serial: 8250_lpss: switch to use 8250_dwlib library

Since we have a common library module for Synopsys DesignWare UART,
let us use it.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20190806094322.64987-5-andriy.shevchenko@linux.intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/8250/8250_lpss.c

@@ -14,7 +14,7 @@
 #include <linux/dmaengine.h>
 #include <linux/dma/dw.h>
 
-#include "8250.h"
+#include "8250_dwlib.h"
 
 #define PCI_DEVICE_ID_INTEL_QRK_UARTx	0x0936
 
@@ -48,21 +48,25 @@ struct lpss8250_board {
 };
 
 struct lpss8250 {
-	int line;
+	struct dw8250_port_data data;
 	struct lpss8250_board *board;
 
 	/* DMA parameters */
-	struct uart_8250_dma dma;
 	struct dw_dma_chip dma_chip;
 	struct dw_dma_slave dma_param;
 	u8 dma_maxburst;
 };
 
+static inline struct lpss8250 *to_lpss8250(struct dw8250_port_data *data)
+{
+	return container_of(data, struct lpss8250, data);
+}
+
 static void byt_set_termios(struct uart_port *p, struct ktermios *termios,
 			    struct ktermios *old)
 {
 	unsigned int baud = tty_termios_baud_rate(termios);
-	struct lpss8250 *lpss = p->private_data;
+	struct lpss8250 *lpss = to_lpss8250(p->private_data);
 	unsigned long fref = lpss->board->freq, fuart = baud * 16;
 	unsigned long w = BIT(15) - 1;
 	unsigned long m, n;
@@ -163,7 +167,7 @@ static const struct dw_dma_platform_data qrk_serial_dma_pdata = {
 
 static void qrk_serial_setup_dma(struct lpss8250 *lpss, struct uart_port *port)
 {
-	struct uart_8250_dma *dma = &lpss->dma;
+	struct uart_8250_dma *dma = &lpss->data.dma;
 	struct dw_dma_chip *chip = &lpss->dma_chip;
 	struct dw_dma_slave *param = &lpss->dma_param;
 	struct pci_dev *pdev = to_pci_dev(port->dev);
@@ -247,7 +251,7 @@ static bool lpss8250_dma_filter(struct dma_chan *chan, void *param)
 
 static int lpss8250_dma_setup(struct lpss8250 *lpss, struct uart_8250_port *port)
 {
-	struct uart_8250_dma *dma = &lpss->dma;
+	struct uart_8250_dma *dma = &lpss->data.dma;
 	struct dw_dma_slave *rx_param, *tx_param;
 	struct device *dev = port->port.dev;
 
@@ -296,7 +300,7 @@ static int lpss8250_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 
 	uart.port.dev = &pdev->dev;
 	uart.port.irq = pdev->irq;
-	uart.port.private_data = lpss;
+	uart.port.private_data = &lpss->data;
 	uart.port.type = PORT_16550A;
 	uart.port.iotype = UPIO_MEM;
 	uart.port.regshift = 2;
@@ -320,7 +324,7 @@ static int lpss8250_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	if (ret < 0)
 		goto err_exit;
 
-	lpss->line = ret;
+	lpss->data.line = ret;
 
 	pci_set_drvdata(pdev, lpss);
 	return 0;
@@ -335,7 +339,7 @@ static void lpss8250_remove(struct pci_dev *pdev)
 {
 	struct lpss8250 *lpss = pci_get_drvdata(pdev);
 
-	serial8250_unregister_port(lpss->line);
+	serial8250_unregister_port(lpss->data.line);
 
 	if (lpss->board->exit)
 		lpss->board->exit(lpss);

drivers/tty/serial/8250/Kconfig

@@ -444,6 +444,7 @@ config SERIAL_8250_LPSS
 	default SERIAL_8250
 	depends on SERIAL_8250 && PCI
 	depends on X86 || COMPILE_TEST
+	select SERIAL_8250_DWLIB
 	select DW_DMAC_CORE if SERIAL_8250_DMA
 	select DW_DMAC_PCI if (SERIAL_8250_DMA && X86_INTEL_LPSS)
 	select RATIONAL