crypto: add i.MX6 CAAM support

Add the i.MX6 crypto core CAAM with support for the random number
generator.

The core itself works with jobrings in which descriptors can be
queued/dequeued for processing. Depending on descriptor type
the CAAM unit then either produces random numbers or decrypts/encrypts
data.

The code is based on the Linux v4.1 driver of the same name
without all the crypto/hashing components.

Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 390 insertions, 0 deletions

diff --git a/drivers/crypto/caam/desc_constr.h b/drivers/crypto/caam/desc_constr.h
new file mode 100644
index 0000000000..9f79fd7bd4
--- /dev/null
+++ b/drivers/crypto/caam/desc_constr.h
@@ -0,0 +1,390 @@
+/*
+ * caam descriptor construction helper functions
+ *
+ * Copyright 2008-2012 Freescale Semiconductor, Inc.
+ */
+
+#include "desc.h"
+
+#define IMMEDIATE (1 << 23)
+#define CAAM_CMD_SZ sizeof(u32)
+#define CAAM_PTR_SZ sizeof(dma_addr_t)
+#define CAAM_DESC_BYTES_MAX (CAAM_CMD_SZ * MAX_CAAM_DESCSIZE)
+#define DESC_JOB_IO_LEN (CAAM_CMD_SZ * 5 + CAAM_PTR_SZ * 3)
+
+#ifdef DEBUG
+#define PRINT_POS do { printk(KERN_DEBUG "%02d: %s\n", desc_len(desc),\
+			      &__func__[sizeof("append")]); } while (0)
+#else
+#define PRINT_POS
+#endif
+
+#define SET_OK_NO_PROP_ERRORS (IMMEDIATE | LDST_CLASS_DECO | \
+			       LDST_SRCDST_WORD_DECOCTRL | \
+			       (LDOFF_CHG_SHARE_OK_NO_PROP << \
+				LDST_OFFSET_SHIFT))
+#define DISABLE_AUTO_INFO_FIFO (IMMEDIATE | LDST_CLASS_DECO | \
+				LDST_SRCDST_WORD_DECOCTRL | \
+				(LDOFF_DISABLE_AUTO_NFIFO << LDST_OFFSET_SHIFT))
+#define ENABLE_AUTO_INFO_FIFO (IMMEDIATE | LDST_CLASS_DECO | \
+			       LDST_SRCDST_WORD_DECOCTRL | \
+			       (LDOFF_ENABLE_AUTO_NFIFO << LDST_OFFSET_SHIFT))
+
+static inline int desc_len(u32 *desc)
+{
+	return *desc & HDR_DESCLEN_MASK;
+}
+
+static inline int desc_bytes(void *desc)
+{
+	return desc_len(desc) * CAAM_CMD_SZ;
+}
+
+static inline u32 *desc_end(u32 *desc)
+{
+	return desc + desc_len(desc);
+}
+
+static inline void *sh_desc_pdb(u32 *desc)
+{
+	return desc + 1;
+}
+
+static inline void init_desc(u32 *desc, u32 options)
+{
+	*desc = (options | HDR_ONE) + 1;
+}
+
+static inline void init_sh_desc(u32 *desc, u32 options)
+{
+	PRINT_POS;
+	init_desc(desc, CMD_SHARED_DESC_HDR | options);
+}
+
+static inline void init_sh_desc_pdb(u32 *desc, u32 options, size_t pdb_bytes)
+{
+	u32 pdb_len = (pdb_bytes + CAAM_CMD_SZ - 1) / CAAM_CMD_SZ;
+
+	init_sh_desc(desc, (((pdb_len + 1) << HDR_START_IDX_SHIFT) + pdb_len) |
+		     options);
+}
+
+static inline void init_job_desc(u32 *desc, u32 options)
+{
+	init_desc(desc, CMD_DESC_HDR | options);
+}
+
+static inline void append_ptr(u32 *desc, dma_addr_t ptr)
+{
+	dma_addr_t *offset = (dma_addr_t *)desc_end(desc);
+
+	*offset = ptr;
+
+	(*desc) += CAAM_PTR_SZ / CAAM_CMD_SZ;
+}
+
+static inline void init_job_desc_shared(u32 *desc, dma_addr_t ptr, int len,
+					u32 options)
+{
+	PRINT_POS;
+	init_job_desc(desc, HDR_SHARED | options |
+		      (len << HDR_START_IDX_SHIFT));
+	append_ptr(desc, ptr);
+}
+
+static inline void append_data(u32 *desc, void *data, int len)
+{
+	u32 *offset = desc_end(desc);
+
+	if (len) /* avoid sparse warning: memcpy with byte count of 0 */
+		memcpy(offset, data, len);
+
