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authorAnton Arapov <anton@redhat.com>2012-04-16 10:05:28 +0200
committerAnton Arapov <anton@redhat.com>2012-04-16 10:05:28 +0200
commitb4b6116a13633898cf868f2f103c96a90c4c20f8 (patch)
tree93d1b7e2cfcdf473d8d4ff3ad141fa864f8491f6 /arch/arm/mach-omap2/omap_hwmod.c
parentedd4be777c953e5faafc80d091d3084b4343f5d3 (diff)
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fedora kernel: d9aad82f3319f3cfd1aebc01234254ef0c37ad84v3.3.2-1
Signed-off-by: Anton Arapov <anton@redhat.com>
Diffstat (limited to 'arch/arm/mach-omap2/omap_hwmod.c')
-rw-r--r--arch/arm/mach-omap2/omap_hwmod.c2787
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diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c
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+/*
+ * omap_hwmod implementation for OMAP2/3/4
+ *
+ * Copyright (C) 2009-2011 Nokia Corporation
+ * Copyright (C) 2011 Texas Instruments, Inc.
+ *
+ * Paul Walmsley, BenoƮt Cousson, Kevin Hilman
+ *
+ * Created in collaboration with (alphabetical order): Thara Gopinath,
+ * Tony Lindgren, Rajendra Nayak, Vikram Pandita, Sakari Poussa, Anand
+ * Sawant, Santosh Shilimkar, Richard Woodruff
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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)
+ * - OMAP4430 Multimedia Device Silicon Revision 1.0 (SWPU140)
+ * - Open Core Protocol Specification 2.2
+ *
+ * To do:
+ * - handle IO mapping
+ * - bus throughput & module latency measurement code
+ *
+ * XXX add tests at the beginning of each function to ensure the hwmod is
+ * in the appropriate state
+ * XXX error return values should be checked to ensure that they are
+ * appropriate
+ */
+#undef DEBUG
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/list.h>
+#include <linux/mutex.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+
+#include "common.h"
+#include <plat/cpu.h>
+#include "clockdomain.h"
+#include "powerdomain.h"
+#include <plat/clock.h>
+#include <plat/omap_hwmod.h>
+#include <plat/prcm.h>
+
+#include "cm2xxx_3xxx.h"
+#include "cminst44xx.h"
+#include "prm2xxx_3xxx.h"
+#include "prm44xx.h"
+#include "prminst44xx.h"
+#include "mux.h"
+
+/* Maximum microseconds to wait for OMAP module to softreset */
+#define MAX_MODULE_SOFTRESET_WAIT 10000
+
+/* Name of the OMAP hwmod for the MPU */
+#define MPU_INITIATOR_NAME "mpu"
+
+/* omap_hwmod_list contains all registered struct omap_hwmods */
+static LIST_HEAD(omap_hwmod_list);
+
+/* mpu_oh: used to add/remove MPU initiator from sleepdep list */
+static struct omap_hwmod *mpu_oh;
+
+
+/* Private functions */
+
+/**
+ * _update_sysc_cache - return the module OCP_SYSCONFIG register, keep copy
+ * @oh: struct omap_hwmod *
+ *
+ * Load the current value of the hwmod OCP_SYSCONFIG register into the
+ * struct omap_hwmod for later use. Returns -EINVAL if the hwmod has no
+ * OCP_SYSCONFIG register or 0 upon success.
+ */
+static int _update_sysc_cache(struct omap_hwmod *oh)
+{
+ if (!oh->class->sysc) {
+ WARN(1, "omap_hwmod: %s: cannot read OCP_SYSCONFIG: not defined on hwmod's class\n", oh->name);
+ return -EINVAL;
+ }
+
+ /* XXX ensure module interface clock is up */
+
+ oh->_sysc_cache = omap_hwmod_read(oh, oh->class->sysc->sysc_offs);
+
+ if (!(oh->class->sysc->sysc_flags & SYSC_NO_CACHE))
+ oh->_int_flags |= _HWMOD_SYSCONFIG_LOADED;
+
+ return 0;
+}
+
+/**
+ * _write_sysconfig - write a value to the module's OCP_SYSCONFIG register
+ * @v: OCP_SYSCONFIG value to write
+ * @oh: struct omap_hwmod *
+ *
+ * Write @v into the module class' OCP_SYSCONFIG register, if it has
+ * one. No return value.
+ */
+static void _write_sysconfig(u32 v, struct omap_hwmod *oh)
+{
+ if (!oh->class->sysc) {
+ WARN(1, "omap_hwmod: %s: cannot write OCP_SYSCONFIG: not defined on hwmod's class\n", oh->name);
+ return;
+ }
+
+ /* XXX ensure module interface clock is up */
+
+ /* Module might have lost context, always update cache and register */
+ oh->_sysc_cache = v;
+ omap_hwmod_write(v, oh, oh->class->sysc->sysc_offs);
+}
+
+/**
+ * _set_master_standbymode: set the OCP_SYSCONFIG MIDLEMODE field in @v
+ * @oh: struct omap_hwmod *
+ * @standbymode: MIDLEMODE field bits
+ * @v: pointer to register contents to modify
+ *
+ * Update the master standby mode bits in @v to be @standbymode for
+ * the @oh hwmod. Does not write to the hardware. Returns -EINVAL
+ * upon error or 0 upon success.
+ */
+static int _set_master_standbymode(struct omap_hwmod *oh, u8 standbymode,
+ u32 *v)
+{
+ u32 mstandby_mask;
+ u8 mstandby_shift;
+
+ if (!oh->class->sysc ||
+ !(oh->class->sysc->sysc_flags & SYSC_HAS_MIDLEMODE))
+ return -EINVAL;
+
+ if (!oh->class->sysc->sysc_fields) {
+ WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
+ return -EINVAL;
+ }
+
+ mstandby_shift = oh->class->sysc->sysc_fields->midle_shift;
+ mstandby_mask = (0x3 << mstandby_shift);
+
+ *v &= ~mstandby_mask;
+ *v |= __ffs(standbymode) << mstandby_shift;
+
+ return 0;
+}
+
+/**
+ * _set_slave_idlemode: set the OCP_SYSCONFIG SIDLEMODE field in @v
+ * @oh: struct omap_hwmod *
+ * @idlemode: SIDLEMODE field bits
+ * @v: pointer to register contents to modify
+ *
+ * Update the slave idle mode bits in @v to be @idlemode for the @oh
+ * hwmod. Does not write to the hardware. Returns -EINVAL upon error
+ * or 0 upon success.
+ */
+static int _set_slave_idlemode(struct omap_hwmod *oh, u8 idlemode, u32 *v)
+{
+ u32 sidle_mask;
+ u8 sidle_shift;
+
+ if (!oh->class->sysc ||
+ !(oh->class->sysc->sysc_flags & SYSC_HAS_SIDLEMODE))
+ return -EINVAL;
+
+ if (!oh->class->sysc->sysc_fields) {
+ WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
+ return -EINVAL;
+ }
+
+ sidle_shift = oh->class->sysc->sysc_fields->sidle_shift;
+ sidle_mask = (0x3 << sidle_shift);
+
+ *v &= ~sidle_mask;
+ *v |= __ffs(idlemode) << sidle_shift;
+
+ return 0;
+}
+
+/**
+ * _set_clockactivity: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v
+ * @oh: struct omap_hwmod *
+ * @clockact: CLOCKACTIVITY field bits
+ * @v: pointer to register contents to modify
+ *
+ * Update the clockactivity mode bits in @v to be @clockact for the
+ * @oh hwmod. Used for additional powersaving on some modules. Does
+ * not write to the hardware. Returns -EINVAL upon error or 0 upon
+ * success.
+ */
+static int _set_clockactivity(struct omap_hwmod *oh, u8 clockact, u32 *v)
+{
+ u32 clkact_mask;
+ u8 clkact_shift;
+
+ if (!oh->class->sysc ||
+ !(oh->class->sysc->sysc_flags & SYSC_HAS_CLOCKACTIVITY))
+ return -EINVAL;
+
+ if (!oh->class->sysc->sysc_fields) {
+ WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
+ return -EINVAL;
+ }
+
+ clkact_shift = oh->class->sysc->sysc_fields->clkact_shift;
+ clkact_mask = (0x3 << clkact_shift);
+
+ *v &= ~clkact_mask;
+ *v |= clockact << clkact_shift;
+
+ return 0;
+}
+
+/**
+ * _set_softreset: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v
+ * @oh: struct omap_hwmod *
+ * @v: pointer to register contents to modify
+ *
+ * Set the SOFTRESET bit in @v for hwmod @oh. Returns -EINVAL upon
+ * error or 0 upon success.
+ */
+static int _set_softreset(struct omap_hwmod *oh, u32 *v)
+{
+ u32 softrst_mask;
+
+ if (!oh->class->sysc ||
+ !(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET))
+ return -EINVAL;
+
+ if (!oh->class->sysc->sysc_fields) {
+ WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
+ return -EINVAL;
+ }
+
+ softrst_mask = (0x1 << oh->class->sysc->sysc_fields->srst_shift);
+
+ *v |= softrst_mask;
+
+ return 0;
+}
+
+/**
+ * _set_module_autoidle: set the OCP_SYSCONFIG AUTOIDLE field in @v
+ * @oh: struct omap_hwmod *
+ * @autoidle: desired AUTOIDLE bitfield value (0 or 1)
+ * @v: pointer to register contents to modify
+ *
+ * Update the module autoidle bit in @v to be @autoidle for the @oh
+ * hwmod. The autoidle bit controls whether the module can gate
+ * internal clocks automatically when it isn't doing anything; the
+ * exact function of this bit varies on a per-module basis. This
+ * function does not write to the hardware. Returns -EINVAL upon
+ * error or 0 upon success.
+ */
+static int _set_module_autoidle(struct omap_hwmod *oh, u8 autoidle,
+ u32 *v)
+{
+ u32 autoidle_mask;
+ u8 autoidle_shift;
+
+ if (!oh->class->sysc ||
+ !(oh->class->sysc->sysc_flags & SYSC_HAS_AUTOIDLE))
+ return -EINVAL;
+
+ if (!oh->class->sysc->sysc_fields) {
+ WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
+ return -EINVAL;
+ }
+
+ autoidle_shift = oh->class->sysc->sysc_fields->autoidle_shift;
+ autoidle_mask = (0x1 << autoidle_shift);
+
+ *v &= ~autoidle_mask;
+ *v |= autoidle << autoidle_shift;
+
+ return 0;
+}
+
+/**
+ * _set_idle_ioring_wakeup - enable/disable IO pad wakeup on hwmod idle for mux
+ * @oh: struct omap_hwmod *
+ * @set_wake: bool value indicating to set (true) or clear (false) wakeup enable
+ *
+ * Set or clear the I/O pad wakeup flag in the mux entries for the
+ * hwmod @oh. This function changes the @oh->mux->pads_dynamic array
+ * in memory. If the hwmod is currently idled, and the new idle
+ * values don't match the previous ones, this function will also
+ * update the SCM PADCTRL registers. Otherwise, if the hwmod is not
+ * currently idled, this function won't touch the hardware: the new
+ * mux settings are written to the SCM PADCTRL registers when the
+ * hwmod is idled. No return value.
