uart: Match simple comm
Match the PCI simple comm devices (or try to). Be conservative and use legacy interrupts rather than msi messages by default for this 'catch all' since it matches what Linux does (it has opt-in generally for MSI, but also matches more devices because it does a catch-all like implemented in this commit). Sponsored by: Netflix Reviewed by: kbowling Differential Revision: https://reviews.freebsd.org/D32228
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@ -39,6 +39,7 @@ __FBSDID("$FreeBSD$");
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#include <machine/resource.h>
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#include <dev/pci/pcivar.h>
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#include <dev/pci/pcireg.h>
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#include <dev/uart/uart.h>
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#include <dev/uart/uart_bus.h>
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@ -218,6 +219,12 @@ uart_pci_probe(device_t dev)
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{
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struct uart_softc *sc;
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const struct pci_id *id;
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struct pci_id cid = {
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.regshft = 0,
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.rclk = 0,
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.rid = 0x10 | PCI_NO_MSI,
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.desc = "Generic SimpleComm PCI device",
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};
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int result;
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sc = device_get_softc(dev);
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@ -227,6 +234,14 @@ uart_pci_probe(device_t dev)
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sc->sc_class = &uart_ns8250_class;
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goto match;
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}
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if (pci_get_class(dev) == PCIC_SIMPLECOMM &&
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pci_get_subclass(dev) == PCIS_SIMPLECOMM_UART &&
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pci_get_progif(dev) < PCIP_SIMPLECOMM_UART_16550A) {
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/* XXX rclk what to do */
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id = &cid;
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sc->sc_class = &uart_ns8250_class;
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goto match;
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}
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/* Add checks for non-ns8250 IDs here. */
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return (ENXIO);
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