522c141d53
- Switch to 25MHz clock - Switch to 4bit transfers mode (the default is 1bit) Reading and writing SD cards do not seem to work anymore with these changes. I get invalid data on read, and on write, an interrupt is never called in some cases.
109 lines
3.1 KiB
C
109 lines
3.1 KiB
C
/*
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* Copyright 2019-2020, Haiku, Inc. All Rights Reserved.
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* Distributed under the terms of the MIT License.
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*
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* Authors:
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* Adrien Destugues, pulkomandy@pulkomandy.tk
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*/
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#ifndef _MMC_H
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#define _MMC_H
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#include <device_manager.h>
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#define MMC_BUS_MODULE_NAME "bus_managers/mmc/driver_v1"
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struct IOOperation;
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enum {
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CARD_TYPE_MMC,
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CARD_TYPE_SD,
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CARD_TYPE_SDHC,
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CARD_TYPE_UHS1,
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CARD_TYPE_UHS2,
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CARD_TYPE_SDIO
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};
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// Commands for SD cards defined in SD Specifications Part 1:
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// Physical Layer Simplified Specification Version 8.00
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// They are in the common .h file for the mmc stack because the SDHCI driver
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// currently needs to map them to the corresponding expected response types.
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enum SD_COMMANDS {
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// Basic commands, class 0
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SD_GO_IDLE_STATE = 0,
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SD_ALL_SEND_CID = 2,
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SD_SEND_RELATIVE_ADDR = 3,
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SD_SELECT_DESELECT_CARD = 7,
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SD_SEND_IF_COND = 8,
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SD_SEND_CSD = 9,
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SD_STOP_TRANSMISSION = 12,
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// Block oriented read and write commands, class 2
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SD_READ_SINGLE_BLOCK = 17,
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SD_READ_MULTIPLE_BLOCKS = 18,
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SD_WRITE_SINGLE_BLOCK = 24,
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SD_WRITE_MULTIPLE_BLOCKS = 25,
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// Application specific commands, class 8
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SD_APP_CMD = 55,
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// I/O mode commands, class 9
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SD_IO_ABORT = 52,
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};
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enum SDHCI_APPLICATION_COMMANDS {
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SD_SET_BUS_WIDTH = 6,
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SD_SEND_OP_COND = 41,
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};
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// Interface between mmc_bus and underlying implementation (sdhci_pci or any
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// other thing that can execute mmc commands)
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typedef struct mmc_bus_interface {
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driver_module_info info;
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status_t (*set_clock)(void* controller, uint32_t kilohertz);
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// Configure the bus clock. The bus is initialized with a slow clock
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// that allows device enumeration in all cases, but after enumeration
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// the mmc_bus knows how fast each card can go, and configures the bus
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// accordingly.
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status_t (*execute_command)(void* controller, uint8_t command,
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uint32_t argument, uint32_t* result);
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// Execute a command with no I/O phase
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status_t (*do_io)(void* controller, uint8_t command,
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IOOperation* operation, bool offsetAsSectors);
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// Execute a command that involves a data transfer.
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void (*set_scan_semaphore)(void* controller, sem_id sem);
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// Pass the semaphore used for device rescan to the bus controller
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} mmc_bus_interface;
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// Interface between mmc device driver (mmc_disk, sdio drivers, ...) and mmc_bus
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// This interface is rather generic as it allows implementation of drivers for
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// different type of cards, which will use different commands. The bus
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// provides a generic interface for all of them, and is not specific to any
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// type of card.
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typedef struct mmc_device_interface {
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driver_module_info info;
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status_t (*execute_command)(device_node* node, uint16_t rca,
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uint8_t command, uint32_t argument, uint32_t* result);
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// Execute a command with no I/O phase
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status_t (*do_io)(device_node* controller, uint16_t rca,
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uint8_t command, IOOperation* operation, bool offsetAsSectors);
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// Execute a command that involves a data transfer.
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} mmc_device_interface;
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// Device attribute paths for the MMC device
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static const char* kMmcRcaAttribute = "mmc/rca";
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static const char* kMmcTypeAttribute = "mmc/type";
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#endif /* _MMC_H */
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