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Message-ID: <1461934938-28297-1-git-send-email-peter.ujfalusi@ti.com>
Date: Fri, 29 Apr 2016 16:02:18 +0300
From: Peter Ujfalusi <peter.ujfalusi@...com>
To: <herbert@...dor.apana.org.au>, <davem@...emloft.net>
CC: <linux-kernel@...r.kernel.org>, <linux-crypto@...r.kernel.org>,
<linux-omap@...r.kernel.org>, <t-kristo@...com>,
<lokeshvutla@...com>
Subject: [PATCH] crypto: omap-aes: Use dma_request_chan() for requesting DMA channel
With the new dma_request_chan() the client driver does not need to look for
the DMA resource and it does not need to pass filter_fn anymore.
By switching to the new API the driver can now support deferred probing
against DMA.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
CC: Herbert Xu <herbert@...dor.apana.org.au>
CC: David S. Miller <davem@...emloft.net>
CC: Lokesh Vutla <lokeshvutla@...com>
---
drivers/crypto/omap-aes.c | 62 ++++++++++++-----------------------------------
1 file changed, 16 insertions(+), 46 deletions(-)
diff --git a/drivers/crypto/omap-aes.c b/drivers/crypto/omap-aes.c
index d420ec751c7c..ce174d3b842c 100644
--- a/drivers/crypto/omap-aes.c
+++ b/drivers/crypto/omap-aes.c
@@ -26,7 +26,6 @@
#include <linux/scatterlist.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
-#include <linux/omap-dma.h>
#include <linux/pm_runtime.h>
#include <linux/of.h>
#include <linux/of_device.h>
@@ -176,9 +175,7 @@ struct omap_aes_dev {
struct scatter_walk in_walk;
struct scatter_walk out_walk;
- int dma_in;
struct dma_chan *dma_lch_in;
- int dma_out;
struct dma_chan *dma_lch_out;
int in_sg_len;
int out_sg_len;
@@ -351,30 +348,21 @@ static void omap_aes_dma_out_callback(void *data)
static int omap_aes_dma_init(struct omap_aes_dev *dd)
{
- int err = -ENOMEM;
- dma_cap_mask_t mask;
+ int err;
dd->dma_lch_out = NULL;
dd->dma_lch_in = NULL;
- dma_cap_zero(mask);
- dma_cap_set(DMA_SLAVE, mask);
-
- dd->dma_lch_in = dma_request_slave_channel_compat(mask,
- omap_dma_filter_fn,
- &dd->dma_in,
- dd->dev, "rx");
- if (!dd->dma_lch_in) {
+ dd->dma_lch_in = dma_request_chan(dd->dev, "rx");
+ if (IS_ERR(dd->dma_lch_in)) {
dev_err(dd->dev, "Unable to request in DMA channel\n");
- goto err_dma_in;
+ return PTR_ERR(dd->dma_lch_in);
}
- dd->dma_lch_out = dma_request_slave_channel_compat(mask,
- omap_dma_filter_fn,
- &dd->dma_out,
- dd->dev, "tx");
- if (!dd->dma_lch_out) {
+ dd->dma_lch_out = dma_request_chan(dd->dev, "tx");
+ if (IS_ERR(dd->dma_lch_out)) {
dev_err(dd->dev, "Unable to request out DMA channel\n");
+ err = PTR_ERR(dd->dma_lch_out);
goto err_dma_out;
}
@@ -382,14 +370,15 @@ static int omap_aes_dma_init(struct omap_aes_dev *dd)
err_dma_out:
dma_release_channel(dd->dma_lch_in);
-err_dma_in:
- if (err)
- pr_err("error: %d\n", err);
+
return err;
}
static void omap_aes_dma_cleanup(struct omap_aes_dev *dd)
{
+ if (dd->pio_only)
+ return;
+
dma_release_channel(dd->dma_lch_out);
dma_release_channel(dd->dma_lch_in);
}
@@ -1080,9 +1069,6 @@ static int omap_aes_get_res_of(struct omap_aes_dev *dd,
goto err;
}
- dd->dma_out = -1; /* Dummy value that's unused */
- dd->dma_in = -1; /* Dummy value that's unused */
-
dd->pdata = match->data;
err:
@@ -1116,24 +1102,6 @@ static int omap_aes_get_res_pdev(struct omap_aes_dev *dd,
}
memcpy(res, r, sizeof(*res));
- /* Get the DMA out channel */
- r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
- if (!r) {
- dev_err(dev, "no DMA out resource info\n");
- err = -ENODEV;
- goto err;
- }
- dd->dma_out = r->start;
-
- /* Get the DMA in channel */
- r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
- if (!r) {
- dev_err(dev, "no DMA in resource info\n");
- err = -ENODEV;
- goto err;
- }
- dd->dma_in = r->start;
-
/* Only OMAP2/3 can be non-DT */
dd->pdata = &omap_aes_pdata_omap2;
@@ -1191,7 +1159,9 @@ static int omap_aes_probe(struct platform_device *pdev)
tasklet_init(&dd->done_task, omap_aes_done_task, (unsigned long)dd);
err = omap_aes_dma_init(dd);
- if (err && AES_REG_IRQ_STATUS(dd) && AES_REG_IRQ_ENABLE(dd)) {
+ if (err == -EPROBE_DEFER) {
+ goto err_irq;
+ } else if (err && AES_REG_IRQ_STATUS(dd) && AES_REG_IRQ_ENABLE(dd)) {
dd->pio_only = 1;
irq = platform_get_irq(pdev, 0);
@@ -1248,8 +1218,8 @@ err_algs:
for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
crypto_unregister_alg(
&dd->pdata->algs_info[i].algs_list[j]);
- if (!dd->pio_only)
- omap_aes_dma_cleanup(dd);
+
+ omap_aes_dma_cleanup(dd);
err_irq:
tasklet_kill(&dd->done_task);
pm_runtime_disable(dev);
--
2.8.1
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