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crypto: stm32/hash - Add power management support

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Adding pm and pm_runtime support to STM32 HASH.

Signed-off-by: Lionel Debieve <lionel.debieve@st.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
lionel.debieve@st.com 2018-06-26 14:52:45 +02:00 committed by Herbert Xu
parent 65f9aa36ee
commit 8b4d566de6
1 changed files with 71 additions and 0 deletions
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71
drivers/crypto/stm32/stm32-hash.c
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@ -31,6 +31,7 @@
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/reset.h>
#include <crypto/engine.h>
@ -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,
}
};