// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2020 Rockchip Electronics Co., Ltd.
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*/
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#include <linux/iopoll.h>
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#include "rk_crypto_core.h"
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#include "rk_crypto_v2.h"
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#include "rk_crypto_v2_reg.h"
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#include "rk_crypto_v2_pka.h"
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#define PKA_WORDS2BITS(words) ((words) * 32)
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#define PKA_BITS2WORDS(bits) (((bits) + 31) / 32)
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#define PKA_WORDS2BYTES(words) ((words) * 4)
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#define PKA_BYTES2BITS(bytes) ((bytes) * 8)
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/* PKA length set */
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enum {
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PKA_EXACT_LEN_ID = 0,
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PKA_CALC_LEN_ID,
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PKA_USED_LEN_MAX,
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};
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/********************* Private MACRO Definition ******************************/
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#define PKA_POLL_PERIOD_US 1000
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#define PKA_POLL_TIMEOUT_US 50000
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/* for private key EXP_MOD operation */
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#define PKA_MAX_POLL_PERIOD_US 20000
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#define PKA_MAX_POLL_TIMEOUT_US 2000000
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#define PKA_MAX_CALC_BITS 4096
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#define PKA_MAX_CALC_WORDS PKA_BITS2WORDS(PKA_MAX_CALC_BITS)
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/* PKA N_NP_T0_T1 register default (reset) value: N=0, NP=1, T0=30, T1=31 */
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#define PKA_N 0UL
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#define PKA_NP 1UL
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#define PKA_T0 30UL /*tmp reg */
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#define PKA_T1 31UL /*tmp reg */
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#define PKA_TMP_REG_CNT 2
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#define PKA_N_NP_T0_T1_REG_DEFAULT \
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(PKA_N << CRYPTO_N_VIRTUAL_ADDR_SHIFT | \
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PKA_NP << CRYPTO_NP_VIRTUAL_ADDR_SHIFT | \
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PKA_T0 << CRYPTO_T0_VIRTUAL_ADDR_SHIFT | \
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PKA_T1 << CRYPTO_T1_VIRTUAL_ADDR_SHIFT)
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#define RES_DISCARD 0x3F
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/* values for defining, that PKA entry is not in use */
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#define PKA_ADDR_NOT_USED 0xFFC
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/* Machine Opcodes definitions (according to HW CRS ) */
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enum pka_opcode {
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PKA_OPCODE_ADD = 0x04,
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PKA_OPCODE_SUB,
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PKA_OPCODE_MOD_ADD,
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PKA_OPCODE_MOD_SUB,
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PKA_OPCODE_AND,
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PKA_OPCODE_OR,
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PKA_OPCODE_XOR,
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PKA_OPCODE_SHR0 = 0x0C,
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PKA_OPCODE_SHR1,
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PKA_OPCODE_SHL0,
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PKA_OPCODE_SHL1,
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PKA_OPCODE_LMUL,
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PKA_OPCODE_MOD_MUL,
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PKA_OPCODE_MOD_MUL_NR,
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PKA_OPCODE_MOD_EXP,
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PKA_OPCODE_DIV,
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PKA_OPCODE_MOD_INV,
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PKA_OPCODE_MOD_DIV,
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PKA_OPCODE_HMUL,
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PKA_OPCODE_TERMINATE,
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};
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#define PKA_CLK_ENABLE()
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#define PKA_CLK_DISABLE()
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#define PKA_READ(offset) readl_relaxed((pka_base) + (offset))
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#define PKA_WRITE(val, offset) writel_relaxed((val), (pka_base) + (offset))
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#define PKA_BIGNUM_WORDS(x) (rk_bn_get_size(x) / sizeof(u32))
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#define PKA_RAM_FOR_PKA() PKA_WRITE((CRYPTO_RAM_PKA_RDY << CRYPTO_WRITE_MASK_SHIFT) | \
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CRYPTO_RAM_PKA_RDY, CRYPTO_RAM_CTL)
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#define PKA_RAM_FOR_CPU() do { \
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PKA_WRITE((CRYPTO_RAM_PKA_RDY << CRYPTO_WRITE_MASK_SHIFT), CRYPTO_RAM_CTL); \
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while ((PKA_READ(CRYPTO_RAM_ST) & 0x01) != CRYPTO_CLK_RAM_RDY) \
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cpu_relax(); \
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} while (0)
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#define PKA_GET_SRAM_ADDR(addr) ((void *)(pka_base + CRYPTO_SRAM_BASE + (addr)))
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/*************************************************************************
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* Macros for calling PKA operations (names according to operation issue *
