* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
- * This code manages "OMAP modules" (on-chip devices) and their
- * integration with Linux device driver and bus code.
- *
- * References:
+ * Introduction
+ * ------------
+ * One way to view an OMAP SoC is as a collection of largely unrelated
+ * IP blocks connected by interconnects. The IP blocks include
+ * devices such as ARM processors, audio serial interfaces, UARTs,
+ * etc. Some of these devices, like the DSP, are created by TI;
+ * others, like the SGX, largely originate from external vendors. In
+ * TI's documentation, on-chip devices are referred to as "OMAP
+ * modules." Some of these IP blocks are identical across several
+ * OMAP versions. Others are revised frequently.
+ *
+ * These OMAP modules are tied together by various interconnects.
+ * Most of the address and data flow between modules is via OCP-based
+ * interconnects such as the L3 and L4 buses; but there are other
+ * interconnects that distribute the hardware clock tree, handle idle
+ * and reset signaling, supply power, and connect the modules to
+ * various pads or balls on the OMAP package.
+ *
+ * OMAP hwmod provides a consistent way to describe the on-chip
+ * hardware blocks and their integration into the rest of the chip.
+ * This description can be automatically generated from the TI
+ * hardware database. OMAP hwmod provides a standard, consistent API
+ * to reset, enable, idle, and disable these hardware blocks. And
+ * hwmod provides a way for other core code, such as the Linux device
+ * code or the OMAP power management and address space mapping code,
+ * to query the hardware database.
+ *
+ * Using hwmod
+ * -----------
+ * Drivers won't call hwmod functions directly. That is done by the
+ * omap_device code, and in rare occasions, by custom integration code
+ * in arch/arm/ *omap*. The omap_device code includes functions to
+ * build a struct platform_device using omap_hwmod data, and that is
+ * currently how hwmod data is communicated to drivers and to the
+ * Linux driver model. Most drivers will call omap_hwmod functions only
+ * indirectly, via pm_runtime*() functions.
+ *
+ * From a layering perspective, here is where the OMAP hwmod code
+ * fits into the kernel software stack:
+ *
+ * +-------------------------------+
+ * | Device driver code |
+ * | (e.g., drivers/) |
+ * +-------------------------------+
+ * | Linux driver model |
+ * | (platform_device / |
+ * | platform_driver data/code) |
+ * +-------------------------------+
+ * | OMAP core-driver integration |
+ * |(arch/arm/mach-omap2/devices.c)|
+ * +-------------------------------+
+ * | omap_device code |
+ * | (../plat-omap/omap_device.c) |
+ * +-------------------------------+
+ * ----> | omap_hwmod code/data | <-----
+ * | (../mach-omap2/omap_hwmod*) |
+ * +-------------------------------+
+ * | OMAP clock/PRCM/register fns |
+ * | (__raw_{read,write}l, clk*) |
+ * +-------------------------------+
+ *
+ * Device drivers should not contain any OMAP-specific code or data in
+ * them. They should only contain code to operate the IP block that
+ * the driver is responsible for. This is because these IP blocks can
+ * also appear in other SoCs, either from TI (such as DaVinci) or from
+ * other manufacturers; and drivers should be reusable across other
+ * platforms.
+ *
+ * The OMAP hwmod code also will attempt to reset and idle all on-chip
+ * devices upon boot. The goal here is for the kernel to be
+ * completely self-reliant and independent from bootloaders. This is
+ * to ensure a repeatable configuration, both to ensure consistent
+ * runtime behavior, and to make it easier for others to reproduce
+ * bugs.
+ *
+ * OMAP module activity states
+ * ---------------------------
+ * The hwmod code considers modules to be in one of several activity
+ * states. IP blocks start out in an UNKNOWN state, then once they
+ * are registered via the hwmod code, proceed to the REGISTERED state.
+ * Once their clock names are resolved to clock pointers, the module
+ * enters the CLKS_INITED state; and finally, once the module has been
+ * reset and the integration registers programmed, the INITIALIZED state
+ * is entered. The hwmod code will then place the module into either
+ * the IDLE state to save power, or in the case of a critical system
+ * module, the ENABLED state.
+ *
+ * OMAP core integration code can then call omap_hwmod*() functions
+ * directly to move the module between the IDLE, ENABLED, and DISABLED
+ * states, as needed. This is done during both the PM idle loop, and
+ * in the OMAP core integration code's implementation of the PM runtime
+ * functions.
+ *
+ * References
+ * ----------
+ * This is a partial list.
* - OMAP2420 Multimedia Processor Silicon Revision 2.1.1, 2.2 (SWPU064)
* - OMAP2430 Multimedia Device POP Silicon Revision 2.1 (SWPU090)
* - OMAP34xx Multimedia Device Silicon Revision 3.1 (SWPU108)
}
/**
- * _sysc_enable - try to bring a module out of idle via OCP_SYSCONFIG
+ * _enable_sysc - try to bring a module out of idle via OCP_SYSCONFIG
* @oh: struct omap_hwmod *
*
* If module is marked as SWSUP_SIDLE, force the module out of slave
* as SWSUP_MSUSPEND, force the module out of master standby;
* otherwise, configure it for smart-standby. No return value.
