ARCv2: IDU-intc: Use build registers for getting numbers of interrupts

This enhancement is needed to allow masking all available common interrupts
in IDU interrupt controller in boot time since the kernel can
discover a number of them from the build register. Also now there
is no need to specify in device tree a list of used core interrupts
by IDU. E.g. before:

    idu_intc: idu-interrupt-controller {
        compatible = "snps,archs-idu-intc";
        interrupt-controller;
        interrupt-parent = <&core_intc>;
        #interrupt-cells = <2>;
        interrupts = <24 25 26 27 28 29 30 31>;
    };

and after:

    idu_intc: idu-interrupt-controller {
        compatible = "snps,archs-idu-intc";
        interrupt-controller;
        interrupt-parent = <&core_intc>;
        #interrupt-cells = <2>;
    };

Signed-off-by: Yuriy Kolerov <yuriy.kolerov@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

2 files changed, 26 insertions, 10 deletions

diff --git a/arch/arc/kernel/mcip.c b/arch/arc/kernel/mcip.c
index 9f6b68fd4f3b..21dc89704113 100644
--- a/arch/arc/kernel/mcip.c
+++ b/arch/arc/kernel/mcip.c
@@ -230,14 +230,12 @@ static struct irq_chip idu_irq_chip = {
 
 };
 
-static irq_hw_number_t idu_first_hwirq;
-
 static void idu_cascade_isr(struct irq_desc *desc)
 {
         struct irq_domain *idu_domain = irq_desc_get_handler_data(desc);
         struct irq_chip *core_chip = irq_desc_get_chip(desc);
         irq_hw_number_t core_hwirq = irqd_to_hwirq(irq_desc_get_irq_data(desc));
-        irq_hw_number_t idu_hwirq = core_hwirq - idu_first_hwirq;
+        irq_hw_number_t idu_hwirq = core_hwirq - FIRST_EXT_IRQ;
 
         chained_irq_enter(core_chip, desc);
         generic_handle_irq(irq_find_mapping(idu_domain, idu_hwirq));
@@ -283,17 +281,20 @@ static int __init
 idu_of_init(struct device_node *intc, struct device_node *parent)
 {
         struct irq_domain *domain;
-        /* Read IDU BCR to confirm nr_irqs */
-        int nr_irqs = of_irq_count(intc);
+        int nr_irqs;
         int i, virq;
         struct mcip_bcr mp;
+        struct mcip_idu_bcr idu_bcr;
 
         READ_BCR(ARC_REG_MCIP_BCR, mp);
 
         if (!mp.idu)
                 panic("IDU not detected, but DeviceTree using it");
 
-        pr_info("MCIP: IDU referenced from Devicetree %d irqs\n", nr_irqs);
+        READ_BCR(ARC_REG_MCIP_IDU_BCR, idu_bcr);
+        nr_irqs = mcip_idu_bcr_to_nr_irqs(idu_bcr);
+
+        pr_info("MCIP: IDU supports %u common irqs\n", nr_irqs);
 
         domain = irq_domain_add_linear(intc, nr_irqs, &idu_irq_ops, NULL);
 
@@ -306,10 +307,8 @@ idu_of_init(struct device_node *intc, struct device_node *parent)
                  * however we need it to get the parent virq and set IDU handler
                  * as first level isr
                  */
-                virq = irq_of_parse_and_map(intc, i);
-                if (!i)
-                        idu_first_hwirq = irqd_to_hwirq(irq_get_irq_data(virq));
-
+                virq = irq_create_mapping(NULL, i + FIRST_EXT_IRQ);
+                BUG_ON(!virq);
                 irq_set_chained_handler_and_data(virq, idu_cascade_isr, domain);
         }
 
diff --git a/include/soc/arc/mcip.h b/include/soc/arc/mcip.h
index 4b6b489a8d7c..c2d1b15da136 100644
--- a/include/soc/arc/mcip.h
+++ b/include/soc/arc/mcip.h
@@ -14,6 +14,7 @@
 #include <soc/arc/aux.h>
 
 #define ARC_REG_MCIP_BCR        0x0d0
+#define ARC_REG_MCIP_IDU_BCR    0x0D5
 #define ARC_REG_MCIP_CMD        0x600
 #define ARC_REG_MCIP_WDATA      0x601
 #define ARC_REG_MCIP_READBACK   0x602
@@ -69,6 +70,22 @@ struct mcip_bcr {
 #endif
 };
 
+struct mcip_idu_bcr {
+#ifdef CONFIG_CPU_BIG_ENDIAN
+        unsigned int pad:21, cirqnum:3, ver:8;
+#else
+        unsigned int ver:8, cirqnum:3, pad:21;
+#endif
+};
+
+
+/*
+ * Build register for IDU contains not an actual number of supported common
+ * interrupts but an exponent of 2 which must be multiplied by 4 to
+ * get a number of supported common interrupts.
+ */
+#define mcip_idu_bcr_to_nr_irqs(bcr) (4 * (1 << (bcr).cirqnum))
+
 /*
  * MCIP programming model
  *