diff options
Diffstat (limited to 'drivers/crypto/stm32/stm32_crc32.c')
| -rw-r--r-- | drivers/crypto/stm32/stm32_crc32.c | 72 |
1 files changed, 66 insertions, 6 deletions
diff --git a/drivers/crypto/stm32/stm32_crc32.c b/drivers/crypto/stm32/stm32_crc32.c index 8f09b8430893..29d2095d9dfd 100644 --- a/drivers/crypto/stm32/stm32_crc32.c +++ b/drivers/crypto/stm32/stm32_crc32.c @@ -6,8 +6,11 @@ #include <linux/bitrev.h> #include <linux/clk.h> +#include <linux/crc32poly.h> #include <linux/module.h> +#include <linux/mod_devicetable.h> #include <linux/platform_device.h> +#include <linux/pm_runtime.h> #include <crypto/internal/hash.h> @@ -28,9 +31,7 @@ #define CRC_CR_REVERSE (BIT(7) | BIT(6) | BIT(5)) #define CRC_INIT_DEFAULT 0xFFFFFFFF -/* Polynomial reversed */ -#define POLY_CRC32 0xEDB88320 -#define POLY_CRC32C 0x82F63B78 +#define CRC_AUTOSUSPEND_DELAY 50 struct stm32_crc { struct list_head list; @@ -66,7 +67,7 @@ static int stm32_crc32_cra_init(struct crypto_tfm *tfm) struct stm32_crc_ctx *mctx = crypto_tfm_ctx(tfm); mctx->key = CRC_INIT_DEFAULT; - mctx->poly = POLY_CRC32; + mctx->poly = CRC32_POLY_LE; return 0; } @@ -75,7 +76,7 @@ static int stm32_crc32c_cra_init(struct crypto_tfm *tfm) struct stm32_crc_ctx *mctx = crypto_tfm_ctx(tfm); mctx->key = CRC_INIT_DEFAULT; - mctx->poly = POLY_CRC32C; + mctx->poly = CRC32C_POLY_LE; return 0; } @@ -106,6 +107,8 @@ static int stm32_crc_init(struct shash_desc *desc) } spin_unlock_bh(&crc_list.lock); + pm_runtime_get_sync(ctx->crc->dev); + /* Reset, set key, poly and configure in bit reverse mode */ writel_relaxed(bitrev32(mctx->key), ctx->crc->regs + CRC_INIT); writel_relaxed(bitrev32(mctx->poly), ctx->crc->regs + CRC_POL); @@ -115,6 +118,9 @@ static int stm32_crc_init(struct shash_desc *desc) ctx->partial = readl_relaxed(ctx->crc->regs + CRC_DR); ctx->crc->nb_pending_bytes = 0; + pm_runtime_mark_last_busy(ctx->crc->dev); + pm_runtime_put_autosuspend(ctx->crc->dev); + return 0; } @@ -126,6 +132,8 @@ static int stm32_crc_update(struct shash_desc *desc, const u8 *d8, u32 *d32; unsigned int i; + pm_runtime_get_sync(crc->dev); + if (unlikely(crc->nb_pending_bytes)) { while (crc->nb_pending_bytes != sizeof(u32) && length) { /* Fill in pending data */ @@ -149,6 +157,9 @@ static int stm32_crc_update(struct shash_desc *desc, const u8 *d8, /* Store partial result */ ctx->partial = readl_relaxed(crc->regs + CRC_DR); + pm_runtime_mark_last_busy(crc->dev); + pm_runtime_put_autosuspend(crc->dev); + /* Check for pending data (non 32 bits) */ length &= 3; if (likely(!length)) @@ -174,7 +185,7 @@ static int stm32_crc_final(struct shash_desc *desc, u8 *out) struct stm32_crc_ctx *mctx = crypto_shash_ctx(desc->tfm); /* Send computed CRC */ - put_unaligned_le32(mctx->poly == POLY_CRC32C ? + put_unaligned_le32(mctx->poly == CRC32C_POLY_LE ? ~ctx->partial : ctx->partial, out); return 0; @@ -272,6 +283,13 @@ static int stm32_crc_probe(struct platform_device *pdev) return ret; } + pm_runtime_set_autosuspend_delay(dev, CRC_AUTOSUSPEND_DELAY); + pm_runtime_use_autosuspend(dev); + + pm_runtime_get_noresume(dev); + pm_runtime_set_active(dev); + pm_runtime_enable(dev); + platform_set_drvdata(pdev, crc); spin_lock(&crc_list.lock); @@ -287,12 +305,18 @@ static int stm32_crc_probe(struct platform_device *pdev) dev_info(dev, "Initialized\n"); + pm_runtime_put_sync(dev); + return 0; } static int stm32_crc_remove(struct platform_device *pdev) { struct stm32_crc *crc = platform_get_drvdata(pdev); + int ret = pm_runtime_get_sync(crc->dev); + + if (ret < 0) + return ret; spin_lock(&crc_list.lock); list_del(&crc->list); @@ -300,11 +324,46 @@ static int stm32_crc_remove(struct platform_device *pdev) crypto_unregister_shashes(algs, ARRAY_SIZE(algs)); + pm_runtime_disable(crc->dev); + pm_runtime_put_noidle(crc->dev); + + clk_disable_unprepare(crc->clk); + + return 0; +} + +#ifdef CONFIG_PM +static int stm32_crc_runtime_suspend(struct device *dev) +{ + struct stm32_crc *crc = dev_get_drvdata(dev); + clk_disable_unprepare(crc->clk); return 0; } +static int stm32_crc_runtime_resume(struct device *dev) +{ + struct stm32_crc *crc = dev_get_drvdata(dev); + int ret; + + ret = clk_prepare_enable(crc->clk); + if (ret) { + dev_err(crc->dev, "Failed to prepare_enable clock\n"); + return ret; + } + + return 0; +} +#endif + +static const struct dev_pm_ops stm32_crc_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, + pm_runtime_force_resume) + SET_RUNTIME_PM_OPS(stm32_crc_runtime_suspend, + stm32_crc_runtime_resume, NULL) +}; + static const struct of_device_id stm32_dt_ids[] = { { .compatible = "st,stm32f7-crc", }, {}, @@ -316,6 +375,7 @@ static struct platform_driver stm32_crc_driver = { .remove = stm32_crc_remove, .driver = { .name = DRIVER_NAME, + .pm = &stm32_crc_pm_ops, .of_match_table = stm32_dt_ids, }, }; |