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path: root/drivers/crypto/ccree/cc_pm.c
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Diffstat (limited to 'drivers/crypto/ccree/cc_pm.c')
-rw-r--r--drivers/crypto/ccree/cc_pm.c108
1 files changed, 108 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..2df2c2ca8
--- /dev/null
+++ b/drivers/crypto/ccree/cc_pm.c
@@ -0,0 +1,108 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (C) 2012-2018 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_ivgen.h"
+#include "cc_hash.h"
+#include "cc_pm.h"
+#include "cc_fips.h"
+
+#define POWER_DOWN_ENABLE 0x01
+#define POWER_DOWN_DISABLE 0x00
+
+const struct dev_pm_ops ccree_pm = {
+ SET_RUNTIME_PM_OPS(cc_pm_suspend, cc_pm_resume, NULL)
+};
+
+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);
+ cc_clk_off(drvdata);
+ return 0;
+}
+
+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 = cc_clk_on(drvdata);
+ if (rc) {
+ dev_err(dev, "failed getting clock back on. We're toast.\n");
+ return rc;
+ }
+
+ cc_iowrite(drvdata, CC_REG(HOST_POWER_DOWN_EN), POWER_DOWN_DISABLE);
+ rc = init_cc_regs(drvdata, false);
+ if (rc) {
+ dev_err(dev, "init_cc_regs (%x)\n", rc);
+ return rc;
+ }
+ /* check if tee fips error occurred during power down */
+ cc_tee_handle_fips_error(drvdata);
+
+ cc_init_hash_sram(drvdata);
+
+ cc_init_iv_sram(drvdata);
+ return 0;
+}
+
+int cc_pm_get(struct device *dev)
+{
+ int rc = 0;
+ struct cc_drvdata *drvdata = dev_get_drvdata(dev);
+
+ if (drvdata->pm_on)
+ rc = pm_runtime_get_sync(dev);
+
+ return (rc == 1 ? 0 : rc);
+}
+
+int cc_pm_put_suspend(struct device *dev)
+{
+ int rc = 0;
+ struct cc_drvdata *drvdata = dev_get_drvdata(dev);
+
+ if (drvdata->pm_on) {
+ pm_runtime_mark_last_busy(dev);
+ rc = pm_runtime_put_autosuspend(dev);
+ }
+
+ return rc;
+}
+
+int cc_pm_init(struct cc_drvdata *drvdata)
+{
+ struct device *dev = drvdata_to_dev(drvdata);
+
+ /* must be before the enabling to avoid resdundent suspending */
+ pm_runtime_set_autosuspend_delay(dev, CC_SUSPEND_TIMEOUT);
+ pm_runtime_use_autosuspend(dev);
+ /* set us as active - note we won't do PM ops until cc_pm_go()! */
+ return pm_runtime_set_active(dev);
+}
+
+/* enable the PM module*/
+void cc_pm_go(struct cc_drvdata *drvdata)
+{
+ pm_runtime_enable(drvdata_to_dev(drvdata));
+ drvdata->pm_on = true;
+}
+
+void cc_pm_fini(struct cc_drvdata *drvdata)
+{
+ pm_runtime_disable(drvdata_to_dev(drvdata));
+ drvdata->pm_on = false;
+}