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0c7b1df6 PM |
1 | /* |
2 | * arch/sh/mm/pmb.c | |
3 | * | |
4 | * Privileged Space Mapping Buffer (PMB) Support. | |
5 | * | |
d7cdc9e8 | 6 | * Copyright (C) 2005, 2006 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> | |
30 | ||
31 | #define NR_PMB_ENTRIES 16 | |
32 | ||
e18b890b | 33 | static struct kmem_cache *pmb_cache; |
0c7b1df6 PM |
34 | static unsigned long pmb_map; |
35 | ||
36 | static struct pmb_entry pmb_init_map[] = { | |
37 | /* vpn ppn flags (ub/sz/c/wt) */ | |
38 | ||
39 | /* P1 Section Mappings */ | |
40 | { 0x80000000, 0x00000000, PMB_SZ_64M | PMB_C, }, | |
41 | { 0x84000000, 0x04000000, PMB_SZ_64M | PMB_C, }, | |
42 | { 0x88000000, 0x08000000, PMB_SZ_128M | PMB_C, }, | |
43 | { 0x90000000, 0x10000000, PMB_SZ_64M | PMB_C, }, | |
44 | { 0x94000000, 0x14000000, PMB_SZ_64M | PMB_C, }, | |
45 | { 0x98000000, 0x18000000, PMB_SZ_64M | PMB_C, }, | |
46 | ||
47 | /* P2 Section Mappings */ | |
48 | { 0xa0000000, 0x00000000, PMB_UB | PMB_SZ_64M | PMB_WT, }, | |
49 | { 0xa4000000, 0x04000000, PMB_UB | PMB_SZ_64M | PMB_WT, }, | |
50 | { 0xa8000000, 0x08000000, PMB_UB | PMB_SZ_128M | PMB_WT, }, | |
51 | { 0xb0000000, 0x10000000, PMB_UB | PMB_SZ_64M | PMB_WT, }, | |
52 | { 0xb4000000, 0x14000000, PMB_UB | PMB_SZ_64M | PMB_WT, }, | |
53 | { 0xb8000000, 0x18000000, PMB_UB | PMB_SZ_64M | PMB_WT, }, | |
54 | }; | |
55 | ||
56 | static inline unsigned long mk_pmb_entry(unsigned int entry) | |
57 | { | |
58 | return (entry & PMB_E_MASK) << PMB_E_SHIFT; | |
59 | } | |
60 | ||
61 | static inline unsigned long mk_pmb_addr(unsigned int entry) | |
62 | { | |
63 | return mk_pmb_entry(entry) | PMB_ADDR; | |
64 | } | |
65 | ||
66 | static inline unsigned long mk_pmb_data(unsigned int entry) | |
67 | { | |
68 | return mk_pmb_entry(entry) | PMB_DATA; | |
69 | } | |
70 | ||
71 | struct pmb_entry *pmb_alloc(unsigned long vpn, unsigned long ppn, | |
72 | unsigned long flags) | |
73 | { | |
74 | struct pmb_entry *pmbe; | |
75 | ||
76 | pmbe = kmem_cache_alloc(pmb_cache, GFP_KERNEL); | |
77 | if (!pmbe) | |
78 | return ERR_PTR(-ENOMEM); | |
79 | ||
80 | pmbe->vpn = vpn; | |
81 | pmbe->ppn = ppn; | |
82 | pmbe->flags = flags; | |
83 | ||
84 | return pmbe; | |
85 | } | |
86 | ||
87 | void pmb_free(struct pmb_entry *pmbe) | |
88 | { | |
89 | kmem_cache_free(pmb_cache, pmbe); | |
90 | } | |
91 | ||
92 | /* | |
93 | * Must be in P2 for __set_pmb_entry() | |
94 | */ | |
95 | int __set_pmb_entry(unsigned long vpn, unsigned long ppn, | |
96 | unsigned long flags, int *entry) | |
97 | { | |
98 | unsigned int pos = *entry; | |
99 | ||
100 | if (unlikely(pos == PMB_NO_ENTRY)) | |
101 | pos = find_first_zero_bit(&pmb_map, NR_PMB_ENTRIES); | |
102 | ||
103 | repeat: | |
104 | if (unlikely(pos > NR_PMB_ENTRIES)) | |
105 | return -ENOSPC; | |
106 | ||
107 | if (test_and_set_bit(pos, &pmb_map)) { | |
108 | pos = find_first_zero_bit(&pmb_map, NR_PMB_ENTRIES); | |
