arm/tegra: convert tegra20 to GIC devicetree binding

Convert tegra20 IRQ intialization to the GIC devicetree binding. Modify the
interrupt definitions in the dts files according to
Documentation/devicetree/bindings/arm/gic.txt

v3 (swarren):
* Moved of_irq_init() call into board-dt.c to avoid ifdef'ing it.
  - Even with a dummy replacement if !CONFIG_OF, the reference from
    tegra_dt_irq_match[] to gic_of_init() would still have to be ifdef'd
  - It's plausible that tegra_dt_irq_match[] may need to contain more
    entries in the future, and defining what they are seems more suitable
    for board-dt.c than irq.c
v2 (swarren):
* Removed some stale GIC init code from board-dt.c
* Undid some accidental 0x -> 0x0 search/replace.

Signed-off-by: Peter De Schrijver <pdeschrijver@nvidia.com>
Acked-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
[olof: added include of <asm/hardware/gic.h> for compile to pass]
Signed-off-by: Olof Johansson <olof@lixom.net>

2 files changed, 21 insertions, 14 deletions

diff --git a/arch/arm/mach-tegra/board-dt.c b/arch/arm/mach-tegra/board-dt.c
index ba27c13e44e0..2fa599da7deb 100644
--- a/arch/arm/mach-tegra/board-dt.c
+++ b/arch/arm/mach-tegra/board-dt.c
@@ -36,6 +36,7 @@
 #include <asm/mach/arch.h>
 #include <asm/mach/time.h>
 #include <asm/setup.h>
+#include <asm/hardware/gic.h>
 
 #include <mach/iomap.h>
 #include <mach/irqs.h>
@@ -51,6 +52,17 @@ void seaboard_pinmux_init(void);
 void trimslice_pinmux_init(void);
 void ventana_pinmux_init(void);
 
+static const struct of_device_id tegra_dt_irq_match[] __initconst = {
+        { .compatible = "arm,cortex-a9-gic", .data = gic_of_init },
+        { }
+};
+
+void __init tegra_dt_init_irq(void)
+{
+        tegra_init_irq();
+        of_irq_init(tegra_dt_irq_match);
+}
+
 struct of_dev_auxdata tegra20_auxdata_lookup[] __initdata = {
         OF_DEV_AUXDATA("nvidia,tegra20-sdhci", TEGRA_SDMMC1_BASE, "sdhci-tegra.0", NULL),
         OF_DEV_AUXDATA("nvidia,tegra20-sdhci", TEGRA_SDMMC2_BASE, "sdhci-tegra.1", NULL),
@@ -91,11 +103,6 @@ static struct of_device_id tegra_dt_match_table[] __initdata = {
         {}
 };
 
-static struct of_device_id tegra_dt_gic_match[] __initdata = {
-        { .compatible = "nvidia,tegra20-gic", },
-        {}
-};
-
 static struct {
         char *machine;
         void (*init)(void);
@@ -109,14 +116,8 @@ static struct {
 
 static void __init tegra_dt_init(void)
 {
-        struct device_node *node;
         int i;
 
-        node = of_find_matching_node_by_address(NULL, tegra_dt_gic_match,
-                                                TEGRA_ARM_INT_DIST_BASE);
-        if (node)
-                irq_domain_add_simple(node, INT_GIC_BASE);
-
         tegra_clk_init_from_table(tegra_dt_clk_init_table);
 
         /*
@@ -149,7 +150,7 @@ static const char * tegra_dt_board_compat[] = {
 DT_MACHINE_START(TEGRA_DT, "nVidia Tegra (Flattened Device Tree)")
         .map_io         = tegra_map_common_io,
         .init_early     = tegra_init_early,
-        .init_irq       = tegra_init_irq,
+        .init_irq       = tegra_dt_init_irq,
         .timer          = &tegra_timer,
         .init_machine   = tegra_dt_init,
         .dt_compat      = tegra_dt_board_compat,
diff --git a/arch/arm/mach-tegra/irq.c b/arch/arm/mach-tegra/irq.c
index 4956c3cea731..004b0fdf0d76 100644
--- a/arch/arm/mach-tegra/irq.c
+++ b/arch/arm/mach-tegra/irq.c
@@ -21,6 +21,7 @@
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/io.h>
+#include <linux/of.h>
 
 #include <asm/hardware/gic.h>
 
@@ -129,6 +130,11 @@ void __init tegra_init_irq(void)
         gic_arch_extn.irq_unmask = tegra_unmask;
         gic_arch_extn.irq_retrigger = tegra_retrigger;
 
-        gic_init(0, 29, IO_ADDRESS(TEGRA_ARM_INT_DIST_BASE),
-                 IO_ADDRESS(TEGRA_ARM_PERIF_BASE + 0x100));
+        /*
+         * Check if there is a devicetree present, since the GIC will be
+         * initialized elsewhere under DT.
+         */
+        if (!of_have_populated_dt())
+                gic_init(0, 29, IO_ADDRESS(TEGRA_ARM_INT_DIST_BASE),
+                        IO_ADDRESS(TEGRA_ARM_PERIF_BASE + 0x100));
 }