[PATCH] ns16550: add Asix AX99100 serial card

[Marek Marczykowski-Górecki]

It's 4-port serial card, each port is presented as a separate function.
According to the specification, it features 256-byte TX FIFO buffer.

Signed-off-by: Marek Marczykowski-Górecki <marma...@invisiblethingslab.com>
---
It's a card plugged into a box that can function as yet another gitlab runner.
---
 xen/drivers/char/ns16550.c | 12 ++++++++++++
 xen/include/xen/pci_ids.h  |  2 ++
 2 files changed, 14 insertions(+)

diff --git a/xen/drivers/char/ns16550.c b/xen/drivers/char/ns16550.c
index 97bf0985344a..00c0da3f373c 100644
--- a/xen/drivers/char/ns16550.c
+++ b/xen/drivers/char/ns16550.c
@@ -92,6 +92,7 @@ struct ns16550_config {
         param_exar_xr17v354,
         param_exar_xr17v358,
         param_intel_lpss,
+        param_asix_ax99100,
     } param;
 };
 
@@ -842,6 +843,12 @@ static const struct ns16550_config_param __initconst 
uart_param[] = {
         .mmio = 1,
         .max_ports = 1,
     },
+    [param_asix_ax99100] = {
+        .reg_width = 1,
+        .lsr_mask = UART_LSR_THRE,
+        .max_ports = 1,
+        .fifo_size = 256,
+    },
 };
 
 static const struct ns16550_config __initconst uart_config[] =
@@ -1170,6 +1177,11 @@ static const struct ns16550_config __initconst 
uart_config[] =
         .dev_id = 0x7adc,
         .param = param_intel_lpss
     },
+    {
+        .vendor_id = PCI_VENDOR_ID_ASIX,
+        .dev_id = 9100,
+        .param = param_asix_ax99100
+    },
 };
 
 static int __init
diff --git a/xen/include/xen/pci_ids.h b/xen/include/xen/pci_ids.h
index e798477a7e23..2a19f4ab7872 100644
--- a/xen/include/xen/pci_ids.h
+++ b/xen/include/xen/pci_ids.h
@@ -11,3 +11,5 @@
 #define PCI_VENDOR_ID_BROADCOM           0x14e4
 
 #define PCI_VENDOR_ID_INTEL              0x8086
+
+#define PCI_VENDOR_ID_ASIX               0x125b
-- 
2.43.0