1 /*
2 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
3 * Copyright (c) by Takashi Iwai <tiwai@suse.de>
4 * Copyright (c) by Scott McNab <sdm@fractalgraphics.com.au>
5 *
6 * Trident 4DWave-NX memory page allocation (TLB area)
7 * Trident chip can handle only 16MByte of the memory at the same time.
8 *
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 *
24 */
25
26 #include <linux/io.h>
27 #include <linux/pci.h>
28 #include <linux/time.h>
29 #include <linux/mutex.h>
30
31 #include <sound/core.h>
32 #include "trident.h"
33
34 /* page arguments of these two macros are Trident page (4096 bytes), not like
35 * aligned pages in others
36 */
37 #define __set_tlb_bus(trident,page,ptr,addr) \
38 do { (trident)->tlb.entries[page] = cpu_to_le32((addr) & ~(SNDRV_TRIDENT_PAGE_SIZE-1)); \
39 (trident)->tlb.shadow_entries[page] = (ptr); } while (0)
40 #define __tlb_to_ptr(trident,page) \
41 (void*)((trident)->tlb.shadow_entries[page])
42 #define __tlb_to_addr(trident,page) \
43 (dma_addr_t)le32_to_cpu((trident->tlb.entries[page]) & ~(SNDRV_TRIDENT_PAGE_SIZE - 1))
44
45 #if PAGE_SIZE == 4096
46 /* page size == SNDRV_TRIDENT_PAGE_SIZE */
47 #define ALIGN_PAGE_SIZE PAGE_SIZE /* minimum page size for allocation */
48 #define MAX_ALIGN_PAGES SNDRV_TRIDENT_MAX_PAGES /* maxmium aligned pages */
49 /* fill TLB entrie(s) corresponding to page with ptr */
50 #define set_tlb_bus(trident,page,ptr,addr) __set_tlb_bus(trident,page,ptr,addr)
51 /* fill TLB entrie(s) corresponding to page with silence pointer */
52 #define set_silent_tlb(trident,page) __set_tlb_bus(trident, page, (unsigned long)trident->tlb.silent_page.area, trident->tlb.silent_page.addr)
53 /* get aligned page from offset address */
54 #define get_aligned_page(offset) ((offset) >> 12)
55 /* get offset address from aligned page */
56 #define aligned_page_offset(page) ((page) << 12)
57 /* get buffer address from aligned page */
58 #define page_to_ptr(trident,page) __tlb_to_ptr(trident, page)
59 /* get PCI physical address from aligned page */
60 #define page_to_addr(trident,page) __tlb_to_addr(trident, page)
61
62 #elif PAGE_SIZE == 8192
63 /* page size == SNDRV_TRIDENT_PAGE_SIZE x 2*/
64 #define ALIGN_PAGE_SIZE PAGE_SIZE
65 #define MAX_ALIGN_PAGES (SNDRV_TRIDENT_MAX_PAGES / 2)
66 #define get_aligned_page(offset) ((offset) >> 13)
67 #define aligned_page_offset(page) ((page) << 13)
68 #define page_to_ptr(trident,page) __tlb_to_ptr(trident, (page) << 1)
69 #define page_to_addr(trident,page) __tlb_to_addr(trident, (page) << 1)
70
71 /* fill TLB entries -- we need to fill two entries */
set_tlb_bus(struct snd_trident * trident,int page,unsigned long ptr,dma_addr_t addr)72 static inline void set_tlb_bus(struct snd_trident *trident, int page,
73 unsigned long ptr, dma_addr_t addr)
74 {
75 page <<= 1;
76 __set_tlb_bus(trident, page, ptr, addr);
77 __set_tlb_bus(trident, page+1, ptr + SNDRV_TRIDENT_PAGE_SIZE, addr + SNDRV_TRIDENT_PAGE_SIZE);
78 }
set_silent_tlb(struct snd_trident * trident,int page)79 static inline void set_silent_tlb(struct snd_trident *trident, int page)
80 {
81 page <<= 1;
82 __set_tlb_bus(trident, page, (unsigned long)trident->tlb.silent_page.area, trident->tlb.silent_page.addr);
83 __set_tlb_bus(trident, page+1, (unsigned long)trident->tlb.silent_page.area, trident->tlb.silent_page.addr);
84 }
85
86 #else
87 /* arbitrary size */
88 #define UNIT_PAGES (PAGE_SIZE / SNDRV_TRIDENT_PAGE_SIZE)
89 #define ALIGN_PAGE_SIZE (SNDRV_TRIDENT_PAGE_SIZE * UNIT_PAGES)
90 #define MAX_ALIGN_PAGES (SNDRV_TRIDENT_MAX_PAGES / UNIT_PAGES)
91 /* Note: if alignment doesn't match to the maximum size, the last few blocks
92 * become unusable. To use such blocks, you'll need to check the validity
93 * of accessing page in set_tlb_bus and set_silent_tlb. search_empty()
94 * should also check it, too.
