Separate CSS security setup from SOC security setup

Currently, on ARM platforms(ex. Juno) non-secure access to specific
peripheral regions, config registers which are inside and outside CSS
is done in the soc_css_security_setup(). This patch separates the CSS
security setup from the SOC security setup in the css_security_setup().

The CSS security setup involves programming of the internal NIC to
provide access to regions inside the CSS. This is needed only in
Juno, hence Juno implements it in its board files as css_init_nic400().

Change-Id: I95a1fb9f13f9b18fa8e915eb4ae2f15264f1b060

include/drivers/arm/nic_400.h

+/*
+ * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * Neither the name of ARM nor the names of its contributors may be used
+ * to endorse or promote products derived from this software without specific
+ * prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __NIC_400_H__
+#define __NIC_400_H__
+
+/*
+ * Address of slave 'n' security setting in the NIC-400 address region
+ * control
+ */
+#define NIC400_ADDR_CTRL_SECURITY_REG(n)	(0x8 + (n) * 4)
+
+#endif /* __NIC_400_H__ */

plat/arm/board/juno/juno_security.c

@@ -29,6 +29,7 @@
  */
 
 #include <mmio.h>
+#include <nic_400.h>
 #include <plat_arm.h>
 #include <soc_css.h>
 #include "juno_def.h"
@@ -47,6 +48,17 @@ static void init_mmu401(void)
 	mmio_write_32(MMU401_DMA330_BASE + MMU401_SSD_OFFSET, reg);
 }
 
+/*******************************************************************************
+ * Program CSS-NIC400 to allow non-secure access to some CSS regions.
+ ******************************************************************************/
+static void css_init_nic400(void)
+{
+	/* Note: This is the NIC-400 device on the CSS */
+	mmio_write_32(PLAT_SOC_CSS_NIC400_BASE +
+		NIC400_ADDR_CTRL_SECURITY_REG(CSS_NIC400_SLAVE_BOOTSECURE),
+		~0);
+}
+
 /*******************************************************************************
  * Initialize the secure environment.
  ******************************************************************************/
@@ -54,6 +66,8 @@ void plat_arm_security_setup(void)
 {
 	/* Initialize the TrustZone Controller */
 	arm_tzc_setup();
+	/* Do ARM CSS internal NIC setup */
+	css_init_nic400();
 	/* Do ARM CSS SoC security setup */
 	soc_css_security_setup();
 	/* Initialize the SMMU SSD tables*/

plat/arm/soc/common/soc_css_security.c

@@ -30,17 +30,10 @@
 
 #include <board_css_def.h>
 #include <mmio.h>
+#include <nic_400.h>
 #include <platform_def.h>
 #include <soc_css_def.h>
 
-/*
- * Address of slave 'n' security setting in the NIC-400 address region
- * control
- * TODO: Ideally this macro should be moved in a "nic-400.h" header file but
- * it would be the only thing in there so it's not worth it at the moment.
- */
-#define NIC400_ADDR_CTRL_SECURITY_REG(n)	(0x8 + (n) * 4)
-
 void soc_css_init_nic400(void)
 {
 	/*
@@ -70,13 +63,6 @@ void soc_css_init_nic400(void)
 		NIC400_ADDR_CTRL_SECURITY_REG(SOC_CSS_NIC400_BOOTSEC_BRIDGE),
 		~SOC_CSS_NIC400_BOOTSEC_BRIDGE_UART1);
 
-	/*
-	 * Allow non-secure access to some CSS regions.
-	 * Note: This is the NIC-400 device on the CSS
-	 */
-	mmio_write_32(PLAT_SOC_CSS_NIC400_BASE +
-		NIC400_ADDR_CTRL_SECURITY_REG(CSS_NIC400_SLAVE_BOOTSECURE),
-		~0);
 }