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*************************************************************************/
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/*--------------------------------------*/
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/* 1. ADD - SUBTRACT operations */
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/*--------------------------------------*/
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/* Add: res = op_a + op_b */
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#define RK_PKA_ADD(op_a, op_b, res) pka_exec_op(PKA_OPCODE_ADD, PKA_CALC_LEN_ID, \
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0, (op_a), 0, (op_b), 0, (res), 0)
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/* Clr: res = op_a & 0 - clears the operand A. */
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#define RK_PKA_CLR(op_a) pka_exec_op(PKA_OPCODE_AND, PKA_CALC_LEN_ID, \
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0, (op_a), 1, 0x00, 0, (op_a), 0)
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/* Copy: OpDest = OpSrc || 0 */
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#define RK_PKA_COPY(op_dest, op_src) pka_exec_op(PKA_OPCODE_OR, PKA_CALC_LEN_ID, \
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0, (op_src), 1, 0x00, 0, (op_dest), 0)
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/* Set0: res = op_a || 1 : set bit0 = 1, other bits are not changed */
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#define RK_PKA_SET_0(op_a, res) pka_exec_op(PKA_OPCODE_OR, PKA_CALC_LEN_ID, \
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0, (op_a), 1, 0x01, 0, (res), 0)
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/*----------------------------------------------*/
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/* 3. SHIFT operations */
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/*----------------------------------------------*/
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/* SHL0: res = op_a << (S+1) :
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* shifts left operand A by S+1 bits, insert 0 to right most bits
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*/
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#define RK_PKA_SHL0(op_a, S, res) pka_exec_op(PKA_OPCODE_SHL0, PKA_CALC_LEN_ID, \
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0, (op_a), 0, (S), 0, (res), 0)
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/* SHL1: res = op_a << (S+1) :
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* shifts left operand A by S+1 bits, insert 1 to right most bits
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*/
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#define RK_PKA_SHL1(op_a, S, res) pka_exec_op(PKA_OPCODE_SHL1, PKA_CALC_LEN_ID, \
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0, (op_a), 0, (S), 0, (res), 0)
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/*--------------------------------------------------------------*/
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/* 2. Multiplication and other operations */
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/* Note: See notes to RK_PKAExecOperation */
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/*--------------------------------------------------------------*/
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/* ModExp: res = op_a ** op_b mod N - modular exponentiation */
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#define RK_PKA_MOD_EXP(op_a, op_b, res) \
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pka_exec_op(PKA_OPCODE_MOD_EXP, PKA_EXACT_LEN_ID, 0, (op_a), \
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0, (op_b), 0, (res), 0)
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/* Divide: res = op_a / op_b , op_a = op_a mod op_b - division, */
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#define RK_PKA_DIV(op_a, op_b, res) pka_exec_op(PKA_OPCODE_DIV, PKA_CALC_LEN_ID, \
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0, (op_a), 0, (op_b), 0, (res), 0)
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/* Terminate - special operation, which allows HOST access */
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/* to PKA data memory registers after end of PKA operations */
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#define RK_PKA_TERMINATE() pka_exec_op(PKA_OPCODE_TERMINATE, 0, 0, 0, 0, 0, 0, 0, 0)
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/********************* Private Variable Definition ***************************/
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static void __iomem *pka_base;
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static void pka_word_memcpy(u32 *dst, u32 *src, u32 size)
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{
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u32 i;
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for (i = 0; i < size; i++, dst++)
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writel_relaxed(src[i], (void *)dst);
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}
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static void pka_word_memset(u32 *buff, u32 val, u32 size)
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{
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u32 i;
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for (i = 0; i < size; i++, buff++)
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writel_relaxed(val, (void *)buff);
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}
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static int pka_wait_pipe_rdy(void)
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{
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u32 reg_val = 0;
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return readx_poll_timeout(PKA_READ, CRYPTO_PKA_PIPE_RDY, reg_val,
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reg_val, PKA_POLL_PERIOD_US, PKA_POLL_TIMEOUT_US);
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}
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static int pka_wait_done(void)
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{
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u32 reg_val = 0;
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return readx_poll_timeout(PKA_READ, CRYPTO_PKA_DONE, reg_val,
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reg_val, PKA_POLL_PERIOD_US, PKA_POLL_TIMEOUT_US);
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}
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static int pka_max_wait_done(void)