95 */
96 #define get_aligned_page(offset) ((offset) / ALIGN_PAGE_SIZE)
97 #define aligned_page_offset(page) ((page) * ALIGN_PAGE_SIZE)
98 #define page_to_ptr(trident,page) __tlb_to_ptr(trident, (page) * UNIT_PAGES)
99 #define page_to_addr(trident,page) __tlb_to_addr(trident, (page) * UNIT_PAGES)
100
101 /* fill TLB entries -- UNIT_PAGES entries must be filled */
set_tlb_bus(struct snd_trident * trident,int page,unsigned long ptr,dma_addr_t addr)102 static inline void set_tlb_bus(struct snd_trident *trident, int page,
103 unsigned long ptr, dma_addr_t addr)
104 {
105 int i;
106 page *= UNIT_PAGES;
107 for (i = 0; i < UNIT_PAGES; i++, page++) {
108 __set_tlb_bus(trident, page, ptr, addr);
109 ptr += SNDRV_TRIDENT_PAGE_SIZE;
110 addr += SNDRV_TRIDENT_PAGE_SIZE;
111 }
112 }
set_silent_tlb(struct snd_trident * trident,int page)113 static inline void set_silent_tlb(struct snd_trident *trident, int page)
114 {
115 int i;
116 page *= UNIT_PAGES;
117 for (i = 0; i < UNIT_PAGES; i++, page++)
118 __set_tlb_bus(trident, page, (unsigned long)trident->tlb.silent_page.area, trident->tlb.silent_page.addr);
119 }
120
121 #endif /* PAGE_SIZE */
122
123 /* calculate buffer pointer from offset address */
offset_ptr(struct snd_trident * trident,int offset)124 static inline void *offset_ptr(struct snd_trident *trident, int offset)
125 {
126 char *ptr;
127 ptr = page_to_ptr(trident, get_aligned_page(offset));
128 ptr += offset % ALIGN_PAGE_SIZE;
129 return (void*)ptr;
130 }
131
132 /* first and last (aligned) pages of memory block */
133 #define firstpg(blk) (((struct snd_trident_memblk_arg *)snd_util_memblk_argptr(blk))->first_page)
134 #define lastpg(blk) (((struct snd_trident_memblk_arg *)snd_util_memblk_argptr(blk))->last_page)
135
136 /*
137 * search empty pages which may contain given size
138 */
139 static struct snd_util_memblk *
search_empty(struct snd_util_memhdr * hdr,int size)140 search_empty(struct snd_util_memhdr *hdr, int size)
141 {
142 struct snd_util_memblk *blk;
143 int page, psize;
144 struct list_head *p;
145
146 psize = get_aligned_page(size + ALIGN_PAGE_SIZE -1);
147 page = 0;
148 list_for_each(p, &hdr->block) {
149 blk = list_entry(p, struct snd_util_memblk, list);
150 if (page + psize <= firstpg(blk))
151 goto __found_pages;
152 page = lastpg(blk) + 1;
153 }
154 if (page + psize > MAX_ALIGN_PAGES)
155 return NULL;
156
157 __found_pages:
158 /* create a new memory block */
159 blk = __snd_util_memblk_new(hdr, psize * ALIGN_PAGE_SIZE, p->prev);
160 if (blk == NULL)
161 return NULL;
162 blk->offset = aligned_page_offset(page); /* set aligned offset */
163 firstpg(blk) = page;
164 lastpg(blk) = page + psize - 1;
165 return blk;
166 }
167
168
169 /*
170 * check if the given pointer is valid for pages
171 */
is_valid_page(unsigned long ptr)172 static int is_valid_page(unsigned long ptr)
173 {
174 if (ptr & ~0x3fffffffUL) {
175 snd_printk(KERN_ERR "max memory size is 1GB!!\n");
176 return 0;
177 }
178 if (ptr & (SNDRV_TRIDENT_PAGE_SIZE-1)) {
179 snd_printk(KERN_ERR "page is not aligned\n");
180 return 0;
181 }
182 return 1;
183 }
184
185 /*
186 * page allocation for DMA (Scatter-Gather version)
187 */
188 static struct snd_util_memblk *
snd_trident_alloc_sg_pages(struct snd_trident * trident,struct snd_pcm_substream * substream)189 snd_trident_alloc_sg_pages(struct snd_trident *trident,
190 struct snd_pcm_substream *substream)
191 {
192 struct snd_util_memhdr *hdr;
193 struct snd_util_memblk *blk;
194 struct snd_pcm_runtime *runtime = substream->runtime;
