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Date: Tue, 2 Mar 2010 21:12:26 +0100
From: Linus Walleij <linus.walleij@...ricsson.com>
To: Dan Williams <dan.j.williams@...el.com>,
linux-kernel@...r.kernel.org
Cc: Linus Walleij <linus.walleij@...ricsson.com>
Subject: [PATCH 2/5] DMAENGINE: COH 901 318 descriptor pool refactoring
This centralize some spread-out initialization of descriptors into
one function and cleans up the error paths.
Signed-off-by: Linus Walleij <linus.walleij@...ricsson.com>
---
arch/arm/mach-u300/include/mach/coh901318.h | 2 +-
drivers/dma/coh901318.c | 54 ++++++++++++--------------
2 files changed, 26 insertions(+), 30 deletions(-)
diff --git a/arch/arm/mach-u300/include/mach/coh901318.h b/arch/arm/mach-u300/include/mach/coh901318.h
index f4cfee9..b8155b4 100644
--- a/arch/arm/mach-u300/include/mach/coh901318.h
+++ b/arch/arm/mach-u300/include/mach/coh901318.h
@@ -53,7 +53,7 @@ struct coh901318_params {
* struct coh_dma_channel - dma channel base
* @name: ascii name of dma channel
* @number: channel id number
- * @desc_nbr_max: number of preallocated descriptortors
+ * @desc_nbr_max: number of preallocated descriptors
* @priority_high: prio of channel, 0 low otherwise high.
* @param: configuration parameters
* @dev_addr: physical address of periphal connected to channel
diff --git a/drivers/dma/coh901318.c b/drivers/dma/coh901318.c
index b962cf1..00398ca 100644
--- a/drivers/dma/coh901318.c
+++ b/drivers/dma/coh901318.c
@@ -335,16 +335,22 @@ coh901318_desc_get(struct coh901318_chan *cohc)
* TODO: alloc a pile of descs instead of just one,
* avoid many small allocations.
*/
- desc = kmalloc(sizeof(struct coh901318_desc), GFP_NOWAIT);
+ desc = kzalloc(sizeof(struct coh901318_desc), GFP_NOWAIT);
if (desc == NULL)
goto out;
INIT_LIST_HEAD(&desc->node);
+ dma_async_tx_descriptor_init(&desc->desc, &cohc->chan);
} else {
/* Reuse an old desc. */
desc = list_first_entry(&cohc->free,
struct coh901318_desc,
node);
list_del(&desc->node);
+ /* Initialize it a bit so it's not insane */
+ desc->sg = NULL;
+ desc->sg_len = 0;
+ desc->desc.callback = NULL;
+ desc->desc.callback_param = NULL;
}
out:
@@ -885,6 +891,7 @@ coh901318_prep_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
struct coh901318_chan *cohc = to_coh901318_chan(chan);
int lli_len;
u32 ctrl_last = cohc_chan_param(cohc)->ctrl_lli_last;
+ int ret;
spin_lock_irqsave(&cohc->lock, flg);
@@ -905,22 +912,19 @@ coh901318_prep_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
if (data == NULL)
goto err;
- cohd = coh901318_desc_get(cohc);
- cohd->sg = NULL;
- cohd->sg_len = 0;
- cohd->data = data;
-
- cohd->pending_irqs =
- coh901318_lli_fill_memcpy(
- &cohc->base->pool, data, src, size, dest,
- cohc_chan_param(cohc)->ctrl_lli_chained,
- ctrl_last);
- cohd->flags = flags;
+ ret = coh901318_lli_fill_memcpy(
+ &cohc->base->pool, data, src, size, dest,
+ cohc_chan_param(cohc)->ctrl_lli_chained,
+ ctrl_last);
+ if (ret)
+ goto err;
COH_DBG(coh901318_list_print(cohc, data));
- dma_async_tx_descriptor_init(&cohd->desc, chan);
-
+ /* Pick a descriptor to handle this transfer */
+ cohd = coh901318_desc_get(cohc);
+ cohd->data = data;
+ cohd->flags = flags;
cohd->desc.tx_submit = coh901318_tx_submit;
spin_unlock_irqrestore(&cohc->lock, flg);
@@ -962,11 +966,6 @@ coh901318_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
/* Trigger interrupt after last lli */
ctrl_last |= COH901318_CX_CTRL_TC_IRQ_ENABLE;
- cohd = coh901318_desc_get(cohc);
- cohd->sg = NULL;
- cohd->sg_len = 0;
- cohd->dir = direction;
-
if (direction == DMA_TO_DEVICE) {
u32 tx_flags = COH901318_CX_CTRL_PRDD_SOURCE |
COH901318_CX_CTRL_SRC_ADDR_INC_ENABLE;
@@ -984,11 +983,6 @@ coh901318_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
} else
goto err_direction;
- dma_async_tx_descriptor_init(&cohd->desc, chan);
-
- cohd->desc.tx_submit = coh901318_tx_submit;
-
-
/* The dma only supports transmitting packages up to
* MAX_DMA_PACKET_SIZE. Calculate to total number of
* dma elemts required to send the entire sg list
@@ -1023,19 +1017,21 @@ coh901318_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
ctrl,
ctrl_last,
direction, COH901318_CX_CTRL_TC_IRQ_ENABLE);
- cohd->data = data;
-
- cohd->flags = flags;
COH_DBG(coh901318_list_print(cohc, data));
+ /* Pick a descriptor to handle this transfer */
+ cohd = coh901318_desc_get(cohc);
+ cohd->dir = direction;
+ cohd->flags = flags;
+ cohd->desc.tx_submit = coh901318_tx_submit;
+ cohd->data = data;
+
spin_unlock_irqrestore(&cohc->lock, flg);
return &cohd->desc;
err_dma_alloc:
err_direction:
- coh901318_desc_remove(cohd);
- coh901318_desc_free(cohc, cohd);
spin_unlock_irqrestore(&cohc->lock, flg);
out:
return NULL;
--
1.6.3.3
--
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