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{
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u32 reg_val = 0;
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return readx_poll_timeout(PKA_READ, CRYPTO_PKA_DONE, reg_val,
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reg_val, PKA_MAX_POLL_PERIOD_US, PKA_MAX_POLL_TIMEOUT_US);
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}
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static u32 pka_check_status(u32 mask)
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{
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u32 status;
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pka_wait_done();
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status = PKA_READ(CRYPTO_PKA_STATUS);
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status = status & mask;
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return !!status;
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}
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static void pka_set_len_words(u32 words, u32 index)
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{
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PKA_WRITE(PKA_WORDS2BITS(words), CRYPTO_PKA_L0 + index * sizeof(u32));
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}
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static u32 pka_get_len_words(u32 index)
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{
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pka_wait_done();
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return PKA_BITS2WORDS(PKA_READ(CRYPTO_PKA_L0 + (index) * sizeof(u32)));
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}
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static void pka_set_map_addr(u32 addr, u32 index)
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{
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PKA_WRITE(addr, CRYPTO_MEMORY_MAP0 + sizeof(u32) * index);
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}
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static u32 pka_get_map_addr(u32 index)
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{
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pka_wait_done();
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return PKA_READ(CRYPTO_MEMORY_MAP0 + sizeof(u32) * (index));
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}
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static u32 pka_make_full_opcode(u32 opcode, u32 len_id,
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u32 is_a_immed, u32 op_a,
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u32 is_b_immed, u32 op_b,
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u32 res_discard, u32 res,
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u32 tag)
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{
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u32 full_opcode;
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full_opcode = ((opcode & 31) << CRYPTO_OPCODE_CODE_SHIFT |
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(len_id & 7) << CRYPTO_OPCODE_LEN_SHIFT |
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(is_a_immed & 1) << CRYPTO_OPCODE_A_IMMED_SHIFT |
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(op_a & 31) << CRYPTO_OPCODE_A_SHIFT |
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(is_b_immed & 1) << CRYPTO_OPCODE_B_IMMED_SHIFT |
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(op_b & 31) << CRYPTO_OPCODE_B_SHIFT |
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(res_discard & 1) << CRYPTO_OPCODE_R_DIS_SHIFT |
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(res & 31) << CRYPTO_OPCODE_R_SHIFT |
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(tag & 31) << CRYPTO_OPCODE_TAG_SHIFT);
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return full_opcode;
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}
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static void pka_load_data(u32 addr, u32 *data, u32 size_words)
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{
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pka_wait_done();
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PKA_RAM_FOR_CPU();
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pka_word_memcpy(PKA_GET_SRAM_ADDR(addr), data, size_words);
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PKA_RAM_FOR_PKA();
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}
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static void pka_clr_mem(u32 addr, u32 size_words)
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{
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pka_wait_done();
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PKA_RAM_FOR_CPU();
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pka_word_memset(PKA_GET_SRAM_ADDR(addr), 0x00, size_words);
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PKA_RAM_FOR_PKA();
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}
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static void pka_read_data(u32 addr, u32 *data, u32 size_words)
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{
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pka_wait_done();
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PKA_RAM_FOR_CPU();
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pka_word_memcpy(data, PKA_GET_SRAM_ADDR(addr), size_words);
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PKA_RAM_FOR_PKA();
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}
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static int pka_exec_op(enum pka_opcode opcode, u8 len_id,
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u8 is_a_immed, u8 op_a, u8 is_b_immed, u8 op_b,
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u8 res_discard, u8 res, u8 tag)
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{
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int ret = 0;
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u32 full_opcode;
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if (res == RES_DISCARD) {
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res_discard = 1;
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res = 0;
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}
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full_opcode = pka_make_full_opcode(opcode, len_id,
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is_a_immed, op_a,
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is_b_immed, op_b,
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res_discard, res, tag);
