Add IO interrupt controller support for Loongson 2k1000, different
from the 3a series is that 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 <redacted>
---

v2-v3: No change

 drivers/irqchip/irq-loongson-liointc.c | 55 +++++++++++++++++++++-----
 1 file changed, 46 insertions(+), 9 deletions(-)

diff --git a/drivers/irqchip/irq-loongson-liointc.c b/drivers/irqchip/irq-loongson-liointc.c
index 09b91b81851c..1c3c80f7f9f5 100644
--- a/drivers/irqchip/irq-loongson-liointc.c
+++ b/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 +144,15 @@ 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);
+
+	return of_iomap(node, index);

+}
 
 static int __init liointc_of_init(struct device_node *node,
 				  struct device_node *parent)

@@ -159,10 +171,28 @@ static int __init liointc_of_init(struct device_node *node,
 	if (!priv)
 		return -ENOMEM;
 
-	base = of_iomap(node, 0);
-	if (!base) {
-		err = -ENODEV;
-		goto out_free_priv;
+	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]);