1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (c) 2014 Google, Inc
4 */
5
6 #define LOG_CATEGORY UCLASS_SIMPLE_BUS
7
8 #include <asm/global_data.h>
9 #include <dm.h>
10 #include <dm/simple_bus.h>
11 #include <fdt_support.h>
12
13 DECLARE_GLOBAL_DATA_PTR;
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_plat(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 struct simple_bus_plat *plat = dev_get_uclass_plat(dev);
31 int ret;
32
33 if (CONFIG_IS_ENABLED(SIMPLE_BUS_CORRECT_RANGE)) {
34 uint64_t caddr, paddr, len;
35
36 /* only read range index 0 */
37 ret = fdt_read_range((void *)gd->fdt_blob, dev_of_offset(dev),
38 0, &caddr, &paddr, &len);
39 if (!ret) {
40 plat->base = caddr;
41 plat->target = paddr;
42 plat->size = len;
43 }
44 } else {
45 u32 cell[3];
46
47 ret = dev_read_u32_array(dev, "ranges", cell,
48 ARRAY_SIZE(cell));
49 if (!ret) {
50 plat->base = cell[0];
51 plat->target = cell[1];
52 plat->size = cell[2];
53 }
54 }
55
56 return dm_scan_fdt_dev(dev);
57 #endif
58 }
59
60 UCLASS_DRIVER(simple_bus) = {
61 .id = UCLASS_SIMPLE_BUS,
62 .name = "simple_bus",
63 .post_bind = simple_bus_post_bind,
64 .per_device_plat_auto = sizeof(struct simple_bus_plat),
65 };
66
67 #if CONFIG_IS_ENABLED(OF_REAL)
68 static const struct udevice_id generic_simple_bus_ids[] = {
69 { .compatible = "simple-bus" },
70 { .compatible = "simple-mfd" },
71 { }
72 };
73 #endif
74
75 U_BOOT_DRIVER(simple_bus) = {
76 .name = "simple_bus",
77 .id = UCLASS_SIMPLE_BUS,
78 .of_match = of_match_ptr(generic_simple_bus_ids),
79 .flags = DM_FLAG_PRE_RELOC,
80 };
81