/*
* omap_hwmod implementation for OMAP2/3/4
*
* Copyright (C) 2009 Nokia Corporation
*
* Paul Walmsley, Benoît 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.
*
* This code manages "OMAP modules" (on-chip devices) and their
* integration with Linux device driver and bus code.
*
* References:
* - 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:
* - pin mux handling
* - 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 <plat/common.h>
#include <plat/cpu.h>
#include <plat/clockdomain.h>
#include <plat/powerdomain.h>
#include <plat/clock.h>
#include <plat/omap_hwmod.h>
#include "cm.h"
/* Maximum microseconds to wait for OMAP module to reset */
#define MAX_MODULE_RESET_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);
static DEFINE_MUTEX(omap_hwmod_mutex);
/* mpu_oh: used to add/remove MPU initiator from sleepdep list */
static struct omap_hwmod *mpu_oh;
/* inited: 0 if omap_hwmod_init() has not yet been called; 1 otherwise */
static u8 inited;
/* 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_readl(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 */
if (oh->_sysc_cache != v) {
oh->_sysc_cache = v;
omap_hwmod_writel(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 = (0x3 << autoidle_shift);
*v &= ~autoidle_mask;
*v |= autoidle << autoidle_shift;
return 0;
}
/**
* _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, wakeup_mask;
if (!oh->class->sysc ||
!(oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP))
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;
}
wakeup_mask = (0x1 << oh->class->sysc->sysc_fields->enwkup_shift);
v = oh->_sysc_cache;
v |= wakeup_mask;
_write_sysconfig(v, oh);
/* 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, wakeup_mask;
if (!oh->class->sysc ||
!(oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP))
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;
}
wakeup_mask = (0x1 << oh->class->sysc->sysc_fields->enwkup_shift);
v = oh->_sysc_cache;
v &= ~wakeup_mask;
_write_sysconfig(v, oh);
/* 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. 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;
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. 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;
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_clk - 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;
}
/**
* _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 _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 *_find_mpu_rt_base(struct omap_hwmod *oh, u8 index)
{
struct omap_hwmod_ocp_if *os;
struct omap_hwmod_addr_space *mem;
int i;
int found = 0;
void __iomem *va_start;
if (!oh || oh->slaves_cnt == 0)
return NULL;
os = oh->slaves[index];
for (i = 0, mem = os->addr; i < os->addr_cnt; i++, mem++) {
if (mem->flags & ADDR_TYPE_RT) {
found = 1;
break;
}
}
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;
}
/**
* _sysc_enable - 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 _sysc_enable(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) {
idlemode = (oh->flags & HWMOD_SWSUP_MSTANDBY) ?
HWMOD_IDLEMODE_NO : HWMOD_IDLEMODE_SMART;
_set_master_standbymode(oh, idlemode, &v);
}
if (sf & SYSC_HAS_AUTOIDLE) {
idlemode = (oh->flags & HWMOD_NO_OCP_AUTOIDLE) ?
0 : 1;
_set_module_autoidle(oh, idlemode, &v);
}
/* XXX OCP ENAWAKEUP bit? */
/*
* 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);
_write_sysconfig(v, oh);
}
/**
* _sysc_idle - 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 _sysc_idle(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) {
idlemode = (oh->flags & HWMOD_SWSUP_MSTANDBY) ?
HWMOD_IDLEMODE_FORCE : HWMOD_IDLEMODE_SMART;
_set_master_standbymode(oh, idlemode, &v);
}
_write_sysconfig(v, oh);
}
/**
* _sysc_shutdown - force a module into idle via OCP_SYSCONFIG
* @oh: struct omap_hwmod *
*
* Force the module into slave idle and master suspend. No return
* value.
*/
static void _sysc_shutdown(struct omap_hwmod *oh)
{
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.
* Caller must hold omap_hwmod_mutex.
*/
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_clocks - clk_get() all clocks associated with this hwmod
* @oh: struct omap_hwmod *
*
* Called by omap_hwmod_late_init() (after omap2_clk_init()).
