UM0851 datasheet(97/245 Pages) STMICROELECTRONICS

tên linh kiện	UM0851

Giải thích chi tiết về linh kiện	SPEAr is a family of highly customizable ARM-based embedded

PDF	245 Pages

Scroll/Zoom	100%

nhà sản xuất	STMICROELECTRONICS [STMicroelectronics]

Trang chủ	http://www.st.com

Logo

97 / 245 page

UM0851

Communication device drivers

Doc ID 16604 Rev 2

97/245

/* host: MMC host to start command

hz: requested frequency */

void mmc_set_clock(struct mmc_host *host, unsigned int hz);

●

Set data bus width:

This function sets the data bus width of a host.

/* host: MMC host to start command

width: requested bus width, it can be one of MMC_BUS_WIDTH_1 or

MMC_BUS_WIDTH_4 */

void mmc_set_bus_width(struct mmc_host *host, unsigned int width);

●

Free host:

After the card has finished working with the host controller, it should free the host. This

can be done using following the call:

/* host: MMC host to free. */

void mmc_release_host(struct mmc_host *host);

●

Driver un-registration:

The card driver must un-register itself after its usage is over. This can be done using the

following function.

/* Drv: MMC media driver. */

int mmc_unregister_driver(struct mmc_driver *drv);

4.7.4

SDIO host controller driver performance

The performance measurement has been performed using:

●

Hardware: ARM926EJS (333MHz) SPEAr300 boards.

●

Kernel: linux-2.6.27

UM0851 bảng dữ liệu(PDF) 97 Page - STMicroelectronics