tty: serial: 8250: Add SystemBase Multi I/O cards

Add support for the SystemBase Multi I/O serial cards, which are
"compatible" with a standard 16550A controllers, except that they need
to have their interrupts enabled in a proprietary way.

Tested with a Delock "Serial PCI Express x1 Card 8x Serial RS-232".

Signed-off-by: Michael Walle <mwalle@kernel.org>
Link: https://patch.msgid.link/20260225081739.946723-1-mwalle@kernel.org
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 aa1ab4da9ff1b57c530aa7a1e6c5bf2523cda32c..e2bea501d3cf79ac0cd6fd22746cc7aae93f56de 100644 (file)
--- a/drivers/tty/serial/8250/8250_pci.c
+++ b/drivers/tty/serial/8250/8250_pci.c
@@ -100,6 +100,8 @@
 #define PCI_DEVICE_ID_ADDIDATA_CPCI7420_NG     0x7025
 #define PCI_DEVICE_ID_ADDIDATA_CPCI7300_NG     0x7026
 
+#define PCI_VENDOR_ID_SYSTEMBASE       0x14a1
+
 /* Unknown vendors/cards - this should not be in linux/pci_ids.h */
 #define PCI_SUBDEVICE_ID_UNKNOWN_0x1584        0x1584
 #define PCI_SUBDEVICE_ID_UNKNOWN_0x1588        0x1588
@@ -2128,6 +2130,35 @@ pci_moxa_setup(struct serial_private *priv,
        return setup_port(priv, port, bar, offset, 0);
 }
 
+#define SB_OPTR_IMR0   0x0c /* Interrupt mask register, p0 to p7 */
+static int pci_systembase_init(struct pci_dev *dev)
+{
+       resource_size_t iobase;
+
+       if (!IS_ENABLED(CONFIG_HAS_IOPORT))
+               return serial_8250_warn_need_ioport(dev);
+
+       iobase = pci_resource_start(dev, 1);
+
+       /* This will support up to 8 ports */
+       outb(0xff, iobase + SB_OPTR_IMR0);
+
+       return 0;
+}
+
+static void pci_systembase_exit(struct pci_dev *dev)
+{
+       resource_size_t iobase;
+
+       if (!IS_ENABLED(CONFIG_HAS_IOPORT)) {
+               serial_8250_warn_need_ioport(dev);
+               return;
+       }
+
+       iobase = pci_resource_start(dev, 0);
+       outb(0x00, iobase + SB_OPTR_IMR0);
+}
+
 /*
  * Master list of serial port init/setup/exit quirks.
  * This does not describe the general nature of the port.
@@ -2476,6 +2507,16 @@ static struct pci_serial_quirk pci_serial_quirks[] = {
                .init           = pci_siig_init,
                .setup          = pci_siig_setup,
        },
+       /* Systembase */
+       {
+               .vendor         = PCI_VENDOR_ID_SYSTEMBASE,
+               .device         = 0x0008,
+               .subvendor      = PCI_ANY_ID,
+               .subdevice      = PCI_ANY_ID,
+               .init           = pci_systembase_init,
+               .setup          = pci_default_setup,
+               .exit           = pci_systembase_exit,
+       },
        /*
         * Titan cards
         */
@@ -3041,6 +3082,7 @@ enum pci_board_num_t {
        pbn_b0_1_921600,
        pbn_b0_2_921600,
        pbn_b0_4_921600,
+       pbn_b0_8_921600,
 
        pbn_b0_2_1130000,
 
@@ -3241,6 +3283,12 @@ static struct pciserial_board pci_boards[] = {
                .base_baud      = 921600,
                .uart_offset    = 8,
        },
+       [pbn_b0_8_921600] = {
+               .flags          = FL_BASE0,
+               .num_ports      = 8,
+               .base_baud      = 921600,
+               .uart_offset    = 8,
+       },
 
        [pbn_b0_2_1130000] = {
                .flags          = FL_BASE0,
@@ -6152,6 +6200,9 @@ static const struct pci_device_id serial_pci_tbl[] = {
                PCI_ANY_ID, PCI_ANY_ID,
                0, 0, pbn_b0_1_115200 },
 
+       /* Systembase Multi I/O cards */
+       { PCI_VDEVICE(SYSTEMBASE, 0x0008), pbn_b0_8_921600 },
+
        /* Fintek PCI serial cards */
        { PCI_DEVICE(0x1c29, 0x1104), .driver_data = pbn_fintek_4 },
        { PCI_DEVICE(0x1c29, 0x1108), .driver_data = pbn_fintek_8 },