irqchip/apple-aic: Add support for AICv3

Introduce support for the new AICv3 hardware block in t8122 and t603x SoCs.

For AICv3 Apple started provide offsets as device tree properties
suggesting those are not constant anymore like the event register offset
in AICv2. Instead of adding reg entries we provide these as devicetree
properties as well.

Signed-off-by: Janne Grunau <j@jannau.net>

Author: jannau

drivers/irqchip/irq-apple-aic.c

@@ -54,6 +54,7 @@
 #include <linux/irqdomain.h>
 #include <linux/jump_label.h>
 #include <linux/limits.h>
+#include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/slab.h>
 #include <asm/apple_m1_pmu.h>
@@ -251,6 +252,9 @@ struct aic_info {
 	u32 mask_set;
 	u32 mask_clr;
 
+	u32 cap0_off;
+	u32 maxnumirq_off;
+
 	u32 die_stride;
 
 	/* Features */
@@ -288,6 +292,14 @@ static const struct aic_info aic2_info __initconst = {
 	.version	= 2,
 
 	.irq_cfg	= AIC2_IRQ_CFG,
+	.cap0_off	= AIC2_INFO1,
+	.maxnumirq_off	= AIC2_INFO3,
+
+	.fast_ipi	= true,
+};
+
+static const struct aic_info aic3_info __initconst = {
+	.version	= 3,
 
 	.fast_ipi	= true,
 	.local_fast_ipi = true,
@@ -310,6 +322,10 @@ static const struct of_device_id aic_info_match[] = {
 		.compatible = "apple,aic2",
 		.data = &aic2_info,
 	},
+	{
+		.compatible = "apple,aic3",
+		.data = &aic3_info,
+	},
 	{}
 };
 
@@ -624,7 +640,7 @@ static int aic_irq_domain_map(struct irq_domain *id, unsigned int irq,
 	u32 type = FIELD_GET(AIC_EVENT_TYPE, hw);
 	struct irq_chip *chip = &aic_chip;
 
-	if (ic->info.version == 2)
+	if (ic->info.version == 2 || ic->info.version == 3)
 		chip = &aic2_chip;
 
 	if (type == AIC_EVENT_TYPE_IRQ) {
@@ -931,6 +947,7 @@ static void build_fiq_affinity(struct aic_irq_chip *ic, struct device_node *aff)
 
 static int __init aic_of_ic_init(struct device_node *node, struct device_node *parent)
 {
+	int ret;
 	int i, die;
 	u32 off, start_off;
 	void __iomem *regs;
@@ -974,11 +991,24 @@ static int __init aic_of_ic_init(struct device_node *node, struct device_node *p
 
 		break;
 	}
+	case 3:
+		/* read offsets from device tree for aic version 3 */
+		/* extint-baseaddress? */
+		ret = of_property_read_u32(node, "config-offset", &irqc->info.irq_cfg);
+		if (ret < 0)
+			return ret;
+		ret = of_property_read_u32(node, "cap0-offset", &irqc->info.cap0_off);
+		if (ret < 0)
+			return ret;
+		ret = of_property_read_u32(node, "maxnumirq-offset", &irqc->info.maxnumirq_off);
+		if (ret < 0)
+			return ret;
+		fallthrough;
 	case 2: {
 		u32 info1, info3;
 
-		info1 = aic_ic_read(irqc, AIC2_INFO1);
-		info3 = aic_ic_read(irqc, AIC2_INFO3);
+		info1 = aic_ic_read(irqc, irqc->info.cap0_off);
+		info3 = aic_ic_read(irqc, irqc->info.maxnumirq_off);
 
 		irqc->nr_irq = FIELD_GET(AIC2_INFO1_NR_IRQ, info1);
 		irqc->max_irq = FIELD_GET(AIC2_INFO3_MAX_IRQ, info3);
@@ -1048,7 +1078,7 @@ static int __init aic_of_ic_init(struct device_node *node, struct device_node *p
 		off += irqc->info.die_stride;
 	}
 
-	if (irqc->info.version == 2) {
+	if (irqc->info.version == 2 || irqc->info.version == 3) {
 		u32 config = aic_ic_read(irqc, AIC2_CONFIG);
 
 		config |= AIC2_CONFIG_ENABLE;
@@ -1099,3 +1129,4 @@ static int __init aic_of_ic_init(struct device_node *node, struct device_node *p
 
 IRQCHIP_DECLARE(apple_aic, "apple,aic", aic_of_ic_init);
 IRQCHIP_DECLARE(apple_aic2, "apple,aic2", aic_of_ic_init);
+IRQCHIP_DECLARE(apple_aic3, "apple,aic3", aic_of_ic_init);