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