1 /* 2 * Copyright (c) 2014 Google, Inc 3 * Written by Simon Glass <sjg@chromium.org> 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 #include <common.h> 9 #include <dm.h> 10 #include <fdtdec.h> 11 #include <inttypes.h> 12 #include <pci.h> 13 14 DECLARE_GLOBAL_DATA_PTR; 15 16 static int sandbox_pci_write_config(struct udevice *bus, pci_dev_t devfn, 17 uint offset, ulong value, 18 enum pci_size_t size) 19 { 20 struct dm_pci_emul_ops *ops; 21 struct udevice *emul; 22 int ret; 23 24 ret = sandbox_pci_get_emul(bus, devfn, &emul); 25 if (ret) 26 return ret == -ENODEV ? 0 : ret; 27 ops = pci_get_emul_ops(emul); 28 if (!ops || !ops->write_config) 29 return -ENOSYS; 30 31 return ops->write_config(emul, offset, value, size); 32 } 33 34 static int sandbox_pci_read_config(struct udevice *bus, pci_dev_t devfn, 35 uint offset, ulong *valuep, 36 enum pci_size_t size) 37 { 38 struct dm_pci_emul_ops *ops; 39 struct udevice *emul; 40 int ret; 41 42 /* Prepare the default response */ 43 *valuep = pci_get_ff(size); 44 ret = sandbox_pci_get_emul(bus, devfn, &emul); 45 if (ret) 46 return ret == -ENODEV ? 0 : ret; 47 ops = pci_get_emul_ops(emul); 48 if (!ops || !ops->read_config) 49 return -ENOSYS; 50 51 return ops->read_config(emul, offset, valuep, size); 52 } 53 54 static int sandbox_pci_child_post_bind(struct udevice *dev) 55 { 56 /* Attach an emulator if we can */ 57 return dm_scan_fdt_dev(dev); 58 } 59 60 static const struct dm_pci_ops sandbox_pci_ops = { 61 .read_config = sandbox_pci_read_config, 62 .write_config = sandbox_pci_write_config, 63 }; 64 65 static const struct udevice_id sandbox_pci_ids[] = { 66 { .compatible = "sandbox,pci" }, 67 { } 68 }; 69 70 U_BOOT_DRIVER(pci_sandbox) = { 71 .name = "pci_sandbox", 72 .id = UCLASS_PCI, 73 .of_match = sandbox_pci_ids, 74 .ops = &sandbox_pci_ops, 75 .child_post_bind = sandbox_pci_child_post_bind, 76 .per_child_platdata_auto_alloc_size = 77 sizeof(struct pci_child_platdata), 78 }; 79