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
14 struct virt_booter_data virt_bi_data;
15
16 #define VIRT_CTRL_REG_FEATURES 0x00
17 #define VIRT_CTRL_REG_CMD 0x04
18
19 static struct resource ctrlres;
20
21 enum {
22 CMD_NOOP,
23 CMD_RESET,
24 CMD_HALT,
25 CMD_PANIC,
26 };
27
28 static 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
37 static 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
47 static 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
61 int __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
102 static 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
108 void __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
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