linux-kernel - [PATCH v7 3/8] dmaengine: qcom: bam_dma: add bam_pipe

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Message-Id: <20250311-qce-cmd-descr-v7-3-db613f5d9c9f@linaro.org>
Date: Tue, 11 Mar 2025 10:25:34 +0100
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Thara Gopinath <thara.gopinath@...il.com>, 
 Herbert Xu <herbert@...dor.apana.org.au>, 
 "David S. Miller" <davem@...emloft.net>, Vinod Koul <vkoul@...nel.org>, 
 Jonathan Corbet <corbet@....net>, Md Sadre Alam <quic_mdalam@...cinc.com>, 
 Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc: linux-crypto@...r.kernel.org, linux-arm-msm@...r.kernel.org, 
 linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org, 
 linux-doc@...r.kernel.org, 
 Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH v7 3/8] dmaengine: qcom: bam_dma: add bam_pipe_lock flag
 support

From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

Extend the device match data with a flag indicating whether the IP
supports the BAM lock/unlock feature. Set it to true on BAM IP versions
1.4.0 and above.

Co-developed-by: Md Sadre Alam <quic_mdalam@...cinc.com>
Signed-off-by: Md Sadre Alam <quic_mdalam@...cinc.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
 drivers/dma/qcom/bam_dma.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/qcom/bam_dma.c b/drivers/dma/qcom/bam_dma.c
index 8861245314b1..737fce396c2e 100644
--- a/drivers/dma/qcom/bam_dma.c
+++ b/drivers/dma/qcom/bam_dma.c
@@ -58,6 +58,8 @@ struct bam_desc_hw {
 #define DESC_FLAG_EOB BIT(13)
 #define DESC_FLAG_NWD BIT(12)
 #define DESC_FLAG_CMD BIT(11)
+#define DESC_FLAG_LOCK BIT(10)
+#define DESC_FLAG_UNLOCK BIT(9)

 struct bam_async_desc {
 	struct virt_dma_desc vd;
@@ -113,6 +115,7 @@ struct reg_offset_data {

 struct bam_device_data {
 	const struct reg_offset_data *reg_info;
+	bool bam_pipe_lock;
 };

 static const struct reg_offset_data bam_v1_3_reg_info[] = {
@@ -179,6 +182,7 @@ static const struct reg_offset_data bam_v1_4_reg_info[] = {

 static const struct bam_device_data bam_v1_4_data = {
 	.reg_info = bam_v1_4_reg_info,
+	.bam_pipe_lock = true,
 };

 static const struct reg_offset_data bam_v1_7_reg_info[] = {
@@ -212,6 +216,7 @@ static const struct reg_offset_data bam_v1_7_reg_info[] = {

 static const struct bam_device_data bam_v1_7_data = {
 	.reg_info = bam_v1_7_reg_info,
+	.bam_pipe_lock = true,
 };

 /* BAM CTRL */
@@ -707,8 +712,15 @@ static struct dma_async_tx_descriptor *bam_prep_slave_sg(struct dma_chan *chan,
 		unsigned int curr_offset = 0;

 		do {
-			if (flags & DMA_PREP_CMD)
+			if (flags & DMA_PREP_CMD) {
 				desc->flags |= cpu_to_le16(DESC_FLAG_CMD);
+				if (bdev->dev_data->bam_pipe_lock) {
+					if (flags & DMA_PREP_LOCK)
+						desc->flags |= cpu_to_le16(DESC_FLAG_LOCK);
+					else if (flags & DMA_PREP_UNLOCK)
+						desc->flags |= cpu_to_le16(DESC_FLAG_UNLOCK);
+				}
+			}

 			desc->addr = cpu_to_le32(sg_dma_address(sg) +
 						 curr_offset);

-- 
2.45.2