Reduce deep nesting of header files

Reduce the number of header files included from other header
files as much as possible without splitting the files. Use forward
declarations where possible. This allows removal of some unnecessary
"#ifndef __ASSEMBLY__" statements.

Also, review the .c and .S files for which header files really need
including and reorder the #include statements alphabetically.

Fixes ARM-software/tf-issues#31

Change-Id: Iec92fb976334c77453e010b60bcf56f3be72bd3e

include/drivers/arm/tzc400.h

@@ -147,8 +147,6 @@
 /* Filters are bit mapped 0 to 3. */
 #define TZC400_COMPONENT_ID	0xb105f00d
 
-#ifndef __ASSEMBLY__
-
 /*******************************************************************************
  * Function & variable prototypes
  ******************************************************************************/
@@ -205,6 +203,5 @@ void tzc_enable_filters(const tzc_instance_t *controller);
 void tzc_disable_filters(const tzc_instance_t *controller);
 void tzc_set_action(const tzc_instance_t *controller, tzc_action_t action);
 
-#endif /*__ASSEMBLY__*/
 
 #endif /* __TZC400__ */

include/drivers/io_driver.h

@@ -31,7 +31,9 @@
 #ifndef __IO_DRIVER_H__
 #define __IO_DRIVER_H__
 
+#include <io_storage.h>
 #include <platform.h>   /* For MAX_IO_DEVICES */
+#include <stdint.h>
 
 
 /* Generic IO entity structure,representing an accessible IO construct on the

include/drivers/io_fip.h

@@ -31,6 +31,8 @@
 #ifndef __IO_FIP_H__
 #define __IO_FIP_H__
 
+struct io_dev_connector;
+
 int register_io_dev_fip(struct io_dev_connector **dev_con);
 
 #endif /* __IO_FIP_H__ */

include/drivers/io_memmap.h

@@ -31,6 +31,8 @@
 #ifndef __IO_MEMMAP_H__
 #define __IO_MEMMAP_H__
 
+struct io_dev_connector;
+
 int register_io_dev_memmap(struct io_dev_connector **dev_con);
 
 #endif /* __IO_MEMMAP_H__ */

include/drivers/io_semihosting.h

@@ -31,6 +31,8 @@
 #ifndef __IO_SH_H__
 #define __IO_SH_H__
 
+struct io_dev_connector;
+
 int register_io_dev_sh(struct io_dev_connector **dev_con);
 
 #endif /* __IO_SH_H__ */

include/lib/aarch64/arch.h

@@ -31,7 +31,6 @@
 #ifndef __ARCH_H__
 #define __ARCH_H__
 
-#include <bl_common.h>
 
 /*******************************************************************************
  * MIDR bit definitions

include/lib/aarch64/arch_helpers.h

@@ -31,10 +31,8 @@
 #ifndef __ARCH_HELPERS_H__
 #define __ARCH_HELPERS_H__
 
-#include <arch.h>
+#include <cdefs.h> /* For __dead2 */
 
-#ifndef __ASSEMBLY__
-#include <stdio.h>
 
 /*******************************************************************************
  * Aarch64 translation tables manipulation helper prototypes
@@ -268,6 +266,5 @@ extern void write_cpuectlr(unsigned long);
 extern void write_cptr_el2(unsigned long);
 extern void write_cptr_el3(unsigned long);
 
-#endif /*__ASSEMBLY__*/
 
 #endif /* __ARCH_HELPERS_H__ */

include/lib/bakery_lock.h

@@ -35,7 +35,6 @@
 
 #define BAKERY_LOCK_MAX_CPUS		PLATFORM_CORE_COUNT
 
-#ifndef __ASSEMBLY__
 typedef struct bakery_lock {
 	int owner;
 	volatile char entering[BAKERY_LOCK_MAX_CPUS];
@@ -48,6 +47,5 @@ void bakery_lock_init(bakery_lock_t *bakery);
 void bakery_lock_get(unsigned long mpidr, bakery_lock_t *bakery);
 void bakery_lock_release(unsigned long mpidr, bakery_lock_t *bakery);
 int bakery_lock_try(unsigned long mpidr, bakery_lock_t *bakery);
-#endif /*__ASSEMBLY__*/
 
