drivers/flash: stm32: Add qspi-nor flash-controller

Add support for DMA based STM32 QSPI NOR flash controller.
Driver configures both NOR flash and also QSPI hardware block.
Reuses existing jesd216 library.

QSPI hardware block handling is done through the use of Cube HAL API.
This requires the use of HAL interface also for DMA besides zephyr
DMA driver.
Zephyr DMA driver is used only for IRQ routing while HAL driver
handles the IP block. To achieve this it is required to:
-Configure both Cube and Zephyr drivers at init.
-Inform Zephyr driver that current channel handling will be done
by another instance and only a limited configuration should be done.
For this last part, a unused parameter is overridden in order to
transmit the information.

Signed-off-by: Erwan Gouriou <[email protected]>
Signed-off-by: Piotr Mienkowski <[email protected]>

Author: erwango

drivers/dma/dma_stm32.c

@@ -252,6 +252,18 @@ DMA_STM32_EXPORT_API int dma_stm32_configure(const struct device *dev,
 	/* give channel from index 0 */
 	id = id - STREAM_OFFSET;
 
+	/* Check potential DMA override */
+	if (config->linked_channel == 0x7F) {
+		/* DMA channel is overridden by HAL DMA
+		 * Retain that the channel is busy and proceed to the minimal
+		 * configuration to properly route the IRQ
+		 */
+		stream->busy = true;
+		stream->dma_callback = config->dma_callback;
+		stream->user_data = config->user_data;
+		return 0;
+	}
+
 	if (id >= dev_config->max_streams) {
 		LOG_ERR("cannot configure the dma stream %d.", id);
 		return -EINVAL;

drivers/flash/CMakeLists.txt

@@ -16,6 +16,7 @@ zephyr_library_sources_ifdef(CONFIG_SOC_FLASH_SAM flash_sam.c)
 zephyr_library_sources_ifdef(CONFIG_SOC_FLASH_NIOS2_QSPI soc_flash_nios2_qspi.c)
 zephyr_library_sources_ifdef(CONFIG_SOC_FLASH_GECKO flash_gecko.c)
 zephyr_library_sources_ifdef(CONFIG_SOC_FLASH_RV32M1 soc_flash_rv32m1.c)
+zephyr_library_sources_ifdef(CONFIG_FLASH_STM32_QSPI flash_stm32_qspi.c)
 
 if(CONFIG_SOC_FLASH_STM32)
   if(CONFIG_SOC_SERIES_STM32H7X)

drivers/flash/Kconfig

@@ -72,6 +72,8 @@ source "drivers/flash/Kconfig.nor"
 
 source "drivers/flash/Kconfig.stm32"
 
+source "drivers/flash/Kconfig.stm32_qspi"
+
 source "drivers/flash/Kconfig.sam0"
 
 source "drivers/flash/Kconfig.sam"

drivers/flash/Kconfig.stm32_qspi

@@ -0,0 +1,21 @@
+# STM32 Quad SPI flash driver configuration options
+
+# Copyright (c) 2020 Piotr Mienkowski
+# Copyright (c) 2020 Linaro Limited
+# SPDX-License-Identifier: Apache-2.0
+
+DT_COMPAT_ST_STM32_QSPI_NOR := st,stm32-qspi-nor
+
+config FLASH_STM32_QSPI
+	bool "STM32 Quad SPI Flash driver"
+	depends on SOC_FAMILY_STM32
+	default $(dt_compat_enabled,$(DT_COMPAT_ST_STM32_QSPI_NOR))
+	select USE_STM32_HAL_QSPI
+	select USE_STM32_HAL_DMA
+	select DMA
+	select FLASH_HAS_DRIVER_ENABLED
+	select FLASH_JESD216
+	select FLASH_PAGE_LAYOUT
+	select FLASH_HAS_PAGE_LAYOUT
+	help
+	  Enable QSPI-NOR support on the STM32 family of processors.