On Saturday 13 October 2007, Alan Cox wrote:
> > Comment in pmac_ide_init_hwif_ports() is highly misleading as this function
> > returns early only for "normal" IDE PCI devices (pmac_ide_init_hwif_ports()
> > can be called outside ide-pmac driver through ppc_ide_md).
>
> Follow the code you pasted
>
> > pmif->regbase = (unsigned long) base + 0x2000;
> > ...
> > rc = pmac_ide_setup_device(pmif, hwif);
>
> Ok so regbase is set
>
> > ...
> > }
> >
> > static int
> > pmac_ide_setup_device(pmac_ide_hwif_t *pmif, ide_hwif_t *hwif)
> > {
> > ...
> > pmac_ide_init_hwif_ports(&hwif->hw, pmif->regbase, 0, &hwif->irq);
>
> Now we pass a honking great zero for the ctrl_port
> > ...
> > }
> >
> > void
> > pmac_ide_init_hwif_ports(hw_regs_t *hw,
> > unsigned long data_port, unsigned long ctrl_port,
> > int *irq)
> > {
> > ...
> > for (ix = 0; ix < MAX_HWIFS; ++ix)
this loop is a tricky part, regbase is set so we break out early
> > if (data_port == pmac_ide[ix].regbase)
> > break;
> > ---> since pmif->regbase was set earlier ix will be < MAX_HWIFS
^^^^^^^^^^^^^^^^^^^^^^
> > if (ix >= MAX_HWIFS) {
^^^^^^^^^^^^^^^
> > /* Probably a PCI interface... */
> > for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; ++i)
> > hw->io_ports[i] = data_port + i - IDE_DATA_OFFSET;
> > hw->io_ports[IDE_CONTROL_OFFSET] = ctrl_port;
>
> Which is zero..
>
>
> See the problem ?
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