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new c92c4af xtensa/esp32s2: Initialize instruction cache on startup
c92c4af is described below
commit c92c4af304dcc09254dc4023ca822fef11d98233
Author: Gustavo Henrique Nihei <[email protected]>
AuthorDate: Wed Mar 23 17:07:23 2022 -0300
xtensa/esp32s2: Initialize instruction cache on startup
Signed-off-by: Gustavo Henrique Nihei <[email protected]>
---
arch/xtensa/src/esp32s2/esp32s2_start.c | 109 +++++++++++++++++----
.../xtensa/esp32s2/esp32s2-saola-1/include/board.h | 14 ++-
.../esp32s2/esp32s2-saola-1/scripts/esp32s2_rom.ld | 4 +-
3 files changed, 103 insertions(+), 24 deletions(-)
diff --git a/arch/xtensa/src/esp32s2/esp32s2_start.c
b/arch/xtensa/src/esp32s2/esp32s2_start.c
index 18dfe34..addf53a 100644
--- a/arch/xtensa/src/esp32s2/esp32s2_start.c
+++ b/arch/xtensa/src/esp32s2/esp32s2_start.c
@@ -82,20 +82,55 @@ extern uint32_t _image_drom_lma;
extern uint32_t _image_drom_size;
#endif
+typedef enum
+{
+ CACHE_MEMORY_INVALID = 0,
+ CACHE_MEMORY_ICACHE_LOW = 1 << 0,
+ CACHE_MEMORY_ICACHE_HIGH = 1 << 1,
+ CACHE_MEMORY_DCACHE_LOW = 1 << 2,
+ CACHE_MEMORY_DCACHE_HIGH = 1 << 3,
+} cache_layout_t;
+
+typedef enum
+{
+ CACHE_SIZE_HALF = 0, /* 8KB for icache and dcache */
+ CACHE_SIZE_FULL = 1, /* 16KB for icache and dcache */
+} cache_size_t;
+
+typedef enum
+{
+ CACHE_4WAYS_ASSOC = 0, /* 4 way associated cache */
+ CACHE_8WAYS_ASSOC = 1, /* 8 way associated cache */
+} cache_ways_t;
+
+typedef enum
+{
+ CACHE_LINE_SIZE_16B = 0, /* 16 Byte cache line size */
+ CACHE_LINE_SIZE_32B = 1, /* 32 Byte cache line size */
+ CACHE_LINE_SIZE_64B = 2, /* 64 Byte cache line size */
+} cache_line_size_t;
+
/****************************************************************************
* ROM Function Prototypes
****************************************************************************/
#ifdef CONFIG_ESP32S2_APP_FORMAT_MCUBOOT
extern int ets_printf(const char *fmt, ...);
-extern uint32_t cache_suspend_icache(void);
-extern void cache_resume_icache(uint32_t val);
-extern void cache_invalidate_icache_all(void);
extern int cache_ibus_mmu_set(uint32_t ext_ram, uint32_t vaddr,
uint32_t paddr, uint32_t psize, uint32_t num,
uint32_t fixed);
#endif
+extern uint32_t cache_suspend_icache(void);
+extern void cache_resume_icache(uint32_t val);
+extern void cache_invalidate_icache_all(void);
+extern void cache_set_icache_mode(cache_size_t cache_size, cache_ways_t ways,
+ cache_line_size_t cache_line_size);
+extern void cache_allocate_sram(cache_layout_t sram0_layout,
+ cache_layout_t sram1_layout,
+ cache_layout_t sram2_layout,
+ cache_layout_t sram3_layout);
+
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
@@ -126,6 +161,54 @@ uint32_t g_idlestack[IDLETHREAD_STACKWORDS]
****************************************************************************/
/****************************************************************************
+ * Name: configure_cpu_caches
+ *
+ * Description:
+ * Configure the Instruction and Data CPU caches.
+ *
+ * Input Parameters:
+ * None.
+ *
+ * Returned Value:
+ * None.
+ *
+ ****************************************************************************/
+
+static void IRAM_ATTR configure_cpu_caches(void)
+{
+ cache_size_t cache_size;
+ cache_ways_t cache_ways;
+ cache_line_size_t cache_line_size;
+
+ /* Configure the mode of instruction cache: cache size, cache associated
+ * ways, cache line size.
+ */
+
+#ifdef CONFIG_ESP32S2_INSTRUCTION_CACHE_8KB
+ cache_allocate_sram(CACHE_MEMORY_ICACHE_LOW, CACHE_MEMORY_INVALID,
+ CACHE_MEMORY_INVALID, CACHE_MEMORY_INVALID);
+ cache_size = CACHE_SIZE_HALF;
+#else
+ cache_allocate_sram(CACHE_MEMORY_ICACHE_LOW, CACHE_MEMORY_ICACHE_HIGH,
+ CACHE_MEMORY_INVALID, CACHE_MEMORY_INVALID);
+ cache_size = CACHE_SIZE_FULL;
+#endif
+
+ cache_ways = CACHE_4WAYS_ASSOC;
+
+#ifdef CONFIG_ESP32S2_INSTRUCTION_CACHE_LINE_16B
+ cache_line_size = CACHE_LINE_SIZE_16B;
+#else
+ cache_line_size = CACHE_LINE_SIZE_32B;
+#endif
+
+ cache_suspend_icache();
+ cache_set_icache_mode(cache_size, cache_ways, cache_line_size);
+ cache_invalidate_icache_all();
+ cache_resume_icache(0);
+}
+
+/****************************************************************************
* Name: __esp32s2_start
*
* Description:
@@ -139,15 +222,10 @@ uint32_t g_idlestack[IDLETHREAD_STACKWORDS]
*
****************************************************************************/
-void IRAM_ATTR __esp32s2_start(void)
+static void noreturn_function IRAM_ATTR __esp32s2_start(void)
{
- uint32_t regval;
uint32_t sp;
- regval = getreg32(DR_REG_BB_BASE + 0x48); /* DR_REG_BB_BASE+48 */
- regval &= ~(1 << 14);
- putreg32(regval, DR_REG_BB_BASE + 0x48);
-
/* Make sure that normal interrupts are disabled. This is really only an
* issue when we are started in un-usual ways (such as from IRAM). In this
* case, we can at least defer some unexpected interrupts left over from
@@ -173,8 +251,6 @@ void IRAM_ATTR __esp32s2_start(void)
__asm__ __volatile__ ("wsr %0, vecbase\n"::"r" (&_init_start));
- /* Set .bss to zero */
-
/* Clear .bss. We'll do this inline (vs. calling memset) just to be
* certain that there are no issues with the state of global variables.
