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* omap_hwmod implementation for OMAP2/3/4
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* Copyright (C) 2009-2011 Nokia Corporation
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* Copyright (C) 2011 Texas Instruments, Inc.
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* Paul Walmsley, BenoƮt Cousson, Kevin Hilman
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* Created in collaboration with (alphabetical order): Thara Gopinath,
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* Tony Lindgren, Rajendra Nayak, Vikram Pandita, Sakari Poussa, Anand
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* Sawant, Santosh Shilimkar, Richard Woodruff
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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* One way to view an OMAP SoC is as a collection of largely unrelated
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* IP blocks connected by interconnects. The IP blocks include
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* devices such as ARM processors, audio serial interfaces, UARTs,
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* etc. Some of these devices, like the DSP, are created by TI;
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* others, like the SGX, largely originate from external vendors. In
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* TI's documentation, on-chip devices are referred to as "OMAP
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* modules." Some of these IP blocks are identical across several
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* OMAP versions. Others are revised frequently.
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* These OMAP modules are tied together by various interconnects.
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* Most of the address and data flow between modules is via OCP-based
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* interconnects such as the L3 and L4 buses; but there are other
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* interconnects that distribute the hardware clock tree, handle idle
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* and reset signaling, supply power, and connect the modules to
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* various pads or balls on the OMAP package.
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* OMAP hwmod provides a consistent way to describe the on-chip
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* hardware blocks and their integration into the rest of the chip.
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* This description can be automatically generated from the TI
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* hardware database. OMAP hwmod provides a standard, consistent API
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* to reset, enable, idle, and disable these hardware blocks. And
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* hwmod provides a way for other core code, such as the Linux device
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* code or the OMAP power management and address space mapping code,
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* to query the hardware database.
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* Drivers won't call hwmod functions directly. That is done by the
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* omap_device code, and in rare occasions, by custom integration code
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* in arch/arm/ *omap*. The omap_device code includes functions to
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* build a struct platform_device using omap_hwmod data, and that is
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* currently how hwmod data is communicated to drivers and to the
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* Linux driver model. Most drivers will call omap_hwmod functions only
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* indirectly, via pm_runtime*() functions.
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* From a layering perspective, here is where the OMAP hwmod code
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* fits into the kernel software stack:
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* +-------------------------------+
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* | Device driver code |
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* | (e.g., drivers/) |
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* +-------------------------------+
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* | Linux driver model |
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* | (platform_device / |
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* | platform_driver data/code) |
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* +-------------------------------+
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* | OMAP core-driver integration |
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* |(arch/arm/mach-omap2/devices.c)|
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* +-------------------------------+
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* | omap_device code |
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* | (../plat-omap/omap_device.c) |
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* +-------------------------------+
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* ----> | omap_hwmod code/data | <-----
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* | (../mach-omap2/omap_hwmod*) |
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* +-------------------------------+
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* | OMAP clock/PRCM/register fns |
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* | (__raw_{read,write}l, clk*) |
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* +-------------------------------+
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* Device drivers should not contain any OMAP-specific code or data in
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* them. They should only contain code to operate the IP block that
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* the driver is responsible for. This is because these IP blocks can
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* also appear in other SoCs, either from TI (such as DaVinci) or from
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* other manufacturers; and drivers should be reusable across other
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* The OMAP hwmod code also will attempt to reset and idle all on-chip
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* devices upon boot. The goal here is for the kernel to be
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* completely self-reliant and independent from bootloaders. This is
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* to ensure a repeatable configuration, both to ensure consistent
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* runtime behavior, and to make it easier for others to reproduce
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* OMAP module activity states
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* ---------------------------
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* The hwmod code considers modules to be in one of several activity
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* states. IP blocks start out in an UNKNOWN state, then once they
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* are registered via the hwmod code, proceed to the REGISTERED state.
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* Once their clock names are resolved to clock pointers, the module
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* enters the CLKS_INITED state; and finally, once the module has been
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* reset and the integration registers programmed, the INITIALIZED state
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* is entered. The hwmod code will then place the module into either
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* the IDLE state to save power, or in the case of a critical system
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* module, the ENABLED state.
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* OMAP core integration code can then call omap_hwmod*() functions
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* directly to move the module between the IDLE, ENABLED, and DISABLED
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* states, as needed. This is done during both the PM idle loop, and
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* in the OMAP core integration code's implementation of the PM runtime
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* This is a partial list.
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* - OMAP2420 Multimedia Processor Silicon Revision 2.1.1, 2.2 (SWPU064)
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* - OMAP2430 Multimedia Device POP Silicon Revision 2.1 (SWPU090)
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* - OMAP34xx Multimedia Device Silicon Revision 3.1 (SWPU108)
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* - OMAP4430 Multimedia Device Silicon Revision 1.0 (SWPU140)
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* - Open Core Protocol Specification 2.2
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* - handle IO mapping
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* - bus throughput & module latency measurement code
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* XXX add tests at the beginning of each function to ensure the hwmod is
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* in the appropriate state
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* XXX error return values should be checked to ensure that they are
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/io.h>
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/list.h>
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#include <linux/mutex.h>
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#include <linux/spinlock.h>
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#include <plat/common.h>
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#include <plat/cpu.h>
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#include "clockdomain.h"
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#include "powerdomain.h"
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#include <plat/clock.h>
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#include <plat/omap_hwmod.h>
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#include <plat/prcm.h>
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#include "cm2xxx_3xxx.h"
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#include "cminst44xx.h"
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#include "prm2xxx_3xxx.h"
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#include "prminst44xx.h"
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/* Maximum microseconds to wait for OMAP module to softreset */
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#define MAX_MODULE_SOFTRESET_WAIT 10000
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/* Name of the OMAP hwmod for the MPU */
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#define MPU_INITIATOR_NAME "mpu"
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/* omap_hwmod_list contains all registered struct omap_hwmods */
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static LIST_HEAD(omap_hwmod_list);
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/* mpu_oh: used to add/remove MPU initiator from sleepdep list */
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static struct omap_hwmod *mpu_oh;
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/* Private functions */
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* _update_sysc_cache - return the module OCP_SYSCONFIG register, keep copy
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* @oh: struct omap_hwmod *
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* Load the current value of the hwmod OCP_SYSCONFIG register into the
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* struct omap_hwmod for later use. Returns -EINVAL if the hwmod has no
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* OCP_SYSCONFIG register or 0 upon success.
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static int _update_sysc_cache(struct omap_hwmod *oh)
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if (!oh->class->sysc) {
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WARN(1, "omap_hwmod: %s: cannot read OCP_SYSCONFIG: not defined on hwmod's class\n", oh->name);
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/* XXX ensure module interface clock is up */
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oh->_sysc_cache = omap_hwmod_read(oh, oh->class->sysc->sysc_offs);
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if (!(oh->class->sysc->sysc_flags & SYSC_NO_CACHE))
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oh->_int_flags |= _HWMOD_SYSCONFIG_LOADED;
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* _write_sysconfig - write a value to the module's OCP_SYSCONFIG register
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* @v: OCP_SYSCONFIG value to write
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* @oh: struct omap_hwmod *
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* Write @v into the module class' OCP_SYSCONFIG register, if it has
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* one. No return value.
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static void _write_sysconfig(u32 v, struct omap_hwmod *oh)
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if (!oh->class->sysc) {
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WARN(1, "omap_hwmod: %s: cannot write OCP_SYSCONFIG: not defined on hwmod's class\n", oh->name);
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/* XXX ensure module interface clock is up */
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/* Module might have lost context, always update cache and register */
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omap_hwmod_write(v, oh, oh->class->sysc->sysc_offs);
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* _set_master_standbymode: set the OCP_SYSCONFIG MIDLEMODE field in @v
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* @oh: struct omap_hwmod *
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* @standbymode: MIDLEMODE field bits
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* @v: pointer to register contents to modify
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* Update the master standby mode bits in @v to be @standbymode for
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* the @oh hwmod. Does not write to the hardware. Returns -EINVAL
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* upon error or 0 upon success.
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static int _set_master_standbymode(struct omap_hwmod *oh, u8 standbymode,
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if (!oh->class->sysc ||
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!(oh->class->sysc->sysc_flags & SYSC_HAS_MIDLEMODE))
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if (!oh->class->sysc->sysc_fields) {
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WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
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mstandby_shift = oh->class->sysc->sysc_fields->midle_shift;
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mstandby_mask = (0x3 << mstandby_shift);
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*v &= ~mstandby_mask;
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*v |= __ffs(standbymode) << mstandby_shift;
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* _set_slave_idlemode: set the OCP_SYSCONFIG SIDLEMODE field in @v
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* @oh: struct omap_hwmod *
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* @idlemode: SIDLEMODE field bits
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* @v: pointer to register contents to modify
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* Update the slave idle mode bits in @v to be @idlemode for the @oh
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* hwmod. Does not write to the hardware. Returns -EINVAL upon error
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static int _set_slave_idlemode(struct omap_hwmod *oh, u8 idlemode, u32 *v)
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if (!oh->class->sysc ||
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!(oh->class->sysc->sysc_flags & SYSC_HAS_SIDLEMODE))
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if (!oh->class->sysc->sysc_fields) {
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WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
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sidle_shift = oh->class->sysc->sysc_fields->sidle_shift;
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sidle_mask = (0x3 << sidle_shift);
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*v |= __ffs(idlemode) << sidle_shift;
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* _set_clockactivity: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v
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* @oh: struct omap_hwmod *
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* @clockact: CLOCKACTIVITY field bits
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* @v: pointer to register contents to modify
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* Update the clockactivity mode bits in @v to be @clockact for the
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* @oh hwmod. Used for additional powersaving on some modules. Does
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* not write to the hardware. Returns -EINVAL upon error or 0 upon
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static int _set_clockactivity(struct omap_hwmod *oh, u8 clockact, u32 *v)
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if (!oh->class->sysc ||
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!(oh->class->sysc->sysc_flags & SYSC_HAS_CLOCKACTIVITY))
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if (!oh->class->sysc->sysc_fields) {
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WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
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clkact_shift = oh->class->sysc->sysc_fields->clkact_shift;
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clkact_mask = (0x3 << clkact_shift);
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*v |= clockact << clkact_shift;
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* _set_softreset: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v
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* @oh: struct omap_hwmod *
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* @v: pointer to register contents to modify
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* Set the SOFTRESET bit in @v for hwmod @oh. Returns -EINVAL upon
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* error or 0 upon success.
