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Miller" , Maxime Coquelin , Alexandre Torgue CC: Marek Vasut , Nicolas Toromanoff , Ard Biesheuvel , , , , Subject: [PATCH v2 8/8] crypto: stm32/cryp - reorder hw initialization Date: Tue, 2 Nov 2021 17:47:29 +0100 Message-ID: <20211102164729.9957-9-nicolas.toromanoff@foss.st.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20211102164729.9957-1-nicolas.toromanoff@foss.st.com> References: <20211102164729.9957-1-nicolas.toromanoff@foss.st.com> MIME-Version: 1.0 X-Originating-IP: [10.75.127.46] X-ClientProxiedBy: SFHDAG2NODE2.st.com (10.75.127.5) To SFHDAG2NODE2.st.com (10.75.127.5) X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.182.1,Aquarius:18.0.790,Hydra:6.0.425,FMLib:17.0.607.475 definitions=2021-11-02_08,2021-11-02_01,2020-04-07_01 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211102_094931_242302_54A8E948 X-CRM114-Status: GOOD ( 19.22 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The CRYP IP checks the written key depending of the configuration, it's safer to write the whole configuration to hardware then the key to avoid unexpected key rejection. Signed-off-by: Nicolas Toromanoff --- drivers/crypto/stm32/stm32-cryp.c | 39 ++++++++++++++++++++----------- 1 file changed, 26 insertions(+), 13 deletions(-) diff --git a/drivers/crypto/stm32/stm32-cryp.c b/drivers/crypto/stm32/stm32-cryp.c index 5962fbb0bc91..d99eea9cb8cd 100644 --- a/drivers/crypto/stm32/stm32-cryp.c +++ b/drivers/crypto/stm32/stm32-cryp.c @@ -232,6 +232,11 @@ static inline int stm32_cryp_wait_busy(struct stm32_cryp *cryp) !(status & SR_BUSY), 10, 100000); } +static inline void stm32_cryp_enable(struct stm32_cryp *cryp) +{ + writel_relaxed(readl_relaxed(cryp->regs + CRYP_CR) | CR_CRYPEN, cryp->regs + CRYP_CR); +} + static inline int stm32_cryp_wait_enable(struct stm32_cryp *cryp) { u32 status; @@ -534,9 +539,6 @@ static int stm32_cryp_hw_init(struct stm32_cryp *cryp) /* Disable interrupt */ stm32_cryp_write(cryp, CRYP_IMSCR, 0); - /* Set key */ - stm32_cryp_hw_write_key(cryp); - /* Set configuration */ cfg = CR_DATA8 | CR_FFLUSH; @@ -562,23 +564,36 @@ static int stm32_cryp_hw_init(struct stm32_cryp *cryp) /* AES ECB/CBC decrypt: run key preparation first */ if (is_decrypt(cryp) && ((hw_mode == CR_AES_ECB) || (hw_mode == CR_AES_CBC))) { - stm32_cryp_write(cryp, CRYP_CR, cfg | CR_AES_KP | CR_CRYPEN); + /* Configure in key preparation mode */ + stm32_cryp_write(cryp, CRYP_CR, cfg | CR_AES_KP); + /* Set key only after full configuration done */ + stm32_cryp_hw_write_key(cryp); + + /* Start prepare key */ + stm32_cryp_enable(cryp); /* Wait for end of processing */ ret = stm32_cryp_wait_busy(cryp); if (ret) { dev_err(cryp->dev, "Timeout (key preparation)\n"); return ret; } - } - cfg |= hw_mode; + cfg |= hw_mode | CR_DEC_NOT_ENC; - if (is_decrypt(cryp)) - cfg |= CR_DEC_NOT_ENC; + /* Apply updated config (Decrypt + algo) and flush */ + stm32_cryp_write(cryp, CRYP_CR, cfg); + } else { + cfg |= hw_mode; + if (is_decrypt(cryp)) + cfg |= CR_DEC_NOT_ENC; - /* Apply config and flush (valid when CRYPEN = 0) */ - stm32_cryp_write(cryp, CRYP_CR, cfg); + /* Apply config and flush */ + stm32_cryp_write(cryp, CRYP_CR, cfg); + + /* Set key only after configuration done */ + stm32_cryp_hw_write_key(cryp); + } switch (hw_mode) { case CR_AES_GCM: @@ -606,9 +621,7 @@ static int stm32_cryp_hw_init(struct stm32_cryp *cryp) } /* Enable now */ - cfg |= CR_CRYPEN; - - stm32_cryp_write(cryp, CRYP_CR, cfg); + stm32_cryp_enable(cryp); return 0; }