diff options
| author | Ray Jui <rjui@broadcom.com> | 2014-10-07 17:35:47 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-11-05 19:24:07 -0800 |
| commit | a8b26e1af94825296f29eee6bfc001c5543d3c7e (patch) | |
| tree | c52a4952234096d27ff71ac360fb303c97462ecb /drivers/tty | |
| parent | 10263f656a23e303d9d2ae1336ea6ff83f0714ef (diff) | |
| download | op-kernel-dev-a8b26e1af94825296f29eee6bfc001c5543d3c7e.zip op-kernel-dev-a8b26e1af94825296f29eee6bfc001c5543d3c7e.tar.gz | |
serial: 8250_dw: Add DMA support for non-ACPI platforms
The dma pointer under struct uart_8250_port is currently left
unassigned for non-ACPI platforms. It should be pointing to the dma
member in struct dw8250_data like how it was done for ACPI, so the core
8250 code will try to request for DMA when registering the port
If DMA is not enabled in device tree, request DMA will fail and the
driver will fall back to PIO
Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: JD (Jiandong) Zheng <jdzheng@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
Tested-by: Scott Branden <sbranden@broadcom.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/8250/8250_dw.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c index beea6ca..73a14ae 100644 --- a/drivers/tty/serial/8250/8250_dw.c +++ b/drivers/tty/serial/8250/8250_dw.c @@ -290,6 +290,14 @@ static int dw8250_probe_of(struct uart_port *p, if (has_ucv) dw8250_setup_port(up); + /* if we have a valid fifosize, try hooking up DMA here */ + if (p->fifosize) { + up->dma = &data->dma; + + up->dma->rxconf.src_maxburst = p->fifosize / 4; + up->dma->txconf.dst_maxburst = p->fifosize / 4; + } + if (!of_property_read_u32(np, "reg-shift", &val)) p->regshift = val; |
