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> | |
24 | #include <asm/system.h> | |
25 | #include <asm/uaccess.h> | |
d7cdc9e8 | 26 | #include <asm/pgtable.h> |
0c7b1df6 PM |
27 | #include <asm/mmu.h> |
28 | #include <asm/io.h> | |
eddeeb32 | 29 | #include <asm/mmu_context.h> |
0c7b1df6 PM |
30 | |
31 | #define NR_PMB_ENTRIES 16 | |
32 | ||
fc2bdefd MF |
33 | static void __pmb_unmap(struct pmb_entry *); |
34 | ||
edd7de80 | 35 | static struct pmb_entry pmb_entry_list[NR_PMB_ENTRIES]; |
0c7b1df6 PM |
36 | static unsigned long pmb_map; |
37 | ||
0c7b1df6 PM |
38 | static inline unsigned long mk_pmb_entry(unsigned int entry) |
39 | { | |
40 | return (entry & PMB_E_MASK) << PMB_E_SHIFT; | |
41 | } | |
42 | ||
43 | static inline unsigned long mk_pmb_addr(unsigned int entry) | |
44 | { | |
45 | return mk_pmb_entry(entry) | PMB_ADDR; | |
46 | } | |
47 | ||
48 | static inline unsigned long mk_pmb_data(unsigned int entry) | |
49 | { | |
50 | return mk_pmb_entry(entry) | PMB_DATA; | |
51 | } | |
52 | ||
067784f6 MF |
53 | static int pmb_alloc_entry(void) |
54 | { | |
55 | unsigned int pos; | |
56 | ||
57 | repeat: | |
58 | pos = find_first_zero_bit(&pmb_map, NR_PMB_ENTRIES); | |
59 | ||
60 | if (unlikely(pos > NR_PMB_ENTRIES)) | |
61 | return -ENOSPC; | |
62 | ||
63 | if (test_and_set_bit(pos, &pmb_map)) | |
64 | goto repeat; | |
65 | ||
66 | return pos; | |
67 | } | |
68 | ||
8386aebb | 69 | static struct pmb_entry *pmb_alloc(unsigned long vpn, unsigned long ppn, |
20b5014b | 70 | unsigned long flags, int entry) |
0c7b1df6 PM |
71 | { |
72 | struct pmb_entry *pmbe; | |
067784f6 MF |
73 | int pos; |
74 | ||
20b5014b MF |
75 | if (entry == PMB_NO_ENTRY) { |
76 | pos = pmb_alloc_entry(); | |
77 | if (pos < 0) | |
78 | return ERR_PTR(pos); | |
79 | } else { | |
80 | if (test_bit(entry, &pmb_map)) | |
81 | return ERR_PTR(-ENOSPC); | |
82 | pos = entry; | |
83 | } | |
0c7b1df6 | 84 | |
edd7de80 | 85 | pmbe = &pmb_entry_list[pos]; |
0c7b1df6 PM |
86 | if (!pmbe) |
87 | return ERR_PTR(-ENOMEM); | |
88 | ||
89 | pmbe->vpn = vpn; | |
90 | pmbe->ppn = ppn; | |
91 | pmbe->flags = flags; | |
067784f6 | 92 | pmbe->entry = pos; |
0c7b1df6 PM |
93 | |
94 | return pmbe; | |
95 | } | |
96 | ||
8386aebb | 97 | static void pmb_free(struct pmb_entry *pmbe) |
0c7b1df6 | 98 | { |
edd7de80 | 99 | int pos = pmbe->entry; |
38c425f6 | 100 | |
edd7de80 MF |
101 | pmbe->vpn = 0; |
102 | pmbe->ppn = 0; | |
103 | pmbe->flags = 0; | |
104 | pmbe->entry = 0; | |
105 | ||
106 | clear_bit(pos, &pmb_map); | |
0c7b1df6 PM |
107 | } |
108 | ||
109 | /* | |
110 | * Must be in P2 for __set_pmb_entry() | |
111 | */ | |
8386aebb MF |
112 | static void __set_pmb_entry(unsigned long vpn, unsigned long ppn, |
113 | unsigned long flags, int pos) | |
0c7b1df6 | 114 | { |
0c7b1df6 PM |