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/* write full opcode into PKA CRYPTO_OPCODE register */
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PKA_WRITE(full_opcode, CRYPTO_OPCODE);
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/*************************************************/
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/* finishing operations for different cases */
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/*************************************************/
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switch (opcode) {
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case PKA_OPCODE_DIV:
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/* for Div operation check, that op_b != 0*/
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if (pka_check_status(CRYPTO_PKA_DIV_BY_ZERO))
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goto end;
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break;
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case PKA_OPCODE_TERMINATE:
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/* wait for PKA done bit */
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ret = pka_wait_done();
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break;
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default:
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/* wait for PKA pipe ready bit */
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ret = pka_wait_pipe_rdy();
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}
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end:
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return ret;
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}
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static int pk_int_len_tbl(u32 exact_size_words, u32 calc_size_words)
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{
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u32 i;
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/* clear all length reg */
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for (i = 0; i < CRYPTO_LEN_REG_NUM; i++)
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pka_set_len_words(0, i);
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/* Case of default settings */
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/* write exact size into first table entry */
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pka_set_len_words(exact_size_words, PKA_EXACT_LEN_ID);
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/* write size with extra word into tab[1] = tab[0] + 32 */
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pka_set_len_words(calc_size_words, PKA_CALC_LEN_ID);
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return 0;
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}
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static int pka_int_map_tbl(u32 *regs_cnt, u32 max_size_words)
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{
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u32 i;
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u32 cur_addr = 0;
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u32 max_size_bytes, default_regs_cnt;
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max_size_bytes = PKA_WORDS2BYTES(max_size_words);
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default_regs_cnt =
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min_t(u32, CRYPTO_MAP_REG_NUM, CRYPTO_SRAM_SIZE / max_size_bytes);
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/* clear all address */
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for (i = 0; i < CRYPTO_MAP_REG_NUM; i++)
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pka_set_map_addr(PKA_ADDR_NOT_USED, i);
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/* set addresses of N,NP and user requested registers (excluding 2 temp registers T0,T1) */
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for (i = 0; i < default_regs_cnt - PKA_TMP_REG_CNT; i++, cur_addr += max_size_bytes)
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pka_set_map_addr(cur_addr, i);
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/* set addresses of 2 temp registers: T0=30, T1=31 */
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pka_set_map_addr(cur_addr, PKA_T0);
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cur_addr += max_size_bytes;
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pka_set_map_addr(cur_addr, PKA_T1);
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/* output maximal count of allowed registers */
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*regs_cnt = default_regs_cnt;
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/* set default virtual addresses of N,NP,T0,T1 registers into N_NP_T0_T1_Reg */
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PKA_WRITE((u32)PKA_N_NP_T0_T1_REG_DEFAULT, CRYPTO_N_NP_T0_T1_ADDR);
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return 0;
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}
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static int pka_clear_regs_block(u8 first_reg, u8 regs_cnt)
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{
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u32 i;
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u32 size_words;
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int cnt_tmps = 0;
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u32 user_reg_num = CRYPTO_MAP_REG_NUM - PKA_TMP_REG_CNT;
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/* calculate size_words of register in words */
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size_words = pka_get_len_words(PKA_CALC_LEN_ID);
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if (first_reg + regs_cnt > user_reg_num) {
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cnt_tmps = min_t(u8, (regs_cnt + first_reg - user_reg_num), PKA_TMP_REG_CNT);
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regs_cnt = user_reg_num;
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} else {
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cnt_tmps = PKA_TMP_REG_CNT;
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}
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/* clear ordinary registers */
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for (i = first_reg; i < regs_cnt; i++)
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RK_PKA_CLR(i);
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pka_wait_done();
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/* clear PKA temp registers (without PKA operations) */
