drivers/pinctrl/renesas/core.c

Source file repositories/reference/linux-study-clean/drivers/pinctrl/renesas/core.c

File Facts

System
Linux kernel
Corpus path
drivers/pinctrl/renesas/core.c
Extension
.c
Size
35826 bytes
Lines
1437
Domain
Driver Families
Bucket
drivers/pinctrl
Inferred role
Driver Families: exported/initcall integration point
Status
integration 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

if (f_width) {
				curr_width = f_width;
			} else {
				curr_width = abs(config_reg->var_field_width[m]);
				if (config_reg->var_field_width[m] < 0)
					continue;
			}

			ncomb = 1 << curr_width;
			for (n = 0; n < ncomb; n++) {
				if (config_reg->enum_ids[pos + n] == enum_id) {
					*crp = config_reg;
					*fieldp = m;
					*valuep = n;
					return 0;
				}
			}
			pos += ncomb;
		}
		k++;
	}

	return -EINVAL;
}

static int sh_pfc_mark_to_enum(struct sh_pfc *pfc, u16 mark, int pos,
			      u16 *enum_idp)
{
	const u16 *data = pfc->info->pinmux_data;
	unsigned int k;

	if (pos) {
		*enum_idp = data[pos + 1];
		return pos + 1;
	}

	for (k = 0; k < pfc->info->pinmux_data_size; k++) {
		if (data[k] == mark) {
			*enum_idp = data[k + 1];
			return k + 1;
		}
	}

	dev_err(pfc->dev, "cannot locate data/mark enum_id for mark %d\n",
		mark);
	return -EINVAL;
}

int sh_pfc_config_mux(struct sh_pfc *pfc, unsigned mark, int pinmux_type)
{
	const struct pinmux_range *range;
	int pos = 0;

	switch (pinmux_type) {
	case PINMUX_TYPE_GPIO:
	case PINMUX_TYPE_FUNCTION:
		range = NULL;
		break;

#ifdef CONFIG_PINCTRL_SH_PFC_GPIO
	case PINMUX_TYPE_OUTPUT:
		range = &pfc->info->output;
		break;

	case PINMUX_TYPE_INPUT:
		range = &pfc->info->input;
		break;
#endif /* CONFIG_PINCTRL_SH_PFC_GPIO */

	default:
		return -EINVAL;
	}

	/* Iterate over all the configuration fields we need to update. */
	while (1) {
		const struct pinmux_cfg_reg *cr;
		unsigned int field;
		u16 enum_id;
		u32 value;
		int in_range;
		int ret;

		pos = sh_pfc_mark_to_enum(pfc, mark, pos, &enum_id);
		if (pos < 0)
			return pos;

		if (!enum_id)
			break;

		/* Check if the configuration field selects a function. If it

Annotation

Implementation Notes