */ | |
405 | if (size < SZ_16M) | |
406 | return ERR_PTR(-EINVAL); | |
407 | if (!pmb_prot_valid(prot)) | |
408 | return ERR_PTR(-EINVAL); | |
409 | ||
410 | for (i = 0; i < ARRAY_SIZE(pmb_sizes); i++) | |
411 | if (size >= pmb_sizes[i].size) | |
412 | break; | |
413 | ||
414 | last_addr = phys + size; | |
415 | align_mask = ~(pmb_sizes[i].size - 1); | |
416 | offset = phys & ~align_mask; | |
417 | phys &= align_mask; | |
418 | aligned = ALIGN(last_addr, pmb_sizes[i].size) - phys; | |
419 | ||
420 | area = __get_vm_area_caller(aligned, VM_IOREMAP, uncached_end, | |
421 | P3SEG, caller); | |
422 | if (!area) | |
423 | return NULL; | |
424 | ||
425 | area->phys_addr = phys; | |
426 | orig_addr = vaddr = (unsigned long)area->addr; | |
427 | ||
428 | ret = pmb_bolt_mapping(vaddr, phys, size, prot); | |
a1042aa2 | 429 | if (unlikely(ret != 0)) |
6eb3c735 PM |
430 | return ERR_PTR(ret); |
431 | ||
90e7d649 | 432 | return (void __iomem *)(offset + (char *)orig_addr); |
d7cdc9e8 PM |
433 | } |
434 | ||
90e7d649 | 435 | int pmb_unmap(void __iomem *addr) |
d7cdc9e8 | 436 | { |
d53a0d33 | 437 | struct pmb_entry *pmbe = NULL; |
90e7d649 PM |
438 | unsigned long vaddr = (unsigned long __force)addr; |
439 | int i, found = 0; | |
d7cdc9e8 | 440 | |
d53a0d33 PM |
441 | read_lock(&pmb_rwlock); |
442 | ||
edd7de80 | 443 | for (i = 0; i < ARRAY_SIZE(pmb_entry_list); i++) { |
51becfd9 | 444 | if (test_bit(i, pmb_map)) { |
edd7de80 | 445 | pmbe = &pmb_entry_list[i]; |
90e7d649 PM |
446 | if (pmbe->vpn == vaddr) { |
447 | found = 1; | |
edd7de80 | 448 | break; |
90e7d649 | 449 | } |
edd7de80 MF |
450 | } |
451 | } | |
d53a0d33 PM |
452 | |
453 | read_unlock(&pmb_rwlock); | |
454 | ||
90e7d649 PM |
455 | if (found) { |
456 | pmb_unmap_entry(pmbe, NR_PMB_ENTRIES); | |
457 | return 0; | |
458 | } | |
d7cdc9e8 | 459 | |
90e7d649 | 460 | return -EINVAL; |
d01447b3 PM |
461 | } |
462 | ||
463 | static void __pmb_unmap_entry(struct pmb_entry *pmbe, int depth) | |
464 | { | |
d7cdc9e8 PM |
465 | do { |
466 | struct pmb_entry *pmblink = pmbe; | |
467 | ||
067784f6 MF |
468 | /* |
469 | * We may be called before this pmb_entry has been | |
470 | * entered into the PMB table via set_pmb_entry(), but | |
471 | * that's OK because we've allocated a unique slot for | |
472 | * this entry in pmb_alloc() (even if we haven't filled | |
473 | * it yet). | |
474 | * | |
d53a0d33 | 475 | * Therefore, calling __clear_pmb_entry() is safe as no |
067784f6 MF |
476 | * other mapping can be using that slot. |
477 | */ | |
d53a0d33 | 478 | __clear_pmb_entry(pmbe); |
fc2bdefd | 479 | |
d7cdc9e8 PM |
480 | pmbe = pmblink->link; |
481 | ||
482 | pmb_free(pmblink); | |
d01447b3 PM |
483 | } while (pmbe && --depth); |
484 | } | |
485 | ||
486 | static void pmb_unmap_entry(struct pmb_entry *pmbe, int depth) | |
487 | { | |
488 | unsigned long flags; | |
d53a0d33 | 489 | |
d01447b3 PM |
490 | if (unlikely(!pmbe)) |
491 | return; | |
492 | ||
493 | write_lock_irqsave(&pmb_rwlock, flags); | |
494 | __pmb_unmap_entry(pmbe, depth); | |
d53a0d33 | 495 | write_unlock_irqrestore(&pmb_rwlock, flags); |
d7cdc9e8 PM |
496 | } |
497 | ||
d01447b3 | 498 | static void __init pmb_notify(void) |
