OMAP: hwmod/device: add omap_{device,hwmod}_get_mpu_rt_va

Add omap_device_get_mpu_rt_va().  This is intended to be used by
device drivers (currently, via a struct platform_data function
pointer) to retrieve their corresponding device's virtual base address
that the MPU should use to access the device.  This is needed because
the omap_hwmod code does its own ioremap(), in order to gain access to
the module's OCP_SYSCONFIG register.

Add omap_hwmod_get_mpu_rt_va().  omap_device_get_mpu_rt_va() calls this
function to do the real work.

While here, rename struct omap_hwmod._rt_va to struct
omap_hwmod._mpu_rt_va, to reinforce that it refers to the MPU's
register target virtual address base (as opposed to, for example, the
L3's).

In the future, this belongs as a function in an omap_bus, so it is not
necessary to call this through a platform_data function pointer.

The use-case for this function was originally presented by Santosh
Shilimkar <santosh.shilimkar@ti.com>.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: Santosh Shilimkar <santosh.shilimkar@ti.com>

3 files changed, 25 insertions, 3 deletions

diff --git a/arch/arm/plat-omap/include/plat/omap_device.h b/arch/arm/plat-omap/include/plat/omap_device.h
index 3694b622c4ac..25cd9ac3b095 100644
--- a/arch/arm/plat-omap/include/plat/omap_device.h
+++ b/arch/arm/plat-omap/include/plat/omap_device.h
@@ -101,6 +101,8 @@ struct omap_device *omap_device_build_ss(const char *pdev_name, int pdev_id,
 int omap_device_register(struct omap_device *od);
 int omap_early_device_register(struct omap_device *od);
 
+void __iomem *omap_device_get_rt_va(struct omap_device *od);
+
 /* OMAP PM interface */
 int omap_device_align_pm_lat(struct platform_device *pdev,
                              u32 new_wakeup_lat_limit);
diff --git a/arch/arm/plat-omap/include/plat/omap_hwmod.h b/arch/arm/plat-omap/include/plat/omap_hwmod.h
index aebfacb3106e..a4e508dfaba2 100644
--- a/arch/arm/plat-omap/include/plat/omap_hwmod.h
+++ b/arch/arm/plat-omap/include/plat/omap_hwmod.h
@@ -1,7 +1,7 @@
 /*
  * omap_hwmod macros, structures
  *
- * Copyright (C) 2009 Nokia Corporation
+ * Copyright (C) 2009-2010 Nokia Corporation
  * Paul Walmsley
  *
  * Created in collaboration with (alphabetical order): Benoît Cousson,
@@ -419,7 +419,7 @@ struct omap_hwmod_class {
  * @slaves: ptr to array of OCP ifs that this hwmod can respond on
  * @dev_attr: arbitrary device attributes that can be passed to the driver
  * @_sysc_cache: internal-use hwmod flags
- * @_rt_va: cached register target start address (internal use)
+ * @_mpu_rt_va: cached register target start address (internal use)
  * @_mpu_port_index: cached MPU register target slave ID (internal use)
  * @msuspendmux_reg_id: CONTROL_MSUSPENDMUX register ID (1-6)
  * @msuspendmux_shift: CONTROL_MSUSPENDMUX register bit shift
@@ -460,7 +460,7 @@ struct omap_hwmod {
         struct omap_hwmod_ocp_if        **slaves;  /* connect to *_TA */
         void                            *dev_attr;
         u32                             _sysc_cache;
-        void __iomem                    *_rt_va;
+        void __iomem                    *_mpu_rt_va;
         struct list_head                node;
         u16                             flags;
         u8                              _mpu_port_index;
@@ -507,6 +507,7 @@ int omap_hwmod_count_resources(struct omap_hwmod *oh);
 int omap_hwmod_fill_resources(struct omap_hwmod *oh, struct resource *res);
 
 struct powerdomain *omap_hwmod_get_pwrdm(struct omap_hwmod *oh);
+void __iomem *omap_hwmod_get_mpu_rt_va(struct omap_hwmod *oh);
 
 int omap_hwmod_add_initiator_dep(struct omap_hwmod *oh,
                                  struct omap_hwmod *init_oh);
diff --git a/arch/arm/plat-omap/omap_device.c b/arch/arm/plat-omap/omap_device.c
index f9dec0d32fa4..dee4629b7b47 100644
--- a/arch/arm/plat-omap/omap_device.c
+++ b/arch/arm/plat-omap/omap_device.c
@@ -655,6 +655,25 @@ struct powerdomain *omap_device_get_pwrdm(struct omap_device *od)
         return omap_hwmod_get_pwrdm(od->hwmods[0]);
 }
 
+/**
+ * omap_device_get_mpu_rt_va - return the MPU's virtual addr for the hwmod base
+ * @od: struct omap_device *
+ *
+ * Return the MPU's virtual address for the base of the hwmod, from
+ * the ioremap() that the hwmod code does.  Only valid if there is one
+ * hwmod associated with this device.  Returns NULL if there are zero
+ * or more than one hwmods associated with this omap_device;
+ * otherwise, passes along the return value from
+ * omap_hwmod_get_mpu_rt_va().
+ */
+void __iomem *omap_device_get_rt_va(struct omap_device *od)
+{
+        if (od->hwmods_cnt != 1)
+                return NULL;
+
+        return omap_hwmod_get_mpu_rt_va(od->hwmods[0]);
+}
+
 /*
  * Public functions intended for use in omap_device_pm_latency
  * .activate_func and .deactivate_func function pointers