drivers/pci/pci_sandbox.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (c) 2014 Google, Inc
   4  * Written by Simon Glass <sjg@chromium.org>
   5  */
   6
   7 #include <common.h>
   8 #include <dm.h>
   9 #include <fdtdec.h>
  10 #include <pci.h>
  11
  12 #define FDT_DEV_INFO_CELLS      4
  13 #define FDT_DEV_INFO_SIZE       (FDT_DEV_INFO_CELLS * sizeof(u32))
  14
  15 #define SANDBOX_PCI_DEVFN(d, f) ((d << 3) | f)
  16
  17 struct sandbox_pci_priv {
  18         struct {
  19                 u16 vendor;
  20                 u16 device;
  21         } vendev[256];
  22 };
  23
  24 static int sandbox_pci_write_config(struct udevice *bus, pci_dev_t devfn,
  25                                     uint offset, ulong value,
  26                                     enum pci_size_t size)
  27 {
  28         struct dm_pci_emul_ops *ops;
  29         struct udevice *container, *emul;
  30         int ret;
  31
  32         ret = sandbox_pci_get_emul(bus, devfn, &container, &emul);
  33         if (ret)
  34                 return ret == -ENODEV ? 0 : ret;
  35         ops = pci_get_emul_ops(emul);
  36         if (!ops || !ops->write_config)
  37                 return -ENOSYS;
  38
  39         return ops->write_config(emul, offset, value, size);
  40 }
  41
  42 static int sandbox_pci_read_config(const struct udevice *bus, pci_dev_t devfn,
  43                                    uint offset, ulong *valuep,
  44                                    enum pci_size_t size)
  45 {
  46         struct dm_pci_emul_ops *ops;
  47         struct udevice *container, *emul;
  48         struct sandbox_pci_priv *priv = dev_get_priv(bus);
  49         int ret;
  50
  51         /* Prepare the default response */
  52         *valuep = pci_get_ff(size);
  53         ret = sandbox_pci_get_emul(bus, devfn, &container, &emul);
  54         if (ret) {
  55                 if (!container) {
  56                         u16 vendor, device;
  57
  58                         devfn = SANDBOX_PCI_DEVFN(PCI_DEV(devfn),
  59                                                   PCI_FUNC(devfn));
  60                         vendor = priv->vendev[devfn].vendor;
  61                         device = priv->vendev[devfn].device;
  62                         if (offset == PCI_VENDOR_ID && vendor)
  63                                 *valuep = vendor;
  64                         else if (offset == PCI_DEVICE_ID && device)
  65                                 *valuep = device;
  66
  67                         return 0;
  68                 } else {
  69                         return ret == -ENODEV ? 0 : ret;
  70                 }
  71         }
  72         ops = pci_get_emul_ops(emul);
  73         if (!ops || !ops->read_config)
  74                 return -ENOSYS;
  75
  76         return ops->read_config(emul, offset, valuep, size);
  77 }
  78
  79 static int sandbox_pci_probe(struct udevice *dev)
  80 {
  81         struct sandbox_pci_priv *priv = dev_get_priv(dev);
  82         const fdt32_t *cell;
  83         u8 pdev, pfn, devfn;
  84         int len;
  85
  86         cell = ofnode_get_property(dev_ofnode(dev), "sandbox,dev-info", &len);
  87         if (!cell)
  88                 return 0;
  89
  90         if ((len % FDT_DEV_INFO_SIZE) == 0) {
  91                 int num = len / FDT_DEV_INFO_SIZE;
  92                 int i;
  93
  94                 for (i = 0; i < num; i++) {
  95                         debug("dev info #%d: %02x %02x %04x %04x\n", i,
  96                               fdt32_to_cpu(cell[0]), fdt32_to_cpu(cell[1]),
  97                               fdt32_to_cpu(cell[2]), fdt32_to_cpu(cell[3]));
  98
  99                         pdev = fdt32_to_cpu(cell[0]);
 100                         pfn = fdt32_to_cpu(cell[1]);
 101                         if (pdev > 31 || pfn > 7)
 102                                 continue;
 103                         devfn = SANDBOX_PCI_DEVFN(pdev, pfn);
 104                         priv->vendev[devfn].vendor = fdt32_to_cpu(cell[2]);
 105                         priv->vendev[devfn].device = fdt32_to_cpu(cell[3]);
 106
 107                         cell += FDT_DEV_INFO_CELLS;
 108                 }
 109         }
 110
 111         return 0;
 112 }
 113
 114 static const struct dm_pci_ops sandbox_pci_ops = {
 115         .read_config = sandbox_pci_read_config,
 116         .write_config = sandbox_pci_write_config,
 117 };
 118
 119 static const struct udevice_id sandbox_pci_ids[] = {
 120         { .compatible = "sandbox,pci" },
 121         { }
 122 };
 123
 124 U_BOOT_DRIVER(pci_sandbox) = {
 125         .name   = "pci_sandbox",
 126         .id     = UCLASS_PCI,
 127         .of_match = sandbox_pci_ids,
 128         .ops    = &sandbox_pci_ops,
 129         .probe  = sandbox_pci_probe,
 130         .priv_auto_alloc_size = sizeof(struct sandbox_pci_priv),
 131
 132         /* Attach an emulator if we can */
 133         .child_post_bind = dm_scan_fdt_dev,
 134         .per_child_platdata_auto_alloc_size =
 135                         sizeof(struct pci_child_platdata),
 136 };