178 lines
4.6 KiB
C
178 lines
4.6 KiB
C
/*
|
|
* Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
|
|
* Copyright (C) 2007-2009 PetaLogix
|
|
* Copyright (C) 2006 Atmark Techno, Inc.
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/irqdomain.h>
|
|
#include <linux/irq.h>
|
|
#include <asm/page.h>
|
|
#include <linux/io.h>
|
|
#include <linux/bug.h>
|
|
|
|
#include <asm/prom.h>
|
|
#include <asm/irq.h>
|
|
|
|
#ifdef CONFIG_SELFMOD_INTC
|
|
#include <asm/selfmod.h>
|
|
#define INTC_BASE BARRIER_BASE_ADDR
|
|
#else
|
|
static unsigned int intc_baseaddr;
|
|
#define INTC_BASE intc_baseaddr
|
|
#endif
|
|
|
|
/* No one else should require these constants, so define them locally here. */
|
|
#define ISR 0x00 /* Interrupt Status Register */
|
|
#define IPR 0x04 /* Interrupt Pending Register */
|
|
#define IER 0x08 /* Interrupt Enable Register */
|
|
#define IAR 0x0c /* Interrupt Acknowledge Register */
|
|
#define SIE 0x10 /* Set Interrupt Enable bits */
|
|
#define CIE 0x14 /* Clear Interrupt Enable bits */
|
|
#define IVR 0x18 /* Interrupt Vector Register */
|
|
#define MER 0x1c /* Master Enable Register */
|
|
|
|
#define MER_ME (1<<0)
|
|
#define MER_HIE (1<<1)
|
|
|
|
static void intc_enable_or_unmask(struct irq_data *d)
|
|
{
|
|
unsigned long mask = 1 << d->hwirq;
|
|
|
|
pr_debug("enable_or_unmask: %ld\n", d->hwirq);
|
|
|
|
/* ack level irqs because they can't be acked during
|
|
* ack function since the handle_level_irq function
|
|
* acks the irq before calling the interrupt handler
|
|
*/
|
|
if (irqd_is_level_type(d))
|
|
out_be32(INTC_BASE + IAR, mask);
|
|
|
|
out_be32(INTC_BASE + SIE, mask);
|
|
}
|
|
|
|
static void intc_disable_or_mask(struct irq_data *d)
|
|
{
|
|
pr_debug("disable: %ld\n", d->hwirq);
|
|
out_be32(INTC_BASE + CIE, 1 << d->hwirq);
|
|
}
|
|
|
|
static void intc_ack(struct irq_data *d)
|
|
{
|
|
pr_debug("ack: %ld\n", d->hwirq);
|
|
out_be32(INTC_BASE + IAR, 1 << d->hwirq);
|
|
}
|
|
|
|
static void intc_mask_ack(struct irq_data *d)
|
|
{
|
|
unsigned long mask = 1 << d->hwirq;
|
|
|
|
pr_debug("disable_and_ack: %ld\n", d->hwirq);
|
|
out_be32(INTC_BASE + CIE, mask);
|
|
out_be32(INTC_BASE + IAR, mask);
|
|
}
|
|
|
|
static struct irq_chip intc_dev = {
|
|
.name = "Xilinx INTC",
|
|
.irq_unmask = intc_enable_or_unmask,
|
|
.irq_mask = intc_disable_or_mask,
|
|
.irq_ack = intc_ack,
|
|
.irq_mask_ack = intc_mask_ack,
|
|
};
|
|
|
|
static struct irq_domain *root_domain;
|
|
|
|
unsigned int get_irq(void)
|
|
{
|
|
unsigned int hwirq, irq = -1;
|
|
|
|
hwirq = in_be32(INTC_BASE + IVR);
|
|
if (hwirq != -1U)
|
|
irq = irq_find_mapping(root_domain, hwirq);
|
|
|
|
pr_debug("get_irq: hwirq=%d, irq=%d\n", hwirq, irq);
|
|
|
|
return irq;
|
|
}
|
|
|
|
static int xintc_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw)
|
|
{
|
|
u32 intr_mask = (u32)d->host_data;
|
|
|
|
if (intr_mask & (1 << hw)) {
|
|
irq_set_chip_and_handler_name(irq, &intc_dev,
|
|
handle_edge_irq, "edge");
|
|
irq_clear_status_flags(irq, IRQ_LEVEL);
|
|
} else {
|
|
irq_set_chip_and_handler_name(irq, &intc_dev,
|
|
handle_level_irq, "level");
|
|
irq_set_status_flags(irq, IRQ_LEVEL);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const struct irq_domain_ops xintc_irq_domain_ops = {
|
|
.xlate = irq_domain_xlate_onetwocell,
|
|
.map = xintc_map,
|
|
};
|
|
|
|
void __init init_IRQ(void)
|
|
{
|
|
u32 nr_irq, intr_mask;
|
|
struct device_node *intc = NULL;
|
|
#ifdef CONFIG_SELFMOD_INTC
|
|
unsigned int intc_baseaddr = 0;
|
|
static int arr_func[] = {
|
|
(int)&get_irq,
|
|
(int)&intc_enable_or_unmask,
|
|
(int)&intc_disable_or_mask,
|
|
(int)&intc_mask_ack,
|
|
(int)&intc_ack,
|
|
(int)&intc_end,
|
|
0
|
|
};
|
|
#endif
|
|
intc = of_find_compatible_node(NULL, NULL, "xlnx,xps-intc-1.00.a");
|
|
BUG_ON(!intc);
|
|
|
|
intc_baseaddr = be32_to_cpup(of_get_property(intc, "reg", NULL));
|
|
intc_baseaddr = (unsigned long) ioremap(intc_baseaddr, PAGE_SIZE);
|
|
nr_irq = be32_to_cpup(of_get_property(intc,
|
|
"xlnx,num-intr-inputs", NULL));
|
|
|
|
intr_mask =
|
|
be32_to_cpup(of_get_property(intc, "xlnx,kind-of-intr", NULL));
|
|
if (intr_mask > (u32)((1ULL << nr_irq) - 1))
|
|
pr_info(" ERROR: Mismatch in kind-of-intr param\n");
|
|
|
|
#ifdef CONFIG_SELFMOD_INTC
|
|
selfmod_function((int *) arr_func, intc_baseaddr);
|
|
#endif
|
|
pr_info("%s #0 at 0x%08x, num_irq=%d, edge=0x%x\n",
|
|
intc->name, intc_baseaddr, nr_irq, intr_mask);
|
|
|
|
/*
|
|
* Disable all external interrupts until they are
|
|
* explicity requested.
|
|
*/
|
|
out_be32(intc_baseaddr + IER, 0);
|
|
|
|
/* Acknowledge any pending interrupts just in case. */
|
|
out_be32(intc_baseaddr + IAR, 0xffffffff);
|
|
|
|
/* Turn on the Master Enable. */
|
|
out_be32(intc_baseaddr + MER, MER_HIE | MER_ME);
|
|
|
|
/* Yeah, okay, casting the intr_mask to a void* is butt-ugly, but I'm
|
|
* lazy and Michal can clean it up to something nicer when he tests
|
|
* and commits this patch. ~~gcl */
|
|
root_domain = irq_domain_add_linear(intc, nr_irq, &xintc_irq_domain_ops,
|
|
(void *)intr_mask);
|
|
|
|
irq_set_default_host(root_domain);
|
|
}
|