20b5014b | 499 | { |
d01447b3 | 500 | int i; |
20b5014b | 501 | |
efd54ea3 | 502 | pr_info("PMB: boot mappings:\n"); |
20b5014b | 503 | |
d01447b3 PM |
504 | read_lock(&pmb_rwlock); |
505 | ||
506 | for (i = 0; i < ARRAY_SIZE(pmb_entry_list); i++) { | |
507 | struct pmb_entry *pmbe; | |
508 | ||
509 | if (!test_bit(i, pmb_map)) | |
510 | continue; | |
511 | ||
512 | pmbe = &pmb_entry_list[i]; | |
513 | ||
514 | pr_info(" 0x%08lx -> 0x%08lx [ %4ldMB %2scached ]\n", | |
515 | pmbe->vpn >> PAGE_SHIFT, pmbe->ppn >> PAGE_SHIFT, | |
516 | pmbe->size >> 20, (pmbe->flags & PMB_C) ? "" : "un"); | |
517 | } | |
518 | ||
519 | read_unlock(&pmb_rwlock); | |
520 | } | |
521 | ||
522 | /* | |
523 | * Sync our software copy of the PMB mappings with those in hardware. The | |
524 | * mappings in the hardware PMB were either set up by the bootloader or | |
525 | * very early on by the kernel. | |
526 | */ | |
527 | static void __init pmb_synchronize(void) | |
528 | { | |
529 | struct pmb_entry *pmbp = NULL; | |
530 | int i, j; | |
531 | ||
3d467676 | 532 | /* |
efd54ea3 PM |
533 | * Run through the initial boot mappings, log the established |
534 | * ones, and blow away anything that falls outside of the valid | |
535 | * PPN range. Specifically, we only care about existing mappings | |
536 | * that impact the cached/uncached sections. | |
3d467676 | 537 | * |
efd54ea3 PM |
538 | * Note that touching these can be a bit of a minefield; the boot |
539 | * loader can establish multi-page mappings with the same caching | |
540 | * attributes, so we need to ensure that we aren't modifying a | |
541 | * mapping that we're presently executing from, or may execute | |
542 | * from in the case of straddling page boundaries. | |
3d467676 | 543 | * |
efd54ea3 PM |
544 | * In the future we will have to tidy up after the boot loader by |
545 | * jumping between the cached and uncached mappings and tearing | |
546 | * down alternating mappings while executing from the other. | |
3d467676 | 547 | */ |
51becfd9 | 548 | for (i = 0; i < NR_PMB_ENTRIES; i++) { |
3d467676 MF |
549 | unsigned long addr, data; |
550 | unsigned long addr_val, data_val; | |
efd54ea3 | 551 | unsigned long ppn, vpn, flags; |
d53a0d33 | 552 | unsigned long irqflags; |
d7813bc9 | 553 | unsigned int size; |
efd54ea3 | 554 | struct pmb_entry *pmbe; |
20b5014b | 555 | |
3d467676 MF |
556 | addr = mk_pmb_addr(i); |
557 | data = mk_pmb_data(i); | |
20b5014b | 558 | |
3d467676 MF |
559 | addr_val = __raw_readl(addr); |
560 | data_val = __raw_readl(data); | |
20b5014b | 561 | |
3d467676 MF |
562 | /* |
563 | * Skip over any bogus entries | |
564 | */ | |
565 | if (!(data_val & PMB_V) || !(addr_val & PMB_V)) | |
566 | continue; | |
20b5014b | 567 | |
3d467676 MF |
568 | ppn = data_val & PMB_PFN_MASK; |
569 | vpn = addr_val & PMB_PFN_MASK; | |
a0ab3668 | 570 | |
3d467676 MF |
571 | /* |
572 | * Only preserve in-range mappings. | |
573 | */ | |
efd54ea3 | 574 | if (!pmb_ppn_in_range(ppn)) { |
3d467676 MF |
575 | /* |
576 | * Invalidate anything out of bounds. | |
577 | */ | |
2e450643 PM |
578 | writel_uncached(addr_val & ~PMB_V, addr); |