 #endif /* __BAKERY_LOCK_H__ */

include/lib/io_storage.h

@@ -31,9 +31,6 @@
 #ifndef __IO_H__
 #define __IO_H__
 
-#ifndef __ASSEMBLY__
-
-#include <stdint.h>
 #include <stdio.h> /* For ssize_t */
 
 
@@ -128,5 +125,4 @@ int io_write(io_handle handle, const void *buffer, size_t length,
 int io_close(io_handle handle);
 
 
-#endif /* __ASSEMBLY__ */
 #endif /* __IO_H__ */

include/lib/mmio.h

@@ -31,8 +31,6 @@
 #ifndef __MMIO_H__
 #define __MMIO_H__
 
-#ifndef __ASSEMBLY__
-
 #include <stdint.h>
 
 extern void mmio_write_8(uintptr_t addr, uint8_t value);
@@ -44,6 +42,4 @@ extern uint32_t mmio_read_32(uintptr_t addr);
 extern void mmio_write_64(uintptr_t addr, uint64_t value);
 extern uint64_t mmio_read_64(uintptr_t addr);
 
-#endif /*__ASSEMBLY__*/
-
 #endif /* __MMIO_H__ */

include/lib/semihosting.h

@@ -31,6 +31,9 @@
 #ifndef __SEMIHOSTING_H__
 #define __SEMIHOSTING_H__
 
+#include <stdio.h> /* For ssize_t */
+
+
 #define SEMIHOSTING_SYS_OPEN            0x01
 #define SEMIHOSTING_SYS_CLOSE           0x02
 #define SEMIHOSTING_SYS_WRITE0          0x04

lib/aarch64/cache_helpers.S

@@ -28,7 +28,7 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include <arch_helpers.h>
+#include <arch.h>
 #include <asm_macros.S>
 
 	.globl	dcisw

lib/aarch64/misc_helpers.S

@@ -28,8 +28,7 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include <arch_helpers.h>
-#include <runtime_svc.h>
+#include <arch.h>
 #include <asm_macros.S>
 
 	.globl	enable_irq

lib/aarch64/sysreg_helpers.S

@@ -28,7 +28,7 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include <arch_helpers.h>
+#include <arch.h>
 #include <asm_macros.S>
 
 	.globl	read_vbar_el1

lib/aarch64/tlb_helpers.S

@@ -28,7 +28,6 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include <arch_helpers.h>
 #include <asm_macros.S>
 
 	.globl	tlbialle1

lib/aarch64/xlat_helpers.c

@@ -28,9 +28,8 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include <string.h>
-#include <assert.h>
 #include <arch.h>
+#include <assert.h>
 
 /*******************************************************************************
  * Helper to create a level 1/2 table descriptor which points to a level 2/3

lib/io_storage.c

@@ -28,11 +28,10 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
-
-#include <stddef.h>
 #include <assert.h>
-#include <io_storage.h>
 #include <io_driver.h>
+#include <io_storage.h>
+#include <stddef.h>
 
 
 #define MAX_DEVICES(plat_data)						\

lib/locks/bakery/bakery_lock.c

@@ -28,11 +28,10 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
+#include <arch_helpers.h>
 #include <assert.h>
-#include <string.h>
-
 #include <bakery_lock.h>
-#include <arch_helpers.h>
+#include <string.h>
 
 /*
  * Functions in this file implement Bakery Algorithm for mutual exclusion.

lib/semihosting/semihosting.c

@@ -29,10 +29,9 @@
  */
 
 #include <assert.h>
-#include <string.h>
 #include <errno.h>
-#include <stdio.h>
 #include <semihosting.h>
+#include <string.h>
 
 #ifndef SEMIHOSTING_SUPPORTED
 #define SEMIHOSTING_SUPPORTED  1

plat/common/aarch64/platform_helpers.S

@@ -29,8 +29,8 @@
  */
 
 #include <arch.h>
-#include <platform.h>
 #include <asm_macros.S>
+#include <platform.h>
 
 
 	.weak	platform_get_core_pos