staging: ccree: introduce CryptoCell HW driver

Introduce basic low level Arm TrustZone CryptoCell HW support.
This first patch doesn't actually register any Crypto API
transformations, these will follow up in the next patch.

This first revision supports the CC 712 REE component.

Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 144 insertions, 0 deletions

diff --git a/drivers/staging/ccree/ssi_pm.c b/drivers/staging/ccree/ssi_pm.c
new file mode 100644
index 000000000000..1f34e68670df
--- /dev/null
+++ b/drivers/staging/ccree/ssi_pm.c
@@ -0,0 +1,144 @@
+/*
+ * Copyright (C) 2012-2017 ARM Limited or its affiliates.
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+#include "ssi_config.h"
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <crypto/ctr.h>
+#include <linux/pm_runtime.h>
+#include "ssi_driver.h"
+#include "ssi_buffer_mgr.h"
+#include "ssi_request_mgr.h"
+#include "ssi_sram_mgr.h"
+#include "ssi_sysfs.h"
+#include "ssi_pm.h"
+#include "ssi_pm_ext.h"
+
+
+#if defined (CONFIG_PM_RUNTIME) || defined (CONFIG_PM_SLEEP)
+
+#define POWER_DOWN_ENABLE 0x01
+#define POWER_DOWN_DISABLE 0x00
+
+
+int ssi_power_mgr_runtime_suspend(struct device *dev)
+{
+	struct ssi_drvdata *drvdata =
+		(struct ssi_drvdata *)dev_get_drvdata(dev);
+	int rc;
+
+	SSI_LOG_DEBUG("ssi_power_mgr_runtime_suspend: set HOST_POWER_DOWN_EN\n");
+	WRITE_REGISTER(drvdata->cc_base + CC_REG_OFFSET(HOST_RGF, HOST_POWER_DOWN_EN), POWER_DOWN_ENABLE);
+	rc = ssi_request_mgr_runtime_suspend_queue(drvdata);
+	if (rc != 0) {
+		SSI_LOG_ERR("ssi_request_mgr_runtime_suspend_queue (%x)\n", rc);
+		return rc;
+	}
+	fini_cc_regs(drvdata);
+
+	/* Specific HW suspend code */
+	ssi_pm_ext_hw_suspend(dev);
+	return 0;
+}
+
+int ssi_power_mgr_runtime_resume(struct device *dev)
+{
+	int rc;
+	struct ssi_drvdata *drvdata =
+		(struct ssi_drvdata *)dev_get_drvdata(dev);
+
+	SSI_LOG_DEBUG("ssi_power_mgr_runtime_resume , unset HOST_POWER_DOWN_EN\n");
+	WRITE_REGISTER(drvdata->cc_base + CC_REG_OFFSET(HOST_RGF, HOST_POWER_DOWN_EN), POWER_DOWN_DISABLE);
+	/* Specific HW resume code */
+	ssi_pm_ext_hw_resume(dev);
+
+	rc = init_cc_regs(drvdata, false);
+	if (rc !=0) {
+		SSI_LOG_ERR("init_cc_regs (%x)\n",rc);
+		return rc;
+	}
+
+	rc = ssi_request_mgr_runtime_resume_queue(drvdata);
+	if (rc !=0) {
+		SSI_LOG_ERR("ssi_request_mgr_runtime_resume_queue (%x)\n",rc);
+		return rc;
+	}
+
+	return 0;
+}
+
+int ssi_power_mgr_runtime_get(struct device *dev)
+{
+	int rc = 0;
+
+	if (ssi_request_mgr_is_queue_runtime_suspend(
+				(struct ssi_drvdata *)dev_get_drvdata(dev))) {
+		rc = pm_runtime_get_sync(dev);
+	} else {
+		pm_runtime_get_noresume(dev);
+	}
+	return rc;
+}
+
+int ssi_power_mgr_runtime_put_suspend(struct device *dev)
+{
+	int rc = 0;
+
+	if (!ssi_request_mgr_is_queue_runtime_suspend(
+				(struct ssi_drvdata *)dev_get_drvdata(dev))) {
+		pm_runtime_mark_last_busy(dev);
+		rc = pm_runtime_put_autosuspend(dev);
+	}
+	else {
+		/* Something wrong happens*/
+		BUG();
+	}
+	return rc;
+
+}
+
+#endif
+
+
+
+int ssi_power_mgr_init(struct ssi_drvdata *drvdata)
+{
+	int rc = 0;
+#if defined (CONFIG_PM_RUNTIME) || defined (CONFIG_PM_SLEEP)
+	struct platform_device *plat_dev = drvdata->plat_dev;
+	/* must be before the enabling to avoid resdundent suspending */
+	pm_runtime_set_autosuspend_delay(&plat_dev->dev,SSI_SUSPEND_TIMEOUT);
+	pm_runtime_use_autosuspend(&plat_dev->dev);
+	/* activate the PM module */
+	rc = pm_runtime_set_active(&plat_dev->dev);
+	if (rc != 0)
+		return rc;
+	/* enable the PM module*/
+	pm_runtime_enable(&plat_dev->dev);
+#endif
+	return rc;
+}
+
+void ssi_power_mgr_fini(struct ssi_drvdata *drvdata)
+{
+#if defined (CONFIG_PM_RUNTIME) || defined (CONFIG_PM_SLEEP)
+	struct platform_device *plat_dev = drvdata->plat_dev;
+
+	pm_runtime_disable(&plat_dev->dev);
+#endif
+}