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crypto: stm32/cryp - enable for use with Ux500
This adds a few small quirks to handle the differences between the STM32 and Ux500 cryp blocks. The following differences are handled with special bool switch bits in the capabilities: - The main difference is that some registers are removed, so we add register offsets for all registers in the per-variant data. Then we assign the right offsets for Ux500 vs the STM32 variants. - The Ux500 does not support the aeads algorithms; gcm(aes) and ccm(aes). Avoid registering them when running on Ux500. - The Ux500 has a special "linear" key format and does some elaborare bit swizzling of the key bits before writing them into the key registers. This is written as an "application note" inside the DB8500 design specification, and seems to be the result of some mishap when assigning the data lines to register bits. (STM32 has clearly fixed this.) - The Ux500 does not have the KP "key prepare" bit in the CR register. Instead, we need to set the KSE bit, "key schedule encryption" bit which does the same thing but is in bit 11 rather than being a special "algorithm type" as on STM32. The algorithm must however be specified as AES ECB while doing this. - The Ux500 cannot just read out IV registers, we need to set the KEYRDEN "key read enable" bit, as this protects not just the key but also the IV from being read out. Enable this bit before reading out the IV and disable it afterwards. Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com> Cc: Alexandre Torgue <alexandre.torgue@foss.st.com> Acked by: Lionel Debieve <lionel.debieve@foss.st.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Linus Walleij
Herbert Xu
parent
fe867538c1
commit
0b496efbd2
@ -2,6 +2,7 @@
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/*
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* Copyright (C) STMicroelectronics SA 2017
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* Author: Fabien Dessenne <fabien.dessenne@st.com>
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* Ux500 support taken from snippets in the old Ux500 cryp driver
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*/
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#include <linux/clk.h>
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@ -62,6 +63,29 @@
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#define CRYP_CSGCMCCM0R 0x00000050
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#define CRYP_CSGCM0R 0x00000070
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#define UX500_CRYP_CR 0x00000000
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#define UX500_CRYP_SR 0x00000004
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#define UX500_CRYP_DIN 0x00000008
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#define UX500_CRYP_DINSIZE 0x0000000C
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#define UX500_CRYP_DOUT 0x00000010
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#define UX500_CRYP_DOUSIZE 0x00000014
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#define UX500_CRYP_DMACR 0x00000018
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#define UX500_CRYP_IMSC 0x0000001C
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#define UX500_CRYP_RIS 0x00000020
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#define UX500_CRYP_MIS 0x00000024
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#define UX500_CRYP_K1L 0x00000028
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#define UX500_CRYP_K1R 0x0000002C
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#define UX500_CRYP_K2L 0x00000030
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#define UX500_CRYP_K2R 0x00000034
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#define UX500_CRYP_K3L 0x00000038
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#define UX500_CRYP_K3R 0x0000003C
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#define UX500_CRYP_K4L 0x00000040
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#define UX500_CRYP_K4R 0x00000044
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#define UX500_CRYP_IV0L 0x00000048
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#define UX500_CRYP_IV0R 0x0000004C
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#define UX500_CRYP_IV1L 0x00000050
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#define UX500_CRYP_IV1R 0x00000054
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/* Registers values */
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#define CR_DEC_NOT_ENC 0x00000004
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#define CR_TDES_ECB 0x00000000
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@ -71,7 +95,8 @@
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#define CR_AES_ECB 0x00000020
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#define CR_AES_CBC 0x00000028
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#define CR_AES_CTR 0x00000030
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#define CR_AES_KP 0x00000038
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#define CR_AES_KP 0x00000038 /* Not on Ux500 */
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#define CR_AES_XTS 0x00000038 /* Only on Ux500 */
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#define CR_AES_GCM 0x00080000
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#define CR_AES_CCM 0x00080008
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#define CR_AES_UNKNOWN 0xFFFFFFFF
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@ -83,6 +108,8 @@
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#define CR_KEY128 0x00000000
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#define CR_KEY192 0x00000100
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#define CR_KEY256 0x00000200
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#define CR_KEYRDEN 0x00000400 /* Only on Ux500 */
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#define CR_KSE 0x00000800 /* Only on Ux500 */
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#define CR_FFLUSH 0x00004000
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#define CR_CRYPEN 0x00008000
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#define CR_PH_INIT 0x00000000
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@ -107,8 +134,25 @@
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#define CRYP_AUTOSUSPEND_DELAY 50
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struct stm32_cryp_caps {
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bool swap_final;
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bool padding_wa;
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bool aeads_support;
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bool linear_aes_key;
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bool kp_mode;
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bool iv_protection;
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bool swap_final;
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bool padding_wa;
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u32 cr;
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u32 sr;
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u32 din;
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u32 dout;
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u32 imsc;
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u32 mis;
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u32 k1l;
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u32 k1r;
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u32 k3r;
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u32 iv0l;
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u32 iv0r;
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u32 iv1l;
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u32 iv1r;
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};
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struct stm32_cryp_ctx {
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@ -228,20 +272,21 @@ static inline int stm32_cryp_wait_busy(struct stm32_cryp *cryp)
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{
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u32 status;
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return readl_relaxed_poll_timeout(cryp->regs + CRYP_SR, status,
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return readl_relaxed_poll_timeout(cryp->regs + cryp->caps->sr, status,
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!(status & SR_BUSY), 10, 100000);
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}
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static inline void stm32_cryp_enable(struct stm32_cryp *cryp)
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{
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writel_relaxed(readl_relaxed(cryp->regs + CRYP_CR) | CR_CRYPEN, cryp->regs + CRYP_CR);
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writel_relaxed(readl_relaxed(cryp->regs + cryp->caps->cr) | CR_CRYPEN,
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cryp->regs + cryp->caps->cr);
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}
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static inline int stm32_cryp_wait_enable(struct stm32_cryp *cryp)
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{
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u32 status;
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return readl_relaxed_poll_timeout(cryp->regs + CRYP_CR, status,
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return readl_relaxed_poll_timeout(cryp->regs + cryp->caps->cr, status,
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!(status & CR_CRYPEN), 10, 100000);
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}
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@ -249,10 +294,22 @@ static inline int stm32_cryp_wait_output(struct stm32_cryp *cryp)