+	(*desc) += (len + CAAM_CMD_SZ - 1) / CAAM_CMD_SZ;
+}
+
+static inline void append_cmd(u32 *desc, u32 command)
+{
+	u32 *cmd = desc_end(desc);
+
+	*cmd = command;
+
+	(*desc)++;
+}
+
+#define append_u32 append_cmd
+
+static inline void append_u64(u32 *desc, u64 data)
+{
+	u32 *offset = desc_end(desc);
+
+	*offset = upper_32_bits(data);
+	*(++offset) = lower_32_bits(data);
+
+	(*desc) += 2;
+}
+
+/* Write command without affecting header, and return pointer to next word */
+static inline u32 *write_cmd(u32 *desc, u32 command)
+{
+	*desc = command;
+
+	return desc + 1;
+}
+
+static inline void append_cmd_ptr(u32 *desc, dma_addr_t ptr, int len,
+				  u32 command)
+{
+	append_cmd(desc, command | len);
+	append_ptr(desc, ptr);
+}
+
+/* Write length after pointer, rather than inside command */
+static inline void append_cmd_ptr_extlen(u32 *desc, dma_addr_t ptr,
+					 unsigned int len, u32 command)
+{
+	append_cmd(desc, command);
+	if (!(command & (SQIN_RTO | SQIN_PRE)))
+		append_ptr(desc, ptr);
+	append_cmd(desc, len);
+}
+
+static inline void append_cmd_data(u32 *desc, void *data, int len,
+				   u32 command)
+{
+	append_cmd(desc, command | IMMEDIATE | len);
+	append_data(desc, data, len);
+}
+
+#define APPEND_CMD_RET(cmd, op) \
+static inline u32 *append_##cmd(u32 *desc, u32 options) \
+{ \
+	u32 *cmd = desc_end(desc); \
+	PRINT_POS; \
+	append_cmd(desc, CMD_##op | options); \
+	return cmd; \
+}
+APPEND_CMD_RET(jump, JUMP)
+APPEND_CMD_RET(move, MOVE)
+
+static inline void set_jump_tgt_here(u32 *desc, u32 *jump_cmd)
+{
+	*jump_cmd = *jump_cmd | (desc_len(desc) - (jump_cmd - desc));
+}
+
+static inline void set_move_tgt_here(u32 *desc, u32 *move_cmd)
+{
+	*move_cmd &= ~MOVE_OFFSET_MASK;
+	*move_cmd = *move_cmd | ((desc_len(desc) << (MOVE_OFFSET_SHIFT + 2)) &
+				 MOVE_OFFSET_MASK);
+}
+
+#define APPEND_CMD(cmd, op) \
+static inline void append_##cmd(u32 *desc, u32 options) \
+{ \
+	PRINT_POS; \
+	append_cmd(desc, CMD_##op | options); \
+}
+APPEND_CMD(operation, OPERATION)
+
+#define APPEND_CMD_LEN(cmd, op) \
+static inline void append_##cmd(u32 *desc, unsigned int len, u32 options) \
+{ \
+	PRINT_POS; \
+	append_cmd(desc, CMD_##op | len | options); \
+}
+
+APPEND_CMD_LEN(seq_load, SEQ_LOAD)
+APPEND_CMD_LEN(seq_store, SEQ_STORE)
+APPEND_CMD_LEN(seq_fifo_load, SEQ_FIFO_LOAD)
+APPEND_CMD_LEN(seq_fifo_store, SEQ_FIFO_STORE)
+
+#define APPEND_CMD_PTR(cmd, op) \
+static inline void append_##cmd(u32 *desc, dma_addr_t ptr, unsigned int len, \
+				u32 options) \
+{ \
+	PRINT_POS; \
+	append_cmd_ptr(desc, ptr, len, CMD_##op | options); \
+}
+APPEND_CMD_PTR(key, KEY)
+APPEND_CMD_PTR(load, LOAD)
+APPEND_CMD_PTR(fifo_load, FIFO_LOAD)
+APPEND_CMD_PTR(fifo_store, FIFO_STORE)
+
+static inline void append_store(u32 *desc, dma_addr_t ptr, unsigned int len,
+				u32 options)
+{
+	u32 cmd_src;
+
+	cmd_src = options & LDST_SRCDST_MASK;
+
+	append_cmd(desc, CMD_STORE | options | len);
+
+	/* The following options do not require pointer */
+	if (!(cmd_src == LDST_SRCDST_WORD_DESCBUF_SHARED ||
+	      cmd_src == LDST_SRCDST_WORD_DESCBUF_JOB    ||
+	      cmd_src == LDST_SRCDST_WORD_DESCBUF_JOB_WE ||
+	      cmd_src == LDST_SRCDST_WORD_DESCBUF_SHARED_WE))
+		append_ptr(desc, ptr);
+}
+
+#define APPEND_SEQ_PTR_INTLEN(cmd, op) \
