1// SPDX-License-Identifier: GPL-2.0
2
3#include <linux/reboot.h>
4#include <linux/serial_core.h>
5#include <clocksource/timer-goldfish.h>
6
7#include <asm/bootinfo.h>
8#include <asm/bootinfo-virt.h>
9#include <asm/byteorder.h>
10#include <asm/machdep.h>
11#include <asm/virt.h>
12#include <asm/config.h>
13
14struct virt_booter_data virt_bi_data;
15
16#define VIRT_CTRL_REG_FEATURES	0x00
17#define VIRT_CTRL_REG_CMD	0x04
18
19static struct resource ctrlres;
20
21enum {
22	CMD_NOOP,
23	CMD_RESET,
24	CMD_HALT,
25	CMD_PANIC,
26};
27
28static void virt_get_model(char *str)
29{
30	/* str is 80 characters long */
31	sprintf(str, "QEMU Virtual M68K Machine (%u.%u.%u)",
32		(u8)(virt_bi_data.qemu_version >> 24),
33		(u8)(virt_bi_data.qemu_version >> 16),
34		(u8)(virt_bi_data.qemu_version >> 8));
35}
36
37static void virt_halt(void)
38{
39	void __iomem *base = (void __iomem *)virt_bi_data.ctrl.mmio;
40
41	iowrite32be(CMD_HALT, base + VIRT_CTRL_REG_CMD);
42	local_irq_disable();
43	while (1)
44		;
45}
46
47static void virt_reset(void)
48{
49	void __iomem *base = (void __iomem *)virt_bi_data.ctrl.mmio;
50
51	iowrite32be(CMD_RESET, base + VIRT_CTRL_REG_CMD);
52	local_irq_disable();
53	while (1)
54		;
55}
56
57/*
58 * Parse a virtual-m68k-specific record in the bootinfo
59 */
60
61int __init virt_parse_bootinfo(const struct bi_record *record)
62{
63	int unknown = 0;
64	const void *data = record->data;
65
66	switch (be16_to_cpu(record->tag)) {
67	case BI_VIRT_QEMU_VERSION:
68		virt_bi_data.qemu_version = be32_to_cpup(data);
69		break;
70	case BI_VIRT_GF_PIC_BASE:
71		virt_bi_data.pic.mmio = be32_to_cpup(data);
72		data += 4;
73		virt_bi_data.pic.irq = be32_to_cpup(data);
74		break;
75	case BI_VIRT_GF_RTC_BASE:
76		virt_bi_data.rtc.mmio = be32_to_cpup(data);
77		data += 4;
78		virt_bi_data.rtc.irq = be32_to_cpup(data);
79		break;
80	case BI_VIRT_GF_TTY_BASE:
81		virt_bi_data.tty.mmio = be32_to_cpup(data);
82		data += 4;
83		virt_bi_data.tty.irq = be32_to_cpup(data);
84		break;
85	case BI_VIRT_CTRL_BASE:
86		virt_bi_data.ctrl.mmio = be32_to_cpup(data);
87		data += 4;
88		virt_bi_data.ctrl.irq = be32_to_cpup(data);
89		break;
90	case BI_VIRT_VIRTIO_BASE:
91		virt_bi_data.virtio.mmio = be32_to_cpup(data);
92		data += 4;
93		virt_bi_data.virtio.irq = be32_to_cpup(data);
94		break;
95	default:
96		unknown = 1;
97		break;
98	}
99	return unknown;
100}
101
102static void __init virt_sched_init(void)
103{
104	goldfish_timer_init(virt_bi_data.rtc.irq,
105			    (void __iomem *)virt_bi_data.rtc.mmio);
106}
107
108void __init config_virt(void)
109{
110	char earlycon[24];
111
112	snprintf(earlycon, sizeof(earlycon), "early_gf_tty,0x%08x",
113		 virt_bi_data.tty.mmio);
114	setup_earlycon(earlycon);
115
116	ctrlres = (struct resource)
117		   DEFINE_RES_MEM_NAMED(virt_bi_data.ctrl.mmio, 0x100,
118					"virtctrl");
119
120	if (request_resource(&iomem_resource, &ctrlres)) {
121		pr_err("Cannot allocate virt controller resource\n");
122		return;
123	}
124
125	mach_init_IRQ = virt_init_IRQ;
126	mach_sched_init = virt_sched_init;
127	mach_get_model = virt_get_model;
128	mach_reset = virt_reset;
129	mach_halt = virt_halt;
130
131	register_platform_power_off(virt_halt);
132}
133