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{
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u32 status;
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return readl_relaxed_poll_timeout(cryp->regs + CRYP_SR, status,
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return readl_relaxed_poll_timeout(cryp->regs + cryp->caps->sr, status,
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status & SR_OFNE, 10, 100000);
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}
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static inline void stm32_cryp_key_read_enable(struct stm32_cryp *cryp)
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{
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writel_relaxed(readl_relaxed(cryp->regs + cryp->caps->cr) | CR_KEYRDEN,
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cryp->regs + cryp->caps->cr);
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}
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static inline void stm32_cryp_key_read_disable(struct stm32_cryp *cryp)
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{
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writel_relaxed(readl_relaxed(cryp->regs + cryp->caps->cr) & ~CR_KEYRDEN,
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cryp->regs + cryp->caps->cr);
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}
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static int stm32_cryp_read_auth_tag(struct stm32_cryp *cryp);
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static void stm32_cryp_finish_req(struct stm32_cryp *cryp, int err);
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@ -281,12 +338,12 @@ static void stm32_cryp_hw_write_iv(struct stm32_cryp *cryp, __be32 *iv)
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if (!iv)
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return;
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stm32_cryp_write(cryp, CRYP_IV0LR, be32_to_cpu(*iv++));
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stm32_cryp_write(cryp, CRYP_IV0RR, be32_to_cpu(*iv++));
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stm32_cryp_write(cryp, cryp->caps->iv0l, be32_to_cpu(*iv++));
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stm32_cryp_write(cryp, cryp->caps->iv0r, be32_to_cpu(*iv++));
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if (is_aes(cryp)) {
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stm32_cryp_write(cryp, CRYP_IV1LR, be32_to_cpu(*iv++));
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stm32_cryp_write(cryp, CRYP_IV1RR, be32_to_cpu(*iv++));
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stm32_cryp_write(cryp, cryp->caps->iv1l, be32_to_cpu(*iv++));
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stm32_cryp_write(cryp, cryp->caps->iv1r, be32_to_cpu(*iv++));
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}
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}
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@ -298,12 +355,102 @@ static void stm32_cryp_get_iv(struct stm32_cryp *cryp)
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if (!tmp)
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return;
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*tmp++ = cpu_to_be32(stm32_cryp_read(cryp, CRYP_IV0LR));
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*tmp++ = cpu_to_be32(stm32_cryp_read(cryp, CRYP_IV0RR));
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if (cryp->caps->iv_protection)
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stm32_cryp_key_read_enable(cryp);
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*tmp++ = cpu_to_be32(stm32_cryp_read(cryp, cryp->caps->iv0l));
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*tmp++ = cpu_to_be32(stm32_cryp_read(cryp, cryp->caps->iv0r));
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if (is_aes(cryp)) {
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*tmp++ = cpu_to_be32(stm32_cryp_read(cryp, CRYP_IV1LR));
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*tmp++ = cpu_to_be32(stm32_cryp_read(cryp, CRYP_IV1RR));
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*tmp++ = cpu_to_be32(stm32_cryp_read(cryp, cryp->caps->iv1l));
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*tmp++ = cpu_to_be32(stm32_cryp_read(cryp, cryp->caps->iv1r));
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}
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if (cryp->caps->iv_protection)
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stm32_cryp_key_read_disable(cryp);
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}
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/**
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* ux500_swap_bits_in_byte() - mirror the bits in a byte
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* @b: the byte to be mirrored
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*
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* The bits are swapped the following way:
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* Byte b include bits 0-7, nibble 1 (n1) include bits 0-3 and
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* nibble 2 (n2) bits 4-7.
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*
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* Nibble 1 (n1):
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* (The "old" (moved) bit is replaced with a zero)
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* 1. Move bit 6 and 7, 4 positions to the left.
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* 2. Move bit 3 and 5, 2 positions to the left.
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* 3. Move bit 1-4, 1 position to the left.
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*
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* Nibble 2 (n2):
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* 1. Move bit 0 and 1, 4 positions to the right.
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* 2. Move bit 2 and 4, 2 positions to the right.
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* 3. Move bit 3-6, 1 position to the right.
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*
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* Combine the two nibbles to a complete and swapped byte.
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*/
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static inline u8 ux500_swap_bits_in_byte(u8 b)
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{
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#define R_SHIFT_4_MASK 0xc0 /* Bits 6 and 7, right shift 4 */
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#define R_SHIFT_2_MASK 0x28 /* (After right shift 4) Bits 3 and 5,
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right shift 2 */
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#define R_SHIFT_1_MASK 0x1e /* (After right shift 2) Bits 1-4,
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right shift 1 */
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#define L_SHIFT_4_MASK 0x03 /* Bits 0 and 1, left shift 4 */
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#define L_SHIFT_2_MASK 0x14 /* (After left shift 4) Bits 2 and 4,
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left shift 2 */
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#define L_SHIFT_1_MASK 0x78 /* (After left shift 1) Bits 3-6,
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left shift 1 */
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u8 n1;
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u8 n2;
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/* Swap most significant nibble */
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/* Right shift 4, bits 6 and 7 */
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n1 = ((b & R_SHIFT_4_MASK) >> 4) | (b & ~(R_SHIFT_4_MASK >> 4));
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/* Right shift 2, bits 3 and 5 */
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n1 = ((n1 & R_SHIFT_2_MASK) >> 2) | (n1 & ~(R_SHIFT_2_MASK >> 2));
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/* Right shift 1, bits 1-4 */
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n1 = (n1 & R_SHIFT_1_MASK) >> 1;
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/* Swap least significant nibble */
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/* Left shift 4, bits 0 and 1 */
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n2 = ((b & L_SHIFT_4_MASK) << 4) | (b & ~(L_SHIFT_4_MASK << 4));
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/* Left shift 2, bits 2 and 4 */
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n2 = ((n2 & L_SHIFT_2_MASK) << 2) | (n2 & ~(L_SHIFT_2_MASK << 2));
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/* Left shift 1, bits 3-6 */
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n2 = (n2 & L_SHIFT_1_MASK) << 1;
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return n1 | n2;
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}
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/**
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* ux500_swizzle_key() - Shuffle around words and bits in the AES key
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* @in: key to swizzle
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* @out: swizzled key
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* @len: length of key, in bytes
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*
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* This "key swizzling procedure" is described in the examples in the
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* DB8500 design specification. There is no real description of why
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* the bits have been arranged like this in the hardware.
