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 <inttypes.h> 11 #include <pci.h> 12 13 static int sandbox_pci_write_config(struct udevice *bus, pci_dev_t devfn, 14 uint offset, ulong value, 15 enum pci_size_t size) 16 { 17 struct dm_pci_emul_ops *ops; 18 struct udevice *emul; 19 int ret; 20 21 ret = sandbox_pci_get_emul(bus, devfn, &emul); 22 if (ret) 23 return ret == -ENODEV ? 0 : ret; 24 ops = pci_get_emul_ops(emul); 25 if (!ops || !ops->write_config) 26 return -ENOSYS; 27 28 return ops->write_config(emul, offset, value, size); 29 } 30 31 static int sandbox_pci_read_config(struct udevice *bus, pci_dev_t devfn, 32 uint offset, ulong *valuep, 33 enum pci_size_t size) 34 { 35 struct dm_pci_emul_ops *ops; 36 struct udevice *emul; 37 int ret; 38 39 /* Prepare the default response */ 40 *valuep = pci_get_ff(size); 41 ret = sandbox_pci_get_emul(bus, devfn, &emul); 42 if (ret) 43 return ret == -ENODEV ? 0 : ret; 44 ops = pci_get_emul_ops(emul); 45 if (!ops || !ops->read_config) 46 return -ENOSYS; 47 48 return ops->read_config(emul, offset, valuep, size); 49 } 50 51 static const struct dm_pci_ops sandbox_pci_ops = { 52 .read_config = sandbox_pci_read_config, 53 .write_config = sandbox_pci_write_config, 54 }; 55 56 static const struct udevice_id sandbox_pci_ids[] = { 57 { .compatible = "sandbox,pci" }, 58 { } 59 }; 60 61 U_BOOT_DRIVER(pci_sandbox) = { 62 .name = "pci_sandbox", 63 .id = UCLASS_PCI, 64 .of_match = sandbox_pci_ids, 65 .ops = &sandbox_pci_ops, 66 67 /* Attach an emulator if we can */ 68 .child_post_bind = dm_scan_fdt_dev, 69 .per_child_platdata_auto_alloc_size = 70 sizeof(struct pci_child_platdata), 71 }; 72