+ */
+static void _set_idle_ioring_wakeup(struct omap_hwmod *oh, bool set_wake)
+{
+ struct omap_device_pad *pad;
+ bool change = false;
+ u16 prev_idle;
+ int j;
+
+ if (!oh->mux || !oh->mux->enabled)
+ return;
+
+ for (j = 0; j < oh->mux->nr_pads_dynamic; j++) {
+ pad = oh->mux->pads_dynamic[j];
+
+ if (!(pad->flags & OMAP_DEVICE_PAD_WAKEUP))
+ continue;
+
+ prev_idle = pad->idle;
+
+ if (set_wake)
+ pad->idle |= OMAP_WAKEUP_EN;
+ else
+ pad->idle &= ~OMAP_WAKEUP_EN;
+
+ if (prev_idle != pad->idle)
+ change = true;
+ }
+
+ if (change && oh->_state == _HWMOD_STATE_IDLE)
+ omap_hwmod_mux(oh->mux, _HWMOD_STATE_IDLE);
+}
+
+/**
+ * _enable_wakeup: set OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
+ * @oh: struct omap_hwmod *
+ *
+ * Allow the hardware module @oh to send wakeups. Returns -EINVAL
+ * upon error or 0 upon success.
+ */
+static int _enable_wakeup(struct omap_hwmod *oh, u32 *v)
+{
+ if (!oh->class->sysc ||
+ !((oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP) ||
+ (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP) ||
+ (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)))
+ return -EINVAL;
+
+ if (!oh->class->sysc->sysc_fields) {
+ WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
+ return -EINVAL;
+ }
+
+ if (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)
+ *v |= 0x1 << oh->class->sysc->sysc_fields->enwkup_shift;
+
+ if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP)
+ _set_slave_idlemode(oh, HWMOD_IDLEMODE_SMART_WKUP, v);
+ if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
+ _set_master_standbymode(oh, HWMOD_IDLEMODE_SMART_WKUP, v);
+
+ /* XXX test pwrdm_get_wken for this hwmod's subsystem */
+
+ oh->_int_flags |= _HWMOD_WAKEUP_ENABLED;
+
+ return 0;
+}
+
+/**
+ * _disable_wakeup: clear OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
+ * @oh: struct omap_hwmod *
+ *
+ * Prevent the hardware module @oh to send wakeups. Returns -EINVAL
+ * upon error or 0 upon success.
+ */
+static int _disable_wakeup(struct omap_hwmod *oh, u32 *v)
+{
+ if (!oh->class->sysc ||
+ !((oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP) ||
+ (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP) ||
+ (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)))
+ return -EINVAL;
+
+ if (!oh->class->sysc->sysc_fields) {
+ WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
+ return -EINVAL;
+ }
+
+ if (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)
+ *v &= ~(0x1 << oh->class->sysc->sysc_fields->enwkup_shift);
+
+ if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP)
+ _set_slave_idlemode(oh, HWMOD_IDLEMODE_SMART, v);
+ if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
+ _set_master_standbymode(oh, HWMOD_IDLEMODE_SMART_WKUP, v);
+
+ /* XXX test pwrdm_get_wken for this hwmod's subsystem */
+
+ oh->_int_flags &= ~_HWMOD_WAKEUP_ENABLED;
+
+ return 0;
+}
+
+/**
+ * _add_initiator_dep: prevent @oh from smart-idling while @init_oh is active
+ * @oh: struct omap_hwmod *
+ *
+ * Prevent the hardware module @oh from entering idle while the
+ * hardare module initiator @init_oh is active. Useful when a module
+ * will be accessed by a particular initiator (e.g., if a module will
+ * be accessed by the IVA, there should be a sleepdep between the IVA
+ * initiator and the module). Only applies to modules in smart-idle
+ * mode. If the clockdomain is marked as not needing autodeps, return
+ * 0 without doing anything. Otherwise, returns -EINVAL upon error or
+ * passes along clkdm_add_sleepdep() value upon success.
+ */
+static int _add_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh)
+{
+ if (!oh->_clk)
+ return -EINVAL;
+
+ if (oh->_clk->clkdm && oh->_clk->clkdm->flags & CLKDM_NO_AUTODEPS)
+ return 0;
+
+ return clkdm_add_sleepdep(oh->_clk->clkdm, init_oh->_clk->clkdm);
+}
+
+/**
+ * _del_initiator_dep: allow @oh to smart-idle even if @init_oh is active
+ * @oh: struct omap_hwmod *
+ *
+ * Allow the hardware module @oh to enter idle while the hardare
+ * module initiator @init_oh is active. Useful when a module will not
+ * be accessed by a particular initiator (e.g., if a module will not
+ * be accessed by the IVA, there should be no sleepdep between the IVA
+ * initiator and the module). Only applies to modules in smart-idle
+ * mode. If the clockdomain is marked as not needing autodeps, return
+ * 0 without doing anything. Returns -EINVAL upon error or passes
+ * along clkdm_del_sleepdep() value upon success.
+ */
+static int _del_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh)
+{
+ if (!oh->_clk)
+ return -EINVAL;
+
+ if (oh->_clk->clkdm && oh->_clk->clkdm->flags & CLKDM_NO_AUTODEPS)
+ return 0;
+
+ return clkdm_del_sleepdep(oh->_clk->clkdm, init_oh->_clk->clkdm);
+}
+
+/**
+ * _init_main_clk - get a struct clk * for the the hwmod's main functional clk
+ * @oh: struct omap_hwmod *
+ *
+ * Called from _init_clocks(). Populates the @oh _clk (main
+ * functional clock pointer) if a main_clk is present. Returns 0 on
+ * success or -EINVAL on error.
+ */
+static int _init_main_clk(struct omap_hwmod *oh)
+{
+ int ret = 0;
+
+ if (!oh->main_clk)
+ return 0;
+
+ oh->_clk = omap_clk_get_by_name(oh->main_clk);
+ if (!oh->_clk) {
+ pr_warning("omap_hwmod: %s: cannot clk_get main_clk %s\n",
+ oh->name, oh->main_clk);
+ return -EINVAL;
+ }
+
+ if (!oh->_clk->clkdm)
+ pr_warning("omap_hwmod: %s: missing clockdomain for %s.\n",
+ oh->main_clk, oh->_clk->name);
+
+ return ret;
+}
+
+/**
+ * _init_interface_clks - get a struct clk * for the the hwmod's interface clks
+ * @oh: struct omap_hwmod *
+ *
+ * Called from _init_clocks(). Populates the @oh OCP slave interface
+ * clock pointers. Returns 0 on success or -EINVAL on error.
+ */
+static int _init_interface_clks(struct omap_hwmod *oh)
+{
+ struct clk *c;
+ int i;
+ int ret = 0;
+
+ if (oh->slaves_cnt == 0)
+ return 0;
+
+ for (i = 0; i < oh->slaves_cnt; i++) {
+ struct omap_hwmod_ocp_if *os = oh->slaves[i];
+
+ if (!os->clk)
+ continue;
+
+ c = omap_clk_get_by_name(os->clk);
+ if (!c) {
+ pr_warning("omap_hwmod: %s: cannot clk_get interface_clk %s\n",
+ oh->name, os->clk);
+ ret = -EINVAL;
+ }
+ os->_clk = c;
+ }
+
+ return ret;
+}
+
+/**
+ * _init_opt_clk - get a struct clk * for the the hwmod's optional clocks
+ * @oh: struct omap_hwmod *
+ *
+ * Called from _init_clocks(). Populates the @oh omap_hwmod_opt_clk
+ * clock pointers. Returns 0 on success or -EINVAL on error.
+ */
+static int _init_opt_clks(struct omap_hwmod *oh)
+{
+ struct omap_hwmod_opt_clk *oc;
+ struct clk *c;
+ int i;
+ int ret = 0;
+
+ for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++) {
+ c = omap_clk_get_by_name(oc->clk);
+ if (!c) {
+ pr_warning("omap_hwmod: %s: cannot clk_get opt_clk %s\n",
+ oh->name, oc->clk);
+ ret = -EINVAL;
+ }
+ oc->_clk = c;
+ }
+
+ return ret;
+}
+
+/**
+ * _enable_clocks - enable hwmod main clock and interface clocks
+ * @oh: struct omap_hwmod *
+ *
+ * Enables all clocks necessary for register reads and writes to succeed
+ * on the hwmod @oh. Returns 0.
+ */
+static int _enable_clocks(struct omap_hwmod *oh)
+{
+ int i;
+
+ pr_debug("omap_hwmod: %s: enabling clocks\n", oh->name);
+
+ if (oh->_clk)
+ clk_enable(oh->_clk);
+
+ if (oh->slaves_cnt > 0) {
+ for (i = 0; i < oh->slaves_cnt; i++) {
+ struct omap_hwmod_ocp_if *os = oh->slaves[i];
+ struct clk *c = os->_clk;
+
+ if (c && (os->flags & OCPIF_SWSUP_IDLE))
+ clk_enable(c);
+ }
+ }
+
+ /* The opt clocks are controlled by the device driver. */
+
+ return 0;
+}
+
+/**
+ * _disable_clocks - disable hwmod main clock and interface clocks
+ * @oh: struct omap_hwmod *
+ *
+ * Disables the hwmod @oh main functional and interface clocks. Returns 0.
+ */
+static int _disable_clocks(struct omap_hwmod *oh)
+{
+ int i;
+
+ pr_debug("omap_hwmod: %s: disabling clocks\n", oh->name);
+
+ if (oh->_clk)
+ clk_disable(oh->_clk);
+
+ if (oh->slaves_cnt > 0) {
+ for (i = 0; i < oh->slaves_cnt; i++) {
+ struct omap_hwmod_ocp_if *os = oh->slaves[i];
+ struct clk *c = os->_clk;
+
+ if (c && (os->flags & OCPIF_SWSUP_IDLE))
+ clk_disable(c);
+ }
+ }
+
+ /* The opt clocks are controlled by the device driver. */
+
+ return 0;
+}
+
+static void _enable_optional_clocks(struct omap_hwmod *oh)
+{
+ struct omap_hwmod_opt_clk *oc;
+ int i;
+
+ pr_debug("omap_hwmod: %s: enabling optional clocks\n", oh->name);
+
+ for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
+ if (oc->_clk) {
+ pr_debug("omap_hwmod: enable %s:%s\n", oc->role,
+ oc->_clk->name);
+ clk_enable(oc->_clk);
+ }
+}
+
+static void _disable_optional_clocks(struct omap_hwmod *oh)
+{
+ struct omap_hwmod_opt_clk *oc;
+ int i;
+
+ pr_debug("omap_hwmod: %s: disabling optional clocks\n", oh->name);
+
+ for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
+ if (oc->_clk) {
+ pr_debug("omap_hwmod: disable %s:%s\n", oc->role,
+ oc->_clk->name);
+ clk_disable(oc->_clk);
+ }
+}
+
+/**
+ * _enable_module - enable CLKCTRL modulemode on OMAP4
+ * @oh: struct omap_hwmod *
+ *
+ * Enables the PRCM module mode related to the hwmod @oh.
+ * No return value.
+ */
+static void _enable_module(struct omap_hwmod *oh)
+{
+ /* The module mode does not exist prior OMAP4 */
+ if (cpu_is_omap24xx() || cpu_is_omap34xx())
+ return;
+
+ if (!oh->clkdm || !oh->prcm.omap4.modulemode)
+ return;
+
+ pr_debug("omap_hwmod: %s: _enable_module: %d\n",
+ oh->name, oh->prcm.omap4.modulemode);
+
+ omap4_cminst_module_enable(oh->prcm.omap4.modulemode,
+ oh->clkdm->prcm_partition,
+ oh->clkdm->cm_inst,
+ oh->clkdm->clkdm_offs,
+ oh->prcm.omap4.clkctrl_offs);
+}
+
+/**
+ * _omap4_wait_target_disable - wait for a module to be disabled on OMAP4
+ * @oh: struct omap_hwmod *
+ *
+ * Wait for a module @oh to enter slave idle. Returns 0 if the module
+ * does not have an IDLEST bit or if the module successfully enters
+ * slave idle; otherwise, pass along the return value of the
+ * appropriate *_cm*_wait_module_idle() function.
