drivers/dma/dw-edma/dw-hdma-v0-debugfs.c

Source file repositories/reference/linux-study-clean/drivers/dma/dw-edma/dw-hdma-v0-debugfs.c

File Facts

System
Linux kernel
Corpus path
drivers/dma/dw-edma/dw-hdma-v0-debugfs.c
Extension
.c
Size
4697 bytes
Lines
171
Domain
Driver Families
Bucket
drivers/dma
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct dw_hdma_debugfs_entry {
	const char				*name;
	void __iomem				*reg;
};

static int dw_hdma_debugfs_u32_get(void *data, u64 *val)
{
	struct dw_hdma_debugfs_entry *entry = data;
	void __iomem *reg = entry->reg;

	*val = readl(reg);

	return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(fops_x32, dw_hdma_debugfs_u32_get, NULL, "0x%08llx\n");

static void dw_hdma_debugfs_create_x32(struct dw_edma *dw,
				       const struct dw_hdma_debugfs_entry ini[],
				       int nr_entries, struct dentry *dent)
{
	struct dw_hdma_debugfs_entry *entries;
	int i;

	entries = devm_kcalloc(dw->chip->dev, nr_entries, sizeof(*entries),
			       GFP_KERNEL);
	if (!entries)
		return;

	for (i = 0; i < nr_entries; i++) {
		entries[i] = ini[i];

		debugfs_create_file_unsafe(entries[i].name, 0444, dent,
					   &entries[i], &fops_x32);
	}
}

static void dw_hdma_debugfs_regs_ch(struct dw_edma *dw, enum dw_edma_dir dir,
				    u16 ch, struct dentry *dent)
{
	const struct dw_hdma_debugfs_entry debugfs_regs[] = {
		CTX_REGISTER(dw, ch_en, dir, ch),
		CTX_REGISTER(dw, doorbell, dir, ch),
		CTX_REGISTER(dw, prefetch, dir, ch),
		CTX_REGISTER(dw, handshake, dir, ch),
		CTX_REGISTER(dw, llp.lsb, dir, ch),
		CTX_REGISTER(dw, llp.msb, dir, ch),
		CTX_REGISTER(dw, cycle_sync, dir, ch),
		CTX_REGISTER(dw, transfer_size, dir, ch),
		CTX_REGISTER(dw, sar.lsb, dir, ch),
		CTX_REGISTER(dw, sar.msb, dir, ch),
		CTX_REGISTER(dw, dar.lsb, dir, ch),
		CTX_REGISTER(dw, dar.msb, dir, ch),
		CTX_REGISTER(dw, watermark_en, dir, ch),
		CTX_REGISTER(dw, control1, dir, ch),
		CTX_REGISTER(dw, func_num, dir, ch),
		CTX_REGISTER(dw, qos, dir, ch),
		CTX_REGISTER(dw, ch_stat, dir, ch),
		CTX_REGISTER(dw, int_stat, dir, ch),
		CTX_REGISTER(dw, int_setup, dir, ch),
		CTX_REGISTER(dw, int_clear, dir, ch),
		CTX_REGISTER(dw, msi_stop.lsb, dir, ch),
		CTX_REGISTER(dw, msi_stop.msb, dir, ch),
		CTX_REGISTER(dw, msi_watermark.lsb, dir, ch),
		CTX_REGISTER(dw, msi_watermark.msb, dir, ch),
		CTX_REGISTER(dw, msi_abort.lsb, dir, ch),
		CTX_REGISTER(dw, msi_abort.msb, dir, ch),
		CTX_REGISTER(dw, msi_msgdata, dir, ch),
	};
	int nr_entries = ARRAY_SIZE(debugfs_regs);

	dw_hdma_debugfs_create_x32(dw, debugfs_regs, nr_entries, dent);
}

static void dw_hdma_debugfs_regs_wr(struct dw_edma *dw, struct dentry *dent)
{
	struct dentry *regs_dent, *ch_dent;
	char name[32];
	int i;

	regs_dent = debugfs_create_dir(WRITE_STR, dent);

	for (i = 0; i < dw->wr_ch_cnt; i++) {
		snprintf(name, sizeof(name), "%s:%d", CHANNEL_STR, i);

		ch_dent = debugfs_create_dir(name, regs_dent);

		dw_hdma_debugfs_regs_ch(dw, EDMA_DIR_WRITE, i, ch_dent);
	}
}

Annotation

Implementation Notes