linux-kernel - [PATCH v7 5/9] crypto: qce: core: Add support to initialize interconnect path

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Message-Id: <20220920114051.1116441-6-bhupesh.sharma@linaro.org>
Date:   Tue, 20 Sep 2022 17:10:47 +0530
From:   Bhupesh Sharma <bhupesh.sharma@...aro.org>
To:     linux-crypto@...r.kernel.org, devicetree@...r.kernel.org
Cc:     agross@...nel.org, herbert@...dor.apana.org.au,
        linux-kernel@...r.kernel.org, robh+dt@...nel.org,
        linux-arm-msm@...r.kernel.org, thara.gopinath@...il.com,
        robh@...nel.org, krzysztof.kozlowski@...aro.org,
        andersson@...nel.org, bhupesh.sharma@...aro.org,
        bhupesh.linux@...il.com, davem@...emloft.net,
        Jordan Crouse <jorcrous@...zon.com>
Subject: [PATCH v7 5/9] crypto: qce: core: Add support to initialize interconnect path

From: Thara Gopinath <thara.gopinath@...il.com>

Crypto engine on certain Snapdragon processors like sm8150, sm8250, sm8350
etc. requires interconnect path between the engine and memory to be
explicitly enabled and bandwidth set prior to any operations. Add support
in the qce core to enable the interconnect path appropriately.

Cc: Bjorn Andersson <andersson@...nel.org>
Cc: Rob Herring <robh@...nel.org>
Cc: herbert@...dor.apana.org.au
Tested-by: Jordan Crouse <jorcrous@...zon.com>
Signed-off-by: Thara Gopinath <thara.gopinath@...il.com>
Signed-off-by: Bhupesh Sharma <bhupesh.sharma@...aro.org>
[Bhupesh: Make header file inclusion alphabetical and use devm_of_icc_get()]
---
 drivers/crypto/qce/core.c | 16 +++++++++++++++-
 drivers/crypto/qce/core.h |  1 +
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/crypto/qce/core.c b/drivers/crypto/qce/core.c
index d3780be44a76..63be06df5519 100644
--- a/drivers/crypto/qce/core.c
+++ b/drivers/crypto/qce/core.c
@@ -5,6 +5,7 @@
 
 #include <linux/clk.h>
 #include <linux/dma-mapping.h>
+#include <linux/interconnect.h>
 #include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/mod_devicetable.h>
@@ -22,6 +23,8 @@
 #define QCE_MAJOR_VERSION5	0x05
 #define QCE_QUEUE_LENGTH	1
 
+#define QCE_DEFAULT_MEM_BANDWIDTH	393600
+
 static const struct qce_algo_ops *qce_ops[] = {
 #ifdef CONFIG_CRYPTO_DEV_QCE_SKCIPHER
 	&skcipher_ops,
@@ -206,6 +209,10 @@ static int qce_crypto_probe(struct platform_device *pdev)
 	if (ret < 0)
 		return ret;
 
+	qce->mem_path = devm_of_icc_get(qce->dev, "memory");
+	if (IS_ERR(qce->mem_path))
+		return PTR_ERR(qce->mem_path);
+
 	qce->core = devm_clk_get(qce->dev, "core");
 	if (IS_ERR(qce->core))
 		return PTR_ERR(qce->core);
@@ -218,10 +225,14 @@ static int qce_crypto_probe(struct platform_device *pdev)
 	if (IS_ERR(qce->bus))
 		return PTR_ERR(qce->bus);
 
-	ret = clk_prepare_enable(qce->core);
+	ret = icc_set_bw(qce->mem_path, QCE_DEFAULT_MEM_BANDWIDTH, QCE_DEFAULT_MEM_BANDWIDTH);
 	if (ret)
 		return ret;
 
+	ret = clk_prepare_enable(qce->core);
+	if (ret)
+		goto err_mem_path_disable;
+
 	ret = clk_prepare_enable(qce->iface);
 	if (ret)
 		goto err_clks_core;
@@ -260,6 +271,9 @@ static int qce_crypto_probe(struct platform_device *pdev)
 	clk_disable_unprepare(qce->iface);
 err_clks_core:
 	clk_disable_unprepare(qce->core);
+err_mem_path_disable:
+	icc_set_bw(qce->mem_path, 0, 0);
+
 	return ret;
 }
 
diff --git a/drivers/crypto/qce/core.h b/drivers/crypto/qce/core.h
index 085774cdf641..228fcd69ec51 100644
--- a/drivers/crypto/qce/core.h
+++ b/drivers/crypto/qce/core.h
@@ -35,6 +35,7 @@ struct qce_device {
 	void __iomem *base;
 	struct device *dev;
 	struct clk *core, *iface, *bus;
+	struct icc_path *mem_path;
 	struct qce_dma_data dma;
 	int burst_size;
 	unsigned int pipe_pair_id;
-- 
2.37.1