195 int idx, page;
196
197 if (snd_BUG_ON(runtime->dma_bytes <= 0 ||
198 runtime->dma_bytes > SNDRV_TRIDENT_MAX_PAGES *
199 SNDRV_TRIDENT_PAGE_SIZE))
200 return NULL;
201 hdr = trident->tlb.memhdr;
202 if (snd_BUG_ON(!hdr))
203 return NULL;
204
205
206
207 mutex_lock(&hdr->block_mutex);
208 blk = search_empty(hdr, runtime->dma_bytes);
209 if (blk == NULL) {
210 mutex_unlock(&hdr->block_mutex);
211 return NULL;
212 }
213
214 /* set TLB entries */
215 idx = 0;
216 for (page = firstpg(blk); page <= lastpg(blk); page++, idx++) {
217 unsigned long ofs = idx << PAGE_SHIFT;
218 dma_addr_t addr = snd_pcm_sgbuf_get_addr(substream, ofs);
219 unsigned long ptr = (unsigned long)
220 snd_pcm_sgbuf_get_ptr(substream, ofs);
221 if (! is_valid_page(addr)) {
222 __snd_util_mem_free(hdr, blk);
223 mutex_unlock(&hdr->block_mutex);
224 return NULL;
225 }
226 set_tlb_bus(trident, page, ptr, addr);
227 }
228 mutex_unlock(&hdr->block_mutex);
229 return blk;
230 }
231
232 /*
233 * page allocation for DMA (contiguous version)
234 */
235 static struct snd_util_memblk *
snd_trident_alloc_cont_pages(struct snd_trident * trident,struct snd_pcm_substream * substream)236 snd_trident_alloc_cont_pages(struct snd_trident *trident,
237 struct snd_pcm_substream *substream)
238 {
239 struct snd_util_memhdr *hdr;
240 struct snd_util_memblk *blk;
241 int page;
242 struct snd_pcm_runtime *runtime = substream->runtime;
243 dma_addr_t addr;
244 unsigned long ptr;
245
246 if (snd_BUG_ON(runtime->dma_bytes <= 0 ||
247 runtime->dma_bytes > SNDRV_TRIDENT_MAX_PAGES *
248 SNDRV_TRIDENT_PAGE_SIZE))
249 return NULL;
250 hdr = trident->tlb.memhdr;
251 if (snd_BUG_ON(!hdr))
252 return NULL;
253
254 mutex_lock(&hdr->block_mutex);
255 blk = search_empty(hdr, runtime->dma_bytes);
256 if (blk == NULL) {
257 mutex_unlock(&hdr->block_mutex);
258 return NULL;
259 }
260
261 /* set TLB entries */
262 addr = runtime->dma_addr;
263 ptr = (unsigned long)runtime->dma_area;
264 for (page = firstpg(blk); page <= lastpg(blk); page++,
265 ptr += SNDRV_TRIDENT_PAGE_SIZE, addr += SNDRV_TRIDENT_PAGE_SIZE) {
266 if (! is_valid_page(addr)) {
267 __snd_util_mem_free(hdr, blk);
268 mutex_unlock(&hdr->block_mutex);
269 return NULL;
270 }
271 set_tlb_bus(trident, page, ptr, addr);
272 }
273 mutex_unlock(&hdr->block_mutex);
274 return blk;
275 }
276
277 /*
278 * page allocation for DMA
279 */
280 struct snd_util_memblk *
snd_trident_alloc_pages(struct snd_trident * trident,struct snd_pcm_substream * substream)281 snd_trident_alloc_pages(struct snd_trident *trident,
282 struct snd_pcm_substream *substream)
283 {
284 if (snd_BUG_ON(!trident || !substream))
285 return NULL;
286 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_SG)
287 return snd_trident_alloc_sg_pages(trident, substream);
288 else
289 return snd_trident_alloc_cont_pages(trident, substream);
290 }
291
292
293 /*
294 * release DMA buffer from page table
295 */
snd_trident_free_pages(struct snd_trident * trident,struct snd_util_memblk * blk)296 int snd_trident_free_pages(struct snd_trident *trident,
297 struct snd_util_memblk *blk)
298 {
299 struct snd_util_memhdr *hdr;
300 int page;
301
302 if (snd_BUG_ON(!trident || !blk))
303 return -EINVAL;
304
305 hdr = trident->tlb.memhdr;
306 mutex_lock(&hdr->block_mutex);
307 /* reset TLB entries */
308 for (page = firstpg(blk); page <= lastpg(blk); page++)
309 set_silent_tlb(trident, page);
310 /* free memory block */
311 __snd_util_mem_free(hdr, blk);
312 mutex_unlock(&hdr->block_mutex);
313 return 0;
314 }
315