serial: 8250_pci: Add F81504A series Support

Fintek F81504A/508A/512A is PCIE to 4/8/12 UARTs device. It's support
IO/MMIO/PCIE conf to access all functions. The old F81504/508/512 is
only support IO.

Signed-off-by: Ji-Ze Hong (Peter Hong) <hpeter+linux_kernel@gmail.com>
Link: https://lore.kernel.org/r/1565933249-23076-1-git-send-email-hpeter+linux_kernel@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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

@@ -43,6 +43,11 @@ struct pci_serial_quirk {
 	void	(*exit)(struct pci_dev *dev);
 };
 
+struct f815xxa_data {
+	spinlock_t lock;
+	int idx;
+};
+
 #define PCI_NUM_BAR_RESOURCES	6
 
 struct serial_private {
@@ -1707,6 +1712,77 @@ static int pci_fintek_init(struct pci_dev *dev)
 	return max_port;
 }
 
+static void f815xxa_mem_serial_out(struct uart_port *p, int offset, int value)
+{
+	struct f815xxa_data *data = p->private_data;
+	unsigned long flags;
+
+	spin_lock_irqsave(&data->lock, flags);
+	writeb(value, p->membase + offset);
+	readb(p->membase + UART_SCR); /* Dummy read for flush pcie tx queue */
+	spin_unlock_irqrestore(&data->lock, flags);
+}
+
+static int pci_fintek_f815xxa_setup(struct serial_private *priv,
+			    const struct pciserial_board *board,
+			    struct uart_8250_port *port, int idx)
+{
+	struct pci_dev *pdev = priv->dev;
+	struct f815xxa_data *data;
+
+	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->idx = idx;
+	spin_lock_init(&data->lock);
+
+	port->port.private_data = data;
+	port->port.iotype = UPIO_MEM;
+	port->port.flags |= UPF_IOREMAP;
+	port->port.mapbase = pci_resource_start(pdev, 0) + 8 * idx;
+	port->port.serial_out = f815xxa_mem_serial_out;
+
+	return 0;
+}
+
+static int pci_fintek_f815xxa_init(struct pci_dev *dev)
+{
+	u32 max_port, i;
+	int config_base;
+
+	if (!(pci_resource_flags(dev, 0) & IORESOURCE_MEM))
+		return -ENODEV;
+
+	switch (dev->device) {
+	case 0x1204: /* 4 ports */
+	case 0x1208: /* 8 ports */
+		max_port = dev->device & 0xff;
+		break;
+	case 0x1212: /* 12 ports */
+		max_port = 12;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	/* Set to mmio decode */
+	pci_write_config_byte(dev, 0x209, 0x40);
+
+	for (i = 0; i < max_port; ++i) {
+		/* UART0 configuration offset start from 0x2A0 */
+		config_base = 0x2A0 + 0x08 * i;
+
+		/* Select 128-byte FIFO and 8x FIFO threshold */
+		pci_write_config_byte(dev, config_base + 0x01, 0x33);
+
+		/* Enable UART I/O port */
+		pci_write_config_byte(dev, config_base + 0, 0x01);
+	}
+
+	return max_port;
+}
+
 static int skip_tx_en_setup(struct serial_private *priv,
 			const struct pciserial_board *board,
 			struct uart_8250_port *port, int idx)
@@ -2819,6 +2895,30 @@ static struct pci_serial_quirk pci_serial_quirks[] __refdata = {
 		.subdevice	= PCI_ANY_ID,
 		.setup		= pci_moxa_setup,
 	},
+	{
+		.vendor		= 0x1c29,
+		.device		= 0x1204,
+		.subvendor	= PCI_ANY_ID,
+		.subdevice	= PCI_ANY_ID,
+		.setup		= pci_fintek_f815xxa_setup,
+		.init		= pci_fintek_f815xxa_init,
+	},
+	{
+		.vendor		= 0x1c29,
+		.device		= 0x1208,
+		.subvendor	= PCI_ANY_ID,
+		.subdevice	= PCI_ANY_ID,
+		.setup		= pci_fintek_f815xxa_setup,
+		.init		= pci_fintek_f815xxa_init,
+	},
+	{
+		.vendor		= 0x1c29,
+		.device		= 0x1212,
+		.subvendor	= PCI_ANY_ID,
+		.subdevice	= PCI_ANY_ID,
+		.setup		= pci_fintek_f815xxa_setup,
+		.init		= pci_fintek_f815xxa_init,
+	},
 
 	/*
 	 * Default "match everything" terminator entry
@@ -3014,6 +3114,9 @@ enum pci_board_num_t {
 	pbn_fintek_4,
 	pbn_fintek_8,
 	pbn_fintek_12,
+	pbn_fintek_F81504A,
+	pbn_fintek_F81508A,
+	pbn_fintek_F81512A,
 	pbn_wch382_2,
 	pbn_wch384_4,
 	pbn_pericom_PI7C9X7951,
@@ -3773,6 +3876,21 @@ static struct pciserial_board pci_boards[] = {
 		.base_baud	= 115200,
 		.first_offset	= 0x40,
 	},
+	[pbn_fintek_F81504A] = {
+		.num_ports	= 4,
+		.uart_offset	= 8,
+		.base_baud	= 115200,
+	},
+	[pbn_fintek_F81508A] = {
+		.num_ports	= 8,
+		.uart_offset	= 8,
+		.base_baud	= 115200,
+	},
+	[pbn_fintek_F81512A] = {
+		.num_ports	= 12,
+		.uart_offset	= 8,
+		.base_baud	= 115200,
+	},
 	[pbn_wch382_2] = {
 		.flags		= FL_BASE0,
 		.num_ports	= 2,
@@ -5719,6 +5837,9 @@ static const struct pci_device_id serial_pci_tbl[] = {
 	{ PCI_DEVICE(0x1c29, 0x1104), .driver_data = pbn_fintek_4 },
 	{ PCI_DEVICE(0x1c29, 0x1108), .driver_data = pbn_fintek_8 },
 	{ PCI_DEVICE(0x1c29, 0x1112), .driver_data = pbn_fintek_12 },
+	{ PCI_DEVICE(0x1c29, 0x1204), .driver_data = pbn_fintek_F81504A },
+	{ PCI_DEVICE(0x1c29, 0x1208), .driver_data = pbn_fintek_F81508A },
+	{ PCI_DEVICE(0x1c29, 0x1212), .driver_data = pbn_fintek_F81512A },
 
 	/* MKS Tenta SCOM-080x serial cards */
 	{ PCI_DEVICE(0x1601, 0x0800), .driver_data = pbn_b0_4_1250000 },