+ */
+static int _omap4_wait_target_disable(struct omap_hwmod *oh)
+{
+ if (!cpu_is_omap44xx())
+ return 0;
+
+ if (!oh)
+ return -EINVAL;
+
+ if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
+ return 0;
+
+ if (oh->flags & HWMOD_NO_IDLEST)
+ return 0;
+
+ return omap4_cminst_wait_module_idle(oh->clkdm->prcm_partition,
+ oh->clkdm->cm_inst,
+ oh->clkdm->clkdm_offs,
+ oh->prcm.omap4.clkctrl_offs);
+}
+
+/**
+ * _omap4_disable_module - enable CLKCTRL modulemode on OMAP4
+ * @oh: struct omap_hwmod *
+ *
+ * Disable the PRCM module mode related to the hwmod @oh.
+ * Return EINVAL if the modulemode is not supported and 0 in case of success.
+ */
+static int _omap4_disable_module(struct omap_hwmod *oh)
+{
+ int v;
+
+ /* The module mode does not exist prior OMAP4 */
+ if (!cpu_is_omap44xx())
+ return -EINVAL;
+
+ if (!oh->clkdm || !oh->prcm.omap4.modulemode)
+ return -EINVAL;
+
+ pr_debug("omap_hwmod: %s: %s\n", oh->name, __func__);
+
+ omap4_cminst_module_disable(oh->clkdm->prcm_partition,
+ oh->clkdm->cm_inst,
+ oh->clkdm->clkdm_offs,
+ oh->prcm.omap4.clkctrl_offs);
+
+ v = _omap4_wait_target_disable(oh);
+ if (v)
+ pr_warn("omap_hwmod: %s: _wait_target_disable failed\n",
+ oh->name);
+
+ return 0;
+}
+
+/**
+ * _count_mpu_irqs - count the number of MPU IRQ lines associated with @oh
+ * @oh: struct omap_hwmod *oh
+ *
+ * Count and return the number of MPU IRQs associated with the hwmod
+ * @oh. Used to allocate struct resource data. Returns 0 if @oh is
+ * NULL.
+ */
+static int _count_mpu_irqs(struct omap_hwmod *oh)
+{
+ struct omap_hwmod_irq_info *ohii;
+ int i = 0;
+
+ if (!oh || !oh->mpu_irqs)
+ return 0;
+
+ do {
+ ohii = &oh->mpu_irqs[i++];
+ } while (ohii->irq != -1);
+
+ return i-1;
+}
+
+/**
+ * _count_sdma_reqs - count the number of SDMA request lines associated with @oh
+ * @oh: struct omap_hwmod *oh
+ *
+ * Count and return the number of SDMA request lines associated with
+ * the hwmod @oh. Used to allocate struct resource data. Returns 0
+ * if @oh is NULL.
+ */
+static int _count_sdma_reqs(struct omap_hwmod *oh)
+{
+ struct omap_hwmod_dma_info *ohdi;
+ int i = 0;
+
+ if (!oh || !oh->sdma_reqs)
+ return 0;
+
+ do {
+ ohdi = &oh->sdma_reqs[i++];
+ } while (ohdi->dma_req != -1);
+
+ return i-1;
+}
+
+/**
+ * _count_ocp_if_addr_spaces - count the number of address space entries for @oh
+ * @oh: struct omap_hwmod *oh
+ *
+ * Count and return the number of address space ranges associated with
+ * the hwmod @oh. Used to allocate struct resource data. Returns 0
+ * if @oh is NULL.
+ */
+static int _count_ocp_if_addr_spaces(struct omap_hwmod_ocp_if *os)
+{
+ struct omap_hwmod_addr_space *mem;
+ int i = 0;
+
+ if (!os || !os->addr)
+ return 0;
+
+ do {
+ mem = &os->addr[i++];
+ } while (mem->pa_start != mem->pa_end);
+
+ return i-1;
+}
+
+/**
+ * _find_mpu_port_index - find hwmod OCP slave port ID intended for MPU use
+ * @oh: struct omap_hwmod *
+ *
+ * Returns the array index of the OCP slave port that the MPU
+ * addresses the device on, or -EINVAL upon error or not found.
+ */
+static int __init _find_mpu_port_index(struct omap_hwmod *oh)
+{
+ int i;
+ int found = 0;
+
+ if (!oh || oh->slaves_cnt == 0)
+ return -EINVAL;
+
+ for (i = 0; i < oh->slaves_cnt; i++) {
+ struct omap_hwmod_ocp_if *os = oh->slaves[i];
+
+ if (os->user & OCP_USER_MPU) {
+ found = 1;
+ break;
+ }
+ }
+
+ if (found)
+ pr_debug("omap_hwmod: %s: MPU OCP slave port ID %d\n",
+ oh->name, i);
+ else
+ pr_debug("omap_hwmod: %s: no MPU OCP slave port found\n",
+ oh->name);
+
+ return (found) ? i : -EINVAL;
+}
+
+/**
+ * _find_mpu_rt_base - find hwmod register target base addr accessible by MPU
+ * @oh: struct omap_hwmod *
+ *
+ * Return the virtual address of the base of the register target of
+ * device @oh, or NULL on error.
+ */
+static void __iomem * __init _find_mpu_rt_base(struct omap_hwmod *oh, u8 index)
+{
+ struct omap_hwmod_ocp_if *os;
+ struct omap_hwmod_addr_space *mem;
+ int i = 0, found = 0;
+ void __iomem *va_start;
+
+ if (!oh || oh->slaves_cnt == 0)
+ return NULL;
+
+ os = oh->slaves[index];
+
+ if (!os->addr)
+ return NULL;
+
+ do {
+ mem = &os->addr[i++];
+ if (mem->flags & ADDR_TYPE_RT)
+ found = 1;
+ } while (!found && mem->pa_start != mem->pa_end);
+
+ if (found) {
+ va_start = ioremap(mem->pa_start, mem->pa_end - mem->pa_start);
+ if (!va_start) {
+ pr_err("omap_hwmod: %s: Could not ioremap\n", oh->name);
+ return NULL;
+ }
+ pr_debug("omap_hwmod: %s: MPU register target at va %p\n",
+ oh->name, va_start);
+ } else {
+ pr_debug("omap_hwmod: %s: no MPU register target found\n",
+ oh->name);
+ }
+
+ return (found) ? va_start : NULL;
+}
+
+/**
+ * _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
+ * idle; otherwise, configure it for smart-idle. If module is marked
+ * as SWSUP_MSUSPEND, force the module out of master standby;
+ * otherwise, configure it for smart-standby. No return value.
+ */
+static void _enable_sysc(struct omap_hwmod *oh)
+{
+ u8 idlemode, sf;
+ u32 v;
+
+ if (!oh->class->sysc)
+ return;
+
+ v = oh->_sysc_cache;
+ sf = oh->class->sysc->sysc_flags;
+
+ if (sf & SYSC_HAS_SIDLEMODE) {
+ idlemode = (oh->flags & HWMOD_SWSUP_SIDLE) ?
+ HWMOD_IDLEMODE_NO : HWMOD_IDLEMODE_SMART;
+ _set_slave_idlemode(oh, idlemode, &v);
+ }
+
+ if (sf & SYSC_HAS_MIDLEMODE) {
+ if (oh->flags & HWMOD_SWSUP_MSTANDBY) {
+ idlemode = HWMOD_IDLEMODE_NO;
+ } else {
+ if (sf & SYSC_HAS_ENAWAKEUP)
+ _enable_wakeup(oh, &v);
+ if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
+ idlemode = HWMOD_IDLEMODE_SMART_WKUP;
+ else
+ idlemode = HWMOD_IDLEMODE_SMART;
+ }
+ _set_master_standbymode(oh, idlemode, &v);
+ }
+
+ /*
+ * XXX The clock framework should handle this, by
+ * calling into this code. But this must wait until the
+ * clock structures are tagged with omap_hwmod entries
+ */
+ if ((oh->flags & HWMOD_SET_DEFAULT_CLOCKACT) &&
+ (sf & SYSC_HAS_CLOCKACTIVITY))
+ _set_clockactivity(oh, oh->class->sysc->clockact, &v);
+
+ /* If slave is in SMARTIDLE, also enable wakeup */
+ if ((sf & SYSC_HAS_SIDLEMODE) && !(oh->flags & HWMOD_SWSUP_SIDLE))
+ _enable_wakeup(oh, &v);
+
+ _write_sysconfig(v, oh);
+
+ /*
+ * Set the autoidle bit only after setting the smartidle bit
+ * Setting this will not have any impact on the other modules.
+ */
+ if (sf & SYSC_HAS_AUTOIDLE) {
+ idlemode = (oh->flags & HWMOD_NO_OCP_AUTOIDLE) ?
+ 0 : 1;
+ _set_module_autoidle(oh, idlemode, &v);
+ _write_sysconfig(v, oh);
+ }
+}
+
+/**
+ * _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
+ * idle; otherwise, configure it for smart-idle. If module is marked
+ * as SWSUP_MSUSPEND, force the module into master standby; otherwise,
+ * configure it for smart-standby. No return value.
+ */
+static void _idle_sysc(struct omap_hwmod *oh)
+{
+ u8 idlemode, sf;
+ u32 v;
+
+ if (!oh->class->sysc)
+ return;
+
+ v = oh->_sysc_cache;
+ sf = oh->class->sysc->sysc_flags;
+
+ if (sf & SYSC_HAS_SIDLEMODE) {
+ idlemode = (oh->flags & HWMOD_SWSUP_SIDLE) ?
+ HWMOD_IDLEMODE_FORCE : HWMOD_IDLEMODE_SMART;
+ _set_slave_idlemode(oh, idlemode, &v);
+ }
+
+ if (sf & SYSC_HAS_MIDLEMODE) {
+ if (oh->flags & HWMOD_SWSUP_MSTANDBY) {
+ idlemode = HWMOD_IDLEMODE_FORCE;
+ } else {
+ if (sf & SYSC_HAS_ENAWAKEUP)
+ _enable_wakeup(oh, &v);
+ if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
+ idlemode = HWMOD_IDLEMODE_SMART_WKUP;
+ else
+ idlemode = HWMOD_IDLEMODE_SMART;
+ }
+ _set_master_standbymode(oh, idlemode, &v);
+ }
+
+ /* If slave is in SMARTIDLE, also enable wakeup */
+ if ((sf & SYSC_HAS_SIDLEMODE) && !(oh->flags & HWMOD_SWSUP_SIDLE))
+ _enable_wakeup(oh, &v);
+
+ _write_sysconfig(v, oh);
+}
+
+/**
+ * _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 _shutdown_sysc(struct omap_hwmod *oh)
+{
+ u32 v;
+ u8 sf;
+
+ if (!oh->class->sysc)
+ return;
+
+ v = oh->_sysc_cache;
+ sf = oh->class->sysc->sysc_flags;
+
+ if (sf & SYSC_HAS_SIDLEMODE)
+ _set_slave_idlemode(oh, HWMOD_IDLEMODE_FORCE, &v);
+
+ if (sf & SYSC_HAS_MIDLEMODE)
+ _set_master_standbymode(oh, HWMOD_IDLEMODE_FORCE, &v);
+
+ if (sf & SYSC_HAS_AUTOIDLE)
+ _set_module_autoidle(oh, 1, &v);
+
+ _write_sysconfig(v, oh);
+}
+
+/**
+ * _lookup - find an omap_hwmod by name
+ * @name: find an omap_hwmod by name
+ *
+ * Return a pointer to an omap_hwmod by name, or NULL if not found.
