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Commit 73463ade authored by lionel.debieve@st.com's avatar lionel.debieve@st.com Committed by Herbert Xu
Browse files

crypto: stm32/crc - Add power management support 



Adding pm and pm_runtime support to STM32 CRC.

Signed-off-by: default avatarLionel Debieve <lionel.debieve@st.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 8b4d566d

drivers/crypto/stm32/stm32_crc32.c

+62 −0
Original line number Diff line number Diff line
@@ -8,6 +8,7 @@ 
#include <linux/clk.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/pm_runtime.h>



#include <crypto/internal/hash.h>
@@ -32,6 +33,8 @@ 
#define POLY_CRC32              0xEDB88320

#define POLY_CRC32C             0x82F63B78



#define CRC_AUTOSUSPEND_DELAY	50



struct stm32_crc {

	struct list_head list;

	struct device    *dev;
@@ -106,6 +109,8 @@ 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 +120,9 @@ 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 +134,8 @@ 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 +159,9 @@ 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))
@@ -272,6 +285,13 @@ 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 +307,18 @@ 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 +326,46 @@ 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 +377,7 @@ 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,

	},

};