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0c7b1df6 PM |
1 | /* |
2 | * arch/sh/mm/pmb.c | |
3 | * | |
4 | * Privileged Space Mapping Buffer (PMB) Support. | |
5 | * | |
38c425f6 | 6 | * Copyright (C) 2005, 2006, 2007 Paul Mundt |
0c7b1df6 PM |
7 | * |
8 | * P1/P2 Section mapping definitions from map32.h, which was: | |
9 | * | |
10 | * Copyright 2003 (c) Lineo Solutions,Inc. | |
11 | * | |
12 | * This file is subject to the terms and conditions of the GNU General Public | |
13 | * License. See the file "COPYING" in the main directory of this archive | |
14 | * for more details. | |
15 | */ | |
16 | #include <linux/init.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/bitops.h> | |
21 | #include <linux/debugfs.h> | |
22 | #include <linux/fs.h> | |
23 | #include <linux/seq_file.h> | |
24 | #include <linux/err.h> | |
25 | #include <asm/system.h> | |
26 | #include <asm/uaccess.h> | |
d7cdc9e8 | 27 | #include <asm/pgtable.h> |
0c7b1df6 PM |
28 | #include <asm/mmu.h> |
29 | #include <asm/io.h> | |
eddeeb32 | 30 | #include <asm/mmu_context.h> |
0c7b1df6 PM |
31 | |
32 | #define NR_PMB_ENTRIES 16 | |
33 | ||
e18b890b | 34 | static struct kmem_cache *pmb_cache; |
0c7b1df6 PM |
35 | static unsigned long pmb_map; |
36 | ||
37 | static struct pmb_entry pmb_init_map[] = { | |
38 | /* vpn ppn flags (ub/sz/c/wt) */ | |
39 | ||
40 | /* P1 Section Mappings */ | |
41 | { 0x80000000, 0x00000000, PMB_SZ_64M | PMB_C, }, | |
42 | { 0x84000000, 0x04000000, PMB_SZ_64M | PMB_C, }, | |
43 | { 0x88000000, 0x08000000, PMB_SZ_128M | PMB_C, }, | |
44 | { 0x90000000, 0x10000000, PMB_SZ_64M | PMB_C, }, | |
45 | { 0x94000000, 0x14000000, PMB_SZ_64M | PMB_C, }, | |
46 | { 0x98000000, 0x18000000, PMB_SZ_64M | PMB_C, }, | |
47 | ||
48 | /* P2 Section Mappings */ | |
49 | { 0xa0000000, 0x00000000, PMB_UB | PMB_SZ_64M | PMB_WT, }, | |
50 | { 0xa4000000, 0x04000000, PMB_UB | PMB_SZ_64M | PMB_WT, }, | |
51 | { 0xa8000000, 0x08000000, PMB_UB | PMB_SZ_128M | PMB_WT, }, | |
52 | { 0xb0000000, 0x10000000, PMB_UB | PMB_SZ_64M | PMB_WT, }, | |
53 | { 0xb4000000, 0x14000000, PMB_UB | PMB_SZ_64M | PMB_WT, }, | |
54 | { 0xb8000000, 0x18000000, PMB_UB | PMB_SZ_64M | PMB_WT, }, | |
55 | }; | |
56 | ||
57 | static inline unsigned long mk_pmb_entry(unsigned int entry) | |
58 | { | |
59 | return (entry & PMB_E_MASK) << PMB_E_SHIFT; | |
60 | } | |
61 | ||
62 | static inline unsigned long mk_pmb_addr(unsigned int entry) | |
63 | { | |
64 | return mk_pmb_entry(entry) | PMB_ADDR; | |
65 | } | |
66 | ||
67 | static inline unsigned long mk_pmb_data(unsigned int entry) | |
68 | { | |
69 | return mk_pmb_entry(entry) | PMB_DATA; | |
70 | } | |
71 | ||
38c425f6 PM |
72 | static DEFINE_SPINLOCK(pmb_list_lock); |
73 | static struct pmb_entry *pmb_list; | |
74 | ||
75 | static inline void pmb_list_add(struct pmb_entry *pmbe) | |
76 | { | |
77 | struct pmb_entry **p, *tmp; | |
78 | ||
79 | p = &pmb_list; | |
80 | while ((tmp = *p) != NULL) | |
81 | p = &tmp->next; | |
82 | ||
83 | pmbe->next = tmp; | |
84 | *p = pmbe; | |
85 | } | |
86 | ||
87 | static inline void pmb_list_del(struct pmb_entry *pmbe) | |
88 | { | |
89 | struct pmb_entry **p, *tmp; | |
90 | ||