+ */
+static struct omap_hwmod *_lookup(const char *name)
+{
+ struct omap_hwmod *oh, *temp_oh;
+
+ oh = NULL;
+
+ list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
+ if (!strcmp(name, temp_oh->name)) {
+ oh = temp_oh;
+ break;
+ }
+ }
+
+ return oh;
+}
+/**
+ * _init_clkdm - look up a clockdomain name, store pointer in omap_hwmod
+ * @oh: struct omap_hwmod *
+ *
+ * Convert a clockdomain name stored in a struct omap_hwmod into a
+ * clockdomain pointer, and save it into the struct omap_hwmod.
+ * return -EINVAL if clkdm_name does not exist or if the lookup failed.
+ */
+static int _init_clkdm(struct omap_hwmod *oh)
+{
+ if (cpu_is_omap24xx() || cpu_is_omap34xx())
+ return 0;
+
+ if (!oh->clkdm_name) {
+ pr_warning("omap_hwmod: %s: no clkdm_name\n", oh->name);
+ return -EINVAL;
+ }
+
+ oh->clkdm = clkdm_lookup(oh->clkdm_name);
+ if (!oh->clkdm) {
+ pr_warning("omap_hwmod: %s: could not associate to clkdm %s\n",
+ oh->name, oh->clkdm_name);
+ return -EINVAL;
+ }
+
+ pr_debug("omap_hwmod: %s: associated to clkdm %s\n",
+ oh->name, oh->clkdm_name);
+
+ return 0;
+}
+
+/**
+ * _init_clocks - clk_get() all clocks associated with this hwmod. Retrieve as
+ * well the clockdomain.
+ * @oh: struct omap_hwmod *
+ * @data: not used; pass NULL
+ *
+ * Called by omap_hwmod_setup_*() (after omap2_clk_init()).
+ * Resolves all clock names embedded in the hwmod. Returns 0 on
+ * success, or a negative error code on failure.
+ */
+static int _init_clocks(struct omap_hwmod *oh, void *data)
+{
+ int ret = 0;
+
+ if (oh->_state != _HWMOD_STATE_REGISTERED)
+ return 0;
+
+ pr_debug("omap_hwmod: %s: looking up clocks\n", oh->name);
+
+ ret |= _init_main_clk(oh);
+ ret |= _init_interface_clks(oh);
+ ret |= _init_opt_clks(oh);
+ ret |= _init_clkdm(oh);
+
+ if (!ret)
+ oh->_state = _HWMOD_STATE_CLKS_INITED;
+ else
+ pr_warning("omap_hwmod: %s: cannot _init_clocks\n", oh->name);
+
+ return ret;
+}
+
+/**
+ * _wait_target_ready - wait for a module to leave slave idle
+ * @oh: struct omap_hwmod *
+ *
+ * Wait for a module @oh to leave slave idle. Returns 0 if the module
+ * does not have an IDLEST bit or if the module successfully leaves
+ * slave idle; otherwise, pass along the return value of the
+ * appropriate *_cm*_wait_module_ready() function.
+ */
+static int _wait_target_ready(struct omap_hwmod *oh)
+{
+ struct omap_hwmod_ocp_if *os;
+ int ret;
+
+ if (!oh)
+ return -EINVAL;
+
+ if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
+ return 0;
+
+ os = oh->slaves[oh->_mpu_port_index];
+
+ if (oh->flags & HWMOD_NO_IDLEST)
+ return 0;
+
+ /* XXX check module SIDLEMODE */
+
+ /* XXX check clock enable states */
+
+ if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
+ ret = omap2_cm_wait_module_ready(oh->prcm.omap2.module_offs,
+ oh->prcm.omap2.idlest_reg_id,
+ oh->prcm.omap2.idlest_idle_bit);
+ } else if (cpu_is_omap44xx()) {
+ if (!oh->clkdm)
+ return -EINVAL;
+
+ ret = omap4_cminst_wait_module_ready(oh->clkdm->prcm_partition,
+ oh->clkdm->cm_inst,
+ oh->clkdm->clkdm_offs,
+ oh->prcm.omap4.clkctrl_offs);
+ } else {
+ BUG();
+ };
+
+ return ret;
+}
+
+/**
+ * _lookup_hardreset - fill register bit info for this hwmod/reset line
+ * @oh: struct omap_hwmod *
+ * @name: name of the reset line in the context of this hwmod
+ * @ohri: struct omap_hwmod_rst_info * that this function will fill in
+ *
+ * Return the bit position of the reset line that match the
+ * input name. Return -ENOENT if not found.
+ */
+static u8 _lookup_hardreset(struct omap_hwmod *oh, const char *name,
+ struct omap_hwmod_rst_info *ohri)
+{
+ int i;
+
+ for (i = 0; i < oh->rst_lines_cnt; i++) {
+ const char *rst_line = oh->rst_lines[i].name;
+ if (!strcmp(rst_line, name)) {
+ ohri->rst_shift = oh->rst_lines[i].rst_shift;
+ ohri->st_shift = oh->rst_lines[i].st_shift;
+ pr_debug("omap_hwmod: %s: %s: %s: rst %d st %d\n",
+ oh->name, __func__, rst_line, ohri->rst_shift,
+ ohri->st_shift);
+
+ return 0;
+ }
+ }
+
+ return -ENOENT;
+}
+
+/**
+ * _assert_hardreset - assert the HW reset line of submodules
+ * contained in the hwmod module.
+ * @oh: struct omap_hwmod *
+ * @name: name of the reset line to lookup and assert
+ *
+ * Some IP like dsp, ipu or iva contain processor that require
+ * an HW reset line to be assert / deassert in order to enable fully
+ * the IP.
+ */
+static int _assert_hardreset(struct omap_hwmod *oh, const char *name)
+{
+ struct omap_hwmod_rst_info ohri;
+ u8 ret;
+
+ if (!oh)
+ return -EINVAL;
+
+ ret = _lookup_hardreset(oh, name, &ohri);
+ if (IS_ERR_VALUE(ret))
+ return ret;
+
+ if (cpu_is_omap24xx() || cpu_is_omap34xx())
+ return omap2_prm_assert_hardreset(oh->prcm.omap2.module_offs,
+ ohri.rst_shift);
+ else if (cpu_is_omap44xx())
+ return omap4_prminst_assert_hardreset(ohri.rst_shift,
+ oh->clkdm->pwrdm.ptr->prcm_partition,
+ oh->clkdm->pwrdm.ptr->prcm_offs,
+ oh->prcm.omap4.rstctrl_offs);
+ else
+ return -EINVAL;
+}
+
+/**
+ * _deassert_hardreset - deassert the HW reset line of submodules contained
+ * in the hwmod module.
+ * @oh: struct omap_hwmod *
+ * @name: name of the reset line to look up and deassert
+ *
+ * Some IP like dsp, ipu or iva contain processor that require
+ * an HW reset line to be assert / deassert in order to enable fully
+ * the IP.
+ */
+static int _deassert_hardreset(struct omap_hwmod *oh, const char *name)
+{
+ struct omap_hwmod_rst_info ohri;
+ int ret;
+
+ if (!oh)
+ return -EINVAL;
+
+ ret = _lookup_hardreset(oh, name, &ohri);
+ if (IS_ERR_VALUE(ret))
+ return ret;
+
+ if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
+ ret = omap2_prm_deassert_hardreset(oh->prcm.omap2.module_offs,
+ ohri.rst_shift,
+ ohri.st_shift);
+ } else if (cpu_is_omap44xx()) {
+ if (ohri.st_shift)
+ pr_err("omap_hwmod: %s: %s: hwmod data error: OMAP4 does not support st_shift\n",
+ oh->name, name);
+ ret = omap4_prminst_deassert_hardreset(ohri.rst_shift,
+ oh->clkdm->pwrdm.ptr->prcm_partition,
+ oh->clkdm->pwrdm.ptr->prcm_offs,
+ oh->prcm.omap4.rstctrl_offs);
+ } else {
+ return -EINVAL;
+ }
+
+ if (ret == -EBUSY)
+ pr_warning("omap_hwmod: %s: failed to hardreset\n", oh->name);
+
+ return ret;
+}
+
+/**
+ * _read_hardreset - read the HW reset line state of submodules
+ * contained in the hwmod module
+ * @oh: struct omap_hwmod *
+ * @name: name of the reset line to look up and read
+ *
+ * Return the state of the reset line.
+ */
+static int _read_hardreset(struct omap_hwmod *oh, const char *name)
+{
+ struct omap_hwmod_rst_info ohri;
+ u8 ret;
+
+ if (!oh)
+ return -EINVAL;
+
+ ret = _lookup_hardreset(oh, name, &ohri);
+ if (IS_ERR_VALUE(ret))
+ return ret;
+
+ if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
+ return omap2_prm_is_hardreset_asserted(oh->prcm.omap2.module_offs,
+ ohri.st_shift);
+ } else if (cpu_is_omap44xx()) {
+ return omap4_prminst_is_hardreset_asserted(ohri.rst_shift,
+ oh->clkdm->pwrdm.ptr->prcm_partition,
+ oh->clkdm->pwrdm.ptr->prcm_offs,
+ oh->prcm.omap4.rstctrl_offs);
+ } else {
+ return -EINVAL;
+ }
+}
+
+/**
+ * _ocp_softreset - reset an omap_hwmod via the OCP_SYSCONFIG bit
+ * @oh: struct omap_hwmod *
+ *
+ * Resets an omap_hwmod @oh via the OCP_SYSCONFIG bit. hwmod must be
+ * enabled for this to work. Returns -EINVAL if the hwmod cannot be
+ * reset this way or if the hwmod is in the wrong state, -ETIMEDOUT if
+ * the module did not reset in time, or 0 upon success.
+ *
+ * In OMAP3 a specific SYSSTATUS register is used to get the reset status.
+ * Starting in OMAP4, some IPs do not have SYSSTATUS registers and instead
+ * use the SYSCONFIG softreset bit to provide the status.
+ *
+ * Note that some IP like McBSP do have reset control but don't have
+ * reset status.
+ */
+static int _ocp_softreset(struct omap_hwmod *oh)
+{
+ u32 v;
+ int c = 0;
+ int ret = 0;
+
+ if (!oh->class->sysc ||
+ !(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET))
+ return -EINVAL;
+
+ /* clocks must be on for this operation */
+ if (oh->_state != _HWMOD_STATE_ENABLED) {
+ pr_warning("omap_hwmod: %s: reset can only be entered from "
+ "enabled state\n", oh->name);
+ return -EINVAL;
+ }
+
+ /* For some modules, all optionnal clocks need to be enabled as well */
+ if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
+ _enable_optional_clocks(oh);
+
+ pr_debug("omap_hwmod: %s: resetting via OCP SOFTRESET\n", oh->name);
+
+ v = oh->_sysc_cache;
+ ret = _set_softreset(oh, &v);
+ if (ret)
+ goto dis_opt_clks;
+ _write_sysconfig(v, oh);
+
+ if (oh->class->sysc->sysc_flags & SYSS_HAS_RESET_STATUS)
+ omap_test_timeout((omap_hwmod_read(oh,
+ oh->class->sysc->syss_offs)
+ & SYSS_RESETDONE_MASK),
+ MAX_MODULE_SOFTRESET_WAIT, c);
+ else if (oh->class->sysc->sysc_flags & SYSC_HAS_RESET_STATUS)
+ omap_test_timeout(!(omap_hwmod_read(oh,
+ oh->class->sysc->sysc_offs)
+ & SYSC_TYPE2_SOFTRESET_MASK),
+ MAX_MODULE_SOFTRESET_WAIT, c);
+
+ if (c == MAX_MODULE_SOFTRESET_WAIT)
+ pr_warning("omap_hwmod: %s: softreset failed (waited %d usec)\n",
+ oh->name, MAX_MODULE_SOFTRESET_WAIT);
+ else
+ pr_debug("omap_hwmod: %s: softreset in %d usec\n", oh->name, c);
+
+ /*
+ * XXX add _HWMOD_STATE_WEDGED for modules that don't come back from
+ * _wait_target_ready() or _reset()
+ */
+
+ ret = (c == MAX_MODULE_SOFTRESET_WAIT) ? -ETIMEDOUT : 0;
+
+dis_opt_clks:
+ if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
+ _disable_optional_clocks(oh);
+
+ return ret;
+}
+
+/**
+ * _reset - reset an omap_hwmod
+ * @oh: struct omap_hwmod *
+ *
+ * Resets an omap_hwmod @oh. The default software reset mechanism for
+ * most OMAP IP blocks is triggered via the OCP_SYSCONFIG.SOFTRESET
+ * bit. However, some hwmods cannot be reset via this method: some
+ * are not targets and therefore have no OCP header registers to
+ * access; others (like the IVA) have idiosyncratic reset sequences.
