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[ALSA] ac97 - enables sound output through speakers on MSI S250 laptop
[linux-2.6.git] / arch / sh / mm / pmb.c
blobb60ad83a7635ceceb19bc8896b5774f7f0c5c001
1 /*
2 * arch/sh/mm/pmb.c
3 *
4 * Privileged Space Mapping Buffer (PMB) Support.
5 *
6 * Copyright (C) 2005, 2006 Paul Mundt
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>
27 #include <asm/pgtable.h>
28 #include <asm/mmu.h>
29 #include <asm/io.h>
30
31 #define NR_PMB_ENTRIES 16
32
33 static struct kmem_cache *pmb_cache;
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
131 int set_pmb_entry(struct pmb_entry *pmbe)
132 {
133 int ret;
134
135 jump_to_P2();
136 ret = __set_pmb_entry(pmbe->vpn, pmbe->ppn, pmbe->flags, &pmbe->entry);
137 back_to_P1();
138
139 return ret;
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
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
286 static void pmb_cache_ctor(void *pmb, struct kmem_cache *cachep, unsigned long flags)
287 {
288 struct pmb_entry *pmbe = pmb;
289
290 memset(pmb, 0, sizeof(struct pmb_entry));
291
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
300 static void pmb_cache_dtor(void *pmb, struct kmem_cache *cachep, unsigned long flags)
301 {
302 spin_lock_irq(&pmb_list_lock);
303 pmb_list_del(pmb);
304 spin_unlock_irq(&pmb_list_lock);
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
314 pmb_cache = kmem_cache_create("pmb", sizeof(struct pmb_entry),
315 0, 0, pmb_cache_ctor, pmb_cache_dtor);
316 BUG_ON(!pmb_cache);
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 }
340 arch_initcall(pmb_init);
341
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
381 static struct file_operations pmb_debugfs_fops = {
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 }
400 postcore_initcall(pmb_debugfs_init);
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