1 files changed, 91 insertions, 0 deletions
diff --git a/drivers/crypto/ccree/cc_sram_mgr.c b/drivers/crypto/ccree/cc_sram_mgr.c
new file mode 100644
index 000000000..37a958563
--- /dev/null
+++ b/drivers/crypto/ccree/cc_sram_mgr.c
@@ -0,0 +1,91 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (C) 2012-2019 ARM Limited (or its affiliates). */
+
+#include "cc_driver.h"
+#include "cc_sram_mgr.h"
+
+/**
+ * cc_sram_mgr_init() - Initializes SRAM pool.
+ *      The pool starts right at the beginning of SRAM.
+ *      Returns zero for success, negative value otherwise.
+ *
+ * @drvdata: Associated device driver context
+ *
+ * Return:
+ * 0 for success, negative error code for failure.
+ */
+int cc_sram_mgr_init(struct cc_drvdata *drvdata)
+{
+	u32 start = 0;
+	struct device *dev = drvdata_to_dev(drvdata);
+
+	if (drvdata->hw_rev < CC_HW_REV_712) {
+		/* Pool starts after ROM bytes */
+		start = cc_ioread(drvdata, CC_REG(HOST_SEP_SRAM_THRESHOLD));
+		if ((start & 0x3) != 0) {
+			dev_err(dev, "Invalid SRAM offset 0x%x\n", start);
+			return -EINVAL;
+		}
+	}
+
+	drvdata->sram_free_offset = start;
+	return 0;
+}
+
+/**
+ * cc_sram_alloc() - Allocate buffer from SRAM pool.
+ *
+ * @drvdata: Associated device driver context
+ * @size: The requested numer of bytes to allocate
+ *
+ * Return:
+ * Address offset in SRAM or NULL_SRAM_ADDR for failure.
+ */
+u32 cc_sram_alloc(struct cc_drvdata *drvdata, u32 size)
+{
+	struct device *dev = drvdata_to_dev(drvdata);
+	u32 p;
+
+	if ((size & 0x3)) {
+		dev_err(dev, "Requested buffer size (%u) is not multiple of 4",
+			size);
+		return NULL_SRAM_ADDR;
+	}
+	if (size > (CC_CC_SRAM_SIZE - drvdata->sram_free_offset)) {
+		dev_err(dev, "Not enough space to allocate %u B (at offset %u)\n",
+			size, drvdata->sram_free_offset);
+		return NULL_SRAM_ADDR;
+	}
+
+	p = drvdata->sram_free_offset;
+	drvdata->sram_free_offset += size;
+	dev_dbg(dev, "Allocated %u B @ %u\n", size, p);
+	return p;
+}
+
+/**
+ * cc_set_sram_desc() - Create const descriptors sequence to
+ *	set values in given array into SRAM.
+ * Note: each const value can't exceed word size.
+ *
+ * @src:	  A pointer to array of words to set as consts.
+ * @dst:	  The target SRAM buffer to set into
+ * @nelement:	  The number of words in "src" array
+ * @seq:	  A pointer to the given IN/OUT descriptor sequence
+ * @seq_len:	  A pointer to the given IN/OUT sequence length
+ */
+void cc_set_sram_desc(const u32 *src, u32 dst, unsigned int nelement,
+		      struct cc_hw_desc *seq, unsigned int *seq_len)
+{
+	u32 i;
+	unsigned int idx = *seq_len;
+
+	for (i = 0; i < nelement; i++, idx++) {
+		hw_desc_init(&seq[idx]);
+		set_din_const(&seq[idx], src[i], sizeof(u32));
+		set_dout_sram(&seq[idx], dst + (i * sizeof(u32)), sizeof(u32));
+		set_flow_mode(&seq[idx], BYPASS);
+	}
+
+	*seq_len = idx;
+}