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if (cnt_tmps > 0) {
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pka_clr_mem(pka_get_map_addr(PKA_T0), size_words);
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if (cnt_tmps > 1)
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pka_clr_mem(pka_get_map_addr(PKA_T1), size_words);
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}
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return 0;
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}
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static int pka_init(u32 exact_size_words)
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{
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int ret;
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u32 regs_cnt = 0;
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u32 calc_size_words = exact_size_words + 1;
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PKA_CLK_ENABLE();
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PKA_RAM_FOR_PKA();
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if (exact_size_words > PKA_MAX_CALC_WORDS)
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return -1;
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ret = pk_int_len_tbl(exact_size_words, calc_size_words);
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if (ret)
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goto exit;
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ret = pka_int_map_tbl(®s_cnt, calc_size_words);
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if (ret)
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goto exit;
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/* clean PKA data memory */
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pka_clear_regs_block(0, regs_cnt - PKA_TMP_REG_CNT);
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/* clean temp PKA registers 30,31 */
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pka_clr_mem(pka_get_map_addr(PKA_T0), calc_size_words);
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pka_clr_mem(pka_get_map_addr(PKA_T1), calc_size_words);
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exit:
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return ret;
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}
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static void pka_finish(void)
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{
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RK_PKA_TERMINATE();
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PKA_CLK_DISABLE();
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}
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static void pka_copy_bn_into_reg(u8 dst_reg, struct rk_bignum *bn)
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{
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u32 cur_addr;
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u32 size_words, bn_words;
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RK_PKA_TERMINATE();
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bn_words = PKA_BIGNUM_WORDS(bn);
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size_words = pka_get_len_words(PKA_CALC_LEN_ID);
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cur_addr = pka_get_map_addr(dst_reg);
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pka_load_data(cur_addr, bn->data, bn_words);
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cur_addr += PKA_WORDS2BYTES(bn_words);
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pka_clr_mem(cur_addr, size_words - bn_words);
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}
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static int pka_copy_bn_from_reg(struct rk_bignum *bn, u32 size_words, u8 src_reg, bool is_max_poll)
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{
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int ret;
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PKA_WRITE(0, CRYPTO_OPCODE);
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ret = is_max_poll ? pka_max_wait_done() : pka_wait_done();
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if (ret)
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return ret;
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pka_read_data(pka_get_map_addr(src_reg), bn->data, size_words);
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return 0;
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}
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/*********** pka_div_bignum function **********************/
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/**
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* @brief The function divides long number A*(2^S) by B:
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* res = A*(2^S) / B, remainder A = A*(2^S) % B.
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* where: A,B - are numbers of size, which is not grate than,
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* maximal operands size,
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* and B > 2^S;
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* S - exponent of binary factor of A.
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* ^ - exponentiation operator.
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*
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* The function algorithm:
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*
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* 1. Let nWords = S/32; nBits = S % 32;
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* 2. Set res = 0, r_t1 = op_a;
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* 3. for(i=0; i<=nWords; i++) do:
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* 3.1. if(i < nWords )
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* s1 = 32;
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* else
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* s1 = nBits;
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* 3.2. r_t1 = r_t1 << s1;
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* 3.3. call PKA_div for calculating the quotient and remainder:
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* r_t2 = floor(r_t1/op_b) //quotient;
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* r_t1 = r_t1 % op_b //remainder (is in r_t1 register);
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* 3.4. res = (res << s1) + r_t2;
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* end do;
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* 4. Exit.