109 | goto repeat; | |
110 | } | |
111 | ||
112 | ctrl_outl(vpn | PMB_V, mk_pmb_addr(pos)); | |
113 | ||
114 | #ifdef CONFIG_SH_WRITETHROUGH | |
115 | /* | |
116 | * When we are in 32-bit address extended mode, CCR.CB becomes | |
117 | * invalid, so care must be taken to manually adjust cacheable | |
118 | * translations. | |
119 | */ | |
120 | if (likely(flags & PMB_C)) | |
121 | flags |= PMB_WT; | |
122 | #endif | |
123 | ||
124 | ctrl_outl(ppn | flags | PMB_V, mk_pmb_data(pos)); | |
125 | ||
126 | *entry = pos; | |
127 | ||
128 | return 0; | |
129 | } | |
130 | ||
d7cdc9e8 | 131 | int set_pmb_entry(struct pmb_entry *pmbe) |
0c7b1df6 | 132 | { |
d7cdc9e8 PM |
133 | int ret; |
134 | ||
0c7b1df6 | 135 | jump_to_P2(); |
d7cdc9e8 | 136 | ret = __set_pmb_entry(pmbe->vpn, pmbe->ppn, pmbe->flags, &pmbe->entry); |
0c7b1df6 | 137 | back_to_P1(); |
d7cdc9e8 PM |
138 | |
139 | return ret; | |
0c7b1df6 PM |
140 | } |
141 | ||
142 | void clear_pmb_entry(struct pmb_entry *pmbe) | |
143 | { | |
144 | unsigned int entry = pmbe->entry; | |
145 | unsigned long addr; | |
146 | ||
147 | /* | |
148 | * Don't allow clearing of wired init entries, P1 or P2 access | |
149 | * without a corresponding mapping in the PMB will lead to reset | |
150 | * by the TLB. | |
151 | */ | |
152 | if (unlikely(entry < ARRAY_SIZE(pmb_init_map) || | |
153 | entry >= NR_PMB_ENTRIES)) | |
154 | return; | |
155 | ||
156 | jump_to_P2(); | |
157 | ||
158 | /* Clear V-bit */ | |
159 | addr = mk_pmb_addr(entry); | |
160 | ctrl_outl(ctrl_inl(addr) & ~PMB_V, addr); | |
161 | ||
162 | addr = mk_pmb_data(entry); | |
163 | ctrl_outl(ctrl_inl(addr) & ~PMB_V, addr); | |
164 | ||
165 | back_to_P1(); | |
166 | ||
167 | clear_bit(entry, &pmb_map); | |
168 | } | |
169 | ||
d7cdc9e8 PM |
170 | static DEFINE_SPINLOCK(pmb_list_lock); |
171 | static struct pmb_entry *pmb_list; | |
172 | ||
173 | static inline void pmb_list_add(struct pmb_entry *pmbe) | |
174 | { | |
175 | struct pmb_entry **p, *tmp; | |
176 | ||
177 | p = &pmb_list; | |
178 | while ((tmp = *p) != NULL) | |
179 | p = &tmp->next; | |
180 | ||
181 | pmbe->next = tmp; | |
182 | *p = pmbe; | |
183 | } | |
184 | ||
185 | static inline void pmb_list_del(struct pmb_entry *pmbe) | |
186 | { | |
187 | struct pmb_entry **p, *tmp; | |
188 | ||
189 | for (p = &pmb_list; (tmp = *p); p = &tmp->next) | |
190 | if (tmp == pmbe) { | |
191 | *p = tmp->next; | |
192 | return; | |
193 | } | |
194 | } | |
195 | ||
196 | static struct { | |
197 | unsigned long size; | |
198 | int flag; | |
199 | } pmb_sizes[] = { | |
200 | { .size = 0x20000000, .flag = PMB_SZ_512M, }, | |
201 | { .size = 0x08000000, .flag = PMB_SZ_128M, }, | |
202 | { .size = 0x04000000, .flag = PMB_SZ_64M, }, | |
203 | { .size = 0x01000000, .flag = PMB_SZ_16M, }, | |
204 | }; | |
205 | ||
206 | long pmb_remap(unsigned long vaddr, unsigned long phys, | |
