summaryrefslogtreecommitdiff
path: root/drivers/dma/coh901318_lli.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/dma/coh901318_lli.c')
-rw-r--r--drivers/dma/coh901318_lli.c313
1 files changed, 0 insertions, 313 deletions
diff --git a/drivers/dma/coh901318_lli.c b/drivers/dma/coh901318_lli.c
deleted file mode 100644
index 6b6c2fd0865a..000000000000
--- a/drivers/dma/coh901318_lli.c
+++ /dev/null
@@ -1,313 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * driver/dma/coh901318_lli.c
- *
- * Copyright (C) 2007-2009 ST-Ericsson
- * Support functions for handling lli for dma
- * Author: Per Friden <per.friden@stericsson.com>
- */
-
-#include <linux/spinlock.h>
-#include <linux/memory.h>
-#include <linux/gfp.h>
-#include <linux/dmapool.h>
-#include <linux/dmaengine.h>
-
-#include "coh901318.h"
-
-#if (defined(CONFIG_DEBUG_FS) && defined(CONFIG_U300_DEBUG))
-#define DEBUGFS_POOL_COUNTER_RESET(pool) (pool->debugfs_pool_counter = 0)
-#define DEBUGFS_POOL_COUNTER_ADD(pool, add) (pool->debugfs_pool_counter += add)
-#else
-#define DEBUGFS_POOL_COUNTER_RESET(pool)
-#define DEBUGFS_POOL_COUNTER_ADD(pool, add)
-#endif
-
-static struct coh901318_lli *
-coh901318_lli_next(struct coh901318_lli *data)
-{
- if (data == NULL || data->link_addr == 0)
- return NULL;
-
- return (struct coh901318_lli *) data->virt_link_addr;
-}
-
-int coh901318_pool_create(struct coh901318_pool *pool,
- struct device *dev,
- size_t size, size_t align)
-{
- spin_lock_init(&pool->lock);
- pool->dev = dev;
- pool->dmapool = dma_pool_create("lli_pool", dev, size, align, 0);
-
- DEBUGFS_POOL_COUNTER_RESET(pool);
- return 0;
-}
-
-int coh901318_pool_destroy(struct coh901318_pool *pool)
-{
-
- dma_pool_destroy(pool->dmapool);
- return 0;
-}
-
-struct coh901318_lli *
-coh901318_lli_alloc(struct coh901318_pool *pool, unsigned int len)
-{
- int i;
- struct coh901318_lli *head;
- struct coh901318_lli *lli;
- struct coh901318_lli *lli_prev;
- dma_addr_t phy;
-
- if (len == 0)
- return NULL;
-
- spin_lock(&pool->lock);
-
- head = dma_pool_alloc(pool->dmapool, GFP_NOWAIT, &phy);
-
- if (head == NULL)
- goto err;
-
- DEBUGFS_POOL_COUNTER_ADD(pool, 1);
-
- lli = head;
- lli->phy_this = phy;
- lli->link_addr = 0x00000000;
- lli->virt_link_addr = NULL;
-
- for (i = 1; i < len; i++) {
- lli_prev = lli;
-
- lli = dma_pool_alloc(pool->dmapool, GFP_NOWAIT, &phy);
-
- if (lli == NULL)
- goto err_clean_up;
-
- DEBUGFS_POOL_COUNTER_ADD(pool, 1);
- lli->phy_this = phy;
- lli->link_addr = 0x00000000;
- lli->virt_link_addr = NULL;
-
- lli_prev->link_addr = phy;
- lli_prev->virt_link_addr = lli;
- }
-
- spin_unlock(&pool->lock);
-
- return head;
-
- err:
- spin_unlock(&pool->lock);
- return NULL;
-
- err_clean_up:
- lli_prev->link_addr = 0x00000000U;
- spin_unlock(&pool->lock);
- coh901318_lli_free(pool, &head);
- return NULL;
-}
-
-void coh901318_lli_free(struct coh901318_pool *pool,
- struct coh901318_lli **lli)
-{
- struct coh901318_lli *l;
- struct coh901318_lli *next;
-
- if (lli == NULL)
- return;
-
- l = *lli;
-
- if (l == NULL)
- return;
-
- spin_lock(&pool->lock);
-
- while (l->link_addr) {
- next = l->virt_link_addr;
- dma_pool_free(pool->dmapool, l, l->phy_this);
- DEBUGFS_POOL_COUNTER_ADD(pool, -1);
- l = next;
- }
- dma_pool_free(pool->dmapool, l, l->phy_this);
- DEBUGFS_POOL_COUNTER_ADD(pool, -1);
-
- spin_unlock(&pool->lock);
- *lli = NULL;
-}
-
-int
-coh901318_lli_fill_memcpy(struct coh901318_pool *pool,
- struct coh901318_lli *lli,
- dma_addr_t source, unsigned int size,
- dma_addr_t destination, u32 ctrl_chained,
