Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752408AbdFUXPf (ORCPT ); Wed, 21 Jun 2017 19:15:35 -0400 Received: from mail-wr0-f194.google.com ([209.85.128.194]:33221 "EHLO mail-wr0-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752139AbdFUXPe (ORCPT ); Wed, 21 Jun 2017 19:15:34 -0400 From: Cosar Dindar To: herbert@gondor.apana.org.au Cc: davem@davemloft.net, mcoquelin.stm32@gmail.com, alexandre.torgue@st.com, linux-crypto@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Cosar Dindar Subject: [RESEND,PATCH v4 2/5] crypto : stm32 - Add STM32F4 CRC32 support Date: Thu, 22 Jun 2017 02:14:59 +0300 Message-Id: <1498086899-104804-1-git-send-email-cosardindar@gmail.com> X-Mailer: git-send-email 2.7.4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4914 Lines: 155 This patch adds CRC (CRC32 Crypto) support for STM32F4 series. As an hardware limitation polynomial and key setting are not supported. They are fixed as 0x4C11DB7 (poly) and 0xFFFFFFFF (key). CRC32C Castagnoli algorithm is not used. Signed-off-by: Cosar Dindar Reviewed-by: Fabien Dessenne --- Changes in v4: - Add Fabien Dessenne's Reviewed-by tag. drivers/crypto/stm32/stm32_crc32.c | 68 ++++++++++++++++++++++++++++++++------ 1 file changed, 58 insertions(+), 10 deletions(-) diff --git a/drivers/crypto/stm32/stm32_crc32.c b/drivers/crypto/stm32/stm32_crc32.c index ec83b1e..12fbd98 100644 --- a/drivers/crypto/stm32/stm32_crc32.c +++ b/drivers/crypto/stm32/stm32_crc32.c @@ -7,6 +7,7 @@ #include #include #include +#include #include #include @@ -39,6 +40,9 @@ struct stm32_crc { struct clk *clk; u8 pending_data[sizeof(u32)]; size_t nb_pending_bytes; + bool key_support; + bool poly_support; + bool reverse_support; }; struct stm32_crc_list { @@ -106,13 +110,31 @@ static int stm32_crc_init(struct shash_desc *desc) } spin_unlock_bh(&crc_list.lock); - /* Reset, set key, poly and configure in bit reverse mode */ - writel(bitrev32(mctx->key), ctx->crc->regs + CRC_INIT); - writel(bitrev32(mctx->poly), ctx->crc->regs + CRC_POL); - writel(CRC_CR_RESET | CRC_CR_REVERSE, ctx->crc->regs + CRC_CR); + /* set key */ + if (ctx->crc->key_support) { + writel(bitrev32(mctx->key), ctx->crc->regs + CRC_INIT); + } else if (mctx->key != CRC_INIT_DEFAULT) { + dev_err(ctx->crc->dev, "Unsupported key value! Should be: 0x%x\n", + CRC_INIT_DEFAULT); + return -EINVAL; + } + + /* set poly */ + if (ctx->crc->poly_support) + writel(bitrev32(mctx->poly), ctx->crc->regs + CRC_POL); + + /* reset and configure in bit reverse mode if supported */ + if (ctx->crc->reverse_support) + writel(CRC_CR_RESET | CRC_CR_REVERSE, ctx->crc->regs + CRC_CR); + else + writel(CRC_CR_RESET, ctx->crc->regs + CRC_CR); + + /* store partial result */ + if (!ctx->crc->reverse_support) + ctx->partial = bitrev32(readl(crc->regs + CRC_DR)); + else + ctx->partial = readl(ctx->crc->regs + CRC_DR); - /* Store partial result */ - ctx->partial = readl(ctx->crc->regs + CRC_DR); ctx->crc->nb_pending_bytes = 0; return 0; @@ -135,7 +157,12 @@ static int stm32_crc_update(struct shash_desc *desc, const u8 *d8, if (crc->nb_pending_bytes == sizeof(u32)) { /* Process completed pending data */ - writel(*(u32 *)crc->pending_data, crc->regs + CRC_DR); + if (!ctx->crc->reverse_support) + writel(bitrev32(*(u32 *)crc->pending_data), + crc->regs + CRC_DR); + else + writel(*(u32 *)crc->pending_data, + crc->regs + CRC_DR); crc->nb_pending_bytes = 0; } } @@ -143,10 +170,16 @@ static int stm32_crc_update(struct shash_desc *desc, const u8 *d8, d32 = (u32 *)d8; for (i = 0; i < length >> 2; i++) /* Process 32 bits data */ - writel(*(d32++), crc->regs + CRC_DR); + if (!ctx->crc->reverse_support) + writel(bitrev32(*(d32++)), crc->regs + CRC_DR); + else + writel(*(d32++), crc->regs + CRC_DR); /* Store partial result */ - ctx->partial = readl(crc->regs + CRC_DR); + if (!ctx->crc->reverse_support) + ctx->partial = bitrev32(readl(crc->regs + CRC_DR)); + else + ctx->partial = readl(crc->regs + CRC_DR); /* Check for pending data (non 32 bits) */ length &= 3; @@ -243,6 +276,7 @@ static int stm32_crc_probe(struct platform_device *pdev) struct stm32_crc *crc; struct resource *res; int ret; + int algs_size; crc = devm_kzalloc(dev, sizeof(*crc), GFP_KERNEL); if (!crc) @@ -269,13 +303,26 @@ static int stm32_crc_probe(struct platform_device *pdev) return ret; } + /* set key, poly and reverse support if device is of F7 series */ + if (of_device_is_compatible(crc->dev->of_node, "st,stm32f7-crc")) { + crc->key_support = true; + crc->poly_support = true; + crc->reverse_support = true; + } + platform_set_drvdata(pdev, crc); spin_lock(&crc_list.lock); list_add(&crc->list, &crc_list.dev_list); spin_unlock(&crc_list.lock); - ret = crypto_register_shashes(algs, ARRAY_SIZE(algs)); + /* For F4 series only CRC32 algorithm will be used */ + if (of_device_is_compatible(crc->dev->of_node, "st,stm32f4-crc")) + algs_size = 1; + else + algs_size = ARRAY_SIZE(algs); + + ret = crypto_register_shashes(algs, algs_size); if (ret) { dev_err(dev, "Failed to register\n"); clk_disable_unprepare(crc->clk); @@ -304,6 +351,7 @@ static int stm32_crc_remove(struct platform_device *pdev) static const struct of_device_id stm32_dt_ids[] = { { .compatible = "st,stm32f7-crc", }, + { .compatible = "st,stm32f4-crc", }, {}, }; MODULE_DEVICE_TABLE(of, stm32_dt_ids); -- 2.7.4