1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (c) 2014 Google, Inc
4 */
5
6 #include <common.h>
7 #include <dm.h>
8
9 struct simple_bus_plat {
10 u32 base;
11 u32 size;
12 u32 target;
13 };
14
simple_bus_translate(struct udevice * dev,fdt_addr_t addr)15 fdt_addr_t simple_bus_translate(struct udevice *dev, fdt_addr_t addr)
16 {
17 struct simple_bus_plat *plat = dev_get_uclass_platdata(dev);
18
19 if (addr >= plat->base && addr < plat->base + plat->size)
20 addr = (addr - plat->base) + plat->target;
21
22 return addr;
23 }
24
simple_bus_post_bind(struct udevice * dev)25 static int simple_bus_post_bind(struct udevice *dev)
26 {
27 #if CONFIG_IS_ENABLED(OF_PLATDATA)
28 return 0;
29 #else
30 u32 cell[3];
31 int ret;
32
33 ret = dev_read_u32_array(dev, "ranges", cell, ARRAY_SIZE(cell));
34 if (!ret) {
35 struct simple_bus_plat *plat = dev_get_uclass_platdata(dev);
36
37 plat->base = cell[0];
38 plat->target = cell[1];
39 plat->size = cell[2];
40 }
41
42 return dm_scan_fdt_dev(dev);
43 #endif
44 }
45
46 UCLASS_DRIVER(simple_bus) = {
47 .id = UCLASS_SIMPLE_BUS,
48 .name = "simple_bus",
49 .post_bind = simple_bus_post_bind,
50 .per_device_platdata_auto_alloc_size = sizeof(struct simple_bus_plat),
51 };
52
53 static const struct udevice_id generic_simple_bus_ids[] = {
54 { .compatible = "simple-bus" },
55 { .compatible = "simple-mfd" },
56 { }
57 };
58
59 U_BOOT_DRIVER(simple_bus_drv) = {
60 .name = "generic_simple_bus",
61 .id = UCLASS_SIMPLE_BUS,
62 .of_match = generic_simple_bus_ids,
63 };
64