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 <common.h>
9#include <asm/global_data.h>
10#include <dm.h>
11#include <dm/simple_bus.h>
12#include <fdt_support.h>
13
14DECLARE_GLOBAL_DATA_PTR;
15
16fdt_addr_t simple_bus_translate(struct udevice *dev, fdt_addr_t addr)
17{
18	struct simple_bus_plat *plat = dev_get_uclass_plat(dev);
19
20	if (addr >= plat->base && addr < plat->base + plat->size)
21		addr = (addr - plat->base) + plat->target;
22
23	return addr;
24}
25
26static int simple_bus_post_bind(struct udevice *dev)
27{
28#if CONFIG_IS_ENABLED(OF_PLATDATA)
29	return 0;
30#else
31	struct simple_bus_plat *plat = dev_get_uclass_plat(dev);
32	int ret;
33
34	if (CONFIG_IS_ENABLED(SIMPLE_BUS_CORRECT_RANGE)) {
35		uint64_t caddr, paddr, len;
36
37		/* only read range index 0 */
38		ret = fdt_read_range((void *)gd->fdt_blob, dev_of_offset(dev),
39				     0, &caddr, &paddr, &len);
40		if (!ret) {
41			plat->base = caddr;
42			plat->target = paddr;
43			plat->size = len;
44		}
45	} else {
46		u32 cell[3];
47
48		ret = dev_read_u32_array(dev, "ranges", cell,
49					 ARRAY_SIZE(cell));
50		if (!ret) {
51			plat->base = cell[0];
52			plat->target = cell[1];
53			plat->size = cell[2];
54		}
55	}
56
57	return dm_scan_fdt_dev(dev);
58#endif
59}
60
61UCLASS_DRIVER(simple_bus) = {
62	.id		= UCLASS_SIMPLE_BUS,
63	.name		= "simple_bus",
64	.post_bind	= simple_bus_post_bind,
65	.per_device_plat_auto	= sizeof(struct simple_bus_plat),
66};
67
68#if CONFIG_IS_ENABLED(OF_REAL)
69static const struct udevice_id generic_simple_bus_ids[] = {
70	{ .compatible = "simple-bus" },
71	{ .compatible = "simple-mfd" },
72	{ }
73};
74#endif
75
76U_BOOT_DRIVER(simple_bus) = {
77	.name	= "simple_bus",
78	.id	= UCLASS_SIMPLE_BUS,
79	.of_match = of_match_ptr(generic_simple_bus_ids),
80	.flags	= DM_FLAG_PRE_RELOC,
81};
82