* Resolves all clock names embedded in the hwmod. Must be called
* with omap_hwmod_mutex held. Returns -EINVAL if the omap_hwmod
* has not yet been registered or if the clocks have already been
* initialized, 0 on success, or a non-zero error on failure.
*/
static int _init_clocks(struct omap_hwmod *oh)
{
int ret = 0;
if (!oh || (oh->_state != _HWMOD_STATE_REGISTERED))
return -EINVAL;
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);
if (!ret)
oh->_state = _HWMOD_STATE_CLKS_INITED;
return 0;
}
/**
* _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()) {
ret = omap4_cm_wait_module_ready(oh->prcm.omap4.clkctrl_reg);
} else {
BUG();
};
return ret;
}
/**
* _reset - reset an omap_hwmod
* @oh: struct omap_hwmod *
*
* Resets an omap_hwmod @oh via the OCP_SYSCONFIG bit. hwmod must be
* enabled for this to work. Must be called with omap_hwmod_mutex
* held. 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.
*/
static int _reset(struct omap_hwmod *oh)
{
u32 r, v;
int c = 0;
if (!oh->class->sysc ||
!(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET) ||
(oh->class->sysc->sysc_flags & SYSS_MISSING))
return -EINVAL;
/* clocks must be on for this operation */
if (oh->_state != _HWMOD_STATE_ENABLED) {
WARN(1, "omap_hwmod: %s: reset can only be entered from "
"enabled state\n", oh->name);
return -EINVAL;
}
pr_debug("omap_hwmod: %s: resetting\n", oh->name);
v = oh->_sysc_cache;
r = _set_softreset(oh, &v);
if (r)
return r;
_write_sysconfig(v, oh);
omap_test_timeout((omap_hwmod_readl(oh, oh->class->sysc->syss_offs) &
SYSS_RESETDONE_MASK),
MAX_MODULE_RESET_WAIT, c);
if (c == MAX_MODULE_RESET_WAIT)
WARN(1, "omap_hwmod: %s: failed to reset in %d usec\n",
oh->name, MAX_MODULE_RESET_WAIT);
else
pr_debug("omap_hwmod: %s: reset 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()
*/
return (c == MAX_MODULE_RESET_WAIT) ? -ETIMEDOUT : 0;
}
/**
* _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. Must be called with omap_hwmod_mutex held.
* 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;
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;
}
pr_debug("omap_hwmod: %s: enabling\n", oh->name);
/* XXX mux balls */
_add_initiator_dep(oh, mpu_oh);
_enable_clocks(oh);
r = _wait_target_ready(oh);
if (!r) {
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);
_sysc_enable(oh);
}
} else {
pr_debug("omap_hwmod: %s: _wait_target_ready: %d\n",
oh->name, r);
}
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)
{
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;
}
pr_debug("omap_hwmod: %s: idling\n", oh->name);
if (oh->class->sysc)
_sysc_idle(oh);
_del_initiator_dep(oh, mpu_oh);
_disable_clocks(oh);
oh->_state = _HWMOD_STATE_IDLE;
return 0;
}
/**
* _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)
{
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->sysc)
_sysc_shutdown(oh);
_del_initiator_dep(oh, mpu_oh);
/* XXX what about the other system initiators here? DMA, tesla, d2d */
_disable_clocks(oh);
/* XXX Should this code also force-disable the optional clocks? */
/* XXX mux any associated balls to safe mode */
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. Must be called with omap_hwmod_mutex
* held. Returns -EINVAL if the hwmod is in the wrong state or returns
* 0.
*/
static int _setup(struct omap_hwmod *oh)
{
int i, r;
if (!oh)
return -EINVAL;
/* 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;
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)) {
/*
* XXX Do the OCP_SYSCONFIG bits need to be
* reprogrammed after a reset? If not, then this can
* be removed. If they do, then probably the
* _enable() function should be split to avoid the
* rewrite of the OCP_SYSCONFIG register.
