Add eMMC driver support

- Fix DMA addressing issues within litex_sendsetup/litex_recvsetup
- Extend with handling specific to eMMC commands during init & use.
- Cleanup of 4-bit BUS handling for SD and eMMC
- For eMMC, Send CMD0 during init as per JEDEC v4.41 for pre-idle

Author: RadekPesina

arch/risc-v/src/litex/litex_sdio.c

@@ -860,10 +860,12 @@ static int litex_recvsetup(struct sdio_dev_s *dev, uint8_t *buffer,
 
   /* flush CPU d-cache */
 
+#ifndef CONFIG_LITEX_COHERENT_DMA
   up_invalidate_dcache_all();
+#endif
 
   putreg32(0, LITEX_SDBLOCK2MEM_DMA_ENABLE);
-  putreg32((uintptr_t)buffer >> 32, LITEX_SDBLOCK2MEM_DMA_BASE);
+  putreg32((uintptr_t)(&buffer[4]), LITEX_SDBLOCK2MEM_DMA_BASE);
   putreg32((uintptr_t)buffer, LITEX_SDBLOCK2MEM_DMA_BASE + 0x04);
   putreg32(nbytes, LITEX_SDBLOCK2MEM_DMA_LENGTH);
   putreg32(1, LITEX_SDBLOCK2MEM_DMA_ENABLE);
@@ -903,10 +905,12 @@ static int litex_sendsetup(struct sdio_dev_s *dev,
 
   /* flush CPU d-cache */
 
+#ifndef CONFIG_LITEX_COHERENT_DMA
   up_invalidate_dcache_all();
+#endif
 
   putreg32(0, LITEX_SDMEM2BLOCK_DMA_ENABLE);
-  putreg32((uintptr_t)buffer >> 32, LITEX_SDMEM2BLOCK_DMA_BASE);
+  putreg32((uintptr_t)(&buffer[4]), LITEX_SDMEM2BLOCK_DMA_BASE);
   putreg32((uintptr_t)buffer, LITEX_SDMEM2BLOCK_DMA_BASE + 0x04);
   putreg32(nbytes, LITEX_SDMEM2BLOCK_DMA_LENGTH);
   putreg32(1, LITEX_SDMEM2BLOCK_DMA_ENABLE);

boards/risc-v/litex/arty_a7/Kconfig

@@ -5,6 +5,44 @@
 
 if ARCH_BOARD_ARTY_A7
 
+
+config LITEX_SDIO
+	bool "SDIO"
+	default n
+	select SCHED_HPWORK
+	select MMCSD
+	select MMCSD_SDIO
+	select SDIO_BLOCKSETUP
+	select ARCH_HAVE_SDIO
+	select SDIO_DMA
+
+config LITEX_SDIO1
+	bool "Enable SDIO1"
+	default y if LITEX_SDIO
+	select LITEX_SDIO_DMA
+	depends on LITEX_SDIO
+
+config LITEX_IDMODE_FREQ
+	int "ID mode frequency"
+	default 400000
+	depends on LITEX_SDIO
+	---help---
+		Initial, ID mode SD frequency
+
+config LITEX_MMCXFR_FREQ
+	int "MMC transfer frequency"
+	default 25000000
+	depends on LITEX_SDIO
+	---help---
+		Frequency to use for transferring data to/from an MMC card
+
+config LITEX_SD4BIT_FREQ
+	int "SD 4-bit transfer frequency"
+	default 50000000
+	depends on LITEX_SDIO
+	---help---
+		Frequency to use for transferring data to/from an SD card using all four data lines.
+
 config LITEX_SDIO_MOUNT
 	bool "Mount SDIO at startup"
 	default n

