// SPDX-License-Identifier: GPL-2.0-or-later /* * Copyright (c) by Jaroslav Kysela <[email protected]> * Copyright (c) by Takashi Iwai <[email protected]> * Copyright (c) by Scott McNab <[email protected]> * * Trident 4DWave-NX memory page allocation (TLB area) * Trident chip can handle only 16MByte of the memory at the same time. */ #include <linux/io.h> #include <linux/pci.h> #include <linux/time.h> #include <linux/mutex.h> #include <sound/core.h> #include "trident.h" /* page arguments of these two macros are Trident page (4096 bytes), not like * aligned pages in others */ #define __set_tlb_bus(trident,page,addr) … #define __tlb_to_addr(trident,page) … #if PAGE_SIZE == 4096 /* page size == SNDRV_TRIDENT_PAGE_SIZE */ #define ALIGN_PAGE_SIZE … #define MAX_ALIGN_PAGES … /* fill TLB entrie(s) corresponding to page with ptr */ #define set_tlb_bus(trident,page,addr) … /* fill TLB entrie(s) corresponding to page with silence pointer */ #define set_silent_tlb(trident,page) … /* get aligned page from offset address */ #define get_aligned_page(offset) … /* get offset address from aligned page */ #define aligned_page_offset(page) … /* get PCI physical address from aligned page */ #define page_to_addr(trident,page) … #elif PAGE_SIZE == 8192 /* page size == SNDRV_TRIDENT_PAGE_SIZE x 2*/ #define ALIGN_PAGE_SIZE … #define MAX_ALIGN_PAGES … #define get_aligned_page … #define aligned_page_offset … #define page_to_addr … /* fill TLB entries -- we need to fill two entries */ static inline void set_tlb_bus(struct snd_trident *trident, int page, dma_addr_t addr) { page <<= 1; __set_tlb_bus(trident, page, addr); __set_tlb_bus(trident, page+1, addr + SNDRV_TRIDENT_PAGE_SIZE); } static inline void set_silent_tlb(struct snd_trident *trident, int page) { page <<= 1; __set_tlb_bus(trident, page, trident->tlb.silent_page->addr); __set_tlb_bus(trident, page+1, trident->tlb.silent_page->addr); } #else /* arbitrary size */ #define UNIT_PAGES … #define ALIGN_PAGE_SIZE … #define MAX_ALIGN_PAGES … /* Note: if alignment doesn't match to the maximum size, the last few blocks * become unusable. To use such blocks, you'll need to check the validity * of accessing page in set_tlb_bus and set_silent_tlb. search_empty() * should also check it, too. */ #define get_aligned_page … #define aligned_page_offset … #define page_to_addr … /* fill TLB entries -- UNIT_PAGES entries must be filled */ static inline void set_tlb_bus(struct snd_trident *trident, int page, dma_addr_t addr) { int i; page *= UNIT_PAGES; for (i = 0; i < UNIT_PAGES; i++, page++) { __set_tlb_bus(trident, page, addr); addr += SNDRV_TRIDENT_PAGE_SIZE; } } static inline void set_silent_tlb(struct snd_trident *trident, int page) { int i; page *= UNIT_PAGES; for (i = 0; i < UNIT_PAGES; i++, page++) __set_tlb_bus(trident, page, trident->tlb.silent_page->addr); } #endif /* PAGE_SIZE */ /* first and last (aligned) pages of memory block */ #define firstpg(blk) … #define lastpg(blk) … /* * search empty pages which may contain given size */ static struct snd_util_memblk * search_empty(struct snd_util_memhdr *hdr, int size) { … } /* * check if the given pointer is valid for pages */ static int is_valid_page(unsigned long ptr) { … } /* * page allocation for DMA (Scatter-Gather version) */ static struct snd_util_memblk * snd_trident_alloc_sg_pages(struct snd_trident *trident, struct snd_pcm_substream *substream) { … } /* * page allocation for DMA (contiguous version) */ static struct snd_util_memblk * snd_trident_alloc_cont_pages(struct snd_trident *trident, struct snd_pcm_substream *substream) { … } /* * page allocation for DMA */ struct snd_util_memblk * snd_trident_alloc_pages(struct snd_trident *trident, struct snd_pcm_substream *substream) { … } /* * release DMA buffer from page table */ int snd_trident_free_pages(struct snd_trident *trident, struct snd_util_memblk *blk) { … }
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