ARM: sa1111: implement support for sparse IRQs

Implement the necessary allocation/freeing functionality to support
sparse IRQs with the SA-1111 device.  On non-sparse IRQ platforms,
this allows us to dynamically allocate from within the available IRQ
number space.

Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 32 insertions, 11 deletions

diff --git a/arch/arm/common/sa1111.c b/arch/arm/common/sa1111.c
index d3a8f5e26487..b64a3360c8c2 100644
--- a/arch/arm/common/sa1111.c
+++ b/arch/arm/common/sa1111.c
@@ -16,6 +16,7 @@
  */
 #include <linux/module.h>
 #include <linux/init.h>
+#include <linux/irq.h>
 #include <linux/kernel.h>
 #include <linux/delay.h>
 #include <linux/errno.h>
@@ -28,9 +29,8 @@
 #include <linux/io.h>
 
 #include <mach/hardware.h>
-#include <asm/mach-types.h>
-#include <asm/irq.h>
 #include <asm/mach/irq.h>
+#include <asm/mach-types.h>
 #include <asm/sizes.h>
 
 #include <asm/hardware/sa1111.h>
@@ -86,6 +86,7 @@
 #define IRQ_S1_CD_VALID         (52)
 #define IRQ_S0_BVD1_STSCHG      (53)
 #define IRQ_S1_BVD1_STSCHG      (54)
+#define SA1111_IRQ_NR           (55)
 
 extern void sa1110_mb_enable(void);
 extern void sa1110_mb_disable(void);
@@ -435,16 +436,28 @@ static struct irq_chip sa1111_high_chip = {
         .irq_set_wake   = sa1111_wake_highirq,
 };
 
-static void sa1111_setup_irq(struct sa1111 *sachip)
+static int sa1111_setup_irq(struct sa1111 *sachip, unsigned irq_base)
 {
         void __iomem *irqbase = sachip->base + SA1111_INTC;
         unsigned i, irq;
+        int ret;
 
         /*
          * We're guaranteed that this region hasn't been taken.
          */
         request_mem_region(sachip->phys + SA1111_INTC, 512, "irq");
 
+        ret = irq_alloc_descs(-1, irq_base, SA1111_IRQ_NR, -1);
+        if (ret <= 0) {
+                dev_err(sachip->dev, "unable to allocate %u irqs: %d\n",
+                        SA1111_IRQ_NR, ret);
+                if (ret == 0)
+                        ret = -EINVAL;
+                return ret;
+        }
+
+        sachip->irq_base = ret;
+
         /* disable all IRQs */
         sa1111_writel(0, irqbase + SA1111_INTEN0);
         sa1111_writel(0, irqbase + SA1111_INTEN1);
@@ -486,6 +499,11 @@ static void sa1111_setup_irq(struct sa1111 *sachip)
         irq_set_irq_type(sachip->irq, IRQ_TYPE_EDGE_RISING);
         irq_set_handler_data(sachip->irq, sachip);
         irq_set_chained_handler(sachip->irq, sa1111_irq_handler);
+
+        dev_info(sachip->dev, "Providing IRQ%u-%u\n",
+                sachip->irq_base, sachip->irq_base + SA1111_IRQ_NR - 1);
+
+        return 0;
 }
 
 /*
@@ -740,7 +758,6 @@ __sa1111_probe(struct device *me, struct resource *mem, int irq)
 
         sachip->phys = mem->start;
         sachip->irq = irq;
-        sachip->irq_base = pd->irq_base;
 
         /*
          * Map the whole region.  This also maps the
@@ -771,6 +788,16 @@ __sa1111_probe(struct device *me, struct resource *mem, int irq)
          */
         sa1111_wake(sachip);
 
+        /*
+         * The interrupt controller must be initialised before any
+         * other device to ensure that the interrupts are available.
+         */
+        if (sachip->irq != NO_IRQ) {
+                ret = sa1111_setup_irq(sachip, pd->irq_base);
+                if (ret)
+                        goto err_unmap;
+        }
+
 #ifdef CONFIG_ARCH_SA1100
         {
         unsigned int val;
@@ -801,13 +828,6 @@ __sa1111_probe(struct device *me, struct resource *mem, int irq)
         }
 #endif
 
-        /*
-         * The interrupt controller must be initialised before any
-         * other device to ensure that the interrupts are available.
-         */
-        if (sachip->irq != NO_IRQ)
-                sa1111_setup_irq(sachip);
-
         g_sa1111 = sachip;
 
         has_devs = ~0;
@@ -858,6 +878,7 @@ static void __sa1111_remove(struct sa1111 *sachip)
         if (sachip->irq != NO_IRQ) {
                 irq_set_chained_handler(sachip->irq, NULL);
                 irq_set_handler_data(sachip->irq, NULL);
+                irq_free_descs(sachip->irq_base, SA1111_IRQ_NR);
 
                 release_mem_region(sachip->phys + SA1111_INTC, 512);
         }