From 1e02e6fbdadb3a0cb56294ff37eeeb8109e1f493 Mon Sep 17 00:00:00 2001
From: Corentin Labbe <clabbe.montjoie@gmail.com>
Date: Wed, 20 Nov 2019 16:28:33 +0100
Subject: [PATCH] crypto: sun4i-ss - add the A33 variant of SS
Git-commit: 1e02e6fbdadb3a0cb56294ff37eeeb8109e1f493
References: git-fixes
Patch-mainline: v5.6-rc1

The A33 SS has a difference with all other SS, it give SHA1 digest
directly in BE.
So this patch adds variant support in sun4i-ss.

Fixes: 6298e948215f ("crypto: sunxi-ss - Add Allwinner Security System crypto accelerator")
Signed-off-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Acked-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Oliver Neukum <oneukum@suse.com>
---
 .../crypto/allwinner/sun4i-ss/sun4i-ss-core.c | 22 ++++++++++++++++++-
 .../crypto/allwinner/sun4i-ss/sun4i-ss-hash.c |  5 ++++-
 drivers/crypto/allwinner/sun4i-ss/sun4i-ss.h  |  9 ++++++++
 3 files changed, 34 insertions(+), 2 deletions(-)

diff --git a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-core.c b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-core.c
index 814cd12149a9..d35a05843c22 100644
--- a/drivers/crypto/sunxi-ss/sun4i-ss-core.c
+++ b/drivers/crypto/sunxi-ss/sun4i-ss-core.c
@@ -13,6 +13,7 @@
 #include <linux/io.h>
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <crypto/scatterwalk.h>
 #include <linux/scatterlist.h>
@@ -22,6 +23,14 @@
 
 #include "sun4i-ss.h"
 
+static const struct ss_variant ss_a10_variant = {
+	.sha1_in_be = false,
+};
+
+static const struct ss_variant ss_a33_variant = {
+	.sha1_in_be = true,
+};
+
 static struct sun4i_ss_alg_template ss_algs[] = {
 {       .type = CRYPTO_ALG_TYPE_AHASH,
 	.mode = SS_OP_MD5,
@@ -323,6 +332,12 @@ static int sun4i_ss_probe(struct platform_device *pdev)
 		return PTR_ERR(ss->base);
 	}
 
+	ss->variant = of_device_get_match_data(&pdev->dev);
+	if (!ss->variant) {
+		dev_err(&pdev->dev, "Missing Security System variant\n");
+		return -EINVAL;
+	}
+
 	ss->ssclk = devm_clk_get(&pdev->dev, "mod");
 	if (IS_ERR(ss->ssclk)) {
 		err = PTR_ERR(ss->ssclk);
@@ -484,7 +499,12 @@ static int sun4i_ss_remove(struct platform_device *pdev)
 }
 
 static const struct of_device_id a20ss_crypto_of_match_table[] = {
-	{ .compatible = "allwinner,sun4i-a10-crypto" },
+	{ .compatible = "allwinner,sun4i-a10-crypto",
+	  .data = &ss_a10_variant
+	},
+	{ .compatible = "allwinner,sun8i-a33-crypto",
+	  .data = &ss_a33_variant
+	},
 	{}
 };
 MODULE_DEVICE_TABLE(of, a20ss_crypto_of_match_table);
diff --git a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-hash.c b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-hash.c
index fdc0e6cdbb85..dc35edd90034 100644
--- a/drivers/crypto/sunxi-ss/sun4i-ss-hash.c
+++ b/drivers/crypto/sunxi-ss/sun4i-ss-hash.c
@@ -479,7 +479,10 @@ static int sun4i_hash(struct ahash_request *areq)
 	/* Get the hash from the device */
 	if (op->mode == SS_OP_SHA1) {
 		for (i = 0; i < 5; i++) {
-			v = cpu_to_be32(readl(ss->base + SS_MD0 + i * 4));
+			if (ss->variant->sha1_in_be)
+				v = cpu_to_le32(readl(ss->base + SS_MD0 + i * 4));
+			else
+				v = cpu_to_be32(readl(ss->base + SS_MD0 + i * 4));
 			memcpy(areq->result + i * 4, &v, 4);
 		}
 	} else {
diff --git a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss.h b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss.h
index 60425ac75d90..2b4c6333eb67 100644
--- a/drivers/crypto/sunxi-ss/sun4i-ss.h
+++ b/drivers/crypto/sunxi-ss/sun4i-ss.h
@@ -131,7 +131,16 @@
 #define SS_SEED_LEN 192
 #define SS_DATA_LEN 160
 
+/*
+ * struct ss_variant - Describe SS hardware variant
+ * @sha1_in_be:		The SHA1 digest is given by SS in BE, and so need to be inverted.
+ */
+struct ss_variant {
+	bool sha1_in_be;
+};
+
 struct sun4i_ss_ctx {
+	const struct ss_variant *variant;
 	void __iomem *base;
 	int irq;
 	struct clk *busclk;
-- 
2.26.2