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0ea329fec4
Weijie Gao has submitted an updated version of the patchset adding support for MT7986 and MT7981 to U-Boot. Use that v2 patchset. Changes of v2: - Add cpu driver for print_cpuinfo() - Fix NULL pointer dereference in mtk_image (was already fixed in OpenWrt) - Fix coding style - Minor changes https://patchwork.ozlabs.org/project/uboot/list/?series=316148 Signed-off-by: Daniel Golle <daniel@makrotopia.org>
134 lines
3.1 KiB
Diff
134 lines
3.1 KiB
Diff
From e3c707d23a3a5bc1ba9b8c03731a32c3714ae56a Mon Sep 17 00:00:00 2001
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From: Weijie Gao <weijie.gao@mediatek.com>
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Date: Wed, 31 Aug 2022 19:05:20 +0800
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Subject: [PATCH 28/32] cpu: add basic cpu driver for MediaTek ARM chips
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Add basic CPU driver used to retrieve CPU model information.
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Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
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---
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drivers/cpu/Makefile | 1 +
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drivers/cpu/mtk_cpu.c | 106 ++++++++++++++++++++++++++++++++++++++++++
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2 files changed, 107 insertions(+)
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create mode 100644 drivers/cpu/mtk_cpu.c
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--- a/drivers/cpu/Makefile
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+++ b/drivers/cpu/Makefile
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@@ -9,6 +9,7 @@ obj-$(CONFIG_CPU) += cpu-uclass.o
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obj-$(CONFIG_ARCH_BMIPS) += bmips_cpu.o
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obj-$(CONFIG_ARCH_IMX8) += imx8_cpu.o
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obj-$(CONFIG_ARCH_AT91) += at91_cpu.o
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+obj-$(CONFIG_ARCH_MEDIATEK) += mtk_cpu.o
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obj-$(CONFIG_CPU_MPC83XX) += mpc83xx_cpu.o
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obj-$(CONFIG_CPU_RISCV) += riscv_cpu.o
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obj-$(CONFIG_SANDBOX) += cpu_sandbox.o
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--- /dev/null
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+++ b/drivers/cpu/mtk_cpu.c
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@@ -0,0 +1,106 @@
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+// SPDX-License-Identifier: GPL-2.0
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+/*
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+ * Copyright (C) 2022 MediaTek Inc. All rights reserved.
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+ *
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+ * Author: Weijie Gao <weijie.gao@mediatek.com>
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+ */
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+
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+#include <linux/types.h>
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+#include <cpu.h>
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+#include <dm.h>
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+#include <fdt_support.h>
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+#include <mapmem.h>
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+#include <asm/global_data.h>
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+#include <linux/io.h>
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+
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+DECLARE_GLOBAL_DATA_PTR;
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+
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+struct mtk_cpu_plat {
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+ void __iomem *hwver_base;
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+};
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+
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+static int mtk_cpu_get_desc(const struct udevice *dev, char *buf, int size)
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+{
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+ struct mtk_cpu_plat *plat = dev_get_plat(dev);
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+
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+ snprintf(buf, size, "MediaTek MT%04X", readl(plat->hwver_base));
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+
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+ return 0;
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+}
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+
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+static int mtk_cpu_get_count(const struct udevice *dev)
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+{
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+ return 1;
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+}
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+
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+static int mtk_cpu_get_vendor(const struct udevice *dev, char *buf, int size)
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+{
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+ snprintf(buf, size, "MediaTek");
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+
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+ return 0;
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+}
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+
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+static int mtk_cpu_probe(struct udevice *dev)
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+{
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+ struct mtk_cpu_plat *plat = dev_get_plat(dev);
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+ const void *fdt = gd->fdt_blob, *reg;
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+ int offset, parent, len, na, ns;
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+ u64 addr;
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+
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+ if (!fdt)
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+ return -ENODEV;
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+
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+ offset = fdt_path_offset(fdt, "/hwver");
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+ if (offset < 0)
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+ return -ENODEV;
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+
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+ parent = fdt_parent_offset(fdt, offset);
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+ if (parent < 0)
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+ return -ENODEV;
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+
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+ na = fdt_address_cells(fdt, parent);
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+ if (na < 1)
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+ return -ENODEV;
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+
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+ ns = fdt_size_cells(gd->fdt_blob, parent);
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+ if (ns < 0)
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+ return -ENODEV;
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+
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+ reg = fdt_getprop(gd->fdt_blob, offset, "reg", &len);
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+ if (!reg)
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+ return -ENODEV;
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+
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+ if (ns)
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+ addr = fdt_translate_address(fdt, offset, reg);
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+ else
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+ addr = fdt_read_number(reg, na);
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+
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+ plat->hwver_base = map_sysmem(addr, 0);
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+ if (!plat->hwver_base)
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+ return -EINVAL;
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+
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+ return 0;
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+}
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+
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+static const struct cpu_ops mtk_cpu_ops = {
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+ .get_desc = mtk_cpu_get_desc,
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+ .get_count = mtk_cpu_get_count,
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+ .get_vendor = mtk_cpu_get_vendor,
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+};
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+
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+static const struct udevice_id mtk_cpu_ids[] = {
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+ { .compatible = "arm,cortex-a7" },
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+ { .compatible = "arm,cortex-a53" },
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+ { .compatible = "arm,cortex-a73" },
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+ { /* sentinel */ }
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+};
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+
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+U_BOOT_DRIVER(cpu_mtk) = {
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+ .name = "mtk-cpu",
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+ .id = UCLASS_CPU,
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+ .of_match = mtk_cpu_ids,
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+ .ops = &mtk_cpu_ops,
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+ .probe = mtk_cpu_probe,
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+ .plat_auto = sizeof(struct mtk_cpu_plat),
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+ .flags = DM_FLAG_PRE_RELOC,
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+};
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