irqchip/loongson-liointc: irqchip add 2.0 version

Add IO interrupt controller support for Loongson-2K1000, different
from the Loongson-3A series is that Loongson-2K1000 has 64 interrupt
sources, 0-31 correspond to the device tree liointc0 device node, and
the other correspond to liointc1 node.
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Qing Zhang <zhangqing@loongson.cn>
Tested-by: Ming Wang <wangming01@loongson.cn>
Acked-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

drivers/irqchip/irq-loongson-liointc.c

@@ -20,6 +20,7 @@
 
 #define LIOINTC_CHIP_IRQ	32
 #define LIOINTC_NUM_PARENT 4
+#define LIOINTC_NUM_CORES	4
 
 #define LIOINTC_INTC_CHIP_START	0x20
 
@@ -42,6 +43,7 @@ struct liointc_handler_data {
 struct liointc_priv {
 	struct irq_chip_generic		*gc;
 	struct liointc_handler_data	handler[LIOINTC_NUM_PARENT];
+	void __iomem			*core_isr[LIOINTC_NUM_CORES];
 	u8				map_cache[LIOINTC_CHIP_IRQ];
 	bool				has_lpc_irq_errata;
 };
@@ -51,11 +53,12 @@ static void liointc_chained_handle_irq(struct irq_desc *desc)
 	struct liointc_handler_data *handler = irq_desc_get_handler_data(desc);
 	struct irq_chip *chip = irq_desc_get_chip(desc);
 	struct irq_chip_generic *gc = handler->priv->gc;
+	int core = get_ebase_cpunum() % LIOINTC_NUM_CORES;
 	u32 pending;
 
 	chained_irq_enter(chip, desc);
 
-	pending = readl(gc->reg_base + LIOINTC_REG_INTC_STATUS);
+	pending = readl(handler->priv->core_isr[core]);
 
 	if (!pending) {
 		/* Always blame LPC IRQ if we have that bug */
@@ -141,6 +144,18 @@ static void liointc_resume(struct irq_chip_generic *gc)
 }
 
 static const char * const parent_names[] = {"int0", "int1", "int2", "int3"};
+static const char * const core_reg_names[] = {"isr0", "isr1", "isr2", "isr3"};
+
+static void __iomem *liointc_get_reg_byname(struct device_node *node,
+						const char *name)
+{
+	int index = of_property_match_string(node, "reg-names", name);
+
+	if (index < 0)
+		return NULL;
+
+	return of_iomap(node, index);
+}
 
 static int __init liointc_of_init(struct device_node *node,
 				  struct device_node *parent)
@@ -159,12 +174,30 @@ static int __init liointc_of_init(struct device_node *node,
 	if (!priv)
 		return -ENOMEM;
 
+	if (of_device_is_compatible(node, "loongson,liointc-2.0")) {
+		base = liointc_get_reg_byname(node, "main");
+		if (!base) {
+			err = -ENODEV;
+			goto out_free_priv;
+		}
+
+		for (i = 0; i < LIOINTC_NUM_CORES; i++)
+			priv->core_isr[i] = liointc_get_reg_byname(node, core_reg_names[i]);
+		if (!priv->core_isr[0]) {
+			err = -ENODEV;
+			goto out_iounmap_base;
+		}
+	} else {
 		base = of_iomap(node, 0);
 		if (!base) {
 			err = -ENODEV;
 			goto out_free_priv;
 		}
 
+		for (i = 0; i < LIOINTC_NUM_CORES; i++)
+			priv->core_isr[i] = base + LIOINTC_REG_INTC_STATUS;
+	}
+
 	for (i = 0; i < LIOINTC_NUM_PARENT; i++) {
 		parent_irq[i] = of_irq_get_byname(node, parent_names[i]);
 		if (parent_irq[i] > 0)
@@ -172,7 +205,7 @@ static int __init liointc_of_init(struct device_node *node,
 	}
 	if (!have_parent) {
 		err = -ENODEV;
-		goto out_iounmap;
+		goto out_iounmap_isr;
 	}
 
 	sz = of_property_read_variable_u32_array(node,
@@ -183,7 +216,7 @@ static int __init liointc_of_init(struct device_node *node,
 	if (sz < 4) {
 		pr_err("loongson-liointc: No parent_int_map\n");
 		err = -ENODEV;
-		goto out_iounmap;
+		goto out_iounmap_isr;
 	}
 
 	for (i = 0; i < LIOINTC_NUM_PARENT; i++)
@@ -195,7 +228,7 @@ static int __init liointc_of_init(struct device_node *node,
 	if (!domain) {
 		pr_err("loongson-liointc: cannot add IRQ domain\n");
 		err = -EINVAL;
-		goto out_iounmap;
+		goto out_iounmap_isr;
 	}
 
 	err = irq_alloc_domain_generic_chips(domain, 32, 1,
@@ -260,7 +293,13 @@ static int __init liointc_of_init(struct device_node *node,
 
 out_free_domain:
 	irq_domain_remove(domain);
-out_iounmap:
+out_iounmap_isr:
+	for (i = 0; i < LIOINTC_NUM_CORES; i++) {
+		if (!priv->core_isr[i])
+			continue;
+		iounmap(priv->core_isr[i]);
+	}
+out_iounmap_base:
 	iounmap(base);
 out_free_priv:
 	kfree(priv);
@@ -270,3 +309,4 @@ static int __init liointc_of_init(struct device_node *node,
 
 IRQCHIP_DECLARE(loongson_liointc_1_0, "loongson,liointc-1.0", liointc_of_init);
 IRQCHIP_DECLARE(loongson_liointc_1_0a, "loongson,liointc-1.0a", liointc_of_init);
+IRQCHIP_DECLARE(loongson_liointc_2_0, "loongson,liointc-2.0", liointc_of_init);