ARM: davinci: cp_intc: Add irq domain support

Add irq domain support for DaVinci cp_intc.

Boot tested on AM18x EVM. Also tested with GPIO IRQ support on
AM18x EVM.

Signed-off-by: Heiko Schocher <hs@denx.de>
Cc: davinci-linux-open-source@linux.davincidsp.com
Cc: linux-arm-kernel@lists.infradead.org
Cc: devicetree-discuss@lists.ozlabs.org
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Sekhar Nori <nsekhar@ti.com>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Sergei Shtylyov <sshtylyov@mvista.com>
[nsekhar@ti.com: add commit description, select IRQ_DOMAIN for CP_INTC
in Kconfig]
Signed-off-by: Sekhar Nori <nsekhar@ti.com>

2 files changed, 50 insertions, 14 deletions

diff --git a/arch/arm/mach-davinci/Kconfig b/arch/arm/mach-davinci/Kconfig
index 32d837d8eab9..2ce1ef07c13d 100644
--- a/arch/arm/mach-davinci/Kconfig
+++ b/arch/arm/mach-davinci/Kconfig
@@ -4,6 +4,7 @@ config AINTC
         bool
 
 config CP_INTC
+        select IRQ_DOMAIN
         bool
 
 config ARCH_DAVINCI_DMx
diff --git a/arch/arm/mach-davinci/cp_intc.c b/arch/arm/mach-davinci/cp_intc.c
index f83152d643c5..45d52567ced7 100644
--- a/arch/arm/mach-davinci/cp_intc.c
+++ b/arch/arm/mach-davinci/cp_intc.c
@@ -9,8 +9,10 @@
  * kind, whether express or implied.
  */
 
+#include <linux/export.h>
 #include <linux/init.h>
 #include <linux/irq.h>
+#include <linux/irqdomain.h>
 #include <linux/io.h>
 
 #include <mach/common.h>
@@ -28,7 +30,7 @@ static inline void cp_intc_write(unsigned long value, unsigned offset)
 
 static void cp_intc_ack_irq(struct irq_data *d)
 {
-        cp_intc_write(d->irq, CP_INTC_SYS_STAT_IDX_CLR);
+        cp_intc_write(d->hwirq, CP_INTC_SYS_STAT_IDX_CLR);
 }
 
 /* Disable interrupt */
@@ -36,20 +38,20 @@ static void cp_intc_mask_irq(struct irq_data *d)
 {
         /* XXX don't know why we need to disable nIRQ here... */
         cp_intc_write(1, CP_INTC_HOST_ENABLE_IDX_CLR);
-        cp_intc_write(d->irq, CP_INTC_SYS_ENABLE_IDX_CLR);
+        cp_intc_write(d->hwirq, CP_INTC_SYS_ENABLE_IDX_CLR);
         cp_intc_write(1, CP_INTC_HOST_ENABLE_IDX_SET);
 }
 
 /* Enable interrupt */
 static void cp_intc_unmask_irq(struct irq_data *d)
 {
-        cp_intc_write(d->irq, CP_INTC_SYS_ENABLE_IDX_SET);
+        cp_intc_write(d->hwirq, CP_INTC_SYS_ENABLE_IDX_SET);
 }
 
 static int cp_intc_set_irq_type(struct irq_data *d, unsigned int flow_type)
 {
-        unsigned reg            = BIT_WORD(d->irq);
-        unsigned mask           = BIT_MASK(d->irq);
+        unsigned reg            = BIT_WORD(d->hwirq);
+        unsigned mask           = BIT_MASK(d->hwirq);
         unsigned polarity       = cp_intc_read(CP_INTC_SYS_POLARITY(reg));
         unsigned type           = cp_intc_read(CP_INTC_SYS_TYPE(reg));
 
@@ -99,18 +101,36 @@ static struct irq_chip cp_intc_irq_chip = {
         .irq_set_wake   = cp_intc_set_wake,
 };
 
-void __init cp_intc_init(void)
+static struct irq_domain *cp_intc_domain;
+
+static int cp_intc_host_map(struct irq_domain *h, unsigned int virq,
+                          irq_hw_number_t hw)
+{
+        pr_debug("cp_intc_host_map(%d, 0x%lx)\n", virq, hw);
+
+        irq_set_chip(virq, &cp_intc_irq_chip);
+        set_irq_flags(virq, IRQF_VALID | IRQF_PROBE);
+        irq_set_handler(virq, handle_edge_irq);
+        return 0;
+}
+
+static const struct irq_domain_ops cp_intc_host_ops = {
+        .map = cp_intc_host_map,
+        .xlate = irq_domain_xlate_onetwocell,
+};
+
+int __init __cp_intc_init(struct device_node *node)
 {
-        unsigned long num_irq   = davinci_soc_info.intc_irq_num;
+        u32 num_irq             = davinci_soc_info.intc_irq_num;
         u8 *irq_prio            = davinci_soc_info.intc_irq_prios;
         u32 *host_map           = davinci_soc_info.intc_host_map;
         unsigned num_reg        = BITS_TO_LONGS(num_irq);
-        int i;
+        int i, irq_base;
 
         davinci_intc_type = DAVINCI_INTC_TYPE_CP_INTC;
         davinci_intc_base = ioremap(davinci_soc_info.intc_base, SZ_8K);
         if (WARN_ON(!davinci_intc_base))
-                return;
+                return -EINVAL;
 
         cp_intc_write(0, CP_INTC_GLOBAL_ENABLE);
 
@@ -165,13 +185,28 @@ void __init cp_intc_init(void)
                 for (i = 0; host_map[i] != -1; i++)
                         cp_intc_write(host_map[i], CP_INTC_HOST_MAP(i));
 
-        /* Set up genirq dispatching for cp_intc */
-        for (i = 0; i < num_irq; i++) {
-                irq_set_chip(i, &cp_intc_irq_chip);
-                set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
-                irq_set_handler(i, handle_edge_irq);
+        irq_base = irq_alloc_descs(-1, 0, num_irq, 0);
+        if (irq_base < 0) {
+                pr_warn("Couldn't allocate IRQ numbers\n");
+                irq_base = 0;
+        }
+
+        /* create a legacy host */
+        cp_intc_domain = irq_domain_add_legacy(node, num_irq,
+                                        irq_base, 0, &cp_intc_host_ops, NULL);
+
+        if (!cp_intc_domain) {
+                pr_err("cp_intc: failed to allocate irq host!\n");
+                return -EINVAL;
         }
 
         /* Enable global interrupt */
         cp_intc_write(1, CP_INTC_GLOBAL_ENABLE);
+
+        return 0;
+}
+
+void __init cp_intc_init(void)
+{
+        __cp_intc_init(NULL);
 }