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*/
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static inline void ux500_swizzle_key(const u8 *in, u8 *out, u32 len)
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{
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int i = 0;
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int bpw = sizeof(u32);
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int j;
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int index = 0;
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j = len - bpw;
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while (j >= 0) {
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for (i = 0; i < bpw; i++) {
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index = len - j - bpw + i;
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out[j + i] =
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ux500_swap_bits_in_byte(in[index]);
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}
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j -= bpw;
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}
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}
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@ -313,14 +460,33 @@ static void stm32_cryp_hw_write_key(struct stm32_cryp *c)
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int r_id;
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if (is_des(c)) {
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stm32_cryp_write(c, CRYP_K1LR, be32_to_cpu(c->ctx->key[0]));
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stm32_cryp_write(c, CRYP_K1RR, be32_to_cpu(c->ctx->key[1]));
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} else {
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r_id = CRYP_K3RR;
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for (i = c->ctx->keylen / sizeof(u32); i > 0; i--, r_id -= 4)
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stm32_cryp_write(c, r_id,
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be32_to_cpu(c->ctx->key[i - 1]));
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stm32_cryp_write(c, c->caps->k1l, be32_to_cpu(c->ctx->key[0]));
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stm32_cryp_write(c, c->caps->k1r, be32_to_cpu(c->ctx->key[1]));
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return;
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}
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/*
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* On the Ux500 the AES key is considered as a single bit sequence
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* of 128, 192 or 256 bits length. It is written linearly into the
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* registers from K1L and down, and need to be processed to become
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* a proper big-endian bit sequence.
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*/
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if (is_aes(c) && c->caps->linear_aes_key) {
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u32 tmpkey[8];
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ux500_swizzle_key((u8 *)c->ctx->key,
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(u8 *)tmpkey, c->ctx->keylen);
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r_id = c->caps->k1l;
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for (i = 0; i < c->ctx->keylen / sizeof(u32); i++, r_id += 4)
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stm32_cryp_write(c, r_id, tmpkey[i]);
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return;
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}
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r_id = c->caps->k3r;
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for (i = c->ctx->keylen / sizeof(u32); i > 0; i--, r_id -= 4)
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stm32_cryp_write(c, r_id, be32_to_cpu(c->ctx->key[i - 1]));
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}
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static u32 stm32_cryp_get_hw_mode(struct stm32_cryp *cryp)
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@ -373,7 +539,7 @@ static int stm32_cryp_gcm_init(struct stm32_cryp *cryp, u32 cfg)
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cryp->gcm_ctr = GCM_CTR_INIT;
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stm32_cryp_hw_write_iv(cryp, iv);
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stm32_cryp_write(cryp, CRYP_CR, cfg | CR_PH_INIT | CR_CRYPEN);
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stm32_cryp_write(cryp, cryp->caps->cr, cfg | CR_PH_INIT | CR_CRYPEN);
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/* Wait for end of processing */
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ret = stm32_cryp_wait_enable(cryp);
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@ -385,10 +551,10 @@ static int stm32_cryp_gcm_init(struct stm32_cryp *cryp, u32 cfg)
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/* Prepare next phase */
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if (cryp->areq->assoclen) {
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cfg |= CR_PH_HEADER;
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stm32_cryp_write(cryp, CRYP_CR, cfg);
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stm32_cryp_write(cryp, cryp->caps->cr, cfg);
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} else if (stm32_cryp_get_input_text_len(cryp)) {
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cfg |= CR_PH_PAYLOAD;
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stm32_cryp_write(cryp, CRYP_CR, cfg);
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stm32_cryp_write(cryp, cryp->caps->cr, cfg);
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}
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return 0;
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@ -405,20 +571,20 @@ static void stm32_crypt_gcmccm_end_header(struct stm32_cryp *cryp)
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err = stm32_cryp_wait_busy(cryp);
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if (err) {
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dev_err(cryp->dev, "Timeout (gcm/ccm header)\n");
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stm32_cryp_write(cryp, CRYP_IMSCR, 0);
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stm32_cryp_write(cryp, cryp->caps->imsc, 0);
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stm32_cryp_finish_req(cryp, err);
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return;
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}
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if (stm32_cryp_get_input_text_len(cryp)) {
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/* Phase 3 : payload */
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cfg = stm32_cryp_read(cryp, CRYP_CR);
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cfg = stm32_cryp_read(cryp, cryp->caps->cr);
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cfg &= ~CR_CRYPEN;
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stm32_cryp_write(cryp, CRYP_CR, cfg);
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stm32_cryp_write(cryp, cryp->caps->cr, cfg);
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cfg &= ~CR_PH_MASK;
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cfg |= CR_PH_PAYLOAD | CR_CRYPEN;
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stm32_cryp_write(cryp, CRYP_CR, cfg);
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stm32_cryp_write(cryp, cryp->caps->cr, cfg);
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} else {
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/*
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* Phase 4 : tag.