115 | ctrl_outl(vpn | PMB_V, mk_pmb_addr(pos)); |
116 | ||
e7bd34a1 | 117 | #ifdef CONFIG_CACHE_WRITETHROUGH |
0c7b1df6 PM |
118 | /* |
119 | * When we are in 32-bit address extended mode, CCR.CB becomes | |
120 | * invalid, so care must be taken to manually adjust cacheable | |
121 | * translations. | |
122 | */ | |
123 | if (likely(flags & PMB_C)) | |
124 | flags |= PMB_WT; | |
125 | #endif | |
126 | ||
127 | ctrl_outl(ppn | flags | PMB_V, mk_pmb_data(pos)); | |
0c7b1df6 PM |
128 | } |
129 | ||
8386aebb | 130 | static void __uses_jump_to_uncached set_pmb_entry(struct pmb_entry *pmbe) |
0c7b1df6 | 131 | { |
cbaa118e | 132 | jump_to_uncached(); |
067784f6 | 133 | __set_pmb_entry(pmbe->vpn, pmbe->ppn, pmbe->flags, pmbe->entry); |
cbaa118e | 134 | back_to_cached(); |
0c7b1df6 PM |
135 | } |
136 | ||
8386aebb | 137 | static void __uses_jump_to_uncached clear_pmb_entry(struct pmb_entry *pmbe) |
0c7b1df6 PM |
138 | { |
139 | unsigned int entry = pmbe->entry; | |
140 | unsigned long addr; | |
141 | ||
31051219 | 142 | if (unlikely(entry >= NR_PMB_ENTRIES)) |
0c7b1df6 PM |
143 | return; |
144 | ||
cbaa118e | 145 | jump_to_uncached(); |
0c7b1df6 PM |
146 | |
147 | /* Clear V-bit */ | |
148 | addr = mk_pmb_addr(entry); | |
149 | ctrl_outl(ctrl_inl(addr) & ~PMB_V, addr); | |
150 | ||
151 | addr = mk_pmb_data(entry); | |
152 | ctrl_outl(ctrl_inl(addr) & ~PMB_V, addr); | |
153 | ||
cbaa118e | 154 | back_to_cached(); |
0c7b1df6 PM |
155 | } |
156 | ||
d7cdc9e8 PM |
157 | |
158 | static struct { | |
159 | unsigned long size; | |
160 | int flag; | |
161 | } pmb_sizes[] = { | |
162 | { .size = 0x20000000, .flag = PMB_SZ_512M, }, | |
163 | { .size = 0x08000000, .flag = PMB_SZ_128M, }, | |
164 | { .size = 0x04000000, .flag = PMB_SZ_64M, }, | |
165 | { .size = 0x01000000, .flag = PMB_SZ_16M, }, | |
166 | }; | |
167 | ||
168 | long pmb_remap(unsigned long vaddr, unsigned long phys, | |
169 | unsigned long size, unsigned long flags) | |
170 | { | |
fc2bdefd | 171 | struct pmb_entry *pmbp, *pmbe; |
d7cdc9e8 PM |
172 | unsigned long wanted; |
173 | int pmb_flags, i; | |
fc2bdefd | 174 | long err; |
d7cdc9e8 PM |
175 | |
176 | /* Convert typical pgprot value to the PMB equivalent */ | |
177 | if (flags & _PAGE_CACHABLE) { | |
178 | if (flags & _PAGE_WT) | |
179 | pmb_flags = PMB_WT; | |
180 | else | |
181 | pmb_flags = PMB_C; | |
182 | } else | |
183 | pmb_flags = PMB_WT | PMB_UB; | |
184 | ||
185 | pmbp = NULL; | |
186 | wanted = size; | |
187 | ||
188 | again: | |
189 | for (i = 0; i < ARRAY_SIZE(pmb_sizes); i++) { | |
d7cdc9e8 PM |
190 | if (size < pmb_sizes[i].size) |
191 | continue; | |
192 | ||
20b5014b MF |
193 | pmbe = pmb_alloc(vaddr, phys, pmb_flags | pmb_sizes[i].flag, |
194 | PMB_NO_ENTRY); | |
fc2bdefd MF |
195 | if (IS_ERR(pmbe)) { |