+static inline void append_seq_##cmd##_ptr_intlen(u32 *desc, dma_addr_t ptr, \
+						 unsigned int len, \
+						 u32 options) \
+{ \
+	PRINT_POS; \
+	if (options & (SQIN_RTO | SQIN_PRE)) \
+		append_cmd(desc, CMD_SEQ_##op##_PTR | len | options); \
+	else \
+		append_cmd_ptr(desc, ptr, len, CMD_SEQ_##op##_PTR | options); \
+}
+APPEND_SEQ_PTR_INTLEN(in, IN)
+APPEND_SEQ_PTR_INTLEN(out, OUT)
+
+#define APPEND_CMD_PTR_TO_IMM(cmd, op) \
+static inline void append_##cmd##_as_imm(u32 *desc, void *data, \
+					 unsigned int len, u32 options) \
+{ \
+	PRINT_POS; \
+	append_cmd_data(desc, data, len, CMD_##op | options); \
+}
+APPEND_CMD_PTR_TO_IMM(load, LOAD);
+APPEND_CMD_PTR_TO_IMM(fifo_load, FIFO_LOAD);
+
+#define APPEND_CMD_PTR_EXTLEN(cmd, op) \
+static inline void append_##cmd##_extlen(u32 *desc, dma_addr_t ptr, \
+					 unsigned int len, u32 options) \
+{ \
+	PRINT_POS; \
+	append_cmd_ptr_extlen(desc, ptr, len, CMD_##op | SQIN_EXT | options); \
+}
+APPEND_CMD_PTR_EXTLEN(seq_in_ptr, SEQ_IN_PTR)
+APPEND_CMD_PTR_EXTLEN(seq_out_ptr, SEQ_OUT_PTR)
+
+/*
+ * Determine whether to store length internally or externally depending on
+ * the size of its type
+ */
+#define APPEND_CMD_PTR_LEN(cmd, op, type) \
+static inline void append_##cmd(u32 *desc, dma_addr_t ptr, \
+				type len, u32 options) \
+{ \
+	PRINT_POS; \
+	if (sizeof(type) > sizeof(u16)) \
+		append_##cmd##_extlen(desc, ptr, len, options); \
+	else \
+		append_##cmd##_intlen(desc, ptr, len, options); \
+}
+APPEND_CMD_PTR_LEN(seq_in_ptr, SEQ_IN_PTR, u32)
+APPEND_CMD_PTR_LEN(seq_out_ptr, SEQ_OUT_PTR, u32)
+
+/*
+ * 2nd variant for commands whose specified immediate length differs
+ * from length of immediate data provided, e.g., split keys
+ */
+#define APPEND_CMD_PTR_TO_IMM2(cmd, op) \
+static inline void append_##cmd##_as_imm(u32 *desc, void *data, \
+					 unsigned int data_len, \
+					 unsigned int len, u32 options) \
+{ \
+	PRINT_POS; \
+	append_cmd(desc, CMD_##op | IMMEDIATE | len | options); \
+	append_data(desc, data, data_len); \
+}
+APPEND_CMD_PTR_TO_IMM2(key, KEY);
+
+#define APPEND_CMD_RAW_IMM(cmd, op, type) \
+static inline void append_##cmd##_imm_##type(u32 *desc, type immediate, \
+					     u32 options) \
+{ \
+	PRINT_POS; \
+	append_cmd(desc, CMD_##op | IMMEDIATE | options | sizeof(type)); \
+	append_cmd(desc, immediate); \
+}
+APPEND_CMD_RAW_IMM(load, LOAD, u32);
+
+/*
+ * Append math command. Only the last part of destination and source need to
+ * be specified
+ */
+#define APPEND_MATH(op, desc, dest, src_0, src_1, len) \
+append_cmd(desc, CMD_MATH | MATH_FUN_##op | MATH_DEST_##dest | \
+	MATH_SRC0_##src_0 | MATH_SRC1_##src_1 | (u32)len);
+
+#define append_math_add(desc, dest, src0, src1, len) \
+	APPEND_MATH(ADD, desc, dest, src0, src1, len)
+#define append_math_sub(desc, dest, src0, src1, len) \
+	APPEND_MATH(SUB, desc, dest, src0, src1, len)
+#define append_math_add_c(desc, dest, src0, src1, len) \
+	APPEND_MATH(ADDC, desc, dest, src0, src1, len)
+#define append_math_sub_b(desc, dest, src0, src1, len) \
+	APPEND_MATH(SUBB, desc, dest, src0, src1, len)
+#define append_math_and(desc, dest, src0, src1, len) \
+	APPEND_MATH(AND, desc, dest, src0, src1, len)
+#define append_math_or(desc, dest, src0, src1, len) \
+	APPEND_MATH(OR, desc, dest, src0, src1, len)