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static int _set_softreset(struct omap_hwmod *oh, u32 *v)
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if (!oh->class->sysc ||
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!(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET))
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if (!oh->class->sysc->sysc_fields) {
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WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
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softrst_mask = (0x1 << oh->class->sysc->sysc_fields->srst_shift);
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* _set_module_autoidle: set the OCP_SYSCONFIG AUTOIDLE field in @v
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* @oh: struct omap_hwmod *
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* @autoidle: desired AUTOIDLE bitfield value (0 or 1)
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* @v: pointer to register contents to modify
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* Update the module autoidle bit in @v to be @autoidle for the @oh
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* hwmod. The autoidle bit controls whether the module can gate
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* internal clocks automatically when it isn't doing anything; the
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* exact function of this bit varies on a per-module basis. This
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* function does not write to the hardware. Returns -EINVAL upon
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* error or 0 upon success.
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static int _set_module_autoidle(struct omap_hwmod *oh, u8 autoidle,
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if (!oh->class->sysc ||
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!(oh->class->sysc->sysc_flags & SYSC_HAS_AUTOIDLE))
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if (!oh->class->sysc->sysc_fields) {
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WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
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autoidle_shift = oh->class->sysc->sysc_fields->autoidle_shift;
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autoidle_mask = (0x1 << autoidle_shift);
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*v &= ~autoidle_mask;
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*v |= autoidle << autoidle_shift;
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* _enable_wakeup: set OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
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* @oh: struct omap_hwmod *
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* Allow the hardware module @oh to send wakeups. Returns -EINVAL
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* upon error or 0 upon success.
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static int _enable_wakeup(struct omap_hwmod *oh, u32 *v)
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if (!oh->class->sysc ||
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!((oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP) ||
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(oh->class->sysc->idlemodes & SIDLE_SMART_WKUP) ||
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(oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)))
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if (!oh->class->sysc->sysc_fields) {
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WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
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if (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)
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*v |= 0x1 << oh->class->sysc->sysc_fields->enwkup_shift;
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if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP)
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_set_slave_idlemode(oh, HWMOD_IDLEMODE_SMART_WKUP, v);
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if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
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_set_master_standbymode(oh, HWMOD_IDLEMODE_SMART_WKUP, v);
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/* XXX test pwrdm_get_wken for this hwmod's subsystem */
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oh->_int_flags |= _HWMOD_WAKEUP_ENABLED;
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* _disable_wakeup: clear OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
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* @oh: struct omap_hwmod *
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* Prevent the hardware module @oh to send wakeups. Returns -EINVAL
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* upon error or 0 upon success.
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static int _disable_wakeup(struct omap_hwmod *oh, u32 *v)
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if (!oh->class->sysc ||
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!((oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP) ||
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(oh->class->sysc->idlemodes & SIDLE_SMART_WKUP) ||
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(oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)))
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if (!oh->class->sysc->sysc_fields) {
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WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
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if (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)
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*v &= ~(0x1 << oh->class->sysc->sysc_fields->enwkup_shift);
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if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP)
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_set_slave_idlemode(oh, HWMOD_IDLEMODE_SMART, v);
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if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
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_set_master_standbymode(oh, HWMOD_IDLEMODE_SMART_WKUP, v);
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/* XXX test pwrdm_get_wken for this hwmod's subsystem */
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oh->_int_flags &= ~_HWMOD_WAKEUP_ENABLED;
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* _add_initiator_dep: prevent @oh from smart-idling while @init_oh is active
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* @oh: struct omap_hwmod *
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* Prevent the hardware module @oh from entering idle while the
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* hardare module initiator @init_oh is active. Useful when a module
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* will be accessed by a particular initiator (e.g., if a module will
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* be accessed by the IVA, there should be a sleepdep between the IVA
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* initiator and the module). Only applies to modules in smart-idle
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* mode. If the clockdomain is marked as not needing autodeps, return
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* 0 without doing anything. Otherwise, returns -EINVAL upon error or
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* passes along clkdm_add_sleepdep() value upon success.
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static int _add_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh)
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if (oh->_clk->clkdm && oh->_clk->clkdm->flags & CLKDM_NO_AUTODEPS)
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return clkdm_add_sleepdep(oh->_clk->clkdm, init_oh->_clk->clkdm);
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* _del_initiator_dep: allow @oh to smart-idle even if @init_oh is active
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* @oh: struct omap_hwmod *
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* Allow the hardware module @oh to enter idle while the hardare
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* module initiator @init_oh is active. Useful when a module will not
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* be accessed by a particular initiator (e.g., if a module will not
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* be accessed by the IVA, there should be no sleepdep between the IVA
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* initiator and the module). Only applies to modules in smart-idle
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* mode. If the clockdomain is marked as not needing autodeps, return
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* 0 without doing anything. Returns -EINVAL upon error or passes
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* along clkdm_del_sleepdep() value upon success.
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static int _del_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh)
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if (oh->_clk->clkdm && oh->_clk->clkdm->flags & CLKDM_NO_AUTODEPS)
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return clkdm_del_sleepdep(oh->_clk->clkdm, init_oh->_clk->clkdm);
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* _init_main_clk - get a struct clk * for the the hwmod's main functional clk
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* @oh: struct omap_hwmod *
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* Called from _init_clocks(). Populates the @oh _clk (main
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* functional clock pointer) if a main_clk is present. Returns 0 on
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* success or -EINVAL on error.
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static int _init_main_clk(struct omap_hwmod *oh)
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oh->_clk = omap_clk_get_by_name(oh->main_clk);
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pr_warning("omap_hwmod: %s: cannot clk_get main_clk %s\n",
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oh->name, oh->main_clk);
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if (!oh->_clk->clkdm)
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pr_warning("omap_hwmod: %s: missing clockdomain for %s.\n",
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oh->main_clk, oh->_clk->name);
531
* _init_interface_clks - get a struct clk * for the the hwmod's interface clks
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* @oh: struct omap_hwmod *
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* Called from _init_clocks(). Populates the @oh OCP slave interface
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* clock pointers. Returns 0 on success or -EINVAL on error.
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static int _init_interface_clks(struct omap_hwmod *oh)
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if (oh->slaves_cnt == 0)
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for (i = 0; i < oh->slaves_cnt; i++) {
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struct omap_hwmod_ocp_if *os = oh->slaves[i];
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c = omap_clk_get_by_name(os->clk);
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pr_warning("omap_hwmod: %s: cannot clk_get interface_clk %s\n",
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* _init_opt_clk - get a struct clk * for the the hwmod's optional clocks
566
* @oh: struct omap_hwmod *
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* Called from _init_clocks(). Populates the @oh omap_hwmod_opt_clk
569
* clock pointers. Returns 0 on success or -EINVAL on error.
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static int _init_opt_clks(struct omap_hwmod *oh)
573
struct omap_hwmod_opt_clk *oc;
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for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++) {
579
c = omap_clk_get_by_name(oc->clk);
581
pr_warning("omap_hwmod: %s: cannot clk_get opt_clk %s\n",
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* _enable_clocks - enable hwmod main clock and interface clocks
593
* @oh: struct omap_hwmod *
595
* Enables all clocks necessary for register reads and writes to succeed
596
* on the hwmod @oh. Returns 0.
598
static int _enable_clocks(struct omap_hwmod *oh)
602
pr_debug("omap_hwmod: %s: enabling clocks\n", oh->name);
605
clk_enable(oh->_clk);
607
if (oh->slaves_cnt > 0) {
608
for (i = 0; i < oh->slaves_cnt; i++) {
609
struct omap_hwmod_ocp_if *os = oh->slaves[i];
610
struct clk *c = os->_clk;
612
if (c && (os->flags & OCPIF_SWSUP_IDLE))
617
/* The opt clocks are controlled by the device driver. */
623
* _disable_clocks - disable hwmod main clock and interface clocks
624
* @oh: struct omap_hwmod *
626
* Disables the hwmod @oh main functional and interface clocks. Returns 0.
628
static int _disable_clocks(struct omap_hwmod *oh)
632
pr_debug("omap_hwmod: %s: disabling clocks\n", oh->name);
635
clk_disable(oh->_clk);
637
if (oh->slaves_cnt > 0) {
638
for (i = 0; i < oh->slaves_cnt; i++) {
639
struct omap_hwmod_ocp_if *os = oh->slaves[i];
640
struct clk *c = os->_clk;
642
if (c && (os->flags & OCPIF_SWSUP_IDLE))
647
/* The opt clocks are controlled by the device driver. */
652
static void _enable_optional_clocks(struct omap_hwmod *oh)
654
struct omap_hwmod_opt_clk *oc;
657
pr_debug("omap_hwmod: %s: enabling optional clocks\n", oh->name);
659
for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
661
pr_debug("omap_hwmod: enable %s:%s\n", oc->role,
663
clk_enable(oc->_clk);
667
static void _disable_optional_clocks(struct omap_hwmod *oh)
669
struct omap_hwmod_opt_clk *oc;
672
pr_debug("omap_hwmod: %s: disabling optional clocks\n", oh->name);
674
for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
676
pr_debug("omap_hwmod: disable %s:%s\n", oc->role,
678
clk_disable(oc->_clk);
683
* _enable_module - enable CLKCTRL modulemode on OMAP4
684
* @oh: struct omap_hwmod *
686
* Enables the PRCM module mode related to the hwmod @oh.