196 | err = PTR_ERR(pmbe); | |
197 | goto out; | |
198 | } | |
d7cdc9e8 | 199 | |
067784f6 | 200 | set_pmb_entry(pmbe); |
d7cdc9e8 PM |
201 | |
202 | phys += pmb_sizes[i].size; | |
203 | vaddr += pmb_sizes[i].size; | |
204 | size -= pmb_sizes[i].size; | |
205 | ||
206 | /* | |
207 | * Link adjacent entries that span multiple PMB entries | |
208 | * for easier tear-down. | |
209 | */ | |
210 | if (likely(pmbp)) | |
211 | pmbp->link = pmbe; | |
212 | ||
213 | pmbp = pmbe; | |
a2767cfb MF |
214 | |
215 | /* | |
216 | * Instead of trying smaller sizes on every iteration | |
217 | * (even if we succeed in allocating space), try using | |
218 | * pmb_sizes[i].size again. | |
219 | */ | |
220 | i--; | |
d7cdc9e8 PM |
221 | } |
222 | ||
223 | if (size >= 0x1000000) | |
224 | goto again; | |
225 | ||
226 | return wanted - size; | |
fc2bdefd MF |
227 | |
228 | out: | |
229 | if (pmbp) | |
230 | __pmb_unmap(pmbp); | |
231 | ||
232 | return err; | |
d7cdc9e8 PM |
233 | } |
234 | ||
235 | void pmb_unmap(unsigned long addr) | |
236 | { | |
edd7de80 MF |
237 | struct pmb_entry *pmbe = NULL; |
238 | int i; | |
d7cdc9e8 | 239 | |
edd7de80 MF |
240 | for (i = 0; i < ARRAY_SIZE(pmb_entry_list); i++) { |
241 | if (test_bit(i, &pmb_map)) { | |
242 | pmbe = &pmb_entry_list[i]; | |
243 | if (pmbe->vpn == addr) | |
244 | break; | |
245 | } | |
246 | } | |
d7cdc9e8 PM |
247 | |
248 | if (unlikely(!pmbe)) | |
249 | return; | |
250 | ||
fc2bdefd MF |
251 | __pmb_unmap(pmbe); |
252 | } | |
253 | ||
254 | static void __pmb_unmap(struct pmb_entry *pmbe) | |
255 | { | |
edd7de80 | 256 | BUG_ON(!test_bit(pmbe->entry, &pmb_map)); |
d7cdc9e8 PM |
257 | |
258 | do { | |
259 | struct pmb_entry *pmblink = pmbe; | |
260 | ||
067784f6 MF |
261 | /* |
262 | * We may be called before this pmb_entry has been | |
263 | * entered into the PMB table via set_pmb_entry(), but | |
264 | * that's OK because we've allocated a unique slot for | |
265 | * this entry in pmb_alloc() (even if we haven't filled | |
266 | * it yet). | |
267 | * | |
268 | * Therefore, calling clear_pmb_entry() is safe as no | |
269 | * other mapping can be using that slot. | |
270 | */ | |
271 | clear_pmb_entry(pmbe); | |
fc2bdefd | 272 | |
d7cdc9e8 PM |
273 | pmbe = pmblink->link; |
274 | ||
275 | pmb_free(pmblink); | |
276 | } while (pmbe); | |
277 | } | |
278 | ||
a0ab3668 | 279 | #ifdef CONFIG_PMB_LEGACY |
3d467676 MF |
280 | static inline unsigned int pmb_ppn_in_range(unsigned long ppn) |
281 | { | |
282 | return ppn >= __MEMORY_START && ppn < __MEMORY_START + __MEMORY_SIZE; | |
283 | } | |
284 | ||
a0ab3668 | 285 | static int pmb_apply_legacy_mappings(void) |
20b5014b | 286 | { |
a0ab3668 | 287 | unsigned int applied = 0; |
3d467676 | 288 | int i; |
20b5014b | 289 | |
3d467676 | 290 | pr_info("PMB: Preserving legacy mappings:\n"); |