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*
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* Assuming:
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* - 5 PKA registers are used: op_a, op_b, res, r_t1, r_t2.
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* - The registers sizes and mapping tables are set on
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* default mode according to operands size.
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* - The PKA clocks are initialized.
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* NOTE ! Operand op_a shall be overwritten by remainder.
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*
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* @param[in] len_id - ID of operation size (modSize+32).
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* @param[in] op_a - Operand A: virtual register pointer of A.
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* @param[in] S - exponent of binary factor of A.
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* @param[in] op_b - Operand B: virtual register pointer of B.
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* @param[in] res - Virtual register pointer for result quotient.
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* @param[in] r_t1 - Virtual pointer to remainder.
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* @param[in] r_t2 - Virtual pointer of temp register.
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*
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* @return int - On success 0 is returned:
|
*
|
*/
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static int pka_div_bignum(u8 op_a, u32 s, u8 op_b, u8 res, u8 r_t1, u8 r_t2)
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{
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u8 s1;
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u32 i;
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u32 n_bits, n_words;
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/* calculate shifting parameters (words and bits ) */
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n_words = ((u32)s + 31) / 32;
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n_bits = (u32)s % 32;
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/* copy operand op_a (including extra word) into temp reg r_t1 */
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RK_PKA_COPY(r_t1, op_a);
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/* set res = 0 (including extra word) */
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RK_PKA_CLR(res);
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/*----------------------------------------------------*/
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/* Step 1. Shifting and dividing loop */
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/*----------------------------------------------------*/
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for (i = 0; i < n_words; i++) {
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/* 3.1 set shift value s1 */
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s1 = i > 0 ? 32 : n_bits;
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|
/* 3.2. shift: r_t1 = r_t1 * 2**s1 (in code (s1-1),
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* because PKA performs s+1 shifts)
|
*/
|
if (s1 > 0)
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RK_PKA_SHL0(r_t1 /*op_a*/, (s1 - 1) /*s*/, r_t1 /*res*/);
|
|
/* 3.3. perform PKA_OPCODE_MOD_DIV for calculating a quotient
|
* r_t2 = floor(r_t1 / N)
|
* and remainder r_t1 = r_t1 % op_b
|
*/
|