+ * So for these relatively rare cases, custom reset code can be
+ * supplied in the struct omap_hwmod_class .reset function pointer.
+ * Passes along the return value from either _reset() or the custom
+ * reset function - these must return -EINVAL if the hwmod cannot be
+ * reset this way or if the hwmod is in the wrong state, -ETIMEDOUT if
+ * the module did not reset in time, or 0 upon success.
+ */
+static int _reset(struct omap_hwmod *oh)
+{
+ int ret;
+
+ pr_debug("omap_hwmod: %s: resetting\n", oh->name);
+
+ ret = (oh->class->reset) ? oh->class->reset(oh) : _ocp_softreset(oh);
+
+ return ret;
+}
+
+/**
+ * _enable - enable an omap_hwmod
+ * @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().
+ */
+static int _enable(struct omap_hwmod *oh)
+{
+ int r;
+ int hwsup = 0;
+
+ pr_debug("omap_hwmod: %s: enabling\n", oh->name);
+
+ /*
+ * hwmods with HWMOD_INIT_NO_IDLE flag set are left
+ * in enabled state at init.
+ * Now that someone is really trying to enable them,
+ * just ensure that the hwmod mux is set.
+ */
+ if (oh->_int_flags & _HWMOD_SKIP_ENABLE) {
+ /*
+ * If the caller has mux data populated, do the mux'ing
+ * which wouldn't have been done as part of the _enable()
+ * done during setup.
+ */
+ if (oh->mux)
+ omap_hwmod_mux(oh->mux, _HWMOD_STATE_ENABLED);
+
+ oh->_int_flags &= ~_HWMOD_SKIP_ENABLE;
+ return 0;
+ }
+
+ if (oh->_state != _HWMOD_STATE_INITIALIZED &&
+ oh->_state != _HWMOD_STATE_IDLE &&
+ oh->_state != _HWMOD_STATE_DISABLED) {
+ WARN(1, "omap_hwmod: %s: enabled state can only be entered from initialized, idle, or disabled state\n",
+ oh->name);
+ return -EINVAL;
+ }
+
+
+ /*
+ * If an IP contains only one HW reset line, then de-assert it in order
+ * to allow the module state transition. Otherwise the PRCM will return
+ * Intransition status, and the init will failed.
+ */
+ if ((oh->_state == _HWMOD_STATE_INITIALIZED ||
+ oh->_state == _HWMOD_STATE_DISABLED) && oh->rst_lines_cnt == 1)
+ _deassert_hardreset(oh, oh->rst_lines[0].name);
+
+ /* Mux pins for device runtime if populated */
+ if (oh->mux && (!oh->mux->enabled ||
+ ((oh->_state == _HWMOD_STATE_IDLE) &&
+ oh->mux->pads_dynamic)))
+ omap_hwmod_mux(oh->mux, _HWMOD_STATE_ENABLED);
+
+ _add_initiator_dep(oh, mpu_oh);
+
+ if (oh->clkdm) {
+ /*
+ * A clockdomain must be in SW_SUP before enabling
+ * completely the module. The clockdomain can be set
+ * in HW_AUTO only when the module become ready.
+ */
+ hwsup = clkdm_in_hwsup(oh->clkdm);
+ r = clkdm_hwmod_enable(oh->clkdm, oh);
+ if (r) {
+ WARN(1, "omap_hwmod: %s: could not enable clockdomain %s: %d\n",
+ oh->name, oh->clkdm->name, r);
+ return r;
+ }
+ }
+
+ _enable_clocks(oh);
+ _enable_module(oh);
+
+ r = _wait_target_ready(oh);
+ if (!r) {
+ /*
+ * Set the clockdomain to HW_AUTO only if the target is ready,
+ * assuming that the previous state was HW_AUTO
+ */
+ if (oh->clkdm && hwsup)
+ clkdm_allow_idle(oh->clkdm);
+
+ oh->_state = _HWMOD_STATE_ENABLED;
+
+ /* Access the sysconfig only if the target is ready */
+ if (oh->class->sysc) {
+ if (!(oh->_int_flags & _HWMOD_SYSCONFIG_LOADED))
+ _update_sysc_cache(oh);
+ _enable_sysc(oh);
+ }
+ } else {
+ _disable_clocks(oh);
+ pr_debug("omap_hwmod: %s: _wait_target_ready: %d\n",
+ oh->name, r);
+
+ if (oh->clkdm)
+ clkdm_hwmod_disable(oh->clkdm, oh);
+ }
+
+ return r;
+}
+
+/**
+ * _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.
+ */
+static int _idle(struct omap_hwmod *oh)
+{
+ pr_debug("omap_hwmod: %s: idling\n", oh->name);
+
+ if (oh->_state != _HWMOD_STATE_ENABLED) {
+ WARN(1, "omap_hwmod: %s: idle state can only be entered from enabled state\n",
+ oh->name);
+ return -EINVAL;
+ }
+
+ if (oh->class->sysc)
+ _idle_sysc(oh);
+ _del_initiator_dep(oh, mpu_oh);
+
+ _omap4_disable_module(oh);
+
+ /*
+ * The module must be in idle mode before disabling any parents
+ * clocks. Otherwise, the parent clock might be disabled before
+ * the module transition is done, and thus will prevent the
+ * transition to complete properly.
+ */
+ _disable_clocks(oh);
+ if (oh->clkdm)
+ clkdm_hwmod_disable(oh->clkdm, oh);
+
+ /* Mux pins for device idle if populated */
+ if (oh->mux && oh->mux->pads_dynamic)
+ omap_hwmod_mux(oh->mux, _HWMOD_STATE_IDLE);
+
+ oh->_state = _HWMOD_STATE_IDLE;
+
+ return 0;
+}
+
+/**
+ * omap_hwmod_set_ocp_autoidle - set the hwmod's OCP autoidle bit
+ * @oh: struct omap_hwmod *
+ * @autoidle: desired AUTOIDLE bitfield value (0 or 1)
+ *
+ * Sets the IP block's OCP autoidle bit in hardware, and updates our
+ * local copy. Intended to be used by drivers that require
+ * direct manipulation of the AUTOIDLE bits.
+ * Returns -EINVAL if @oh is null or is not in the ENABLED state, or passes
+ * along the return value from _set_module_autoidle().
+ *
+ * Any users of this function should be scrutinized carefully.
+ */
+int omap_hwmod_set_ocp_autoidle(struct omap_hwmod *oh, u8 autoidle)
+{
+ u32 v;
+ int retval = 0;
+ unsigned long flags;
+
+ if (!oh || oh->_state != _HWMOD_STATE_ENABLED)
+ return -EINVAL;
+
+ spin_lock_irqsave(&oh->_lock, flags);
+
+ v = oh->_sysc_cache;
+
+ retval = _set_module_autoidle(oh, autoidle, &v);
+
+ if (!retval)
+ _write_sysconfig(v, oh);
+
+ spin_unlock_irqrestore(&oh->_lock, flags);
+
+ return retval;
+}
+
+/**
+ * _shutdown - shutdown an omap_hwmod
+ * @oh: struct omap_hwmod *
+ *
+ * Shut down an omap_hwmod @oh. This should be called when the driver
+ * used for the hwmod is removed or unloaded or if the driver is not
+ * used by the system. Returns -EINVAL if the hwmod is in the wrong
+ * state or returns 0.
+ */
+static int _shutdown(struct omap_hwmod *oh)
+{
+ int ret;
+ u8 prev_state;
+
+ if (oh->_state != _HWMOD_STATE_IDLE &&
+ oh->_state != _HWMOD_STATE_ENABLED) {
+ WARN(1, "omap_hwmod: %s: disabled state can only be entered from idle, or enabled state\n",
+ oh->name);
+ return -EINVAL;
+ }
+
+ pr_debug("omap_hwmod: %s: disabling\n", oh->name);
+
+ if (oh->class->pre_shutdown) {
+ prev_state = oh->_state;
+ if (oh->_state == _HWMOD_STATE_IDLE)
+ _enable(oh);
+ ret = oh->class->pre_shutdown(oh);
+ if (ret) {
+ if (prev_state == _HWMOD_STATE_IDLE)
+ _idle(oh);
+ return ret;
+ }
+ }
+
+ if (oh->class->sysc) {
+ if (oh->_state == _HWMOD_STATE_IDLE)
+ _enable(oh);
+ _shutdown_sysc(oh);
+ }
+
+ /* clocks and deps are already disabled in idle */
+ if (oh->_state == _HWMOD_STATE_ENABLED) {
+ _del_initiator_dep(oh, mpu_oh);
+ /* XXX what about the other system initiators here? dma, dsp */
+ _omap4_disable_module(oh);
+ _disable_clocks(oh);
+ if (oh->clkdm)
+ clkdm_hwmod_disable(oh->clkdm, oh);
+ }
+ /* XXX Should this code also force-disable the optional clocks? */
+
+ /*
+ * If an IP contains only one HW reset line, then assert it
+ * after disabling the clocks and before shutting down the IP.
+ */
+ if (oh->rst_lines_cnt == 1)
+ _assert_hardreset(oh, oh->rst_lines[0].name);
+
+ /* Mux pins to safe mode or use populated off mode values */
+ if (oh->mux)
+ omap_hwmod_mux(oh->mux, _HWMOD_STATE_DISABLED);
+
+ oh->_state = _HWMOD_STATE_DISABLED;
+
+ return 0;
+}
+
+/**
+ * _setup - do initial configuration of omap_hwmod
+ * @oh: struct omap_hwmod *
+ *
+ * Writes the CLOCKACTIVITY bits @clockact to the hwmod @oh
+ * OCP_SYSCONFIG register. Returns 0.
+ */
+static int _setup(struct omap_hwmod *oh, void *data)
+{
+ int i, r;
+ u8 postsetup_state;
+
+ if (oh->_state != _HWMOD_STATE_CLKS_INITED)
+ return 0;
+
+ /* Set iclk autoidle mode */
+ if (oh->slaves_cnt > 0) {
+ for (i = 0; i < oh->slaves_cnt; i++) {
+ struct omap_hwmod_ocp_if *os = oh->slaves[i];
+ struct clk *c = os->_clk;
+
+ if (!c)
+ continue;
+
+ if (os->flags & OCPIF_SWSUP_IDLE) {
+ /* XXX omap_iclk_deny_idle(c); */
+ } else {
+ /* XXX omap_iclk_allow_idle(c); */
+ clk_enable(c);
+ }
+ }
+ }
+
+ oh->_state = _HWMOD_STATE_INITIALIZED;
+
+ /*
+ * In the case of hwmod with hardreset that should not be
+ * de-assert at boot time, we have to keep the module
+ * initialized, because we cannot enable it properly with the
+ * reset asserted. Exit without warning because that behavior is
+ * expected.
