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 <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 */
  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;
 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  */
 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 *
 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 *
 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 *
 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  */
 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 }