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powerpc/powernv: Handle PCI-X/PCIe reset delay

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The firmware doesn't wait after lifting the PCI reset. However it does
timestamp it in the device tree. We use that to ensure we wait long
enough (3s is our current arbitrary setting) from that timestamp to
actually probing the bus.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Benjamin Herrenschmidt 2011-09-19 17:45:07 +00:00
parent c1a2562ac5
commit 82ba129bae
1 changed files with 32 additions and 0 deletions
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32
arch/powerpc/platforms/powernv/pci.c
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@ -35,6 +35,8 @@
#include "powernv.h"
#include "pci.h"
/* Delay in usec */
#define PCI_RESET_DELAY_US 3000000
#define cfg_dbg(fmt...) do { } while(0)
//#define cfg_dbg(fmt...) printk(fmt)
@ -354,6 +356,35 @@ static void __devinit pnv_pci_dma_dev_setup(struct pci_dev *pdev)
pnv_pci_dma_fallback_setup(hose, pdev);
}
static int pnv_pci_probe_mode(struct pci_bus *bus)
{
struct pci_controller *hose = pci_bus_to_host(bus);
const __be64 *tstamp;
u64 now, target;
/* We hijack this as a way to ensure we have waited long
* enough since the reset was lifted on the PCI bus
*/
if (bus != hose->bus)
return PCI_PROBE_NORMAL;
tstamp = of_get_property(hose->dn, "reset-clear-timestamp", NULL);
if (!tstamp || !*tstamp)
return PCI_PROBE_NORMAL;
now = mftb() / tb_ticks_per_usec;
target = (be64_to_cpup(tstamp) / tb_ticks_per_usec)
+ PCI_RESET_DELAY_US;
pr_devel("pci %04d: Reset target: 0x%llx now: 0x%llx\n",
hose->global_number, target, now);
if (now < target)
msleep((target - now + 999) / 1000);
return PCI_PROBE_NORMAL;
}
void __init pnv_pci_init(void)
{
struct device_node *np;
@ -384,6 +415,7 @@ void __init pnv_pci_init(void)
ppc_md.pci_dma_dev_setup = pnv_pci_dma_dev_setup;
ppc_md.tce_build = pnv_tce_build;
ppc_md.tce_free = pnv_tce_free;
ppc_md.pci_probe_mode = pnv_pci_probe_mode;
set_pci_dma_ops(&dma_iommu_ops);
/* Configure MSIs */