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>

diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c
index 76d58bd..83e21b6 100644 (file)
--- a/drivers/tty/serial/8250/8250_pci.c
+++ b/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 },