+#define append_math_xor(desc, dest, src0, src1, len) \
+	APPEND_MATH(XOR, desc, dest, src0, src1, len)
+#define append_math_lshift(desc, dest, src0, src1, len) \
+	APPEND_MATH(LSHIFT, desc, dest, src0, src1, len)
+#define append_math_rshift(desc, dest, src0, src1, len) \
+	APPEND_MATH(RSHIFT, desc, dest, src0, src1, len)
+#define append_math_ldshift(desc, dest, src0, src1, len) \
+	APPEND_MATH(SHLD, desc, dest, src0, src1, len)
+
+/* Exactly one source is IMM. Data is passed in as u32 value */
+#define APPEND_MATH_IMM_u32(op, desc, dest, src_0, src_1, data) \
+do { \
+	APPEND_MATH(op, desc, dest, src_0, src_1, CAAM_CMD_SZ); \
+	append_cmd(desc, data); \
+} while (0)
+
+#define append_math_add_imm_u32(desc, dest, src0, src1, data) \
+	APPEND_MATH_IMM_u32(ADD, desc, dest, src0, src1, data)
+#define append_math_sub_imm_u32(desc, dest, src0, src1, data) \
+	APPEND_MATH_IMM_u32(SUB, desc, dest, src0, src1, data)
+#define append_math_add_c_imm_u32(desc, dest, src0, src1, data) \
+	APPEND_MATH_IMM_u32(ADDC, desc, dest, src0, src1, data)
+#define append_math_sub_b_imm_u32(desc, dest, src0, src1, data) \
+	APPEND_MATH_IMM_u32(SUBB, desc, dest, src0, src1, data)
+#define append_math_and_imm_u32(desc, dest, src0, src1, data) \
+	APPEND_MATH_IMM_u32(AND, desc, dest, src0, src1, data)
+#define append_math_or_imm_u32(desc, dest, src0, src1, data) \
+	APPEND_MATH_IMM_u32(OR, desc, dest, src0, src1, data)
+#define append_math_xor_imm_u32(desc, dest, src0, src1, data) \
+	APPEND_MATH_IMM_u32(XOR, desc, dest, src0, src1, data)
+#define append_math_lshift_imm_u32(desc, dest, src0, src1, data) \
+	APPEND_MATH_IMM_u32(LSHIFT, desc, dest, src0, src1, data)
+#define append_math_rshift_imm_u32(desc, dest, src0, src1, data) \
+	APPEND_MATH_IMM_u32(RSHIFT, desc, dest, src0, src1, data)
+
+/* Exactly one source is IMM. Data is passed in as u64 value */
+#define APPEND_MATH_IMM_u64(op, desc, dest, src_0, src_1, data) \
+do { \
+	u32 upper = (data >> 16) >> 16; \
+	APPEND_MATH(op, desc, dest, src_0, src_1, CAAM_CMD_SZ * 2 | \
+		    (upper ? 0 : MATH_IFB)); \
+	if (upper) \
+		append_u64(desc, data); \
+	else \
+		append_u32(desc, data); \
+} while (0)
+
+#define append_math_add_imm_u64(desc, dest, src0, src1, data) \
+	APPEND_MATH_IMM_u64(ADD, desc, dest, src0, src1, data)
+#define append_math_sub_imm_u64(desc, dest, src0, src1, data) \
+	APPEND_MATH_IMM_u64(SUB, desc, dest, src0, src1, data)
+#define append_math_add_c_imm_u64(desc, dest, src0, src1, data) \
+	APPEND_MATH_IMM_u64(ADDC, desc, dest, src0, src1, data)
+#define append_math_sub_b_imm_u64(desc, dest, src0, src1, data) \
+	APPEND_MATH_IMM_u64(SUBB, desc, dest, src0, src1, data)
+#define append_math_and_imm_u64(desc, dest, src0, src1, data) \
+	APPEND_MATH_IMM_u64(AND, desc, dest, src0, src1, data)
+#define append_math_or_imm_u64(desc, dest, src0, src1, data) \
+	APPEND_MATH_IMM_u64(OR, desc, dest, src0, src1, data)
+#define append_math_xor_imm_u64(desc, dest, src0, src1, data) \
+	APPEND_MATH_IMM_u64(XOR, desc, dest, src0, src1, data)
+#define append_math_lshift_imm_u64(desc, dest, src0, src1, data) \
+	APPEND_MATH_IMM_u64(LSHIFT, desc, dest, src0, src1, data)
+#define append_math_rshift_imm_u64(desc, dest, src0, src1, data) \
+	APPEND_MATH_IMM_u64(RSHIFT, desc, dest, src0, src1, data)