arch/sh/boards/mach-se/7343/irq.c

Source file repositories/reference/linux-study-clean/arch/sh/boards/mach-se/7343/irq.c

File Facts

System
Linux kernel
Corpus path
arch/sh/boards/mach-se/7343/irq.c
Extension
.c
Size
3050 bytes
Lines
125
Domain
Architecture Layer
Bucket
arch/sh
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

if (unlikely(irq == 0)) {
			printk("Failed to allocate IRQ %d\n", i);
			return;
		}
	}
}

static void __init se7343_gc_init(void)
{
	struct irq_chip_generic *gc;
	struct irq_chip_type *ct;
	unsigned int irq_base;

	irq_base = irq_find_mapping(se7343_irq_domain, 0);

	gc = irq_alloc_generic_chip(DRV_NAME, 1, irq_base, se7343_irq_regs,
				    handle_level_irq);
	if (unlikely(!gc))
		return;

	ct = gc->chip_types;
	ct->chip.irq_mask = irq_gc_mask_set_bit;
	ct->chip.irq_unmask = irq_gc_mask_clr_bit;

	ct->regs.mask = PA_CPLD_IMSK_REG;

	irq_setup_generic_chip(gc, IRQ_MSK(SE7343_FPGA_IRQ_NR),
			       IRQ_GC_INIT_MASK_CACHE,
			       IRQ_NOREQUEST | IRQ_NOPROBE, 0);

	irq_set_chained_handler(IRQ0_IRQ, se7343_irq_demux);
	irq_set_irq_type(IRQ0_IRQ, IRQ_TYPE_LEVEL_LOW);

	irq_set_chained_handler(IRQ1_IRQ, se7343_irq_demux);
	irq_set_irq_type(IRQ1_IRQ, IRQ_TYPE_LEVEL_LOW);

	irq_set_chained_handler(IRQ4_IRQ, se7343_irq_demux);
	irq_set_irq_type(IRQ4_IRQ, IRQ_TYPE_LEVEL_LOW);

	irq_set_chained_handler(IRQ5_IRQ, se7343_irq_demux);
	irq_set_irq_type(IRQ5_IRQ, IRQ_TYPE_LEVEL_LOW);
}

/*
 * Initialize IRQ setting
 */
void __init init_7343se_IRQ(void)
{
	se7343_irq_regs = ioremap(PA_CPLD_BASE_ADDR, SZ_16);
	if (unlikely(!se7343_irq_regs)) {
		pr_err("Failed to remap CPLD\n");
		return;
	}

	/*
	 * All FPGA IRQs disabled by default
	 */
	iowrite16(0, se7343_irq_regs + PA_CPLD_IMSK_REG);

	__raw_writew(0x2000, 0xb03fffec);	/* mrshpc irq enable */

	se7343_domain_init();
	se7343_gc_init();
}

Annotation

Implementation Notes