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@ -458,7 +624,7 @@ static void stm32_cryp_write_ccm_first_header(struct stm32_cryp *cryp)
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scatterwalk_copychunks((char *)block + len, &cryp->in_walk, written, 0);
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for (i = 0; i < AES_BLOCK_32; i++)
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stm32_cryp_write(cryp, CRYP_DIN, block[i]);
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stm32_cryp_write(cryp, cryp->caps->din, block[i]);
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cryp->header_in -= written;
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@ -494,7 +660,7 @@ static int stm32_cryp_ccm_init(struct stm32_cryp *cryp, u32 cfg)
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b0[AES_BLOCK_SIZE - 1] = textlen & 0xFF;
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/* Enable HW */
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stm32_cryp_write(cryp, CRYP_CR, cfg | CR_PH_INIT | CR_CRYPEN);
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||||
stm32_cryp_write(cryp, cryp->caps->cr, cfg | CR_PH_INIT | CR_CRYPEN);
|
||||
|
||||
/* Write B0 */
|
||||
d = (u32 *)b0;
|
||||
@ -505,7 +671,7 @@ static int stm32_cryp_ccm_init(struct stm32_cryp *cryp, u32 cfg)
|
||||
|
||||
if (!cryp->caps->padding_wa)
|
||||
xd = be32_to_cpu(bd[i]);
|
||||
stm32_cryp_write(cryp, CRYP_DIN, xd);
|
||||
stm32_cryp_write(cryp, cryp->caps->din, xd);
|
||||
}
|
||||
|
||||
/* Wait for end of processing */
|
||||
@ -518,13 +684,13 @@ static int stm32_cryp_ccm_init(struct stm32_cryp *cryp, u32 cfg)
|
||||
/* Prepare next phase */
|
||||
if (cryp->areq->assoclen) {
|
||||
cfg |= CR_PH_HEADER | CR_CRYPEN;
|
||||
stm32_cryp_write(cryp, CRYP_CR, cfg);
|
||||
stm32_cryp_write(cryp, cryp->caps->cr, cfg);
|
||||
|
||||
/* Write first (special) block (may move to next phase [payload]) */
|
||||
stm32_cryp_write_ccm_first_header(cryp);
|
||||
} else if (stm32_cryp_get_input_text_len(cryp)) {
|
||||
cfg |= CR_PH_PAYLOAD;
|
||||
stm32_cryp_write(cryp, CRYP_CR, cfg);
|
||||
stm32_cryp_write(cryp, cryp->caps->cr, cfg);
|
||||
}
|
||||
|
||||
return 0;
|
||||
@ -538,7 +704,7 @@ static int stm32_cryp_hw_init(struct stm32_cryp *cryp)
|
||||
pm_runtime_get_sync(cryp->dev);
|
||||
|
||||
/* Disable interrupt */
|
||||
stm32_cryp_write(cryp, CRYP_IMSCR, 0);
|
||||
stm32_cryp_write(cryp, cryp->caps->imsc, 0);
|
||||
|
||||
/* Set configuration */
|
||||
cfg = CR_DATA8 | CR_FFLUSH;
|
||||
@ -566,7 +732,12 @@ static int stm32_cryp_hw_init(struct stm32_cryp *cryp)
|
||||
if (is_decrypt(cryp) &&
|
||||
((hw_mode == CR_AES_ECB) || (hw_mode == CR_AES_CBC))) {
|
||||
/* Configure in key preparation mode */
|
||||
stm32_cryp_write(cryp, CRYP_CR, cfg | CR_AES_KP);
|
||||
if (cryp->caps->kp_mode)
|
||||
stm32_cryp_write(cryp, cryp->caps->cr,
|
||||
cfg | CR_AES_KP);
|
||||
else
|
||||
stm32_cryp_write(cryp,
|
||||
cryp->caps->cr, cfg | CR_AES_ECB | CR_KSE);
|
||||
|
||||
/* Set key only after full configuration done */
|
||||
stm32_cryp_hw_write_key(cryp);
|
||||
@ -583,14 +754,14 @@ static int stm32_cryp_hw_init(struct stm32_cryp *cryp)
|
||||
cfg |= hw_mode | CR_DEC_NOT_ENC;
|
||||
|
||||
/* Apply updated config (Decrypt + algo) and flush */
|
||||
stm32_cryp_write(cryp, CRYP_CR, cfg);
|
||||
stm32_cryp_write(cryp, cryp->caps->cr, cfg);
|
||||
} else {
|
||||
cfg |= hw_mode;
|
||||
if (is_decrypt(cryp))
|
||||
cfg |= CR_DEC_NOT_ENC;
|
||||
|
||||
/* Apply config and flush */
|
||||
stm32_cryp_write(cryp, CRYP_CR, cfg);
|
||||
stm32_cryp_write(cryp, cryp->caps->cr, cfg);
|
||||
|
||||
/* Set key only after configuration done */
|
||||
stm32_cryp_hw_write_key(cryp);
|
||||
@ -649,7 +820,7 @@ static void stm32_cryp_finish_req(struct stm32_cryp *cryp, int err)
|
||||
static int stm32_cryp_cpu_start(struct stm32_cryp *cryp)
|
||||
{
|
||||
/* Enable interrupt and let the IRQ handler do everything */
|
||||
stm32_cryp_write(cryp, CRYP_IMSCR, IMSCR_IN | IMSCR_OUT);
|
||||
