On 04/07/2016 01:37 PM, Andy Shevchenko wrote:
> Some UARTs, e.g. one is used in Intel Quark, have a different address base for
> DMA operations. Introduce an additional field in struct uart_8250_dma to cover
> those cases.
>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
> ---
> drivers/tty/serial/8250/8250.h | 2 ++
> drivers/tty/serial/8250/8250_dma.c | 5 +++--
> 2 files changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/tty/serial/8250/8250.h b/drivers/tty/serial/8250/8250.h
> index 047a7ba..040deb2 100644
> --- a/drivers/tty/serial/8250/8250.h
> +++ b/drivers/tty/serial/8250/8250.h
> @@ -31,6 +31,8 @@ struct uart_8250_dma {
> struct dma_chan *rxchan;
> struct dma_chan *txchan;
>
> + phys_addr_t dma_addr;
> +
Let's add separate rx and tx device addrs.
> dma_addr_t rx_addr;
> dma_addr_t tx_addr;
>
> diff --git a/drivers/tty/serial/8250/8250_dma.c b/drivers/tty/serial/8250/8250_dma.c
> index b134bec..a314492 100644
> --- a/drivers/tty/serial/8250/8250_dma.c
> +++ b/drivers/tty/serial/8250/8250_dma.c
> @@ -164,16 +164,17 @@ int serial8250_rx_dma(struct uart_8250_port *p, unsigned int iir)
> int serial8250_request_dma(struct uart_8250_port *p)
> {
> struct uart_8250_dma *dma = p->dma;
> + phys_addr_t dma_addr = dma->dma_addr ? dma->dma_addr : p->port.mapbase;
> dma_cap_mask_t mask;
>
> /* Default slave configuration parameters */
> dma->rxconf.direction = DMA_DEV_TO_MEM;
> dma->rxconf.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
> - dma->rxconf.src_addr = p->port.mapbase + UART_RX;
> + dma->rxconf.src_addr = dma_addr + UART_RX;
>
> dma->txconf.direction = DMA_MEM_TO_DEV;
> dma->txconf.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
> - dma->txconf.dst_addr = p->port.mapbase + UART_TX;
> + dma->txconf.dst_addr = dma_addr + UART_TX;
>
> dma_cap_zero(mask);
> dma_cap_set(DMA_SLAVE, mask);
>
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