linux-kernel - [PATCH v2 5/5] irqchip/irq-bcm7038-l1: Support brcm,int-fwd-mask

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Message-Id: <20190913191542.9908-6-f.fainelli@gmail.com>
Date:   Fri, 13 Sep 2019 12:15:42 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <maz@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Kevin Cernekee <cernekee@...il.com>,
        devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND FLATTENED
        DEVICE TREE BINDINGS),
        bcm-kernel-feedback-list@...adcom.com (open list:BROADCOM BMIPS MIPS
        ARCHITECTURE),
        linux-mips@...r.kernel.org (open list:BROADCOM BMIPS MIPS ARCHITECTURE)
Subject: [PATCH v2 5/5] irqchip/irq-bcm7038-l1: Support brcm,int-fwd-mask

On some specific chips like 7211 we need to leave some interrupts
untouched/forwarded to the VPU which is another agent in the system
making use of that interrupt controller hardware (goes to both ARM GIC
and VPU L1 interrupt controller). Make that possible by using the
existing brcm,int-fwd-mask property.

Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
---
 drivers/irqchip/irq-bcm7038-l1.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/irqchip/irq-bcm7038-l1.c b/drivers/irqchip/irq-bcm7038-l1.c
index 0673a44bbdc2..811a34201dd4 100644
--- a/drivers/irqchip/irq-bcm7038-l1.c
+++ b/drivers/irqchip/irq-bcm7038-l1.c
@@ -44,6 +44,7 @@ struct bcm7038_l1_chip {
 	struct list_head	list;
 	u32			wake_mask[MAX_WORDS];
 #endif
+	u32			irq_fwd_mask[MAX_WORDS];
 	u8			affinity[MAX_WORDS * IRQS_PER_WORD];
 };
 
@@ -265,6 +266,7 @@ static int __init bcm7038_l1_init_one(struct device_node *dn,
 	resource_size_t sz;
 	struct bcm7038_l1_cpu *cpu;
 	unsigned int i, n_words, parent_irq;
+	int ret;
 
 	if (of_address_to_resource(dn, idx, &res))
 		return -EINVAL;
@@ -278,6 +280,14 @@ static int __init bcm7038_l1_init_one(struct device_node *dn,
 	else if (intc->n_words != n_words)
 		return -EINVAL;
 
+	ret = of_property_read_u32_array(dn , "brcm,int-fwd-mask",
+					 intc->irq_fwd_mask, n_words);
+	if (ret != 0 && ret != -EINVAL) {
+		/* property exists but has the wrong number of words */
+		pr_err("invalid brcm,int-fwd-mask property\n");
+		return -EINVAL;
+	}
+
 	cpu = intc->cpus[idx] = kzalloc(sizeof(*cpu) + n_words * sizeof(u32),
 					GFP_KERNEL);
 	if (!cpu)
@@ -288,8 +298,9 @@ static int __init bcm7038_l1_init_one(struct device_node *dn,
 		return -ENOMEM;
 
 	for (i = 0; i < n_words; i++) {
-		l1_writel(0xffffffff, cpu->map_base + reg_mask_set(intc, i));
-		cpu->mask_cache[i] = 0xffffffff;
+		l1_writel(0xffffffff & ~intc->irq_fwd_mask[i],
+			  cpu->map_base + reg_mask_set(intc, i));
+		cpu->mask_cache[i] = 0xffffffff & ~intc->irq_fwd_mask[i];
 	}
 
 	parent_irq = irq_of_parse_and_map(dn, idx);
-- 
2.17.1