mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-30 00:21:06 +00:00
6136a23263
Add basic CPU driver used to retrieve CPU model information. Tested-by: Daniel Golle <daniel@makrotopia.org> Signed-off-by: Weijie Gao <weijie.gao@mediatek.com> Reviewed-by: Simon Glass <sjg@chromium.org>
86 lines
1.7 KiB
C
86 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (C) 2022 MediaTek Inc. All rights reserved.
|
|
*
|
|
* Author: Weijie Gao <weijie.gao@mediatek.com>
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <cpu.h>
|
|
#include <dm.h>
|
|
#include <regmap.h>
|
|
#include <syscon.h>
|
|
#include <asm/global_data.h>
|
|
#include <linux/err.h>
|
|
#include <linux/io.h>
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
struct mtk_cpu_plat {
|
|
struct regmap *hwver;
|
|
};
|
|
|
|
static int mtk_cpu_get_desc(const struct udevice *dev, char *buf, int size)
|
|
{
|
|
struct mtk_cpu_plat *plat = dev_get_plat(dev);
|
|
uint val;
|
|
|
|
regmap_read(plat->hwver, 0, &val);
|
|
|
|
snprintf(buf, size, "MediaTek MT%04X", val);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mtk_cpu_get_count(const struct udevice *dev)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static int mtk_cpu_get_vendor(const struct udevice *dev, char *buf, int size)
|
|
{
|
|
snprintf(buf, size, "MediaTek");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mtk_cpu_probe(struct udevice *dev)
|
|
{
|
|
struct mtk_cpu_plat *plat = dev_get_plat(dev);
|
|
struct ofnode_phandle_args args;
|
|
int ret;
|
|
|
|
ret = dev_read_phandle_with_args(dev, "mediatek,hwver", NULL, 0, 0,
|
|
&args);
|
|
if (ret)
|
|
return ret;
|
|
|
|
plat->hwver = syscon_node_to_regmap(args.node);
|
|
if (IS_ERR(plat->hwver))
|
|
return PTR_ERR(plat->hwver);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct cpu_ops mtk_cpu_ops = {
|
|
.get_desc = mtk_cpu_get_desc,
|
|
.get_count = mtk_cpu_get_count,
|
|
.get_vendor = mtk_cpu_get_vendor,
|
|
};
|
|
|
|
static const struct udevice_id mtk_cpu_ids[] = {
|
|
{ .compatible = "arm,cortex-a7" },
|
|
{ .compatible = "arm,cortex-a53" },
|
|
{ .compatible = "arm,cortex-a73" },
|
|
{ /* sentinel */ }
|
|
};
|
|
|
|
U_BOOT_DRIVER(cpu_mtk) = {
|
|
.name = "mtk-cpu",
|
|
.id = UCLASS_CPU,
|
|
.of_match = mtk_cpu_ids,
|
|
.ops = &mtk_cpu_ops,
|
|
.probe = mtk_cpu_probe,
|
|
.plat_auto = sizeof(struct mtk_cpu_plat),
|
|
.flags = DM_FLAG_PRE_RELOC,
|
|
};
|