579 | writel_uncached(data_val & ~PMB_V, data); | |
efd54ea3 | 580 | continue; |
3d467676 | 581 | } |
efd54ea3 PM |
582 | |
583 | /* | |
584 | * Update the caching attributes if necessary | |
585 | */ | |
586 | if (data_val & PMB_C) { | |
0065b967 PM |
587 | data_val &= ~PMB_CACHE_MASK; |
588 | data_val |= pmb_cache_flags(); | |
2e450643 PM |
589 | |
590 | writel_uncached(data_val, data); | |
efd54ea3 PM |
591 | } |
592 | ||
d7813bc9 PM |
593 | size = data_val & PMB_SZ_MASK; |
594 | flags = size | (data_val & PMB_CACHE_MASK); | |
efd54ea3 PM |
595 | |
596 | pmbe = pmb_alloc(vpn, ppn, flags, i); | |
597 | if (IS_ERR(pmbe)) { | |
598 | WARN_ON_ONCE(1); | |
599 | continue; | |
600 | } | |
601 | ||
d53a0d33 PM |
602 | spin_lock_irqsave(&pmbe->lock, irqflags); |
603 | ||
d7813bc9 PM |
604 | for (j = 0; j < ARRAY_SIZE(pmb_sizes); j++) |
605 | if (pmb_sizes[j].flag == size) | |
606 | pmbe->size = pmb_sizes[j].size; | |
607 | ||
d53a0d33 PM |
608 | if (pmbp) { |
609 | spin_lock(&pmbp->lock); | |
610 | ||
611 | /* | |
612 | * Compare the previous entry against the current one to | |
613 | * see if the entries span a contiguous mapping. If so, | |
d01447b3 PM |
614 | * setup the entry links accordingly. Compound mappings |
615 | * are later coalesced. | |
d53a0d33 | 616 | */ |
d01447b3 | 617 | if (pmb_can_merge(pmbp, pmbe)) |
d53a0d33 PM |
618 | pmbp->link = pmbe; |
619 | ||
620 | spin_unlock(&pmbp->lock); | |
621 | } | |
d7813bc9 PM |
622 | |
623 | pmbp = pmbe; | |
624 | ||
d53a0d33 | 625 | spin_unlock_irqrestore(&pmbe->lock, irqflags); |
d01447b3 PM |
626 | } |
627 | } | |
d53a0d33 | 628 | |
d01447b3 PM |
629 | static void __init pmb_merge(struct pmb_entry *head) |
630 | { | |
631 | unsigned long span, newsize; | |
632 | struct pmb_entry *tail; | |
633 | int i = 1, depth = 0; | |
634 | ||
635 | span = newsize = head->size; | |
efd54ea3 | 636 | |
d01447b3 PM |
637 | tail = head->link; |
638 | while (tail) { | |
639 | span += tail->size; | |
640 | ||
641 | if (pmb_size_valid(span)) { | |
642 | newsize = span; | |
643 | depth = i; | |
644 | } | |
645 | ||
646 | /* This is the end of the line.. */ | |
647 | if (!tail->link) | |
648 | break; | |
649 | ||
650 | tail = tail->link; | |
651 | i++; | |
a0ab3668 PM |
652 | } |
653 | ||
d01447b3 PM |
654 | /* |
655 | * The merged page size must be valid. | |
656 | */ | |
657 | if (!pmb_size_valid(newsize)) | |
658 | return; | |
659 | ||
660 | head->flags &= ~PMB_SZ_MASK; | |
661 | head->flags |= pmb_size_to_flags(newsize); | |
662 | ||
663 | head->size = newsize; | |
664 | ||
665 | __pmb_unmap_entry(head->link, depth); | |
666 | __set_pmb_entry(head); | |
a0ab3668 | 667 | } |
a0ab3668 | 668 | |
d01447b3 | 669 | static void __init pmb_coalesce(void) |
a0ab3668 | 670 | { |
d01447b3 PM |
671 | unsigned long flags; |
672 | int i; | |
673 | ||
674 | write_lock_irqsave(&pmb_rwlock, flags); | |
675 | ||
676 | for (i = 0; i < ARRAY_SIZE(pmb_entry_list); i++) { | |
677 | struct pmb_entry *pmbe; | |
678 | ||
679 | if (!test_bit(i, pmb_map)) | |
680 | continue; | |
681 | ||
682 | pmbe = &pmb_entry_list[i]; | |
683 | ||
684 | /* | |
685 | * We're only interested in compound mappings | |
686 | */ | |
