mirror of
https://github.com/torvalds/linux.git
synced 2024-11-23 04:31:50 +00:00
dc63a086da
This is useful on !virt platforms for kexec, so change things from
BI_VIRT_RNG_SEED to be BI_RNG_SEED, and simply remove BI_VIRT_RNG_SEED
because it only ever lasted one release, and nothing is broken by not
having it. At the same time, keep a comment noting that it's been
removed, so that ID isn't reused. In addition, we previously documented
2-byte alignment, but 4-byte alignment is actually necessary, so update
that comment.
Suggested-by: Geert Uytterhoeven <geert@linux-m68k.org>
Fixes: a1ee38ab1a ("m68k: virt: Use RNG seed from bootinfo block")
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Link: https://lore.kernel.org/r/20220927130835.1629806-2-Jason@zx2c4.com
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
133 lines
2.8 KiB
C
133 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
|
|
#include <linux/reboot.h>
|
|
#include <linux/serial_core.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;
|
|
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);
|
|
}
|