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authorDarren Stevens <darren@stevens-zone.net>2018-08-19 23:21:55 +0300
committerMichael Ellerman <mpe@ellerman.id.au>2018-12-20 14:21:20 +0300
commit68f211a4d1e5882e881bbb84b6505908dde5f625 (patch)
tree1ac33496df5a7c37d83c89eec5b6c46ab1920c56 /arch/powerpc/platforms/pasemi
parent49a502ea23bf9dec47f8f3c3960909ff409cd1bb (diff)
downloadlinux-68f211a4d1e5882e881bbb84b6505908dde5f625.tar.xz
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: Darren Stevens <darren@stevens-zone.net> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/platforms/pasemi')
-rw-r--r--arch/powerpc/platforms/pasemi/pci.c55
1 files changed, 55 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pasemi/pci.c b/arch/powerpc/platforms/pasemi/pci.c
index c3c64172482d..116c0fee6dd0 100644
--- a/arch/powerpc/platforms/pasemi/pci.c
+++ b/arch/powerpc/platforms/pasemi/pci.c
@@ -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)
{