*/
-static void _sysc_enable(struct omap_hwmod *oh)
+static void _enable_sysc(struct omap_hwmod *oh)
{
u8 idlemode, sf;
u32 v;
}
/**
- * _sysc_idle - try to put a module into idle via OCP_SYSCONFIG
+ * _idle_sysc - try to put a module into idle via OCP_SYSCONFIG
* @oh: struct omap_hwmod *
*
* If module is marked as SWSUP_SIDLE, force the module into slave
* as SWSUP_MSUSPEND, force the module into master standby; otherwise,
* configure it for smart-standby. No return value.
*/
-static void _sysc_idle(struct omap_hwmod *oh)
+static void _idle_sysc(struct omap_hwmod *oh)
{
u8 idlemode, sf;
u32 v;
}
/**
- * _sysc_shutdown - force a module into idle via OCP_SYSCONFIG
+ * _shutdown_sysc - force a module into idle via OCP_SYSCONFIG
* @oh: struct omap_hwmod *
*
* Force the module into slave idle and master suspend. No return
* value.
*/
-static void _sysc_shutdown(struct omap_hwmod *oh)
+static void _shutdown_sysc(struct omap_hwmod *oh)
{
u32 v;
u8 sf;
* @oh: struct omap_hwmod *
*
* Enables an omap_hwmod @oh such that the MPU can access the hwmod's
- * register target. Returns -EINVAL if the hwmod is in the wrong
- * state or passes along the return value of _wait_target_ready().
+ * register target. (This function has a full name --
+ * _omap_hwmod_enable() rather than simply _enable() -- because it is
+ * currently required by the pm34xx.c idle loop.) Returns -EINVAL if
+ * the hwmod is in the wrong state or passes along the return value of
+ * _wait_target_ready().
*/
int _omap_hwmod_enable(struct omap_hwmod *oh)
{
if (oh->class->sysc) {
if (!(oh->_int_flags & _HWMOD_SYSCONFIG_LOADED))
_update_sysc_cache(oh);
- _sysc_enable(oh);
+ _enable_sysc(oh);
}
} else {
pr_debug("omap_hwmod: %s: _wait_target_ready: %d\n",
}
/**
- * _idle - idle an omap_hwmod
+ * _omap_hwmod_idle - idle an omap_hwmod
* @oh: struct omap_hwmod *
*
* Idles an omap_hwmod @oh. This should be called once the hwmod has
- * no further work. Returns -EINVAL if the hwmod is in the wrong
- * state or returns 0.
+ * no further work. (This function has a full name --
+ * _omap_hwmod_idle() rather than simply _idle() -- because it is
+ * currently required by the pm34xx.c idle loop.) Returns -EINVAL if
+ * the hwmod is in the wrong state or returns 0.
*/
int _omap_hwmod_idle(struct omap_hwmod *oh)
{
pr_debug("omap_hwmod: %s: idling\n", oh->name);
if (oh->class->sysc)
- _sysc_idle(oh);
+ _idle_sysc(oh);
_del_initiator_dep(oh, mpu_oh);
_disable_clocks(oh);
pr_debug("omap_hwmod: %s: disabling\n", oh->name);
if (oh->class->sysc)
- _sysc_shutdown(oh);
+ _shutdown_sysc(oh);
/*
* If an IP contains only one HW reset line, then assert it
*/
if (oh->class->sysc) {
_update_sysc_cache(oh);
- _sysc_enable(oh);
+ _enable_sysc(oh);
}
}
* omap_hwmod_enable - enable an omap_hwmod
* @oh: struct omap_hwmod *
*
- * Enable an omap_hwomd @oh. Intended to be called by omap_device_enable().
+ * Enable an omap_hwmod @oh. Intended to be called by omap_device_enable().
* Returns -EINVAL on error or passes along the return value from _enable().
*/
int omap_hwmod_enable(struct omap_hwmod *oh)
* omap_hwmod_idle - idle an omap_hwmod
* @oh: struct omap_hwmod *
*
- * Idle an omap_hwomd @oh. Intended to be called by omap_device_idle().
+ * Idle an omap_hwmod @oh. Intended to be called by omap_device_idle().
* Returns -EINVAL on error or passes along the return value from _idle().
*/
int omap_hwmod_idle(struct omap_hwmod *oh)
* omap_hwmod_shutdown - shutdown an omap_hwmod
* @oh: struct omap_hwmod *
*
- * Shutdown an omap_hwomd @oh. Intended to be called by
+ * Shutdown an omap_hwmod @oh. Intended to be called by
* omap_device_shutdown(). Returns -EINVAL on error or passes along
* the return value from _shutdown().
*/
projects / users / jedix / linux-maple.git / commitdiff