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Check PCIE link status before accessing the bus.

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Some 88F5182-based systems (Linkstation) have problems when PCIE is
accessed without any peripherals present.
This commit is contained in:
Rafal Jaworowski 2009-01-09 12:38:41 +00:00
parent 990eddd5b7
commit 4e883c81d0
1 changed files with 3 additions and 0 deletions
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3
sys/arm/mv/mv_pci.c
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@ -80,6 +80,7 @@ __FBSDID("$FreeBSD$");
#define PCIE_REG_STATUS 0x1A04
#define PCIE_REG_IRQ_MASK 0x1910
#define STATUS_LINK_DOWN 1
#define STATUS_BUS_OFFS 8
#define STATUS_BUS_MASK (0xFF << STATUS_BUS_OFFS)
#define STATUS_DEV_OFFS 16
@ -436,6 +437,8 @@ pcib_mbus_probe(device_t self)
P2P_CONF_DEV_OFFS;
} else {
val = bus_space_read_4(sc->sc_bst, sc->sc_bsh, PCIE_REG_STATUS);
if (val & STATUS_LINK_DOWN)
goto out;
bus = sc->sc_busnr = (val & STATUS_BUS_MASK) >> STATUS_BUS_OFFS;
dev = sc->sc_devnr = (val & STATUS_DEV_MASK) >> STATUS_DEV_OFFS;
}