1 files changed, 157 insertions, 0 deletions
diff --git a/drivers/crypto/inside-secure/safexcel_ring.c b/drivers/crypto/inside-secure/safexcel_ring.c
new file mode 100644
index 000000000000..c9d2a8716b5b
--- /dev/null
+++ b/drivers/crypto/inside-secure/safexcel_ring.c
@@ -0,0 +1,157 @@
+/*
+ * Copyright (C) 2017 Marvell
+ *
+ * Antoine Tenart <antoine.tenart@free-electrons.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/dma-mapping.h>
+#include <linux/spinlock.h>
+
+#include "safexcel.h"
+
+int safexcel_init_ring_descriptors(struct safexcel_crypto_priv *priv,
+				   struct safexcel_ring *cdr,
+				   struct safexcel_ring *rdr)
+{
+	cdr->offset = sizeof(u32) * priv->config.cd_offset;
+	cdr->base = dmam_alloc_coherent(priv->dev,
+					cdr->offset * EIP197_DEFAULT_RING_SIZE,
+					&cdr->base_dma, GFP_KERNEL);
+	if (!cdr->base)
+		return -ENOMEM;
+	cdr->write = cdr->base;
+	cdr->base_end = cdr->base + cdr->offset * EIP197_DEFAULT_RING_SIZE;
+	cdr->read = cdr->base;
+
+	rdr->offset = sizeof(u32) * priv->config.rd_offset;
+	rdr->base = dmam_alloc_coherent(priv->dev,
+					rdr->offset * EIP197_DEFAULT_RING_SIZE,
+					&rdr->base_dma, GFP_KERNEL);
+	if (!rdr->base)
+		return -ENOMEM;
+	rdr->write = rdr->base;
+	rdr->base_end = rdr->base + rdr->offset * EIP197_DEFAULT_RING_SIZE;
+	rdr->read = rdr->base;
+
+	return 0;
+}
+
+inline int safexcel_select_ring(struct safexcel_crypto_priv *priv)
+{
+	return (atomic_inc_return(&priv->ring_used) % priv->config.rings);
+}
+
+static void *safexcel_ring_next_wptr(struct safexcel_crypto_priv *priv,
+				     struct safexcel_ring *ring)
+{
+	void *ptr = ring->write;
+
+	if (ring->nr == EIP197_DEFAULT_RING_SIZE - 1)
+		return ERR_PTR(-ENOMEM);
+
+	ring->write += ring->offset;
+	if (ring->write == ring->base_end)
+		ring->write = ring->base;
+
+	ring->nr++;
+	return ptr;
+}
+
+void *safexcel_ring_next_rptr(struct safexcel_crypto_priv *priv,
+			      struct safexcel_ring *ring)
+{
+	void *ptr = ring->read;
+
+	if (!ring->nr)
+		return ERR_PTR(-ENOENT);
+
+	ring->read += ring->offset;
+	if (ring->read == ring->base_end)
+		ring->read = ring->base;
+
+	ring->nr--;
+	return ptr;
+}
+
+void safexcel_ring_rollback_wptr(struct safexcel_crypto_priv *priv,
+				 struct safexcel_ring *ring)
+{
+	if (!ring->nr)
+		return;
+
+	if (ring->write == ring->base)
+		ring->write = ring->base_end - ring->offset;
+	else
+		ring->write -= ring->offset;
+
+	ring->nr--;
+}
+
+struct safexcel_command_desc *safexcel_add_cdesc(struct safexcel_crypto_priv *priv,
+						 int ring_id,
+						 bool first, bool last,
+						 dma_addr_t data, u32 data_len,
+						 u32 full_data_len,
+						 dma_addr_t context) {
+	struct safexcel_command_desc *cdesc;
+	int i;
+
+	cdesc = safexcel_ring_next_wptr(priv, &priv->ring[ring_id].cdr);
+	if (IS_ERR(cdesc))
+		return cdesc;
+
+	memset(cdesc, 0, sizeof(struct safexcel_command_desc));
+
+	cdesc->first_seg = first;
+	cdesc->last_seg = last;
+	cdesc->particle_size = data_len;
+	cdesc->data_lo = lower_32_bits(data);
+	cdesc->data_hi = upper_32_bits(data);
+
+	if (first && context) {
+		struct safexcel_token *token =
+			(struct safexcel_token *)cdesc->control_data.token;
+
+		cdesc->control_data.packet_length = full_data_len;
+		cdesc->control_data.options = EIP197_OPTION_MAGIC_VALUE |
+					      EIP197_OPTION_64BIT_CTX |
+					      EIP197_OPTION_CTX_CTRL_IN_CMD;
+		cdesc->control_data.context_lo =
+			(lower_32_bits(context) & GENMASK(31, 2)) >> 2;
+		cdesc->control_data.context_hi = upper_32_bits(context);
+
+		/* TODO: large xform HMAC with SHA-384/512 uses refresh = 3 */
+		cdesc->control_data.refresh = 2;
+
+		for (i = 0; i < EIP197_MAX_TOKENS; i++)
+			eip197_noop_token(&token[i]);
+	}
+
+	return cdesc;
+}
+
+struct safexcel_result_desc *safexcel_add_rdesc(struct safexcel_crypto_priv *priv,
+						int ring_id,
+						bool first, bool last,
+						dma_addr_t data, u32 len)
+{
+	struct safexcel_result_desc *rdesc;
+
+	rdesc = safexcel_ring_next_wptr(priv, &priv->ring[ring_id].rdr);
+	if (IS_ERR(rdesc))
+		return rdesc;
+
+	memset(rdesc, 0, sizeof(struct safexcel_result_desc));
+
+	rdesc->first_seg = first;
+	rdesc->last_seg = last;
+	rdesc->particle_size = len;
+	rdesc->data_lo = lower_32_bits(data);
+	rdesc->data_hi = upper_32_bits(data);
+
+	return rdesc;
+}