drivers/memory/da8xx-ddrctl.c

Source file repositories/reference/linux-study-clean/drivers/memory/da8xx-ddrctl.c

File Facts

System
Linux kernel
Corpus path
drivers/memory/da8xx-ddrctl.c
Extension
.c
Size
3894 bytes
Lines
166
Domain
Driver Families
Bucket
drivers/memory
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 da8xx_ddrctl_config_knob {
	const char *name;
	u32 reg;
	u32 mask;
	u32 shift;
};

static const struct da8xx_ddrctl_config_knob da8xx_ddrctl_knobs[] = {
	{
		.name = "da850-pbbpr",
		.reg = 0x20,
		.mask = 0xffffff00,
		.shift = 0,
	},
};

struct da8xx_ddrctl_setting {
	const char *name;
	u32 val;
};

struct da8xx_ddrctl_board_settings {
	const char *board;
	const struct da8xx_ddrctl_setting *settings;
};

static const struct da8xx_ddrctl_setting da850_lcdk_ddrctl_settings[] = {
	{
		.name = "da850-pbbpr",
		.val = 0x20,
	},
	{ }
};

static const struct da8xx_ddrctl_board_settings da8xx_ddrctl_board_confs[] = {
	{
		.board = "ti,da850-lcdk",
		.settings = da850_lcdk_ddrctl_settings,
	},
};

static const struct da8xx_ddrctl_config_knob *
da8xx_ddrctl_match_knob(const struct da8xx_ddrctl_setting *setting)
{
	const struct da8xx_ddrctl_config_knob *knob;
	int i;

	for (i = 0; i < ARRAY_SIZE(da8xx_ddrctl_knobs); i++) {
		knob = &da8xx_ddrctl_knobs[i];

		if (strcmp(knob->name, setting->name) == 0)
			return knob;
	}

	return NULL;
}

static const struct da8xx_ddrctl_setting *da8xx_ddrctl_get_board_settings(void)
{
	const struct da8xx_ddrctl_board_settings *board_settings;
	int i;

	for (i = 0; i < ARRAY_SIZE(da8xx_ddrctl_board_confs); i++) {
		board_settings = &da8xx_ddrctl_board_confs[i];

		if (of_machine_is_compatible(board_settings->board))
			return board_settings->settings;
	}

	return NULL;
}

static int da8xx_ddrctl_probe(struct platform_device *pdev)
{
	const struct da8xx_ddrctl_config_knob *knob;
	const struct da8xx_ddrctl_setting *setting;
	struct resource *res;
	void __iomem *ddrctl;
	struct device *dev;
	u32 reg;

	dev = &pdev->dev;

	setting = da8xx_ddrctl_get_board_settings();
	if (!setting) {
		dev_err(dev, "no settings defined for this board\n");
		return -EINVAL;
	}

	ddrctl = devm_platform_get_and_ioremap_resource(pdev, 0, &res);

Annotation

Implementation Notes