Merge pull request #1032 from soby-mathew/sm/css_scp_reorg

Reorganise CSS SCP bootloader layer

include/plat/arm/css/common/css_def.h

@@ -128,16 +128,22 @@
  * an SCP_BL2/SCP_BL2U image.
  */
 #if CSS_LOAD_SCP_IMAGES
+
+#if ARM_BL31_IN_DRAM
+#error "SCP_BL2 is not expected to be loaded by BL2 for ARM_BL31_IN_DRAM config"
+#endif
+
 /*
  * Load address of SCP_BL2 in CSS platform ports
- * SCP_BL2 is loaded to the same place as BL31.  Once SCP_BL2 is transferred to the
- * SCP, it is discarded and BL31 is loaded over the top.
+ * SCP_BL2 is loaded to the same place as BL31 but it shouldn't overwrite BL1
+ * rw data.  Once SCP_BL2 is transferred to the SCP, it is discarded and BL31
+ * is loaded over the top.
  */
-#define SCP_BL2_BASE			BL31_BASE
-#define SCP_BL2_LIMIT			(SCP_BL2_BASE + PLAT_CSS_MAX_SCP_BL2_SIZE)
+#define SCP_BL2_BASE			(BL1_RW_BASE - PLAT_CSS_MAX_SCP_BL2_SIZE)
+#define SCP_BL2_LIMIT			BL1_RW_BASE
 
-#define SCP_BL2U_BASE			BL31_BASE
-#define SCP_BL2U_LIMIT			(SCP_BL2U_BASE + PLAT_CSS_MAX_SCP_BL2U_SIZE)
+#define SCP_BL2U_BASE			(BL1_RW_BASE - PLAT_CSS_MAX_SCP_BL2U_SIZE)
+#define SCP_BL2U_LIMIT			BL1_RW_BASE
 #endif /* CSS_LOAD_SCP_IMAGES */
 
 /* Load address of Non-Secure Image for CSS platform ports */

plat/arm/board/juno/include/platform_def.h

 /*
- * Copyright (c) 2014-2016, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2014-2017, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -106,7 +106,7 @@
  * little space for growth.
  */
 #if TRUSTED_BOARD_BOOT
-# define PLAT_ARM_MAX_BL2_SIZE		0x1D000
+# define PLAT_ARM_MAX_BL2_SIZE		0x18000
 #else
 # define PLAT_ARM_MAX_BL2_SIZE		0xC000
 #endif
@@ -172,13 +172,13 @@
  * PLAT_CSS_MAX_SCP_BL2_SIZE is calculated using the current
  * SCP_BL2 size plus a little space for growth.
  */
-#define PLAT_CSS_MAX_SCP_BL2_SIZE	0x1D000
+#define PLAT_CSS_MAX_SCP_BL2_SIZE	0x14000
 
 /*
  * PLAT_CSS_MAX_SCP_BL2U_SIZE is calculated using the current
  * SCP_BL2U size plus a little space for growth.
  */
-#define PLAT_CSS_MAX_SCP_BL2U_SIZE	0x1D000
+#define PLAT_CSS_MAX_SCP_BL2U_SIZE	0x14000
 
 /*
  * Define a list of Group 1 Secure and Group 0 interrupts as per GICv3

plat/arm/css/common/css_bl2_setup.c

@@ -11,7 +11,7 @@
 #include <plat_arm.h>
 #include <string.h>
 #include <utils.h>
-#include "css_scp_bootloader.h"
+#include "../drivers/scp/css_scp.h"
 
 /* Weak definition may be overridden in specific CSS based platform */
 #if LOAD_IMAGE_V2
@@ -34,9 +34,12 @@ int bl2_plat_handle_scp_bl2(image_info_t *scp_bl2_image_info)
 
 	INFO("BL2: Initiating SCP_BL2 transfer to SCP\n");
 
-	ret = scp_bootloader_transfer((void *)scp_bl2_image_info->image_base,
+	ret = css_scp_boot_image_xfer((void *)scp_bl2_image_info->image_base,
 		scp_bl2_image_info->image_size);
 
+	if (ret == 0)
+		ret = css_scp_boot_ready();
+
 	if (ret == 0)
 		INFO("BL2: SCP_BL2 transferred to SCP\n");
 	else

plat/arm/css/common/css_bl2u_setup.c

 /*
- * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -7,7 +7,7 @@
 #include <bl_common.h>
 #include <debug.h>
 #include <plat_arm.h>
-#include "css_scp_bootloader.h"
+#include "../drivers/scp/css_scp.h"
 
 /* Weak definition may be overridden in specific CSS based platform */
 #pragma weak bl2u_plat_handle_scp_bl2u
@@ -40,9 +40,12 @@ int bl2u_plat_handle_scp_bl2u(void)
 
 	INFO("BL2U: Initiating SCP_BL2U transfer to SCP\n");
 
-	ret = scp_bootloader_transfer((void *)scp_bl2u_image_info.image_base,
+	ret = css_scp_boot_image_xfer((void *)scp_bl2u_image_info.image_base,
 		scp_bl2u_image_info.image_size);
 
+	if (ret == 0)
+		ret = css_scp_boot_ready();
+
 	if (ret == 0)
 		INFO("BL2U: SCP_BL2U transferred to SCP\n");
 	else

plat/arm/css/common/css_common.mk

@@ -56,8 +56,8 @@ ifeq (${CSS_LOAD_SCP_IMAGES},1)
     $(eval $(call FWU_FIP_ADD_IMG,SCP_BL2U,--scp-fwu-cfg))
   endif
 
