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linux/arch/arm/mach-omap2/clockdomain2xxx_3xxx.c
Rajendra Nayak 555e74ea08 OMAP2+: clockdomain: Add per clkdm lock to prevent concurrent state programming 
Since the clkdm state programming is now done from within the hwmod
framework (which uses a per-hwmod lock) instead of the being done
from the clock framework (which used a global lock), there is now a
need to have per-clkdm locking to prevent races between different
hwmods/modules belonging to the same clock domain concurrently
programming the clkdm state.

Signed-off-by: Rajendra Nayak <rnayak@ti.com>
Signed-off-by: Benoit Cousson <b-cousson@ti.com>
Cc: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>
2011-07-10 05:56:55 -06:00

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/*
* OMAP2 and OMAP3 clockdomain control
*
* Copyright (C) 2008-2010 Texas Instruments, Inc.
* Copyright (C) 2008-2010 Nokia Corporation
*
* Derived from mach-omap2/clockdomain.c written by Paul Walmsley
* Rajendra Nayak <rnayak@ti.com>
*
* 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.
*/
#include <linux/types.h>
#include <plat/prcm.h>
#include "prm.h"
#include "prm2xxx_3xxx.h"
#include "cm.h"
#include "cm2xxx_3xxx.h"
#include "cm-regbits-24xx.h"
#include "cm-regbits-34xx.h"
#include "prm-regbits-24xx.h"
#include "clockdomain.h"
static int omap2_clkdm_add_wkdep(struct clockdomain *clkdm1,
struct clockdomain *clkdm2)
{
omap2_prm_set_mod_reg_bits((1 << clkdm2->dep_bit),
clkdm1->pwrdm.ptr->prcm_offs, PM_WKDEP);
return 0;
}
static int omap2_clkdm_del_wkdep(struct clockdomain *clkdm1,
struct clockdomain *clkdm2)
{
omap2_prm_clear_mod_reg_bits((1 << clkdm2->dep_bit),
clkdm1->pwrdm.ptr->prcm_offs, PM_WKDEP);
return 0;
}
static int omap2_clkdm_read_wkdep(struct clockdomain *clkdm1,
struct clockdomain *clkdm2)
{
return omap2_prm_read_mod_bits_shift(clkdm1->pwrdm.ptr->prcm_offs,
PM_WKDEP, (1 << clkdm2->dep_bit));
}
static int omap2_clkdm_clear_all_wkdeps(struct clockdomain *clkdm)
{
struct clkdm_dep *cd;
u32 mask = 0;
for (cd = clkdm->wkdep_srcs; cd && cd->clkdm_name; cd++) {
if (!omap_chip_is(cd->omap_chip))
continue;
if (!cd->clkdm)
continue; /* only happens if data is erroneous */
/* PRM accesses are slow, so minimize them */
mask |= 1 << cd->clkdm->dep_bit;
atomic_set(&cd->wkdep_usecount, 0);
}
omap2_prm_clear_mod_reg_bits(mask, clkdm->pwrdm.ptr->prcm_offs,
PM_WKDEP);
return 0;
}
static int omap3_clkdm_add_sleepdep(struct clockdomain *clkdm1,
struct clockdomain *clkdm2)
{
omap2_cm_set_mod_reg_bits((1 << clkdm2->dep_bit),
clkdm1->pwrdm.ptr->prcm_offs,
OMAP3430_CM_SLEEPDEP);
return 0;
}
static int omap3_clkdm_del_sleepdep(struct clockdomain *clkdm1,
struct clockdomain *clkdm2)
{
omap2_cm_clear_mod_reg_bits((1 << clkdm2->dep_bit),
clkdm1->pwrdm.ptr->prcm_offs,
OMAP3430_CM_SLEEPDEP);
return 0;
}
static int omap3_clkdm_read_sleepdep(struct clockdomain *clkdm1,
struct clockdomain *clkdm2)
{
return omap2_prm_read_mod_bits_shift(clkdm1->pwrdm.ptr->prcm_offs,
OMAP3430_CM_SLEEPDEP, (1 << clkdm2->dep_bit));
}
static int omap3_clkdm_clear_all_sleepdeps(struct clockdomain *clkdm)
{
struct clkdm_dep *cd;
u32 mask = 0;
for (cd = clkdm->sleepdep_srcs; cd && cd->clkdm_name; cd++) {
if (!omap_chip_is(cd->omap_chip))
continue;
if (!cd->clkdm)
continue; /* only happens if data is erroneous */
/* PRM accesses are slow, so minimize them */
mask |= 1 << cd->clkdm->dep_bit;
atomic_set(&cd->sleepdep_usecount, 0);
}
omap2_prm_clear_mod_reg_bits(mask, clkdm->pwrdm.ptr->prcm_offs,
OMAP3430_CM_SLEEPDEP);
return 0;
}
static int omap2_clkdm_sleep(struct clockdomain *clkdm)
{
omap2_cm_set_mod_reg_bits(OMAP24XX_FORCESTATE_MASK,
clkdm->pwrdm.ptr->prcm_offs,
OMAP2_PM_PWSTCTRL);
return 0;
}
static int omap2_clkdm_wakeup(struct clockdomain *clkdm)
{
omap2_cm_clear_mod_reg_bits(OMAP24XX_FORCESTATE_MASK,
clkdm->pwrdm.ptr->prcm_offs,