91 | for (p = &pmb_list; (tmp = *p); p = &tmp->next) | |
92 | if (tmp == pmbe) { | |
93 | *p = tmp->next; | |
94 | return; | |
95 | } | |
96 | } | |
97 | ||
0c7b1df6 PM |
98 | struct pmb_entry *pmb_alloc(unsigned long vpn, unsigned long ppn, |
99 | unsigned long flags) | |
100 | { | |
101 | struct pmb_entry *pmbe; | |
102 | ||
103 | pmbe = kmem_cache_alloc(pmb_cache, GFP_KERNEL); | |
104 | if (!pmbe) | |
105 | return ERR_PTR(-ENOMEM); | |
106 | ||
107 | pmbe->vpn = vpn; | |
108 | pmbe->ppn = ppn; | |
109 | pmbe->flags = flags; | |
110 | ||
38c425f6 PM |
111 | spin_lock_irq(&pmb_list_lock); |
112 | pmb_list_add(pmbe); | |
113 | spin_unlock_irq(&pmb_list_lock); | |
114 | ||
0c7b1df6 PM |
115 | return pmbe; |
116 | } | |
117 | ||
118 | void pmb_free(struct pmb_entry *pmbe) | |
119 | { | |
38c425f6 PM |
120 | spin_lock_irq(&pmb_list_lock); |
121 | pmb_list_del(pmbe); | |
122 | spin_unlock_irq(&pmb_list_lock); | |
123 | ||
0c7b1df6 PM |
124 | kmem_cache_free(pmb_cache, pmbe); |
125 | } | |
126 | ||
127 | /* | |
128 | * Must be in P2 for __set_pmb_entry() | |
129 | */ | |
130 | int __set_pmb_entry(unsigned long vpn, unsigned long ppn, | |
131 | unsigned long flags, int *entry) | |
132 | { | |
133 | unsigned int pos = *entry; | |
134 | ||
135 | if (unlikely(pos == PMB_NO_ENTRY)) | |
136 | pos = find_first_zero_bit(&pmb_map, NR_PMB_ENTRIES); | |
137 | ||
138 | repeat: | |
139 | if (unlikely(pos > NR_PMB_ENTRIES)) | |
140 | return -ENOSPC; | |
141 | ||
142 | if (test_and_set_bit(pos, &pmb_map)) { | |
143 | pos = find_first_zero_bit(&pmb_map, NR_PMB_ENTRIES); | |
144 | goto repeat; | |
145 | } | |
146 | ||
147 | ctrl_outl(vpn | PMB_V, mk_pmb_addr(pos)); | |
148 | ||
e7bd34a1 | 149 | #ifdef CONFIG_CACHE_WRITETHROUGH |
0c7b1df6 PM |
150 | /* |
151 | * When we are in 32-bit address extended mode, CCR.CB becomes | |
152 | * invalid, so care must be taken to manually adjust cacheable | |
153 | * translations. | |
154 | */ | |
155 | if (likely(flags & PMB_C)) | |
156 | flags |= PMB_WT; | |
157 | #endif | |
158 | ||
159 | ctrl_outl(ppn | flags | PMB_V, mk_pmb_data(pos)); | |
160 | ||
161 | *entry = pos; | |
162 | ||
163 | return 0; | |
164 | } | |
165 | ||
cbaa118e | 166 | int __uses_jump_to_uncached set_pmb_entry(struct pmb_entry *pmbe) |
0c7b1df6 | 167 | { |
d7cdc9e8 PM |
168 | int ret; |
169 | ||
cbaa118e | 170 | jump_to_uncached(); |
d7cdc9e8 | 171 | ret = __set_pmb_entry(pmbe->vpn, pmbe->ppn, pmbe->flags, &pmbe->entry); |
cbaa118e | 172 | back_to_cached(); |
d7cdc9e8 PM |
173 | |
174 | return ret; | |
0c7b1df6 PM |
175 | } |
176 | ||
cbaa118e | 177 | void __uses_jump_to_uncached clear_pmb_entry(struct pmb_entry *pmbe) |
0c7b1df6 PM |
178 | { |
179 | unsigned int entry = pmbe->entry; | |
180 | unsigned long addr; | |
181 | ||
182 | /* | |
183 | * Don't allow clearing of wired init entries, P1 or P2 access | |
184 | * without a corresponding mapping in the PMB will lead to reset | |
185 | * by the TLB. | |
186 | */ | |
187 | if (unlikely(entry < ARRAY_SIZE(pmb_init_map) || | |
188 | entry >= NR_PMB_ENTRIES)) | |
189 | return; | |
190 | ||
cbaa118e | 191 | jump_to_uncached(); |
0c7b1df6 PM |
192 | |
193 | /* Clear V-bit */ | |
194 | addr = mk_pmb_addr(entry); | |
