MIPS: Netlogic: Add XLP PIC irqdomain

Add a legacy irq domain for the XLP PIC interrupts. This will be used
when interrupts are assigned from the device tree. This change is required
after commit c5cdc67 "irqdomain: Remove temporary MIPS workaround code".

Signed-off-by: Jayachandran C <jchandra@broadcom.com>
Cc: linux-mips@linux-mips.org
Cc: Jayachandran C <jchandra@broadcom.com>
Patchwork: https://patchwork.linux-mips.org/patch/5597/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

3 files changed, 61 insertions, 13 deletions

diff --git a/arch/mips/netlogic/common/irq.c b/arch/mips/netlogic/common/irq.c
index 73facb2b33bb..1c7e3a1b81ab 100644
--- a/arch/mips/netlogic/common/irq.c
+++ b/arch/mips/netlogic/common/irq.c
@@ -40,6 +40,10 @@
 #include <linux/slab.h>
 #include <linux/irq.h>
 
+#include <linux/irqdomain.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+
 #include <asm/errno.h>
 #include <asm/signal.h>
 #include <asm/ptrace.h>
@@ -223,17 +227,6 @@ static void nlm_init_node_irqs(int node)
         nodep->irqmask = irqmask;
 }
 
-void __init arch_init_irq(void)
-{
-        /* Initialize the irq descriptors */
-        nlm_init_percpu_irqs();
-        nlm_init_node_irqs(0);
-        write_c0_eimr(nlm_current_node()->irqmask);
-#if defined(CONFIG_CPU_XLR)
-        nlm_setup_fmn_irq();
-#endif
-}
-
 void nlm_smp_irq_init(int hwcpuid)
 {
         int node, cpu;
@@ -266,3 +259,56 @@ asmlinkage void plat_irq_dispatch(void)
         /* top level irq handling */
         do_IRQ(nlm_irq_to_xirq(node, i));
 }
+
+#ifdef CONFIG_OF
+static struct irq_domain *xlp_pic_domain;
+
+static const struct irq_domain_ops xlp_pic_irq_domain_ops = {
+        .xlate = irq_domain_xlate_onetwocell,
+};
+
+static int __init xlp_of_pic_init(struct device_node *node,
+                                        struct device_node *parent)
+{
+        const int n_picirqs = PIC_IRT_LAST_IRQ - PIC_IRQ_BASE + 1;
+        struct resource res;
+        int socid, ret;
+
+        /* we need a hack to get the PIC's SoC chip id */
+        ret = of_address_to_resource(node, 0, &res);
+        if (ret < 0) {
+                pr_err("PIC %s: reg property not found!\n", node->name);
+                return -EINVAL;
+        }
+        socid = (res.start >> 18) & 0x3;
+        xlp_pic_domain = irq_domain_add_legacy(node, n_picirqs,
+                nlm_irq_to_xirq(socid, PIC_IRQ_BASE), PIC_IRQ_BASE,
+                &xlp_pic_irq_domain_ops, NULL);
+        if (xlp_pic_domain == NULL) {
+                pr_err("PIC %s: Creating legacy domain failed!\n", node->name);
+                return -EINVAL;
+        }
+        pr_info("Node %d: IRQ domain created for PIC@%pa\n", socid,
+                                                        &res.start);
+        return 0;
+}
+
+static struct of_device_id __initdata xlp_pic_irq_ids[] = {
+        { .compatible = "netlogic,xlp-pic", .data = xlp_of_pic_init },
+        {},
+};
+#endif
+
+void __init arch_init_irq(void)
+{
+        /* Initialize the irq descriptors */
+        nlm_init_percpu_irqs();
+        nlm_init_node_irqs(0);
+        write_c0_eimr(nlm_current_node()->irqmask);
+#if defined(CONFIG_CPU_XLR)
+        nlm_setup_fmn_irq();
+#endif
+#if defined(CONFIG_OF)
+        of_irq_init(xlp_pic_irq_ids);
+#endif
+}
diff --git a/arch/mips/netlogic/dts/xlp_evp.dts b/arch/mips/netlogic/dts/xlp_evp.dts
index e14f42308064..06407033678e 100644
--- a/arch/mips/netlogic/dts/xlp_evp.dts
+++ b/arch/mips/netlogic/dts/xlp_evp.dts
@@ -76,10 +76,11 @@
                         };
                 };
                 pic: pic@4000 {
-                        interrupt-controller;
+                        compatible = "netlogic,xlp-pic";
                         #address-cells = <0>;
                         #interrupt-cells = <1>;
                         reg = <0 0x4000 0x200>;
+                        interrupt-controller;
                 };
 
                 nor_flash@1,0 {
diff --git a/arch/mips/netlogic/dts/xlp_svp.dts b/arch/mips/netlogic/dts/xlp_svp.dts
index 8af4bdbe5d99..9c5db102df53 100644
--- a/arch/mips/netlogic/dts/xlp_svp.dts
+++ b/arch/mips/netlogic/dts/xlp_svp.dts
@@ -76,10 +76,11 @@
                         };
                 };
                 pic: pic@4000 {
-                        interrupt-controller;
+                        compatible = "netlogic,xlp-pic";
                         #address-cells = <0>;
                         #interrupt-cells = <1>;
                         reg = <0 0x4000 0x200>;
+                        interrupt-controller;
                 };
 
                 nor_flash@1,0 {