stm32/mpu: Reduce flash use with non-inline mpu_config_region.

Andrew Leech · Andrew Leech · commit 3033161a7349 · 2024-04-05T11:18:18.000+11:00
Signed-off-by: Andrew Leech &lt;andrew.leech@planetinnovation.com.au&gt;
diff --git a/ports/stm32/Makefile b/ports/stm32/Makefile
@@ -278,6 +278,7 @@ SRC_C += \
 	adc.c \
 	sdio.c \
 	subghz.c \
+	mpu.c \
 	$(wildcard $(BOARD_DIR)/*.c)
 
 SRC_O += \
diff --git a/ports/stm32/mpu.c b/ports/stm32/mpu.c
@@ -0,0 +1,73 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Damien P. George
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <stdint.h>
+#include "py/mphal.h"
+#include "mpu.h"
+
+#if (defined(STM32F4) && defined(MICROPY_HW_ETH_MDC)) || defined(STM32F7) || defined(STM32H7) || defined(STM32WB)
+
+void mpu_config_region(uint32_t region, uint32_t base_addr, uint32_t attr_size) {
+    MPU->RNR = region;
+    MPU->RBAR = base_addr;
+    MPU->RASR = attr_size;
+}
+
+#elif defined(STM32H5)
+
+void mpu_config_region(uint32_t region, uint32_t base_addr, uint32_t size) {
+    if (region == MPU_REGION_ETH) {
+        // Configure region 1 to make DMA memory non-cacheable.
+
+        __DMB();
+        // Configure attribute 1, inner-outer non-cacheable (=0x44).
+        MPU->MAIR0 = (MPU->MAIR0 & ~MPU_MAIR0_Attr1_Msk)
+            | 0x44 << MPU_MAIR0_Attr1_Pos;
+        __DMB();
+
+        // RBAR
+        //  BASE          Bits [31:5] of base address
+        //  SH[4:3]  00 = Non-shareable
+        //  AP[2:1]  01 = Read/write by any privilege level
+        //  XN[0]:    1 = No execution
+
+        // RLAR
+        //  LIMIT         Limit address. Contains bits[31:5] of the upper inclusive limit of the selected MPU memory region
+        //  AT[3:1] 001 = Attribute 1
+        //  EN[0]     1 = Enabled
+        MPU->RNR = region;
+        MPU->RBAR = (base_addr & MPU_RBAR_BASE_Msk)
+            | MPU_ACCESS_NOT_SHAREABLE << MPU_RBAR_SH_Pos
+            | MPU_REGION_ALL_RW << MPU_RBAR_AP_Pos
+            | MPU_INSTRUCTION_ACCESS_DISABLE << MPU_RBAR_XN_Pos;
+        MPU->RLAR = ((base_addr + size - 1) & MPU_RLAR_LIMIT_Msk)
+            | MPU_ATTRIBUTES_NUMBER1 << MPU_RLAR_AttrIndx_Pos
+            | MPU_REGION_ENABLE << MPU_RLAR_EN_Pos;
+    }
+    __DMB();
+}
+
+#endif
diff --git a/ports/stm32/mpu.h b/ports/stm32/mpu.h
@@ -118,11 +118,7 @@ static inline uint32_t mpu_config_start(void) {
     return disable_irq();
 }
 
-static inline void mpu_config_region(uint32_t region, uint32_t base_addr, uint32_t attr_size) {
-    MPU->RNR = region;
-    MPU->RBAR = base_addr;
-    MPU->RASR = attr_size;
-}
+MP_NOINLINE void mpu_config_region(uint32_t region, uint32_t base_addr, uint32_t attr_size);
 
 static inline void mpu_config_end(uint32_t irq_state) {
     __ISB();
@@ -172,44 +168,15 @@ static inline uint32_t mpu_config_start(void) {
     return disable_irq();
 }
 
-static inline void mpu_config_region(uint32_t region, uint32_t base_addr, uint32_t size) {
-    if (region == MPU_REGION_ETH) {
-        // Configure region 1 to make DMA memory non-cacheable.
+MP_NOINLINE void mpu_config_region(uint32_t region, uint32_t base_addr, uint32_t attr_size);
+if (region == MPU_REGION_ETH) {
 
+    static inline void mpu_config_end(uint32_t irq_state) {
+        __ISB();
+        __DSB();
         __DMB();
-        // Configure attribute 1, inner-outer non-cacheable (=0x44).
-        MPU->MAIR0 = (MPU->MAIR0 & ~MPU_MAIR0_Attr1_Msk)
-            | 0x44 << MPU_MAIR0_Attr1_Pos;
-        __DMB();
-
-        // RBAR
-        //  BASE          Bits [31:5] of base address
-        //  SH[4:3]  00 = Non-shareable
-        //  AP[2:1]  01 = Read/write by any privilege level
-        //  XN[0]:    1 = No execution
-
-        // RLAR
-        //  LIMIT         Limit address. Contains bits[31:5] of the upper inclusive limit of the selected MPU memory region
-        //  AT[3:1] 001 = Attribute 1
-        //  EN[0]     1 = Enabled
-        MPU->RNR = region;
-        MPU->RBAR = (base_addr & MPU_RBAR_BASE_Msk)
-            | MPU_ACCESS_NOT_SHAREABLE << MPU_RBAR_SH_Pos
-            | MPU_REGION_ALL_RW << MPU_RBAR_AP_Pos
-            | MPU_INSTRUCTION_ACCESS_DISABLE << MPU_RBAR_XN_Pos;
-        MPU->RLAR = ((base_addr + size - 1) & MPU_RLAR_LIMIT_Msk)
-            | MPU_ATTRIBUTES_NUMBER1 << MPU_RLAR_AttrIndx_Pos
-            | MPU_REGION_ENABLE << MPU_RLAR_EN_Pos;
+        enable_irq(irq_state);
     }
-    __DMB();
-}
-
-static inline void mpu_config_end(uint32_t irq_state) {
-    __ISB();
-    __DSB();
-    __DMB();
-    enable_irq(irq_state);
-}
 
 #else
 