+ */
+ if ((oh->flags & HWMOD_INIT_NO_RESET) && oh->rst_lines_cnt == 1)
+ return 0;
+
+ r = _enable(oh);
+ if (r) {
+ pr_warning("omap_hwmod: %s: cannot be enabled (%d)\n",
+ oh->name, oh->_state);
+ return 0;
+ }
+
+ if (!(oh->flags & HWMOD_INIT_NO_RESET)) {
+ _reset(oh);
+
+ /*
+ * OCP_SYSCONFIG bits need to be reprogrammed after a softreset.
+ * The _enable() function should be split to
+ * avoid the rewrite of the OCP_SYSCONFIG register.
+ */
+ if (oh->class->sysc) {
+ _update_sysc_cache(oh);
+ _enable_sysc(oh);
+ }
+ }
+
+ postsetup_state = oh->_postsetup_state;
+ if (postsetup_state == _HWMOD_STATE_UNKNOWN)
+ postsetup_state = _HWMOD_STATE_ENABLED;
+
+ /*
+ * XXX HWMOD_INIT_NO_IDLE does not belong in hwmod data -
+ * it should be set by the core code as a runtime flag during startup
+ */
+ if ((oh->flags & HWMOD_INIT_NO_IDLE) &&
+ (postsetup_state == _HWMOD_STATE_IDLE)) {
+ oh->_int_flags |= _HWMOD_SKIP_ENABLE;
+ postsetup_state = _HWMOD_STATE_ENABLED;
+ }
+
+ if (postsetup_state == _HWMOD_STATE_IDLE)
+ _idle(oh);
+ else if (postsetup_state == _HWMOD_STATE_DISABLED)
+ _shutdown(oh);
+ else if (postsetup_state != _HWMOD_STATE_ENABLED)
+ WARN(1, "hwmod: %s: unknown postsetup state %d! defaulting to enabled\n",
+ oh->name, postsetup_state);
+
+ return 0;
+}
+
+/**
+ * _register - register a struct omap_hwmod
+ * @oh: struct omap_hwmod *
+ *
+ * Registers the omap_hwmod @oh. Returns -EEXIST if an omap_hwmod
+ * already has been registered by the same name; -EINVAL if the
+ * omap_hwmod is in the wrong state, if @oh is NULL, if the
+ * omap_hwmod's class field is NULL; if the omap_hwmod is missing a
+ * name, or if the omap_hwmod's class is missing a name; or 0 upon
+ * success.
+ *
+ * XXX The data should be copied into bootmem, so the original data
+ * should be marked __initdata and freed after init. This would allow
+ * unneeded omap_hwmods to be freed on multi-OMAP configurations. Note
+ * that the copy process would be relatively complex due to the large number
+ * of substructures.
+ */
+static int __init _register(struct omap_hwmod *oh)
+{
+ int ms_id;
+
+ if (!oh || !oh->name || !oh->class || !oh->class->name ||
+ (oh->_state != _HWMOD_STATE_UNKNOWN))
+ return -EINVAL;
+
+ pr_debug("omap_hwmod: %s: registering\n", oh->name);
+
+ if (_lookup(oh->name))
+ return -EEXIST;
+
+ ms_id = _find_mpu_port_index(oh);
+ if (!IS_ERR_VALUE(ms_id))
+ oh->_mpu_port_index = ms_id;
+ else
+ oh->_int_flags |= _HWMOD_NO_MPU_PORT;
+
+ list_add_tail(&oh->node, &omap_hwmod_list);
+
+ spin_lock_init(&oh->_lock);
+
+ oh->_state = _HWMOD_STATE_REGISTERED;
+
+ /*
+ * XXX Rather than doing a strcmp(), this should test a flag
+ * set in the hwmod data, inserted by the autogenerator code.
+ */
+ if (!strcmp(oh->name, MPU_INITIATOR_NAME))
+ mpu_oh = oh;
+
+ return 0;
+}
+
+
+/* Public functions */
+
+u32 omap_hwmod_read(struct omap_hwmod *oh, u16 reg_offs)
+{
+ if (oh->flags & HWMOD_16BIT_REG)
+ return __raw_readw(oh->_mpu_rt_va + reg_offs);
+ else
+ return __raw_readl(oh->_mpu_rt_va + reg_offs);
+}
+
+void omap_hwmod_write(u32 v, struct omap_hwmod *oh, u16 reg_offs)
+{
+ if (oh->flags & HWMOD_16BIT_REG)
+ __raw_writew(v, oh->_mpu_rt_va + reg_offs);
+ else
+ __raw_writel(v, oh->_mpu_rt_va + reg_offs);
+}
+
+/**
+ * omap_hwmod_softreset - reset a module via SYSCONFIG.SOFTRESET bit
+ * @oh: struct omap_hwmod *
+ *
+ * This is a public function exposed to drivers. Some drivers may need to do
+ * some settings before and after resetting the device. Those drivers after
+ * doing the necessary settings could use this function to start a reset by
+ * setting the SYSCONFIG.SOFTRESET bit.
+ */
+int omap_hwmod_softreset(struct omap_hwmod *oh)
+{
+ u32 v;
+ int ret;
+
+ if (!oh || !(oh->_sysc_cache))
+ return -EINVAL;
+
+ v = oh->_sysc_cache;
+ ret = _set_softreset(oh, &v);
+ if (ret)
+ goto error;
+ _write_sysconfig(v, oh);
+
+error:
+ return ret;
+}
+
+/**
+ * omap_hwmod_set_slave_idlemode - set the hwmod's OCP slave idlemode
+ * @oh: struct omap_hwmod *
+ * @idlemode: SIDLEMODE field bits (shifted to bit 0)
+ *
+ * Sets the IP block's OCP slave idlemode in hardware, and updates our
+ * local copy. Intended to be used by drivers that have some erratum
+ * that requires direct manipulation of the SIDLEMODE bits. Returns
+ * -EINVAL if @oh is null, or passes along the return value from
+ * _set_slave_idlemode().
+ *
+ * XXX Does this function have any current users? If not, we should
+ * remove it; it is better to let the rest of the hwmod code handle this.
+ * Any users of this function should be scrutinized carefully.
+ */
+int omap_hwmod_set_slave_idlemode(struct omap_hwmod *oh, u8 idlemode)
+{
+ u32 v;
+ int retval = 0;
+
+ if (!oh)
+ return -EINVAL;
+
+ v = oh->_sysc_cache;
+
+ retval = _set_slave_idlemode(oh, idlemode, &v);
+ if (!retval)
+ _write_sysconfig(v, oh);
+
+ return retval;
+}
+
+/**
+ * omap_hwmod_lookup - look up a registered omap_hwmod by name
+ * @name: name of the omap_hwmod to look up
+ *
+ * Given a @name of an omap_hwmod, return a pointer to the registered
+ * struct omap_hwmod *, or NULL upon error.
+ */
+struct omap_hwmod *omap_hwmod_lookup(const char *name)
+{
+ struct omap_hwmod *oh;
+
+ if (!name)
+ return NULL;
+
+ oh = _lookup(name);
+
+ return oh;
+}
+
+/**
+ * omap_hwmod_for_each - call function for each registered omap_hwmod
+ * @fn: pointer to a callback function
+ * @data: void * data to pass to callback function
+ *
+ * Call @fn for each registered omap_hwmod, passing @data to each
+ * function. @fn must return 0 for success or any other value for
+ * failure. If @fn returns non-zero, the iteration across omap_hwmods
+ * will stop and the non-zero return value will be passed to the
+ * caller of omap_hwmod_for_each(). @fn is called with
+ * omap_hwmod_for_each() held.
+ */
+int omap_hwmod_for_each(int (*fn)(struct omap_hwmod *oh, void *data),
+ void *data)
+{
+ struct omap_hwmod *temp_oh;
+ int ret = 0;
+
+ if (!fn)
+ return -EINVAL;
+
+ list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
+ ret = (*fn)(temp_oh, data);
+ if (ret)
+ break;
+ }
+
+ return ret;
+}
+
+/**
+ * omap_hwmod_register - register an array of hwmods
+ * @ohs: pointer to an array of omap_hwmods to register
+ *
+ * Intended to be called early in boot before the clock framework is
+ * initialized. If @ohs is not null, will register all omap_hwmods
+ * listed in @ohs that are valid for this chip. Returns 0.
+ */
+int __init omap_hwmod_register(struct omap_hwmod **ohs)
+{
+ int r, i;
+
+ if (!ohs)
+ return 0;
+
+ i = 0;
+ do {
+ r = _register(ohs[i]);
+ WARN(r, "omap_hwmod: %s: _register returned %d\n", ohs[i]->name,
+ r);
+ } while (ohs[++i]);
+
+ return 0;
+}
+
+/*
+ * _populate_mpu_rt_base - populate the virtual address for a hwmod
+ *
+ * Must be called only from omap_hwmod_setup_*() so ioremap works properly.
+ * Assumes the caller takes care of locking if needed.
+ */
+static int __init _populate_mpu_rt_base(struct omap_hwmod *oh, void *data)
+{
+ if (oh->_state != _HWMOD_STATE_REGISTERED)
+ return 0;
+
+ if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
+ return 0;
+
+ oh->_mpu_rt_va = _find_mpu_rt_base(oh, oh->_mpu_port_index);
+
+ return 0;
+}
+
+/**
+ * omap_hwmod_setup_one - set up a single hwmod
+ * @oh_name: const char * name of the already-registered hwmod to set up
+ *
+ * Must be called after omap2_clk_init(). Resolves the struct clk
+ * names to struct clk pointers for each registered omap_hwmod. Also
+ * calls _setup() on each hwmod. Returns -EINVAL upon error or 0 upon
+ * success.
+ */
+int __init omap_hwmod_setup_one(const char *oh_name)
+{
+ struct omap_hwmod *oh;
+ int r;
+
+ pr_debug("omap_hwmod: %s: %s\n", oh_name, __func__);
+
+ if (!mpu_oh) {
+ pr_err("omap_hwmod: %s: cannot setup_one: MPU initiator hwmod %s not yet registered\n",
+ oh_name, MPU_INITIATOR_NAME);
+ return -EINVAL;
+ }
+
+ oh = _lookup(oh_name);
+ if (!oh) {
+ WARN(1, "omap_hwmod: %s: hwmod not yet registered\n", oh_name);
+ return -EINVAL;
+ }
+
+ if (mpu_oh->_state == _HWMOD_STATE_REGISTERED && oh != mpu_oh)
+ omap_hwmod_setup_one(MPU_INITIATOR_NAME);
+
+ r = _populate_mpu_rt_base(oh, NULL);
+ if (IS_ERR_VALUE(r)) {
+ WARN(1, "omap_hwmod: %s: couldn't set mpu_rt_base\n", oh_name);
+ return -EINVAL;
+ }
+
+ r = _init_clocks(oh, NULL);
+ if (IS_ERR_VALUE(r)) {
+ WARN(1, "omap_hwmod: %s: couldn't init clocks\n", oh_name);
+ return -EINVAL;
+ }
+
+ _setup(oh, NULL);
+
+ return 0;
+}
+
+/**
+ * omap_hwmod_setup - do some post-clock framework initialization
+ *
+ * Must be called after omap2_clk_init(). Resolves the struct clk names
+ * to struct clk pointers for each registered omap_hwmod. Also calls
+ * _setup() on each hwmod. Returns 0 upon success.