687 | if (!pmbe->link) | |
688 | continue; | |
689 | ||
690 | /* | |
691 | * Nothing to do if it already uses the largest possible | |
692 | * page size. | |
693 | */ | |
694 | if (pmbe->size == SZ_512M) | |
695 | continue; | |
696 | ||
697 | pmb_merge(pmbe); | |
698 | } | |
699 | ||
700 | write_unlock_irqrestore(&pmb_rwlock, flags); | |
701 | } | |
702 | ||
703 | #ifdef CONFIG_UNCACHED_MAPPING | |
704 | static void __init pmb_resize(void) | |
705 | { | |
706 | int i; | |
a0ab3668 | 707 | |
a0ab3668 | 708 | /* |
d01447b3 PM |
709 | * If the uncached mapping was constructed by the kernel, it will |
710 | * already be a reasonable size. | |
a0ab3668 | 711 | */ |
d01447b3 PM |
712 | if (uncached_size == SZ_16M) |
713 | return; | |
714 | ||
715 | read_lock(&pmb_rwlock); | |
716 | ||
717 | for (i = 0; i < ARRAY_SIZE(pmb_entry_list); i++) { | |
718 | struct pmb_entry *pmbe; | |
719 | unsigned long flags; | |
720 | ||
721 | if (!test_bit(i, pmb_map)) | |
722 | continue; | |
723 | ||
724 | pmbe = &pmb_entry_list[i]; | |
725 | ||
726 | if (pmbe->vpn != uncached_start) | |
727 | continue; | |
728 | ||
729 | /* | |
730 | * Found it, now resize it. | |
731 | */ | |
732 | spin_lock_irqsave(&pmbe->lock, flags); | |
733 | ||
734 | pmbe->size = SZ_16M; | |
735 | pmbe->flags &= ~PMB_SZ_MASK; | |
736 | pmbe->flags |= pmb_size_to_flags(pmbe->size); | |
737 | ||
738 | uncached_resize(pmbe->size); | |
739 | ||
740 | __set_pmb_entry(pmbe); | |
741 | ||
742 | spin_unlock_irqrestore(&pmbe->lock, flags); | |
743 | } | |
744 | ||
745 | read_lock(&pmb_rwlock); | |
746 | } | |
747 | #endif | |
748 | ||
4cfa8e75 PM |
749 | static int __init early_pmb(char *p) |
750 | { | |
751 | if (!p) | |
752 | return 0; | |
753 | ||
754 | if (strstr(p, "iomap")) | |
755 | pmb_iomapping_enabled = 1; | |
756 | ||
757 | return 0; | |
758 | } | |
759 | early_param("pmb", early_pmb); | |
760 | ||
d01447b3 PM |
761 | void __init pmb_init(void) |
762 | { | |
763 | /* Synchronize software state */ | |
764 | pmb_synchronize(); | |
765 | ||
766 | /* Attempt to combine compound mappings */ | |
767 | pmb_coalesce(); | |
768 | ||
769 | #ifdef CONFIG_UNCACHED_MAPPING | |
770 | /* Resize initial mappings, if necessary */ | |
771 | pmb_resize(); | |
772 | #endif | |
773 | ||
774 | /* Log them */ | |
775 | pmb_notify(); | |
3d467676 | 776 | |
2e450643 | 777 | writel_uncached(0, PMB_IRMCR); |
a0ab3668 PM |
778 | |
779 | /* Flush out the TLB */ | |
efd54ea3 | 780 | __raw_writel(__raw_readl(MMUCR) | MMUCR_TI, MMUCR); |
2e450643 | 781 | ctrl_barrier(); |
20b5014b | 782 | } |
0c7b1df6 | 783 | |
2efa53b2 PM |
784 | bool __in_29bit_mode(void) |
785 | { | |
786 | return (__raw_readl(PMB_PASCR) & PASCR_SE) == 0; | |
787 | } | |
788 | ||
0c7b1df6 PM |
789 | static int pmb_seq_show(struct seq_file *file, void *iter) |
790 | { | |
791 | int i; | |
792 | ||
793 | seq_printf(file, "V: Valid, C: Cacheable, WT: Write-Through\n" | |
794 | "CB: Copy-Back, B: Buffered, UB: Unbuffered\n"); | |
795 | seq_printf(file, "ety vpn ppn size flags\n"); | |
796 | ||
797 | for (i = 0; i < NR_PMB_ENTRIES; i++) { | |
798 | unsigned long addr, data; | |
799 | unsigned int size; | |