-  BL2U_SOURCES		+=	plat/arm/css/common/css_scp_bootloader.c
-  BL2_SOURCES		+=	plat/arm/css/common/css_scp_bootloader.c
+  BL2U_SOURCES		+=	plat/arm/css/drivers/scp/css_bom_bootloader.c
+  BL2_SOURCES		+=	plat/arm/css/drivers/scp/css_bom_bootloader.c
 endif
 
 # Enable option to detect whether the SCP ROM firmware in use predates version

plat/arm/css/common/css_scp_bootloader.h

-/*
- * Copyright (c) 2014, ARM Limited and Contributors. All rights reserved.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- */
-
-#ifndef __CSS_SCP_BOOTLOADER_H__
-#define __CSS_SCP_BOOTLOADER_H__
-
-int scp_bootloader_transfer(void *image, unsigned int image_size);
-
-#endif /* __CSS_SCP_BOOTLOADER_H__ */

plat/arm/css/common/css_scp_bootloader.c → plat/arm/css/drivers/scp/css_bom_bootloader.c

 /*
- * Copyright (c) 2014-2016, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2014-2017, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
 #include <arch_helpers.h>
 #include <assert.h>
+#include <cassert.h>
 #include <css_def.h>
 #include <debug.h>
 #include <platform.h>
 #include <stdint.h>
-#include "../drivers/scpi/css_mhu.h"
-#include "../drivers/scpi/css_scpi.h"
-#include "css_scp_bootloader.h"
+#include "../scpi/css_mhu.h"
 
 /* ID of the MHU slot used for the BOM protocol */
 #define BOM_MHU_SLOT_ID		0
@@ -46,6 +45,18 @@ typedef struct {
 	uint32_t block_size;
 } cmd_data_payload_t;
 
+/*
+ * All CSS platforms load SCP_BL2/SCP_BL2U just below BL rw-data and above
+ * BL2/BL2U (this is where BL31 usually resides except when ARM_BL31_IN_DRAM is
+ * set. Ensure that SCP_BL2/SCP_BL2U do not overflow into BL1 rw-data nor
+ * BL2/BL2U.
+ */
+CASSERT(SCP_BL2_LIMIT <= BL1_RW_BASE, assert_scp_bl2_overwrite_bl1);
+CASSERT(SCP_BL2U_LIMIT <= BL1_RW_BASE, assert_scp_bl2u_overwrite_bl1);
+
+CASSERT(SCP_BL2_BASE >= BL2_LIMIT, assert_scp_bl2_overwrite_bl2);
+CASSERT(SCP_BL2U_BASE >= BL2U_LIMIT, assert_scp_bl2u_overwrite_bl2u);
+
 static void scp_boot_message_start(void)
 {
 	mhu_secure_message_start(BOM_MHU_SLOT_ID);
@@ -88,7 +99,7 @@ static void scp_boot_message_end(void)
 	mhu_secure_message_end(BOM_MHU_SLOT_ID);
 }
 
-int scp_bootloader_transfer(void *image, unsigned int image_size)
+int css_scp_boot_image_xfer(void *image, unsigned int image_size)
 {
 	uint32_t response;
 	uint32_t checksum;
@@ -170,8 +181,5 @@ int scp_bootloader_transfer(void *image, unsigned int image_size)
 		return -1;
 	}
 
-	VERBOSE("Waiting for SCP to signal it is ready to go on\n");
-
-	/* Wait for SCP to signal it's ready */
-	return scpi_wait_ready();
+	return 0;
 }

plat/arm/css/drivers/scp/css_scp.h

 /*
- * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2016-2017, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -7,13 +7,31 @@
 #ifndef __CSS_SCP_H__
 #define __CSS_SCP_H__
 
-#include <psci.h>
+#include <types.h>
+#include "../scpi/css_scpi.h"
 
-void css_scp_suspend(const psci_power_state_t *target_state);
-void css_scp_off(const psci_power_state_t *target_state);
+/* Forward declarations */
+struct psci_power_state;
+
+/* API for power management by SCP */
+void css_scp_suspend(const struct psci_power_state *target_state);
+void css_scp_off(const struct psci_power_state *target_state);
 void css_scp_on(u_register_t mpidr);
 int css_scp_get_power_state(u_register_t mpidr, unsigned int power_level);
 void __dead2 css_scp_sys_shutdown(void);
 void __dead2 css_scp_sys_reboot(void);
 
+/* API for SCP Boot Image transfer. Return 0 on success, -1 on error */
+int css_scp_boot_image_xfer(void *image, unsigned int image_size);
+
+/*
+ * API to wait for SCP to signal till it's ready after booting the transferred
+ * image.
+ */
+static inline int css_scp_boot_ready(void)
+{
+	VERBOSE("Waiting for SCP to signal it is ready to go on\n");
+	return scpi_wait_ready();
+}
+
 #endif	/* __CSS_SCP_H__ */

plat/arm/css/drivers/scpi/css_scpi.h

 /*
- * Copyright (c) 2014-2016, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2014-2017, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -97,8 +97,8 @@ typedef enum {
 	scpi_system_reset = 2
 } scpi_system_state_t;
 
-extern int scpi_wait_ready(void);
-extern void scpi_set_css_power_state(unsigned int mpidr,
+int scpi_wait_ready(void);
+void scpi_set_css_power_state(unsigned int mpidr,
 				scpi_power_state_t cpu_state,
 				scpi_power_state_t cluster_state,
 				scpi_power_state_t css_state);