diff options
| -rw-r--r-- | drivers/tty/serial/8250/8250_dw.c | 75 |
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 de7a1869c82..09aaea2d3a6 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 { |