soc: nxp_mxrt7xx: Fix cache implementation for CPU0

This SoC has an external XCACHE controller for CPU0
instruction and data bus.
Add code to enable the data cache. Instruction cache
is already enabled by SystemInit.

Signed-off-by: Mahesh Mahadevan <mahesh.mahadevan@nxp.com>

Author: mmahadevan108

boards/nxp/mimxrt700_evk/board.c

@@ -79,10 +79,6 @@ void board_early_init_hook(void)
 		.coarseTrimEn = true,
 	};
 
-#ifndef CONFIG_IMXRT7XX_CODE_CACHE
-	CACHE64_DisableCache(CACHE64_CTRL0);
-#endif
-
 	POWER_DisablePD(kPDRUNCFG_PD_LPOSC);
 
 	/* Power up OSC */

soc/nxp/imxrt/imxrt7xx/Kconfig

@@ -14,8 +14,13 @@ config SOC_MIMXRT798S_CM33_CPU0
 	select CPU_CORTEX_M_HAS_SYSTICK
 	select HAS_MCUX
 	select HAS_MCUX_SYSCON
-	select HAS_MCUX_CACHE
+	select HAS_MCUX_XCACHE
+	select CACHE_MANAGEMENT
+	select CPU_HAS_ICACHE
+	select CPU_HAS_DCACHE
+	select INIT_ARCH_HW_AT_BOOT
 	select SOC_RESET_HOOK
+	select SOC_EARLY_INIT_HOOK
 	select HAS_MCUX_FLEXCOMM
 
 config SOC_MIMXRT798S_CM33_CPU1
@@ -46,13 +51,6 @@ config GLIKEY_MCUX_GLIKEY
 	default y
 	bool "Use glikey MCUX Driver"
 
-config IMXRT7XX_CODE_CACHE
-	bool "Code cache"
-	default y if HAS_MCUX_CACHE
-	help
-	  Enable code cache for XSPI region at boot. If this Kconfig is
-	  cleared, the CACHE64 controller will be disabled during SOC init
-
 config MCUX_CORE_SUFFIX
 	default "_cm33_core0" if SOC_MIMXRT798S_CM33_CPU0
 	default "_cm33_core1" if SOC_MIMXRT798S_CM33_CPU1

soc/nxp/imxrt/imxrt7xx/Kconfig.defconfig

@@ -12,6 +12,10 @@ config NUM_IRQS
 config SYS_CLOCK_HW_CYCLES_PER_SEC
 	default 237500000 if CORTEX_M_SYSTICK
 
+choice CACHE_TYPE
+	default EXTERNAL_CACHE
+endchoice
+
 endif # SOC_MIMXRT798S_CM33_CPU0
 
 if SOC_MIMXRT798S_CM33_CPU1

soc/nxp/imxrt/imxrt7xx/cm33/soc.c

@@ -15,8 +15,18 @@
 #include <zephyr/init.h>
 #include <zephyr/devicetree.h>
 #include <zephyr/linker/sections.h>
+#include <zephyr/cache.h>
 #include <soc.h>
 
+void soc_early_init_hook(void)
+{
+	/* Enable data cache */
+	sys_cache_data_enable();
+
+	__ISB();
+	__DSB();
+}
+
 #ifdef CONFIG_SOC_RESET_HOOK
 
 void soc_reset_hook(void)

soc/nxp/imxrt/imxrt7xx/cm33/soc.h

@@ -20,6 +20,12 @@
 #include <zephyr/sys/util.h>
 #include <fsl_common.h>
 
+/* CPU 0 has an instruction and data cache, provide the defines for XCACHE */
+#ifdef CONFIG_SOC_MIMXRT798S_CM33_CPU0
+#define NXP_XCACHE_INSTR XCACHE1
+#define NXP_XCACHE_DATA XCACHE0
+#endif
+
 #ifdef __cplusplus
 extern "C" {
 #endif