bsps/arm: Change code to explicit selection of cache implementation for ARM BSPs.

The original ARM architecture wide cache_.h is changed to dummy version
for targets not implementing/enablig cache at all.

The ARM targets equipped by cache should include
appropriate implementation.

Next options are available for now

c/src/lib/libbsp/arm/shared/armv467ar-basic-cache/cache_.h
  basic ARM cache integrated on the CPU core directly
  which requires only CP15 oparations

c/src/lib/libbsp/arm/shared/arm-l2c-310/cache_.h
  support for case where ARM L2C-310 cache controller
  is used. It is accessible as mmaped peripheral.

c/src/lib/libbsp/arm/shared/armv7m/include/cache_.h
  Cortex-M specific cache support

Updates #2782
Updates #2783

1 files changed, 134 insertions, 0 deletions

diff --git a/c/src/lib/libbsp/arm/shared/armv467ar-basic-cache/cache_.h b/c/src/lib/libbsp/arm/shared/armv467ar-basic-cache/cache_.h
new file mode 100644
index 0000000000..bc19cb7cad
--- /dev/null
+++ b/c/src/lib/libbsp/arm/shared/armv467ar-basic-cache/cache_.h
@@ -0,0 +1,134 @@
+/**
+ * @file
+ *
+ * @ingroup arm
+ *
+ * @brief ARM cache defines and implementation.
+ */
+
+/*
+ * Copyright (c) 2009-2011 embedded brains GmbH.  All rights reserved.
+ *
+ *  embedded brains GmbH
+ *  Obere Lagerstr. 30
+ *  82178 Puchheim
+ *  Germany
+ *  <rtems@embedded-brains.de>
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.org/license/LICENSE.
+ */
+
+#ifndef LIBBSP_ARM_ARMV467AR_BASIC_CACHE_H
+#define LIBBSP_ARM_ARMV467AR_BASIC_CACHE_H
+
+#include <libcpu/arm-cp15.h>
+
+#define CPU_DATA_CACHE_ALIGNMENT 32
+#define CPU_INSTRUCTION_CACHE_ALIGNMENT 32
+#if defined(__ARM_ARCH_7A__)
+/* Some/many ARM Cortex-A cores have L1 data line lenght 64 bytes */
+#define CPU_MAXIMAL_CACHE_ALIGNMENT 64
+#endif
+
+static inline void _CPU_cache_flush_1_data_line(const void *d_addr)
+{
+  arm_cp15_data_cache_clean_line(d_addr);
+}
+
+static inline void _CPU_cache_invalidate_1_data_line(const void *d_addr)
+{
+  arm_cp15_data_cache_invalidate_line(d_addr);
+}
+
+static inline void _CPU_cache_freeze_data(void)
+{
+  /* TODO */
+}
+
+static inline void _CPU_cache_unfreeze_data(void)
+{
+  /* TODO */
+}
+
+static inline void _CPU_cache_invalidate_1_instruction_line(const void *d_addr)
+{
+  arm_cp15_instruction_cache_invalidate_line(d_addr);
+}
+
+static inline void _CPU_cache_freeze_instruction(void)
+{
+  /* TODO */
+}
+
+static inline void _CPU_cache_unfreeze_instruction(void)
+{
+  /* TODO */
+}
+
+static inline void _CPU_cache_flush_entire_data(void)
+{
+  arm_cp15_data_cache_test_and_clean();
+}
+
+static inline void _CPU_cache_invalidate_entire_data(void)
+{
+  arm_cp15_data_cache_invalidate();
+}
+
+static inline void _CPU_cache_enable_data(void)
+{
+  rtems_interrupt_level level;
+  uint32_t ctrl;
+
+  rtems_interrupt_disable(level);
+  ctrl = arm_cp15_get_control();
+  ctrl |= ARM_CP15_CTRL_C;
+  arm_cp15_set_control(ctrl);
+  rtems_interrupt_enable(level);
+}
+
+static inline void _CPU_cache_disable_data(void)
+{
+  rtems_interrupt_level level;
+  uint32_t ctrl;
+
+  rtems_interrupt_disable(level);
+  arm_cp15_data_cache_test_and_clean_and_invalidate();
+  ctrl = arm_cp15_get_control();
+  ctrl &= ~ARM_CP15_CTRL_C;
+  arm_cp15_set_control(ctrl);
+  rtems_interrupt_enable(level);
+}
+
+static inline void _CPU_cache_invalidate_entire_instruction(void)
+{
+  arm_cp15_instruction_cache_invalidate();
+}
+
+static inline void _CPU_cache_enable_instruction(void)
+{
+  rtems_interrupt_level level;
+  uint32_t ctrl;
+
+  rtems_interrupt_disable(level);
+  ctrl = arm_cp15_get_control();
+  ctrl |= ARM_CP15_CTRL_I;
+  arm_cp15_set_control(ctrl);
+  rtems_interrupt_enable(level);
+}
+
+static inline void _CPU_cache_disable_instruction(void)
+{
+  rtems_interrupt_level level;
+  uint32_t ctrl;
+
+  rtems_interrupt_disable(level);
+  ctrl = arm_cp15_get_control();
+  ctrl &= ~ARM_CP15_CTRL_I;
+  arm_cp15_set_control(ctrl);
+  rtems_interrupt_enable(level);
+}
+
+#endif /* LIBBSP_ARM_ARMV467AR_BASIC_CACHE_H */