mirror of
https://github.com/AsahiLinux/u-boot
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137 lines
3.2 KiB
C
137 lines
3.2 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 <log.h>
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#include <pci.h>
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#define FDT_DEV_INFO_CELLS 4
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#define FDT_DEV_INFO_SIZE (FDT_DEV_INFO_CELLS * sizeof(u32))
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#define SANDBOX_PCI_DEVFN(d, f) ((d << 3) | f)
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struct sandbox_pci_priv {
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struct {
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u16 vendor;
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u16 device;
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} vendev[256];
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};
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static int sandbox_pci_write_config(struct udevice *bus, pci_dev_t devfn,
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uint offset, ulong value,
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enum pci_size_t size)
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{
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struct dm_pci_emul_ops *ops;
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struct udevice *container, *emul;
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int ret;
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ret = sandbox_pci_get_emul(bus, devfn, &container, &emul);
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if (ret)
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return ret == -ENODEV ? 0 : ret;
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ops = pci_get_emul_ops(emul);
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if (!ops || !ops->write_config)
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return -ENOSYS;
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return ops->write_config(emul, offset, value, size);
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}
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static int sandbox_pci_read_config(const struct udevice *bus, pci_dev_t devfn,
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uint offset, ulong *valuep,
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enum pci_size_t size)
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{
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struct dm_pci_emul_ops *ops;
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struct udevice *container, *emul;
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struct sandbox_pci_priv *priv = dev_get_priv(bus);
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int ret;
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/* Prepare the default response */
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*valuep = pci_get_ff(size);
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ret = sandbox_pci_get_emul(bus, devfn, &container, &emul);
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if (ret) {
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if (!container) {
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u16 vendor, device;
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devfn = SANDBOX_PCI_DEVFN(PCI_DEV(devfn),
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PCI_FUNC(devfn));
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vendor = priv->vendev[devfn].vendor;
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device = priv->vendev[devfn].device;
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if (offset == PCI_VENDOR_ID && vendor)
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*valuep = vendor;
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else if (offset == PCI_DEVICE_ID && device)
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*valuep = device;
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return 0;
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} else {
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return ret == -ENODEV ? 0 : ret;
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}
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}
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ops = pci_get_emul_ops(emul);
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if (!ops || !ops->read_config)
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return -ENOSYS;
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return ops->read_config(emul, offset, valuep, size);
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}
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static int sandbox_pci_probe(struct udevice *dev)
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{
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struct sandbox_pci_priv *priv = dev_get_priv(dev);
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const fdt32_t *cell;
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u8 pdev, pfn, devfn;
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int len;
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cell = ofnode_get_property(dev_ofnode(dev), "sandbox,dev-info", &len);
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if (!cell)
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return 0;
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if ((len % FDT_DEV_INFO_SIZE) == 0) {
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int num = len / FDT_DEV_INFO_SIZE;
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int i;
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for (i = 0; i < num; i++) {
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debug("dev info #%d: %02x %02x %04x %04x\n", i,
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fdt32_to_cpu(cell[0]), fdt32_to_cpu(cell[1]),
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fdt32_to_cpu(cell[2]), fdt32_to_cpu(cell[3]));
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pdev = fdt32_to_cpu(cell[0]);
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pfn = fdt32_to_cpu(cell[1]);
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if (pdev > 31 || pfn > 7)
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continue;
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devfn = SANDBOX_PCI_DEVFN(pdev, pfn);
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priv->vendev[devfn].vendor = fdt32_to_cpu(cell[2]);
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priv->vendev[devfn].device = fdt32_to_cpu(cell[3]);
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cell += FDT_DEV_INFO_CELLS;
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}
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}
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return 0;
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}
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static const struct dm_pci_ops sandbox_pci_ops = {
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.read_config = sandbox_pci_read_config,
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.write_config = sandbox_pci_write_config,
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};
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static const struct udevice_id sandbox_pci_ids[] = {
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{ .compatible = "sandbox,pci" },
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{ }
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};
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U_BOOT_DRIVER(pci_sandbox) = {
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.name = "pci_sandbox",
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.id = UCLASS_PCI,
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.of_match = sandbox_pci_ids,
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.ops = &sandbox_pci_ops,
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.probe = sandbox_pci_probe,
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.priv_auto_alloc_size = sizeof(struct sandbox_pci_priv),
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/* Attach an emulator if we can */
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.child_post_bind = dm_scan_fdt_dev,
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.per_child_platdata_auto_alloc_size =
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sizeof(struct pci_child_platdata),
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};
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