MLK-17302: crypto: caam: Move RNG instantiation to SECO

 On i.MX8 platforms with SECO/SCU the RNG is not anymore instantiated
 by the Kernel driver but by SECO. This is true for B0 revision and
 later. A0 revision is not supported.

Signed-off-by: Aymen Sghaier <aymen.sghaier@nxp.com>

3 files changed, 7 insertions, 65 deletions

diff --git a/drivers/crypto/caam/inst_rng.c b/drivers/crypto/caam/inst_rng.c
index 7ab379dfe448..a8ed0816ff0e 100644
--- a/drivers/crypto/caam/inst_rng.c
+++ b/drivers/crypto/caam/inst_rng.c
@@ -7,7 +7,6 @@
 
 #include <linux/device.h>
 #include <linux/of_address.h>
-#include <soc/imx8/sc/sci.h>
 #include <linux/wait.h>
 #include "compat.h"
 #include "regs.h"
@@ -271,10 +270,10 @@ static void kick_trng(struct device *ctrldev, int ent_delay)
 }
 
 /*
- * inst_rng_imx6 - RNG instantiation function for i.MX6/7 platforms
+ * inst_rng_imx - RNG instantiation function for i.MX6/7/8m platforms
  * @pdev - pointer to the device
  */
-int inst_rng_imx6(struct platform_device *pdev)
+int inst_rng_imx(struct platform_device *pdev)
 {
 	struct device *ctrldev, *dev;
 	struct caam_drv_private *ctrlpriv;
@@ -367,43 +366,6 @@ int inst_rng_imx6(struct platform_device *pdev)
 }
 
 /*
- * inst_rng_imx8 - RNG instantiation function for i.MX8 platforms
- * @pdev - pointer to the device
- */
-int inst_rng_imx8(struct platform_device *pdev)
-{
-	struct device *ctrldev, *dev;
-	struct caam_drv_private *ctrlpriv;
-	struct caam_ctrl __iomem *ctrl;
-	int ret = 0, rdx;
-	u32 cha_vid_ls;
-
-	dev = &pdev->dev;
-	ctrldev = pdev->dev.parent;
-	ctrlpriv = dev_get_drvdata(ctrldev);
-	ctrl = (struct caam_ctrl __iomem *)ctrlpriv->ctrl;
-
-	rdx = ctrlpriv->first_jr_index;
-	cha_vid_ls = rd_reg32(&ctrlpriv->jr[rdx]->perfmon.cha_id_ls);
-	/*
-	 * If SEC has RNG version >= 4 and RNG state handle has not been
-	 * already instantiated, do RNG instantiation
-	 */
-	if ((cha_vid_ls & CHA_ID_LS_RNG_MASK) >> CHA_ID_LS_RNG_SHIFT >= 4) {
-		/*
-		 * For i.MX8QM rev A0 the secure keys (TDKEK, JDKEK, TDSK),
-		 * are not * generated so gen_sk is set to 1.
-		 */
-		ret = instantiate_rng(0, 1);
-	}
-	/*
-	 * For i.MX8QM rev A0, SH0 and SH1 are instantiated here.
-	 */
-	ctrlpriv->rng4_sh_init = RDSTA_IFMASK;
-	return ret;
-}
-
-/*
  * deinst_rng - RNG de-instantiation function
  * @pdev - pointer to the device
  */
diff --git a/drivers/crypto/caam/inst_rng.h b/drivers/crypto/caam/inst_rng.h
index 87bfc2c9fcf8..e0477262fe2a 100644
--- a/drivers/crypto/caam/inst_rng.h
+++ b/drivers/crypto/caam/inst_rng.h
@@ -2,7 +2,7 @@
 /*
  * CAAM Private/internal definitions between modules
  *
- * Copyright 2017-2018 NXP Semiconductor, Inc.
+ * Copyright 2017-2018 NXP
  */
 
 #ifndef INST_RNG_H
@@ -11,9 +11,7 @@
 #include <linux/platform_device.h>
 
 #define ENT_DELAY_STEP	(400)
-int inst_rng_imx6(struct platform_device *pdev);
-
-int inst_rng_imx8(struct platform_device *pdev);
+int inst_rng_imx(struct platform_device *pdev);
 
 int deinst_rng(struct platform_device *pdev);
 
diff --git a/drivers/crypto/caam/jr.c b/drivers/crypto/caam/jr.c
index 847d91a5ca7e..c400c3c4319b 100644
--- a/drivers/crypto/caam/jr.c
+++ b/drivers/crypto/caam/jr.c
@@ -578,33 +578,15 @@ static int caam_jr_probe(struct platform_device *pdev)
 	 * then try to instantiate RNG
 	 */
 	if (jrppriv->ridx == jrpriv->ridx) {
-		if (of_machine_is_compatible("fsl,imx8qm") ||
-			of_machine_is_compatible("fsl,imx8qxp")) {
-			/*
-			 * This is a workaround for SOC REV_A0:
-			 * i.MX8QM and i.MX8QXP reach kernel level
-			 * with RNG un-instantiated. It is instantiated
-			 * here unlike REV_B0 and later.
-			 */
-#ifdef CONFIG_HAVE_IMX8_SOC
-			if (imx8_get_soc_revision() == IMX_CHIP_REVISION_1_0)
-				error = inst_rng_imx8(pdev);
-#endif
-		} else {
+		if (!of_machine_is_compatible("fsl,imx8qm") &&
+		    !of_machine_is_compatible("fsl,imx8qxp"))
 			/*
 			 * This call is done for legacy SOCs:
 			 * i.MX6 i.MX7 and i.MX8M (mScale).
 			 */
-			error = inst_rng_imx6(pdev);
-		}
+			error = inst_rng_imx(pdev);
 	}
 	if (error != 0) {
-#ifdef CONFIG_HAVE_IMX8_SOC
-		if (imx8_get_soc_revision() == IMX_CHIP_REVISION_1_0)
-			dev_err(jrdev,
-				"This is a known limitation on A0 SOC revision\n"
-				"RNG instantiation failed, CAAM needs a reboot\n");
-#endif /* CONFIG_HAVE_IMX8_SOC */
 		spin_lock(&driver_data.jr_alloc_lock);
 		list_del(&jrpriv->list_node);
 		spin_unlock(&driver_data.jr_alloc_lock);