arch/arm/mach-mediatek/platsmp.c

Source file repositories/reference/linux-study-clean/arch/arm/mach-mediatek/platsmp.c

File Facts

System
Linux kernel
Corpus path
arch/arm/mach-mediatek/platsmp.c
Extension
.c
Size
4057 bytes
Lines
152
Domain
Architecture Layer
Bucket
arch/arm
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

struct mtk_smp_boot_info {
	unsigned long smp_base;
	unsigned int jump_reg;
	unsigned int core_keys[MTK_MAX_CPU - 1];
	unsigned int core_regs[MTK_MAX_CPU - 1];
};

static const struct mtk_smp_boot_info mtk_mt8135_tz_boot = {
	0x80002000, 0x3fc,
	{ 0x534c4131, 0x4c415332, 0x41534c33 },
	{ 0x3f8, 0x3f8, 0x3f8 },
};

static const struct mtk_smp_boot_info mtk_mt6572_boot = {
	0x10001400, 0x08,
	{ 0x534c4131 },
	{ 0x0c },
};

static const struct mtk_smp_boot_info mtk_mt6589_boot = {
	0x10002000, 0x34,
	{ 0x534c4131, 0x4c415332, 0x41534c33 },
	{ 0x38, 0x3c, 0x40 },
};

static const struct mtk_smp_boot_info mtk_mt7623_boot = {
	0x10202000, 0x34,
	{ 0x534c4131, 0x4c415332, 0x41534c33 },
	{ 0x38, 0x3c, 0x40 },
};

static const struct of_device_id mtk_tz_smp_boot_infos[] __initconst = {
	{ .compatible   = "mediatek,mt8135", .data = &mtk_mt8135_tz_boot },
	{ .compatible   = "mediatek,mt8127", .data = &mtk_mt8135_tz_boot },
	{ .compatible   = "mediatek,mt2701", .data = &mtk_mt8135_tz_boot },
	{},
};

static const struct of_device_id mtk_smp_boot_infos[] __initconst = {
	{ .compatible   = "mediatek,mt6572", .data = &mtk_mt6572_boot },
	{ .compatible   = "mediatek,mt6582", .data = &mtk_mt7623_boot },
	{ .compatible   = "mediatek,mt6589", .data = &mtk_mt6589_boot },
	{ .compatible   = "mediatek,mt7623", .data = &mtk_mt7623_boot },
	{ .compatible   = "mediatek,mt7629", .data = &mtk_mt7623_boot },
	{},
};

static void __iomem *mtk_smp_base;
static const struct mtk_smp_boot_info *mtk_smp_info;

static int mtk_boot_secondary(unsigned int cpu, struct task_struct *idle)
{
	if (!mtk_smp_base)
		return -EINVAL;

	if (!mtk_smp_info->core_keys[cpu-1])
		return -EINVAL;

	writel_relaxed(mtk_smp_info->core_keys[cpu-1],
		mtk_smp_base + mtk_smp_info->core_regs[cpu-1]);

	arch_send_wakeup_ipi_mask(cpumask_of(cpu));

	return 0;
}

static void __init __mtk_smp_prepare_cpus(unsigned int max_cpus, int trustzone)
{
	int i, num;
	const struct of_device_id *infos;

	if (trustzone) {
		num = ARRAY_SIZE(mtk_tz_smp_boot_infos);
		infos = mtk_tz_smp_boot_infos;
	} else {
		num = ARRAY_SIZE(mtk_smp_boot_infos);
		infos = mtk_smp_boot_infos;
	}

	/* Find smp boot info for this SoC */
	for (i = 0; i < num; i++) {
		if (of_machine_is_compatible(infos[i].compatible)) {
			mtk_smp_info = infos[i].data;
			break;
		}
	}

	if (!mtk_smp_info) {
		pr_err("%s: Device is not supported\n", __func__);
		return;

Annotation

Implementation Notes