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>

diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c
index b2c8e87..ec0be6d 100644 (file)
--- a/arch/arm/mach-omap2/omap_hwmod.c
+++ b/arch/arm/mach-omap2/omap_hwmod.c
@@ -1,7 +1,7 @@
 /*
  * omap_hwmod implementation for OMAP2/3/4
  *
- * Copyright (C) 2009 Nokia Corporation
+ * Copyright (C) 2009-2010 Nokia Corporation
  *
  * Paul Walmsley, Benoît Cousson, Kevin Hilman
  *
@@ -1069,12 +1069,12 @@ static int _setup(struct omap_hwmod *oh, void *data)
 
 u32 omap_hwmod_readl(struct omap_hwmod *oh, u16 reg_offs)
 {
-       return __raw_readl(oh->_rt_va + reg_offs);
+       return __raw_readl(oh->_mpu_rt_va + reg_offs);
 }
 
 void omap_hwmod_writel(u32 v, struct omap_hwmod *oh, u16 reg_offs)
 {
-       __raw_writel(v, oh->_rt_va + reg_offs);
+       __raw_writel(v, oh->_mpu_rt_va + reg_offs);
 }
 
 int omap_hwmod_set_slave_idlemode(struct omap_hwmod *oh, u8 idlemode)
@@ -1131,7 +1131,7 @@ int omap_hwmod_register(struct omap_hwmod *oh)
        ms_id = _find_mpu_port_index(oh);
        if (!IS_ERR_VALUE(ms_id)) {
                oh->_mpu_port_index = ms_id;
-               oh->_rt_va = _find_mpu_rt_base(oh, oh->_mpu_port_index);
+               oh->_mpu_rt_va = _find_mpu_rt_base(oh, oh->_mpu_port_index);
        } else {
                oh->_int_flags |= _HWMOD_NO_MPU_PORT;
        }
@@ -1283,7 +1283,7 @@ int omap_hwmod_unregister(struct omap_hwmod *oh)
        pr_debug("omap_hwmod: %s: unregistering\n", oh->name);
 
        mutex_lock(&omap_hwmod_mutex);
-       iounmap(oh->_rt_va);
+       iounmap(oh->_mpu_rt_va);
        list_del(&oh->node);
        mutex_unlock(&omap_hwmod_mutex);
 
@@ -1544,6 +1544,29 @@ struct powerdomain *omap_hwmod_get_pwrdm(struct omap_hwmod *oh)
 }
 
 /**
+ * omap_hwmod_get_mpu_rt_va - return the module's base address (for the MPU)
+ * @oh: struct omap_hwmod *
+ *
+ * Returns the virtual address corresponding to the beginning of the
+ * module's register target, in the address range that is intended to
+ * be used by the MPU.  Returns the virtual address upon success or NULL
+ * upon error.
+ */
+void __iomem *omap_hwmod_get_mpu_rt_va(struct omap_hwmod *oh)
+{
+       if (!oh)
+               return NULL;
+
+       if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
+               return NULL;
+
+       if (oh->_state == _HWMOD_STATE_UNKNOWN)
+               return NULL;
+
+       return oh->_mpu_rt_va;
+}
+
+/**
  * omap_hwmod_add_initiator_dep - add sleepdep from @init_oh to @oh
  * @oh: struct omap_hwmod *
  * @init_oh: struct omap_hwmod * (initiator)

diff --git a/arch/arm/plat-omap/include/plat/omap_device.h b/arch/arm/plat-omap/include/plat/omap_device.h
index 3694b62..25cd9ac 100644 (file)
--- 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 aebfacb..a4e508d 100644 (file)
--- 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 f9dec0d..dee4629 100644 (file)
--- 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