stm32_cryp_write(cryp, cryp->caps->imsc, IMSCR_IN | IMSCR_OUT);
|
||||
|
||||
return 0;
|
||||
}
|
||||
@ -1137,14 +1308,14 @@ static int stm32_cryp_read_auth_tag(struct stm32_cryp *cryp)
|
||||
int ret = 0;
|
||||
|
||||
/* Update Config */
|
||||
cfg = stm32_cryp_read(cryp, CRYP_CR);
|
||||
cfg = stm32_cryp_read(cryp, cryp->caps->cr);
|
||||
|
||||
cfg &= ~CR_PH_MASK;
|
||||
cfg |= CR_PH_FINAL;
|
||||
cfg &= ~CR_DEC_NOT_ENC;
|
||||
cfg |= CR_CRYPEN;
|
||||
|
||||
stm32_cryp_write(cryp, CRYP_CR, cfg);
|
||||
stm32_cryp_write(cryp, cryp->caps->cr, cfg);
|
||||
|
||||
if (is_gcm(cryp)) {
|
||||
/* GCM: write aad and payload size (in bits) */
|
||||
@ -1152,8 +1323,8 @@ static int stm32_cryp_read_auth_tag(struct stm32_cryp *cryp)
|
||||
if (cryp->caps->swap_final)
|
||||
size_bit = (__force u32)cpu_to_be32(size_bit);
|
||||
|
||||
stm32_cryp_write(cryp, CRYP_DIN, 0);
|
||||
stm32_cryp_write(cryp, CRYP_DIN, size_bit);
|
||||
stm32_cryp_write(cryp, cryp->caps->din, 0);
|
||||
stm32_cryp_write(cryp, cryp->caps->din, size_bit);
|
||||
|
||||
size_bit = is_encrypt(cryp) ? cryp->areq->cryptlen :
|
||||
cryp->areq->cryptlen - cryp->authsize;
|
||||
@ -1161,8 +1332,8 @@ static int stm32_cryp_read_auth_tag(struct stm32_cryp *cryp)
|
||||
if (cryp->caps->swap_final)
|
||||
size_bit = (__force u32)cpu_to_be32(size_bit);
|
||||
|
||||
stm32_cryp_write(cryp, CRYP_DIN, 0);
|
||||
stm32_cryp_write(cryp, CRYP_DIN, size_bit);
|
||||
stm32_cryp_write(cryp, cryp->caps->din, 0);
|
||||
stm32_cryp_write(cryp, cryp->caps->din, size_bit);
|
||||
} else {
|
||||
/* CCM: write CTR0 */
|
||||
u32 iv32[AES_BLOCK_32];
|
||||
@ -1177,7 +1348,7 @@ static int stm32_cryp_read_auth_tag(struct stm32_cryp *cryp)
|
||||
|
||||
if (!cryp->caps->padding_wa)
|
||||
xiv = be32_to_cpu(biv[i]);
|
||||
stm32_cryp_write(cryp, CRYP_DIN, xiv);
|
||||
stm32_cryp_write(cryp, cryp->caps->din, xiv);
|
||||
}
|
||||
}
|
||||
|
||||
@ -1193,7 +1364,7 @@ static int stm32_cryp_read_auth_tag(struct stm32_cryp *cryp)
|
||||
|
||||
/* Get and write tag */
|
||||
for (i = 0; i < AES_BLOCK_32; i++)
|
||||
out_tag[i] = stm32_cryp_read(cryp, CRYP_DOUT);
|
||||
out_tag[i] = stm32_cryp_read(cryp, cryp->caps->dout);
|
||||
|
||||
scatterwalk_copychunks(out_tag, &cryp->out_walk, cryp->authsize, 1);
|
||||
} else {
|
||||
@ -1203,7 +1374,7 @@ static int stm32_cryp_read_auth_tag(struct stm32_cryp *cryp)
|
||||
scatterwalk_copychunks(in_tag, &cryp->in_walk, cryp->authsize, 0);
|
||||
|
||||
for (i = 0; i < AES_BLOCK_32; i++)
|
||||
out_tag[i] = stm32_cryp_read(cryp, CRYP_DOUT);
|
||||
out_tag[i] = stm32_cryp_read(cryp, cryp->caps->dout);
|
||||
|
||||
if (crypto_memneq(in_tag, out_tag, cryp->authsize))
|
||||
ret = -EBADMSG;
|
||||
@ -1211,7 +1382,7 @@ static int stm32_cryp_read_auth_tag(struct stm32_cryp *cryp)
|
||||
|
||||
/* Disable cryp */
|
||||
cfg &= ~CR_CRYPEN;
|
||||
stm32_cryp_write(cryp, CRYP_CR, cfg);
|
||||
stm32_cryp_write(cryp, cryp->caps->cr, cfg);
|
||||
|
||||
return ret;
|
||||
}
|
||||
@ -1227,19 +1398,19 @@ static void stm32_cryp_check_ctr_counter(struct stm32_cryp *cryp)
|
||||
*/
|
||||
crypto_inc((u8 *)cryp->last_ctr, sizeof(cryp->last_ctr));
|
||||
|
||||
cr = stm32_cryp_read(cryp, CRYP_CR);
|
||||
stm32_cryp_write(cryp, CRYP_CR, cr & ~CR_CRYPEN);
|
||||
cr = stm32_cryp_read(cryp, cryp->caps->cr);
|
||||
stm32_cryp_write(cryp, cryp->caps->cr, cr & ~CR_CRYPEN);
|
||||
|
||||
stm32_cryp_hw_write_iv(cryp, cryp->last_ctr);
|
||||
|
||||
stm32_cryp_write(cryp, CRYP_CR, cr);
|
||||
stm32_cryp_write(cryp, cryp->caps->cr, cr);
|
||||
}
|
||||
|
||||
/* The IV registers are BE */
|
||||
cryp->last_ctr[0] = cpu_to_be32(stm32_cryp_read(cryp, CRYP_IV0LR));
|
||||
cryp->last_ctr[1] = cpu_to_be32(stm32_cryp_read(cryp, CRYP_IV0RR));
|
||||
cryp->last_ctr[2] = cpu_to_be32(stm32_cryp_read(cryp, CRYP_IV1LR));
|
||||
cryp->last_ctr[3] = cpu_to_be32(stm32_cryp_read(cryp, CRYP_IV1RR));
|
||||
cryp->last_ctr[0] = cpu_to_be32(stm32_cryp_read(cryp, cryp->caps->iv0l));
|
||||
cryp->last_ctr[1] = cpu_to_be32(stm32_cryp_read(cryp, cryp->caps->iv0r));
|
||||