*/
if (oh->class->sysc) {
_update_sysc_cache(oh);
_sysc_enable(oh);
}
}
if (!(oh->flags & HWMOD_INIT_NO_IDLE))
_idle(oh);
return 0;
}
/* Public functions */
u32 omap_hwmod_readl(struct omap_hwmod *oh, u16 reg_offs)
{
return __raw_readl(oh->_rt_va + reg_offs);
}
void omap_hwmod_writel(u32 v, struct omap_hwmod *oh, u16 reg_offs)
{
__raw_writel(v, oh->_rt_va + reg_offs);
}
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_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.
*/
int omap_hwmod_register(struct omap_hwmod *oh)
{
int ret, ms_id;
if (!oh || !oh->name || !oh->class || !oh->class->name ||
(oh->_state != _HWMOD_STATE_UNKNOWN))
return -EINVAL;
mutex_lock(&omap_hwmod_mutex);
pr_debug("omap_hwmod: %s: registering\n", oh->name);
if (_lookup(oh->name)) {
ret = -EEXIST;
goto ohr_unlock;
}
ms_id = _find_mpu_port_index(oh);
if (!IS_ERR_VALUE(ms_id)) {
oh->_mpu_port_index = ms_id;
oh->_rt_va = _find_mpu_rt_base(oh, oh->_mpu_port_index);
} else {
oh->_int_flags |= _HWMOD_NO_MPU_PORT;
}
list_add_tail(&oh->node, &omap_hwmod_list);
oh->_state = _HWMOD_STATE_REGISTERED;
ret = 0;
ohr_unlock:
mutex_unlock(&omap_hwmod_mutex);
return ret;
}
/**
* 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;
mutex_lock(&omap_hwmod_mutex);
oh = _lookup(name);
mutex_unlock(&omap_hwmod_mutex);
return oh;
}
/**
* omap_hwmod_for_each - call function for each registered omap_hwmod
* @fn: pointer to a 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))
{
struct omap_hwmod *temp_oh;
int ret;
if (!fn)
return -EINVAL;
mutex_lock(&omap_hwmod_mutex);
list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
ret = (*fn)(temp_oh);
if (ret)
break;
}
mutex_unlock(&omap_hwmod_mutex);
return ret;
}
/**
* omap_hwmod_init - init omap_hwmod code and register 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 -EINVAL if
* omap_hwmod_init() has already been called or 0 otherwise.
*/
int omap_hwmod_init(struct omap_hwmod **ohs)
{
struct omap_hwmod *oh;
int r;
if (inited)
return -EINVAL;
inited = 1;
if (!ohs)
return 0;
oh = *ohs;
while (oh) {
if (omap_chip_is(oh->omap_chip)) {
r = omap_hwmod_register(oh);
WARN(r, "omap_hwmod: %s: omap_hwmod_register returned "
"%d\n", oh->name, r);
}
oh = *++ohs;
}
return 0;
}
/**
* omap_hwmod_late_init - 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.
*/
int omap_hwmod_late_init(void)
{
int r;
/* XXX check return value */
r = omap_hwmod_for_each(_init_clocks);
WARN(r, "omap_hwmod: omap_hwmod_late_init(): _init_clocks failed\n");
mpu_oh = omap_hwmod_lookup(MPU_INITIATOR_NAME);
WARN(!mpu_oh, "omap_hwmod: could not find MPU initiator hwmod %s\n",
MPU_INITIATOR_NAME);
omap_hwmod_for_each(_setup);
return 0;
}
/**
* omap_hwmod_unregister - unregister an omap_hwmod
* @oh: struct omap_hwmod *
*
* Unregisters a previously-registered omap_hwmod @oh. There's probably
* no use case for this, so it is likely to be removed in a later version.
*
* XXX Free all of the bootmem-allocated structures here when that is
* implemented. Make it clear that core code is the only code that is
* expected to unregister modules.
