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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>4 * Copyright (c) by Takashi Iwai <tiwai@suse.de>5 * Copyright (c) by Scott McNab <sdm@fractalgraphics.com.au>6 *7 * Trident 4DWave-NX memory page allocation (TLB area)8 * Trident chip can handle only 16MByte of the memory at the same time.9 */10 11#include <linux/io.h>12#include <linux/pci.h>13#include <linux/time.h>14#include <linux/mutex.h>15 16#include <sound/core.h>17#include "trident.h"18 19/* page arguments of these two macros are Trident page (4096 bytes), not like20 * aligned pages in others21 */22#define __set_tlb_bus(trident,page,addr) \23 (trident)->tlb.entries[page] = cpu_to_le32((addr) & ~(SNDRV_TRIDENT_PAGE_SIZE-1))24#define __tlb_to_addr(trident,page) \25 (dma_addr_t)le32_to_cpu((trident->tlb.entries[page]) & ~(SNDRV_TRIDENT_PAGE_SIZE - 1))26 27#if PAGE_SIZE == 409628/* page size == SNDRV_TRIDENT_PAGE_SIZE */29#define ALIGN_PAGE_SIZE PAGE_SIZE /* minimum page size for allocation */30#define MAX_ALIGN_PAGES SNDRV_TRIDENT_MAX_PAGES /* maxmium aligned pages */31/* fill TLB entrie(s) corresponding to page with ptr */32#define set_tlb_bus(trident,page,addr) __set_tlb_bus(trident,page,addr)33/* fill TLB entrie(s) corresponding to page with silence pointer */34#define set_silent_tlb(trident,page) __set_tlb_bus(trident, page, trident->tlb.silent_page->addr)35/* get aligned page from offset address */36#define get_aligned_page(offset) ((offset) >> 12)37/* get offset address from aligned page */38#define aligned_page_offset(page) ((page) << 12)39/* get PCI physical address from aligned page */40#define page_to_addr(trident,page) __tlb_to_addr(trident, page)41 42#elif PAGE_SIZE == 819243/* page size == SNDRV_TRIDENT_PAGE_SIZE x 2*/44#define ALIGN_PAGE_SIZE PAGE_SIZE45#define MAX_ALIGN_PAGES (SNDRV_TRIDENT_MAX_PAGES / 2)46#define get_aligned_page(offset) ((offset) >> 13)47#define aligned_page_offset(page) ((page) << 13)48#define page_to_addr(trident,page) __tlb_to_addr(trident, (page) << 1)49 50/* fill TLB entries -- we need to fill two entries */51static inline void set_tlb_bus(struct snd_trident *trident, int page,52 dma_addr_t addr)53{54 page <<= 1;55 __set_tlb_bus(trident, page, addr);56 __set_tlb_bus(trident, page+1, addr + SNDRV_TRIDENT_PAGE_SIZE);57}58static inline void set_silent_tlb(struct snd_trident *trident, int page)59{60 page <<= 1;61 __set_tlb_bus(trident, page, trident->tlb.silent_page->addr);62 __set_tlb_bus(trident, page+1, trident->tlb.silent_page->addr);63}64 65#else66/* arbitrary size */67#define UNIT_PAGES (PAGE_SIZE / SNDRV_TRIDENT_PAGE_SIZE)68#define ALIGN_PAGE_SIZE (SNDRV_TRIDENT_PAGE_SIZE * UNIT_PAGES)69#define MAX_ALIGN_PAGES (SNDRV_TRIDENT_MAX_PAGES / UNIT_PAGES)70/* Note: if alignment doesn't match to the maximum size, the last few blocks71 * become unusable. To use such blocks, you'll need to check the validity72 * of accessing page in set_tlb_bus and set_silent_tlb. search_empty()73 * should also check it, too.74 */75#define get_aligned_page(offset) ((offset) / ALIGN_PAGE_SIZE)76#define aligned_page_offset(page) ((page) * ALIGN_PAGE_SIZE)77#define page_to_addr(trident,page) __tlb_to_addr(trident, (page) * UNIT_PAGES)78 79/* fill TLB entries -- UNIT_PAGES entries must be filled */80static inline void set_tlb_bus(struct snd_trident *trident, int page,81 dma_addr_t addr)82{83 int i;84 page *= UNIT_PAGES;85 for (i = 0; i < UNIT_PAGES; i++, page++) {86 __set_tlb_bus(trident, page, addr);87 addr += SNDRV_TRIDENT_PAGE_SIZE;88 }89}90static inline void set_silent_tlb(struct snd_trident *trident, int page)91{92 int i;93 page *= UNIT_PAGES;94 for (i = 0; i < UNIT_PAGES; i++, page++)95 __set_tlb_bus(trident, page, trident->tlb.silent_page->addr);96}97 98#endif /* PAGE_SIZE */99 100/* first and last (aligned) pages of memory block */101#define firstpg(blk) (((struct snd_trident_memblk_arg *)snd_util_memblk_argptr(blk))->first_page)102#define lastpg(blk) (((struct snd_trident_memblk_arg *)snd_util_memblk_argptr(blk))->last_page)103 104/*105 * search empty pages which may contain given size106 */107static struct snd_util_memblk *108search_empty(struct snd_util_memhdr *hdr, int size)109{110 struct snd_util_memblk *blk;111 int page, psize;112 struct list_head *p;113 114 