689
static void _enable_module(struct omap_hwmod *oh)
691
/* The module mode does not exist prior OMAP4 */
692
if (cpu_is_omap24xx() || cpu_is_omap34xx())
695
if (!oh->clkdm || !oh->prcm.omap4.modulemode)
698
pr_debug("omap_hwmod: %s: _enable_module: %d\n",
699
oh->name, oh->prcm.omap4.modulemode);
701
omap4_cminst_module_enable(oh->prcm.omap4.modulemode,
702
oh->clkdm->prcm_partition,
704
oh->clkdm->clkdm_offs,
705
oh->prcm.omap4.clkctrl_offs);
709
* _disable_module - enable CLKCTRL modulemode on OMAP4
710
* @oh: struct omap_hwmod *
712
* Disable the PRCM module mode related to the hwmod @oh.
715
static void _disable_module(struct omap_hwmod *oh)
717
/* The module mode does not exist prior OMAP4 */
718
if (cpu_is_omap24xx() || cpu_is_omap34xx())
721
if (!oh->clkdm || !oh->prcm.omap4.modulemode)
724
pr_debug("omap_hwmod: %s: _disable_module\n", oh->name);
726
omap4_cminst_module_disable(oh->clkdm->prcm_partition,
728
oh->clkdm->clkdm_offs,
729
oh->prcm.omap4.clkctrl_offs);
733
* _count_mpu_irqs - count the number of MPU IRQ lines associated with @oh
734
* @oh: struct omap_hwmod *oh
736
* Count and return the number of MPU IRQs associated with the hwmod
737
* @oh. Used to allocate struct resource data. Returns 0 if @oh is
740
static int _count_mpu_irqs(struct omap_hwmod *oh)
742
struct omap_hwmod_irq_info *ohii;
745
if (!oh || !oh->mpu_irqs)
749
ohii = &oh->mpu_irqs[i++];
750
} while (ohii->irq != -1);
756
* _count_sdma_reqs - count the number of SDMA request lines associated with @oh
757
* @oh: struct omap_hwmod *oh
759
* Count and return the number of SDMA request lines associated with
760
* the hwmod @oh. Used to allocate struct resource data. Returns 0
763
static int _count_sdma_reqs(struct omap_hwmod *oh)
765
struct omap_hwmod_dma_info *ohdi;
768
if (!oh || !oh->sdma_reqs)
772
ohdi = &oh->sdma_reqs[i++];
773
} while (ohdi->dma_req != -1);
779
* _count_ocp_if_addr_spaces - count the number of address space entries for @oh
780
* @oh: struct omap_hwmod *oh
782
* Count and return the number of address space ranges associated with
783
* the hwmod @oh. Used to allocate struct resource data. Returns 0
786
static int _count_ocp_if_addr_spaces(struct omap_hwmod_ocp_if *os)
788
struct omap_hwmod_addr_space *mem;
791
if (!os || !os->addr)
795
mem = &os->addr[i++];
796
} while (mem->pa_start != mem->pa_end);
802
* _find_mpu_port_index - find hwmod OCP slave port ID intended for MPU use
803
* @oh: struct omap_hwmod *
805
* Returns the array index of the OCP slave port that the MPU
806
* addresses the device on, or -EINVAL upon error or not found.
808
static int __init _find_mpu_port_index(struct omap_hwmod *oh)
813
if (!oh || oh->slaves_cnt == 0)
816
for (i = 0; i < oh->slaves_cnt; i++) {
817
struct omap_hwmod_ocp_if *os = oh->slaves[i];
819
if (os->user & OCP_USER_MPU) {
826
pr_debug("omap_hwmod: %s: MPU OCP slave port ID %d\n",
829
pr_debug("omap_hwmod: %s: no MPU OCP slave port found\n",
832
return (found) ? i : -EINVAL;
836
* _find_mpu_rt_base - find hwmod register target base addr accessible by MPU
837
* @oh: struct omap_hwmod *
839
* Return the virtual address of the base of the register target of
840
* device @oh, or NULL on error.
842
static void __iomem * __init _find_mpu_rt_base(struct omap_hwmod *oh, u8 index)
844
struct omap_hwmod_ocp_if *os;
845
struct omap_hwmod_addr_space *mem;
846
int i = 0, found = 0;
847
void __iomem *va_start;
849
if (!oh || oh->slaves_cnt == 0)
852
os = oh->slaves[index];
858
mem = &os->addr[i++];
859
if (mem->flags & ADDR_TYPE_RT)
861
} while (!found && mem->pa_start != mem->pa_end);
864
va_start = ioremap(mem->pa_start, mem->pa_end - mem->pa_start);
866
pr_err("omap_hwmod: %s: Could not ioremap\n", oh->name);
869
pr_debug("omap_hwmod: %s: MPU register target at va %p\n",
872
pr_debug("omap_hwmod: %s: no MPU register target found\n",
876
return (found) ? va_start : NULL;
880
* _enable_sysc - try to bring a module out of idle via OCP_SYSCONFIG
881
* @oh: struct omap_hwmod *
883
* If module is marked as SWSUP_SIDLE, force the module out of slave
884
* idle; otherwise, configure it for smart-idle. If module is marked
885
* as SWSUP_MSUSPEND, force the module out of master standby;
886
* otherwise, configure it for smart-standby. No return value.
888
static void _enable_sysc(struct omap_hwmod *oh)
893
if (!oh->class->sysc)
897
sf = oh->class->sysc->sysc_flags;
899
if (sf & SYSC_HAS_SIDLEMODE) {
900
idlemode = (oh->flags & HWMOD_SWSUP_SIDLE) ?
901
HWMOD_IDLEMODE_NO : HWMOD_IDLEMODE_SMART;
902
_set_slave_idlemode(oh, idlemode, &v);
905
if (sf & SYSC_HAS_MIDLEMODE) {
906
if (oh->flags & HWMOD_SWSUP_MSTANDBY) {
907
idlemode = HWMOD_IDLEMODE_NO;
909
if (sf & SYSC_HAS_ENAWAKEUP)
910
_enable_wakeup(oh, &v);
911
if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
912
idlemode = HWMOD_IDLEMODE_SMART_WKUP;
914
idlemode = HWMOD_IDLEMODE_SMART;
916
_set_master_standbymode(oh, idlemode, &v);
920
* XXX The clock framework should handle this, by
921
* calling into this code. But this must wait until the
922
* clock structures are tagged with omap_hwmod entries
924
if ((oh->flags & HWMOD_SET_DEFAULT_CLOCKACT) &&
925
(sf & SYSC_HAS_CLOCKACTIVITY))
926
_set_clockactivity(oh, oh->class->sysc->clockact, &v);
928
/* If slave is in SMARTIDLE, also enable wakeup */
929
if ((sf & SYSC_HAS_SIDLEMODE) && !(oh->flags & HWMOD_SWSUP_SIDLE))
930
_enable_wakeup(oh, &v);
932
_write_sysconfig(v, oh);
935
* Set the autoidle bit only after setting the smartidle bit
936
* Setting this will not have any impact on the other modules.
938
if (sf & SYSC_HAS_AUTOIDLE) {
939
idlemode = (oh->flags & HWMOD_NO_OCP_AUTOIDLE) ?
941
_set_module_autoidle(oh, idlemode, &v);
942
_write_sysconfig(v, oh);
947
* _idle_sysc - try to put a module into idle via OCP_SYSCONFIG
948
* @oh: struct omap_hwmod *
950
* If module is marked as SWSUP_SIDLE, force the module into slave
951
* idle; otherwise, configure it for smart-idle. If module is marked
952
* as SWSUP_MSUSPEND, force the module into master standby; otherwise,
953
* configure it for smart-standby. No return value.
955
static void _idle_sysc(struct omap_hwmod *oh)
960
if (!oh->class->sysc)
964
sf = oh->class->sysc->sysc_flags;
966
if (sf & SYSC_HAS_SIDLEMODE) {
967
idlemode = (oh->flags & HWMOD_SWSUP_SIDLE) ?
968
HWMOD_IDLEMODE_FORCE : HWMOD_IDLEMODE_SMART;
969
_set_slave_idlemode(oh, idlemode, &v);
972
if (sf & SYSC_HAS_MIDLEMODE) {
973
if (oh->flags & HWMOD_SWSUP_MSTANDBY) {
974
idlemode = HWMOD_IDLEMODE_FORCE;
976
if (sf & SYSC_HAS_ENAWAKEUP)
977
_enable_wakeup(oh, &v);
978
if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
979
idlemode = HWMOD_IDLEMODE_SMART_WKUP;
981
idlemode = HWMOD_IDLEMODE_SMART;
983
_set_master_standbymode(oh, idlemode, &v);
986
/* If slave is in SMARTIDLE, also enable wakeup */
987
if ((sf & SYSC_HAS_SIDLEMODE) && !(oh->flags & HWMOD_SWSUP_SIDLE))
988
_enable_wakeup(oh, &v);
990
_write_sysconfig(v, oh);
994
* _shutdown_sysc - force a module into idle via OCP_SYSCONFIG
995
* @oh: struct omap_hwmod *
997
* Force the module into slave idle and master suspend. No return
1000
static void _shutdown_sysc(struct omap_hwmod *oh)
1005
if (!oh->class->sysc)
1008
v = oh->_sysc_cache;
1009
sf = oh->class->sysc->sysc_flags;
1011
if (sf & SYSC_HAS_SIDLEMODE)
1012
_set_slave_idlemode(oh, HWMOD_IDLEMODE_FORCE, &v);
1014
if (sf & SYSC_HAS_MIDLEMODE)
1015
_set_master_standbymode(oh, HWMOD_IDLEMODE_FORCE, &v);
1017
if (sf & SYSC_HAS_AUTOIDLE)
1018
_set_module_autoidle(oh, 1, &v);
1020
_write_sysconfig(v, oh);
1024
* _lookup - find an omap_hwmod by name
1025
* @name: find an omap_hwmod by name
1027
* Return a pointer to an omap_hwmod by name, or NULL if not found.
