1// SPDX-License-Identifier: GPL-2.0
2/*
3 * IXP4xx Device Tree boot support
4 */
5#include <linux/kernel.h>
6#include <linux/init.h>
7#include <linux/io.h>
8
9#include <asm/mach/arch.h>
10#include <asm/mach/map.h>
11
12#include <mach/hardware.h>
13#include <mach/ixp4xx-regs.h>
14
15static struct map_desc ixp4xx_of_io_desc[] __initdata = {
16	/*
17	 * This is needed for runtime system configuration checks,
18	 * such as reading if hardware so-and-so is present. This
19	 * could eventually be converted into a syscon once all boards
20	 * are converted to device tree.
21	 */
22	{
23		.virtual = IXP4XX_EXP_CFG_BASE_VIRT,
24		.pfn = __phys_to_pfn(IXP4XX_EXP_CFG_BASE_PHYS),
25		.length = SZ_4K,
26		.type = MT_DEVICE,
27	},
28#ifdef CONFIG_DEBUG_UART_8250
29	/* This is needed for LL-debug/earlyprintk/debug-macro.S */
30	{
31		.virtual = CONFIG_DEBUG_UART_VIRT,
32		.pfn = __phys_to_pfn(CONFIG_DEBUG_UART_PHYS),
33		.length = SZ_4K,
34		.type = MT_DEVICE,
35	},
36#endif
37};
38
39static void __init ixp4xx_of_map_io(void)
40{
41	iotable_init(ixp4xx_of_io_desc, ARRAY_SIZE(ixp4xx_of_io_desc));
42}
43
44/*
45 * We handle 4 differen SoC families. These compatible strings are enough
46 * to provide the core so that different boards can add their more detailed
47 * specifics.
48 */
49static const char *ixp4xx_of_board_compat[] = {
50	"intel,ixp42x",
51	"intel,ixp43x",
52	"intel,ixp45x",
53	"intel,ixp46x",
54	NULL,
55};
56
57DT_MACHINE_START(IXP4XX_DT, "IXP4xx (Device Tree)")
58	.map_io		= ixp4xx_of_map_io,
59	.dt_compat	= ixp4xx_of_board_compat,
60MACHINE_END
61