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;
+
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);
--
2.8.0.rc3
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