summaryrefslogtreecommitdiffstats
path: root/drivers/tty
diff options
context:
space:
mode:
authorHeikki Krogerus <heikki.krogerus@linux.intel.com>2013-04-10 16:58:30 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-04-11 13:21:17 -0700
commit94b2b47cf68ce4633a1dbe9d221617404b5de03b (patch)
tree246f2395cb9aee1f2170ffdd7dc819a8a503c8ec /drivers/tty
parentaea02e87f6076f2a29d537829503e1344e92a3b8 (diff)
downloadblackbird-op-linux-94b2b47cf68ce4633a1dbe9d221617404b5de03b.tar.gz
blackbird-op-linux-94b2b47cf68ce4633a1dbe9d221617404b5de03b.zip
serial: 8250_dw: Let ACPI code extract the DMA client info
The new ACPI DMA helpers in dmaengine API can take care of extracting all the necessary information regarding DMA. The driver does not need to do this separately any more. Signed-off-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.c75
1 files changed, 9 insertions, 66 deletions
diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index de7a1869c82c..09aaea2d3a6c 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -163,66 +163,10 @@ static int dw8250_probe_of(struct uart_port *p)
}
#ifdef CONFIG_ACPI
-static bool dw8250_acpi_dma_filter(struct dma_chan *chan, void *parm)
-{
- return chan->chan_id == *(int *)parm;
-}
-
-static acpi_status
-dw8250_acpi_walk_resource(struct acpi_resource *res, void *data)
-{
- struct uart_port *p = data;
- struct uart_8250_port *port;
- struct uart_8250_dma *dma;
- struct acpi_resource_fixed_dma *fixed_dma;
- struct dma_slave_config *slave;
-
- port = container_of(p, struct uart_8250_port, port);
-
- switch (res->type) {
- case ACPI_RESOURCE_TYPE_FIXED_DMA:
- fixed_dma = &res->data.fixed_dma;
-
- /* TX comes first */
- if (!port->dma) {
- dma = devm_kzalloc(p->dev, sizeof(*dma), GFP_KERNEL);
- if (!dma)
- return AE_NO_MEMORY;
-
- port->dma = dma;
- slave = &dma->txconf;
-
- slave->direction = DMA_MEM_TO_DEV;
- slave->dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
- slave->slave_id = fixed_dma->request_lines;
- slave->dst_maxburst = port->tx_loadsz / 4;
-
- dma->tx_chan_id = fixed_dma->channels;
- dma->tx_param = &dma->tx_chan_id;
- dma->fn = dw8250_acpi_dma_filter;
- } else {
- dma = port->dma;
- slave = &dma->rxconf;
-
- slave->direction = DMA_DEV_TO_MEM;
- slave->src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
- slave->slave_id = fixed_dma->request_lines;
- slave->src_maxburst = p->fifosize / 4;
-
- dma->rx_chan_id = fixed_dma->channels;
- dma->rx_param = &dma->rx_chan_id;
- }
-
- break;
- }
-
- return AE_OK;
-}
-
-static int dw8250_probe_acpi(struct uart_port *p)
+static int dw8250_probe_acpi(struct uart_8250_port *up)
{
const struct acpi_device_id *id;
- acpi_status status;
+ struct uart_port *p = &up->port;
id = acpi_match_device(p->dev->driver->acpi_match_table, p->dev);
if (!id)
@@ -236,13 +180,12 @@ static int dw8250_probe_acpi(struct uart_port *p)
if (!p->uartclk)
p->uartclk = (unsigned int)id->driver_data;
- status = acpi_walk_resources(ACPI_HANDLE(p->dev), METHOD_NAME__CRS,
- dw8250_acpi_walk_resource, p);
- if (ACPI_FAILURE(status)) {
- dev_err_ratelimited(p->dev, "%s failed \"%s\"\n", __func__,
- acpi_format_exception(status));
- return -ENODEV;
- }
+ up->dma = devm_kzalloc(p->dev, sizeof(*up->dma), GFP_KERNEL);
+ if (!up->dma)
+ return -ENOMEM;
+
+ up->dma->rxconf.src_maxburst = p->fifosize / 4;
+ up->dma->txconf.dst_maxburst = p->fifosize / 4;
return 0;
}
@@ -329,7 +272,7 @@ static int dw8250_probe(struct platform_device *pdev)
if (err)
return err;
} else if (ACPI_HANDLE(&pdev->dev)) {
- err = dw8250_probe_acpi(&uart.port);
+ err = dw8250_probe_acpi(&uart);
if (err)
return err;
} else {
OpenPOWER on IntegriCloud