[PATCH v2 1/3] crypto: atmel-aes - Retire dma_request_slave_channel_compat()

From: Peter Ujfalusi
Date: Thu Nov 21 2019 - 05:16:23 EST


The driver no longer boots in legacy mode, only via DT. This makes the
dma_request_slave_channel_compat() redundant.
If ever the filter function would be executed it will return false as the
dma_slave is not really initialized.

Switch to use dma_request_chan() which would allow legacy boot if ever
needed again by configuring dma_slave_map for the DMA driver.

At the same time skip allocating memory for dma_slave as it is not used
anymore.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@xxxxxx>
---
drivers/crypto/atmel-aes.c | 50 ++++++++------------------------------
1 file changed, 10 insertions(+), 40 deletions(-)

diff --git a/drivers/crypto/atmel-aes.c b/drivers/crypto/atmel-aes.c
index 3c88c164c3dc..30c41598fa2a 100644
--- a/drivers/crypto/atmel-aes.c
+++ b/drivers/crypto/atmel-aes.c
@@ -38,7 +38,6 @@
#include <crypto/internal/aead.h>
#include <crypto/internal/skcipher.h>
#include <linux/platform_data/crypto-atmel.h>
-#include <dt-bindings/dma/at91.h>
#include "atmel-aes-regs.h"
#include "atmel-authenc.h"

@@ -2364,39 +2363,23 @@ static void atmel_aes_buff_cleanup(struct atmel_aes_dev *dd)
free_page((unsigned long)dd->buf);
}

-static bool atmel_aes_filter(struct dma_chan *chan, void *slave)
-{
- struct at_dma_slave *sl = slave;
-
- if (sl && sl->dma_dev == chan->device->dev) {
- chan->private = sl;
- return true;
- } else {
- return false;
- }
-}
-
static int atmel_aes_dma_init(struct atmel_aes_dev *dd,
struct crypto_platform_data *pdata)
{
- struct at_dma_slave *slave;
- dma_cap_mask_t mask;
-
- dma_cap_zero(mask);
- dma_cap_set(DMA_SLAVE, mask);
+ int ret;

/* Try to grab 2 DMA channels */
- slave = &pdata->dma_slave->rxdata;
- dd->src.chan = dma_request_slave_channel_compat(mask, atmel_aes_filter,
- slave, dd->dev, "tx");
- if (!dd->src.chan)
+ dd->src.chan = dma_request_chan(dd->dev, "tx");
+ if (IS_ERR(dd->src.chan)) {
+ ret = PTR_ERR(dd->src.chan);
goto err_dma_in;
+ }

- slave = &pdata->dma_slave->txdata;
- dd->dst.chan = dma_request_slave_channel_compat(mask, atmel_aes_filter,
- slave, dd->dev, "rx");
- if (!dd->dst.chan)
+ dd->dst.chan = dma_request_chan(dd->dev, "rx");
+ if (IS_ERR(dd->dst.chan)) {
+ ret = PTR_ERR(dd->dst.chan);
goto err_dma_out;
+ }

return 0;

@@ -2404,7 +2387,7 @@ static int atmel_aes_dma_init(struct atmel_aes_dev *dd,
dma_release_channel(dd->src.chan);
err_dma_in:
dev_warn(dd->dev, "no DMA channel available\n");
- return -ENODEV;
+ return ret;
}

static void atmel_aes_dma_cleanup(struct atmel_aes_dev *dd)
@@ -2592,14 +2575,6 @@ static struct crypto_platform_data *atmel_aes_of_init(struct platform_device *pd
if (!pdata)
return ERR_PTR(-ENOMEM);

- pdata->dma_slave = devm_kzalloc(&pdev->dev,
- sizeof(*(pdata->dma_slave)),
- GFP_KERNEL);
- if (!pdata->dma_slave) {
- devm_kfree(&pdev->dev, pdata);
- return ERR_PTR(-ENOMEM);
- }
-
return pdata;
}
#else
@@ -2626,11 +2601,6 @@ static int atmel_aes_probe(struct platform_device *pdev)
}
}

- if (!pdata->dma_slave) {
- err = -ENXIO;
- goto aes_dd_err;
- }
-
aes_dd = devm_kzalloc(&pdev->dev, sizeof(*aes_dd), GFP_KERNEL);
if (aes_dd == NULL) {
err = -ENOMEM;
--
Peter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
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