DMA used while receiving bulk data through USB Host Interface in AM335x

lyf sci

Genius 3720 points

Hi Experts,

Does DMA been used while receiving bulk data through USB Host Interface in AM335x ?

Where the exact code snippet could be traced in the Linux Kernel on data reception and USB registers programming ?

over 10 years ago

0 Titusrathinaraj Stalin over 10 years ago

TI__Guru** 116100 points

For AM335x's USB interface, CPPI DMA (MUSB mode) support is available , you can enable it through makemenuconfig.

drivers/usb/musb/cppi_dma.c

0 Titusrathinaraj Stalin over 10 years ago in reply to Titusrathinaraj Stalin

TI__Guru** 116100 points

Hi Lyf,

Small correction.
AM335x is using CPPI41 DMA not CPPI DMA.
In SDK6, the AM335x's DMA driver is "linux-3.2.0-psp04.06.00.11/drivers/usb/musb/cppi41_dma.c"
In SDK7, the AM335x's DMA driver is "linux-3.12.10-ti2013.12.01/drivers/usb/musb/musb_cppi41.c"

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DMA used while receiving bulk data through USB Host Interface in AM335x