From: Michael Walle <michael@walle.cc>
Date: Fri, 16 Oct 2020 17:38:18 +0000 (+0200)
Subject: armv8: layerscape: don't remove crypto node if just partially disabled
X-Git-Url: http://git.dujemihanovic.xyz/login.html?a=commitdiff_plain;h=4eecc6f1a104b5f3737c7e1bbaaa022e5d3bac53;p=u-boot.git

armv8: layerscape: don't remove crypto node if just partially disabled

On all newer Layerscape SoCs, only the export-controlled ciphers of the
crypto module are disabled on non-E parts. Thus it doesn't make sense to
completely remove the node. Linux will figure out what is there and what
is not.

Just remove it for older SoCs, where the module is indeed completely
disabled on non-E parts.

Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Horia Geanta <horia.geanta@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
---

diff --git a/arch/arm/cpu/armv8/fsl-layerscape/fdt.c b/arch/arm/cpu/armv8/fsl-layerscape/fdt.c
index 7400b2cf29..6d3391db3b 100644
--- a/arch/arm/cpu/armv8/fsl-layerscape/fdt.c
+++ b/arch/arm/cpu/armv8/fsl-layerscape/fdt.c
@@ -437,13 +437,52 @@ __weak void fdt_fixup_ecam(void *blob)
 }
 #endif
 
+/*
+ * If it is a non-E part the crypto is disabled on the following SoCs:
+ *  - LS1043A
+ *  - LS1088A
+ *  - LS2080A
+ *  - LS2088A
+ * and their personalities.
+ *
+ * On all other SoCs just the export-controlled ciphers are disabled, that
+ * means that the following is still working:
+ *  - hashing (using MDHA - message digest hash accelerator)
+ *  - random number generation (using RNG4)
+ *  - cyclic redundancy checking (using CRCA)
+ *  - runtime integrity checker (RTIC)
+ *
+ * The linux driver will figure out what is available and what is not.
+ * Therefore, we just remove the crypto node on the SoCs which have no crypto
+ * support at all.
+ */
+static bool crypto_is_disabled(unsigned int svr)
+{
+	if (IS_E_PROCESSOR(svr))
+		return false;
+
+	if (IS_SVR_DEV(svr, SVR_DEV(SVR_LS1043A)))
+		return true;
+
+	if (IS_SVR_DEV(svr, SVR_DEV(SVR_LS1088A)))
+		return true;
+
+	if (IS_SVR_DEV(svr, SVR_DEV(SVR_LS2080A)))
+		return true;
+
+	if (IS_SVR_DEV(svr, SVR_DEV(SVR_LS2088A)))
+		return true;
+
+	return false;
+}
+
 void ft_cpu_setup(void *blob, struct bd_info *bd)
 {
 	struct ccsr_gur __iomem *gur = (void *)(CONFIG_SYS_FSL_GUTS_ADDR);
 	unsigned int svr = gur_in32(&gur->svr);
 
 	/* delete crypto node if not on an E-processor */
-	if (!IS_E_PROCESSOR(svr))
+	if (crypto_is_disabled(svr))
 		fdt_fixup_crypto_node(blob, 0);
 #if CONFIG_SYS_FSL_SEC_COMPAT >= 4
 	else {