195 | ctrl_outl(ctrl_inl(addr) & ~PMB_V, addr); | |
196 | ||
197 | addr = mk_pmb_data(entry); | |
198 | ctrl_outl(ctrl_inl(addr) & ~PMB_V, addr); | |
199 | ||
cbaa118e | 200 | back_to_cached(); |
0c7b1df6 PM |
201 | |
202 | clear_bit(entry, &pmb_map); | |
203 | } | |
204 | ||
d7cdc9e8 PM |
205 | |
206 | static struct { | |
207 | unsigned long size; | |
208 | int flag; | |
209 | } pmb_sizes[] = { | |
210 | { .size = 0x20000000, .flag = PMB_SZ_512M, }, | |
211 | { .size = 0x08000000, .flag = PMB_SZ_128M, }, | |
212 | { .size = 0x04000000, .flag = PMB_SZ_64M, }, | |
213 | { .size = 0x01000000, .flag = PMB_SZ_16M, }, | |
214 | }; | |
215 | ||
216 | long pmb_remap(unsigned long vaddr, unsigned long phys, | |
217 | unsigned long size, unsigned long flags) | |
218 | { | |
219 | struct pmb_entry *pmbp; | |
220 | unsigned long wanted; | |
221 | int pmb_flags, i; | |
222 | ||
223 | /* Convert typical pgprot value to the PMB equivalent */ | |
224 | if (flags & _PAGE_CACHABLE) { | |
225 | if (flags & _PAGE_WT) | |
226 | pmb_flags = PMB_WT; | |
227 | else | |
228 | pmb_flags = PMB_C; | |
229 | } else | |
230 | pmb_flags = PMB_WT | PMB_UB; | |
231 | ||
232 | pmbp = NULL; | |
233 | wanted = size; | |
234 | ||
235 | again: | |
236 | for (i = 0; i < ARRAY_SIZE(pmb_sizes); i++) { | |
237 | struct pmb_entry *pmbe; | |
238 | int ret; | |
239 | ||
240 | if (size < pmb_sizes[i].size) | |
241 | continue; | |
242 | ||
243 | pmbe = pmb_alloc(vaddr, phys, pmb_flags | pmb_sizes[i].flag); | |
244 | if (IS_ERR(pmbe)) | |
245 | return PTR_ERR(pmbe); | |
246 | ||
247 | ret = set_pmb_entry(pmbe); | |
248 | if (ret != 0) { | |
249 | pmb_free(pmbe); | |
250 | return -EBUSY; | |
251 | } | |
252 | ||
253 | phys += pmb_sizes[i].size; | |
254 | vaddr += pmb_sizes[i].size; | |
255 | size -= pmb_sizes[i].size; | |
256 | ||
257 | /* | |
258 | * Link adjacent entries that span multiple PMB entries | |
259 | * for easier tear-down. | |
260 | */ | |
261 | if (likely(pmbp)) | |
262 | pmbp->link = pmbe; | |
263 | ||
264 | pmbp = pmbe; | |
265 | } | |
266 | ||
267 | if (size >= 0x1000000) | |
268 | goto again; | |
269 | ||
270 | return wanted - size; | |
271 | } | |
272 | ||
273 | void pmb_unmap(unsigned long addr) | |
274 | { | |
275 | struct pmb_entry **p, *pmbe; | |
276 | ||
277 | for (p = &pmb_list; (pmbe = *p); p = &pmbe->next) | |
278 | if (pmbe->vpn == addr) | |
279 | break; | |
280 | ||
281 | if (unlikely(!pmbe)) | |
282 | return; | |
283 | ||
284 | WARN_ON(!test_bit(pmbe->entry, &pmb_map)); | |
285 | ||
286 | do { | |
287 | struct pmb_entry *pmblink = pmbe; | |
288 | ||
289 | clear_pmb_entry(pmbe); | |
290 | pmbe = pmblink->link; | |
291 | ||
292 | pmb_free(pmblink); | |
293 | } while (pmbe); | |
294 | } | |
295 | ||
51cc5068 | 296 | static void pmb_cache_ctor(void *pmb) |
0c7b1df6 | 297 | { |
d7cdc9e8 PM |
298 | struct pmb_entry *pmbe = pmb; |
299 | ||
0c7b1df6 PM |
300 | memset(pmb, 0, sizeof(struct pmb_entry)); |
301 | ||
d7cdc9e8 | 302 | pmbe->entry = PMB_NO_ENTRY; |
0c7b1df6 PM |
303 | } |
304 | ||
cbaa118e | 305 | static int __uses_jump_to_uncached pmb_init(void) |
0c7b1df6 PM |
306 | { |
307 | unsigned int nr_entries = ARRAY_SIZE(pmb_init_map); | |
