linux-kernel - [PATCH 5/8] crypto: ux500/cryp - Set DMA configuration though dma_slave

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Message-Id: <1367491790-9727-6-git-send-email-lee.jones@linaro.org>
Date:	Thu,  2 May 2013 11:49:47 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:	arnd@...db.de, linus.walleij@...ricsson.com,
	srinidhi.kasagar@...ricsson.com, Lee Jones <lee.jones@...aro.org>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>,
	Andreas Westin <andreas.westin@...ricsson.com>,
	linux-crypto@...r.kernel.org
Subject: [PATCH 5/8] crypto: ux500/cryp - Set DMA configuration though dma_slave_config()

The DMA controller currently takes configuration information from
information passed though dma_channel_request(), but it shouldn't.
Using the API, the DMA channel should only be configured during
a dma_slave_config() call.

Cc: Herbert Xu <herbert@...dor.apana.org.au>
Cc: David S. Miller <davem@...emloft.net>
Cc: Andreas Westin <andreas.westin@...ricsson.com>
Cc: linux-crypto@...r.kernel.org
Acked-by: Arnd Bergmann <arnd@...db.de>
Acked-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Lee Jones <lee.jones@...aro.org>
---
 drivers/crypto/ux500/cryp/cryp.h      |    7 ++++++-
 drivers/crypto/ux500/cryp/cryp_core.c |   17 +++++++++++++++++
 2 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/drivers/crypto/ux500/cryp/cryp.h b/drivers/crypto/ux500/cryp/cryp.h
index 14cfd05..d1d6606 100644
--- a/drivers/crypto/ux500/cryp/cryp.h
+++ b/drivers/crypto/ux500/cryp/cryp.h
@@ -114,6 +114,9 @@ enum cryp_status_id {
 };
 
 /* Cryp DMA interface */
+#define CRYP_DMA_TX_FIFO	0x08
+#define CRYP_DMA_RX_FIFO	0x10
+
 enum cryp_dma_req_type {
 	CRYP_DMA_DISABLE_BOTH,
 	CRYP_DMA_ENABLE_IN_DATA,
@@ -217,7 +220,8 @@ struct cryp_dma {
 
 /**
  * struct cryp_device_data - structure for a cryp device.
- * @base: Pointer to the hardware base address.
+ * @base: Pointer to virtual base address of the cryp device.
+ * @phybase: Pointer to physical memory location of the cryp device.
  * @dev: Pointer to the devices dev structure.
  * @clk: Pointer to the device's clock control.
  * @pwr_regulator: Pointer to the device's power control.
@@ -232,6 +236,7 @@ struct cryp_dma {
  */
 struct cryp_device_data {
 	struct cryp_register __iomem *base;
+	phys_addr_t phybase;
 	struct device *dev;
 	struct clk *clk;
 	struct regulator *pwr_regulator;
diff --git a/drivers/crypto/ux500/cryp/cryp_core.c b/drivers/crypto/ux500/cryp/cryp_core.c
index bf78d60..4b90493 100644
--- a/drivers/crypto/ux500/cryp/cryp_core.c
+++ b/drivers/crypto/ux500/cryp/cryp_core.c
@@ -476,6 +476,19 @@ static int cryp_get_device_data(struct cryp_ctx *ctx,
 static void cryp_dma_setup_channel(struct cryp_device_data *device_data,
 				   struct device *dev)
 {
+	struct dma_slave_config mem2cryp = {
+		.direction = DMA_MEM_TO_DEV,
+		.dst_addr = device_data->phybase + CRYP_DMA_TX_FIFO,
+		.dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES,
+		.dst_maxburst = 4,
+        };
+	struct dma_slave_config cryp2mem = {
+		.direction = DMA_DEV_TO_MEM,
+		.src_addr = device_data->phybase + CRYP_DMA_RX_FIFO,
+		.src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES,
+		.src_maxburst = 4,
+        };
+
 	dma_cap_zero(device_data->dma.mask);
 	dma_cap_set(DMA_SLAVE, device_data->dma.mask);
 
@@ -491,6 +504,9 @@ static void cryp_dma_setup_channel(struct cryp_device_data *device_data,
 				    stedma40_filter,
 				    device_data->dma.cfg_cryp2mem);
 
+	dmaengine_slave_config(device_data->dma.chan_mem2cryp, &mem2cryp);
+	dmaengine_slave_config(device_data->dma.chan_cryp2mem, &cryp2mem);
+
 	init_completion(&device_data->dma.cryp_dma_complete);
 }
 
@@ -1432,6 +1448,7 @@ static int ux500_cryp_probe(struct platform_device *pdev)
 		goto out_kfree;
 	}
 
+	device_data->phybase = res->start;
 	device_data->base = ioremap(res->start, resource_size(res));
 	if (!device_data->base) {
 		dev_err(dev, "[%s]: ioremap failed!", __func__);
-- 
1.7.10.4

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