cryp->last_ctr[2] = cpu_to_be32(stm32_cryp_read(cryp, cryp->caps->iv1l));
|
||||
cryp->last_ctr[3] = cpu_to_be32(stm32_cryp_read(cryp, cryp->caps->iv1r));
|
||||
}
|
||||
|
||||
static void stm32_cryp_irq_read_data(struct stm32_cryp *cryp)
|
||||
@ -1248,7 +1419,7 @@ static void stm32_cryp_irq_read_data(struct stm32_cryp *cryp)
|
||||
u32 block[AES_BLOCK_32];
|
||||
|
||||
for (i = 0; i < cryp->hw_blocksize / sizeof(u32); i++)
|
||||
block[i] = stm32_cryp_read(cryp, CRYP_DOUT);
|
||||
block[i] = stm32_cryp_read(cryp, cryp->caps->dout);
|
||||
|
||||
scatterwalk_copychunks(block, &cryp->out_walk, min_t(size_t, cryp->hw_blocksize,
|
||||
cryp->payload_out), 1);
|
||||
@ -1264,7 +1435,7 @@ static void stm32_cryp_irq_write_block(struct stm32_cryp *cryp)
|
||||
scatterwalk_copychunks(block, &cryp->in_walk, min_t(size_t, cryp->hw_blocksize,
|
||||
cryp->payload_in), 0);
|
||||
for (i = 0; i < cryp->hw_blocksize / sizeof(u32); i++)
|
||||
stm32_cryp_write(cryp, CRYP_DIN, block[i]);
|
||||
stm32_cryp_write(cryp, cryp->caps->din, block[i]);
|
||||
|
||||
cryp->payload_in -= min_t(size_t, cryp->hw_blocksize, cryp->payload_in);
|
||||
}
|
||||
@ -1278,22 +1449,22 @@ static void stm32_cryp_irq_write_gcm_padded_data(struct stm32_cryp *cryp)
|
||||
/* 'Special workaround' procedure described in the datasheet */
|
||||
|
||||
/* a) disable ip */
|
||||
stm32_cryp_write(cryp, CRYP_IMSCR, 0);
|
||||
cfg = stm32_cryp_read(cryp, CRYP_CR);
|
||||
stm32_cryp_write(cryp, cryp->caps->imsc, 0);
|
||||
cfg = stm32_cryp_read(cryp, cryp->caps->cr);
|
||||
cfg &= ~CR_CRYPEN;
|
||||
stm32_cryp_write(cryp, CRYP_CR, cfg);
|
||||
stm32_cryp_write(cryp, cryp->caps->cr, cfg);
|
||||
|
||||
/* b) Update IV1R */
|
||||
stm32_cryp_write(cryp, CRYP_IV1RR, cryp->gcm_ctr - 2);
|
||||
stm32_cryp_write(cryp, cryp->caps->iv1r, cryp->gcm_ctr - 2);
|
||||
|
||||
/* c) change mode to CTR */
|
||||
cfg &= ~CR_ALGO_MASK;
|
||||
cfg |= CR_AES_CTR;
|
||||
stm32_cryp_write(cryp, CRYP_CR, cfg);
|
||||
stm32_cryp_write(cryp, cryp->caps->cr, cfg);
|
||||
|
||||
/* a) enable IP */
|
||||
cfg |= CR_CRYPEN;
|
||||
stm32_cryp_write(cryp, CRYP_CR, cfg);
|
||||
stm32_cryp_write(cryp, cryp->caps->cr, cfg);
|
||||
|
||||
/* b) pad and write the last block */
|
||||
stm32_cryp_irq_write_block(cryp);
|
||||
@ -1310,7 +1481,7 @@ static void stm32_cryp_irq_write_gcm_padded_data(struct stm32_cryp *cryp)
|
||||
* block value
|
||||
*/
|
||||
for (i = 0; i < cryp->hw_blocksize / sizeof(u32); i++)
|
||||
block[i] = stm32_cryp_read(cryp, CRYP_DOUT);
|
||||
block[i] = stm32_cryp_read(cryp, cryp->caps->dout);
|
||||
|
||||
scatterwalk_copychunks(block, &cryp->out_walk, min_t(size_t, cryp->hw_blocksize,
|
||||
cryp->payload_out), 1);
|
||||
@ -1320,16 +1491,16 @@ static void stm32_cryp_irq_write_gcm_padded_data(struct stm32_cryp *cryp)
|
||||
/* d) change mode back to AES GCM */
|
||||
cfg &= ~CR_ALGO_MASK;
|
||||
cfg |= CR_AES_GCM;
|
||||
stm32_cryp_write(cryp, CRYP_CR, cfg);
|
||||
stm32_cryp_write(cryp, cryp->caps->cr, cfg);
|
||||
|
||||
/* e) change phase to Final */
|
||||
cfg &= ~CR_PH_MASK;
|
||||
cfg |= CR_PH_FINAL;
|
||||
stm32_cryp_write(cryp, CRYP_CR, cfg);
|
||||
stm32_cryp_write(cryp, cryp->caps->cr, cfg);
|
||||
|
||||
/* f) write padded data */
|
||||
for (i = 0; i < AES_BLOCK_32; i++)
|
||||
stm32_cryp_write(cryp, CRYP_DIN, block[i]);
|
||||
stm32_cryp_write(cryp, cryp->caps->din, block[i]);
|
||||
|
||||
/* g) Empty fifo out */
|
||||
err = stm32_cryp_wait_output(cryp);
|
||||
@ -1339,7 +1510,7 @@ static void stm32_cryp_irq_write_gcm_padded_data(struct stm32_cryp *cryp)
|
||||
}
|
||||
|
||||
for (i = 0; i < AES_BLOCK_32; i++)
|
||||
stm32_cryp_read(cryp, CRYP_DOUT);
|
||||
stm32_cryp_read(cryp, cryp->caps->dout);
|
||||
|
||||
/* h) run the he normal Final phase */
|
||||
stm32_cryp_finish_req(cryp, 0);
|
||||
@ -1350,13 +1521,13 @@ static void stm32_cryp_irq_set_npblb(struct stm32_cryp *cryp)
|
||||
u32 cfg;
|
||||
|
||||
/* disable ip, set NPBLB and reneable ip */
|
||||
cfg = stm32_cryp_read(cryp, CRYP_CR);
|
||||