1029
static struct omap_hwmod *_lookup(const char *name)
1031
struct omap_hwmod *oh, *temp_oh;
1035
list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
1036
if (!strcmp(name, temp_oh->name)) {
1045
* _init_clkdm - look up a clockdomain name, store pointer in omap_hwmod
1046
* @oh: struct omap_hwmod *
1048
* Convert a clockdomain name stored in a struct omap_hwmod into a
1049
* clockdomain pointer, and save it into the struct omap_hwmod.
1050
* return -EINVAL if clkdm_name does not exist or if the lookup failed.
1052
static int _init_clkdm(struct omap_hwmod *oh)
1054
if (cpu_is_omap24xx() || cpu_is_omap34xx())
1057
if (!oh->clkdm_name) {
1058
pr_warning("omap_hwmod: %s: no clkdm_name\n", oh->name);
1062
oh->clkdm = clkdm_lookup(oh->clkdm_name);
1064
pr_warning("omap_hwmod: %s: could not associate to clkdm %s\n",
1065
oh->name, oh->clkdm_name);
1069
pr_debug("omap_hwmod: %s: associated to clkdm %s\n",
1070
oh->name, oh->clkdm_name);
1076
* _init_clocks - clk_get() all clocks associated with this hwmod. Retrieve as
1077
* well the clockdomain.
1078
* @oh: struct omap_hwmod *
1079
* @data: not used; pass NULL
1081
* Called by omap_hwmod_setup_*() (after omap2_clk_init()).
1082
* Resolves all clock names embedded in the hwmod. Returns 0 on
1083
* success, or a negative error code on failure.
1085
static int _init_clocks(struct omap_hwmod *oh, void *data)
1089
if (oh->_state != _HWMOD_STATE_REGISTERED)
1092
pr_debug("omap_hwmod: %s: looking up clocks\n", oh->name);
1094
ret |= _init_main_clk(oh);
1095
ret |= _init_interface_clks(oh);
1096
ret |= _init_opt_clks(oh);
1097
ret |= _init_clkdm(oh);
1100
oh->_state = _HWMOD_STATE_CLKS_INITED;
1102
pr_warning("omap_hwmod: %s: cannot _init_clocks\n", oh->name);
1108
* _wait_target_ready - wait for a module to leave slave idle
1109
* @oh: struct omap_hwmod *
1111
* Wait for a module @oh to leave slave idle. Returns 0 if the module
1112
* does not have an IDLEST bit or if the module successfully leaves
1113
* slave idle; otherwise, pass along the return value of the
1114
* appropriate *_cm*_wait_module_ready() function.
1116
static int _wait_target_ready(struct omap_hwmod *oh)
1118
struct omap_hwmod_ocp_if *os;
1124
if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
1127
os = oh->slaves[oh->_mpu_port_index];
1129
if (oh->flags & HWMOD_NO_IDLEST)
1132
/* XXX check module SIDLEMODE */
1134
/* XXX check clock enable states */
1136
if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
1137
ret = omap2_cm_wait_module_ready(oh->prcm.omap2.module_offs,
1138
oh->prcm.omap2.idlest_reg_id,
1139
oh->prcm.omap2.idlest_idle_bit);
1140
} else if (cpu_is_omap44xx()) {
1144
ret = omap4_cminst_wait_module_ready(oh->clkdm->prcm_partition,
1146
oh->clkdm->clkdm_offs,
1147
oh->prcm.omap4.clkctrl_offs);
1156
* _wait_target_disable - wait for a module to be disabled
1157
* @oh: struct omap_hwmod *
1159
* Wait for a module @oh to enter slave idle. Returns 0 if the module
1160
* does not have an IDLEST bit or if the module successfully enters
1161
* slave idle; otherwise, pass along the return value of the
1162
* appropriate *_cm*_wait_module_idle() function.
1164
static int _wait_target_disable(struct omap_hwmod *oh)
1166
/* TODO: For now just handle OMAP4+ */
1167
if (cpu_is_omap24xx() || cpu_is_omap34xx())
1173
if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
1176
if (oh->flags & HWMOD_NO_IDLEST)
1179
return omap4_cminst_wait_module_idle(oh->clkdm->prcm_partition,
1181
oh->clkdm->clkdm_offs,
1182
oh->prcm.omap4.clkctrl_offs);
1186
* _lookup_hardreset - fill register bit info for this hwmod/reset line
1187
* @oh: struct omap_hwmod *
1188
* @name: name of the reset line in the context of this hwmod
1189
* @ohri: struct omap_hwmod_rst_info * that this function will fill in
1191
* Return the bit position of the reset line that match the
1192
* input name. Return -ENOENT if not found.
1194
static u8 _lookup_hardreset(struct omap_hwmod *oh, const char *name,
1195
struct omap_hwmod_rst_info *ohri)
1199
for (i = 0; i < oh->rst_lines_cnt; i++) {
1200
const char *rst_line = oh->rst_lines[i].name;
1201
if (!strcmp(rst_line, name)) {
1202
ohri->rst_shift = oh->rst_lines[i].rst_shift;
1203
ohri->st_shift = oh->rst_lines[i].st_shift;
1204
pr_debug("omap_hwmod: %s: %s: %s: rst %d st %d\n",
1205
oh->name, __func__, rst_line, ohri->rst_shift,
1216
* _assert_hardreset - assert the HW reset line of submodules
1217
* contained in the hwmod module.
1218
* @oh: struct omap_hwmod *
1219
* @name: name of the reset line to lookup and assert
1221
* Some IP like dsp, ipu or iva contain processor that require
1222
* an HW reset line to be assert / deassert in order to enable fully
1225
static int _assert_hardreset(struct omap_hwmod *oh, const char *name)
1227
struct omap_hwmod_rst_info ohri;
1233
ret = _lookup_hardreset(oh, name, &ohri);
1234
if (IS_ERR_VALUE(ret))
1237
if (cpu_is_omap24xx() || cpu_is_omap34xx())
1238
return omap2_prm_assert_hardreset(oh->prcm.omap2.module_offs,
1240
else if (cpu_is_omap44xx())
1241
return omap4_prminst_assert_hardreset(ohri.rst_shift,
1242
oh->clkdm->pwrdm.ptr->prcm_partition,
1243
oh->clkdm->pwrdm.ptr->prcm_offs,
1244
oh->prcm.omap4.rstctrl_offs);
1250
* _deassert_hardreset - deassert the HW reset line of submodules contained
1251
* in the hwmod module.
1252
* @oh: struct omap_hwmod *
1253
* @name: name of the reset line to look up and deassert
1255
* Some IP like dsp, ipu or iva contain processor that require
1256
* an HW reset line to be assert / deassert in order to enable fully
1259
static int _deassert_hardreset(struct omap_hwmod *oh, const char *name)
1261
struct omap_hwmod_rst_info ohri;
1267
ret = _lookup_hardreset(oh, name, &ohri);
1268
if (IS_ERR_VALUE(ret))
1271
if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
1272
ret = omap2_prm_deassert_hardreset(oh->prcm.omap2.module_offs,
1275
} else if (cpu_is_omap44xx()) {
1277
pr_err("omap_hwmod: %s: %s: hwmod data error: OMAP4 does not support st_shift\n",
1279
ret = omap4_prminst_deassert_hardreset(ohri.rst_shift,
1280
oh->clkdm->pwrdm.ptr->prcm_partition,
1281
oh->clkdm->pwrdm.ptr->prcm_offs,
1282
oh->prcm.omap4.rstctrl_offs);
1288
pr_warning("omap_hwmod: %s: failed to hardreset\n", oh->name);
1294
* _read_hardreset - read the HW reset line state of submodules
1295
* contained in the hwmod module
1296
* @oh: struct omap_hwmod *
1297
* @name: name of the reset line to look up and read
1299
* Return the state of the reset line.
1301
static int _read_hardreset(struct omap_hwmod *oh, const char *name)
1303
struct omap_hwmod_rst_info ohri;
1309
ret = _lookup_hardreset(oh, name, &ohri);
1310
if (IS_ERR_VALUE(ret))
1313
if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
1314
return omap2_prm_is_hardreset_asserted(oh->prcm.omap2.module_offs,
1316
} else if (cpu_is_omap44xx()) {
1317
return omap4_prminst_is_hardreset_asserted(ohri.rst_shift,
1318
oh->clkdm->pwrdm.ptr->prcm_partition,
1319
oh->clkdm->pwrdm.ptr->prcm_offs,
1320
oh->prcm.omap4.rstctrl_offs);
1327
* _ocp_softreset - reset an omap_hwmod via the OCP_SYSCONFIG bit
1328
* @oh: struct omap_hwmod *
1330
* Resets an omap_hwmod @oh via the OCP_SYSCONFIG bit. hwmod must be
1331
* enabled for this to work. Returns -EINVAL if the hwmod cannot be
1332
* reset this way or if the hwmod is in the wrong state, -ETIMEDOUT if
1333
* the module did not reset in time, or 0 upon success.
1335
* In OMAP3 a specific SYSSTATUS register is used to get the reset status.
1336
* Starting in OMAP4, some IPs do not have SYSSTATUS registers and instead
1337
* use the SYSCONFIG softreset bit to provide the status.
