315 lines
6.4 KiB
C
315 lines
6.4 KiB
C
/*
|
|
* driver/dma/coh901318_lli.c
|
|
*
|
|
* Copyright (C) 2007-2009 ST-Ericsson
|
|
* License terms: GNU General Public License (GPL) version 2
|
|
* Support functions for handling lli for dma
|
|
* Author: Per Friden <per.friden@stericsson.com>
|
|
*/
|
|
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/dmapool.h>
|
|
#include <linux/memory.h>
|
|
#include <linux/gfp.h>
|
|
#include <mach/coh901318.h>
|
|
|
|
#include "coh901318_lli.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)
|
|
goto err;
|
|
|
|
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 = 0x00000000U;
|
|
|
|
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 = 0x00000000U;
|
|
|
|
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_data_direction dir)
|
|
{
|
|
int s = size;
|
|
dma_addr_t src;
|
|
dma_addr_t dst;
|
|
|
|
|
|
if (dir == DMA_TO_DEVICE) {
|
|
src = buf;
|
|
dst = dev_addr;
|
|
|
|
} else if (dir == DMA_FROM_DEVICE) {
|
|
|
|
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_TO_DEVICE)
|
|
src += block_size;
|
|
else if (dir == DMA_FROM_DEVICE)
|
|
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_data_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_TO_DEVICE)
|
|
dst = dev_addr;
|
|
else if (dir == DMA_FROM_DEVICE)
|
|
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_TO_DEVICE)
|
|
/* increment source address */
|
|
src = sg_phys(sg);
|
|
else
|
|
/* increment destination address */
|
|
dst = sg_phys(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_FROM_DEVICE)
|
|
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;
|
|
}
|