mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-29 14:33:08 +00:00
007056f495
Currently, timer driver is bound only for hart0. There is no mandatory requirement that hart0 should always come up. In fact, HiFive Unleashed SoC hart0 doesn't boot in S-mode because it only has M-mode. The timer driver should be bound for boot hart. Signed-off-by: Atish Patra <atish.patra@wdc.com> Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Alexander Graf <agraf@suse.de> Reviewed-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
117 lines
2.5 KiB
C
117 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <cpu.h>
|
|
#include <dm.h>
|
|
#include <errno.h>
|
|
#include <dm/device-internal.h>
|
|
#include <dm/lists.h>
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
static int riscv_cpu_get_desc(struct udevice *dev, char *buf, int size)
|
|
{
|
|
const char *isa;
|
|
|
|
isa = dev_read_string(dev, "riscv,isa");
|
|
if (size < (strlen(isa) + 1))
|
|
return -ENOSPC;
|
|
|
|
strcpy(buf, isa);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int riscv_cpu_get_info(struct udevice *dev, struct cpu_info *info)
|
|
{
|
|
const char *mmu;
|
|
|
|
dev_read_u32(dev, "clock-frequency", (u32 *)&info->cpu_freq);
|
|
|
|
mmu = dev_read_string(dev, "mmu-type");
|
|
if (!mmu)
|
|
info->features |= BIT(CPU_FEAT_MMU);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int riscv_cpu_get_count(struct udevice *dev)
|
|
{
|
|
ofnode node;
|
|
int num = 0;
|
|
|
|
ofnode_for_each_subnode(node, dev_ofnode(dev->parent)) {
|
|
const char *device_type;
|
|
|
|
device_type = ofnode_read_string(node, "device_type");
|
|
if (!device_type)
|
|
continue;
|
|
if (strcmp(device_type, "cpu") == 0)
|
|
num++;
|
|
}
|
|
|
|
return num;
|
|
}
|
|
|
|
static int riscv_cpu_bind(struct udevice *dev)
|
|
{
|
|
struct cpu_platdata *plat = dev_get_parent_platdata(dev);
|
|
struct driver *drv;
|
|
int ret;
|
|
|
|
/* save the hart id */
|
|
plat->cpu_id = dev_read_addr(dev);
|
|
/* first examine the property in current cpu node */
|
|
ret = dev_read_u32(dev, "timebase-frequency", &plat->timebase_freq);
|
|
/* if not found, then look at the parent /cpus node */
|
|
if (ret)
|
|
dev_read_u32(dev->parent, "timebase-frequency",
|
|
&plat->timebase_freq);
|
|
|
|
/*
|
|
* Bind riscv-timer driver on boot hart.
|
|
*
|
|
* We only instantiate one timer device which is enough for U-Boot.
|
|
* Pass the "timebase-frequency" value as the driver data for the
|
|
* timer device.
|
|
*
|
|
* Return value is not checked since it's possible that the timer
|
|
* driver is not included.
|
|
*/
|
|
if (plat->cpu_id == gd->arch.boot_hart && plat->timebase_freq) {
|
|
drv = lists_driver_lookup_name("riscv_timer");
|
|
if (!drv) {
|
|
debug("Cannot find the timer driver, not included?\n");
|
|
return 0;
|
|
}
|
|
|
|
device_bind_with_driver_data(dev, drv, "riscv_timer",
|
|
plat->timebase_freq, ofnode_null(),
|
|
NULL);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct cpu_ops riscv_cpu_ops = {
|
|
.get_desc = riscv_cpu_get_desc,
|
|
.get_info = riscv_cpu_get_info,
|
|
.get_count = riscv_cpu_get_count,
|
|
};
|
|
|
|
static const struct udevice_id riscv_cpu_ids[] = {
|
|
{ .compatible = "riscv" },
|
|
{ }
|
|
};
|
|
|
|
U_BOOT_DRIVER(riscv_cpu) = {
|
|
.name = "riscv_cpu",
|
|
.id = UCLASS_CPU,
|
|
.of_match = riscv_cpu_ids,
|
|
.bind = riscv_cpu_bind,
|
|
.ops = &riscv_cpu_ops,
|
|
.flags = DM_FLAG_PRE_RELOC,
|
|
};
|