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// SPDX-License-Identifier: GPL-2.0
#include <linux/reboot.h>
#include <linux/serial_core.h>
#include <linux/random.h>
#include <clocksource/timer-goldfish.h>
#include <asm/bootinfo.h>
#include <asm/bootinfo-virt.h>
#include <asm/byteorder.h>
#include <asm/machdep.h>
#include <asm/virt.h>
#include <asm/config.h>
struct virt_booter_data virt_bi_data;
#define VIRT_CTRL_REG_FEATURES 0x00
#define VIRT_CTRL_REG_CMD 0x04
static struct resource ctrlres;
enum {
CMD_NOOP,
CMD_RESET,
CMD_HALT,
CMD_PANIC,
};
static void virt_get_model(char *str)
{
/* str is 80 characters long */
sprintf(str, "QEMU Virtual M68K Machine (%u.%u.%u)",
(u8)(virt_bi_data.qemu_version >> 24),
(u8)(virt_bi_data.qemu_version >> 16),
(u8)(virt_bi_data.qemu_version >> 8));
}
static void virt_halt(void)
{
void __iomem *base = (void __iomem *)virt_bi_data.ctrl.mmio;
iowrite32be(CMD_HALT, base + VIRT_CTRL_REG_CMD);
local_irq_disable();
while (1)
;
}
static void virt_reset(void)
{
void __iomem *base = (void __iomem *)virt_bi_data.ctrl.mmio;
iowrite32be(CMD_RESET, base + VIRT_CTRL_REG_CMD);
local_irq_disable();
while (1)
;
}
/*
* Parse a virtual-m68k-specific record in the bootinfo
*/
int __init virt_parse_bootinfo(const struct bi_record *record)
{
int unknown = 0;
const void *data = record->data;
switch (be16_to_cpu(record->tag)) {
case BI_VIRT_QEMU_VERSION:
virt_bi_data.qemu_version = be32_to_cpup(data);
break;
case BI_VIRT_GF_PIC_BASE:
virt_bi_data.pic.mmio = be32_to_cpup(data);
data += 4;
virt_bi_data.pic.irq = be32_to_cpup(data);
break;
case BI_VIRT_GF_RTC_BASE:
virt_bi_data.rtc.mmio = be32_to_cpup(data);
data += 4;
virt_bi_data.rtc.irq = be32_to_cpup(data);
break;
case BI_VIRT_GF_TTY_BASE:
virt_bi_data.tty.mmio = be32_to_cpup(data);
data += 4;
virt_bi_data.tty.irq = be32_to_cpup(data);
break;
case BI_VIRT_CTRL_BASE:
virt_bi_data.ctrl.mmio = be32_to_cpup(data);
data += 4;
virt_bi_data.ctrl.irq = be32_to_cpup(data);
break;
case BI_VIRT_VIRTIO_BASE:
virt_bi_data.virtio.mmio = be32_to_cpup(data);
data += 4;
virt_bi_data.virtio.irq = be32_to_cpup(data);
break;
case BI_VIRT_RNG_SEED: {
u16 len = be16_to_cpup(data);
add_bootloader_randomness(data + 2, len);
/*
* Zero the data to preserve forward secrecy, and zero the
* length to prevent kexec from using it.
*/
memzero_explicit((void *)data, len + 2);
break;
}
default:
unknown = 1;
break;
}
return unknown;
}
static void __init virt_sched_init(void)
{
goldfish_timer_init(virt_bi_data.rtc.irq,
(void __iomem *)virt_bi_data.rtc.mmio);
}
void __init config_virt(void)
{
char earlycon[24];
snprintf(earlycon, sizeof(earlycon), "early_gf_tty,0x%08x",
virt_bi_data.tty.mmio);
setup_earlycon(earlycon);
ctrlres = (struct resource)
DEFINE_RES_MEM_NAMED(virt_bi_data.ctrl.mmio, 0x100,
"virtctrl");
if (request_resource(&iomem_resource, &ctrlres)) {
pr_err("Cannot allocate virt controller resource\n");
return;
}
mach_init_IRQ = virt_init_IRQ;
mach_sched_init = virt_sched_init;
mach_get_model = virt_get_model;
mach_reset = virt_reset;
mach_halt = virt_halt;
register_platform_power_off(virt_halt);
}
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