cfg = stm32_cryp_read(cryp, cryp->caps->cr);
|
||||
cfg &= ~CR_CRYPEN;
|
||||
stm32_cryp_write(cryp, CRYP_CR, cfg);
|
||||
stm32_cryp_write(cryp, cryp->caps->cr, cfg);
|
||||
|
||||
cfg |= (cryp->hw_blocksize - cryp->payload_in) << CR_NBPBL_SHIFT;
|
||||
cfg |= CR_CRYPEN;
|
||||
stm32_cryp_write(cryp, CRYP_CR, cfg);
|
||||
stm32_cryp_write(cryp, cryp->caps->cr, cfg);
|
||||
}
|
||||
|
||||
static void stm32_cryp_irq_write_ccm_padded_data(struct stm32_cryp *cryp)
|
||||
@ -1370,11 +1541,11 @@ static void stm32_cryp_irq_write_ccm_padded_data(struct stm32_cryp *cryp)
|
||||
/* 'Special workaround' procedure described in the datasheet */
|
||||
|
||||
/* a) disable ip */
|
||||
stm32_cryp_write(cryp, CRYP_IMSCR, 0);
|
||||
stm32_cryp_write(cryp, cryp->caps->imsc, 0);
|
||||
|
||||
cfg = stm32_cryp_read(cryp, CRYP_CR);
|
||||
cfg = stm32_cryp_read(cryp, cryp->caps->cr);
|
||||
cfg &= ~CR_CRYPEN;
|
||||
stm32_cryp_write(cryp, CRYP_CR, cfg);
|
||||
stm32_cryp_write(cryp, cryp->caps->cr, cfg);
|
||||
|
||||
/* b) get IV1 from CRYP_CSGCMCCM7 */
|
||||
iv1tmp = stm32_cryp_read(cryp, CRYP_CSGCMCCM0R + 7 * 4);
|
||||
@ -1384,16 +1555,16 @@ static void stm32_cryp_irq_write_ccm_padded_data(struct stm32_cryp *cryp)
|
||||
cstmp1[i] = stm32_cryp_read(cryp, CRYP_CSGCMCCM0R + i * 4);
|
||||
|
||||
/* d) Write IV1R */
|
||||
stm32_cryp_write(cryp, CRYP_IV1RR, iv1tmp);
|
||||
stm32_cryp_write(cryp, cryp->caps->iv1r, iv1tmp);
|
||||
|
||||
/* e) change mode to CTR */
|
||||
cfg &= ~CR_ALGO_MASK;
|
||||
cfg |= CR_AES_CTR;
|
||||
stm32_cryp_write(cryp, CRYP_CR, cfg);
|
||||
stm32_cryp_write(cryp, cryp->caps->cr, cfg);
|
||||
|
||||
/* a) enable IP */
|
||||
cfg |= CR_CRYPEN;
|
||||
stm32_cryp_write(cryp, CRYP_CR, cfg);
|
||||
stm32_cryp_write(cryp, cryp->caps->cr, cfg);
|
||||
|
||||
/* b) pad and write the last block */
|
||||
stm32_cryp_irq_write_block(cryp);
|
||||
@ -1410,7 +1581,7 @@ static void stm32_cryp_irq_write_ccm_padded_data(struct stm32_cryp *cryp)
|
||||
* block value
|
||||
*/
|
||||
for (i = 0; i < cryp->hw_blocksize / sizeof(u32); i++)
|
||||
block[i] = stm32_cryp_read(cryp, CRYP_DOUT);
|
||||
block[i] = stm32_cryp_read(cryp, cryp->caps->dout);
|
||||
|
||||
scatterwalk_copychunks(block, &cryp->out_walk, min_t(size_t, cryp->hw_blocksize,
|
||||
cryp->payload_out), 1);
|
||||
@ -1423,18 +1594,18 @@ static void stm32_cryp_irq_write_ccm_padded_data(struct stm32_cryp *cryp)
|
||||
/* e) change mode back to AES CCM */
|
||||
cfg &= ~CR_ALGO_MASK;
|
||||
cfg |= CR_AES_CCM;
|
||||
stm32_cryp_write(cryp, CRYP_CR, cfg);
|
||||
stm32_cryp_write(cryp, cryp->caps->cr, cfg);
|
||||
|
||||
/* f) change phase to header */
|
||||
cfg &= ~CR_PH_MASK;
|
||||
cfg |= CR_PH_HEADER;
|
||||
stm32_cryp_write(cryp, CRYP_CR, cfg);
|
||||
stm32_cryp_write(cryp, cryp->caps->cr, cfg);
|
||||
|
||||
/* g) XOR and write padded data */
|
||||
for (i = 0; i < ARRAY_SIZE(block); i++) {
|
||||
block[i] ^= cstmp1[i];
|
||||
block[i] ^= cstmp2[i];
|
||||
stm32_cryp_write(cryp, CRYP_DIN, block[i]);
|
||||
stm32_cryp_write(cryp, cryp->caps->din, block[i]);
|
||||
}
|
||||
|
||||
/* h) wait for completion */
|
||||
@ -1497,7 +1668,7 @@ static void stm32_cryp_irq_write_gcmccm_header(struct stm32_cryp *cryp)
|
||||
|
||||
scatterwalk_copychunks(block, &cryp->in_walk, written, 0);
|
||||
for (i = 0; i < AES_BLOCK_32; i++)
|
||||
stm32_cryp_write(cryp, CRYP_DIN, block[i]);
|
||||
stm32_cryp_write(cryp, cryp->caps->din, block[i]);
|
||||
|
||||
cryp->header_in -= written;
|
||||
|
||||
@ -1508,7 +1679,7 @@ static irqreturn_t stm32_cryp_irq_thread(int irq, void *arg)
|
||||
{
|
||||
struct stm32_cryp *cryp = arg;
|
||||
u32 ph;
|
||||
u32 it_mask = stm32_cryp_read(cryp, CRYP_IMSCR);
|
||||
u32 it_mask = stm32_cryp_read(cryp, cryp->caps->imsc);
|
||||
|
||||
if (cryp->irq_status & MISR_OUT)
|
||||
/* Output FIFO IRQ: read data */
|
||||
@ -1516,7 +1687,7 @@ static irqreturn_t stm32_cryp_irq_thread(int irq, void *arg)
|
||||
|
||||
if (cryp->irq_status & MISR_IN) {
|
||||
if (is_gcm(cryp) || is_ccm(cryp)) {
|
||||
ph = stm32_cryp_read(cryp, CRYP_CR) & CR_PH_MASK;
