> Without this patch, taken from a Suse 2.6.22 kernel, the Pegasos
> PPC machines can't use their IDE interface. Is this the right fix?
>
> Bug:
>
https://bugzilla.redhat.com/show_bug.cgi?id=247602
> Patch (also below):
>
https://bugzilla.redhat.com/attachment.cgi?id=167747
>
> ===============
>
> The built-in IDE controller is configured in legacy mode,
> but the PCI registers advertise native mode.
> Force the PCI class into legacy mode. This allows pata_via to access
> two drives.
> The Pegasos specific irq enforcement in the via82cxxx driver
> must stay because there is aparently no generic way to setup irq per channel.
>
> Tested on Pegasos2 with firmware version 20040810, and two IDE disks.
>
> ---
> arch/powerpc/kernel/prom_init.c | 11 ++++++++---
> arch/powerpc/platforms/chrp/pci.c | 29 +++++++++++++++++++++++++++++
> 2 files changed, 37 insertions(+), 3 deletions(-)
>
> --- a/arch/powerpc/kernel/prom_init.c
> +++ b/arch/powerpc/kernel/prom_init.c
> @@ -2044,6 +2044,7 @@ static void __init fixup_device_tree_map
> /*
> * Pegasos and BriQ lacks the "ranges" property in the isa node
> * Pegasos needs decimal IRQ 14/15, not hexadecimal
> + * Pegasos has the IDE configured in legacy mode, but advertised as native
> */
> static void __init fixup_device_tree_chrp(void)
> {
> @@ -2081,9 +2082,13 @@ static void __init fixup_device_tree_chr
> prom_printf("Fixing up IDE interrupt on Pegasos...\n");
> prop[0] = 14;
> prop[1] = 0x0;
> - prop[2] = 15;
> - prop[3] = 0x0;
> - prom_setprop(ph, name, "interrupts", prop, 4*sizeof(u32));
> + prom_setprop(ph, name, "interrupts", prop, 2*sizeof(u32));
> + prom_printf("Fixing up IDE class-code on Pegasos...\n");
> + rc = prom_getprop(ph, "class-code", prop, sizeof(u32));
> + if (rc == sizeof(u32)) {
> + prop[0] &= ~0x5;
> + prom_setprop(ph, name, "class-code", prop, sizeof(u32));
> + }
> }
> }
> #else
> --- a/arch/powerpc/platforms/chrp/pci.c
> +++ b/arch/powerpc/platforms/chrp/pci.c
> @@ -338,3 +338,32 @@ void chrp_pci_fixup_winbond_ata(struct p
> }
> DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_WINBOND, PCI_DEVICE_ID_WINBOND_82C105,
> chrp_pci_fixup_winbond_ata);
> +
> +/* Pegasos2 firmware version 20040810 configures the built-in IDE controller
> + * in legacy mode, but sets the PCI registers to PCI native mode.
> + * The chip can only operate in legacy mode, so force the PCI class into legacy
> + * mode as well. The same fixup must be done to the class-code property in
> + * the IDE node /pci@80000000/ide@C,1
> + */
> +static void chrp_pci_fixup_vt8231_ata(struct pci_dev *viaide)
> +{
> + u8 progif;
> + struct pci_dev *viaisa;
> +
> + if (!machine_is(chrp) || _chrp_type != _CHRP_Pegasos)
> + return;
> + if (viaide->irq != 14)
> + return;
> +
> + viaisa = pci_get_device(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8231, NULL);
> + if (!viaisa)
> + return;
> + printk("Fixing VIA IDE, force legacy mode on '%s'\n", viaide->dev.bus_id);
> +
> + pci_read_config_byte(viaide, PCI_CLASS_PROG, &progif);
> + pci_write_config_byte(viaide, PCI_CLASS_PROG, progif & ~0x5);
> + viaide->class &= ~0x5;
> +
> + pci_dev_put(viaisa);
> +}
> +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_1, chrp_pci_fixup_vt8231_ata);
> -
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