20b5014b | 291 | |
3d467676 MF |
292 | /* |
293 | * The following entries are setup by the bootloader. | |
294 | * | |
295 | * Entry VPN PPN V SZ C UB | |
296 | * -------------------------------------------------------- | |
297 | * 0 0xA0000000 0x00000000 1 64MB 0 0 | |
298 | * 1 0xA4000000 0x04000000 1 16MB 0 0 | |
299 | * 2 0xA6000000 0x08000000 1 16MB 0 0 | |
300 | * 9 0x88000000 0x48000000 1 128MB 1 1 | |
301 | * 10 0x90000000 0x50000000 1 128MB 1 1 | |
302 | * 11 0x98000000 0x58000000 1 128MB 1 1 | |
303 | * 13 0xA8000000 0x48000000 1 128MB 0 0 | |
304 | * 14 0xB0000000 0x50000000 1 128MB 0 0 | |
305 | * 15 0xB8000000 0x58000000 1 128MB 0 0 | |
306 | * | |
307 | * The only entries the we need are the ones that map the kernel | |
308 | * at the cached and uncached addresses. | |
309 | */ | |
310 | for (i = 0; i < PMB_ENTRY_MAX; i++) { | |
311 | unsigned long addr, data; | |
312 | unsigned long addr_val, data_val; | |
313 | unsigned long ppn, vpn; | |
20b5014b | 314 | |
3d467676 MF |
315 | addr = mk_pmb_addr(i); |
316 | data = mk_pmb_data(i); | |
20b5014b | 317 | |
3d467676 MF |
318 | addr_val = __raw_readl(addr); |
319 | data_val = __raw_readl(data); | |
20b5014b | 320 | |
3d467676 MF |
321 | /* |
322 | * Skip over any bogus entries | |
323 | */ | |
324 | if (!(data_val & PMB_V) || !(addr_val & PMB_V)) | |
325 | continue; | |
20b5014b | 326 | |
3d467676 MF |
327 | ppn = data_val & PMB_PFN_MASK; |
328 | vpn = addr_val & PMB_PFN_MASK; | |
a0ab3668 | 329 | |
3d467676 MF |
330 | /* |
331 | * Only preserve in-range mappings. | |
332 | */ | |
333 | if (pmb_ppn_in_range(ppn)) { | |
334 | unsigned int size; | |
335 | char *sz_str = NULL; | |
336 | ||
337 | size = data_val & PMB_SZ_MASK; | |
338 | ||
339 | sz_str = (size == PMB_SZ_16M) ? " 16MB": | |
340 | (size == PMB_SZ_64M) ? " 64MB": | |
341 | (size == PMB_SZ_128M) ? "128MB": | |
342 | "512MB"; | |
343 | ||
344 | pr_info("\t0x%08lx -> 0x%08lx [ %s %scached ]\n", | |
345 | vpn >> PAGE_SHIFT, ppn >> PAGE_SHIFT, sz_str, | |
346 | (data_val & PMB_C) ? "" : "un"); | |
347 | ||
348 | applied++; | |
349 | } else { | |
350 | /* | |
351 | * Invalidate anything out of bounds. | |
352 | */ | |
353 | __raw_writel(addr_val & ~PMB_V, addr); | |
354 | __raw_writel(data_val & ~PMB_V, data); | |
355 | } | |
a0ab3668 PM |
356 | } |
357 | ||
358 | return (applied == 0); | |
359 | } | |
360 | #else | |
361 | static inline int pmb_apply_legacy_mappings(void) | |
362 | { | |
363 | return 1; | |
364 | } | |
365 | #endif | |
366 | ||
367 | int __uses_jump_to_uncached pmb_init(void) | |
368 | { | |
3d467676 MF |
369 | int i; |
370 | unsigned long addr, data; | |
371 | unsigned long ret; | |
a0ab3668 PM |
372 | |
373 | jump_to_uncached(); | |
374 | ||
375 | /* | |
