[PATCH 3/6 v2] crypto:s5p-sss: Add support for SSS module on Exynos

Naveen Krishna Chatradhi
2014-01-09T04:59:12Z

This patch adds new compatible and varient to support the SSS module
on Exynos4 (Exynos4210), Exynos5 (Exynos5420 and Exynos5250) for which
1. AES register are at an offset of 0x200 and
2. hash interrupt is not available

Signed-off-by: Naveen Krishna Ch <ch.naveen@samsung.com>
CC: Herbert Xu <herbert@gondor.apana.org.au>
CC: David S. Miller <davem@davemloft.net>
CC: Vladimir Zapolskiy <vzapolskiy@gmail.com>
TO: <linux-crypto@vger.kernel.org>
CC: <linux-samsung-soc@vger.kernel.org>
---
Changes since v1:
1. Used varient struct
2. Added description in Documentation

.../devicetree/bindings/crypto/samsung-sss.txt | 20 +++++++++
drivers/crypto/s5p-sss.c | 43 ++++++++++++++------
2 files changed, 51 insertions(+), 12 deletions(-)

diff --git a/Documentation/devicetree/bindings/crypto/samsung-sss.txt b/Documentation/devicetree/bindings/crypto/samsung-sss.txt
index 0e45b0d..4531da2 100644
--- a/Documentation/devicetree/bindings/crypto/samsung-sss.txt
+++ b/Documentation/devicetree/bindings/crypto/samsung-sss.txt
@@ -8,13 +8,33 @@ The SSS module in S5PV210 SoC supports the following:
-- SHA-1/SHA-256/MD5/HMAC (SHA-1/SHA-256/MD5)/PRNG
-- PRNG: Pseudo Random Number Generator

+The SSS module in Exynos4 (Exynos4210) and
+Exynos5 (Exynos5420 and Exynos5250) SoCs
+supports the following also:
+-- ARCFOUR (ARC4)
+-- True Random Number Generator (TRNG)
+-- Secure Key Manager
+
Required properties:

- compatible : Should contain entries for this and backward compatible
SSS versions:
- "samsung,s5p-secss" for S5PV210 SoC.
+ - "samsung,exynos-secss" for Exynos4210, Exynos5250 and Exynos5420 SoCs.
- reg : Offset and length of the register set for the module
- interrupts : the interrupt-specifier for the SSS module.
Two interrupts "feed control and hash" in case of S5PV210
+ One interrupts "feed control" in case of Exynos4210,
+ Exynos5250 and Exynos5420 SoCs.
- clocks : the required gating clock for the SSS module.
- clock-names : the gating clock name to be requested in the SSS driver.
+
+Example:
+ /* SSS_VER_5 */
+ sss@10830000 {
+ compatible = "samsung,exynos-secss";
+ reg = <0x10830000 0x10000>;
+ interrupts = <0 112 0>;
+ clocks = <&clock 471>;
+ clock-names = "secss";
+ };
diff --git a/drivers/crypto/s5p-sss.c b/drivers/crypto/s5p-sss.c
index 78e0c37..7c31a5f 100644
--- a/drivers/crypto/s5p-sss.c
+++ b/drivers/crypto/s5p-sss.c
@@ -106,7 +106,7 @@
#define SSS_REG_FCPKDMAO 0x005C

/* AES registers */
-#define SSS_REG_AES_CONTROL 0x4000
+#define SSS_REG_AES_CONTROL 0x00
#define SSS_AES_BYTESWAP_DI _BIT(11)
#define SSS_AES_BYTESWAP_DO _BIT(10)
#define SSS_AES_BYTESWAP_IV _BIT(9)
@@ -122,21 +122,26 @@
#define SSS_AES_CHAIN_MODE_CTR _SBF(1, 0x02)
#define SSS_AES_MODE_DECRYPT _BIT(0)

-#define SSS_REG_AES_STATUS 0x4004
+#define SSS_REG_AES_STATUS 0x04
#define SSS_AES_BUSY _BIT(2)
#define SSS_AES_INPUT_READY _BIT(1)
#define SSS_AES_OUTPUT_READY _BIT(0)

