Author: bms Date: Thu Jan 12 16:30:27 2017 New Revision: 311987 URL: https://svnweb.freebsd.org/changeset/base/311987
Log: Allow uart(4) to use MSI interrupts on single-port PCI instances. Do this here as puc(4) disallows single-port instances; at least one multi-port PCIe UART chip (in this case, the ASIX MCS9922) present separate PCI configuration space (functions) for each UART. Tested using lrzsz and a null-modem cable. The ExpressCard/34 variants containing the MCS9922 should also use MSI with this change. Reviewed by: jhb, imp, rpokala MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D9123 Modified: head/sys/dev/uart/uart_bus_pci.c head/sys/dev/uart/uart_core.c Modified: head/sys/dev/uart/uart_bus_pci.c ============================================================================== --- head/sys/dev/uart/uart_bus_pci.c Thu Jan 12 16:24:10 2017 (r311986) +++ head/sys/dev/uart/uart_bus_pci.c Thu Jan 12 16:30:27 2017 (r311987) @@ -45,12 +45,14 @@ __FBSDID("$FreeBSD$"); #define DEFAULT_RCLK 1843200 static int uart_pci_probe(device_t dev); +static int uart_pci_attach(device_t dev); +static int uart_pci_detach(device_t dev); static device_method_t uart_pci_methods[] = { /* Device interface */ DEVMETHOD(device_probe, uart_pci_probe), - DEVMETHOD(device_attach, uart_bus_attach), - DEVMETHOD(device_detach, uart_bus_detach), + DEVMETHOD(device_attach, uart_pci_attach), + DEVMETHOD(device_detach, uart_pci_detach), DEVMETHOD(device_resume, uart_bus_resume), DEVMETHOD_END }; @@ -209,4 +211,40 @@ uart_pci_probe(device_t dev) return (result); } +static int +uart_pci_attach(device_t dev) +{ + struct uart_softc *sc; + int count; + + sc = device_get_softc(dev); + + /* + * Use MSI in preference to legacy IRQ if available. + * Whilst some PCIe UARTs support >1 MSI vector, use only the first. + */ + if (pci_msi_count(dev) > 0) { + count = 1; + if (pci_alloc_msi(dev, &count) == 0) { + sc->sc_irid = 1; + device_printf(dev, "Using %d MSI message\n", count); + } + } + + return (uart_bus_attach(dev)); +} + +static int +uart_pci_detach(device_t dev) +{ + struct uart_softc *sc; + + sc = device_get_softc(dev); + + if (sc->sc_irid != 0) + pci_release_msi(dev); + + return (uart_bus_detach(dev)); +} + DRIVER_MODULE(uart, pci, uart_pci_driver, uart_devclass, NULL, NULL); Modified: head/sys/dev/uart/uart_core.c ============================================================================== --- head/sys/dev/uart/uart_core.c Thu Jan 12 16:24:10 2017 (r311986) +++ head/sys/dev/uart/uart_core.c Thu Jan 12 16:30:27 2017 (r311987) @@ -677,7 +677,6 @@ uart_bus_attach(device_t dev) * safest thing to do. */ if (filt != FILTER_SCHEDULE_THREAD && !uart_force_poll) { - sc->sc_irid = 0; sc->sc_ires = bus_alloc_resource_any(dev, SYS_RES_IRQ, &sc->sc_irid, RF_ACTIVE | RF_SHAREABLE); } _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
