1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Gemini 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#include <asm/system_misc.h>
12#include <asm/proc-fns.h>
13
14#ifdef CONFIG_DEBUG_GEMINI
15/* This is needed for LL-debug/earlyprintk/debug-macro.S */
16static struct map_desc gemini_io_desc[] __initdata = {
17	{
18		.virtual = CONFIG_DEBUG_UART_VIRT,
19		.pfn = __phys_to_pfn(CONFIG_DEBUG_UART_PHYS),
20		.length = SZ_4K,
21		.type = MT_DEVICE,
22	},
23};
24
25static void __init gemini_map_io(void)
26{
27	iotable_init(gemini_io_desc, ARRAY_SIZE(gemini_io_desc));
28}
29#else
30#define gemini_map_io NULL
31#endif
32
33static void gemini_idle(void)
34{
35	/*
36	 * Because of broken hardware we have to enable interrupts or the CPU
37	 * will never wakeup... Acctualy it is not very good to enable
38	 * interrupts first since scheduler can miss a tick, but there is
39	 * no other way around this. Platforms that needs it for power saving
40	 * should enable it in init code, since by default it is
41	 * disabled.
42	 */
43
44	/* FIXME: Enabling interrupts here is racy! */
45	raw_local_irq_enable();
46	cpu_do_idle();
47	raw_local_irq_disable();
48}
49
50static void __init gemini_init_machine(void)
51{
52	arm_pm_idle = gemini_idle;
53}
54
55static const char *gemini_board_compat[] = {
56	"cortina,gemini",
57	NULL,
58};
59
60DT_MACHINE_START(GEMINI_DT, "Gemini (Device Tree)")
61	.map_io		= gemini_map_io,
62	.init_machine	= gemini_init_machine,
63	.dt_compat	= gemini_board_compat,
64MACHINE_END
65