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path: root/drivers/crypto/caam/blob_gen.c
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Diffstat (limited to 'drivers/crypto/caam/blob_gen.c')
-rw-r--r--drivers/crypto/caam/blob_gen.c182
1 files changed, 182 insertions, 0 deletions
diff --git a/drivers/crypto/caam/blob_gen.c b/drivers/crypto/caam/blob_gen.c
new file mode 100644
index 000000000..6345c7269
--- /dev/null
+++ b/drivers/crypto/caam/blob_gen.c
@@ -0,0 +1,182 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2015 Pengutronix, Steffen Trumtrar <kernel@pengutronix.de>
+ * Copyright (C) 2021 Pengutronix, Ahmad Fatoum <kernel@pengutronix.de>
+ */
+
+#define pr_fmt(fmt) "caam blob_gen: " fmt
+
+#include <linux/device.h>
+#include <soc/fsl/caam-blob.h>
+
+#include "compat.h"
+#include "desc_constr.h"
+#include "desc.h"
+#include "error.h"
+#include "intern.h"
+#include "jr.h"
+#include "regs.h"
+
+#define CAAM_BLOB_DESC_BYTES_MAX \
+ /* Command to initialize & stating length of descriptor */ \
+ (CAAM_CMD_SZ + \
+ /* Command to append the key-modifier + key-modifier data */ \
+ CAAM_CMD_SZ + CAAM_BLOB_KEYMOD_LENGTH + \
+ /* Command to include input key + pointer to the input key */ \
+ CAAM_CMD_SZ + CAAM_PTR_SZ_MAX + \
+ /* Command to include output key + pointer to the output key */ \
+ CAAM_CMD_SZ + CAAM_PTR_SZ_MAX + \
+ /* Command describing the operation to perform */ \
+ CAAM_CMD_SZ)
+
+struct caam_blob_priv {
+ struct device jrdev;
+};
+
+struct caam_blob_job_result {
+ int err;
+ struct completion completion;
+};
+
+static void caam_blob_job_done(struct device *dev, u32 *desc, u32 err, void *context)
+{
+ struct caam_blob_job_result *res = context;
+ int ecode = 0;
+
+ dev_dbg(dev, "%s %d: err 0x%x\n", __func__, __LINE__, err);
+
+ if (err)
+ ecode = caam_jr_strstatus(dev, err);
+
+ res->err = ecode;
+
+ /*
+ * Upon completion, desc points to a buffer containing a CAAM job
+ * descriptor which encapsulates data into an externally-storable
+ * blob.
+ */
+ complete(&res->completion);
+}
+
+int caam_process_blob(struct caam_blob_priv *priv,
+ struct caam_blob_info *info, bool encap)
+{
+ struct caam_blob_job_result testres;
+ struct device *jrdev = &priv->jrdev;
+ dma_addr_t dma_in, dma_out;
+ int op = OP_PCLID_BLOB;
+ size_t output_len;
+ u32 *desc;
+ int ret;
+
+ if (info->key_mod_len > CAAM_BLOB_KEYMOD_LENGTH)
+ return -EINVAL;
+
+ if (encap) {
+ op |= OP_TYPE_ENCAP_PROTOCOL;
+ output_len = info->input_len + CAAM_BLOB_OVERHEAD;
+ } else {
+ op |= OP_TYPE_DECAP_PROTOCOL;
+ output_len = info->input_len - CAAM_BLOB_OVERHEAD;
+ }
+
+ desc = kzalloc(CAAM_BLOB_DESC_BYTES_MAX, GFP_KERNEL | GFP_DMA);
+ if (!desc)
+ return -ENOMEM;
+
+ dma_in = dma_map_single(jrdev, info->input, info->input_len,
+ DMA_TO_DEVICE);
+ if (dma_mapping_error(jrdev, dma_in)) {
+ dev_err(jrdev, "unable to map input DMA buffer\n");
+ ret = -ENOMEM;
+ goto out_free;
+ }
+
+ dma_out = dma_map_single(jrdev, info->output, output_len,
+ DMA_FROM_DEVICE);
+ if (dma_mapping_error(jrdev, dma_out)) {
+ dev_err(jrdev, "unable to map output DMA buffer\n");
+ ret = -ENOMEM;
+ goto out_unmap_in;
+ }
+
+ /*
+ * A data blob is encrypted using a blob key (BK); a random number.
+ * The BK is used as an AES-CCM key. The initial block (B0) and the
+ * initial counter (Ctr0) are generated automatically and stored in
+ * Class 1 Context DWords 0+1+2+3. The random BK is stored in the
+ * Class 1 Key Register. Operation Mode is set to AES-CCM.
+ */
+
+ init_job_desc(desc, 0);
+ append_key_as_imm(desc, info->key_mod, info->key_mod_len,
+ info->key_mod_len, CLASS_2 | KEY_DEST_CLASS_REG);
+ append_seq_in_ptr_intlen(desc, dma_in, info->input_len, 0);
+ append_seq_out_ptr_intlen(desc, dma_out, output_len, 0);
+ append_operation(desc, op);
+
+ print_hex_dump_debug("data@"__stringify(__LINE__)": ",
+ DUMP_PREFIX_ADDRESS, 16, 1, info->input,
+ info->input_len, false);
+ print_hex_dump_debug("jobdesc@"__stringify(__LINE__)": ",
+ DUMP_PREFIX_ADDRESS, 16, 1, desc,
+ desc_bytes(desc), false);
+
+ testres.err = 0;
+ init_completion(&testres.completion);
+
+ ret = caam_jr_enqueue(jrdev, desc, caam_blob_job_done, &testres);
+ if (ret == -EINPROGRESS) {
+ wait_for_completion(&testres.completion);
+ ret = testres.err;
+ print_hex_dump_debug("output@"__stringify(__LINE__)": ",
+ DUMP_PREFIX_ADDRESS, 16, 1, info->output,
+ output_len, false);
+ }
+
+ if (ret == 0)
+ info->output_len = output_len;
+
+ dma_unmap_single(jrdev, dma_out, output_len, DMA_FROM_DEVICE);
+out_unmap_in:
+ dma_unmap_single(jrdev, dma_in, info->input_len, DMA_TO_DEVICE);
+out_free:
+ kfree(desc);
+
+ return ret;
+}
+EXPORT_SYMBOL(caam_process_blob);
+
+struct caam_blob_priv *caam_blob_gen_init(void)
+{
+ struct caam_drv_private *ctrlpriv;
+ struct device *jrdev;
+
+ /*
+ * caam_blob_gen_init() may expectedly fail with -ENODEV, e.g. when
+ * CAAM driver didn't probe or when SoC lacks BLOB support. An
+ * error would be harsh in this case, so we stick to info level.
+ */
+
+ jrdev = caam_jr_alloc();
+ if (IS_ERR(jrdev)) {
+ pr_info("job ring requested, but none currently available\n");
+ return ERR_PTR(-ENODEV);
+ }
+
+ ctrlpriv = dev_get_drvdata(jrdev->parent);
+ if (!ctrlpriv->blob_present) {
+ dev_info(jrdev, "no hardware blob generation support\n");
+ caam_jr_free(jrdev);
+ return ERR_PTR(-ENODEV);
+ }
+
+ return container_of(jrdev, struct caam_blob_priv, jrdev);
+}
+EXPORT_SYMBOL(caam_blob_gen_init);
+
+void caam_blob_gen_exit(struct caam_blob_priv *priv)
+{
+ caam_jr_free(&priv->jrdev);
+}
+EXPORT_SYMBOL(caam_blob_gen_exit);