800 | char *sz_str = NULL; | |
801 | ||
9d56dd3b PM |
802 | addr = __raw_readl(mk_pmb_addr(i)); |
803 | data = __raw_readl(mk_pmb_data(i)); | |
0c7b1df6 PM |
804 | |
805 | size = data & PMB_SZ_MASK; | |
806 | sz_str = (size == PMB_SZ_16M) ? " 16MB": | |
807 | (size == PMB_SZ_64M) ? " 64MB": | |
808 | (size == PMB_SZ_128M) ? "128MB": | |
809 | "512MB"; | |
810 | ||
811 | /* 02: V 0x88 0x08 128MB C CB B */ | |
812 | seq_printf(file, "%02d: %c 0x%02lx 0x%02lx %s %c %s %s\n", | |
813 | i, ((addr & PMB_V) && (data & PMB_V)) ? 'V' : ' ', | |
814 | (addr >> 24) & 0xff, (data >> 24) & 0xff, | |
815 | sz_str, (data & PMB_C) ? 'C' : ' ', | |
816 | (data & PMB_WT) ? "WT" : "CB", | |
817 | (data & PMB_UB) ? "UB" : " B"); | |
818 | } | |
819 | ||
820 | return 0; | |
821 | } | |
822 | ||
823 | static int pmb_debugfs_open(struct inode *inode, struct file *file) | |
824 | { | |
825 | return single_open(file, pmb_seq_show, NULL); | |
826 | } | |
827 | ||
5dfe4c96 | 828 | static const struct file_operations pmb_debugfs_fops = { |
0c7b1df6 PM |
829 | .owner = THIS_MODULE, |
830 | .open = pmb_debugfs_open, | |
831 | .read = seq_read, | |
832 | .llseek = seq_lseek, | |
45dabf14 | 833 | .release = single_release, |
0c7b1df6 PM |
834 | }; |
835 | ||
836 | static int __init pmb_debugfs_init(void) | |
837 | { | |
838 | struct dentry *dentry; | |
839 | ||
840 | dentry = debugfs_create_file("pmb", S_IFREG | S_IRUGO, | |
b9e393c2 | 841 | sh_debugfs_root, NULL, &pmb_debugfs_fops); |
25627c7f Z |
842 | if (!dentry) |
843 | return -ENOMEM; | |
0c7b1df6 PM |
844 | if (IS_ERR(dentry)) |
845 | return PTR_ERR(dentry); | |
846 | ||
847 | return 0; | |
848 | } | |
0c7b1df6 | 849 | postcore_initcall(pmb_debugfs_init); |
a83c0b73 FV |
850 | |
851 | #ifdef CONFIG_PM | |
852 | static int pmb_sysdev_suspend(struct sys_device *dev, pm_message_t state) | |
853 | { | |
854 | static pm_message_t prev_state; | |
edd7de80 | 855 | int i; |
a83c0b73 FV |
856 | |
857 | /* Restore the PMB after a resume from hibernation */ | |
858 | if (state.event == PM_EVENT_ON && | |
859 | prev_state.event == PM_EVENT_FREEZE) { | |
860 | struct pmb_entry *pmbe; | |
d53a0d33 PM |
861 | |
862 | read_lock(&pmb_rwlock); | |
863 | ||
edd7de80 | 864 | for (i = 0; i < ARRAY_SIZE(pmb_entry_list); i++) { |
51becfd9 | 865 | if (test_bit(i, pmb_map)) { |
edd7de80 MF |
866 | pmbe = &pmb_entry_list[i]; |
867 | set_pmb_entry(pmbe); | |
868 | } | |
869 | } | |
d53a0d33 PM |
870 | |
871 | read_unlock(&pmb_rwlock); | |
a83c0b73 | 872 | } |
d53a0d33 | 873 | |
a83c0b73 | 874 | prev_state = state; |
d53a0d33 | 875 | |
a83c0b73 FV |
876 | return 0; |
877 | } | |
878 | ||
879 | static int pmb_sysdev_resume(struct sys_device *dev) | |
880 | { | |
881 | return pmb_sysdev_suspend(dev, PMSG_ON); | |
882 | } | |
883 | ||
884 | static struct sysdev_driver pmb_sysdev_driver = { | |
885 | .suspend = pmb_sysdev_suspend, | |
886 | .resume = pmb_sysdev_resume, | |
887 | }; | |
888 | ||
889 | static int __init pmb_sysdev_init(void) | |
890 | { | |
891 | return sysdev_driver_register(&cpu_sysdev_class, &pmb_sysdev_driver); | |
892 | } | |
a83c0b73 FV |
893 | subsys_initcall(pmb_sysdev_init); |
894 | #endif |