boards/risc-v/litex/arty_a7/configs/sdmmc/defconfig

@@ -0,0 +1,75 @@
+#
+# This file is autogenerated: PLEASE DO NOT EDIT IT.
+#
+# You can use "make menuconfig" to make any modifications to the installed .config file.
+# You can then do "make savedefconfig" to generate a new defconfig file that includes your
+# modifications.
+#
+# CONFIG_DISABLE_PTHREAD is not set
+# CONFIG_FS_PROCFS_EXCLUDE_BLOCKS is not set
+# CONFIG_FS_PROCFS_EXCLUDE_ENVIRON is not set
+# CONFIG_FS_PROCFS_EXCLUDE_MEMDUMP is not set
+# CONFIG_FS_PROCFS_EXCLUDE_MEMINFO is not set
+# CONFIG_FS_PROCFS_EXCLUDE_MOUNT is not set
+# CONFIG_FS_PROCFS_EXCLUDE_MOUNTS is not set
+# CONFIG_FS_PROCFS_EXCLUDE_PROCESS is not set
+# CONFIG_FS_PROCFS_EXCLUDE_UPTIME is not set
+# CONFIG_FS_PROCFS_EXCLUDE_USAGE is not set
+# CONFIG_FS_PROCFS_EXCLUDE_VERSION is not set
+# CONFIG_NSH_DISABLEBG is not set
+# CONFIG_NSH_DISABLE_LOSMART is not set
+# CONFIG_NSH_DISABLE_UNAME is not set
+# CONFIG_STANDARD_SERIAL is not set
+CONFIG_ARCH="risc-v"
+CONFIG_ARCH_BOARD="arty_a7"
+CONFIG_ARCH_BOARD_ARTY_A7=y
+CONFIG_ARCH_CHIP="litex"
+CONFIG_ARCH_CHIP_LITEX=y
+CONFIG_ARCH_INTERRUPTSTACK=8192
+CONFIG_ARCH_RISCV=y
+CONFIG_ARCH_STACKDUMP=y
+CONFIG_BINFMT_DISABLE=y
+CONFIG_BOARD_LOOPSPERMSEC=10000
+CONFIG_BUILTIN=y
+CONFIG_DEBUG_FULLOPT=y
+CONFIG_DEBUG_SYMBOLS=y
+CONFIG_DEFAULT_SMALL=y
+CONFIG_DEV_ZERO=y
+CONFIG_EXAMPLES_HELLO=y
+CONFIG_EXAMPLES_HELLO_STACKSIZE=8192
+CONFIG_FAT_DMAMEMORY=y
+CONFIG_FAT_FORCE_INDIRECT=y
+CONFIG_FAT_LFN=y
+CONFIG_FS_FAT=y
+CONFIG_FS_FATTIME=y
+CONFIG_FS_PROCFS=y
+CONFIG_GRAN=y
+CONFIG_IDLETHREAD_STACKSIZE=8192
+CONFIG_INIT_ENTRYPOINT="nsh_main"
+CONFIG_INIT_STACKSIZE=8192
+CONFIG_INTELHEX_BINARY=y
+CONFIG_LIBC_PERROR_STDOUT=y
+CONFIG_LIBC_STRERROR=y
+CONFIG_LITEX_SDIO=y
+CONFIG_NFILE_DESCRIPTORS_PER_BLOCK=6
+CONFIG_NSH_ARCHINIT=y
+CONFIG_NSH_BUILTIN_APPS=y
+CONFIG_NSH_FILEIOSIZE=64
+CONFIG_NSH_STRERROR=y
+CONFIG_POSIX_SPAWN_DEFAULT_STACKSIZE=8192
+CONFIG_PTHREAD_STACK_DEFAULT=8192
+CONFIG_RAM_SIZE=268435456
+CONFIG_RAM_START=0x40000000
+CONFIG_RAW_BINARY=y
+CONFIG_RR_INTERVAL=200
+CONFIG_SCHED_WAITPID=y
+CONFIG_STACK_COLORATION=y
+CONFIG_START_DAY=20
+CONFIG_START_MONTH=3
+CONFIG_START_YEAR=2020
+CONFIG_SYSTEM_NSH=y
+CONFIG_TASK_NAME_SIZE=12
+CONFIG_TESTING_GETPRIME=y
+CONFIG_UART0_RXBUFSIZE=128
+CONFIG_UART0_SERIAL_CONSOLE=y
+CONFIG_UART0_TXBUFSIZE=128