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Subject[PATCH 3/3] crypto: stm32/crc - Add power management support
Date
Adding pm and pm_runtime support to STM32 CRC.

Signed-off-by: Lionel Debieve <lionel.debieve@st.com>
---
drivers/crypto/stm32/stm32_crc32.c | 62 ++++++++++++++++++++++++++++++++++++++
1 file changed, 62 insertions(+)

diff --git a/drivers/crypto/stm32/stm32_crc32.c b/drivers/crypto/stm32/stm32_crc32.c
index 8f09b84..04ba5e1 100644
--- a/drivers/crypto/stm32/stm32_crc32.c
+++ b/drivers/crypto/stm32/stm32_crc32.c
@@ -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,
},
};
--
2.7.4
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