RK_PKA_DIV(r_t1 /*op_a*/, op_b /*B*/, r_t2 /*res*/);
|
|
/* 3.4. res = res * 2**s1 + res; */
|
if (s1 > 0)
|
RK_PKA_SHL0(res /*op_a*/, (s1 - 1) /*s*/, res /*res*/);
|
|
RK_PKA_ADD(res /*op_a*/, r_t2 /*op_b*/, res /*res*/);
|
}
|
|
pka_wait_done();
|
|
return 0;
|
} /* END OF pka_div_bignum */
|
|
static u32 pka_calc_and_init_np(struct rk_bignum *bn, u8 r_t0, u8 r_t1, u8 r_t2)
|
{
|
int ret;
|
u32 i;
|
u32 s;
|
u32 mod_size_bits;
|
u32 num_bits, num_words;
|
|
/* Set s = 132 */
|
s = 132;
|
|
mod_size_bits = PKA_BYTES2BITS(rk_bn_get_size(bn));
|
|
CRYPTO_TRACE("size_bits = %u", mod_size_bits);
|
|
/* copy modulus N into r0 register */
|
pka_copy_bn_into_reg(PKA_N, bn);
|
|
/*--------------------------------------------------------------*/
|
/* Step 1,2. Set registers: Set op_a = 2^(sizeN+32) */
|
/* Registers using: 0 - N (is set in register 0, */
|
/* 1 - NP, temp regs: r_t0 (A), r_t1, r_t2. */
|
/* len_id: 0 - exact size, 1 - exact+32 bit */
|
/*--------------------------------------------------------------*/
|
|
/* set register r_t0 = 0 */
|
RK_PKA_CLR(r_t0);
|
|
/* calculate bit position of said bit in the word */
|
num_bits = mod_size_bits % 32;
|
num_words = mod_size_bits / 32;
|
|
CRYPTO_TRACE("num_bits = %u, num_words = %u, size_bits = %u",
|
num_bits, num_words, mod_size_bits);
|
|
/* set 1 into register r_t0 */
|
RK_PKA_SET_0(r_t0 /*op_a*/, r_t0 /*res*/);
|
|
/* shift 1 to num_bits+31 position */
|
if (num_bits > 0)
|
RK_PKA_SHL0(r_t0 /*op_a*/, num_bits - 1 /*s*/, r_t0 /*res*/);
|
|
/* shift to word position */
|
for (i = 0; i < num_words; i++)
|
RK_PKA_SHL0(r_t0 /*op_a*/, 31 /*s*/, r_t0 /*res*/);
|
|
/*--------------------------------------------------------------*/
|
/* Step 3. Dividing: PKA_NP = (r_t0 * 2**s) / N */
|
/*--------------------------------------------------------------*/
|
ret = pka_div_bignum(r_t0, s, PKA_N, PKA_NP, r_t1, r_t2);
|
|
return ret;
|
} /* END OF pka_calc_and_init_np */
|
|
/********************* Public Function Definition ****************************/
|
|
void rk_pka_set_crypto_base(void __iomem *base)
|
{
|
pka_base = base;
|
}
|
|
/**
|
* @brief calculate exp mod. out = in ^ e mod n
|
* @param in: the point of input data bignum.
|
* @param e: the point of exponent bignum.
|
* @param n: the point of modulus bignum.
|
* @param out: the point of outputs bignum.
|
* @param pTmp: the point of tmpdata bignum.
|
* @return 0 for success
|
*/
|
int rk_pka_expt_mod(struct rk_bignum *in,
|
struct rk_bignum *e,
|
struct rk_bignum *n,
|
struct rk_bignum *out)
|
{
|
int ret = -1;
|
u32 max_word_size;
|
bool is_max_poll;
|
u8 r_in = 2, r_e = 3, r_out = 4;
|
u8 r_t0 = 2, r_t1 = 3, r_t2 = 4;
|
|
if (!in || !e || !n || !out || PKA_BIGNUM_WORDS(n) == 0)
|
return -1;
|
|
max_word_size = PKA_BIGNUM_WORDS(n);
|
|
ret = pka_init(max_word_size);
|
if (ret) {
|
CRYPTO_TRACE("pka_init error\n");
|
goto exit;
|
}
|
|
/* calculate NP by initialization PKA for modular operations */
|
ret = pka_calc_and_init_np(n, r_t0, r_t1, r_t2);
|
if (ret) {
|
CRYPTO_TRACE("pka_calc_and_init_np error\n");
|
goto exit;
|
}
|
|
pka_clear_regs_block(r_in, 3);
|
|
pka_copy_bn_into_reg(r_in, in);
|
pka_copy_bn_into_reg(r_e, e);
|
pka_copy_bn_into_reg(PKA_N, n);
|
|
ret = RK_PKA_MOD_EXP(r_in, r_e, r_out);
|
if (ret) {
|
CRYPTO_TRACE("RK_PKA_MOD_EXP error\n");
|
goto exit;
|
}
|
|
/* e is usually 0x10001 in public key EXP_MOD operation */
|
is_max_poll = rk_bn_highest_bit(e) * 2 > rk_bn_highest_bit(n) ? true : false;
|
|
ret = pka_copy_bn_from_reg(out, max_word_size, r_out, is_max_poll);
|
|
exit:
|
pka_clear_regs_block(0, 5);
|
pka_clear_regs_block(30, 2);
|
pka_finish();
|
|
return ret;
|
}
|