1339
* Note that some IP like McBSP do have reset control but don't have
1342
static int _ocp_softreset(struct omap_hwmod *oh)
1348
if (!oh->class->sysc ||
1349
!(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET))
1352
/* clocks must be on for this operation */
1353
if (oh->_state != _HWMOD_STATE_ENABLED) {
1354
pr_warning("omap_hwmod: %s: reset can only be entered from "
1355
"enabled state\n", oh->name);
1359
/* For some modules, all optionnal clocks need to be enabled as well */
1360
if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1361
_enable_optional_clocks(oh);
1363
pr_debug("omap_hwmod: %s: resetting via OCP SOFTRESET\n", oh->name);
1365
v = oh->_sysc_cache;
1366
ret = _set_softreset(oh, &v);
1369
_write_sysconfig(v, oh);
1371
if (oh->class->sysc->sysc_flags & SYSS_HAS_RESET_STATUS)
1372
omap_test_timeout((omap_hwmod_read(oh,
1373
oh->class->sysc->syss_offs)
1374
& SYSS_RESETDONE_MASK),
1375
MAX_MODULE_SOFTRESET_WAIT, c);
1376
else if (oh->class->sysc->sysc_flags & SYSC_HAS_RESET_STATUS)
1377
omap_test_timeout(!(omap_hwmod_read(oh,
1378
oh->class->sysc->sysc_offs)
1379
& SYSC_TYPE2_SOFTRESET_MASK),
1380
MAX_MODULE_SOFTRESET_WAIT, c);
1382
if (c == MAX_MODULE_SOFTRESET_WAIT)
1383
pr_warning("omap_hwmod: %s: softreset failed (waited %d usec)\n",
1384
oh->name, MAX_MODULE_SOFTRESET_WAIT);
1386
pr_debug("omap_hwmod: %s: softreset in %d usec\n", oh->name, c);
1389
* XXX add _HWMOD_STATE_WEDGED for modules that don't come back from
1390
* _wait_target_ready() or _reset()
1393
ret = (c == MAX_MODULE_SOFTRESET_WAIT) ? -ETIMEDOUT : 0;
1396
if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1397
_disable_optional_clocks(oh);
1403
* _reset - reset an omap_hwmod
1404
* @oh: struct omap_hwmod *
1406
* Resets an omap_hwmod @oh. The default software reset mechanism for
1407
* most OMAP IP blocks is triggered via the OCP_SYSCONFIG.SOFTRESET
1408
* bit. However, some hwmods cannot be reset via this method: some
1409
* are not targets and therefore have no OCP header registers to
1410
* access; others (like the IVA) have idiosyncratic reset sequences.
1411
* So for these relatively rare cases, custom reset code can be
1412
* supplied in the struct omap_hwmod_class .reset function pointer.
1413
* Passes along the return value from either _reset() or the custom
1414
* reset function - these must return -EINVAL if the hwmod cannot be
1415
* reset this way or if the hwmod is in the wrong state, -ETIMEDOUT if
1416
* the module did not reset in time, or 0 upon success.
1418
static int _reset(struct omap_hwmod *oh)
1422
pr_debug("omap_hwmod: %s: resetting\n", oh->name);
1424
ret = (oh->class->reset) ? oh->class->reset(oh) : _ocp_softreset(oh);
1430
* _enable - enable an omap_hwmod
1431
* @oh: struct omap_hwmod *
1433
* Enables an omap_hwmod @oh such that the MPU can access the hwmod's
1434
* register target. Returns -EINVAL if the hwmod is in the wrong
1435
* state or passes along the return value of _wait_target_ready().
1437
static int _enable(struct omap_hwmod *oh)
1442
pr_debug("omap_hwmod: %s: enabling\n", oh->name);
1444
if (oh->_state != _HWMOD_STATE_INITIALIZED &&
1445
oh->_state != _HWMOD_STATE_IDLE &&
1446
oh->_state != _HWMOD_STATE_DISABLED) {
1447
WARN(1, "omap_hwmod: %s: enabled state can only be entered "
1448
"from initialized, idle, or disabled state\n", oh->name);
1454
* If an IP contains only one HW reset line, then de-assert it in order
1455
* to allow the module state transition. Otherwise the PRCM will return
1456
* Intransition status, and the init will failed.
1458
if ((oh->_state == _HWMOD_STATE_INITIALIZED ||
1459
oh->_state == _HWMOD_STATE_DISABLED) && oh->rst_lines_cnt == 1)
1460
_deassert_hardreset(oh, oh->rst_lines[0].name);
1462
/* Mux pins for device runtime if populated */
1463
if (oh->mux && (!oh->mux->enabled ||
1464
((oh->_state == _HWMOD_STATE_IDLE) &&
1465
oh->mux->pads_dynamic)))
1466
omap_hwmod_mux(oh->mux, _HWMOD_STATE_ENABLED);
1468
_add_initiator_dep(oh, mpu_oh);
1472
* A clockdomain must be in SW_SUP before enabling
1473
* completely the module. The clockdomain can be set
1474
* in HW_AUTO only when the module become ready.
1476
hwsup = clkdm_in_hwsup(oh->clkdm);
1477
r = clkdm_hwmod_enable(oh->clkdm, oh);
1479
WARN(1, "omap_hwmod: %s: could not enable clockdomain %s: %d\n",
1480
oh->name, oh->clkdm->name, r);
1488
r = _wait_target_ready(oh);
1491
* Set the clockdomain to HW_AUTO only if the target is ready,
1492
* assuming that the previous state was HW_AUTO
1494
if (oh->clkdm && hwsup)
1495
clkdm_allow_idle(oh->clkdm);
1497
oh->_state = _HWMOD_STATE_ENABLED;
1499
/* Access the sysconfig only if the target is ready */
1500
if (oh->class->sysc) {
1501
if (!(oh->_int_flags & _HWMOD_SYSCONFIG_LOADED))
1502
_update_sysc_cache(oh);
1506
_disable_clocks(oh);
1507
pr_debug("omap_hwmod: %s: _wait_target_ready: %d\n",
1511
clkdm_hwmod_disable(oh->clkdm, oh);
1518
* _idle - idle an omap_hwmod
1519
* @oh: struct omap_hwmod *
1521
* Idles an omap_hwmod @oh. This should be called once the hwmod has
1522
* no further work. Returns -EINVAL if the hwmod is in the wrong
1523
* state or returns 0.
1525
static int _idle(struct omap_hwmod *oh)
1529
pr_debug("omap_hwmod: %s: idling\n", oh->name);
1531
if (oh->_state != _HWMOD_STATE_ENABLED) {
1532
WARN(1, "omap_hwmod: %s: idle state can only be entered from "
1533
"enabled state\n", oh->name);
1537
if (oh->class->sysc)
1539
_del_initiator_dep(oh, mpu_oh);
1540
_disable_module(oh);
1541
ret = _wait_target_disable(oh);
1543
pr_warn("omap_hwmod: %s: _wait_target_disable failed\n",
1546
* The module must be in idle mode before disabling any parents
1547
* clocks. Otherwise, the parent clock might be disabled before
1548
* the module transition is done, and thus will prevent the
1549
* transition to complete properly.
1551
_disable_clocks(oh);
1553
clkdm_hwmod_disable(oh->clkdm, oh);
1555
/* Mux pins for device idle if populated */
1556
if (oh->mux && oh->mux->pads_dynamic)
1557
omap_hwmod_mux(oh->mux, _HWMOD_STATE_IDLE);
1559
oh->_state = _HWMOD_STATE_IDLE;
1565
* omap_hwmod_set_ocp_autoidle - set the hwmod's OCP autoidle bit
1566
* @oh: struct omap_hwmod *
1567
* @autoidle: desired AUTOIDLE bitfield value (0 or 1)
1569
* Sets the IP block's OCP autoidle bit in hardware, and updates our
1570
* local copy. Intended to be used by drivers that require
1571
* direct manipulation of the AUTOIDLE bits.
1572
* Returns -EINVAL if @oh is null or is not in the ENABLED state, or passes
1573
* along the return value from _set_module_autoidle().
1575
* Any users of this function should be scrutinized carefully.
1577
int omap_hwmod_set_ocp_autoidle(struct omap_hwmod *oh, u8 autoidle)
1581
unsigned long flags;
1583
if (!oh || oh->_state != _HWMOD_STATE_ENABLED)
1586
spin_lock_irqsave(&oh->_lock, flags);
1588
v = oh->_sysc_cache;
1590
retval = _set_module_autoidle(oh, autoidle, &v);
1593
_write_sysconfig(v, oh);
1595
spin_unlock_irqrestore(&oh->_lock, flags);
1601
* _shutdown - shutdown an omap_hwmod
1602
* @oh: struct omap_hwmod *
1604
* Shut down an omap_hwmod @oh. This should be called when the driver
1605
* used for the hwmod is removed or unloaded or if the driver is not
1606
* used by the system. Returns -EINVAL if the hwmod is in the wrong
1607
* state or returns 0.
1609
static int _shutdown(struct omap_hwmod *oh)
1614
if (oh->_state != _HWMOD_STATE_IDLE &&
1615
oh->_state != _HWMOD_STATE_ENABLED) {
1616
WARN(1, "omap_hwmod: %s: disabled state can only be entered "
1617
"from idle, or enabled state\n", oh->name);
1621
pr_debug("omap_hwmod: %s: disabling\n", oh->name);
1623
if (oh->class->pre_shutdown) {
1624
prev_state = oh->_state;
1625
if (oh->_state == _HWMOD_STATE_IDLE)
1627
ret = oh->class->pre_shutdown(oh);
1629
if (prev_state == _HWMOD_STATE_IDLE)
1635
if (oh->class->sysc) {
1636
if (oh->_state == _HWMOD_STATE_IDLE)
1641
/* clocks and deps are already disabled in idle */
1642
if (oh->_state == _HWMOD_STATE_ENABLED) {
1643
_del_initiator_dep(oh, mpu_oh);
1644
/* XXX what about the other system initiators here? dma, dsp */
1645
_disable_module(oh);
1646
ret = _wait_target_disable(oh);
1648
pr_warn("omap_hwmod: %s: _wait_target_disable failed\n",
1650
_disable_clocks(oh);
1652
clkdm_hwmod_disable(oh->clkdm, oh);
1654
/* XXX Should this code also force-disable the optional clocks? */
1657
* If an IP contains only one HW reset line, then assert it
1658
* after disabling the clocks and before shutting down the IP.
