ath79: fix irq-ath79-intc driver and add support for other ath79 SoCs

Add the missing enable and disable function.
Remove dummy mask and unmask function and use the one provided by
irq_dummy_chip.
Allow interrupt status register being defined from dts.
Add ddr_wb_flush for ar934x/qca953x.
Rename controller name to qca,ar9340-intc because this design was
first introduced in AR934x.

Signed-off-by: Chuanhong Guo <gch981213@gmail.com>

Signed-off-by: Johann Neuhauser <johann@it-neuhauser.de>

target/linux/ath79/patches-4.14/0007-irqchip-irq-ath79-intc-add-irq-cascade-driver-for-QC.patch

@@ -23,7 +23,7 @@ Signed-off-by: John Crispin <john@phrozen.org>
  obj-$(CONFIG_ARCH_BCM2835)		+= irq-bcm2836.o
 --- /dev/null
 +++ b/drivers/irqchip/irq-ath79-intc.c
-@@ -0,0 +1,104 @@
+@@ -0,0 +1,142 @@
 +/*
 + *  Atheros AR71xx/AR724x/AR913x specific interrupt handling
 + *
@@ -50,7 +50,9 @@ Signed-off-by: John Crispin <john@phrozen.org>
 +	struct irq_chip chip;
 +	u32 irq;
 +	u32 pending_mask;
++	u32 int_status;
 +	u32 irq_mask[ATH79_MAX_INTC_CASCADE];
++	u32 irq_wb_chan[ATH79_MAX_INTC_CASCADE];
 +};
 +
 +static void ath79_intc_irq_handler(struct irq_desc *desc)
@@ -59,26 +61,33 @@ Signed-off-by: John Crispin <john@phrozen.org>
 +	struct ath79_intc *intc = domain->host_data;
 +	u32 pending;
 +
-+	pending = ath79_reset_rr(QCA955X_RESET_REG_EXT_INT_STATUS);
++	pending = ath79_reset_rr(intc->int_status);
 +	pending &= intc->pending_mask;
 +
 +	if (pending) {
 +		int i;
 +
 +		for (i = 0; i < domain->hwirq_max; i++)
-+			if (pending & intc->irq_mask[i])
++			if (pending & intc->irq_mask[i]) {
++				if (intc->irq_wb_chan[i] != 0xffffffff)
++					ath79_ddr_wb_flush(intc->irq_wb_chan[i]);
 +				generic_handle_irq(irq_find_mapping(domain, i));
++			}
 +	} else {
 +		spurious_interrupt();
 +	}
 +}
 +
-+static void ath79_intc_irq_unmask(struct irq_data *d)
++static void ath79_intc_irq_enable(struct irq_data *d)
 +{
++	struct ath79_intc *intc = d->domain->host_data;
++	enable_irq(intc->irq);
 +}
 +
-+static void ath79_intc_irq_mask(struct irq_data *d)
++static void ath79_intc_irq_disable(struct irq_data *d)
 +{
++	struct ath79_intc *intc = d->domain->host_data;
++	disable_irq(intc->irq);
 +}
 +
 +static int ath79_intc_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw)
@@ -95,27 +104,56 @@ Signed-off-by: John Crispin <john@phrozen.org>
 +	.map = ath79_intc_map,
 +};
 +
-+static int __init qca9556_intc_of_init(
++static int __init ath79_intc_of_init(
 +	struct device_node *node, struct device_node *parent)
 +{
 +	struct irq_domain *domain;
 +	struct ath79_intc *intc;
-+	int cnt, i;
++	int cnt, cntwb, i, err;
 +
-+	cnt = of_property_count_u32_elems(node, "qcom,pending-bits");
++	cnt = of_property_count_u32_elems(node, "qca,pending-bits");
 +	if (cnt > ATH79_MAX_INTC_CASCADE)
 +		panic("Too many INTC pending bits\n");
 +
 +	intc = kzalloc(sizeof(*intc), GFP_KERNEL);
 +	if (!intc)
 +		panic("Failed to allocate INTC memory\n");
++	intc->chip = dummy_irq_chip;
 +	intc->chip.name = "INTC";
-+	intc->chip.irq_unmask = ath79_intc_irq_unmask,
-+	intc->chip.irq_mask = ath79_intc_irq_mask,
++	intc->chip.irq_disable = ath79_intc_irq_disable;
++	intc->chip.irq_enable = ath79_intc_irq_enable;
++
++	if (of_property_read_u32(node, "qca,int-status-addr", &intc->int_status) < 0) {
++		panic("Missing address of interrupt status register\n");
++	}
 +
-+	of_property_read_u32_array(node, "qcom,pending-bits", intc->irq_mask, cnt);
-+	for (i = 0; i < cnt; i++)
++	of_property_read_u32_array(node, "qca,pending-bits", intc->irq_mask, cnt);
++	for (i = 0; i < cnt; i++) {
 +		intc->pending_mask |= intc->irq_mask[i];
++		intc->irq_wb_chan[i] = 0xffffffff;
++	}
++
++	cntwb = of_count_phandle_with_args(
++		node, "qca,ddr-wb-channels", "#qca,ddr-wb-channel-cells");
++
++	for (i = 0; i < cntwb; i++) {
++		struct of_phandle_args args;
++		u32 irq = i;
++
++		of_property_read_u32_index(
++			node, "qca,ddr-wb-channel-interrupts", i, &irq);
++		if (irq >= ATH79_MAX_INTC_CASCADE)
++			continue;
++
++		err = of_parse_phandle_with_args(
++			node, "qca,ddr-wb-channels",
++			"#qca,ddr-wb-channel-cells",
++			i, &args);
++		if (err)
++			return err;
++
++		intc->irq_wb_chan[irq] = args.args[0];
++	}
 +
 +	intc->irq = irq_of_parse_and_map(node, 0);
 +	if (!intc->irq)
@@ -126,5 +164,5 @@ Signed-off-by: John Crispin <john@phrozen.org>
 +
 +	return 0;
 +}
-+IRQCHIP_DECLARE(qca9556_intc, "qcom,qca9556-intc",
-+		qca9556_intc_of_init);
++IRQCHIP_DECLARE(ath79_intc, "qca,ar9340-intc",
++		ath79_intc_of_init);