serial: 8250_lpss: move Quark code from PCI driver

Intel Quark has DesignWare UART. Move the code from 8250_pci to 8250_lpss.

Reviewed-by: Bryan O'Donoghue <pure.logic@nexus-software.ie>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-by: Bryan O'Donoghue <pure.logic@nexus-software.ie>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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

@@ -19,6 +19,8 @@
 
 #include "8250.h"
 
+#define PCI_DEVICE_ID_INTEL_QRK_UARTx	0x0936
+
 #define PCI_DEVICE_ID_INTEL_BYT_UART1	0x0f0a
 #define PCI_DEVICE_ID_INTEL_BYT_UART2	0x0f0c
 
@@ -166,6 +168,9 @@ static int lpss8250_dma_setup(struct lpss8250 *lpss, struct uart_8250_port *port
 	struct dw_dma_slave *rx_param, *tx_param;
 	struct device *dev = port->port.dev;
 
+	if (!lpss->dma_param.dma_dev)
+		return 0;
+
 	rx_param = devm_kzalloc(dev, sizeof(*rx_param), GFP_KERNEL);
 	if (!rx_param)
 		return -ENOMEM;
@@ -253,9 +258,15 @@ static const struct lpss8250_board byt_board = {
 	.setup = byt_serial_setup,
 };
 
+static const struct lpss8250_board qrk_board = {
+	.freq = 44236800,
+	.base_baud = 2764800,
+};
+
 #define LPSS_DEVICE(id, board) { PCI_VDEVICE(INTEL, id), (kernel_ulong_t)&board }
 
 static const struct pci_device_id pci_ids[] = {
+	LPSS_DEVICE(PCI_DEVICE_ID_INTEL_QRK_UARTx, qrk_board),
 	LPSS_DEVICE(PCI_DEVICE_ID_INTEL_BYT_UART1, byt_board),
 	LPSS_DEVICE(PCI_DEVICE_ID_INTEL_BYT_UART2, byt_board),
 	LPSS_DEVICE(PCI_DEVICE_ID_INTEL_BSW_UART1, byt_board),

drivers/tty/serial/8250/8250_pci.c

@@ -1776,7 +1776,6 @@ pci_wch_ch38x_setup(struct serial_private *priv,
 #define PCI_DEVICE_ID_COMMTECH_4222PCIE	0x0022
 #define PCI_DEVICE_ID_BROADCOM_TRUMANAGE 0x160a
 #define PCI_DEVICE_ID_AMCC_ADDIDATA_APCI7800 0x818e
-#define PCI_DEVICE_ID_INTEL_QRK_UART	0x0936
 
 #define PCI_VENDOR_ID_SUNIX		0x1fd4
 #define PCI_DEVICE_ID_SUNIX_1999	0x1999
@@ -2755,7 +2754,6 @@ enum pci_board_num_t {
 	pbn_ADDIDATA_PCIe_4_3906250,
 	pbn_ADDIDATA_PCIe_8_3906250,
 	pbn_ce4100_1_115200,
-	pbn_qrk,
 	pbn_omegapci,
 	pbn_NETMOS9900_2s_115200,
 	pbn_brcm_trumanage,
@@ -3531,12 +3529,6 @@ static struct pciserial_board pci_boards[] = {
 		.base_baud	= 921600,
 		.reg_shift      = 2,
 	},
-	[pbn_qrk] = {
-		.flags		= FL_BASE0,
-		.num_ports	= 1,
-		.base_baud	= 2764800,
-		.reg_shift	= 2,
-	},
 	[pbn_omegapci] = {
 		.flags		= FL_BASE0,
 		.num_ports	= 8,
@@ -3650,6 +3642,7 @@ static const struct pci_device_id blacklist[] = {
 	{ PCI_VDEVICE(INTEL, 0x19d8), },
 
 	/* Intel platforms with DesignWare UART */
+	{ PCI_VDEVICE(INTEL, 0x0936), },
 	{ PCI_VDEVICE(INTEL, 0x0f0a), },
 	{ PCI_VDEVICE(INTEL, 0x0f0c), },
 	{ PCI_VDEVICE(INTEL, 0x228a), },
@@ -5322,12 +5315,6 @@ static struct pci_device_id serial_pci_tbl[] = {
 		PCI_ANY_ID,  PCI_ANY_ID, 0, 0,
 		pbn_ce4100_1_115200 },
 
-	/*
-	 * Intel Quark x1000
-	 */
-	{	PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_QRK_UART,
-		PCI_ANY_ID, PCI_ANY_ID, 0, 0,
-		pbn_qrk },
 	/*
 	 * Cronyx Omega PCI
 	 */

drivers/tty/serial/8250/Kconfig

@@ -415,6 +415,7 @@ config SERIAL_8250_LPSS
 	  present on the UART found on various Intel platforms such as:
 	    - Intel Baytrail SoC
 	    - Intel Braswell SoC
+	    - Intel Quark X1000 SoC
 
 config SERIAL_8250_MID
 	tristate "Support for serial ports on Intel MID platforms" if EXPERT