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mmc: sdhci: add Black Sesame Technologies BST C1200 controller driver

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Add SDHCI controller driver for Black Sesame Technologies C1200 SoC.

This driver supports the DWCMSHC SDHCI controller with BST-specific
enhancements including:
- Custom clock management and tuning
- Power management support
- BST-specific register configurations
- Support for eMMC and SD card interfaces
- Hardware limitation workaround for 32-bit DMA addressing

The driver addresses specific hardware constraints where:
- System memory uses 64-bit bus, eMMC controller uses 32-bit bus
- eMMC controller cannot access memory through SMMU due to hardware bug
- All system DRAM is configured outside 4GB boundary (ZONE_DMA32)
- Uses SRAM-based bounce buffer within 32-bit address space

Signed-off-by: Ge Gordon <gordon.ge@bst.ai>
Signed-off-by: Albert Yang <yangzh0906@thundersoft.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Albert Yang
2026-02-23 12:06:55 +01:00
committed by Ulf Hansson
parent ef7eb1a709
commit 695824f456
3 changed files with 536 additions and 0 deletions
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drivers/mmc/host/Kconfig
+14
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@@ -429,6 +429,20 @@ config MMC_SDHCI_BCM_KONA
If you have a controller with this interface, say Y or M here.
config MMC_SDHCI_BST
tristate "SDHCI support for Black Sesame Technologies BST C1200 controller"
depends on ARCH_BST || COMPILE_TEST
depends on MMC_SDHCI_PLTFM
depends on OF
help
This selects the Secure Digital Host Controller Interface (SDHCI)
for Black Sesame Technologies BST C1200 SoC. The controller is
based on Synopsys DesignWare Cores Mobile Storage Controller but
requires platform-specific workarounds for hardware limitations.
If you have a controller with this interface, say Y or M here.
If unsure, say N.
config MMC_SDHCI_F_SDH30
tristate "SDHCI support for Fujitsu Semiconductor F_SDH30"
depends on MMC_SDHCI_PLTFM
drivers/mmc/host/Makefile
+1
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@@ -13,6 +13,7 @@ obj-$(CONFIG_MMC_MXS) += mxs-mmc.o
obj-$(CONFIG_MMC_SDHCI) += sdhci.o
obj-$(CONFIG_MMC_SDHCI_UHS2) += sdhci-uhs2.o
obj-$(CONFIG_MMC_SDHCI_PCI) += sdhci-pci.o
obj-$(CONFIG_MMC_SDHCI_BST) += sdhci-of-bst.o
sdhci-pci-y += sdhci-pci-core.o sdhci-pci-o2micro.o sdhci-pci-arasan.o \
sdhci-pci-dwc-mshc.o sdhci-pci-gli.o
obj-$(CONFIG_MMC_SDHCI_ACPI) += sdhci-acpi.o
drivers/mmc/host/sdhci-of-bst.c
+521
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