1660
if (oh->rst_lines_cnt == 1)
1661
_assert_hardreset(oh, oh->rst_lines[0].name);
1663
/* Mux pins to safe mode or use populated off mode values */
1665
omap_hwmod_mux(oh->mux, _HWMOD_STATE_DISABLED);
1667
oh->_state = _HWMOD_STATE_DISABLED;
1673
* _setup - do initial configuration of omap_hwmod
1674
* @oh: struct omap_hwmod *
1676
* Writes the CLOCKACTIVITY bits @clockact to the hwmod @oh
1677
* OCP_SYSCONFIG register. Returns 0.
1679
static int _setup(struct omap_hwmod *oh, void *data)
1684
if (oh->_state != _HWMOD_STATE_CLKS_INITED)
1687
/* Set iclk autoidle mode */
1688
if (oh->slaves_cnt > 0) {
1689
for (i = 0; i < oh->slaves_cnt; i++) {
1690
struct omap_hwmod_ocp_if *os = oh->slaves[i];
1691
struct clk *c = os->_clk;
1696
if (os->flags & OCPIF_SWSUP_IDLE) {
1697
/* XXX omap_iclk_deny_idle(c); */
1699
/* XXX omap_iclk_allow_idle(c); */
1705
oh->_state = _HWMOD_STATE_INITIALIZED;
1708
* In the case of hwmod with hardreset that should not be
1709
* de-assert at boot time, we have to keep the module
1710
* initialized, because we cannot enable it properly with the
1711
* reset asserted. Exit without warning because that behavior is
1714
if ((oh->flags & HWMOD_INIT_NO_RESET) && oh->rst_lines_cnt == 1)
1719
pr_warning("omap_hwmod: %s: cannot be enabled (%d)\n",
1720
oh->name, oh->_state);
1724
if (!(oh->flags & HWMOD_INIT_NO_RESET)) {
1728
* OCP_SYSCONFIG bits need to be reprogrammed after a softreset.
1729
* The _enable() function should be split to
1730
* avoid the rewrite of the OCP_SYSCONFIG register.
1732
if (oh->class->sysc) {
1733
_update_sysc_cache(oh);
1738
postsetup_state = oh->_postsetup_state;
1739
if (postsetup_state == _HWMOD_STATE_UNKNOWN)
1740
postsetup_state = _HWMOD_STATE_ENABLED;
1743
* XXX HWMOD_INIT_NO_IDLE does not belong in hwmod data -
1744
* it should be set by the core code as a runtime flag during startup
1746
if ((oh->flags & HWMOD_INIT_NO_IDLE) &&
1747
(postsetup_state == _HWMOD_STATE_IDLE))
1748
postsetup_state = _HWMOD_STATE_ENABLED;
1750
if (postsetup_state == _HWMOD_STATE_IDLE)
1752
else if (postsetup_state == _HWMOD_STATE_DISABLED)
1754
else if (postsetup_state != _HWMOD_STATE_ENABLED)
1755
WARN(1, "hwmod: %s: unknown postsetup state %d! defaulting to enabled\n",
1756
oh->name, postsetup_state);
1762
* _register - register a struct omap_hwmod
1763
* @oh: struct omap_hwmod *
1765
* Registers the omap_hwmod @oh. Returns -EEXIST if an omap_hwmod
1766
* already has been registered by the same name; -EINVAL if the
1767
* omap_hwmod is in the wrong state, if @oh is NULL, if the
1768
* omap_hwmod's class field is NULL; if the omap_hwmod is missing a
1769
* name, or if the omap_hwmod's class is missing a name; or 0 upon
1772
* XXX The data should be copied into bootmem, so the original data
1773
* should be marked __initdata and freed after init. This would allow
1774
* unneeded omap_hwmods to be freed on multi-OMAP configurations. Note
1775
* that the copy process would be relatively complex due to the large number
1778
static int __init _register(struct omap_hwmod *oh)
1782
if (!oh || !oh->name || !oh->class || !oh->class->name ||
1783
(oh->_state != _HWMOD_STATE_UNKNOWN))
1786
pr_debug("omap_hwmod: %s: registering\n", oh->name);
1788
if (_lookup(oh->name))
1791
ms_id = _find_mpu_port_index(oh);
1792
if (!IS_ERR_VALUE(ms_id))
1793
oh->_mpu_port_index = ms_id;
1795
oh->_int_flags |= _HWMOD_NO_MPU_PORT;
1797
list_add_tail(&oh->node, &omap_hwmod_list);
1799
spin_lock_init(&oh->_lock);
1801
oh->_state = _HWMOD_STATE_REGISTERED;
1804
* XXX Rather than doing a strcmp(), this should test a flag
1805
* set in the hwmod data, inserted by the autogenerator code.
1807
if (!strcmp(oh->name, MPU_INITIATOR_NAME))
1814
/* Public functions */
1816
u32 omap_hwmod_read(struct omap_hwmod *oh, u16 reg_offs)
1818
if (oh->flags & HWMOD_16BIT_REG)
1819
return __raw_readw(oh->_mpu_rt_va + reg_offs);
1821
return __raw_readl(oh->_mpu_rt_va + reg_offs);
1824
void omap_hwmod_write(u32 v, struct omap_hwmod *oh, u16 reg_offs)
1826
if (oh->flags & HWMOD_16BIT_REG)
1827
__raw_writew(v, oh->_mpu_rt_va + reg_offs);
1829
__raw_writel(v, oh->_mpu_rt_va + reg_offs);
1833
* omap_hwmod_softreset - reset a module via SYSCONFIG.SOFTRESET bit
1834
* @oh: struct omap_hwmod *
1836
* This is a public function exposed to drivers. Some drivers may need to do
1837
* some settings before and after resetting the device. Those drivers after
1838
* doing the necessary settings could use this function to start a reset by
1839
* setting the SYSCONFIG.SOFTRESET bit.
1841
int omap_hwmod_softreset(struct omap_hwmod *oh)
1846
if (!oh || !(oh->_sysc_cache))
1849
v = oh->_sysc_cache;
1850
ret = _set_softreset(oh, &v);
1853
_write_sysconfig(v, oh);
1860
* omap_hwmod_set_slave_idlemode - set the hwmod's OCP slave idlemode
1861
* @oh: struct omap_hwmod *
1862
* @idlemode: SIDLEMODE field bits (shifted to bit 0)
1864
* Sets the IP block's OCP slave idlemode in hardware, and updates our
1865
* local copy. Intended to be used by drivers that have some erratum
1866
* that requires direct manipulation of the SIDLEMODE bits. Returns
1867
* -EINVAL if @oh is null, or passes along the return value from
1868
* _set_slave_idlemode().
1870
* XXX Does this function have any current users? If not, we should
1871
* remove it; it is better to let the rest of the hwmod code handle this.
1872
* Any users of this function should be scrutinized carefully.
1874
int omap_hwmod_set_slave_idlemode(struct omap_hwmod *oh, u8 idlemode)
1882
v = oh->_sysc_cache;
1884
retval = _set_slave_idlemode(oh, idlemode, &v);
1886
_write_sysconfig(v, oh);
1892
* omap_hwmod_lookup - look up a registered omap_hwmod by name
1893
* @name: name of the omap_hwmod to look up
1895
* Given a @name of an omap_hwmod, return a pointer to the registered
1896
* struct omap_hwmod *, or NULL upon error.
1898
struct omap_hwmod *omap_hwmod_lookup(const char *name)
1900
struct omap_hwmod *oh;
1911
* omap_hwmod_for_each - call function for each registered omap_hwmod
1912
* @fn: pointer to a callback function
1913
* @data: void * data to pass to callback function
1915
* Call @fn for each registered omap_hwmod, passing @data to each
1916
* function. @fn must return 0 for success or any other value for
1917
* failure. If @fn returns non-zero, the iteration across omap_hwmods
1918
* will stop and the non-zero return value will be passed to the
1919
* caller of omap_hwmod_for_each(). @fn is called with
1920
* omap_hwmod_for_each() held.
1922
int omap_hwmod_for_each(int (*fn)(struct omap_hwmod *oh, void *data),
1925
struct omap_hwmod *temp_oh;
1931
list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
1932
ret = (*fn)(temp_oh, data);
1941
* omap_hwmod_register - register an array of hwmods
1942
* @ohs: pointer to an array of omap_hwmods to register
1944
* Intended to be called early in boot before the clock framework is
1945
* initialized. If @ohs is not null, will register all omap_hwmods
1946
* listed in @ohs that are valid for this chip. Returns 0.
1948
int __init omap_hwmod_register(struct omap_hwmod **ohs)
1957
r = _register(ohs[i]);
1958
WARN(r, "omap_hwmod: %s: _register returned %d\n", ohs[i]->name,
1966
* _populate_mpu_rt_base - populate the virtual address for a hwmod
1968
* Must be called only from omap_hwmod_setup_*() so ioremap works properly.
1969
* Assumes the caller takes care of locking if needed.
