linux-kernel - [PATCH V6 02/10] remoteproc: qcom: Add secure PIL support

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Date:   Fri,  3 Jul 2020 14:32:44 +0530
From:   Gokul Sriram Palanisamy <gokulsri@...eaurora.org>
To:     gokulsri@...eaurora.org, sboyd@...nel.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, ohad@...ery.com,
        robh+dt@...nel.org, sricharan@...eaurora.org,
        nprakash@...eaurora.org
Subject: [PATCH V6 02/10] remoteproc: qcom: Add secure PIL support

IPQ8074 uses secure PIL. Hence, adding the support for the same.

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 | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/drivers/remoteproc/qcom_q6v5_wcss.c b/drivers/remoteproc/qcom_q6v5_wcss.c
index 9e9d702..7fd494f 100644
--- a/drivers/remoteproc/qcom_q6v5_wcss.c
+++ b/drivers/remoteproc/qcom_q6v5_wcss.c
@@ -19,6 +19,7 @@
 #include <linux/regulator/consumer.h>
 #include <linux/reset.h>
 #include <linux/soc/qcom/mdt_loader.h>
+#include <linux/qcom_scm.h>
 #include "qcom_common.h"
 #include "qcom_q6v5.h"
 
@@ -86,6 +87,9 @@
 #define TCSR_WCSS_CLK_ENABLE	0x14
 
 #define MAX_HALT_REG		3
+
+#define WCNSS_PAS_ID		6
+
 enum {
 	WCSS_IPQ8074,
 	WCSS_QCS404,
@@ -134,6 +138,7 @@ struct q6v5_wcss {
 	int crash_reason_smem;
 	u32 version;
 	bool requires_force_stop;
+	bool need_mem_protection;
 
 	struct qcom_rproc_glink glink_subdev;
 	struct qcom_rproc_ssr ssr_subdev;
@@ -152,6 +157,7 @@ struct wcss_data {
 	int ssctl_id;
 	const struct rproc_ops *ops;
 	bool requires_force_stop;
+	bool need_mem_protection;
 };
 
 static int q6v5_wcss_reset(struct q6v5_wcss *wcss)
@@ -251,6 +257,15 @@ static int q6v5_wcss_start(struct rproc *rproc)
 
 	qcom_q6v5_prepare(&wcss->q6v5);
 
+	if (wcss->need_mem_protection) {
+		ret = qcom_scm_pas_auth_and_reset(WCNSS_PAS_ID);
+		if (ret) {
+			dev_err(wcss->dev, "wcss_reset failed\n");
+			return ret;
+		}
+		goto wait_for_reset;
+	}
+
 	/* Release Q6 and WCSS reset */
 	ret = reset_control_deassert(wcss->wcss_reset);
 	if (ret) {
@@ -285,6 +300,7 @@ static int q6v5_wcss_start(struct rproc *rproc)
 	if (ret)
 		goto wcss_q6_reset;
 
+wait_for_reset:
 	ret = qcom_q6v5_wait_for_start(&wcss->q6v5, 5 * HZ);
 	if (ret == -ETIMEDOUT)
 		dev_err(wcss->dev, "start timed out\n");
@@ -717,6 +733,15 @@ static int q6v5_wcss_stop(struct rproc *rproc)
 	struct q6v5_wcss *wcss = rproc->priv;
 	int ret;
 
+	if (wcss->need_mem_protection) {
+		ret = qcom_scm_pas_shutdown(WCNSS_PAS_ID);
+		if (ret) {
+			dev_err(wcss->dev, "not able to shutdown\n");
+			return ret;
+		}
+		goto pas_done;
+	}
+
 	/* WCSS powerdown */
 	if (wcss->requires_force_stop) {
 		ret = qcom_q6v5_request_stop(&wcss->q6v5);
@@ -741,6 +766,7 @@ static int q6v5_wcss_stop(struct rproc *rproc)
 			return ret;
 	}
 
+pas_done:
 	clk_disable_unprepare(wcss->prng_clk);
 	qcom_q6v5_unprepare(&wcss->q6v5);
 
@@ -763,6 +789,12 @@ static int q6v5_wcss_load(struct rproc *rproc, const struct firmware *fw)
 {
 	struct q6v5_wcss *wcss = rproc->priv;
 
+	if (wcss->need_mem_protection)
+		return qcom_mdt_load(wcss->dev, fw, rproc->firmware,
+				     WCNSS_PAS_ID, wcss->mem_region,
+				     wcss->mem_phys, wcss->mem_size,
+				     &wcss->mem_reloc);
+
 	return qcom_mdt_load_no_init(wcss->dev, fw, rproc->firmware,
 				     0, wcss->mem_region, wcss->mem_phys,
 				     wcss->mem_size, &wcss->mem_reloc);
@@ -1025,6 +1057,9 @@ static int q6v5_wcss_probe(struct platform_device *pdev)
 	if (!desc)
 		return -EINVAL;
 
+	if (desc->need_mem_protection && !qcom_scm_is_available())
+		return -EPROBE_DEFER;
+
 	rproc = rproc_alloc(&pdev->dev, pdev->name, desc->ops,
 			    desc->firmware_name, sizeof(*wcss));
 	if (!rproc) {
@@ -1038,6 +1073,7 @@ static int q6v5_wcss_probe(struct platform_device *pdev)
 
 	wcss->version = desc->version;
 	wcss->requires_force_stop = desc->requires_force_stop;
+	wcss->need_mem_protection = desc->need_mem_protection;
 
 	ret = q6v5_wcss_init_mmio(wcss, pdev);
 	if (ret)
@@ -1106,6 +1142,7 @@ static const struct wcss_data wcss_ipq8074_res_init = {
 	.wcss_q6_reset_required = true,
 	.ops = &q6v5_wcss_ipq8074_ops,
 	.requires_force_stop = true,
+	.need_mem_protection = true,
 };
 
 static const struct wcss_data wcss_qcs404_res_init = {
-- 
2.7.4