207 | unsigned long size, unsigned long flags) | |
208 | { | |
209 | struct pmb_entry *pmbp; | |
210 | unsigned long wanted; | |
211 | int pmb_flags, i; | |
212 | ||
213 | /* Convert typical pgprot value to the PMB equivalent */ | |
214 | if (flags & _PAGE_CACHABLE) { | |
215 | if (flags & _PAGE_WT) | |
216 | pmb_flags = PMB_WT; | |
217 | else | |
218 | pmb_flags = PMB_C; | |
219 | } else | |
220 | pmb_flags = PMB_WT | PMB_UB; | |
221 | ||
222 | pmbp = NULL; | |
223 | wanted = size; | |
224 | ||
225 | again: | |
226 | for (i = 0; i < ARRAY_SIZE(pmb_sizes); i++) { | |
227 | struct pmb_entry *pmbe; | |
228 | int ret; | |
229 | ||
230 | if (size < pmb_sizes[i].size) | |
231 | continue; | |
232 | ||
233 | pmbe = pmb_alloc(vaddr, phys, pmb_flags | pmb_sizes[i].flag); | |
234 | if (IS_ERR(pmbe)) | |
235 | return PTR_ERR(pmbe); | |
236 | ||
237 | ret = set_pmb_entry(pmbe); | |
238 | if (ret != 0) { | |
239 | pmb_free(pmbe); | |
240 | return -EBUSY; | |
241 | } | |
242 | ||
243 | phys += pmb_sizes[i].size; | |
244 | vaddr += pmb_sizes[i].size; | |
245 | size -= pmb_sizes[i].size; | |
246 | ||
247 | /* | |
248 | * Link adjacent entries that span multiple PMB entries | |
249 | * for easier tear-down. | |
250 | */ | |
251 | if (likely(pmbp)) | |
252 | pmbp->link = pmbe; | |
253 | ||
254 | pmbp = pmbe; | |
255 | } | |
256 | ||
257 | if (size >= 0x1000000) | |
258 | goto again; | |
259 | ||
260 | return wanted - size; | |
261 | } | |
262 | ||
263 | void pmb_unmap(unsigned long addr) | |
264 | { | |
265 | struct pmb_entry **p, *pmbe; | |
266 | ||
267 | for (p = &pmb_list; (pmbe = *p); p = &pmbe->next) | |
268 | if (pmbe->vpn == addr) | |
269 | break; | |
270 | ||
271 | if (unlikely(!pmbe)) | |
272 | return; | |
273 | ||
274 | WARN_ON(!test_bit(pmbe->entry, &pmb_map)); | |
275 | ||
276 | do { | |
277 | struct pmb_entry *pmblink = pmbe; | |
278 | ||
279 | clear_pmb_entry(pmbe); | |
280 | pmbe = pmblink->link; | |
281 | ||
282 | pmb_free(pmblink); | |
283 | } while (pmbe); | |
284 | } | |
285 | ||
e18b890b | 286 | static void pmb_cache_ctor(void *pmb, struct kmem_cache *cachep, unsigned long flags) |
0c7b1df6 | 287 | { |
d7cdc9e8 PM |
288 | struct pmb_entry *pmbe = pmb; |
289 | ||
0c7b1df6 PM |
290 | memset(pmb, 0, sizeof(struct pmb_entry)); |
291 | ||
d7cdc9e8 PM |
292 | spin_lock_irq(&pmb_list_lock); |
293 | ||
294 | pmbe->entry = PMB_NO_ENTRY; | |
295 | pmb_list_add(pmbe); | |
296 | ||
297 | spin_unlock_irq(&pmb_list_lock); | |
298 | } | |
299 | ||
e18b890b | 300 | static void pmb_cache_dtor(void *pmb, struct kmem_cache *cachep, unsigned long flags) |
d7cdc9e8 PM |
301 | { |
302 | spin_lock_irq(&pmb_list_lock); | |
303 | pmb_list_del(pmb); | |
304 | spin_unlock_irq(&pmb_list_lock); | |
0c7b1df6 PM |
305 | } |
306 | ||
307 | static int __init pmb_init(void) | |
308 | { | |
309 | unsigned int nr_entries = ARRAY_SIZE(pmb_init_map); | |
310 | unsigned int entry; | |
311 | ||