- u32 ctrl_eom)
-{
- int s = size;
- dma_addr_t src = source;
- dma_addr_t dst = destination;
-
- lli->src_addr = src;
- lli->dst_addr = dst;
-
- while (lli->link_addr) {
- lli->control = ctrl_chained | MAX_DMA_PACKET_SIZE;
- lli->src_addr = src;
- lli->dst_addr = dst;
-
- s -= MAX_DMA_PACKET_SIZE;
- lli = coh901318_lli_next(lli);
-
- src += MAX_DMA_PACKET_SIZE;
- dst += MAX_DMA_PACKET_SIZE;
- }
-
- lli->control = ctrl_eom | s;
- lli->src_addr = src;
- lli->dst_addr = dst;
-
- return 0;
-}
-
-int
-coh901318_lli_fill_single(struct coh901318_pool *pool,
- struct coh901318_lli *lli,
- dma_addr_t buf, unsigned int size,
- dma_addr_t dev_addr, u32 ctrl_chained, u32 ctrl_eom,
- enum dma_transfer_direction dir)
-{
- int s = size;
- dma_addr_t src;
- dma_addr_t dst;
-
-
- if (dir == DMA_MEM_TO_DEV) {
- src = buf;
- dst = dev_addr;
-
- } else if (dir == DMA_DEV_TO_MEM) {
-
- src = dev_addr;
- dst = buf;
- } else {
- return -EINVAL;
- }
-
- while (lli->link_addr) {
- size_t block_size = MAX_DMA_PACKET_SIZE;
- lli->control = ctrl_chained | MAX_DMA_PACKET_SIZE;
-
- /* If we are on the next-to-final block and there will
- * be less than half a DMA packet left for the last
- * block, then we want to make this block a little
- * smaller to balance the sizes. This is meant to
- * avoid too small transfers if the buffer size is
- * (MAX_DMA_PACKET_SIZE*N + 1) */
- if (s < (MAX_DMA_PACKET_SIZE + MAX_DMA_PACKET_SIZE/2))
- block_size = MAX_DMA_PACKET_SIZE/2;
-
- s -= block_size;
- lli->src_addr = src;
- lli->dst_addr = dst;
-
- lli = coh901318_lli_next(lli);
-
- if (dir == DMA_MEM_TO_DEV)
- src += block_size;
- else if (dir == DMA_DEV_TO_MEM)
- dst += block_size;
- }
-
- lli->control = ctrl_eom | s;
- lli->src_addr = src;
- lli->dst_addr = dst;
-
- return 0;
-}
-
-int
-coh901318_lli_fill_sg(struct coh901318_pool *pool,
- struct coh901318_lli *lli,
- struct scatterlist *sgl, unsigned int nents,
- dma_addr_t dev_addr, u32 ctrl_chained, u32 ctrl,
- u32 ctrl_last,
- enum dma_transfer_direction dir, u32 ctrl_irq_mask)
-{
- int i;
- struct scatterlist *sg;
- u32 ctrl_sg;
- dma_addr_t src = 0;
- dma_addr_t dst = 0;
- u32 bytes_to_transfer;
- u32 elem_size;
-
- if (lli == NULL)
- goto err;
-
- spin_lock(&pool->lock);
-
- if (dir == DMA_MEM_TO_DEV)
- dst = dev_addr;
- else if (dir == DMA_DEV_TO_MEM)
- src = dev_addr;
- else
- goto err;
-
- for_each_sg(sgl, sg, nents, i) {
- if (sg_is_chain(sg)) {
- /* sg continues to the next sg-element don't
- * send ctrl_finish until the last
- * sg-element in the chain
- */
- ctrl_sg = ctrl_chained;
- } else if (i == nents - 1)
- ctrl_sg = ctrl_last;
- else
- ctrl_sg = ctrl ? ctrl : ctrl_last;
-
-
- if (dir == DMA_MEM_TO_DEV)
- /* increment source address */
- src = sg_dma_address(sg);
- else
- /* increment destination address */
- dst = sg_dma_address(sg);
-
- bytes_to_transfer = sg_dma_len(sg);
-
- while (bytes_to_transfer) {
- u32 val;
-
- if (bytes_to_transfer > MAX_DMA_PACKET_SIZE) {
- elem_size = MAX_DMA_PACKET_SIZE;
- val = ctrl_chained;
- } else {
- elem_size = bytes_to_transfer;
- val = ctrl_sg;
- }
-
- lli->control = val | elem_size;
- lli->src_addr = src;
- lli->dst_addr = dst;
-
- if (dir == DMA_DEV_TO_MEM)
- dst += elem_size;
- else
- src += elem_size;
-
- BUG_ON(lli->link_addr & 3);
-
- bytes_to_transfer -= elem_size;
- lli = coh901318_lli_next(lli);
- }
-
- }
- spin_unlock(&pool->lock);
-
- return 0;
- err:
- spin_unlock(&pool->lock);
- return -EINVAL;
-}
generated by cgit v1.2.3 (git 2.39.0) at 2025-02-20 05:54:56 +0300