Tony, > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Tony Lindgren > Sent: Tuesday, March 02, 2010 12:16 AM > To: Raja, Govindraj > Cc: Greg KH; [email protected]; > [email protected]; [email protected]; > Kevin Hilman; Olof Johansson > Subject: Re: [PATCH] serial: Add OMAP high-speed UART driver. > > * Govindraj.R <[email protected]> [100301 06:40]: > > --- /dev/null > > +++ b/drivers/serial/omap-serial.c > > + > > +static void serial_omap_stop_tx(struct uart_port *port) > > +{ > > + struct uart_omap_port *up = (struct uart_omap_port *)port; > > + > > + if (up->use_dma && > > + up->uart_dma.tx_dma_channel != OMAP_UART_DMA_CH_FREE) { > > + /* > > + * Check if dma is still active . If yes do nothing, > > Looks like an extra space here before the period above. > > ... > > > +static int serial_omap_start_rxdma(struct uart_omap_port *up) > > +{ > > + int ret = 0; > > + > > + if (up->uart_dma.rx_dma_channel == -1) { > > + ret = omap_request_dma(up->uart_dma.uart_dma_rx, > > + "UART Rx DMA", > > + (void *)uart_rx_dma_callback, up, > > + &(up->uart_dma.rx_dma_channel)); > > + if (ret < 0) > > + return ret; > > + > > + omap_set_dma_src_params(up->uart_dma.rx_dma_channel, 0, > > + OMAP_DMA_AMODE_CONSTANT, > > + up->uart_dma.uart_base, 0, 0); > > + omap_set_dma_dest_params(up->uart_dma.rx_dma_channel, 0, > > + OMAP_DMA_AMODE_POST_INC, > > + up->uart_dma.rx_buf_dma_phys, 0, 0); > > + > omap_set_dma_transfer_params(up->uart_dma.rx_dma_channel, > > + OMAP_DMA_DATA_TYPE_S8, > > + up->uart_dma.rx_buf_size, 1, > > + OMAP_DMA_SYNC_ELEMENT, > > + up->uart_dma.uart_dma_rx, 0); > > + } > > + up->uart_dma.prev_rx_dma_pos = up->uart_dma.rx_buf_dma_phys; > > + if (cpu_is_omap44xx()) > > + omap_writel(0, OMAP44XX_DMA4_BASE > > + + OMAP_DMA4_CDAC(up->uart_dma.rx_dma_channel)); > > + else > > + omap_writel(0, OMAP34XX_DMA4_BASE > > + + OMAP_DMA4_CDAC(up->uart_dma.rx_dma_channel)); > > NAK. Please don't use omap_read/write for for new code. And do not > tinker with the omap hardware registers directly in the driver. > > This needs to be done properly in arch/arm/plat-omap/dma.c instead.
Thanks for the suggestion. Currently, dma_read/dma_write are #define's in dma.c which cannot be accessed outside dma.c. I don't see any API's in dma.c for setting required value for this register? Can we move dma_read/dma_write to header file so that it can be global or Is there alternate way to perform this operation with existing dma driver? -Manjunath-- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
