Hi,
this issue was brought up before.
See this thread:
https://lists.ozlabs.org/pipermail/linuxppc-dev/2012-July/099529.html
The following patch works for me.
Hot-added devices appear after "echo 1 > /sys/bus/pci/rescan".
I tested it with a P5020DS development system.
Signed-off-by: Rojhalat Ibrahim <i...@rtschenk.de>
---
arch/powerpc/sysdev/indirect_pci.c | 53 ++++++++++++++++++++++++++++++-------
1 file changed, 44 insertions(+), 9 deletions(-)
diff --git a/arch/powerpc/sysdev/indirect_pci.c
b/arch/powerpc/sysdev/indirect_pci.c
index 82fdad8..aa36009 100644
--- a/arch/powerpc/sysdev/indirect_pci.c
+++ b/arch/powerpc/sysdev/indirect_pci.c
@@ -20,22 +20,19 @@
#include <asm/pci-bridge.h>
#include <asm/machdep.h>
+#ifdef CONFIG_FSL_PCI
+#include <sysdev/fsl_pci.h>
+#endif
+
static int
-indirect_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
- int len, u32 *val)
+read_config_no_link_check(struct pci_bus *bus, unsigned int devfn, int offset,
+ int len, u32 *val)
{
struct pci_controller *hose = pci_bus_to_host(bus);
volatile void __iomem *cfg_data;
u8 cfg_type = 0;
u32 bus_no, reg;
- if (hose->indirect_type & PPC_INDIRECT_TYPE_NO_PCIE_LINK) {
- if (bus->number != hose->first_busno)
- return PCIBIOS_DEVICE_NOT_FOUND;
- if (devfn != 0)
- return PCIBIOS_DEVICE_NOT_FOUND;
- }
-
if (ppc_md.pci_exclude_device)
if (ppc_md.pci_exclude_device(hose, bus->number, devfn))
return PCIBIOS_DEVICE_NOT_FOUND;
@@ -78,6 +75,44 @@ indirect_read_config(struct pci_bus *bus, unsigned int
devfn, int offset,
return PCIBIOS_SUCCESSFUL;
}
+#ifdef CONFIG_FSL_PCI
+static int fsl_pcie_check_link(struct pci_bus *bus)
+{
+ struct pci_controller *hose = pci_bus_to_host(bus);
+ u32 val = 0;
+
+ read_config_no_link_check(bus, 0, PCIE_LTSSM, 4, &val);
+ if (val < PCIE_LTSSM_L0) {
+ hose->indirect_type |= PPC_INDIRECT_TYPE_NO_PCIE_LINK;
+ return 1;
+ } else {
+ hose->indirect_type &= ~PPC_INDIRECT_TYPE_NO_PCIE_LINK;
+ return 0;
+ }
+}
+#endif
+
+static int
+indirect_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
+ int len, u32 *val)
+{
+ struct pci_controller *hose = pci_bus_to_host(bus);
+
+#ifdef CONFIG_FSL_PCI
+ if ((bus->number == hose->first_busno) && (devfn == 0)) {
+ fsl_pcie_check_link(bus);
+ }
+#endif
+ if (hose->indirect_type & PPC_INDIRECT_TYPE_NO_PCIE_LINK) {
+ if (bus->number != hose->first_busno)
+ return PCIBIOS_DEVICE_NOT_FOUND;
+ if (devfn != 0)
+ return PCIBIOS_DEVICE_NOT_FOUND;
+ }
+
+ return read_config_no_link_check(bus, devfn, offset, len, val);
+}
+
static int
indirect_write_config(struct pci_bus *bus, unsigned int devfn, int offset,
int len, u32 val)
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