1 files changed, 82 insertions, 0 deletions
diff --git a/drivers/crypto/ccree/cc_pm.c b/drivers/crypto/ccree/cc_pm.c
new file mode 100644
index 000000000..6124fbbbe
--- /dev/null
+++ b/drivers/crypto/ccree/cc_pm.c
@@ -0,0 +1,82 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (C) 2012-2019 ARM Limited (or its affiliates). */
+
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/pm_runtime.h>
+#include "cc_driver.h"
+#include "cc_buffer_mgr.h"
+#include "cc_request_mgr.h"
+#include "cc_sram_mgr.h"
+#include "cc_hash.h"
+#include "cc_pm.h"
+#include "cc_fips.h"
+
+#define POWER_DOWN_ENABLE 0x01
+#define POWER_DOWN_DISABLE 0x00
+
+static int cc_pm_suspend(struct device *dev)
+{
+	struct cc_drvdata *drvdata = dev_get_drvdata(dev);
+
+	dev_dbg(dev, "set HOST_POWER_DOWN_EN\n");
+	fini_cc_regs(drvdata);
+	cc_iowrite(drvdata, CC_REG(HOST_POWER_DOWN_EN), POWER_DOWN_ENABLE);
+	clk_disable_unprepare(drvdata->clk);
+	return 0;
+}
+
+static int cc_pm_resume(struct device *dev)
+{
+	int rc;
+	struct cc_drvdata *drvdata = dev_get_drvdata(dev);
+
+	dev_dbg(dev, "unset HOST_POWER_DOWN_EN\n");
+	/* Enables the device source clk */
+	rc = clk_prepare_enable(drvdata->clk);
+	if (rc) {
+		dev_err(dev, "failed getting clock back on. We're toast.\n");
+		return rc;
+	}
+	/* wait for Cryptocell reset completion */
+	if (!cc_wait_for_reset_completion(drvdata)) {
+		dev_err(dev, "Cryptocell reset not completed");
+		clk_disable_unprepare(drvdata->clk);
+		return -EBUSY;
+	}
+
+	cc_iowrite(drvdata, CC_REG(HOST_POWER_DOWN_EN), POWER_DOWN_DISABLE);
+	rc = init_cc_regs(drvdata);
+	if (rc) {
+		dev_err(dev, "init_cc_regs (%x)\n", rc);
+		clk_disable_unprepare(drvdata->clk);
+		return rc;
+	}
+	/* check if tee fips error occurred during power down */
+	cc_tee_handle_fips_error(drvdata);
+
+	cc_init_hash_sram(drvdata);
+
+	return 0;
+}
+
+const struct dev_pm_ops ccree_pm = {
+	SET_RUNTIME_PM_OPS(cc_pm_suspend, cc_pm_resume, NULL)
+};
+
+int cc_pm_get(struct device *dev)
+{
+	int rc = pm_runtime_get_sync(dev);
+	if (rc < 0) {
+		pm_runtime_put_noidle(dev);
+		return rc;
+	}
+
+	return 0;
+}
+
+void cc_pm_put_suspend(struct device *dev)
+{
+	pm_runtime_mark_last_busy(dev);
+	pm_runtime_put_autosuspend(dev);
+}