Commit 2462bacd authored by Grant Likely's avatar Grant Likely

irq_domain/microblaze: Convert microblaze to use irq_domains

This patch converts Microblaze to use the irq_domain remapper and get
away from hard coding the offset between hwirq number and the linux irq
number space.  This also paves the way for multiple interrupt controllers.

v2: Don't enable SPARSE_IRQ and keep NR_IRQS set to 33
Signed-off-by: default avatarGrant Likely <grant.likely@secretlab.ca>
Signed-off-by: default avatarMichal Simek <monstr@monstr.eu>
Cc: Rob Herring <rob.herring@calxeda.com>
Cc: John Williams <john.williams@petalogix.com>
Cc: John Linn <john.linn@xilinx.com>
parent ff8c3ab8
......@@ -14,6 +14,7 @@ config MICROBLAZE
select TRACING_SUPPORT
select OF
select OF_EARLY_FLATTREE
select IRQ_DOMAIN
select HAVE_GENERIC_HARDIRQS
select GENERIC_IRQ_PROBE
select GENERIC_IRQ_SHOW
......
/*
* 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.
*/
#ifndef _ASM_MICROBLAZE_HARDIRQ_H
#define _ASM_MICROBLAZE_HARDIRQ_H
/* should be defined in each interrupt controller driver */
extern unsigned int get_irq(struct pt_regs *regs);
#include <asm-generic/hardirq.h>
#endif /* _ASM_MICROBLAZE_HARDIRQ_H */
......@@ -9,49 +9,13 @@
#ifndef _ASM_MICROBLAZE_IRQ_H
#define _ASM_MICROBLAZE_IRQ_H
/*
* Linux IRQ# is currently offset by one to map to the hardware
* irq number. So hardware IRQ0 maps to Linux irq 1.
*/
#define NO_IRQ_OFFSET 1
#define IRQ_OFFSET NO_IRQ_OFFSET
#define NR_IRQS (32 + IRQ_OFFSET)
#define NR_IRQS (32 + 1)
#include <asm-generic/irq.h>
/* This type is the placeholder for a hardware interrupt number. It has to
* be big enough to enclose whatever representation is used by a given
* platform.
*/
typedef unsigned long irq_hw_number_t;
extern unsigned int nr_irq;
struct pt_regs;
extern void do_IRQ(struct pt_regs *regs);
/** FIXME - not implement
* irq_dispose_mapping - Unmap an interrupt
* @virq: linux virq number of the interrupt to unmap
*/
static inline void irq_dispose_mapping(unsigned int virq)
{
return;
}
struct irq_domain;
/**
* irq_create_mapping - Map a hardware interrupt into linux virq space
* @host: host owning this hardware interrupt or NULL for default host
* @hwirq: hardware irq number in that host space
*
* Only one mapping per hardware interrupt is permitted. Returns a linux
* virq number.
* If the sense/trigger is to be specified, set_irq_type() should be called
* on the number returned from that call.
*/
extern unsigned int irq_create_mapping(struct irq_domain *host,
irq_hw_number_t hwirq);
/* should be defined in each interrupt controller driver */
extern unsigned int get_irq(void);
#endif /* _ASM_MICROBLAZE_IRQ_H */
......@@ -9,6 +9,7 @@
*/
#include <linux/init.h>
#include <linux/irqdomain.h>
#include <linux/irq.h>
#include <asm/page.h>
#include <linux/io.h>
......@@ -25,8 +26,6 @@ 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 */
......@@ -84,24 +83,45 @@ static struct irq_chip intc_dev = {
.irq_mask_ack = intc_mask_ack,
};
unsigned int get_irq(struct pt_regs *regs)
static struct irq_domain *root_domain;
unsigned int get_irq(void)
{
int irq;
unsigned int hwirq, irq = -1;
/*
* 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) + NO_IRQ_OFFSET;
pr_debug("get_irq: %d\n", irq);
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;
}
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 i, intr_mask;
u32 nr_irq, intr_mask;
struct device_node *intc = NULL;
#ifdef CONFIG_SELFMOD_INTC
unsigned int intc_baseaddr = 0;
......@@ -146,16 +166,9 @@ void __init init_IRQ(void)
/* Turn on the Master Enable. */
out_be32(intc_baseaddr + MER, MER_HIE | MER_ME);
for (i = IRQ_OFFSET; i < (nr_irq + IRQ_OFFSET); ++i) {
if (intr_mask & (0x00000001 << (i - IRQ_OFFSET))) {
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);
}
irq_get_irq_data(i)->hwirq = i - IRQ_OFFSET;
}
/* 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);
}
......@@ -31,14 +31,13 @@ void __irq_entry do_IRQ(struct pt_regs *regs)
trace_hardirqs_off();
irq_enter();
irq = get_irq(regs);
irq = get_irq();
next_irq:
BUG_ON(!irq);
/* Substract 1 because of get_irq */
generic_handle_irq(irq + IRQ_OFFSET - NO_IRQ_OFFSET);
generic_handle_irq(irq);
irq = get_irq(regs);
if (irq) {
irq = get_irq();
if (irq != -1U) {
pr_debug("next irq: %d\n", irq);
++concurrent_irq;
goto next_irq;
......@@ -48,18 +47,3 @@ void __irq_entry do_IRQ(struct pt_regs *regs)
set_irq_regs(old_regs);
trace_hardirqs_on();
}
/* MS: There is no any advance mapping mechanism. We are using simple 32bit
intc without any cascades or any connection that's why mapping is 1:1 */
unsigned int irq_create_mapping(struct irq_domain *host, irq_hw_number_t hwirq)
{
return hwirq + IRQ_OFFSET;
}
EXPORT_SYMBOL_GPL(irq_create_mapping);
unsigned int irq_create_of_mapping(struct device_node *controller,
const u32 *intspec, unsigned int intsize)
{
return intspec[0] + IRQ_OFFSET;
}
EXPORT_SYMBOL_GPL(irq_create_of_mapping);
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