Messages in this thread | | | Date | Thu, 12 Jul 2001 10:07:59 -0400 | From | Jeff Garzik <> | Subject | Re: Cannot access PCI device |
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Zehetbauer Thomas wrote: > > Hi! I am trying to access a custom PCI device on a Walnut Rev. D system > running Hard Hat Linux Rev. 1.2 with Montavista kernel snapshot > 01.04.12. The following code is beeing executed in the probe function of > a kernel module and works well on Linux 2.4.2/Intel but returns useless > values on PowerPC. > > ### begin code ### > unsigned long linux_addr_start, linux_addr_end, val; > u32 config_addr; > > pdev = pci_find_device(0x10ee, 0x4030, pdev); > if (NULL == pdev) > return(-1);
use pci_register_driver or pci_module_init not pci_find_device
> if (pci_enable_device(pdev)) > return(-1); > linux_addr_start = pci_resource_start(pdev, 0); > linux_addr_end = pci_resource_end(pdev, 0); > pci_read_config_dword(pdev, PCI_BASE_ADDRESS_0, &config_addr); > printk("Found %s\n", pdev->name); > printk("pci_resource_start=%lx\n", linux_addr_start); > printk("pci_resource_end=%lx\n", linux_addr_end); > printk("PCI_BASE_ADDRESS_0=%lx\n", config_addr); > IOAddress = ioremap(config_addr, 0xffff);
bug: calling ioremap with config_addr value directly from PCI BAR register. You should mask the value. However, it is irrelevant: linux_addr_start make config_addr unnecessary.
-- Jeff Garzik | A recent study has shown that too much soup Building 1024 | can cause malaise in laboratory mice. MandrakeSoft | - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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