release/src-rt-6.x.4708/linux/linux-2.6.36/sound/pci/trident/trident_memory.c

   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 <asm/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 <sound/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 */
  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 }
  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 */
 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 }
 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 */
 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 *
 140 search_empty(struct snd_util_memhdr *hdr, int size)
 141 {
 142         struct snd_util_memblk *blk, *prev;
 143         int page, psize;
 144         struct list_head *p;
 145
 146         psize = get_aligned_page(size + ALIGN_PAGE_SIZE -1);
 147         prev = NULL;
 148         page = 0;
 149         list_for_each(p, &hdr->block) {
 150                 blk = list_entry(p, struct snd_util_memblk, list);
 151                 if (page + psize <= firstpg(blk))
 152                         goto __found_pages;
 153                 page = lastpg(blk) + 1;
 154         }
 155         if (page + psize > MAX_ALIGN_PAGES)
 156                 return NULL;
 157
 158 __found_pages:
 159         /* create a new memory block */
 160         blk = __snd_util_memblk_new(hdr, psize * ALIGN_PAGE_SIZE, p->prev);
 161         if (blk == NULL)
 162                 return NULL;
 163         blk->offset = aligned_page_offset(page); /* set aligned offset */
 164         firstpg(blk) = page;
 165         lastpg(blk) = page + psize - 1;
 166         return blk;
 167 }
 168
 169
 170 /*
 171  * check if the given pointer is valid for pages
 172  */
 173 static int is_valid_page(unsigned long ptr)
 174 {
 175         if (ptr & ~0x3fffffffUL) {
 176                 snd_printk(KERN_ERR "max memory size is 1GB!!\n");
 177                 return 0;
 178         }
 179         if (ptr & (SNDRV_TRIDENT_PAGE_SIZE-1)) {
 180                 snd_printk(KERN_ERR "page is not aligned\n");
 181                 return 0;
 182         }
 183         return 1;
 184 }
 185
 186 /*
 187  * page allocation for DMA (Scatter-Gather version)
 188  */
 189 static struct snd_util_memblk *
 190 snd_trident_alloc_sg_pages(struct snd_trident *trident,
 191                            struct snd_pcm_substream *substream)
 192 {
 193         struct snd_util_memhdr *hdr;
 194         struct snd_util_memblk *blk;
 195         struct snd_pcm_runtime *runtime = substream->runtime;
 196         int idx, page;
 197
 198         if (snd_BUG_ON(runtime->dma_bytes <= 0 ||
 199                        runtime->dma_bytes > SNDRV_TRIDENT_MAX_PAGES *
 200                                         SNDRV_TRIDENT_PAGE_SIZE))
 201                 return NULL;
 202         hdr = trident->tlb.memhdr;
 203         if (snd_BUG_ON(!hdr))
 204                 return NULL;
 205
 206
 207
 208         mutex_lock(&hdr->block_mutex);
 209         blk = search_empty(hdr, runtime->dma_bytes);
 210         if (blk == NULL) {
 211                 mutex_unlock(&hdr->block_mutex);
 212                 return NULL;
 213         }
 214
 215         /* set TLB entries */
 216         idx = 0;
 217         for (page = firstpg(blk); page <= lastpg(blk); page++, idx++) {
 218                 unsigned long ofs = idx << PAGE_SHIFT;
 219                 dma_addr_t addr = snd_pcm_sgbuf_get_addr(substream, ofs);
 220                 unsigned long ptr = (unsigned long)
 221                         snd_pcm_sgbuf_get_ptr(substream, ofs);
 222                 if (! is_valid_page(addr)) {
 223                         __snd_util_mem_free(hdr, blk);
 224                         mutex_unlock(&hdr->block_mutex);
 225                         return NULL;
 226                 }
 227                 set_tlb_bus(trident, page, ptr, addr);
 228         }
 229         mutex_unlock(&hdr->block_mutex);
 230         return blk;
 231 }
 232
 233 /*
 234  * page allocation for DMA (contiguous version)
 235  */
 236 static struct snd_util_memblk *
 237 snd_trident_alloc_cont_pages(struct snd_trident *trident,
 238                              struct snd_pcm_substream *substream)
 239 {
 240         struct snd_util_memhdr *hdr;
 241         struct snd_util_memblk *blk;
 242         int page;
 243         struct snd_pcm_runtime *runtime = substream->runtime;
 244         dma_addr_t addr;
 245         unsigned long ptr;
 246
 247         if (snd_BUG_ON(runtime->dma_bytes <= 0 ||
 248                        runtime->dma_bytes > SNDRV_TRIDENT_MAX_PAGES *
 249                                         SNDRV_TRIDENT_PAGE_SIZE))
 250                 return NULL;
 251         hdr = trident->tlb.memhdr;
 252         if (snd_BUG_ON(!hdr))
 253                 return NULL;
 254
 255         mutex_lock(&hdr->block_mutex);
 256         blk = search_empty(hdr, runtime->dma_bytes);
 257         if (blk == NULL) {
 258                 mutex_unlock(&hdr->block_mutex);
 259                 return NULL;
 260         }
 261
 262         /* set TLB entries */
 263         addr = runtime->dma_addr;
 264         ptr = (unsigned long)runtime->dma_area;
 265         for (page = firstpg(blk); page <= lastpg(blk); page++,
 266              ptr += SNDRV_TRIDENT_PAGE_SIZE, addr += SNDRV_TRIDENT_PAGE_SIZE) {
 267                 if (! is_valid_page(addr)) {
 268                         __snd_util_mem_free(hdr, blk);
 269                         mutex_unlock(&hdr->block_mutex);
 270                         return NULL;
 271                 }
 272                 set_tlb_bus(trident, page, ptr, addr);
 273         }
 274         mutex_unlock(&hdr->block_mutex);
 275         return blk;
 276 }
 277
 278 /*
 279  * page allocation for DMA
 280  */
 281 struct snd_util_memblk *
 282 snd_trident_alloc_pages(struct snd_trident *trident,
 283                         struct snd_pcm_substream *substream)
 284 {
 285         if (snd_BUG_ON(!trident || !substream))
 286                 return NULL;
 287         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_SG)
 288                 return snd_trident_alloc_sg_pages(trident, substream);
 289         else
 290                 return snd_trident_alloc_cont_pages(trident, substream);
 291 }
 292
 293
 294 /*
 295  * release DMA buffer from page table
 296  */
 297 int snd_trident_free_pages(struct snd_trident *trident,
 298                            struct snd_util_memblk *blk)
 299 {
 300         struct snd_util_memhdr *hdr;
 301         int page;
 302
 303         if (snd_BUG_ON(!trident || !blk))
 304                 return -EINVAL;
 305
 306         hdr = trident->tlb.memhdr;
 307         mutex_lock(&hdr->block_mutex);
 308         /* reset TLB entries */
 309         for (page = firstpg(blk); page <= lastpg(blk); page++)
 310                 set_silent_tlb(trident, page);
 311         /* free memory block */
 312         __snd_util_mem_free(hdr, blk);
 313         mutex_unlock(&hdr->block_mutex);
 314         return 0;
 315 }