Commit 812fd1fd authored by Michael Ellerman's avatar Michael Ellerman Committed by Paul Mackerras
Browse files

[POWERPC] Enable MSI mappings for MPIC 



On some Apple machines the HT MSI mappings are not enabled by firmware, so
we need to do it by hand.

We can't use the pci routines as this code runs too early.

Signed-off-by: default avatarMichael Ellerman <michael@ellerman.id.au>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent 014dad90

arch/powerpc/sysdev/mpic.c

+45 −0
Original line number Diff line number Diff line
@@ -389,6 +389,50 @@ static void mpic_shutdown_ht_interrupt(struct mpic *mpic, unsigned int source, 
#endif

}



#ifdef CONFIG_PCI_MSI

static void __init mpic_scan_ht_msi(struct mpic *mpic, u8 __iomem *devbase,

				    unsigned int devfn)

{

	u8 __iomem *base;

	u8 pos, flags;

	u64 addr = 0;



	for (pos = readb(devbase + PCI_CAPABILITY_LIST); pos != 0;

	     pos = readb(devbase + pos + PCI_CAP_LIST_NEXT)) {

		u8 id = readb(devbase + pos + PCI_CAP_LIST_ID);

		if (id == PCI_CAP_ID_HT) {

			id = readb(devbase + pos + 3);

			if ((id & HT_5BIT_CAP_MASK) == HT_CAPTYPE_MSI_MAPPING)

				break;

		}

	}



	if (pos == 0)

		return;



	base = devbase + pos;



	flags = readb(base + HT_MSI_FLAGS);

	if (!(flags & HT_MSI_FLAGS_FIXED)) {

		addr = readl(base + HT_MSI_ADDR_LO) & HT_MSI_ADDR_LO_MASK;

		addr = addr | ((u64)readl(base + HT_MSI_ADDR_HI) << 32);

	}



	printk(KERN_DEBUG "mpic:   - HT:%02x.%x %s MSI mapping found @ 0x%lx\n",

		PCI_SLOT(devfn), PCI_FUNC(devfn),

		flags & HT_MSI_FLAGS_ENABLE ? "enabled" : "disabled", addr);



	if (!(flags & HT_MSI_FLAGS_ENABLE))

		writeb(flags | HT_MSI_FLAGS_ENABLE, base + HT_MSI_FLAGS);

}

#else

static void __init mpic_scan_ht_msi(struct mpic *mpic, u8 __iomem *devbase,

				    unsigned int devfn)

{

	return;

}

#endif



static void __init mpic_scan_ht_pic(struct mpic *mpic, u8 __iomem *devbase,

				    unsigned int devfn, u32 vdid)

{
@@ -480,6 +524,7 @@ static void __init mpic_scan_ht_pics(struct mpic *mpic) 
			goto next;



		mpic_scan_ht_pic(mpic, devbase, devfn, l);

		mpic_scan_ht_msi(mpic, devbase, devfn);



	next:

		/* next device, if function 0 */

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