ARM: OMAP: split OMAP1, OMAP2+ RNG device registration

Move the OMAP1-specific RNG device creation off to mach-omap1/devices.c,
and create a omap_device-backed registration function for OMAP2+ devices
in mach-omap2/devices.c.

As a nice side-benefit, we can also get rid of
arch/arm/plat-omap/devices.c, thanks to some recent changes from Tony.

One change from the previous behavior is that the RNG devices are now
registered unconditionally.  This should allow the RNG drivers to be
loaded as modules, even if the original kernel was not built that way.

Signed-off-by: Paul Walmsley <paul@pwsan.com>

arch/arm/mach-omap1/devices.c

@@ -357,6 +357,30 @@ static inline void omap_init_uwire(void) {}
 #endif
 
 
+#define OMAP1_RNG_BASE		0xfffe5000
+
+static struct resource omap1_rng_resources[] = {
+	{
+		.start		= OMAP1_RNG_BASE,
+		.end		= OMAP1_RNG_BASE + 0x4f,
+		.flags		= IORESOURCE_MEM,
+	},
+};
+
+static struct platform_device omap1_rng_device = {
+	.name		= "omap_rng",
+	.id		= -1,
+	.num_resources	= ARRAY_SIZE(omap1_rng_resources),
+	.resource	= omap1_rng_resources,
+};
+
+static void omap1_init_rng(void)
+{
+	(void) platform_device_register(&omap1_rng_device);
+}
+
+/*-------------------------------------------------------------------------*/
+
 /*
  * This gets called after board-specific INIT_MACHINE, and initializes most
  * on-chip peripherals accessible on this board (except for few like USB):
@@ -395,6 +419,7 @@ static int __init omap1_init_devices(void)
 	omap_init_spi100k();
 	omap_init_sti();
 	omap_init_uwire();
+	omap1_init_rng();
 
 	return 0;
 }

arch/arm/mach-omap2/devices.c

@@ -462,6 +462,23 @@ static void omap_init_pmu(void)
 	platform_device_register(&omap_pmu_device);
 }
 
+/**
+ * omap_init_rng - bind the RNG hwmod to the RNG omap_device
+ *
+ * Bind the RNG hwmod to the RNG omap_device.  No return value.
+ */
+static void omap_init_rng(void)
+{
+	struct omap_hwmod *oh;
+	struct platform_device *pdev;
+
+	oh = omap_hwmod_lookup("rng");
+	if (!oh)
+		return;
+
+	pdev = omap_device_build("omap_rng", -1, oh, NULL, 0, NULL, 0, 0);
+	WARN(IS_ERR(pdev), "Can't build omap_device for omap_rng\n");
+}
 
 #if defined(CONFIG_CRYPTO_DEV_OMAP_SHAM) || defined(CONFIG_CRYPTO_DEV_OMAP_SHAM_MODULE)
 
@@ -649,6 +666,7 @@ static int __init omap2_init_devices(void)
 	}
 	omap_init_pmu();
 	omap_init_sti();
+	omap_init_rng();
 	omap_init_sham();
 	omap_init_aes();
 	omap_init_vout();