From fe16530885776c55b0547114e0d5851a9efd909a Mon Sep 17 00:00:00 2001
From: Alexander Motin <mav@FreeBSD.org>
Date: Fri, 24 Oct 2008 21:21:43 +0000
Subject: [PATCH] Add MSI support.
Tested on: Acer TravelMate 6292 with 0x4229 chip.
Reviewed by: sam@
---
sys/dev/iwn/if_iwn.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/sys/dev/iwn/if_iwn.c b/sys/dev/iwn/if_iwn.c
index 332c2ce6b043..8421944d9ab5 100644
--- a/sys/dev/iwn/if_iwn.c
+++ b/sys/dev/iwn/if_iwn.c
@@ -253,7 +253,7 @@ iwn_attach(device_t dev)
struct iwn_softc *sc = (struct iwn_softc *)device_get_softc(dev);
struct ieee80211com *ic;
struct ifnet *ifp;
- int i, error;
+ int i, error, result;
sc->sc_dev = dev;
@@ -282,6 +282,9 @@ iwn_attach(device_t dev)
sc->sc_st = rman_get_bustag(sc->mem);
sc->sc_sh = rman_get_bushandle(sc->mem);
sc->irq_rid = 0;
+ if ((result = pci_msi_count(dev)) == 1 &&
+ pci_alloc_msi(dev, &result) == 0)
+ sc->irq_rid = 1;
sc->irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &sc->irq_rid,
RF_ACTIVE | RF_SHAREABLE);
if (sc->irq == NULL) {
@@ -487,6 +490,8 @@ iwn_cleanup(device_t dev)
if (sc->irq != NULL) {
bus_teardown_intr(dev, sc->irq, sc->sc_ih);
bus_release_resource(dev, SYS_RES_IRQ, sc->irq_rid, sc->irq);
+ if (sc->irq_rid == 1)
+ pci_release_msi(dev);
}
if (sc->mem != NULL)
bus_release_resource(dev, SYS_RES_MEMORY, sc->mem_rid, sc->mem);