tty: serial: 8250: Add support for MOXA Mini PCIe boards

Add support for MOXA Mini PCIe serial boards:

- CP102N: 2 ports | RS232
- CP104N: 4 ports | RS232
- CP112N: 2 ports | RS232/RS422/RS485
- CP114N: 4 ports | RS232/RS422/RS485
- CP132N: 2 ports | RS422/RS485
- CP134N: 4 ports | RS422/RS485

Signed-off-by: Crescent CY Hsieh <crescentcy.hsieh@moxa.com>
Reviewed-by: Jiri Slaby <jirislaby@kernel.org>
Link: https://lore.kernel.org/r/20231018091739.10125-5-crescentcy.hsieh@moxa.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 dd48b910bb05f7180fcf03368b8aa49988e43754..d22f727491b543559d6b44614f376457f86f3002 100644 (file)
--- a/drivers/tty/serial/8250/8250_pci.c
+++ b/drivers/tty/serial/8250/8250_pci.c
@@ -83,14 +83,20 @@
 
 #define PCI_DEVICE_ID_MOXA_CP102E      0x1024
 #define PCI_DEVICE_ID_MOXA_CP102EL     0x1025
+#define PCI_DEVICE_ID_MOXA_CP102N      0x1027
 #define PCI_DEVICE_ID_MOXA_CP104EL_A   0x1045
+#define PCI_DEVICE_ID_MOXA_CP104N      0x1046
+#define PCI_DEVICE_ID_MOXA_CP112N      0x1121
 #define PCI_DEVICE_ID_MOXA_CP114EL     0x1144
+#define PCI_DEVICE_ID_MOXA_CP114N      0x1145
 #define PCI_DEVICE_ID_MOXA_CP116E_A_A  0x1160
 #define PCI_DEVICE_ID_MOXA_CP116E_A_B  0x1161
 #define PCI_DEVICE_ID_MOXA_CP118EL_A   0x1182
 #define PCI_DEVICE_ID_MOXA_CP118E_A_I  0x1183
 #define PCI_DEVICE_ID_MOXA_CP132EL     0x1322
+#define PCI_DEVICE_ID_MOXA_CP132N      0x1323
 #define PCI_DEVICE_ID_MOXA_CP134EL_A   0x1342
+#define PCI_DEVICE_ID_MOXA_CP134N      0x1343
 #define PCI_DEVICE_ID_MOXA_CP138E_A    0x1381
 #define PCI_DEVICE_ID_MOXA_CP168EL_A   0x1683
 
@@ -1959,6 +1965,49 @@ pci_sunix_setup(struct serial_private *priv,
        return setup_port(priv, port, bar, offset, 0);
 }
 
+#define MOXA_PUART_GPIO_EN     0x09
+#define MOXA_PUART_GPIO_OUT    0x0A
+
+#define MOXA_GPIO_PIN2 BIT(2)
+
+static bool pci_moxa_is_mini_pcie(unsigned short device)
+{
+       if (device == PCI_DEVICE_ID_MOXA_CP102N ||
+           device == PCI_DEVICE_ID_MOXA_CP104N ||
+           device == PCI_DEVICE_ID_MOXA_CP112N ||
+           device == PCI_DEVICE_ID_MOXA_CP114N ||
+           device == PCI_DEVICE_ID_MOXA_CP132N ||
+           device == PCI_DEVICE_ID_MOXA_CP134N)
+               return true;
+
+       return false;
+}
+
+static int pci_moxa_init(struct pci_dev *dev)
+{
+       unsigned short device = dev->device;
+       resource_size_t iobar_addr = pci_resource_start(dev, 2);
+       unsigned int num_ports = (device & 0x00F0) >> 4;
+       u8 val;
+
+       /*
+        * Enable hardware buffer to prevent break signal output when system boots up.
+        * This hardware buffer is only supported on Mini PCIe series.
+        */
+       if (pci_moxa_is_mini_pcie(device)) {
+               /* Set GPIO direction */
+               val = inb(iobar_addr + MOXA_PUART_GPIO_EN);
+               val |= MOXA_GPIO_PIN2;
+               outb(val, iobar_addr + MOXA_PUART_GPIO_EN);
+               /* Enable low GPIO */
+               val = inb(iobar_addr + MOXA_PUART_GPIO_OUT);
+               val &= ~MOXA_GPIO_PIN2;
+               outb(val, iobar_addr + MOXA_PUART_GPIO_OUT);
+       }
+
+       return num_ports;
+}
+
 static int
 pci_moxa_setup(struct serial_private *priv,
                const struct pciserial_board *board,
@@ -2635,6 +2684,7 @@ static struct pci_serial_quirk pci_serial_quirks[] = {
                .device         = PCI_ANY_ID,
                .subvendor      = PCI_ANY_ID,
                .subdevice      = PCI_ANY_ID,
+               .init           = pci_moxa_init,
                .setup          = pci_moxa_setup,
        },
        {
@@ -5351,14 +5401,20 @@ static const struct pci_device_id serial_pci_tbl[] = {
         */
        { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102E),     pbn_moxa_2 },
        { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102EL),    pbn_moxa_2 },
+       { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102N),     pbn_moxa_2 },
        { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104EL_A),  pbn_moxa_4 },
+       { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104N),     pbn_moxa_4 },
+       { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP112N),     pbn_moxa_2 },
        { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP114EL),    pbn_moxa_4 },
+       { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP114N),     pbn_moxa_4 },
        { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP116E_A_A), pbn_moxa_8 },
        { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP116E_A_B), pbn_moxa_8 },
        { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118EL_A),  pbn_moxa_8 },
        { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118E_A_I), pbn_moxa_8 },
        { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132EL),    pbn_moxa_2 },
+       { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132N),     pbn_moxa_2 },
        { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP134EL_A),  pbn_moxa_4 },
+       { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP134N),     pbn_moxa_4 },
        { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP138E_A),   pbn_moxa_8 },
        { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168EL_A),  pbn_moxa_8 },