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Miller" , Maxime Coquelin , "Alexandre Torgue" , , , CC: Benjamin Gaignard , Fabien Dessenne , Ludovic Barre Subject: [PATCH 2/3] crypto: stm32/hash - Add power management support Date: Tue, 26 Jun 2018 14:52:45 +0200 Message-ID: <1530017566-14779-3-git-send-email-lionel.debieve@st.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1530017566-14779-1-git-send-email-lionel.debieve@st.com> References: <1530017566-14779-1-git-send-email-lionel.debieve@st.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.201.23.65] X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-06-26_07:,, signatures=0 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Adding pm and pm_runtime support to STM32 HASH. Signed-off-by: Lionel Debieve --- drivers/crypto/stm32/stm32-hash.c | 71 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 71 insertions(+) diff --git a/drivers/crypto/stm32/stm32-hash.c b/drivers/crypto/stm32/stm32-hash.c index cdc96f1..d1d7233 100644 --- a/drivers/crypto/stm32/stm32-hash.c +++ b/drivers/crypto/stm32/stm32-hash.c @@ -31,6 +31,7 @@ #include #include #include +#include #include #include @@ -121,6 +122,8 @@ enum stm32_hash_data_format { #define HASH_QUEUE_LENGTH 16 #define HASH_DMA_THRESHOLD 50 +#define HASH_AUTOSUSPEND_DELAY 50 + struct stm32_hash_ctx { struct crypto_engine_ctx enginectx; struct stm32_hash_dev *hdev; @@ -814,12 +817,17 @@ static void stm32_hash_finish_req(struct ahash_request *req, int err) rctx->flags |= HASH_FLAGS_ERRORS; } + pm_runtime_mark_last_busy(hdev->dev); + pm_runtime_put_autosuspend(hdev->dev); + crypto_finalize_hash_request(hdev->engine, req, err); } static int stm32_hash_hw_init(struct stm32_hash_dev *hdev, struct stm32_hash_request_ctx *rctx) { + pm_runtime_get_sync(hdev->dev); + if (!(HASH_FLAGS_INIT & hdev->flags)) { stm32_hash_write(hdev, HASH_CR, HASH_CR_INIT); stm32_hash_write(hdev, HASH_STR, 0); @@ -967,6 +975,8 @@ static int stm32_hash_export(struct ahash_request *req, void *out) u32 *preg; unsigned int i; + pm_runtime_get_sync(hdev->dev); + while (!(stm32_hash_read(hdev, HASH_SR) & HASH_SR_DATA_INPUT_READY)) cpu_relax(); @@ -982,6 +992,9 @@ static int stm32_hash_export(struct ahash_request *req, void *out) for (i = 0; i < HASH_CSR_REGISTER_NUMBER; i++) *preg++ = stm32_hash_read(hdev, HASH_CSR(i)); + pm_runtime_mark_last_busy(hdev->dev); + pm_runtime_put_autosuspend(hdev->dev); + memcpy(out, rctx, sizeof(*rctx)); return 0; @@ -1000,6 +1013,8 @@ static int stm32_hash_import(struct ahash_request *req, const void *in) preg = rctx->hw_context; + pm_runtime_get_sync(hdev->dev); + stm32_hash_write(hdev, HASH_IMR, *preg++); stm32_hash_write(hdev, HASH_STR, *preg++); stm32_hash_write(hdev, HASH_CR, *preg); @@ -1009,6 +1024,9 @@ static int stm32_hash_import(struct ahash_request *req, const void *in) for (i = 0; i < HASH_CSR_REGISTER_NUMBER; i++) stm32_hash_write(hdev, HASH_CSR(i), *preg++); + pm_runtime_mark_last_busy(hdev->dev); + pm_runtime_put_autosuspend(hdev->dev); + kfree(rctx->hw_context); return 0; @@ -1482,6 +1500,13 @@ static int stm32_hash_probe(struct platform_device *pdev) return ret; } + pm_runtime_set_autosuspend_delay(dev, HASH_AUTOSUSPEND_DELAY); + pm_runtime_use_autosuspend(dev); + + pm_runtime_get_noresume(dev); + pm_runtime_set_active(dev); + pm_runtime_enable(dev); + hdev->rst = devm_reset_control_get(&pdev->dev, NULL); if (!IS_ERR(hdev->rst)) { reset_control_assert(hdev->rst); @@ -1522,6 +1547,8 @@ static int stm32_hash_probe(struct platform_device *pdev) dev_info(dev, "Init HASH done HW ver %x DMA mode %u\n", stm32_hash_read(hdev, HASH_VER), hdev->dma_mode); + pm_runtime_put_sync(dev); + return 0; err_algs: @@ -1535,6 +1562,9 @@ static int stm32_hash_probe(struct platform_device *pdev) if (hdev->dma_lch) dma_release_channel(hdev->dma_lch); + pm_runtime_disable(dev); + pm_runtime_put_noidle(dev); + clk_disable_unprepare(hdev->clk); return ret; @@ -1543,11 +1573,16 @@ static int stm32_hash_probe(struct platform_device *pdev) static int stm32_hash_remove(struct platform_device *pdev) { static struct stm32_hash_dev *hdev; + int ret; hdev = platform_get_drvdata(pdev); if (!hdev) return -ENODEV; + ret = pm_runtime_get_sync(hdev->dev); + if (ret < 0) + return ret; + stm32_hash_unregister_algs(hdev); crypto_engine_exit(hdev->engine); @@ -1559,16 +1594,52 @@ static int stm32_hash_remove(struct platform_device *pdev) if (hdev->dma_lch) dma_release_channel(hdev->dma_lch); + pm_runtime_disable(hdev->dev); + pm_runtime_put_noidle(hdev->dev); + clk_disable_unprepare(hdev->clk); return 0; } +#ifdef CONFIG_PM +static int stm32_hash_runtime_suspend(struct device *dev) +{ + struct stm32_hash_dev *hdev = dev_get_drvdata(dev); + + clk_disable_unprepare(hdev->clk); + + return 0; +} + +static int stm32_hash_runtime_resume(struct device *dev) +{ + struct stm32_hash_dev *hdev = dev_get_drvdata(dev); + int ret; + + ret = clk_prepare_enable(hdev->clk); + if (ret) { + dev_err(hdev->dev, "Failed to prepare_enable clock\n"); + return ret; + } + + return 0; +} +#endif + +static const struct dev_pm_ops stm32_hash_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, + pm_runtime_force_resume) + SET_RUNTIME_PM_OPS(stm32_hash_runtime_suspend, + stm32_hash_runtime_resume, NULL) +}; + static struct platform_driver stm32_hash_driver = { .probe = stm32_hash_probe, .remove = stm32_hash_remove, .driver = { .name = "stm32-hash", + .pm = &stm32_hash_pm_ops, .of_match_table = stm32_hash_of_match, } }; -- 2.7.4