|
||||
ph = stm32_cryp_read(cryp, cryp->caps->cr) & CR_PH_MASK;
|
||||
if (unlikely(ph == CR_PH_HEADER))
|
||||
/* Write Header */
|
||||
stm32_cryp_irq_write_gcmccm_header(cryp);
|
||||
@ -1536,7 +1707,7 @@ static irqreturn_t stm32_cryp_irq_thread(int irq, void *arg)
|
||||
it_mask &= ~IMSCR_IN;
|
||||
if (!cryp->payload_out)
|
||||
it_mask &= ~IMSCR_OUT;
|
||||
stm32_cryp_write(cryp, CRYP_IMSCR, it_mask);
|
||||
stm32_cryp_write(cryp, cryp->caps->imsc, it_mask);
|
||||
|
||||
if (!cryp->payload_in && !cryp->header_in && !cryp->payload_out)
|
||||
stm32_cryp_finish_req(cryp, 0);
|
||||
@ -1548,7 +1719,7 @@ static irqreturn_t stm32_cryp_irq(int irq, void *arg)
|
||||
{
|
||||
struct stm32_cryp *cryp = arg;
|
||||
|
||||
cryp->irq_status = stm32_cryp_read(cryp, CRYP_MISR);
|
||||
cryp->irq_status = stm32_cryp_read(cryp, cryp->caps->mis);
|
||||
|
||||
return IRQ_WAKE_THREAD;
|
||||
}
|
||||
@ -1722,17 +1893,74 @@ static struct aead_alg aead_algs[] = {
|
||||
},
|
||||
};
|
||||
|
||||
static const struct stm32_cryp_caps f7_data = {
|
||||
static const struct stm32_cryp_caps ux500_data = {
|
||||
.aeads_support = false,
|
||||
.linear_aes_key = true,
|
||||
.kp_mode = false,
|
||||
.iv_protection = true,
|
||||
.swap_final = true,
|
||||
.padding_wa = true,
|
||||
.cr = UX500_CRYP_CR,
|
||||
.sr = UX500_CRYP_SR,
|
||||
.din = UX500_CRYP_DIN,
|
||||
.dout = UX500_CRYP_DOUT,
|
||||
.imsc = UX500_CRYP_IMSC,
|
||||
.mis = UX500_CRYP_MIS,
|
||||
.k1l = UX500_CRYP_K1L,
|
||||
.k1r = UX500_CRYP_K1R,
|
||||
.k3r = UX500_CRYP_K3R,
|
||||
.iv0l = UX500_CRYP_IV0L,
|
||||
.iv0r = UX500_CRYP_IV0R,
|
||||
.iv1l = UX500_CRYP_IV1L,
|
||||
.iv1r = UX500_CRYP_IV1R,
|
||||
};
|
||||
|
||||
static const struct stm32_cryp_caps f7_data = {
|
||||
.aeads_support = true,
|
||||
.linear_aes_key = false,
|
||||
.kp_mode = true,
|
||||
.iv_protection = false,
|
||||
.swap_final = true,
|
||||
.padding_wa = true,
|
||||
.cr = CRYP_CR,
|
||||
.sr = CRYP_SR,
|
||||
.din = CRYP_DIN,
|
||||
.dout = CRYP_DOUT,
|
||||
.imsc = CRYP_IMSCR,
|
||||
.mis = CRYP_MISR,
|
||||
.k1l = CRYP_K1LR,
|
||||
.k1r = CRYP_K1RR,
|
||||
.k3r = CRYP_K3RR,
|
||||
.iv0l = CRYP_IV0LR,
|
||||
.iv0r = CRYP_IV0RR,
|
||||
.iv1l = CRYP_IV1LR,
|
||||
.iv1r = CRYP_IV1RR,
|
||||
};
|
||||
|
||||
static const struct stm32_cryp_caps mp1_data = {
|
||||
.aeads_support = true,
|
||||
.linear_aes_key = false,
|
||||
.kp_mode = true,
|
||||
.iv_protection = false,
|
||||
.swap_final = false,
|
||||
.padding_wa = false,
|
||||
.cr = CRYP_CR,
|
||||
.sr = CRYP_SR,
|
||||
.din = CRYP_DIN,
|
||||
.dout = CRYP_DOUT,
|
||||
.imsc = CRYP_IMSCR,
|
||||
.mis = CRYP_MISR,
|
||||
.k1l = CRYP_K1LR,
|
||||
.k1r = CRYP_K1RR,
|
||||
.k3r = CRYP_K3RR,
|
||||
.iv0l = CRYP_IV0LR,
|
||||
.iv0r = CRYP_IV0RR,
|
||||
.iv1l = CRYP_IV1LR,
|
||||
.iv1r = CRYP_IV1RR,
|
||||
};
|
||||
|
||||
static const struct of_device_id stm32_dt_ids[] = {
|
||||
{ .compatible = "stericsson,ux500-cryp", .data = &ux500_data},
|
||||
{ .compatible = "st,stm32f756-cryp", .data = &f7_data},
|
||||
{ .compatible = "st,stm32mp1-cryp", .data = &mp1_data},
|
||||
{},
|
||||
@ -1829,9 +2057,11 @@ static int stm32_cryp_probe(struct platform_device *pdev)
|
||||
goto err_algs;
|
||||
}
|
||||
|
||||
ret = crypto_register_aeads(aead_algs, ARRAY_SIZE(aead_algs));
|
||||
if (ret)
|
||||
goto err_aead_algs;
|
||||
if (cryp->caps->aeads_support) {
|
||||
ret = crypto_register_aeads(aead_algs, ARRAY_SIZE(aead_algs));
|
||||
if (ret)
|
||||
goto err_aead_algs;
|
||||
}
|
||||
|
||||
dev_info(dev, "Initialized\n");
|
||||
|
||||
@ -1869,7 +2099,8 @@ static int stm32_cryp_remove(struct platform_device *pdev)
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
crypto_unregister_aeads(aead_algs, ARRAY_SIZE(aead_algs));
|
||||
if (cryp->caps->aeads_support)
|
||||
crypto_unregister_aeads(aead_algs, ARRAY_SIZE(aead_algs));
|
||||
crypto_unregister_skciphers(crypto_algs, ARRAY_SIZE(crypto_algs));
|
||||
|
||||
crypto_engine_exit(cryp->engine);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user