312 | BUG_ON(unlikely(nr_entries >= NR_PMB_ENTRIES)); | |
313 | ||
0e6b9c98 AM |
314 | pmb_cache = kmem_cache_create("pmb", sizeof(struct pmb_entry), 0, |
315 | SLAB_PANIC, pmb_cache_ctor, | |
316 | pmb_cache_dtor); | |
0c7b1df6 PM |
317 | |
318 | jump_to_P2(); | |
319 | ||
320 | /* | |
321 | * Ordering is important, P2 must be mapped in the PMB before we | |
322 | * can set PMB.SE, and P1 must be mapped before we jump back to | |
323 | * P1 space. | |
324 | */ | |
325 | for (entry = 0; entry < nr_entries; entry++) { | |
326 | struct pmb_entry *pmbe = pmb_init_map + entry; | |
327 | ||
328 | __set_pmb_entry(pmbe->vpn, pmbe->ppn, pmbe->flags, &entry); | |
329 | } | |
330 | ||
331 | ctrl_outl(0, PMB_IRMCR); | |
332 | ||
333 | /* PMB.SE and UB[7] */ | |
334 | ctrl_outl((1 << 31) | (1 << 7), PMB_PASCR); | |
335 | ||
336 | back_to_P1(); | |
337 | ||
338 | return 0; | |
339 | } | |
0c7b1df6 PM |
340 | arch_initcall(pmb_init); |
341 | ||
0c7b1df6 PM |
342 | static int pmb_seq_show(struct seq_file *file, void *iter) |
343 | { | |
344 | int i; | |
345 | ||
346 | seq_printf(file, "V: Valid, C: Cacheable, WT: Write-Through\n" | |
347 | "CB: Copy-Back, B: Buffered, UB: Unbuffered\n"); | |
348 | seq_printf(file, "ety vpn ppn size flags\n"); | |
349 | ||
350 | for (i = 0; i < NR_PMB_ENTRIES; i++) { | |
351 | unsigned long addr, data; | |
352 | unsigned int size; | |
353 | char *sz_str = NULL; | |
354 | ||
355 | addr = ctrl_inl(mk_pmb_addr(i)); | |
356 | data = ctrl_inl(mk_pmb_data(i)); | |
357 | ||
358 | size = data & PMB_SZ_MASK; | |
359 | sz_str = (size == PMB_SZ_16M) ? " 16MB": | |
360 | (size == PMB_SZ_64M) ? " 64MB": | |
361 | (size == PMB_SZ_128M) ? "128MB": | |
362 | "512MB"; | |
363 | ||
364 | /* 02: V 0x88 0x08 128MB C CB B */ | |
365 | seq_printf(file, "%02d: %c 0x%02lx 0x%02lx %s %c %s %s\n", | |
366 | i, ((addr & PMB_V) && (data & PMB_V)) ? 'V' : ' ', | |
367 | (addr >> 24) & 0xff, (data >> 24) & 0xff, | |
368 | sz_str, (data & PMB_C) ? 'C' : ' ', | |
369 | (data & PMB_WT) ? "WT" : "CB", | |
370 | (data & PMB_UB) ? "UB" : " B"); | |
371 | } | |
372 | ||
373 | return 0; | |
374 | } | |
375 | ||
376 | static int pmb_debugfs_open(struct inode *inode, struct file *file) | |
377 | { | |
378 | return single_open(file, pmb_seq_show, NULL); | |
379 | } | |
380 | ||
5dfe4c96 | 381 | static const struct file_operations pmb_debugfs_fops = { |
0c7b1df6 PM |
382 | .owner = THIS_MODULE, |
383 | .open = pmb_debugfs_open, | |
384 | .read = seq_read, | |
385 | .llseek = seq_lseek, | |
386 | .release = seq_release, | |
387 | }; | |
388 | ||
389 | static int __init pmb_debugfs_init(void) | |
390 | { | |
391 | struct dentry *dentry; | |
392 | ||
393 | dentry = debugfs_create_file("pmb", S_IFREG | S_IRUGO, | |
394 | NULL, NULL, &pmb_debugfs_fops); | |
395 | if (IS_ERR(dentry)) | |
396 | return PTR_ERR(dentry); | |
397 | ||
398 | return 0; | |
399 | } | |
0c7b1df6 | 400 | postcore_initcall(pmb_debugfs_init); |