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ARM: PL08x: remove circular buffer support

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The driver already won't initialize a channel with a circular buffer;
the check in pl08x_prep_channel_resources() sees to that.  Remove
circular buffer support for the time being.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Russell King - ARM Linux 2011-01-03 22:34:48 +00:00 committed by Dan Williams
parent ad0a3ad33c
commit b58b6b5bed
1 changed files with 21 additions and 52 deletions
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73
drivers/dma/amba-pl08x.c
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@ -927,39 +927,21 @@ static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x,
__func__, (u32) MAX_NUM_TSFR_LLIS);
return 0;
}
/*
* Decide whether this is a loop or a terminated transfer
*/
llis_va = txd->llis_va;
llis_bus = (struct lli *) txd->llis_bus;
if (cd->circular_buffer) {
/*
* Loop the circular buffer so that the next element
* points back to the beginning of the LLI.
*/
llis_va[num_llis - 1].next =
(dma_addr_t)((unsigned int)&(llis_bus[0]));
} else {
/*
* On non-circular buffers, the final LLI terminates
* the LLI.
*/
llis_va[num_llis - 1].next = 0;
/*
* The final LLI element shall also fire an interrupt
*/
llis_va[num_llis - 1].cctl |= PL080_CONTROL_TC_IRQ_EN;
}
llis_va = txd->llis_va;
/*
* The final LLI terminates the LLI.
*/
llis_va[num_llis - 1].next = 0;
/*
* The final LLI element shall also fire an interrupt
*/
llis_va[num_llis - 1].cctl |= PL080_CONTROL_TC_IRQ_EN;
/* Now store the channel register values */
txd->csrc = llis_va[0].src;
txd->cdst = llis_va[0].dst;
if (num_llis > 1)
txd->clli = llis_va[0].next;
else
txd->clli = 0;
txd->clli = llis_va[0].next;
txd->cctl = llis_va[0].cctl;
/* ccfg will be set at physical channel allocation time */
@ -1334,19 +1316,7 @@ static int pl08x_prep_channel_resources(struct pl08x_dma_chan *plchan,
spin_lock_irqsave(&plchan->lock, plchan->lockflags);
/*
* If this device is not using a circular buffer then
* queue this new descriptor for transfer.
* The descriptor for a circular buffer continues
* to be used until the channel is freed.
*/
if (txd->cd->circular_buffer)
dev_err(&pl08x->adev->dev,
"%s attempting to queue a circular buffer\n",
__func__);
else
list_add_tail(&txd->node,
&plchan->desc_list);
list_add_tail(&txd->node, &plchan->desc_list);
/*
* See if we already have a physical channel allocated,
@ -1643,18 +1613,10 @@ static void pl08x_tasklet(unsigned long data)
callback(callback_param);
/*
* Free the descriptor if it's not for a device
* using a circular buffer
*/
if (!plchan->at->cd->circular_buffer) {
pl08x_free_txd(pl08x, plchan->at);
plchan->at = NULL;
}
/*
* else descriptor for circular
* buffers only freed when
* client has disabled dma
* Free the descriptor
*/
pl08x_free_txd(pl08x, plchan->at);
plchan->at = NULL;
}
/*
* If a new descriptor is queued, set it up
@ -1799,6 +1761,13 @@ static int pl08x_dma_init_virtual_channels(struct pl08x_driver_data *pl08x,
return -ENOMEM;
}
}
if (chan->cd->circular_buffer) {
dev_err(&pl08x->adev->dev,
"channel %s: circular buffers not supported\n",
chan->name);
kfree(chan);
continue;
}
dev_info(&pl08x->adev->dev,
"initialize virtual channel \"%s\"\n",
chan->name);