1971
static int __init _populate_mpu_rt_base(struct omap_hwmod *oh, void *data)
1973
if (oh->_state != _HWMOD_STATE_REGISTERED)
1976
if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
1979
oh->_mpu_rt_va = _find_mpu_rt_base(oh, oh->_mpu_port_index);
1985
* omap_hwmod_setup_one - set up a single hwmod
1986
* @oh_name: const char * name of the already-registered hwmod to set up
1988
* Must be called after omap2_clk_init(). Resolves the struct clk
1989
* names to struct clk pointers for each registered omap_hwmod. Also
1990
* calls _setup() on each hwmod. Returns -EINVAL upon error or 0 upon
1993
int __init omap_hwmod_setup_one(const char *oh_name)
1995
struct omap_hwmod *oh;
1998
pr_debug("omap_hwmod: %s: %s\n", oh_name, __func__);
2001
pr_err("omap_hwmod: %s: cannot setup_one: MPU initiator hwmod %s not yet registered\n",
2002
oh_name, MPU_INITIATOR_NAME);
2006
oh = _lookup(oh_name);
2008
WARN(1, "omap_hwmod: %s: hwmod not yet registered\n", oh_name);
2012
if (mpu_oh->_state == _HWMOD_STATE_REGISTERED && oh != mpu_oh)
2013
omap_hwmod_setup_one(MPU_INITIATOR_NAME);
2015
r = _populate_mpu_rt_base(oh, NULL);
2016
if (IS_ERR_VALUE(r)) {
2017
WARN(1, "omap_hwmod: %s: couldn't set mpu_rt_base\n", oh_name);
2021
r = _init_clocks(oh, NULL);
2022
if (IS_ERR_VALUE(r)) {
2023
WARN(1, "omap_hwmod: %s: couldn't init clocks\n", oh_name);
2033
* omap_hwmod_setup - do some post-clock framework initialization
2035
* Must be called after omap2_clk_init(). Resolves the struct clk names
2036
* to struct clk pointers for each registered omap_hwmod. Also calls
2037
* _setup() on each hwmod. Returns 0 upon success.
2039
static int __init omap_hwmod_setup_all(void)
2044
pr_err("omap_hwmod: %s: MPU initiator hwmod %s not yet registered\n",
2045
__func__, MPU_INITIATOR_NAME);
2049
r = omap_hwmod_for_each(_populate_mpu_rt_base, NULL);
2051
r = omap_hwmod_for_each(_init_clocks, NULL);
2052
WARN(IS_ERR_VALUE(r),
2053
"omap_hwmod: %s: _init_clocks failed\n", __func__);
2055
omap_hwmod_for_each(_setup, NULL);
2059
core_initcall(omap_hwmod_setup_all);
2062
* omap_hwmod_enable - enable an omap_hwmod
2063
* @oh: struct omap_hwmod *
2065
* Enable an omap_hwmod @oh. Intended to be called by omap_device_enable().
2066
* Returns -EINVAL on error or passes along the return value from _enable().
2068
int omap_hwmod_enable(struct omap_hwmod *oh)
2071
unsigned long flags;
2076
spin_lock_irqsave(&oh->_lock, flags);
2078
spin_unlock_irqrestore(&oh->_lock, flags);
2084
* omap_hwmod_idle - idle an omap_hwmod
2085
* @oh: struct omap_hwmod *
2087
* Idle an omap_hwmod @oh. Intended to be called by omap_device_idle().
2088
* Returns -EINVAL on error or passes along the return value from _idle().
2090
int omap_hwmod_idle(struct omap_hwmod *oh)
2092
unsigned long flags;
2097
spin_lock_irqsave(&oh->_lock, flags);
2099
spin_unlock_irqrestore(&oh->_lock, flags);
2105
* omap_hwmod_shutdown - shutdown an omap_hwmod
2106
* @oh: struct omap_hwmod *
2108
* Shutdown an omap_hwmod @oh. Intended to be called by
2109
* omap_device_shutdown(). Returns -EINVAL on error or passes along
2110
* the return value from _shutdown().
2112
int omap_hwmod_shutdown(struct omap_hwmod *oh)
2114
unsigned long flags;
2119
spin_lock_irqsave(&oh->_lock, flags);
2121
spin_unlock_irqrestore(&oh->_lock, flags);
2127
* omap_hwmod_enable_clocks - enable main_clk, all interface clocks
2128
* @oh: struct omap_hwmod *oh
2130
* Intended to be called by the omap_device code.
2132
int omap_hwmod_enable_clocks(struct omap_hwmod *oh)
2134
unsigned long flags;
2136
spin_lock_irqsave(&oh->_lock, flags);
2138
spin_unlock_irqrestore(&oh->_lock, flags);
2144
* omap_hwmod_disable_clocks - disable main_clk, all interface clocks
2145
* @oh: struct omap_hwmod *oh
2147
* Intended to be called by the omap_device code.
2149
int omap_hwmod_disable_clocks(struct omap_hwmod *oh)
2151
unsigned long flags;
2153
spin_lock_irqsave(&oh->_lock, flags);
2154
_disable_clocks(oh);
2155
spin_unlock_irqrestore(&oh->_lock, flags);
2161
* omap_hwmod_ocp_barrier - wait for posted writes against the hwmod to complete
2162
* @oh: struct omap_hwmod *oh
2164
* Intended to be called by drivers and core code when all posted
2165
* writes to a device must complete before continuing further
2166
* execution (for example, after clearing some device IRQSTATUS
2169
* XXX what about targets with multiple OCP threads?
2171
void omap_hwmod_ocp_barrier(struct omap_hwmod *oh)
2175
if (!oh->class->sysc || !oh->class->sysc->sysc_flags) {
2176
WARN(1, "omap_device: %s: OCP barrier impossible due to "
2177
"device configuration\n", oh->name);
2182
* Forces posted writes to complete on the OCP thread handling
2185
omap_hwmod_read(oh, oh->class->sysc->sysc_offs);
2189
* omap_hwmod_reset - reset the hwmod
2190
* @oh: struct omap_hwmod *
2192
* Under some conditions, a driver may wish to reset the entire device.
2193
* Called from omap_device code. Returns -EINVAL on error or passes along
2194
* the return value from _reset().
2196
int omap_hwmod_reset(struct omap_hwmod *oh)
2199
unsigned long flags;
2204
spin_lock_irqsave(&oh->_lock, flags);
2206
spin_unlock_irqrestore(&oh->_lock, flags);
2212
* omap_hwmod_count_resources - count number of struct resources needed by hwmod
2213
* @oh: struct omap_hwmod *
2214
* @res: pointer to the first element of an array of struct resource to fill
2216
* Count the number of struct resource array elements necessary to
2217
* contain omap_hwmod @oh resources. Intended to be called by code
2218
* that registers omap_devices. Intended to be used to determine the
2219
* size of a dynamically-allocated struct resource array, before
2220
* calling omap_hwmod_fill_resources(). Returns the number of struct
2221
* resource array elements needed.
2223
* XXX This code is not optimized. It could attempt to merge adjacent
2227
int omap_hwmod_count_resources(struct omap_hwmod *oh)
2231
ret = _count_mpu_irqs(oh) + _count_sdma_reqs(oh);
2233
for (i = 0; i < oh->slaves_cnt; i++)
2234
ret += _count_ocp_if_addr_spaces(oh->slaves[i]);
2240
* omap_hwmod_fill_resources - fill struct resource array with hwmod data
2241
* @oh: struct omap_hwmod *
2242
* @res: pointer to the first element of an array of struct resource to fill
2244
* Fill the struct resource array @res with resource data from the
2245
* omap_hwmod @oh. Intended to be called by code that registers
2246
* omap_devices. See also omap_hwmod_count_resources(). Returns the
2247
* number of array elements filled.
2249
int omap_hwmod_fill_resources(struct omap_hwmod *oh, struct resource *res)
2251
int i, j, mpu_irqs_cnt, sdma_reqs_cnt;
2254
/* For each IRQ, DMA, memory area, fill in array.*/
2256
mpu_irqs_cnt = _count_mpu_irqs(oh);
2257
for (i = 0; i < mpu_irqs_cnt; i++) {
2258
(res + r)->name = (oh->mpu_irqs + i)->name;
2259
(res + r)->start = (oh->mpu_irqs + i)->irq;
2260
(res + r)->end = (oh->mpu_irqs + i)->irq;
2261
(res + r)->flags = IORESOURCE_IRQ;
2265
sdma_reqs_cnt = _count_sdma_reqs(oh);
2266
for (i = 0; i < sdma_reqs_cnt; i++) {
2267
(res + r)->name = (oh->sdma_reqs + i)->name;
2268
(res + r)->start = (oh->sdma_reqs + i)->dma_req;
2269
(res + r)->end = (oh->sdma_reqs + i)->dma_req;
2270
(res + r)->flags = IORESOURCE_DMA;
2274
for (i = 0; i < oh->slaves_cnt; i++) {
2275
struct omap_hwmod_ocp_if *os;
2279
addr_cnt = _count_ocp_if_addr_spaces(os);
2281
for (j = 0; j < addr_cnt; j++) {
2282
(res + r)->name = (os->addr + j)->name;
2283
(res + r)->start = (os->addr + j)->pa_start;
2284
(res + r)->end = (os->addr + j)->pa_end;
2285
(res + r)->flags = IORESOURCE_MEM;
2294
* omap_hwmod_get_pwrdm - return pointer to this module's main powerdomain
2295
* @oh: struct omap_hwmod *
2297
* Return the powerdomain pointer associated with the OMAP module
2298
* @oh's main clock. If @oh does not have a main clk, return the
2299
* powerdomain associated with the interface clock associated with the
2300
* module's MPU port. (XXX Perhaps this should use the SDMA port
2301
* instead?) Returns NULL on error, or a struct powerdomain * on
2304
struct powerdomain *omap_hwmod_get_pwrdm(struct omap_hwmod *oh)
2314
if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
2316
c = oh->slaves[oh->_mpu_port_index]->_clk;
2322
return c->clkdm->pwrdm.ptr;
2327
* omap_hwmod_get_mpu_rt_va - return the module's base address (for the MPU)
2328
* @oh: struct omap_hwmod *
2330
* Returns the virtual address corresponding to the beginning of the
2331
* module's register target, in the address range that is intended to
2332
* be used by the MPU. Returns the virtual address upon success or NULL
2335
void __iomem *omap_hwmod_get_mpu_rt_va(struct omap_hwmod *oh)
2340
if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
2343
if (oh->_state == _HWMOD_STATE_UNKNOWN)
2346
return oh->_mpu_rt_va;
2350
* omap_hwmod_add_initiator_dep - add sleepdep from @init_oh to @oh
2351
* @oh: struct omap_hwmod *
2352
* @init_oh: struct omap_hwmod * (initiator)
2354
* Add a sleep dependency between the initiator @init_oh and @oh.