376 | * Attempt to apply the legacy boot mappings if configured. If | |
377 | * this is successful then we simply carry on with those and | |
378 | * don't bother establishing additional memory mappings. Dynamic | |
379 | * device mappings through pmb_remap() can still be bolted on | |
380 | * after this. | |
381 | */ | |
382 | ret = pmb_apply_legacy_mappings(); | |
383 | if (ret == 0) { | |
384 | back_to_cached(); | |
385 | return 0; | |
20b5014b MF |
386 | } |
387 | ||
a0ab3668 | 388 | /* |
3d467676 MF |
389 | * Sync our software copy of the PMB mappings with those in |
390 | * hardware. The mappings in the hardware PMB were either set up | |
391 | * by the bootloader or very early on by the kernel. | |
a0ab3668 | 392 | */ |
3d467676 MF |
393 | for (i = 0; i < PMB_ENTRY_MAX; i++) { |
394 | struct pmb_entry *pmbe; | |
395 | unsigned long vpn, ppn, flags; | |
a0ab3668 | 396 | |
3d467676 MF |
397 | addr = PMB_DATA + (i << PMB_E_SHIFT); |
398 | data = ctrl_inl(addr); | |
399 | if (!(data & PMB_V)) | |
400 | continue; | |
a0ab3668 | 401 | |
3d467676 MF |
402 | if (data & PMB_C) { |
403 | #if defined(CONFIG_CACHE_WRITETHROUGH) | |
404 | data |= PMB_WT; | |
405 | #elif defined(CONFIG_CACHE_WRITEBACK) | |
406 | data &= ~PMB_WT; | |
407 | #else | |
408 | data &= ~(PMB_C | PMB_WT); | |
409 | #endif | |
410 | } | |
411 | ctrl_outl(data, addr); | |
a0ab3668 | 412 | |
3d467676 MF |
413 | ppn = data & PMB_PFN_MASK; |
414 | ||
415 | flags = data & (PMB_C | PMB_WT | PMB_UB); | |
416 | flags |= data & PMB_SZ_MASK; | |
a0ab3668 | 417 | |
3d467676 MF |
418 | addr = PMB_ADDR + (i << PMB_E_SHIFT); |
419 | data = ctrl_inl(addr); | |
420 | ||
421 | vpn = data & PMB_PFN_MASK; | |
422 | ||
423 | pmbe = pmb_alloc(vpn, ppn, flags, i); | |
424 | WARN_ON(IS_ERR(pmbe)); | |
425 | } | |
426 | ||
427 | ctrl_outl(0, PMB_IRMCR); | |
a0ab3668 PM |
428 | |
429 | /* Flush out the TLB */ | |
430 | i = ctrl_inl(MMUCR); | |
431 | i |= MMUCR_TI; | |
432 | ctrl_outl(i, MMUCR); | |
433 | ||
20b5014b MF |
434 | back_to_cached(); |
435 | ||
436 | return 0; | |
437 | } | |
0c7b1df6 | 438 | |
2efa53b2 PM |
439 | bool __in_29bit_mode(void) |
440 | { | |
441 | return (__raw_readl(PMB_PASCR) & PASCR_SE) == 0; | |
442 | } | |
443 | ||
0c7b1df6 PM |
444 | static int pmb_seq_show(struct seq_file *file, void *iter) |
445 | { | |
446 | int i; | |
447 | ||
448 | seq_printf(file, "V: Valid, C: Cacheable, WT: Write-Through\n" | |
449 | "CB: Copy-Back, B: Buffered, UB: Unbuffered\n"); | |
450 | seq_printf(file, "ety vpn ppn size flags\n"); | |
451 | ||
452 | for (i = 0; i < NR_PMB_ENTRIES; i++) { | |
453 | unsigned long addr, data; | |
454 | unsigned int size; | |
455 | char *sz_str = NULL; | |
456 | ||
457 | addr = ctrl_inl(mk_pmb_addr(i)); | |
458 | data = ctrl_inl(mk_pmb_data(i)); | |
459 | ||
460 | size = data & PMB_SZ_MASK; | |
