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SubjectRe: [RESEND,PATCH v4 3/3] crypto : stm32 - Add STM32F4 CRC32 support
Date
Hi Cosar,

- 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);

Should it be better to have a dedicated array per platform data instead? Could be new platform update?

BR,

Lionel


On 07/17/2017 10:27 AM, Cosar Dindar wrote:
> 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 <cosardindar@gmail.com>
> Reviewed-by: Fabien Dessenne <fabien.dessenne@st.com>
> ---
> 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 <linux/bitrev.h>
> #include <linux/clk.h>
> #include <linux/module.h>
> +#include <linux/of.h>
> #include <linux/platform_device.h>
>
> #include <crypto/internal/hash.h>
> @@ -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);

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