OMAP2_PM_PWSTCTRL);
return 0;
}
static void omap2_clkdm_allow_idle(struct clockdomain *clkdm)
{
if (atomic_read(&clkdm->usecount) > 0)
_clkdm_add_autodeps(clkdm);
omap2xxx_cm_clkdm_enable_hwsup(clkdm->pwrdm.ptr->prcm_offs,
clkdm->clktrctrl_mask);
}
static void omap2_clkdm_deny_idle(struct clockdomain *clkdm)
{
omap2xxx_cm_clkdm_disable_hwsup(clkdm->pwrdm.ptr->prcm_offs,
clkdm->clktrctrl_mask);
if (atomic_read(&clkdm->usecount) > 0)
_clkdm_del_autodeps(clkdm);
}
static void _enable_hwsup(struct clockdomain *clkdm)
{
if (cpu_is_omap24xx())
omap2xxx_cm_clkdm_enable_hwsup(clkdm->pwrdm.ptr->prcm_offs,
clkdm->clktrctrl_mask);
else if (cpu_is_omap34xx())
omap3xxx_cm_clkdm_enable_hwsup(clkdm->pwrdm.ptr->prcm_offs,
clkdm->clktrctrl_mask);
}
static void _disable_hwsup(struct clockdomain *clkdm)
{
if (cpu_is_omap24xx())
omap2xxx_cm_clkdm_disable_hwsup(clkdm->pwrdm.ptr->prcm_offs,
clkdm->clktrctrl_mask);
else if (cpu_is_omap34xx())
omap3xxx_cm_clkdm_disable_hwsup(clkdm->pwrdm.ptr->prcm_offs,
clkdm->clktrctrl_mask);
}
static int omap2_clkdm_clk_enable(struct clockdomain *clkdm)
{
bool hwsup = false;
if (!clkdm->clktrctrl_mask)
return 0;
hwsup = omap2_cm_is_clkdm_in_hwsup(clkdm->pwrdm.ptr->prcm_offs,
clkdm->clktrctrl_mask);
if (hwsup) {
/* Disable HW transitions when we are changing deps */
_disable_hwsup(clkdm);
_clkdm_add_autodeps(clkdm);
_enable_hwsup(clkdm);
} else {
if (clkdm->flags & CLKDM_CAN_FORCE_WAKEUP)
omap2_clkdm_wakeup(clkdm);
}
return 0;
}
static int omap2_clkdm_clk_disable(struct clockdomain *clkdm)
{
bool hwsup = false;
if (!clkdm->clktrctrl_mask)
return 0;
hwsup = omap2_cm_is_clkdm_in_hwsup(clkdm->pwrdm.ptr->prcm_offs,
clkdm->clktrctrl_mask);
if (hwsup) {
/* Disable HW transitions when we are changing deps */
_disable_hwsup(clkdm);
_clkdm_del_autodeps(clkdm);
_enable_hwsup(clkdm);
} else {
if (clkdm->flags & CLKDM_CAN_FORCE_SLEEP)
omap2_clkdm_sleep(clkdm);
}
return 0;
}
static int omap3_clkdm_sleep(struct clockdomain *clkdm)
{
omap3xxx_cm_clkdm_force_sleep(clkdm->pwrdm.ptr->prcm_offs,
clkdm->clktrctrl_mask);
return 0;
}
static int omap3_clkdm_wakeup(struct clockdomain *clkdm)
{
omap3xxx_cm_clkdm_force_wakeup(clkdm->pwrdm.ptr->prcm_offs,
clkdm->clktrctrl_mask);
return 0;
}
static void omap3_clkdm_allow_idle(struct clockdomain *clkdm)
{
if (atomic_read(&clkdm->usecount) > 0)
_clkdm_add_autodeps(clkdm);
omap3xxx_cm_clkdm_enable_hwsup(clkdm->pwrdm.ptr->prcm_offs,
clkdm->clktrctrl_mask);
}
static void omap3_clkdm_deny_idle(struct clockdomain *clkdm)
{
omap3xxx_cm_clkdm_disable_hwsup(clkdm->pwrdm.ptr->prcm_offs,
clkdm->clktrctrl_mask);
if (atomic_read(&clkdm->usecount) > 0)
_clkdm_del_autodeps(clkdm);
}
struct clkdm_ops omap2_clkdm_operations = {
.clkdm_add_wkdep = omap2_clkdm_add_wkdep,
.clkdm_del_wkdep = omap2_clkdm_del_wkdep,
.clkdm_read_wkdep = omap2_clkdm_read_wkdep,
.clkdm_clear_all_wkdeps = omap2_clkdm_clear_all_wkdeps,
.clkdm_sleep = omap2_clkdm_sleep,
.clkdm_wakeup = omap2_clkdm_wakeup,
.clkdm_allow_idle = omap2_clkdm_allow_idle,
.clkdm_deny_idle = omap2_clkdm_deny_idle,
.clkdm_clk_enable = omap2_clkdm_clk_enable,
.clkdm_clk_disable = omap2_clkdm_clk_disable,
};
struct clkdm_ops omap3_clkdm_operations = {
.clkdm_add_wkdep = omap2_clkdm_add_wkdep,
.clkdm_del_wkdep = omap2_clkdm_del_wkdep,
.clkdm_read_wkdep = omap2_clkdm_read_wkdep,
.clkdm_clear_all_wkdeps = omap2_clkdm_clear_all_wkdeps,
.clkdm_add_sleepdep = omap3_clkdm_add_sleepdep,
.clkdm_del_sleepdep = omap3_clkdm_del_sleepdep,
.clkdm_read_sleepdep = omap3_clkdm_read_sleepdep,
.clkdm_clear_all_sleepdeps = omap3_clkdm_clear_all_sleepdeps,
.clkdm_sleep = omap3_clkdm_sleep,
.clkdm_wakeup = omap3_clkdm_wakeup,
.clkdm_allow_idle = omap3_clkdm_allow_idle,
.clkdm_deny_idle = omap3_clkdm_deny_idle,
.clkdm_clk_enable = omap2_clkdm_clk_enable,
.clkdm_clk_disable = omap2_clkdm_clk_disable,
};
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