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serial: sh-sci: don't filter on DMA device, use only channel ID

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On some sh-mobile systems there are more than one DMA controllers, that
can be used for serial ports. Specifying a DMA device in sh-sci platform
data unnecessarily restricts the driver to only use one DMA controller.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
[Fixed the trivial conflict in include/linux/serial_sci.h]
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Guennadi Liakhovetski 2011-06-24 13:56:15 +02:00 committed by Vinod Koul
parent 7703eac96a
commit 937bb6e4c6
2 changed files with 8 additions and 19 deletions
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25
drivers/tty/serial/sh-sci.c
View File

@ -1439,12 +1439,8 @@ static bool filter(struct dma_chan *chan, void *slave)
dev_dbg(chan->device->dev, "%s: slave ID %d\n", __func__,
param->slave_id);
if (param->dma_dev == chan->device->dev) {
chan->private = param;
return true;
} else {
return false;
}
chan->private = param;
return true;
}
static void rx_timer_fn(unsigned long arg)
@ -1470,10 +1466,10 @@ static void sci_request_dma(struct uart_port *port)
dma_cap_mask_t mask;
int nent;
dev_dbg(port->dev, "%s: port %d DMA %p\n", __func__,
port->line, s->cfg->dma_dev);
dev_dbg(port->dev, "%s: port %d\n", __func__,
port->line);
if (!s->cfg->dma_dev)
if (s->cfg->dma_slave_tx <= 0 || s->cfg->dma_slave_rx <= 0)
return;
dma_cap_zero(mask);
@ -1483,7 +1479,6 @@ static void sci_request_dma(struct uart_port *port)
/* Slave ID, e.g., SHDMA_SLAVE_SCIF0_TX */
param->slave_id = s->cfg->dma_slave_tx;
param->dma_dev = s->cfg->dma_dev;
s->cookie_tx = -EINVAL;
chan = dma_request_channel(mask, filter, param);
@ -1512,7 +1507,6 @@ static void sci_request_dma(struct uart_port *port)
/* Slave ID, e.g., SHDMA_SLAVE_SCIF0_RX */
param->slave_id = s->cfg->dma_slave_rx;
param->dma_dev = s->cfg->dma_dev;
chan = dma_request_channel(mask, filter, param);
dev_dbg(port->dev, "%s: RX: got channel %p\n", __func__, chan);
@ -1557,9 +1551,6 @@ static void sci_free_dma(struct uart_port *port)
{
struct sci_port *s = to_sci_port(port);
if (!s->cfg->dma_dev)
return;
if (s->chan_tx)
sci_tx_dma_release(s, false);
if (s->chan_rx)
@ -1967,9 +1958,9 @@ static int __devinit sci_init_single(struct platform_device *dev,
port->serial_in = sci_serial_in;
port->serial_out = sci_serial_out;
if (p->dma_dev)
dev_dbg(port->dev, "DMA device %p, tx %d, rx %d\n",
p->dma_dev, p->dma_slave_tx, p->dma_slave_rx);
if (p->dma_slave_tx > 0 && p->dma_slave_rx > 0)
dev_dbg(port->dev, "DMA tx %d, rx %d\n",
p->dma_slave_tx, p->dma_slave_rx);
return 0;
}

2
include/linux/serial_sci.h
View File

@ -131,8 +131,6 @@ struct plat_sci_port {
struct plat_sci_port_ops *ops;
struct device *dma_dev;
unsigned int dma_slave_tx;
unsigned int dma_slave_rx;
};