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dm: pci: Support selected device/driver binding before relocation
On some platforms pci devices behind bridge need to be probed (eg: a pci uart on recent x86 chipset) before relocation. But we won't bind all devices found during the enumeration. Only devices whose driver with DM_FLAG_PRE_RELOC set will be bound. Any other generic devices except bridges won't be bound. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Acked-by: Simon Glass <sjg@chromium.org>
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1 changed files with 30 additions and 11 deletions
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@ -461,6 +461,7 @@ static int pci_find_and_bind_driver(struct udevice *parent,
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int n_ents;
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int ret;
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char name[30], *str;
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bool bridge;
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*devp = NULL;
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@ -480,6 +481,17 @@ static int pci_find_and_bind_driver(struct udevice *parent,
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continue;
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drv = entry->driver;
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/*
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* In the pre-relocation phase, we only bind devices
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* whose driver has the DM_FLAG_PRE_RELOC set, to save
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* precious memory space as on some platforms as that
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* space is pretty limited (ie: using Cache As RAM).
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*/
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if (!(gd->flags & GD_FLG_RELOC) &&
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!(drv->flags & DM_FLAG_PRE_RELOC))
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return 0;
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/*
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* We could pass the descriptor to the driver as
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* platdata (instead of NULL) and allow its bind()
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@ -499,14 +511,23 @@ static int pci_find_and_bind_driver(struct udevice *parent,
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}
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}
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bridge = (find_id->class >> 8) == PCI_CLASS_BRIDGE_PCI;
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/*
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* In the pre-relocation phase, we only bind bridge devices to save
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* precious memory space as on some platforms as that space is pretty
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* limited (ie: using Cache As RAM).
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*/
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if (!(gd->flags & GD_FLG_RELOC) && !bridge)
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return 0;
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/* Bind a generic driver so that the device can be used */
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sprintf(name, "pci_%x:%x.%x", parent->seq, PCI_DEV(bdf),
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PCI_FUNC(bdf));
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str = strdup(name);
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if (!str)
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return -ENOMEM;
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drv = (find_id->class >> 8) == PCI_CLASS_BRIDGE_PCI ? "pci_bridge_drv" :
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"pci_generic_drv";
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drv = bridge ? "pci_bridge_drv" : "pci_generic_drv";
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ret = device_bind_driver(parent, drv, str, devp);
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if (ret) {
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debug("%s: Failed to bind generic driver: %d", __func__, ret);
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@ -589,11 +610,13 @@ int pci_bind_bus_devices(struct udevice *bus)
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return ret;
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/* Update the platform data */
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pplat = dev_get_parent_platdata(dev);
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pplat->devfn = PCI_MASK_BUS(bdf);
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pplat->vendor = vendor;
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pplat->device = device;
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pplat->class = class;
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if (dev) {
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pplat = dev_get_parent_platdata(dev);
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pplat->devfn = PCI_MASK_BUS(bdf);
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pplat->vendor = vendor;
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pplat->device = device;
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pplat->class = class;
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}
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}
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return 0;
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@ -717,10 +740,6 @@ static int pci_uclass_post_probe(struct udevice *bus)
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{
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int ret;
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/* Don't scan buses before relocation */
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if (!(gd->flags & GD_FLG_RELOC))
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return 0;
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debug("%s: probing bus %d\n", __func__, bus->seq);
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ret = pci_bind_bus_devices(bus);
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if (ret)
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