linux-kernel - [PATCH v2 1/3] firmware: stratix10-svc: extend svc to support FCS features

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Date:   Mon, 14 Mar 2022 22:09:50 +0800
From:   tien.sung.ang@...el.com
To:     Dinh Nguyen <dinguyen@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Ang Tien Sung <tien.sung.ang@...el.com>
Subject: [PATCH v2 1/3] firmware: stratix10-svc: extend svc to support FCS features

From: Ang Tien Sung <tien.sung.ang@...el.com>

Extend Intel service layer driver to support FPGA Crypto service(FCS)
features on Intel Soc platforms. Adding an additional channel and FCS
platform driver ("intel_fcs") as part of the probe method.
FCS driver uses the driver to send crypto operations' commands to
the secure device manager(SDM) on Intel Soc platforms Stratix10 and
Agilex.

Signed-off-by: Ang Tien Sung <tien.sung.ang@...el.com>
---
 drivers/firmware/stratix10-svc.c              | 30 +++++++++++++++----
 .../firmware/intel/stratix10-svc-client.h     |  4 +--
 2 files changed, 27 insertions(+), 7 deletions(-)

diff --git a/drivers/firmware/stratix10-svc.c b/drivers/firmware/stratix10-svc.c
index 29c0a616b317..17757b58a8e5 100644
--- a/drivers/firmware/stratix10-svc.c
+++ b/drivers/firmware/stratix10-svc.c
@@ -34,12 +34,13 @@
  * timeout is set to 30 seconds (30 * 1000) at Intel Stratix10 SoC.
  */
 #define SVC_NUM_DATA_IN_FIFO			32
-#define SVC_NUM_CHANNEL				2
+#define SVC_NUM_CHANNEL				3
 #define FPGA_CONFIG_DATA_CLAIM_TIMEOUT_MS	200
 #define FPGA_CONFIG_STATUS_TIMEOUT_SEC		30
 
 /* stratix10 service layer clients */
 #define STRATIX10_RSU				"stratix10-rsu"
+#define INTEL_FCS				"intel-fcs"
 
 typedef void (svc_invoke_fn)(unsigned long, unsigned long, unsigned long,
 			     unsigned long, unsigned long, unsigned long,
@@ -53,6 +54,7 @@ struct stratix10_svc_chan;
  */
 struct stratix10_svc {
 	struct platform_device *stratix10_svc_rsu;
+	struct platform_device *intel_svc_fcs;
 };
 
 /**
@@ -1029,6 +1031,11 @@ static int stratix10_svc_drv_probe(struct platform_device *pdev)
 	chans[1].name = SVC_CLIENT_RSU;
 	spin_lock_init(&chans[1].lock);
 
+	chans[2].scl = NULL;
+	chans[2].ctrl = controller;
+	chans[2].name = SVC_CLIENT_FCS;
+	spin_lock_init(&chans[2].lock);
+
 	list_add_tail(&controller->node, &svc_ctrl);
 	platform_set_drvdata(pdev, controller);
 
@@ -1047,8 +1054,22 @@ static int stratix10_svc_drv_probe(struct platform_device *pdev)
 	}
 
 	ret = platform_device_add(svc->stratix10_svc_rsu);
-	if (ret)
-		goto err_put_device;
+	if (ret) {
+		platform_device_put(svc->stratix10_svc_rsu);
+		return ret;
+	}
+
+	svc->intel_svc_fcs = platform_device_alloc(INTEL_FCS, 1);
+	if (!svc->intel_svc_fcs) {
+		dev_err(dev, "failed to allocate %s device\n", INTEL_FCS);
+		return -ENOMEM;
+	}
+
+	ret = platform_device_add(svc->intel_svc_fcs);
+	if (ret) {
+		platform_device_put(svc->intel_svc_fcs);
+		return ret;
+	}
 
 	dev_set_drvdata(dev, svc);
 
@@ -1056,8 +1077,6 @@ static int stratix10_svc_drv_probe(struct platform_device *pdev)
 
 	return 0;
 
-err_put_device:
-	platform_device_put(svc->stratix10_svc_rsu);
 err_free_kfifo:
 	kfifo_free(&controller->svc_fifo);
 	return ret;
@@ -1068,6 +1087,7 @@ static int stratix10_svc_drv_remove(struct platform_device *pdev)
 	struct stratix10_svc *svc = dev_get_drvdata(&pdev->dev);
 	struct stratix10_svc_controller *ctrl = platform_get_drvdata(pdev);
 
+	platform_device_unregister(svc->intel_svc_fcs);
 	platform_device_unregister(svc->stratix10_svc_rsu);
 
 	kfifo_free(&ctrl->svc_fifo);
diff --git a/include/linux/firmware/intel/stratix10-svc-client.h b/include/linux/firmware/intel/stratix10-svc-client.h
index 19781b0f6429..468490590f85 100644
--- a/include/linux/firmware/intel/stratix10-svc-client.h
+++ b/include/linux/firmware/intel/stratix10-svc-client.h
@@ -14,8 +14,8 @@
  */
 #define SVC_CLIENT_FPGA			"fpga"
 #define SVC_CLIENT_RSU			"rsu"
-
-/*
+#define SVC_CLIENT_FCS			"fcs"
+/**
  * Status of the sent command, in bit number
  *
  * SVC_STATUS_OK:
-- 
2.25.1