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https://github.com/brain-hackers/u-boot-brain
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be0d8fa452
At present PCI emulation devices are not probed before use, since they used to be children of the device that used them, and children cannot be probed before their parents. Now that PCI emulation devices are attached to the root node, we can simply probe them, and avoid using the internal function. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Tested-by: Bin Meng <bmeng.cn@gmail.com> [bmeng: rebase the patch against u-boot-x86/next to get it applied cleanly] Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
94 lines
2.2 KiB
C
94 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2014 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*/
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#include <common.h>
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#include <dm.h>
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#include <fdtdec.h>
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#include <linux/libfdt.h>
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#include <pci.h>
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#include <dm/lists.h>
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struct sandbox_pci_emul_priv {
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int dev_count;
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};
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int sandbox_pci_get_emul(struct udevice *bus, pci_dev_t find_devfn,
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struct udevice **containerp, struct udevice **emulp)
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{
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struct udevice *dev;
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int ret;
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*containerp = NULL;
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ret = pci_bus_find_devfn(bus, PCI_MASK_BUS(find_devfn), &dev);
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if (ret) {
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debug("%s: Could not find emulator for dev %x\n", __func__,
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find_devfn);
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return ret;
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}
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*containerp = dev;
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/*
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* See commit 4345998ae9df,
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* "pci: sandbox: Support dynamically binding device driver"
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*/
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ret = uclass_get_device_by_phandle(UCLASS_PCI_EMUL, dev, "sandbox,emul",
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emulp);
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if (ret && device_get_uclass_id(dev) != UCLASS_PCI_GENERIC)
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*emulp = dev;
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return *emulp ? 0 : -ENODEV;
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}
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static int sandbox_pci_emul_post_probe(struct udevice *dev)
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{
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struct sandbox_pci_emul_priv *priv = dev->uclass->priv;
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priv->dev_count++;
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sandbox_set_enable_pci_map(true);
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return 0;
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}
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static int sandbox_pci_emul_pre_remove(struct udevice *dev)
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{
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struct sandbox_pci_emul_priv *priv = dev->uclass->priv;
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priv->dev_count--;
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sandbox_set_enable_pci_map(priv->dev_count > 0);
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return 0;
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}
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UCLASS_DRIVER(pci_emul) = {
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.id = UCLASS_PCI_EMUL,
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.name = "pci_emul",
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.post_probe = sandbox_pci_emul_post_probe,
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.pre_remove = sandbox_pci_emul_pre_remove,
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.priv_auto_alloc_size = sizeof(struct sandbox_pci_emul_priv),
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};
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/*
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* This uclass is a child of the pci bus. Its platdata is not defined here so
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* is defined by its parent, UCLASS_PCI, which uses struct pci_child_platdata.
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* See per_child_platdata_auto_alloc_size in UCLASS_DRIVER(pci).
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*/
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UCLASS_DRIVER(pci_emul_parent) = {
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.id = UCLASS_PCI_EMUL_PARENT,
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.name = "pci_emul_parent",
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.post_bind = dm_scan_fdt_dev,
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};
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static const struct udevice_id pci_emul_parent_ids[] = {
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{ .compatible = "sandbox,pci-emul-parent" },
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{ }
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};
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U_BOOT_DRIVER(pci_emul_parent_drv) = {
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.name = "pci_emul_parent_drv",
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.id = UCLASS_PCI_EMUL_PARENT,
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.of_match = pci_emul_parent_ids,
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};
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