170 строки
4.3 KiB
C
170 строки
4.3 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/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
|
|
|
|
unsigned int nr_irq;
|
|
|
|
/* 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->irq;
|
|
pr_debug("enable_or_unmask: %d\n", d->irq);
|
|
out_be32(INTC_BASE + SIE, mask);
|
|
|
|
/* 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);
|
|
}
|
|
|
|
static void intc_disable_or_mask(struct irq_data *d)
|
|
{
|
|
pr_debug("disable: %d\n", d->irq);
|
|
out_be32(INTC_BASE + CIE, 1 << d->irq);
|
|
}
|
|
|
|
static void intc_ack(struct irq_data *d)
|
|
{
|
|
pr_debug("ack: %d\n", d->irq);
|
|
out_be32(INTC_BASE + IAR, 1 << d->irq);
|
|
}
|
|
|
|
static void intc_mask_ack(struct irq_data *d)
|
|
{
|
|
unsigned long mask = 1 << d->irq;
|
|
pr_debug("disable_and_ack: %d\n", d->irq);
|
|
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,
|
|
};
|
|
|
|
unsigned int get_irq(struct pt_regs *regs)
|
|
{
|
|
int irq;
|
|
|
|
/*
|
|
* NOTE: This function is the one that needs to be improved in
|
|
* order to handle multiple interrupt controllers. It currently
|
|
* is hardcoded to check for interrupts only on the first INTC.
|
|
*/
|
|
irq = in_be32(INTC_BASE + IVR);
|
|
pr_debug("get_irq: %d\n", irq);
|
|
|
|
return irq;
|
|
}
|
|
|
|
void __init init_IRQ(void)
|
|
{
|
|
u32 i, j, intr_type;
|
|
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
|
|
const char * const intc_list[] = {
|
|
"xlnx,xps-intc-1.00.a",
|
|
NULL
|
|
};
|
|
|
|
for (j = 0; intc_list[j] != NULL; j++) {
|
|
intc = of_find_compatible_node(NULL, NULL, intc_list[j]);
|
|
if (intc)
|
|
break;
|
|
}
|
|
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_type =
|
|
be32_to_cpup(of_get_property(intc,
|
|
"xlnx,kind-of-intr", NULL));
|
|
if (intr_type > (u32)((1ULL << nr_irq) - 1))
|
|
printk(KERN_INFO " ERROR: Mismatch in kind-of-intr param\n");
|
|
|
|
#ifdef CONFIG_SELFMOD_INTC
|
|
selfmod_function((int *) arr_func, intc_baseaddr);
|
|
#endif
|
|
printk(KERN_INFO "%s #0 at 0x%08x, num_irq=%d, edge=0x%x\n",
|
|
intc_list[j], intc_baseaddr, nr_irq, intr_type);
|
|
|
|
/*
|
|
* 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);
|
|
|
|
for (i = 0; i < nr_irq; ++i) {
|
|
if (intr_type & (0x00000001 << i)) {
|
|
irq_set_chip_and_handler_name(i, &intc_dev,
|
|
handle_edge_irq, "edge");
|
|
irq_clear_status_flags(i, IRQ_LEVEL);
|
|
} else {
|
|
irq_set_chip_and_handler_name(i, &intc_dev,
|
|
handle_level_irq, "level");
|
|
irq_set_status_flags(i, IRQ_LEVEL);
|
|
}
|
|
}
|
|
}
|