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, 60 insertions, 0 deletions

diff --git a/drivers/staging/ccree/ssi_pm_ext.c b/drivers/staging/ccree/ssi_pm_ext.c
new file mode 100644
index 000000000000..f86bbab22073
--- /dev/null
+++ b/drivers/staging/ccree/ssi_pm_ext.c
@@ -0,0 +1,60 @@
+/*
+ * 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_sram_mgr.h"
+#include "ssi_pm_ext.h"
+
+/*
+This function should suspend the HW (if possiable), It should be implemented by 
+the driver user. 
+The reference code clears the internal SRAM to imitate lose of state. 
+*/
+void ssi_pm_ext_hw_suspend(struct device *dev)
+{
+	struct ssi_drvdata *drvdata =
+		(struct ssi_drvdata *)dev_get_drvdata(dev);
+	unsigned int val;
+	void __iomem *cc_base = drvdata->cc_base;
+	unsigned int  sram_addr = 0;
+
+	CC_HAL_WRITE_REGISTER(CC_REG_OFFSET(HOST_RGF, SRAM_ADDR), sram_addr);
+
+	for (;sram_addr < SSI_CC_SRAM_SIZE ; sram_addr+=4) {
+		CC_HAL_WRITE_REGISTER(CC_REG_OFFSET(HOST_RGF, SRAM_DATA), 0x0);
+
+		do {
+			val = CC_HAL_READ_REGISTER(CC_REG_OFFSET(HOST_RGF, SRAM_DATA_READY));
+		} while (!(val &0x1));
+	}
+}
+
+/*
+This function should resume the HW (if possiable).It should be implemented by 
+the driver user. 
+*/
+void ssi_pm_ext_hw_resume(struct device *dev)
+{
+	return;
+}
+