+ */
+static int __init omap_hwmod_setup_all(void)
+{
+ int r;
+
+ if (!mpu_oh) {
+ pr_err("omap_hwmod: %s: MPU initiator hwmod %s not yet registered\n",
+ __func__, MPU_INITIATOR_NAME);
+ return -EINVAL;
+ }
+
+ r = omap_hwmod_for_each(_populate_mpu_rt_base, NULL);
+
+ r = omap_hwmod_for_each(_init_clocks, NULL);
+ WARN(IS_ERR_VALUE(r),
+ "omap_hwmod: %s: _init_clocks failed\n", __func__);
+
+ omap_hwmod_for_each(_setup, NULL);
+
+ return 0;
+}
+core_initcall(omap_hwmod_setup_all);
+
+/**
+ * omap_hwmod_enable - enable an omap_hwmod
+ * @oh: struct omap_hwmod *
+ *
+ * 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)
+{
+ int r;
+ unsigned long flags;
+
+ if (!oh)
+ return -EINVAL;
+
+ spin_lock_irqsave(&oh->_lock, flags);
+ r = _enable(oh);
+ spin_unlock_irqrestore(&oh->_lock, flags);
+
+ return r;
+}
+
+/**
+ * omap_hwmod_idle - idle an omap_hwmod
+ * @oh: struct omap_hwmod *
+ *
+ * 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)
+{
+ unsigned long flags;
+
+ if (!oh)
+ return -EINVAL;
+
+ spin_lock_irqsave(&oh->_lock, flags);
+ _idle(oh);
+ spin_unlock_irqrestore(&oh->_lock, flags);
+
+ return 0;
+}
+
+/**
+ * omap_hwmod_shutdown - shutdown an omap_hwmod
+ * @oh: struct omap_hwmod *
+ *
+ * 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().
+ */
+int omap_hwmod_shutdown(struct omap_hwmod *oh)
+{
+ unsigned long flags;
+
+ if (!oh)
+ return -EINVAL;
+
+ spin_lock_irqsave(&oh->_lock, flags);
+ _shutdown(oh);
+ spin_unlock_irqrestore(&oh->_lock, flags);
+
+ return 0;
+}
+
+/**
+ * omap_hwmod_enable_clocks - enable main_clk, all interface clocks
+ * @oh: struct omap_hwmod *oh
+ *
+ * Intended to be called by the omap_device code.
+ */
+int omap_hwmod_enable_clocks(struct omap_hwmod *oh)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&oh->_lock, flags);
+ _enable_clocks(oh);
+ spin_unlock_irqrestore(&oh->_lock, flags);
+
+ return 0;
+}
+
+/**
+ * omap_hwmod_disable_clocks - disable main_clk, all interface clocks
+ * @oh: struct omap_hwmod *oh
+ *
+ * Intended to be called by the omap_device code.
+ */
+int omap_hwmod_disable_clocks(struct omap_hwmod *oh)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&oh->_lock, flags);
+ _disable_clocks(oh);
+ spin_unlock_irqrestore(&oh->_lock, flags);
+
+ return 0;
+}
+
+/**
+ * omap_hwmod_ocp_barrier - wait for posted writes against the hwmod to complete
+ * @oh: struct omap_hwmod *oh
+ *
+ * Intended to be called by drivers and core code when all posted
+ * writes to a device must complete before continuing further
+ * execution (for example, after clearing some device IRQSTATUS
+ * register bits)
+ *
+ * XXX what about targets with multiple OCP threads?
+ */
+void omap_hwmod_ocp_barrier(struct omap_hwmod *oh)
+{
+ BUG_ON(!oh);
+
+ if (!oh->class->sysc || !oh->class->sysc->sysc_flags) {
+ WARN(1, "omap_device: %s: OCP barrier impossible due to device configuration\n",
+ oh->name);
+ return;
+ }
+
+ /*
+ * Forces posted writes to complete on the OCP thread handling
+ * register writes
+ */
+ omap_hwmod_read(oh, oh->class->sysc->sysc_offs);
+}
+
+/**
+ * omap_hwmod_reset - reset the hwmod
+ * @oh: struct omap_hwmod *
+ *
+ * Under some conditions, a driver may wish to reset the entire device.
+ * Called from omap_device code. Returns -EINVAL on error or passes along
+ * the return value from _reset().
+ */
+int omap_hwmod_reset(struct omap_hwmod *oh)
+{
+ int r;
+ unsigned long flags;
+
+ if (!oh)
+ return -EINVAL;
+
+ spin_lock_irqsave(&oh->_lock, flags);
+ r = _reset(oh);
+ spin_unlock_irqrestore(&oh->_lock, flags);
+
+ return r;
+}
+
+/**
+ * omap_hwmod_count_resources - count number of struct resources needed by hwmod
+ * @oh: struct omap_hwmod *
+ * @res: pointer to the first element of an array of struct resource to fill
+ *
+ * Count the number of struct resource array elements necessary to
+ * contain omap_hwmod @oh resources. Intended to be called by code
+ * that registers omap_devices. Intended to be used to determine the
+ * size of a dynamically-allocated struct resource array, before
+ * calling omap_hwmod_fill_resources(). Returns the number of struct
+ * resource array elements needed.
+ *
+ * XXX This code is not optimized. It could attempt to merge adjacent
+ * resource IDs.
+ *
+ */
+int omap_hwmod_count_resources(struct omap_hwmod *oh)
+{
+ int ret, i;
+
+ ret = _count_mpu_irqs(oh) + _count_sdma_reqs(oh);
+
+ for (i = 0; i < oh->slaves_cnt; i++)
+ ret += _count_ocp_if_addr_spaces(oh->slaves[i]);
+
+ return ret;
+}
+
+/**
+ * omap_hwmod_fill_resources - fill struct resource array with hwmod data
+ * @oh: struct omap_hwmod *
+ * @res: pointer to the first element of an array of struct resource to fill
+ *
+ * Fill the struct resource array @res with resource data from the
+ * omap_hwmod @oh. Intended to be called by code that registers
+ * omap_devices. See also omap_hwmod_count_resources(). Returns the
+ * number of array elements filled.
+ */
+int omap_hwmod_fill_resources(struct omap_hwmod *oh, struct resource *res)
+{
+ int i, j, mpu_irqs_cnt, sdma_reqs_cnt;
+ int r = 0;
+
+ /* For each IRQ, DMA, memory area, fill in array.*/
+
+ mpu_irqs_cnt = _count_mpu_irqs(oh);
+ for (i = 0; i < mpu_irqs_cnt; i++) {
+ (res + r)->name = (oh->mpu_irqs + i)->name;
+ (res + r)->start = (oh->mpu_irqs + i)->irq;
+ (res + r)->end = (oh->mpu_irqs + i)->irq;
+ (res + r)->flags = IORESOURCE_IRQ;
+ r++;
+ }
+
+ sdma_reqs_cnt = _count_sdma_reqs(oh);
+ for (i = 0; i < sdma_reqs_cnt; i++) {
+ (res + r)->name = (oh->sdma_reqs + i)->name;
+ (res + r)->start = (oh->sdma_reqs + i)->dma_req;
+ (res + r)->end = (oh->sdma_reqs + i)->dma_req;
+ (res + r)->flags = IORESOURCE_DMA;
+ r++;
+ }
+
+ for (i = 0; i < oh->slaves_cnt; i++) {
+ struct omap_hwmod_ocp_if *os;
+ int addr_cnt;
+
+ os = oh->slaves[i];
+ addr_cnt = _count_ocp_if_addr_spaces(os);
+
+ for (j = 0; j < addr_cnt; j++) {
+ (res + r)->name = (os->addr + j)->name;
+ (res + r)->start = (os->addr + j)->pa_start;
+ (res + r)->end = (os->addr + j)->pa_end;
+ (res + r)->flags = IORESOURCE_MEM;
+ r++;
+ }
+ }
+
+ return r;
+}
+
+/**
+ * omap_hwmod_get_pwrdm - return pointer to this module's main powerdomain
+ * @oh: struct omap_hwmod *
+ *
+ * Return the powerdomain pointer associated with the OMAP module
+ * @oh's main clock. If @oh does not have a main clk, return the
+ * powerdomain associated with the interface clock associated with the
+ * module's MPU port. (XXX Perhaps this should use the SDMA port
+ * instead?) Returns NULL on error, or a struct powerdomain * on
+ * success.
+ */
+struct powerdomain *omap_hwmod_get_pwrdm(struct omap_hwmod *oh)
+{
+ struct clk *c;
+
+ if (!oh)
+ return NULL;
+
+ if (oh->_clk) {
+ c = oh->_clk;
+ } else {
+ if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
+ return NULL;
+ c = oh->slaves[oh->_mpu_port_index]->_clk;
+ }
+
+ if (!c->clkdm)
+ return NULL;
+
+ return c->clkdm->pwrdm.ptr;
+
+}
+
+/**
+ * omap_hwmod_get_mpu_rt_va - return the module's base address (for the MPU)
+ * @oh: struct omap_hwmod *
+ *
+ * Returns the virtual address corresponding to the beginning of the
+ * module's register target, in the address range that is intended to
+ * be used by the MPU. Returns the virtual address upon success or NULL
+ * upon error.
+ */
+void __iomem *omap_hwmod_get_mpu_rt_va(struct omap_hwmod *oh)
+{
+ if (!oh)
+ return NULL;
+
+ if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
+ return NULL;
+
+ if (oh->_state == _HWMOD_STATE_UNKNOWN)
+ return NULL;
+
+ return oh->_mpu_rt_va;
+}
+
+/**
+ * omap_hwmod_add_initiator_dep - add sleepdep from @init_oh to @oh
+ * @oh: struct omap_hwmod *
+ * @init_oh: struct omap_hwmod * (initiator)
+ *
+ * Add a sleep dependency between the initiator @init_oh and @oh.
+ * Intended to be called by DSP/Bridge code via platform_data for the
+ * DSP case; and by the DMA code in the sDMA case. DMA code, *Bridge
+ * code needs to add/del initiator dependencies dynamically
+ * before/after accessing a device. Returns the return value from
+ * _add_initiator_dep().
+ *
+ * XXX Keep a usecount in the clockdomain code
+ */
+int omap_hwmod_add_initiator_dep(struct omap_hwmod *oh,
+ struct omap_hwmod *init_oh)
+{
+ return _add_initiator_dep(oh, init_oh);
+}
+
+/*
+ * XXX what about functions for drivers to save/restore ocp_sysconfig
+ * for context save/restore operations?
+ */
+
+/**
+ * omap_hwmod_del_initiator_dep - remove sleepdep from @init_oh to @oh
+ * @oh: struct omap_hwmod *
+ * @init_oh: struct omap_hwmod * (initiator)
+ *
+ * Remove a sleep dependency between the initiator @init_oh and @oh.
+ * Intended to be called by DSP/Bridge code via platform_data for the
+ * DSP case; and by the DMA code in the sDMA case. DMA code, *Bridge
+ * code needs to add/del initiator dependencies dynamically
+ * before/after accessing a device. Returns the return value from
+ * _del_initiator_dep().
+ *
+ * XXX Keep a usecount in the clockdomain code
+ */
+int omap_hwmod_del_initiator_dep(struct omap_hwmod *oh,
+ struct omap_hwmod *init_oh)
+{
+ return _del_initiator_dep(oh, init_oh);
+}
+
+/**
+ * omap_hwmod_enable_wakeup - allow device to wake up the system
+ * @oh: struct omap_hwmod *
+ *
+ * Sets the module OCP socket ENAWAKEUP bit to allow the module to
+ * send wakeups to the PRCM. Eventually this should sets PRCM wakeup
+ * registers to cause the PRCM to receive wakeup events from the
+ * module. Does not set any wakeup routing registers beyond this
+ * point - if the module is to wake up any other module or subsystem,
+ * that must be set separately. Called by omap_device code. Returns
+ * -EINVAL on error or 0 upon success.
