new file mode 100644
@@ -0,0 +1,95 @@
+/** @file
+ Protocol to describe overrides required to support non-standard SDHCI
+ implementations
+
+ Copyright (c) 2017, Linaro, Ltd. All rights reserved.<BR>
+
+ This program and the accompanying materials
+ are licensed and made available under the terms and conditions of the BSD License
+ which accompanies this distribution. The full text of the license may be found at
+ http://opensource.org/licenses/bsd-license.php
+
+ THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#ifndef __SD_MMC_OVERRIDE_H__
+#define __SD_MMC_OVERRIDE_H__
+
+#define EDKII_SD_MMC_OVERRIDE_PROTOCOL_GUID \
+ { 0xeaf9e3c1, 0xc9cd, 0x46db, { 0xa5, 0xe5, 0x5a, 0x12, 0x4c, 0x83, 0x23, 0x23 } }
+
+#define EDKII_SD_MMC_OVERRIDE_PROTOCOL_VERSION 0x1
+
+typedef struct _SD_MMC_OVERRIDE SD_MMC_OVERRIDE;
+
+typedef enum {
+ SD_MMC_OVERRIDE_RESET_PRE_HOOK,
+ SD_MMC_OVERRIDE_RESET_POST_HOOK,
+ SD_MMC_OVERRIDE_INIT_HOST_PRE_HOOK,
+ SD_MMC_OVERRIDE_INIT_HOST_POST_HOOK,
+} SD_MMC_OVERRIDE_HOOK;
+
+/**
+
+ Override function for SDHCI capability bits
+
+ @param[in] ControllerHandle The EFI_HANDLE of the controller.
+ @param[in] Slot The 0 based slot index.
+ @param[in,out] SdMmcHcSlotCapability The SDHCI capability structure.
+
+ @retval EFI_SUCCESS The override function completed successfully.
+ @retval EFI_NOT_FOUND The specified controller or slot does not exist.
+ @retval EFI_INVALID_PARAMETER SdMmcHcSlotCapability is NULL
+
+**/
+typedef
+EFI_STATUS
+(EFIAPI * SD_MMC_OVERRIDE_CAPABILITY) (
+ IN EFI_HANDLE ControllerHandle,
+ IN UINT8 Slot,
+ IN OUT VOID *SdMmcHcSlotCapability
+ );
+
+/**
+
+ Override function for SDHCI controller operations
+
+ @param[in] ControllerHandle The EFI_HANDLE of the controller.
+ @param[in] Slot The 0 based slot index.
+ @param[in,out] HookType The type of operation and whether the
+ hook is invoked right before (pre) or
+ right after (post)
+
+ @retval EFI_SUCCESS The override function completed successfully.
+ @retval EFI_NOT_FOUND The specified controller or slot does not exist.
+ @retval EFI_INVALID_PARAMETER HookType is invalid
+
+**/
+typedef
+EFI_STATUS
+(EFIAPI * SD_MMC_OVERRIDE_INVOKE_HOOK) (
+ IN EFI_HANDLE ControllerHandle,
+ IN UINT8 Slot,
+ IN SD_MMC_OVERRIDE_HOOK HookType
+ );
+
+struct _SD_MMC_OVERRIDE {
+ //
+ // Protocol version of this implementation
+ //
+ UINTN Version;
+ //
+ // Callback to override SD/MMC host controller capability bits
+ //
+ SD_MMC_OVERRIDE_CAPABILITY OverrideCapability;
+ //
+ // Callback to invoke SD/MMC override hooks
+ //
+ SD_MMC_OVERRIDE_INVOKE_HOOK InvokeHook;
+};
+
+extern EFI_GUID gEdkiiSdMmcOverrideProtocolGuid;
+
+#endif
@@ -559,6 +559,9 @@ [Protocols]
## Include/Protocol/SmmEndofS3Resume.h
gEdkiiSmmEndOfS3ResumeProtocolGuid = { 0x96f5296d, 0x05f7, 0x4f3c, {0x84, 0x67, 0xe4, 0x56, 0x89, 0x0e, 0x0c, 0xb5 } }
+ ## Include/Protocol/SdMmcOverride.h
+ gEdkiiSdMmcOverrideProtocolGuid = { 0xeaf9e3c1, 0xc9cd, 0x46db, { 0xa5, 0xe5, 0x5a, 0x12, 0x4c, 0x83, 0x23, 0x23 } }
+
#
# [Error.gEfiMdeModulePkgTokenSpaceGuid]
# 0x80000001 | Invalid value provided.
Many ARM based SoCs have integrated SDHCI controllers, and often, these implementations deviate in subtle ways from the pertinent specifications. On the one hand, these deviations are quite easy to work around, but on the other hand, having a collection of SoC specific workarounds in the generic driver stack is undesirable. So let's introduce an optional SD/MMC override protocol that we can invoke at the appropriate moments in the device initialization. That way, the workaround itself remains platform specific, but we can still use the generic driver stack on such platforms. Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> --- MdeModulePkg/Include/Protocol/SdMmcOverride.h | 95 ++++++++++++++++++++ MdeModulePkg/MdeModulePkg.dec | 3 + 2 files changed, 98 insertions(+) -- 2.11.0 _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel