SceSdif

Sdif likely stands for Storage Device InterFace. SceSdif is a kernel module that is primary responsible for communicating with SD devices. This includes eMMC (internal storage), gamecard MMC, SD/micro SD card, Wlan/Bt SDIO devices. Memory Card is handled by SceMsif instead as it uses an authentication security layer.

To communicate with a particular device SceSdif module uses device index (sd_ctx_index).

There is one more index value that closely correlates with Device Index. This is speculated to be Device Type Index. It is initialized by internal subroutine that does preinitialization (cmd0, cmd8, cmd5_sdio, cmd55, acmd41). Value is typically stored in sd_context_data structure in field dev_type_idx.

Allocated blocks
During initialization step Sdif driver allocates couple of memory blocks. This happens when 'module_start' function is called, inside 'init' function.

There are 2 blocks per device context. Each block is named as SceSdif where N is array index.

First block is of size 0x1000 - SceUID and void* are stored in sd_context_data per device context.

Second block is of size 0x10000 - SceUID and void* are stored in sd_context_data per device context.

First block is DMA copied to / from corresponding SceSdif physical address.

First block looks like to have layout that corresponds to standard SD/MMC host that is described in "Physical Layer Simplified Specification".

sceSdifMemoryCardEnableSlowModeForDriver
Temp name was sceSdifEnableSlowCardModeForDriver.

sets slow_mode flag in sd_context_data for gamecard device

also tries to set flag for device with index 3 but it does not actually exist

sceSdifDisableSlowCardModeForDriver
Temp name was sceSdifMemoryCardEnableSlowModeForDriver.

resets slow_mode flag in sd_context_data for gamecard device

also tries to reset flag for device with index 3 but it does not actually exist

sceSdifMemoryCardGetCardInsertStateForDriver
Temp name was sceSdifGetCardInsertState1ForDriver, get_card_insert_state1.

gc_cmd56_request
sceMmcSendGeneralCmdData

initialize_mmc_device
this function only initializes devices with sd_ctx_index 0 and 1 and returns 0x80320013 on any other sd_ctx_index

it is confirmed that this function sends sequence of commands that correspond to MMC initialization protocol

wlan_bt_acquiredev
Called in initialization sequence.

wlan_bt_release
Called in failures. Assumed to be release of sdio device.

sceSdioReadForDriver
Reads from Wlan/BT SDIO device.

Example from SceWlanBt:

sceSdioWriteForDriver
Writes from wlan sdio device.

Type variable seems to define which access to use. 1 is for register access, 2 is for data access.

wlan_bt_initialize_custom_context2
this function can send these commands: cmd3, cmd52_sdio, cmd0, cmd5_sdio, cmd55, acmd41, cmd7, cmd8

this function uses array of 2 custom contexts.

this function can either set device type index to 3 and use custom context for initialization.

or it can use preinitialization (cmd0, cmd8, cmd5_sdio, cmd55, acmd41) and then check that device type index is 3.

if device type index is not 3 then 0x80320017 error is returned.

wlan_bt_bulk_transfer
This is a guessed name.

This function is used in aggregated frame transmit when more than one packet is being transmitted over Wlan.

wlan_bt_get_wlan_context
Get wlan_context for sdio device. Vidpid is an array with Marvell Vid and Wlan/Bt pid.

For Wlan: vidpid = [0x2df, 0x911a]. For Bt: vidpid = [0x2df, 0x9119].

sceSdifGoStandbyStateForDriver
Temp name was wlan_bt_cmd7.

wlan_bt_initialize_custom_context1
This function is just a wrapper for wlan_bt_initialize_custom_context2.

sddev_get_sd_cidForDriver
This is the name of the subroutine. Temp name was sdstor_get_cidForDriver, sceSdifGetCIDForDriver.

initialize_sd_device
This function sends sequence of commands that correspond to SD initialization protocol. These commands include: cmd0, cmd8, cmd5_sdio, cmd2, cmd3, cmd6, cmd9, cmd7, cmd16. Some paired commands are: (cmd55, acmd41), (cmd55, acmd42), (cmd55, acmd13), (cmd55, acmd51).
 * it does not check sd_ctx_index argument.
 * it uses array of 3 custom contexts instead of sd_context_part structures.
 * it checks device type index after preinitialization (cmd0, cmd8, cmd5_sdio, cmd55, acmd41)
 * it only initializes device with device type index 2. otherwise 0x80320017 error is returned.

sendWriteProtectStatusForDriver
Temp name was sdstor_cmd6_cmd30.

sceMmcWriteSectorInternalForDriver
Temp name was sceMmcWriteSector2ForDriver.

sceSdWriteSectorInternalForDriver
Temp name was sceSdWriteSector2ForDriver.

reset_to_low_speed_mode
this function sends CMD0 reset command to the card

then enables (Internal Clock Enable) bit

then waits til clock is stable (Internal Clock Stable)

then enables (SD Clock Enable) bit for sdio device

then resets (High Speed Enable) bit

then resets (Data Transfer Width) bit

then resets (Extended Data Transfer Width) bit

set_default_sector_size_mmc
this function internally also executes CMD16 which sets BLOCKLEN