psize = get_aligned_page(size + ALIGN_PAGE_SIZE -1);115 page = 0;116 list_for_each(p, &hdr->block) {117 blk = list_entry(p, struct snd_util_memblk, list);118 if (page + psize <= firstpg(blk))119 goto __found_pages;120 page = lastpg(blk) + 1;121 }122 if (page + psize > MAX_ALIGN_PAGES)123 return NULL;124 125__found_pages:126 /* create a new memory block */127 blk = __snd_util_memblk_new(hdr, psize * ALIGN_PAGE_SIZE, p->prev);128 if (blk == NULL)129 return NULL;130 blk->offset = aligned_page_offset(page); /* set aligned offset */131 firstpg(blk) = page;132 lastpg(blk) = page + psize - 1;133 return blk;134}135 136 137/*138 * check if the given pointer is valid for pages139 */140static int is_valid_page(struct snd_trident *trident, unsigned long ptr)141{142 if (ptr & ~0x3fffffffUL) {143 dev_err(trident->card->dev, "max memory size is 1GB!!\n");144 return 0;145 }146 if (ptr & (SNDRV_TRIDENT_PAGE_SIZE-1)) {147 dev_err(trident->card->dev, "page is not aligned\n");148 return 0;149 }150 return 1;151}152 153/*154 * page allocation for DMA (Scatter-Gather version)155 */156static struct snd_util_memblk *157snd_trident_alloc_sg_pages(struct snd_trident *trident,158 struct snd_pcm_substream *substream)159{160 struct snd_util_memhdr *hdr;161 struct snd_util_memblk *blk;162 struct snd_pcm_runtime *runtime = substream->runtime;163 int idx, page;164 165 if (snd_BUG_ON(runtime->dma_bytes <= 0 ||166 runtime->dma_bytes > SNDRV_TRIDENT_MAX_PAGES *167 SNDRV_TRIDENT_PAGE_SIZE))168 return NULL;169 hdr = trident->tlb.memhdr;170 if (snd_BUG_ON(!hdr))171 return NULL;172 173 174 175 mutex_lock(&hdr->block_mutex);176 blk = search_empty(hdr, runtime->dma_bytes);177 if (blk == NULL) {178 mutex_unlock(&hdr->block_mutex);179 return NULL;180 }181 182 /* set TLB entries */183 idx = 0;184 for (page = firstpg(blk); page <= lastpg(blk); page++, idx++) {185 unsigned long ofs = idx << PAGE_SHIFT;186 dma_addr_t addr = snd_pcm_sgbuf_get_addr(substream, ofs);187 if (!is_valid_page(trident, addr)) {188 __snd_util_mem_free(hdr, blk);189 mutex_unlock(&hdr->block_mutex);190 return NULL;191 }192 set_tlb_bus(trident, page, addr);193 }194 mutex_unlock(&hdr->block_mutex);195 return blk;196}197 198/*199 * page allocation for DMA (contiguous version)200 */201static struct snd_util_memblk *202snd_trident_alloc_cont_pages(struct snd_trident *trident,203 struct snd_pcm_substream *substream)204{205 struct snd_util_memhdr *hdr;206 struct snd_util_memblk *blk;207 int page;208 struct snd_pcm_runtime *runtime = substream->runtime;209 dma_addr_t addr;210 211 if (snd_BUG_ON(runtime->dma_bytes <= 0 ||212 runtime->dma_bytes > SNDRV_TRIDENT_MAX_PAGES *213 SNDRV_TRIDENT_PAGE_SIZE))214 return NULL;215 hdr = trident->tlb.memhdr;216 if (snd_BUG_ON(!hdr))217 return NULL;218 219 mutex_lock(&hdr->block_mutex);220 blk = search_empty(hdr, runtime->dma_bytes);221 if (blk == NULL) {222 mutex_unlock(&hdr->block_mutex);223 return NULL;224 }225 226 /* set TLB entries */227 addr = runtime->dma_addr;228 for (page = firstpg(blk); page <= lastpg(blk); page++,229 addr += SNDRV_TRIDENT_PAGE_SIZE) {230 if (!is_valid_page(trident, addr)) {231 __snd_util_mem_free(hdr, blk);232 mutex_unlock(&hdr->block_mutex);233 return NULL;234 }235 set_tlb_bus(trident, page, addr);236 }237 mutex_unlock(&hdr->block_mutex);238 return blk;239}240 241/*242 * page allocation for DMA243 */244struct snd_util_memblk *245snd_trident_alloc_pages(struct snd_trident *trident,246 struct snd_pcm_substream *substream)247{248 if (snd_BUG_ON(!trident || !substream))249 return NULL;250 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_SG)251 return snd_trident_alloc_sg_pages(trident, substream);252 else253 return snd_trident_alloc_cont_pages(trident, substream);254}255 256 257/*258 * release DMA buffer from page table259 */260int snd_trident_free_pages(struct snd_trident *trident,261 struct snd_util_memblk *blk)262{263 struct snd_util_memhdr *hdr;264 int page;265 266 if (snd_BUG_ON(!trident || !blk))267 return -EINVAL;268 269 hdr = trident->tlb.memhdr;270 mutex_lock(&hdr->block_mutex);271 /* reset TLB entries */272 for (page = firstpg(blk); page <= lastpg(blk); page++)273 set_silent_tlb(trident, page);274 /* free memory block */275 __snd_util_mem_free(hdr, blk);276 mutex_unlock(&hdr->block_mutex);277 return 0;278}279