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From:   Talel Shenhar <talel@amazon.com>
To:     <tglx@linutronix.de>, <jason@lakedaemon.net>, <maz@kernel.org>,
        <talel@amazon.com>, <linux-kernel@vger.kernel.org>
CC:     <dwmw@amazon.co.uk>, <benh@kernel.crashing.org>,
        <hhhawa@amazon.com>, <ronenk@amazon.com>, <jonnyc@amazon.com>,
        <hanochu@amazon.com>, <barakw@amazon.com>
Subject: [PATCH 1/1] irqchip: al-fic: add support for irq retrigger
Date:   Mon, 9 Sep 2019 11:39:18 +0300
Message-ID: <1568018358-18985-1-git-send-email-talel@amazon.com>
MIME-Version: 1.0
Content-Type: text/plain
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Introduce interrupts retrigger support for Amazon's Annapurna Labs Fabric
Interrupt Controller.

Signed-off-by: Talel Shenhar <talel@amazon.com>
---
 drivers/irqchip/irq-al-fic.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/irqchip/irq-al-fic.c b/drivers/irqchip/irq-al-fic.c
index 1a57cee..0b0a737 100644
--- a/drivers/irqchip/irq-al-fic.c
+++ b/drivers/irqchip/irq-al-fic.c
@@ -15,6 +15,7 @@
 
 /* FIC Registers */
 #define AL_FIC_CAUSE		0x00
+#define AL_FIC_SET_CAUSE	0x08
 #define AL_FIC_MASK		0x10
 #define AL_FIC_CONTROL		0x28
 
@@ -126,6 +127,16 @@ static void al_fic_irq_handler(struct irq_desc *desc)
 	chained_irq_exit(irqchip, desc);
 }
 
+static int al_fic_irq_retrigger(struct irq_data *data)
+{
+	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data);
+	struct al_fic *fic = gc->private;
+
+	writel_relaxed(BIT(data->hwirq), fic->base + AL_FIC_SET_CAUSE);
+
+	return 1;
+}
+
 static int al_fic_register(struct device_node *node,
 			   struct al_fic *fic)
 {
@@ -159,6 +170,7 @@ static int al_fic_register(struct device_node *node,
 	gc->chip_types->chip.irq_unmask = irq_gc_mask_clr_bit;
 	gc->chip_types->chip.irq_ack = irq_gc_ack_clr_bit;
 	gc->chip_types->chip.irq_set_type = al_fic_irq_set_type;
+	gc->chip_types->chip.irq_retrigger = al_fic_irq_retrigger;
 	gc->chip_types->chip.flags = IRQCHIP_SKIP_SET_WAKE;
 	gc->private = fic;
 
-- 
2.7.4