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Commit b87108a7 authored by Linus Walleij's avatar Linus Walleij Committed by Dan Williams
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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: default avatarLinus Walleij <linus.walleij@stericsson.com>
Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
parent 848ad121

arch/arm/mach-u300/include/mach/coh901318.h

+1 −1
Original line number Diff line number Diff line
@@ -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

drivers/dma/coh901318.c

+25 −29
Original line number Diff line number Diff line
@@ -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(

	ret = coh901318_lli_fill_memcpy(

		&cohc->base->pool, data, src, size, dest,

		cohc_chan_param(cohc)->ctrl_lli_chained,

		ctrl_last);

	cohd->flags = flags;

	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;