From d0cc3d4100e829d726d7c0fbf5b7b8d2146f60ba Mon Sep 17 00:00:00 2001 From: Martin Fuzzey Date: Fri, 1 Oct 2010 00:21:59 +0200 Subject: USB: imx21-hcd accept arbitary transfer buffer alignement. The hardware can only do DMA to 4 byte aligned addresses. When this requirement is not met use PIO or a bounce buffer. PIO is used when the buffer is small enough to directly use the hardware data memory (2*maxpacket). A bounce buffer is used for larger transfers. Signed-off-by: Martin Fuzzey Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/imx21-hcd.h | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) (limited to 'drivers/usb/host/imx21-hcd.h') diff --git a/drivers/usb/host/imx21-hcd.h b/drivers/usb/host/imx21-hcd.h index 1b0d913780a..87b29fd971b 100644 --- a/drivers/usb/host/imx21-hcd.h +++ b/drivers/usb/host/imx21-hcd.h @@ -250,6 +250,7 @@ #define USBCTRL_USB_BYP (1 << 2) #define USBCTRL_HOST1_TXEN_OE (1 << 1) +#define USBOTG_DMEM 0x1000 /* Values in TD blocks */ #define TD_DIR_SETUP 0 @@ -346,8 +347,8 @@ struct td { struct list_head list; struct urb *urb; struct usb_host_endpoint *ep; - dma_addr_t data; - unsigned long buf_addr; + dma_addr_t dma_handle; + void *cpu_buffer; int len; int frame; int isoc_index; @@ -360,6 +361,8 @@ struct etd_priv { struct td *td; struct list_head queue; dma_addr_t dma_handle; + void *cpu_buffer; + void *bounce_buffer; int alloc; int len; int dmem_size; @@ -412,6 +415,7 @@ struct debug_isoc_trace { struct imx21 { spinlock_t lock; struct device *dev; + struct usb_hcd *hcd; struct mx21_usbh_platform_data *pdata; struct list_head dmem_list; struct list_head queue_for_etd; /* eps queued due to etd shortage */ -- cgit v1.2.3-70-g09d2