2355
* Intended to be called by DSP/Bridge code via platform_data for the
2356
* DSP case; and by the DMA code in the sDMA case. DMA code, *Bridge
2357
* code needs to add/del initiator dependencies dynamically
2358
* before/after accessing a device. Returns the return value from
2359
* _add_initiator_dep().
2361
* XXX Keep a usecount in the clockdomain code
2363
int omap_hwmod_add_initiator_dep(struct omap_hwmod *oh,
2364
struct omap_hwmod *init_oh)
2366
return _add_initiator_dep(oh, init_oh);
2370
* XXX what about functions for drivers to save/restore ocp_sysconfig
2371
* for context save/restore operations?
2375
* omap_hwmod_del_initiator_dep - remove sleepdep from @init_oh to @oh
2376
* @oh: struct omap_hwmod *
2377
* @init_oh: struct omap_hwmod * (initiator)
2379
* Remove a sleep dependency between the initiator @init_oh and @oh.
2380
* Intended to be called by DSP/Bridge code via platform_data for the
2381
* DSP case; and by the DMA code in the sDMA case. DMA code, *Bridge
2382
* code needs to add/del initiator dependencies dynamically
2383
* before/after accessing a device. Returns the return value from
2384
* _del_initiator_dep().
2386
* XXX Keep a usecount in the clockdomain code
2388
int omap_hwmod_del_initiator_dep(struct omap_hwmod *oh,
2389
struct omap_hwmod *init_oh)
2391
return _del_initiator_dep(oh, init_oh);
2395
* omap_hwmod_enable_wakeup - allow device to wake up the system
2396
* @oh: struct omap_hwmod *
2398
* Sets the module OCP socket ENAWAKEUP bit to allow the module to
2399
* send wakeups to the PRCM. Eventually this should sets PRCM wakeup
2400
* registers to cause the PRCM to receive wakeup events from the
2401
* module. Does not set any wakeup routing registers beyond this
2402
* point - if the module is to wake up any other module or subsystem,
2403
* that must be set separately. Called by omap_device code. Returns
2404
* -EINVAL on error or 0 upon success.
2406
int omap_hwmod_enable_wakeup(struct omap_hwmod *oh)
2408
unsigned long flags;
2411
if (!oh->class->sysc ||
2412
!(oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP))
2415
spin_lock_irqsave(&oh->_lock, flags);
2416
v = oh->_sysc_cache;
2417
_enable_wakeup(oh, &v);
2418
_write_sysconfig(v, oh);
2419
spin_unlock_irqrestore(&oh->_lock, flags);
2425
* omap_hwmod_disable_wakeup - prevent device from waking the system
2426
* @oh: struct omap_hwmod *
2428
* Clears the module OCP socket ENAWAKEUP bit to prevent the module
2429
* from sending wakeups to the PRCM. Eventually this should clear
2430
* PRCM wakeup registers to cause the PRCM to ignore wakeup events
2431
* from the module. Does not set any wakeup routing registers beyond
2432
* this point - if the module is to wake up any other module or
2433
* subsystem, that must be set separately. Called by omap_device
2434
* code. Returns -EINVAL on error or 0 upon success.
2436
int omap_hwmod_disable_wakeup(struct omap_hwmod *oh)
2438
unsigned long flags;
2441
if (!oh->class->sysc ||
2442
!(oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP))
2445
spin_lock_irqsave(&oh->_lock, flags);
2446
v = oh->_sysc_cache;
2447
_disable_wakeup(oh, &v);
2448
_write_sysconfig(v, oh);
2449
spin_unlock_irqrestore(&oh->_lock, flags);
2455
* omap_hwmod_assert_hardreset - assert the HW reset line of submodules
2456
* contained in the hwmod module.
2457
* @oh: struct omap_hwmod *
2458
* @name: name of the reset line to lookup and assert
2460
* Some IP like dsp, ipu or iva contain processor that require
2461
* an HW reset line to be assert / deassert in order to enable fully
2462
* the IP. Returns -EINVAL if @oh is null or if the operation is not
2463
* yet supported on this OMAP; otherwise, passes along the return value
2464
* from _assert_hardreset().
2466
int omap_hwmod_assert_hardreset(struct omap_hwmod *oh, const char *name)
2469
unsigned long flags;
2474
spin_lock_irqsave(&oh->_lock, flags);
2475
ret = _assert_hardreset(oh, name);
2476
spin_unlock_irqrestore(&oh->_lock, flags);
2482
* omap_hwmod_deassert_hardreset - deassert the HW reset line of submodules
2483
* contained in the hwmod module.
2484
* @oh: struct omap_hwmod *
2485
* @name: name of the reset line to look up and deassert
2487
* Some IP like dsp, ipu or iva contain processor that require
2488
* an HW reset line to be assert / deassert in order to enable fully
2489
* the IP. Returns -EINVAL if @oh is null or if the operation is not
2490
* yet supported on this OMAP; otherwise, passes along the return value
2491
* from _deassert_hardreset().
2493
int omap_hwmod_deassert_hardreset(struct omap_hwmod *oh, const char *name)
2496
unsigned long flags;
2501
spin_lock_irqsave(&oh->_lock, flags);
2502
ret = _deassert_hardreset(oh, name);
2503
spin_unlock_irqrestore(&oh->_lock, flags);
2509
* omap_hwmod_read_hardreset - read the HW reset line state of submodules
2510
* contained in the hwmod module
2511
* @oh: struct omap_hwmod *
2512
* @name: name of the reset line to look up and read
2514
* Return the current state of the hwmod @oh's reset line named @name:
2515
* returns -EINVAL upon parameter error or if this operation
2516
* is unsupported on the current OMAP; otherwise, passes along the return
2517
* value from _read_hardreset().
2519
int omap_hwmod_read_hardreset(struct omap_hwmod *oh, const char *name)
2522
unsigned long flags;
2527
spin_lock_irqsave(&oh->_lock, flags);
2528
ret = _read_hardreset(oh, name);
2529
spin_unlock_irqrestore(&oh->_lock, flags);
2536
* omap_hwmod_for_each_by_class - call @fn for each hwmod of class @classname
2537
* @classname: struct omap_hwmod_class name to search for
2538
* @fn: callback function pointer to call for each hwmod in class @classname
2539
* @user: arbitrary context data to pass to the callback function
2541
* For each omap_hwmod of class @classname, call @fn.
2542
* If the callback function returns something other than
2543
* zero, the iterator is terminated, and the callback function's return
2544
* value is passed back to the caller. Returns 0 upon success, -EINVAL
2545
* if @classname or @fn are NULL, or passes back the error code from @fn.
2547
int omap_hwmod_for_each_by_class(const char *classname,
2548
int (*fn)(struct omap_hwmod *oh,
2552
struct omap_hwmod *temp_oh;
2555
if (!classname || !fn)
2558
pr_debug("omap_hwmod: %s: looking for modules of class %s\n",
2559
__func__, classname);
2561
list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
2562
if (!strcmp(temp_oh->class->name, classname)) {
2563
pr_debug("omap_hwmod: %s: %s: calling callback fn\n",
2564
__func__, temp_oh->name);
2565
ret = (*fn)(temp_oh, user);
2572
pr_debug("omap_hwmod: %s: iterator terminated early: %d\n",
2579
* omap_hwmod_set_postsetup_state - set the post-_setup() state for this hwmod
2580
* @oh: struct omap_hwmod *
2581
* @state: state that _setup() should leave the hwmod in
2583
* Sets the hwmod state that @oh will enter at the end of _setup()
2584
* (called by omap_hwmod_setup_*()). Only valid to call between
2585
* calling omap_hwmod_register() and omap_hwmod_setup_*(). Returns
2586
* 0 upon success or -EINVAL if there is a problem with the arguments
2587
* or if the hwmod is in the wrong state.
2589
int omap_hwmod_set_postsetup_state(struct omap_hwmod *oh, u8 state)
2592
unsigned long flags;
2597
if (state != _HWMOD_STATE_DISABLED &&
2598
state != _HWMOD_STATE_ENABLED &&
2599
state != _HWMOD_STATE_IDLE)
2602
spin_lock_irqsave(&oh->_lock, flags);
2604
if (oh->_state != _HWMOD_STATE_REGISTERED) {
2609
oh->_postsetup_state = state;
2613
spin_unlock_irqrestore(&oh->_lock, flags);
2619
* omap_hwmod_get_context_loss_count - get lost context count
2620
* @oh: struct omap_hwmod *
2622
* Query the powerdomain of of @oh to get the context loss
2623
* count for this device.
2625
* Returns the context loss count of the powerdomain assocated with @oh
2626
* upon success, or zero if no powerdomain exists for @oh.
2628
int omap_hwmod_get_context_loss_count(struct omap_hwmod *oh)
2630
struct powerdomain *pwrdm;
2633
pwrdm = omap_hwmod_get_pwrdm(oh);
2635
ret = pwrdm_get_context_loss_count(pwrdm);
2641
* omap_hwmod_no_setup_reset - prevent a hwmod from being reset upon setup
2642
* @oh: struct omap_hwmod *
2644
* Prevent the hwmod @oh from being reset during the setup process.
2645
* Intended for use by board-*.c files on boards with devices that
2646
* cannot tolerate being reset. Must be called before the hwmod has
2647
* been set up. Returns 0 upon success or negative error code upon
2650
int omap_hwmod_no_setup_reset(struct omap_hwmod *oh)
2655
if (oh->_state != _HWMOD_STATE_REGISTERED) {
2656
pr_err("omap_hwmod: %s: cannot prevent setup reset; in wrong state\n",
2661
oh->flags |= HWMOD_INIT_NO_RESET;