*/
@@ -335,15 +411,11 @@ static int map_rom_segments(void)
*
* Description:
* We arrive here after the bootloader finished loading the program from
- * flash. The hardware is mostly uninitialized, and the app CPU is in
- * reset. We do have a stack, so we can do the initialization in C.
- *
- * The app CPU will remain in reset unless CONFIG_SMP is selected and
- * up_cpu_start() is called later in the bring-up sequence.
+ * flash. We do have a stack, so we can do the initialization in C.
*
****************************************************************************/
-void __start(void)
+void IRAM_ATTR __start(void)
{
#ifdef CONFIG_ESP32S2_APP_FORMAT_MCUBOOT
if (map_rom_segments() != 0)
@@ -353,6 +425,9 @@ void __start(void)
}
#endif
+
+ configure_cpu_caches();
+
__esp32s2_start();
while (true); /* Should not return */
diff --git a/boards/xtensa/esp32s2/esp32s2-saola-1/include/board.h
b/boards/xtensa/esp32s2/esp32s2-saola-1/include/board.h
index 0d462d9..ae4fcec 100644
--- a/boards/xtensa/esp32s2/esp32s2-saola-1/include/board.h
+++ b/boards/xtensa/esp32s2/esp32s2-saola-1/include/board.h
@@ -22,12 +22,18 @@
#define __BOARDS_XTENSA_ESP32S2_ESP32S2_SAOLA_1_INCLUDE_BOARD_H
/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Clocking *****************************************************************/
-/* The ESP32S2 board V2 is fitted with a 40MHz crystal */
+/* The ESP32-S2-Saola-1 is fitted with a 40MHz crystal */
#define BOARD_XTAL_FREQUENCY 40000000
@@ -47,13 +53,11 @@
/* Note: The bootloader (esp-idf bootloader.bin) configures:
*
* - CPU frequency to 80MHz
- * - The XTAL frequency according to the SDK config CONFIG_ESP32S2_XTAL_FREQ,
- * which is 40MHz by default.
*
* Reference:
* https://github.com/espressif/esp-idf/blob
- * /6fd855ab8d00d23bad4660216bc2122c2285d5be/components
- * /bootloader_support/src/bootloader_clock.c#L38-L62
+ * /ebf7e811b12e3c1e347340e5b9ec014e9c6319ba/components
+ * /bootloader_support/src/bootloader_clock_init.c#L26-L27
*/
#ifdef CONFIG_ESP32S2_RUN_IRAM
diff --git a/boards/xtensa/esp32s2/esp32s2-saola-1/scripts/esp32s2_rom.ld
b/boards/xtensa/esp32s2/esp32s2-saola-1/scripts/esp32s2_rom.ld
index 3290eb3..ec17e1d 100644
--- a/boards/xtensa/esp32s2/esp32s2-saola-1/scripts/esp32s2_rom.ld
+++ b/boards/xtensa/esp32s2/esp32s2-saola-1/scripts/esp32s2_rom.ld
@@ -11,7 +11,7 @@ PROVIDE ( acm_usb_descriptors = 0x3ffaee68 );
PROVIDE ( boot_prepare = 0x4000f348 );
PROVIDE ( Cache_Address_Through_DCache = 0x400180f0 );
PROVIDE ( Cache_Address_Through_ICache = 0x400180bc );
-PROVIDE ( Cache_Allocate_SRAM = 0x40018d6c );
+PROVIDE ( cache_allocate_sram = 0x40018d6c );
PROVIDE ( Cache_Clean_Addr = 0x40018370 );
PROVIDE ( Cache_Clean_All = 0x40018438 );
PROVIDE ( Cache_Clean_Items = 0x40018250 );
@@ -62,7 +62,7 @@ PROVIDE ( cache_resume_icache = 0x40018cdc );
PROVIDE ( Cache_Resume_ICache_Autoload = 0x400184c4 );
PROVIDE ( Cache_Set_DCache_Mode = 0x40018074 );
PROVIDE ( Cache_Set_Default_Mode = 0x4001810c );
-PROVIDE ( Cache_Set_ICache_Mode = 0x4001803c );
+PROVIDE ( cache_set_icache_mode = 0x4001803c );
PROVIDE ( Cache_Start_DCache_Preload = 0x400185c4 );
PROVIDE ( Cache_Start_ICache_Preload = 0x40018530 );
PROVIDE ( Cache_Suspend_DCache = 0x40018d04 );
