ARM: OMAP4430: PMU: prepare to create PMU device via HWMOD

For OMAP4430 PMU events are routed to the CPU via the cross trigger interface
(CTI) because there are no dedicated interrupts. In order to route the PMU
events via the CTI IRQs, the following modules must be enabled:

        l3_instr, l3_main_3, debugss

Therefore, build the arm-pmu device via these three HWMODs.

However, the CTI support for this platform still needs some work.  Until
that's finished, temporarily disable the PMU on OMAP4430.

Cc: Ming Lei <ming.lei@canonical.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Benoit Cousson <b-cousson@ti.com>
Cc: Paul Walmsley <paul@pwsan.com>
Cc: Kevin Hilman <khilman@ti.com>
Signed-off-by: NMing Lei <ming.lei@canonical.com>
Signed-off-by: NWill Deacon <will.deacon@arm.com>
Signed-off-by: NJon Hunter <jon-hunter@ti.com>
[paul@pwsan.com: temporarily disabled OMAP4430 PMU support until a
 better CTI interface can be implemented; added patch description note]
Signed-off-by: NPaul Walmsley <paul@pwsan.com>

arch/arm/mach-omap2/pmu.c

@@ -19,6 +19,7 @@
 
 static char *omap2_pmu_oh_names[] = {"mpu"};
 static char *omap3_pmu_oh_names[] = {"mpu", "debugss"};
+static char *omap4430_pmu_oh_names[] = {"l3_main_3", "l3_instr", "debugss"};
 static struct platform_device *omap_pmu_dev;
 
 /**
@@ -27,16 +28,16 @@ static struct platform_device *omap_pmu_dev;
  * @oh_names:	Array of OMAP HWMODS names required to create PMU device
  *
  * Uses OMAP HWMOD framework to create and register an ARM PMU device
- * from a list of HWMOD names passed. Currently supports OMAP2 and
- * OMAP3 devices.
+ * from a list of HWMOD names passed. Currently supports OMAP2, OMAP3
+ * and OMAP4430 devices.
  */
 static int __init omap2_init_pmu(unsigned oh_num, char *oh_names[])
 {
 	int i;
-	struct omap_hwmod *oh[2];
+	struct omap_hwmod *oh[3];
 	char *dev_name = "arm-pmu";
 
-	if ((!oh_num) || (oh_num > 2))
+	if ((!oh_num) || (oh_num > 3))
 		return -EINVAL;
 
 	for (i = 0; i < oh_num; i++) {
@@ -66,6 +67,7 @@ static int __init omap_init_pmu(void)
 	 *
 	 * OMAP24xx:	mpu
 	 * OMAP3xxx:	mpu, debugss
+	 * OMAP4430:	l3_main_3, l3_instr, debugss
 	 */
 	if (cpu_is_omap24xx()) {
 		oh_num = ARRAY_SIZE(omap2_pmu_oh_names);
@@ -73,6 +75,12 @@ static int __init omap_init_pmu(void)
 	} else if (cpu_is_omap34xx()) {
 		oh_num = ARRAY_SIZE(omap3_pmu_oh_names);
 		oh_names = omap3_pmu_oh_names;
+	} else if (cpu_is_omap443x()) {
+		oh_num = ARRAY_SIZE(omap4430_pmu_oh_names);
+		oh_names = omap4430_pmu_oh_names;
+		/* XXX Remove the next two lines when CTI driver available */
+		pr_info("ARM PMU: not yet supported on OMAP4430 due to missing CTI driver\n");
+		return 0;
 	} else {
 		return 0;
 	}