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brcm63xx: fix external interrupts on BCM6318

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Setting the clear bit for an interrupt seems to cause interrupts to be
deasserted again immediately. So unset the bit for BCM6318 to allow
subsequent interrupts to still work.

Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
This commit is contained in:
Jonas Gorski 2016-12-19 13:02:21 +01:00
parent 66a63d25c4
commit 94bbd1f057
2 changed files with 21 additions and 8 deletions
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2
target/linux/brcm63xx/dts/bcm6318.dtsi
View file

@ -36,7 +36,7 @@
compatible = "simple-bus";
ext_intc: interrupt-controller@10000018 {
compatible = "brcm,bcm6345-ext-intc";
compatible = "brcm,bcm6318-ext-intc";
reg = <0x10000018 0x4>;
interrupt-controller;

27
target/linux/brcm63xx/patches-4.4/321-irqchip-add-support-for-bcm6345-style-external-inter.patch
View file

@ -23,7 +23,7 @@ Signed-off-by: Jonas Gorski <jogo@openwrt.org>
+
+Required properties:
+
+- compatible: Should be "brcm,bcm6345-ext-intc".
+- compatible: Should be "brcm,bcm6345-ext-intc" or "brcm,bcm6318-ext-intc".
+- reg: Specifies the base physical addresses and size of the registers.
+- interrupt-controller: identifies the node as an interrupt controller.
+- #interrupt-cells: Specifies the number of cells needed to encode an interrupt
@ -73,7 +73,7 @@ Signed-off-by: Jonas Gorski <jogo@openwrt.org>
obj-$(CONFIG_METAG) += irq-metag-ext.o
--- /dev/null
+++ b/drivers/irqchip/irq-bcm6345-ext.c
@@ -0,0 +1,288 @@
@@ -0,0 +1,301 @@
+/*
+ * 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
@ -119,6 +119,7 @@ Signed-off-by: Jonas Gorski <jogo@openwrt.org>
+ int parent_irq[MAX_IRQS];
+ void __iomem *reg;
+ int shift;
+ unsigned int toggle_clear_on_ack:1;
+};
+
+static void bcm6345_ext_intc_irq_handle(struct irq_desc *desc)
@ -148,8 +149,10 @@ Signed-off-by: Jonas Gorski <jogo@openwrt.org>
+
+ raw_spin_lock(&priv->lock);
+ reg = __raw_readl(priv->reg);
+ reg |= 1 << (hwirq + EXTIRQ_CFG_CLEAR * priv->shift);
+ __raw_writel(reg, priv->reg);
+ __raw_writel(reg | (1 << (hwirq + EXTIRQ_CFG_CLEAR * priv->shift)),
+ priv->reg);
+ if (priv->toggle_clear_on_ack)
+ __raw_writel(reg, priv->reg);
+ raw_spin_unlock(&priv->lock);
+}
+
@ -263,7 +266,8 @@ Signed-off-by: Jonas Gorski <jogo@openwrt.org>
+
+static int __init __bcm6345_ext_intc_init(struct device_node *node,
+ int num_irqs, int *irqs,
+ void __iomem *reg, int shift)
+ void __iomem *reg, int shift,
+ bool toggle_clear_on_ack)
+{
+ struct intc_data *data;
+ unsigned int i;
@ -284,6 +288,7 @@ Signed-off-by: Jonas Gorski <jogo@openwrt.org>
+
+ data->reg = reg;
+ data->shift = shift;
+ data->toggle_clear_on_ack = toggle_clear_on_ack;
+
+ data->chip.name = "bcm6345-ext-intc";
+ data->chip.irq_ack = bcm6345_ext_intc_irq_ack;
@ -314,7 +319,7 @@ Signed-off-by: Jonas Gorski <jogo@openwrt.org>
+void __init bcm6345_ext_intc_init(int num_irqs, int *irqs, void __iomem *reg,
+ int shift)
+{
+ __bcm6345_ext_intc_init(NULL, num_irqs, irqs, reg, shift);
+ __bcm6345_ext_intc_init(NULL, num_irqs, irqs, reg, shift, false);
+}
+
+#ifdef CONFIG_OF
@ -326,6 +331,7 @@ Signed-off-by: Jonas Gorski <jogo@openwrt.org>
+ void __iomem *base;
+ int irqs[MAX_IRQS] = { 0 };
+ u32 shift;
+ bool toggle_clear_on_ack = false;
+
+ num_irqs = of_irq_count(node);
+
@ -335,6 +341,10 @@ Signed-off-by: Jonas Gorski <jogo@openwrt.org>
+ if (of_property_read_u32(node, "brcm,field-width", &shift))
+ shift = 4;
+
+ /* on BCM6318 setting CLEAR seems to continuously mask interrupts */
+ if (of_device_is_compatible(node, "brcm,bcm6318-ext-intc"))
+ toggle_clear_on_ack = true;
+
+ for (i = 0; i < num_irqs; i++) {
+ irqs[i] = irq_of_parse_and_map(node, i);
+ if (!irqs[i]) {
@ -347,7 +357,8 @@ Signed-off-by: Jonas Gorski <jogo@openwrt.org>
+ if (!base)
+ goto out_unmap;
+
+ ret = __bcm6345_ext_intc_init(node, num_irqs, irqs, base, shift);
+ ret = __bcm6345_ext_intc_init(node, num_irqs, irqs, base, shift,
+ toggle_clear_on_ack);
+ if (!ret)
+ return 0;
+out_unmap:
@ -359,6 +370,8 @@ Signed-off-by: Jonas Gorski <jogo@openwrt.org>
+ return ret;
+}
+
+IRQCHIP_DECLARE(bcm6318_ext_intc, "brcm,bcm6318-ext-intc",
+ bcm6345_ext_intc_of_init);
+IRQCHIP_DECLARE(bcm6345_ext_intc, "brcm,bcm6345-ext-intc",
+ bcm6345_ext_intc_of_init);
+#endif