linux-kernel - [PATCH v7 1/9] remoteproc: qcom: Add PRNG proxy clock

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Message-Id: <1596112003-31663-2-git-send-email-gokulsri@codeaurora.org>
Date:   Thu, 30 Jul 2020 17:56:35 +0530
From:   Gokul Sriram Palanisamy <gokulsri@...eaurora.org>
To:     gokulsri@...eaurora.org, agross@...nel.org,
        bjorn.andersson@...aro.org, david.brown@...aro.org,
        devicetree@...r.kernel.org, jassisinghbrar@...il.com,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-remoteproc@...r.kernel.org,
        mark.rutland@....com, mturquette@...libre.com,
        nprakash@...eaurora.org, ohad@...ery.com, robh+dt@...nel.org,
        sboyd@...nel.org, sricharan@...eaurora.org
Subject: [PATCH v7 1/9] remoteproc: qcom: Add PRNG proxy clock

PRNG clock is needed by the secure PIL, support for the same
is added in subsequent patches.

Signed-off-by: Gokul Sriram Palanisamy <gokulsri@...eaurora.org>
Signed-off-by: Sricharan R <sricharan@...eaurora.org>
Signed-off-by: Nikhil Prakash V <nprakash@...eaurora.org>
---
 drivers/remoteproc/qcom_q6v5_wcss.c | 65 +++++++++++++++++++++++++++----------
 1 file changed, 47 insertions(+), 18 deletions(-)

diff --git a/drivers/remoteproc/qcom_q6v5_wcss.c b/drivers/remoteproc/qcom_q6v5_wcss.c
index efb16a4..e13d1c6 100644
--- a/drivers/remoteproc/qcom_q6v5_wcss.c
+++ b/drivers/remoteproc/qcom_q6v5_wcss.c
@@ -91,19 +91,6 @@ enum {
 	WCSS_QCS404,
 };
 
-struct wcss_data {
-	const char *firmware_name;
-	unsigned int crash_reason_smem;
-	u32 version;
-	bool aon_reset_required;
-	bool wcss_q6_reset_required;
-	const char *ssr_name;
-	const char *sysmon_name;
-	int ssctl_id;
-	const struct rproc_ops *ops;
-	bool requires_force_stop;
-};
-
 struct q6v5_wcss {
 	struct device *dev;
 
@@ -128,6 +115,7 @@ struct q6v5_wcss {
 	struct clk *qdsp6ss_xo_cbcr;
 	struct clk *qdsp6ss_core_gfmux;
 	struct clk *lcc_bcr_sleep;
+	struct clk *prng_clk;
 	struct regulator *cx_supply;
 	struct qcom_sysmon *sysmon;
 
@@ -151,6 +139,21 @@ struct q6v5_wcss {
 	struct qcom_rproc_ssr ssr_subdev;
 };
 
+struct wcss_data {
+	int (*init_clock)(struct q6v5_wcss *wcss);
+	int (*init_regulator)(struct q6v5_wcss *wcss);
+	const char *firmware_name;
+	unsigned int crash_reason_smem;
+	u32 version;
+	bool aon_reset_required;
+	bool wcss_q6_reset_required;
+	const char *ssr_name;
+	const char *sysmon_name;
+	int ssctl_id;
+	const struct rproc_ops *ops;
+	bool requires_force_stop;
+};
+
 static int q6v5_wcss_reset(struct q6v5_wcss *wcss)
 {
 	int ret;
@@ -240,6 +243,12 @@ static int q6v5_wcss_start(struct rproc *rproc)
 	struct q6v5_wcss *wcss = rproc->priv;
 	int ret;
 
+	ret = clk_prepare_enable(wcss->prng_clk);
+	if (ret) {
+		dev_err(wcss->dev, "prng clock enable failed\n");
+		return ret;
+	}
+
 	qcom_q6v5_prepare(&wcss->q6v5);
 
 	/* Release Q6 and WCSS reset */
@@ -732,6 +741,7 @@ static int q6v5_wcss_stop(struct rproc *rproc)
 			return ret;
 	}
 
+	clk_disable_unprepare(wcss->prng_clk);
 	qcom_q6v5_unprepare(&wcss->q6v5);
 
 	return 0;
@@ -896,7 +906,21 @@ static int q6v5_alloc_memory_region(struct q6v5_wcss *wcss)
 	return 0;
 }
 
-static int q6v5_wcss_init_clock(struct q6v5_wcss *wcss)
+static int ipq8074_init_clock(struct q6v5_wcss *wcss)
+{
+	int ret;
+
+	wcss->prng_clk = devm_clk_get(wcss->dev, "prng");
+	if (IS_ERR(wcss->prng_clk)) {
+		ret = PTR_ERR(wcss->prng_clk);
+		if (ret != -EPROBE_DEFER)
+			dev_err(wcss->dev, "Failed to get prng clock\n");
+		return ret;
+	}
+	return 0;
+}
+
+static int qcs404_init_clock(struct q6v5_wcss *wcss)
 {
 	int ret;
 
@@ -986,7 +1010,7 @@ static int q6v5_wcss_init_clock(struct q6v5_wcss *wcss)
 	return 0;
 }
 
-static int q6v5_wcss_init_regulator(struct q6v5_wcss *wcss)
+static int qcs404_init_regulator(struct q6v5_wcss *wcss)
 {
 	wcss->cx_supply = devm_regulator_get(wcss->dev, "cx");
 	if (IS_ERR(wcss->cx_supply))
@@ -1030,12 +1054,14 @@ static int q6v5_wcss_probe(struct platform_device *pdev)
 	if (ret)
 		goto free_rproc;
 
-	if (wcss->version == WCSS_QCS404) {
-		ret = q6v5_wcss_init_clock(wcss);
+	if (desc->init_clock) {
+		ret = desc->init_clock(wcss);
 		if (ret)
 			goto free_rproc;
+	}
 
-		ret = q6v5_wcss_init_regulator(wcss);
+	if (desc->init_regulator) {
+		ret = desc->init_regulator(wcss);
 		if (ret)
 			goto free_rproc;
 	}
@@ -1080,6 +1106,7 @@ static int q6v5_wcss_remove(struct platform_device *pdev)
 }
 
 static const struct wcss_data wcss_ipq8074_res_init = {
+	.init_clock = ipq8074_init_clock,
 	.firmware_name = "IPQ8074/q6_fw.mdt",
 	.crash_reason_smem = WCSS_CRASH_REASON,
 	.aon_reset_required = true,
@@ -1089,6 +1116,8 @@ static const struct wcss_data wcss_ipq8074_res_init = {
 };
 
 static const struct wcss_data wcss_qcs404_res_init = {
+	.init_clock = qcs404_init_clock,
+	.init_regulator = qcs404_init_regulator,
 	.crash_reason_smem = WCSS_CRASH_REASON,
 	.firmware_name = "wcnss.mdt",
 	.version = WCSS_QCS404,
-- 
2.7.4