linux-kernel - [PATCH v9 02/11] dmaengine: qcom: bam_dma: Add bam_pipe

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Message-Id: <20251128-qcom-qce-cmd-descr-v9-2-9a5f72b89722@linaro.org>
Date: Fri, 28 Nov 2025 12:44:00 +0100
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Vinod Koul <vkoul@...nel.org>, Jonathan Corbet <corbet@....net>, 
 Thara Gopinath <thara.gopinath@...il.com>, 
 Herbert Xu <herbert@...dor.apana.org.au>, 
 "David S. Miller" <davem@...emloft.net>, 
 Udit Tiwari <quic_utiwari@...cinc.com>, 
 Daniel Perez-Zoghbi <dperezzo@...cinc.com>, 
 Md Sadre Alam <mdalam@....qualcomm.com>, 
 Dmitry Baryshkov <lumag@...nel.org>
Cc: dmaengine@...r.kernel.org, linux-doc@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org, 
 linux-crypto@...r.kernel.org, 
 Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH v9 02/11] 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.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
 drivers/dma/qcom/bam_dma.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/dma/qcom/bam_dma.c b/drivers/dma/qcom/bam_dma.c
index 8861245314b1d13c1abb78f474fd0749fea52f06..c9ae1fffe44d79c5eb59b8bbf7f147a8fa3aa0bd 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 */

-- 
2.51.0