fsl/pci: The new pci suspend/resume implementation

If we do nothing in suspend/resume, some platform PCIe ip-block
can't guarantee the link back to L0 state from sleep, then, when
we read the EP device will hang. Only we send pme turnoff message
in pci controller suspend, and send pme exit message in resume, the
link state will be normal.

When we send pme turnoff message in pci controller suspend, the
links will into l2/l3 ready, then, host cannot communicate with
ep device, but pci-driver will call back EP device to save them
state. So we need to change platform_driver->suspend/resume to
syscore->suspend/resume.

So the new suspend/resume implementation, send pme turnoff message
in suspend, and send pme exit message in resume. And add a PME handler,
to response PME & message interrupt.

Change platform_driver->suspend/resume to syscore->suspend/resume.
pci-driver will call back EP device, to save EP state in
pci_pm_suspend_noirq, so we need to keep the link, until
pci_pm_suspend_noirq finish.

Signed-off-by: Wang Dongsheng <dongsheng.wang@freescale.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/arch/powerpc/sysdev/fsl_pci.h b/arch/powerpc/sysdev/fsl_pci.h
index 8d455df58471..c1cec771d5ea 100644
--- a/arch/powerpc/sysdev/fsl_pci.h
+++ b/arch/powerpc/sysdev/fsl_pci.h
@@ -32,6 +32,13 @@ struct platform_device;
 #define PIWAR_WRITE_SNOOP	0x00005000
 #define PIWAR_SZ_MASK          0x0000003f
 
+#define PEX_PMCR_PTOMR		0x1
+#define PEX_PMCR_EXL2S		0x2
+
+#define PME_DISR_EN_PTOD	0x00008000
+#define PME_DISR_EN_ENL23D	0x00002000
+#define PME_DISR_EN_EXL23D	0x00001000
+
 /* PCI/PCI Express outbound window reg */
 struct pci_outbound_window_regs {
 	__be32	potar;	/* 0x.0 - Outbound translation address register */
@@ -111,6 +118,7 @@ struct ccsr_pci {
 
 extern int fsl_add_bridge(struct platform_device *pdev, int is_primary);
 extern void fsl_pcibios_fixup_bus(struct pci_bus *bus);
+extern void fsl_pcibios_fixup_phb(struct pci_controller *phb);
 extern int mpc83xx_add_bridge(struct device_node *dev);
 u64 fsl_pci_immrbar_base(struct pci_controller *hose);