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Message-Id: <e6c6595a81f662bf839cee3109d0fa58a596ea47.1646380284.git.michal.simek@xilinx.com>
Date: Fri, 4 Mar 2022 08:51:29 +0100
From: Michal Simek <michal.simek@...inx.com>
To: linux-kernel@...r.kernel.org, monstr@...str.eu,
michal.simek@...inx.com, git@...inx.com
Cc: Robert Hancock <robert.hancock@...ian.com>,
Stefan Asserhall <stefan.asserhall@...inx.com>,
Marc Zyngier <maz@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>,
linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v2] irqchip: xilinx: Enable generic irq multi handler
Register default arch handler via driver instead of directly pointing to
xilinx intc controller. This patch makes architecture code more generic.
Signed-off-by: Michal Simek <michal.simek@...inx.com>
Reviewed-by: Stefan Asserhall <stefan.asserhall@...inx.com>
---
Changes in v2:
- Remove concurrent_irq variable
- Use generic_handle_domain_irq() - layout by Marc
arch/microblaze/Kconfig | 2 ++
arch/microblaze/include/asm/irq.h | 3 ---
arch/microblaze/kernel/irq.c | 16 +---------------
drivers/irqchip/irq-xilinx-intc.c | 30 ++++++++++++++++--------------
4 files changed, 19 insertions(+), 32 deletions(-)
diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig
index 59798e43cdb0..da568e981604 100644
--- a/arch/microblaze/Kconfig
+++ b/arch/microblaze/Kconfig
@@ -45,6 +45,8 @@ config MICROBLAZE
select SET_FS
select ZONE_DMA
select TRACE_IRQFLAGS_SUPPORT
+ select GENERIC_IRQ_MULTI_HANDLER
+ select HANDLE_DOMAIN_IRQ
# Endianness selection
choice
diff --git a/arch/microblaze/include/asm/irq.h b/arch/microblaze/include/asm/irq.h
index 0a28e80bbab0..cb6ab55d1d01 100644
--- a/arch/microblaze/include/asm/irq.h
+++ b/arch/microblaze/include/asm/irq.h
@@ -11,7 +11,4 @@
struct pt_regs;
extern void do_IRQ(struct pt_regs *regs);
-/* should be defined in each interrupt controller driver */
-extern unsigned int xintc_get_irq(void);
-
#endif /* _ASM_MICROBLAZE_IRQ_H */
diff --git a/arch/microblaze/kernel/irq.c b/arch/microblaze/kernel/irq.c
index 903dad822fad..1f8cb4c4f74f 100644
--- a/arch/microblaze/kernel/irq.c
+++ b/arch/microblaze/kernel/irq.c
@@ -20,27 +20,13 @@
#include <linux/irqchip.h>
#include <linux/of_irq.h>
-static u32 concurrent_irq;
-
void __irq_entry do_IRQ(struct pt_regs *regs)
{
- unsigned int irq;
struct pt_regs *old_regs = set_irq_regs(regs);
trace_hardirqs_off();
irq_enter();
- irq = xintc_get_irq();
-next_irq:
- BUG_ON(!irq);
- generic_handle_irq(irq);
-
- irq = xintc_get_irq();
- if (irq != -1U) {
- pr_debug("next irq: %d\n", irq);
- ++concurrent_irq;
- goto next_irq;
- }
-
+ handle_arch_irq(regs);
irq_exit();
set_irq_regs(old_regs);
trace_hardirqs_on();
diff --git a/drivers/irqchip/irq-xilinx-intc.c b/drivers/irqchip/irq-xilinx-intc.c
index 356a59755d63..238d3d344949 100644
--- a/drivers/irqchip/irq-xilinx-intc.c
+++ b/drivers/irqchip/irq-xilinx-intc.c
@@ -32,6 +32,8 @@
#define MER_ME (1<<0)
#define MER_HIE (1<<1)
+#define SPURIOUS_IRQ (-1U)
+
static DEFINE_STATIC_KEY_FALSE(xintc_is_be);
struct xintc_irq_chip {
@@ -110,20 +112,6 @@ static struct irq_chip intc_dev = {
.irq_mask_ack = intc_mask_ack,
};
-unsigned int xintc_get_irq(void)
-{
- unsigned int irq = -1;
- u32 hwirq;
-
- hwirq = xintc_read(primary_intc, IVR);
- if (hwirq != -1U)
- irq = irq_find_mapping(primary_intc->root_domain, hwirq);
-
- pr_debug("irq-xilinx: 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)
{
struct xintc_irq_chip *irqc = d->host_data;
@@ -164,6 +152,19 @@ static void xil_intc_irq_handler(struct irq_desc *desc)
chained_irq_exit(chip, desc);
}
+static void xil_intc_handle_irq(struct pt_regs *regs)
+{
+ u32 hwirq;
+
+ do {
+ hwirq = xintc_read(primary_intc, IVR);
+ if (unlikely(hwirq == SPURIOUS_IRQ))
+ break;
+
+ generic_handle_domain_irq(primary_intc->root_domain, hwirq);
+ } while (true);
+}
+
static int __init xilinx_intc_of_init(struct device_node *intc,
struct device_node *parent)
{
@@ -233,6 +234,7 @@ static int __init xilinx_intc_of_init(struct device_node *intc,
} else {
primary_intc = irqc;
irq_set_default_host(primary_intc->root_domain);
+ set_handle_irq(xil_intc_handle_irq);
}
return 0;
--
2.35.1
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