Commit 68f211a4 authored by Darren Stevens's avatar Darren Stevens Committed by Michael Ellerman
Browse files

powerpc/pasemi: Add PCI initialisation for Nemo board. 



The A-Eon Amigaone X1000's Nemo motherboard has an AMD SB600
connected to one of the PCI-e root ports on its PaSemi
Pwrficient 1628M SoC. Normally the SB600 southbridge would be
connected to a hidden PCI-e port on the system's northbridge,
and as a result doesn't fully comply with the PCI-e spec.

Add code to relax the PCI-e detection in both the root port
and the Linux kernel allowing on board devices to be detected.

Signed-off-by: default avatarDarren Stevens <darren@stevens-zone.net>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 49a502ea

arch/powerpc/platforms/pasemi/pci.c

+55 −0
Original line number Diff line number Diff line
@@ -108,6 +108,61 @@ static int workaround_5945(struct pci_bus *bus, unsigned int devfn, 
	return 1;

}



#ifdef CONFIG_PPC_PASEMI_NEMO

#define PXP_ERR_CFG_REG	0x4

#define PXP_IGNORE_PCIE_ERRORS	0x800

#define SB600_BUS 5



static void sb600_set_flag(int bus)

{

	static void __iomem *iob_mapbase = NULL;

	struct resource res;

	struct device_node *dn;

	int err;



	if (iob_mapbase == NULL) {

		dn = of_find_compatible_node(NULL, "isa", "pasemi,1682m-iob");

		if (!dn) {

			pr_crit("NEMO SB600 missing iob node\n");

			return;

		}



		err = of_address_to_resource(dn, 0, &res);

		of_node_put(dn);



		if (err) {

			pr_crit("NEMO SB600 missing resource\n");

			return;

		}



		pr_info("NEMO SB600 IOB base %08llx\n",res.start);



		iob_mapbase = ioremap(res.start + 0x100, 0x94);

	}



	if (iob_mapbase != NULL) {

		if (bus == SB600_BUS) {

			/*

			 * This is the SB600's bus, tell the PCI-e root port

			 * to allow non-zero devices to enumerate.

			 */

			out_le32(iob_mapbase + PXP_ERR_CFG_REG, in_le32(iob_mapbase + PXP_ERR_CFG_REG) | PXP_IGNORE_PCIE_ERRORS);

		} else {

			/*

			 * Only scan device 0 on other busses

			 */

			out_le32(iob_mapbase + PXP_ERR_CFG_REG, in_le32(iob_mapbase + PXP_ERR_CFG_REG) & ~PXP_IGNORE_PCIE_ERRORS);

		}

	}

}



#else



static void sb600_set_flag(int bus)

{

}

#endif



static int pa_pxp_read_config(struct pci_bus *bus, unsigned int devfn,

			      int offset, int len, u32 *val)

{

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