-#define SSS_REG_AES_IN_DATA(s) (0x4010 + (s << 2))
-#define SSS_REG_AES_OUT_DATA(s) (0x4020 + (s << 2))
-#define SSS_REG_AES_IV_DATA(s) (0x4030 + (s << 2))
-#define SSS_REG_AES_CNT_DATA(s) (0x4040 + (s << 2))
-#define SSS_REG_AES_KEY_DATA(s) (0x4080 + (s << 2))
+#define SSS_REG_AES_IN_DATA(off, s) ((off + 0x10) + (s << 2))
+#define SSS_REG_AES_OUT_DATA(off, s) ((off + 0x20) + (s << 2))
+#define SSS_REG_AES_IV_DATA(off, s) ((off + 0x30) + (s << 2))
+#define SSS_REG_AES_CNT_DATA(off, s) ((off + 0x40) + (s << 2))
+#define SSS_REG_AES_KEY_DATA(off, s) ((off + 0x80) + (s << 2))

#define SSS_REG(dev, reg) ((dev)->ioaddr + (SSS_REG_##reg))
#define SSS_READ(dev, reg) __raw_readl(SSS_REG(dev, reg))
#define SSS_WRITE(dev, reg, val) __raw_writel((val), SSS_REG(dev, reg))

+#define SSS_AES_REG(dev, reg) ((dev)->ioaddr + SSS_REG_##reg + \
+ dev->varient->aes_offset)
+#define SSS_AES_WRITE(dev, reg, val) __raw_writel((val), \
+ SSS_AES_REG(dev, reg))
+
/* HW engine modes */
#define FLAGS_AES_DECRYPT _BIT(0)
#define FLAGS_AES_MODE_MASK _SBF(1, 0x03)
@@ -199,6 +204,11 @@ static struct samsung_aes_varient s5p_aes_data = {
.aes_offset = 0x4000,
};

+static struct samsung_aes_varient exynos_aes_data = {
+ .has_hash_irq = false,
+ .aes_offset = 0x200,
+};
+
static const struct platform_device_id s5p_sss_ids[] = {
{
.name = "s5p-secss",
@@ -214,6 +224,10 @@ static const struct of_device_id s5p_sss_dt_match[] = {
.compatible = "samsung,s5p-secss",
.data = (void *)&s5p_aes_data,
},
+ {
+ .compatible = "samsung,exynos-secss",
+ .data = (void *)&exynos_aes_data,
+ },
{ },
};
MODULE_DEVICE_TABLE(of, s5p_sss_dt_match);
@@ -381,16 +395,21 @@ static irqreturn_t s5p_aes_interrupt(int irq, void *dev_id)
static void s5p_set_aes(struct s5p_aes_dev *dev,
uint8_t *key, uint8_t *iv, unsigned int keylen)
{
+ struct samsung_aes_varient *var = dev->varient;
void __iomem *keystart;

- memcpy(dev->ioaddr + SSS_REG_AES_IV_DATA(0), iv, 0x10);
+ memcpy(dev->ioaddr + SSS_REG_AES_IV_DATA
+ (var->aes_offset, 0), iv, 0x10);

if (keylen == AES_KEYSIZE_256)
- keystart = dev->ioaddr + SSS_REG_AES_KEY_DATA(0);
+ keystart = dev->ioaddr +
+ SSS_REG_AES_KEY_DATA(var->aes_offset, 0);
else if (keylen == AES_KEYSIZE_192)
- keystart = dev->ioaddr + SSS_REG_AES_KEY_DATA(2);
+ keystart = dev->ioaddr +
+ SSS_REG_AES_KEY_DATA(var->aes_offset, 2);
else
- keystart = dev->ioaddr + SSS_REG_AES_KEY_DATA(4);
+ keystart = dev->ioaddr +
+ SSS_REG_AES_KEY_DATA(var->aes_offset, 4);

memcpy(keystart, key, keylen);
}
@@ -440,7 +459,7 @@ static void s5p_aes_crypt_start(struct s5p_aes_dev *dev, unsigned long mode)
if (err)
goto outdata_error;

- SSS_WRITE(dev, AES_CONTROL, aes_control);
+ SSS_AES_WRITE(dev, AES_CONTROL, aes_control);
s5p_set_aes(dev, dev->ctx->aes_key, req->info, dev->ctx->keylen);

s5p_set_dma_indata(dev, req->src);
--
1.7.9.5