53ff0942 | 308 | unsigned int entry, i; |
0c7b1df6 PM |
309 | |
310 | BUG_ON(unlikely(nr_entries >= NR_PMB_ENTRIES)); | |
311 | ||
0e6b9c98 | 312 | pmb_cache = kmem_cache_create("pmb", sizeof(struct pmb_entry), 0, |
20c2df83 | 313 | SLAB_PANIC, pmb_cache_ctor); |
0c7b1df6 | 314 | |
cbaa118e | 315 | jump_to_uncached(); |
0c7b1df6 PM |
316 | |
317 | /* | |
318 | * Ordering is important, P2 must be mapped in the PMB before we | |
319 | * can set PMB.SE, and P1 must be mapped before we jump back to | |
320 | * P1 space. | |
321 | */ | |
322 | for (entry = 0; entry < nr_entries; entry++) { | |
323 | struct pmb_entry *pmbe = pmb_init_map + entry; | |
324 | ||
325 | __set_pmb_entry(pmbe->vpn, pmbe->ppn, pmbe->flags, &entry); | |
326 | } | |
327 | ||
328 | ctrl_outl(0, PMB_IRMCR); | |
329 | ||
330 | /* PMB.SE and UB[7] */ | |
331 | ctrl_outl((1 << 31) | (1 << 7), PMB_PASCR); | |
332 | ||
eddeeb32 SM |
333 | /* Flush out the TLB */ |
334 | i = ctrl_inl(MMUCR); | |
335 | i |= MMUCR_TI; | |
336 | ctrl_outl(i, MMUCR); | |
337 | ||
cbaa118e | 338 | back_to_cached(); |
0c7b1df6 PM |
339 | |
340 | return 0; | |
341 | } | |
0c7b1df6 PM |
342 | arch_initcall(pmb_init); |
343 | ||
0c7b1df6 PM |
344 | static int pmb_seq_show(struct seq_file *file, void *iter) |
345 | { | |
346 | int i; | |
347 | ||
348 | seq_printf(file, "V: Valid, C: Cacheable, WT: Write-Through\n" | |
349 | "CB: Copy-Back, B: Buffered, UB: Unbuffered\n"); | |
350 | seq_printf(file, "ety vpn ppn size flags\n"); | |
351 | ||
352 | for (i = 0; i < NR_PMB_ENTRIES; i++) { | |
353 | unsigned long addr, data; | |
354 | unsigned int size; | |
355 | char *sz_str = NULL; | |
356 | ||
357 | addr = ctrl_inl(mk_pmb_addr(i)); | |
358 | data = ctrl_inl(mk_pmb_data(i)); | |
359 | ||
360 | size = data & PMB_SZ_MASK; | |
361 | sz_str = (size == PMB_SZ_16M) ? " 16MB": | |
362 | (size == PMB_SZ_64M) ? " 64MB": | |
363 | (size == PMB_SZ_128M) ? "128MB": | |
364 | "512MB"; | |
365 | ||
366 | /* 02: V 0x88 0x08 128MB C CB B */ | |
367 | seq_printf(file, "%02d: %c 0x%02lx 0x%02lx %s %c %s %s\n", | |
368 | i, ((addr & PMB_V) && (data & PMB_V)) ? 'V' : ' ', | |
369 | (addr >> 24) & 0xff, (data >> 24) & 0xff, | |
370 | sz_str, (data & PMB_C) ? 'C' : ' ', | |
371 | (data & PMB_WT) ? "WT" : "CB", | |
372 | (data & PMB_UB) ? "UB" : " B"); | |
373 | } | |
374 | ||
375 | return 0; | |
376 | } | |
377 | ||
378 | static int pmb_debugfs_open(struct inode *inode, struct file *file) | |
379 | { | |
380 | return single_open(file, pmb_seq_show, NULL); | |
381 | } | |
382 | ||
5dfe4c96 | 383 | static const struct file_operations pmb_debugfs_fops = { |
0c7b1df6 PM |
384 | .owner = THIS_MODULE, |
385 | .open = pmb_debugfs_open, | |
386 | .read = seq_read, | |
387 | .llseek = seq_lseek, | |
388 | .release = seq_release, | |
389 | }; | |
390 | ||
391 | static int __init pmb_debugfs_init(void) | |
392 | { | |
393 | struct dentry *dentry; | |
394 | ||
395 | dentry = debugfs_create_file("pmb", S_IFREG | S_IRUGO, | |
b9e393c2 | 396 | sh_debugfs_root, NULL, &pmb_debugfs_fops); |
0c7b1df6 PM |
397 | if (IS_ERR(dentry)) |
398 | return PTR_ERR(dentry); | |
399 | ||
400 | return 0; | |
401 | } | |
0c7b1df6 | 402 | postcore_initcall(pmb_debugfs_init); |