+ */
+int omap_hwmod_enable_wakeup(struct omap_hwmod *oh)
+{
+ unsigned long flags;
+ u32 v;
+
+ if (!oh->class->sysc ||
+ !(oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP))
+ return -EINVAL;
+
+ spin_lock_irqsave(&oh->_lock, flags);
+ v = oh->_sysc_cache;
+ _enable_wakeup(oh, &v);
+ _write_sysconfig(v, oh);
+ _set_idle_ioring_wakeup(oh, true);
+ spin_unlock_irqrestore(&oh->_lock, flags);
+
+ return 0;
+}
+
+/**
+ * omap_hwmod_disable_wakeup - prevent device from waking the system
+ * @oh: struct omap_hwmod *
+ *
+ * Clears the module OCP socket ENAWAKEUP bit to prevent the module
+ * from sending wakeups to the PRCM. Eventually this should clear
+ * PRCM wakeup registers to cause the PRCM to ignore wakeup events
+ * from the module. Does not set any wakeup routing registers beyond
+ * this point - if the module is to wake up any other module or
+ * subsystem, that must be set separately. Called by omap_device
+ * code. Returns -EINVAL on error or 0 upon success.
+ */
+int omap_hwmod_disable_wakeup(struct omap_hwmod *oh)
+{
+ unsigned long flags;
+ u32 v;
+
+ if (!oh->class->sysc ||
+ !(oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP))
+ return -EINVAL;
+
+ spin_lock_irqsave(&oh->_lock, flags);
+ v = oh->_sysc_cache;
+ _disable_wakeup(oh, &v);
+ _write_sysconfig(v, oh);
+ _set_idle_ioring_wakeup(oh, false);
+ spin_unlock_irqrestore(&oh->_lock, flags);
+
+ return 0;
+}
+
+/**
+ * omap_hwmod_assert_hardreset - assert the HW reset line of submodules
+ * contained in the hwmod module.
+ * @oh: struct omap_hwmod *
+ * @name: name of the reset line to lookup and assert
+ *
+ * Some IP like dsp, ipu or iva contain processor that require
+ * an HW reset line to be assert / deassert in order to enable fully
+ * the IP. Returns -EINVAL if @oh is null or if the operation is not
+ * yet supported on this OMAP; otherwise, passes along the return value
+ * from _assert_hardreset().
+ */
+int omap_hwmod_assert_hardreset(struct omap_hwmod *oh, const char *name)
+{
+ int ret;
+ unsigned long flags;
+
+ if (!oh)
+ return -EINVAL;
+
+ spin_lock_irqsave(&oh->_lock, flags);
+ ret = _assert_hardreset(oh, name);
+ spin_unlock_irqrestore(&oh->_lock, flags);
+
+ return ret;
+}
+
+/**
+ * omap_hwmod_deassert_hardreset - deassert the HW reset line of submodules
+ * contained in the hwmod module.
+ * @oh: struct omap_hwmod *
+ * @name: name of the reset line to look up and deassert
+ *
+ * Some IP like dsp, ipu or iva contain processor that require
+ * an HW reset line to be assert / deassert in order to enable fully
+ * the IP. Returns -EINVAL if @oh is null or if the operation is not
+ * yet supported on this OMAP; otherwise, passes along the return value
+ * from _deassert_hardreset().
+ */
+int omap_hwmod_deassert_hardreset(struct omap_hwmod *oh, const char *name)
+{
+ int ret;
+ unsigned long flags;
+
+ if (!oh)
+ return -EINVAL;
+
+ spin_lock_irqsave(&oh->_lock, flags);
+ ret = _deassert_hardreset(oh, name);
+ spin_unlock_irqrestore(&oh->_lock, flags);
+
+ return ret;
+}
+
+/**
+ * omap_hwmod_read_hardreset - read the HW reset line state of submodules
+ * contained in the hwmod module
+ * @oh: struct omap_hwmod *
+ * @name: name of the reset line to look up and read
+ *
+ * Return the current state of the hwmod @oh's reset line named @name:
+ * returns -EINVAL upon parameter error or if this operation
+ * is unsupported on the current OMAP; otherwise, passes along the return
+ * value from _read_hardreset().
+ */
+int omap_hwmod_read_hardreset(struct omap_hwmod *oh, const char *name)
+{
+ int ret;
+ unsigned long flags;
+
+ if (!oh)
+ return -EINVAL;
+
+ spin_lock_irqsave(&oh->_lock, flags);
+ ret = _read_hardreset(oh, name);
+ spin_unlock_irqrestore(&oh->_lock, flags);
+
+ return ret;
+}
+
+
+/**
+ * omap_hwmod_for_each_by_class - call @fn for each hwmod of class @classname
+ * @classname: struct omap_hwmod_class name to search for
+ * @fn: callback function pointer to call for each hwmod in class @classname
+ * @user: arbitrary context data to pass to the callback function
+ *
+ * For each omap_hwmod of class @classname, call @fn.
+ * If the callback function returns something other than
+ * zero, the iterator is terminated, and the callback function's return
+ * value is passed back to the caller. Returns 0 upon success, -EINVAL
+ * if @classname or @fn are NULL, or passes back the error code from @fn.
+ */
+int omap_hwmod_for_each_by_class(const char *classname,
+ int (*fn)(struct omap_hwmod *oh,
+ void *user),
+ void *user)
+{
+ struct omap_hwmod *temp_oh;
+ int ret = 0;
+
+ if (!classname || !fn)
+ return -EINVAL;
+
+ pr_debug("omap_hwmod: %s: looking for modules of class %s\n",
+ __func__, classname);
+
+ list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
+ if (!strcmp(temp_oh->class->name, classname)) {
+ pr_debug("omap_hwmod: %s: %s: calling callback fn\n",
+ __func__, temp_oh->name);
+ ret = (*fn)(temp_oh, user);
+ if (ret)
+ break;
+ }
+ }
+
+ if (ret)
+ pr_debug("omap_hwmod: %s: iterator terminated early: %d\n",
+ __func__, ret);
+
+ return ret;
+}
+
+/**
+ * omap_hwmod_set_postsetup_state - set the post-_setup() state for this hwmod
+ * @oh: struct omap_hwmod *
+ * @state: state that _setup() should leave the hwmod in
+ *
+ * Sets the hwmod state that @oh will enter at the end of _setup()
+ * (called by omap_hwmod_setup_*()). Only valid to call between
+ * calling omap_hwmod_register() and omap_hwmod_setup_*(). Returns
+ * 0 upon success or -EINVAL if there is a problem with the arguments
+ * or if the hwmod is in the wrong state.
+ */
+int omap_hwmod_set_postsetup_state(struct omap_hwmod *oh, u8 state)
+{
+ int ret;
+ unsigned long flags;
+
+ if (!oh)
+ return -EINVAL;
+
+ if (state != _HWMOD_STATE_DISABLED &&
+ state != _HWMOD_STATE_ENABLED &&
+ state != _HWMOD_STATE_IDLE)
+ return -EINVAL;
+
+ spin_lock_irqsave(&oh->_lock, flags);
+
+ if (oh->_state != _HWMOD_STATE_REGISTERED) {
+ ret = -EINVAL;
+ goto ohsps_unlock;
+ }
+
+ oh->_postsetup_state = state;
+ ret = 0;
+
+ohsps_unlock:
+ spin_unlock_irqrestore(&oh->_lock, flags);
+
+ return ret;
+}
+
+/**
+ * omap_hwmod_get_context_loss_count - get lost context count
+ * @oh: struct omap_hwmod *
+ *
+ * Query the powerdomain of of @oh to get the context loss
+ * count for this device.
+ *
+ * Returns the context loss count of the powerdomain assocated with @oh
+ * upon success, or zero if no powerdomain exists for @oh.
+ */
+int omap_hwmod_get_context_loss_count(struct omap_hwmod *oh)
+{
+ struct powerdomain *pwrdm;
+ int ret = 0;
+
+ pwrdm = omap_hwmod_get_pwrdm(oh);
+ if (pwrdm)
+ ret = pwrdm_get_context_loss_count(pwrdm);
+
+ return ret;
+}
+
+/**
+ * omap_hwmod_no_setup_reset - prevent a hwmod from being reset upon setup
+ * @oh: struct omap_hwmod *
+ *
+ * Prevent the hwmod @oh from being reset during the setup process.
+ * Intended for use by board-*.c files on boards with devices that
+ * cannot tolerate being reset. Must be called before the hwmod has
+ * been set up. Returns 0 upon success or negative error code upon
+ * failure.
+ */
+int omap_hwmod_no_setup_reset(struct omap_hwmod *oh)
+{
+ if (!oh)
+ return -EINVAL;
+
+ if (oh->_state != _HWMOD_STATE_REGISTERED) {
+ pr_err("omap_hwmod: %s: cannot prevent setup reset; in wrong state\n",
+ oh->name);
+ return -EINVAL;
+ }
+
+ oh->flags |= HWMOD_INIT_NO_RESET;
+
+ return 0;
+}
+
+/**
+ * omap_hwmod_pad_route_irq - route an I/O pad wakeup to a particular MPU IRQ
+ * @oh: struct omap_hwmod * containing hwmod mux entries
+ * @pad_idx: array index in oh->mux of the hwmod mux entry to route wakeup
+ * @irq_idx: the hwmod mpu_irqs array index of the IRQ to trigger on wakeup
+ *
+ * When an I/O pad wakeup arrives for the dynamic or wakeup hwmod mux
+ * entry number @pad_idx for the hwmod @oh, trigger the interrupt
+ * service routine for the hwmod's mpu_irqs array index @irq_idx. If
+ * this function is not called for a given pad_idx, then the ISR
+ * associated with @oh's first MPU IRQ will be triggered when an I/O
+ * pad wakeup occurs on that pad. Note that @pad_idx is the index of
+ * the _dynamic or wakeup_ entry: if there are other entries not
+ * marked with OMAP_DEVICE_PAD_WAKEUP or OMAP_DEVICE_PAD_REMUX, these
+ * entries are NOT COUNTED in the dynamic pad index. This function
+ * must be called separately for each pad that requires its interrupt
+ * to be re-routed this way. Returns -EINVAL if there is an argument
+ * problem or if @oh does not have hwmod mux entries or MPU IRQs;
+ * returns -ENOMEM if memory cannot be allocated; or 0 upon success.
+ *
+ * XXX This function interface is fragile. Rather than using array
+ * indexes, which are subject to unpredictable change, it should be
+ * using hwmod IRQ names, and some other stable key for the hwmod mux
+ * pad records.
+ */
+int omap_hwmod_pad_route_irq(struct omap_hwmod *oh, int pad_idx, int irq_idx)
+{
+ int nr_irqs;
+
+ might_sleep();
+
+ if (!oh || !oh->mux || !oh->mpu_irqs || pad_idx < 0 ||
+ pad_idx >= oh->mux->nr_pads_dynamic)
+ return -EINVAL;
+
+ /* Check the number of available mpu_irqs */
+ for (nr_irqs = 0; oh->mpu_irqs[nr_irqs].irq >= 0; nr_irqs++)
+ ;
+
+ if (irq_idx >= nr_irqs)
+ return -EINVAL;
+
+ if (!oh->mux->irqs) {
+ /* XXX What frees this? */
+ oh->mux->irqs = kzalloc(sizeof(int) * oh->mux->nr_pads_dynamic,
+ GFP_KERNEL);
+ if (!oh->mux->irqs)
+ return -ENOMEM;
+ }
+ oh->mux->irqs[pad_idx] = irq_idx;
+
+ return 0;
+}