461 | sz_str = (size == PMB_SZ_16M) ? " 16MB": | |
462 | (size == PMB_SZ_64M) ? " 64MB": | |
463 | (size == PMB_SZ_128M) ? "128MB": | |
464 | "512MB"; | |
465 | ||
466 | /* 02: V 0x88 0x08 128MB C CB B */ | |
467 | seq_printf(file, "%02d: %c 0x%02lx 0x%02lx %s %c %s %s\n", | |
468 | i, ((addr & PMB_V) && (data & PMB_V)) ? 'V' : ' ', | |
469 | (addr >> 24) & 0xff, (data >> 24) & 0xff, | |
470 | sz_str, (data & PMB_C) ? 'C' : ' ', | |
471 | (data & PMB_WT) ? "WT" : "CB", | |
472 | (data & PMB_UB) ? "UB" : " B"); | |
473 | } | |
474 | ||
475 | return 0; | |
476 | } | |
477 | ||
478 | static int pmb_debugfs_open(struct inode *inode, struct file *file) | |
479 | { | |
480 | return single_open(file, pmb_seq_show, NULL); | |
481 | } | |
482 | ||
5dfe4c96 | 483 | static const struct file_operations pmb_debugfs_fops = { |
0c7b1df6 PM |
484 | .owner = THIS_MODULE, |
485 | .open = pmb_debugfs_open, | |
486 | .read = seq_read, | |
487 | .llseek = seq_lseek, | |
45dabf14 | 488 | .release = single_release, |
0c7b1df6 PM |
489 | }; |
490 | ||
491 | static int __init pmb_debugfs_init(void) | |
492 | { | |
493 | struct dentry *dentry; | |
494 | ||
495 | dentry = debugfs_create_file("pmb", S_IFREG | S_IRUGO, | |
b9e393c2 | 496 | sh_debugfs_root, NULL, &pmb_debugfs_fops); |
25627c7f Z |
497 | if (!dentry) |
498 | return -ENOMEM; | |
0c7b1df6 PM |
499 | if (IS_ERR(dentry)) |
500 | return PTR_ERR(dentry); | |
501 | ||
502 | return 0; | |
503 | } | |
0c7b1df6 | 504 | postcore_initcall(pmb_debugfs_init); |
a83c0b73 FV |
505 | |
506 | #ifdef CONFIG_PM | |
507 | static int pmb_sysdev_suspend(struct sys_device *dev, pm_message_t state) | |
508 | { | |
509 | static pm_message_t prev_state; | |
edd7de80 | 510 | int i; |
a83c0b73 FV |
511 | |
512 | /* Restore the PMB after a resume from hibernation */ | |
513 | if (state.event == PM_EVENT_ON && | |
514 | prev_state.event == PM_EVENT_FREEZE) { | |
515 | struct pmb_entry *pmbe; | |
edd7de80 MF |
516 | for (i = 0; i < ARRAY_SIZE(pmb_entry_list); i++) { |
517 | if (test_bit(i, &pmb_map)) { | |
518 | pmbe = &pmb_entry_list[i]; | |
519 | set_pmb_entry(pmbe); | |
520 | } | |
521 | } | |
a83c0b73 FV |
522 | } |
523 | prev_state = state; | |
524 | return 0; | |
525 | } | |
526 | ||
527 | static int pmb_sysdev_resume(struct sys_device *dev) | |
528 | { | |
529 | return pmb_sysdev_suspend(dev, PMSG_ON); | |
530 | } | |
531 | ||
532 | static struct sysdev_driver pmb_sysdev_driver = { | |
533 | .suspend = pmb_sysdev_suspend, | |
534 | .resume = pmb_sysdev_resume, | |
535 | }; | |
536 | ||
537 | static int __init pmb_sysdev_init(void) | |
538 | { | |
539 | return sysdev_driver_register(&cpu_sysdev_class, &pmb_sysdev_driver); | |
540 | } | |
a83c0b73 FV |
541 | subsys_initcall(pmb_sysdev_init); |
542 | #endif |