linux/sound/pci/trident/trident_memory.c
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   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 */
  72static 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}
  79static 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 */
 102static 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}
 113static 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 */
 124static 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 */
 139static struct snd_util_memblk *
 140search_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 */
 173static 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 */
 189static struct snd_util_memblk *
 190snd_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 */
 236static struct snd_util_memblk *
 237snd_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 */
 281struct snd_util_memblk *
 282snd_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 */
 297int 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}
 316