drivers/mtd/nand/raw/denali_dt.c

Source file repositories/reference/linux-study-clean/drivers/mtd/nand/raw/denali_dt.c

File Facts

System
Linux kernel
Corpus path
drivers/mtd/nand/raw/denali_dt.c
Extension
.c
Size
5824 bytes
Lines
236
Domain
Driver Families
Bucket
drivers/mtd
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 denali_dt {
	struct denali_controller controller;
	struct clk *clk;	/* core clock */
	struct clk *clk_x;	/* bus interface clock */
	struct clk *clk_ecc;	/* ECC circuit clock */
	struct reset_control *rst;	/* core reset */
	struct reset_control *rst_reg;	/* register reset */
};

struct denali_dt_data {
	unsigned int revision;
	unsigned int caps;
	unsigned int oob_skip_bytes;
	const struct nand_ecc_caps *ecc_caps;
};

NAND_ECC_CAPS_SINGLE(denali_socfpga_ecc_caps, denali_calc_ecc_bytes,
		     512, 8, 15);
static const struct denali_dt_data denali_socfpga_data = {
	.caps = DENALI_CAP_HW_ECC_FIXUP,
	.oob_skip_bytes = 2,
	.ecc_caps = &denali_socfpga_ecc_caps,
};

NAND_ECC_CAPS_SINGLE(denali_uniphier_v5a_ecc_caps, denali_calc_ecc_bytes,
		     1024, 8, 16, 24);
static const struct denali_dt_data denali_uniphier_v5a_data = {
	.caps = DENALI_CAP_HW_ECC_FIXUP |
		DENALI_CAP_DMA_64BIT,
	.oob_skip_bytes = 8,
	.ecc_caps = &denali_uniphier_v5a_ecc_caps,
};

NAND_ECC_CAPS_SINGLE(denali_uniphier_v5b_ecc_caps, denali_calc_ecc_bytes,
		     1024, 8, 16);
static const struct denali_dt_data denali_uniphier_v5b_data = {
	.revision = 0x0501,
	.caps = DENALI_CAP_HW_ECC_FIXUP |
		DENALI_CAP_DMA_64BIT,
	.oob_skip_bytes = 8,
	.ecc_caps = &denali_uniphier_v5b_ecc_caps,
};

static const struct of_device_id denali_nand_dt_ids[] = {
	{
		.compatible = "altr,socfpga-denali-nand",
		.data = &denali_socfpga_data,
	},
	{
		.compatible = "socionext,uniphier-denali-nand-v5a",
		.data = &denali_uniphier_v5a_data,
	},
	{
		.compatible = "socionext,uniphier-denali-nand-v5b",
		.data = &denali_uniphier_v5b_data,
	},
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, denali_nand_dt_ids);

static int denali_dt_chip_init(struct denali_controller *denali,
			       struct device_node *chip_np)
{
	struct denali_chip *dchip;
	u32 bank;
	int nsels, i, ret;

	nsels = of_property_count_u32_elems(chip_np, "reg");
	if (nsels < 0)
		return nsels;

	dchip = devm_kzalloc(denali->dev, struct_size(dchip, sels, nsels),
			     GFP_KERNEL);
	if (!dchip)
		return -ENOMEM;

	dchip->nsels = nsels;

	for (i = 0; i < nsels; i++) {
		ret = of_property_read_u32_index(chip_np, "reg", i, &bank);
		if (ret)
			return ret;

		dchip->sels[i].bank = bank;

		nand_set_flash_node(&dchip->chip, chip_np);
	}

	return denali_chip_init(denali, dchip);
}

Annotation

Implementation Notes