drivers/sh/intc/chip.c

Source file repositories/reference/linux-study-clean/drivers/sh/intc/chip.c

File Facts

System
Linux kernel
Corpus path
drivers/sh/intc/chip.c
Extension
.c
Size
5533 bytes
Lines
212
Domain
Driver Families
Bucket
drivers/sh
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

switch (_INTC_FN(handle)) {
		case REG_FN_MODIFY_BASE + 0:	/* 8bit */
			__raw_readb(addr);
			__raw_writeb(0xff ^ value, addr);
			break;
		case REG_FN_MODIFY_BASE + 1:	/* 16bit */
			__raw_readw(addr);
			__raw_writew(0xffff ^ value, addr);
			break;
		case REG_FN_MODIFY_BASE + 3:	/* 32bit */
			__raw_readl(addr);
			__raw_writel(0xffffffff ^ value, addr);
			break;
		default:
			BUG();
			break;
		}
	}
}

static struct intc_handle_int *intc_find_irq(struct intc_handle_int *hp,
					     unsigned int nr_hp,
					     unsigned int irq)
{
	struct intc_handle_int key;

	key.irq = irq;
	key.handle = 0;

	return bsearch(&key, hp, nr_hp, sizeof(*hp), intc_handle_int_cmp);
}

int intc_set_priority(unsigned int irq, unsigned int prio)
{
	struct intc_desc_int *d = get_intc_desc(irq);
	struct irq_data *data = irq_get_irq_data(irq);
	struct intc_handle_int *ihp;

	if (!intc_get_prio_level(irq) || prio <= 1)
		return -EINVAL;

	ihp = intc_find_irq(d->prio, d->nr_prio, irq);
	if (ihp) {
		if (prio >= (1 << _INTC_WIDTH(ihp->handle)))
			return -EINVAL;

		intc_set_prio_level(irq, prio);

		/*
		 * only set secondary masking method directly
		 * primary masking method is using intc_prio_level[irq]
		 * priority level will be set during next enable()
		 */
		if (_INTC_FN(ihp->handle) != REG_FN_ERR)
			_intc_enable(data, ihp->handle);
	}
	return 0;
}

#define SENSE_VALID_FLAG 0x80
#define VALID(x) (x | SENSE_VALID_FLAG)

static unsigned char intc_irq_sense_table[IRQ_TYPE_SENSE_MASK + 1] = {
	[IRQ_TYPE_EDGE_FALLING] = VALID(0),
	[IRQ_TYPE_EDGE_RISING] = VALID(1),
	[IRQ_TYPE_LEVEL_LOW] = VALID(2),
	/* SH7706, SH7707 and SH7709 do not support high level triggered */
#if !defined(CONFIG_CPU_SUBTYPE_SH7706) && \
    !defined(CONFIG_CPU_SUBTYPE_SH7707) && \
    !defined(CONFIG_CPU_SUBTYPE_SH7709)
	[IRQ_TYPE_LEVEL_HIGH] = VALID(3),
#endif
#if defined(CONFIG_ARM) /* all recent SH-Mobile / R-Mobile ARM support this */
	[IRQ_TYPE_EDGE_BOTH] = VALID(4),
#endif
};

static int intc_set_type(struct irq_data *data, unsigned int type)
{
	unsigned int irq = data->irq;
	struct intc_desc_int *d = get_intc_desc(irq);
	unsigned char value = intc_irq_sense_table[type & IRQ_TYPE_SENSE_MASK];
	struct intc_handle_int *ihp;
	unsigned long addr;

	if (!value)
		return -EINVAL;

	value &= ~SENSE_VALID_FLAG;

Annotation

Implementation Notes