*/
int omap_hwmod_unregister(struct omap_hwmod *oh)
{
if (!oh)
return -EINVAL;
pr_debug("omap_hwmod: %s: unregistering\n", oh->name);
mutex_lock(&omap_hwmod_mutex);
iounmap(oh->_rt_va);
list_del(&oh->node);
mutex_unlock(&omap_hwmod_mutex);
return 0;
}
/**
* omap_hwmod_enable - enable an omap_hwmod
* @oh: struct omap_hwmod *
*
* Enable an omap_hwomd @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;
if (!oh)
return -EINVAL;
mutex_lock(&omap_hwmod_mutex);
r = _enable(oh);
mutex_unlock(&omap_hwmod_mutex);
return r;
}
/**
* omap_hwmod_idle - idle an omap_hwmod
* @oh: struct omap_hwmod *
*
* Idle an omap_hwomd @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)
{
if (!oh)
return -EINVAL;
mutex_lock(&omap_hwmod_mutex);
_idle(oh);
mutex_unlock(&omap_hwmod_mutex);
return 0;
}
/**
* omap_hwmod_shutdown - shutdown an omap_hwmod
* @oh: struct omap_hwmod *
*
* Shutdown an omap_hwomd @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)
{
if (!oh)
return -EINVAL;
mutex_lock(&omap_hwmod_mutex);
_shutdown(oh);
mutex_unlock(&omap_hwmod_mutex);
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)
{
mutex_lock(&omap_hwmod_mutex);
_enable_clocks(oh);
mutex_unlock(&omap_hwmod_mutex);
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)
{
mutex_lock(&omap_hwmod_mutex);
_disable_clocks(oh);
mutex_unlock(&omap_hwmod_mutex);
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_readl(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()/_enable().
*/
int omap_hwmod_reset(struct omap_hwmod *oh)
{
int r;
if (!oh || !(oh->_state & _HWMOD_STATE_ENABLED))
return -EINVAL;
mutex_lock(&omap_hwmod_mutex);
r = _reset(oh);
if (!r)
r = _enable(oh);
mutex_unlock(&omap_hwmod_mutex);
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 = oh->mpu_irqs_cnt + oh->sdma_chs_cnt;
for (i = 0; i < oh->slaves_cnt; i++)
ret += oh->slaves[i]->addr_cnt;
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;
int r = 0;
/* For each IRQ, DMA, memory area, fill in array.*/
for (i = 0; i < oh->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++;
}
for (i = 0; i < oh->sdma_chs_cnt; i++) {
(res + r)->name = (oh->sdma_chs + i)->name;
(res + r)->start = (oh->sdma_chs + i)->dma_ch;
(res + r)->end = (oh->sdma_chs + i)->dma_ch;
(res + r)->flags = IORESOURCE_DMA;
r++;
}
for (i = 0; i < oh->slaves_cnt; i++) {
struct omap_hwmod_ocp_if *os;
os = oh->slaves[i];
for (j = 0; j < os->addr_cnt; j++) {
(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_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)
{
if (!oh->class->sysc ||
!(oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP))
return -EINVAL;
mutex_lock(&omap_hwmod_mutex);
_enable_wakeup(oh);
mutex_unlock(&omap_hwmod_mutex);
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)
{
if (!oh->class->sysc ||
!(oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP))
return -EINVAL;
mutex_lock(&omap_hwmod_mutex);
_disable_wakeup(oh);
mutex_unlock(&omap_hwmod_mutex);
return 0;
}
/**
* 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. Takes
* omap_hwmod_mutex to prevent the hwmod list from changing during the
* iteration. 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);
mutex_lock(&omap_hwmod_mutex);
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;
}
}
mutex_unlock(&omap_hwmod_mutex);
if (ret)
pr_debug("omap_hwmod: %s: iterator terminated early: %d\n",
__func__, ret);
return ret;
}
