cpu/sam0_common/periph: add low-level SDMMC peripheral driver for SDHC

boards/same54-xpro/Kconfig

@@ -18,6 +18,7 @@ config BOARD_SAME54_XPRO
     select HAS_PERIPH_RTC
     select HAS_PERIPH_RTT
     select HAS_PERIPH_PWM
+    select HAS_PERIPH_SDMMC
     select HAS_PERIPH_SPI
     select HAS_PERIPH_TIMER
     select HAS_PERIPH_UART
@@ -31,6 +32,7 @@ config BOARD_SAME54_XPRO
     select HAVE_SAM0_ETH
     select HAVE_SAM0_SDHC
     select HAVE_MTD_AT24CXXX
+    select HAVE_MTD_SDMMC_DEFAULT
 
     # This specific board requires SPI_ON_QSPI for the MTD_SPI_NOR
     select MODULE_PERIPH_SPI_ON_QSPI if MODULE_MTD_SPI_NOR

boards/same54-xpro/Makefile.dep

@@ -10,7 +10,11 @@ ifneq (,$(filter mtd,$(USEMODULE)))
   FEATURES_REQUIRED += periph_spi_on_qspi
   USEMODULE += mtd_spi_nor
   USEMODULE += mtd_at24cxxx at24mac
-  USEMODULE += sam0_sdhc
+  ifeq (,$(filter sam0_sdhc,$(USEMODULE)))
+    # during a transition period it is possible to use the `sam0_sdhc` MTD
+    # driver instead of the SD/MMC MTD driver
+    USEMODULE += mtd_sdmmc_default
+  endif
 endif
 
 # enables sam0_eth as default network device

boards/same54-xpro/Makefile.features

@@ -8,6 +8,7 @@ FEATURES_PROVIDED += periph_i2c
 FEATURES_PROVIDED += periph_rtc
 FEATURES_PROVIDED += periph_rtt
 FEATURES_PROVIDED += periph_pwm
+FEATURES_PROVIDED += periph_sdmmc
 FEATURES_PROVIDED += periph_spi
 FEATURES_PROVIDED += periph_timer
 FEATURES_PROVIDED += periph_uart

boards/same54-xpro/include/board.h

@@ -76,6 +76,8 @@ extern mtd_dev_t *mtd0, *mtd1, *mtd2;
 #define MTD_1       mtd1
 #define MTD_2       mtd2
 #define MTD_NUMOF   3
+
+#define CONFIG_SDMMC_GENERIC_MTD_OFFSET     2   /**< mtd2 is used for SD Card */
 /** @} */
 
 /**

boards/same54-xpro/include/periph_conf.h

@@ -369,6 +369,18 @@ static const adc_conf_chan_t adc_channels[] = {
  */
 #define SDHC_DEV            SDHC1       /**< The SDHC instance to use */
 #define SDHC_DEV_ISR        isr_sdhc1   /**< Interrupt service routing for SDHC1 */
+
+/** SDHC devices */
+static const sdhc_conf_t sdhc_config[] = {
+    {
+        .sdhc = SDHC1,
+        .cd = GPIO_PIN(PD, 20),
+        .wp = GPIO_UNDEF,
+    },
+};
+
+/** Number of configured SDHC devices */
+#define SDHC_CONFIG_NUMOF  1
 /** @} */
 
 /**

cpu/sam0_common/Kconfig

@@ -17,6 +17,10 @@ config CPU_COMMON_SAM0
     select HAS_PERIPH_I2C_RECONFIGURE
     select HAS_PERIPH_RTT_SET_COUNTER
     select HAS_PERIPH_RTT_OVERFLOW
+    select HAS_PERIPH_SDMMC_AUTO_CMD12
+    select HAS_PERIPH_SDMMC_HS
+    select HAS_PERIPH_SDMMC_MMC
+    select HAS_PERIPH_SDMMC_SDHC
     select HAS_PERIPH_SPI_RECONFIGURE
     select HAS_PERIPH_SPI_GPIO_MODE
     select HAS_PERIPH_TIMER_PERIODIC

cpu/sam0_common/Makefile.dep

@@ -10,6 +10,10 @@ ifneq (,$(filter periph_spi,$(USEMODULE)))
   USEMODULE += periph_spi_gpio_mode
 endif
 
+ifneq (,$(filter periph_sdmmc,$(USEMODULE)))
+  USEMODULE += sdmmc_sdhc
+endif
+
 # include sam0 common periph drivers
 USEMODULE += sam0_common_periph
 

cpu/sam0_common/Makefile.features

@@ -15,6 +15,10 @@ FEATURES_PROVIDED += periph_gpio periph_gpio_irq
 FEATURES_PROVIDED += periph_i2c_reconfigure
 FEATURES_PROVIDED += periph_rtt_set_counter
 FEATURES_PROVIDED += periph_rtt_overflow
+FEATURES_PROVIDED += periph_sdmmc_auto_cmd12
+FEATURES_PROVIDED += periph_sdmmc_hs
+FEATURES_PROVIDED += periph_sdmmc_mmc
+FEATURES_PROVIDED += periph_sdmmc_sdhc
 FEATURES_PROVIDED += periph_spi_reconfigure
 FEATURES_PROVIDED += periph_spi_gpio_mode
 FEATURES_PROVIDED += periph_timer_periodic # implements timer_set_periodic()

cpu/sam0_common/include/periph_cpu_common.h

@@ -907,6 +907,25 @@ typedef struct {
 } sam0_common_usb_config_t;
 #endif /* USB_INST_NUM */
 
+/**
+ * @brief SDIO/SDMMC buffer alignment for SDHC because of DMA/FIFO buffer restrictions
+ */
+#define SDMMC_CPU_DMA_ALIGNMENT     4
+
+/**
+ * @brief SDIO/SDMMC buffer instantiation requirement for SDHC
+ */
+#define SDMMC_CPU_DMA_REQUIREMENTS  __attribute__((aligned(SDMMC_CPU_DMA_ALIGNMENT)))
+
+/**
+ * @brief SDHC peripheral configuration
+ */
+typedef struct {
+    void *sdhc; /**< SDHC peripheral */
+    gpio_t cd;  /**< Card Detect pin (must be GPIO_UNDEF if not connected) */
+    gpio_t wp;  /**< Write Protect pin (must be GPIO_UNDEF if not connected) */
+} sdhc_conf_t;
+
 /**
  * @name    WDT upper and lower bound times in ms
  * @{

cpu/sam0_common/include/sdhc.h

@@ -11,6 +11,9 @@
  * @ingroup     cpu_sam0_common
  * @brief       SD card interface functions for sam0 class devices
  *
+ * @warning     This driver is deprecated. Use the `sdmmc` driver module
+ *              instead. You can refer to the `same54-xpro´ board as an example
+ *              on how to use it.
  * @{
  *
  * @file

cpu/samd5x/include/periph_cpu.h

@@ -54,6 +54,16 @@ extern "C" {
  * @{
  */
 #define PM_NUM_MODES            (4)     /**< Backup, Hibernate, Standby, Idle */
+
+/**
+ * @brief   Power modes
+ */
+enum {
+    SAM0_PM_BACKUP = 0,
+    SAM0_PM_HIBERNATE = 1,
+    SAM0_PM_STANDBY = 2,
+    SAM0_PM_IDLE = 3,
+};
 /** @} */
 
 /**