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/*
* OMAP4 powerdomain control
*
* Copyright (C) 2009-2010, 2012 Texas Instruments, Inc.
* Copyright (C) 2007-2009 Nokia Corporation
*
* Derived from mach-omap2/powerdomain.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/io.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/bug.h>
#include "powerdomain.h"
#include <plat/prcm.h>
#include "prm2xxx_3xxx.h"
#include "prm44xx.h"
#include "prminst44xx.h"
#include "prm-regbits-44xx.h"
static int omap4_pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst)
{
omap4_prminst_rmw_inst_reg_bits(OMAP_POWERSTATE_MASK,
(pwrst << OMAP_POWERSTATE_SHIFT),
pwrdm->prcm_partition,
pwrdm->prcm_offs, OMAP4_PM_PWSTCTRL);
return 0;
}
static int omap4_pwrdm_read_next_pwrst(struct powerdomain *pwrdm)
{
u32 v;
v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
OMAP4_PM_PWSTCTRL);
v &= OMAP_POWERSTATE_MASK;
v >>= OMAP_POWERSTATE_SHIFT;
return v;
}
static int omap4_pwrdm_read_pwrst(struct powerdomain *pwrdm)
{
u32 v;
v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
OMAP4_PM_PWSTST);
v &= OMAP_POWERSTATEST_MASK;
v >>= OMAP_POWERSTATEST_SHIFT;
return v;
}
static int omap4_pwrdm_read_prev_pwrst(struct powerdomain *pwrdm)
{
u32 v;
v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
OMAP4_PM_PWSTST);
v &= OMAP4430_LASTPOWERSTATEENTERED_MASK;
v >>= OMAP4430_LASTPOWERSTATEENTERED_SHIFT;
return v;
}
static int omap4_pwrdm_set_lowpwrstchange(struct powerdomain *pwrdm)
{
omap4_prminst_rmw_inst_reg_bits(OMAP4430_LOWPOWERSTATECHANGE_MASK,
(1 << OMAP4430_LOWPOWERSTATECHANGE_SHIFT),
pwrdm->prcm_partition,
pwrdm->prcm_offs, OMAP4_PM_PWSTCTRL);
return 0;
}
static int omap4_pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm)
{
omap4_prminst_rmw_inst_reg_bits(OMAP4430_LASTPOWERSTATEENTERED_MASK,
OMAP4430_LASTPOWERSTATEENTERED_MASK,
pwrdm->prcm_partition,
pwrdm->prcm_offs, OMAP4_PM_PWSTST);
return 0;
}
static int omap4_pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst)
{
u32 v;
v = pwrst << __ffs(OMAP4430_LOGICRETSTATE_MASK);
omap4_prminst_rmw_inst_reg_bits(OMAP4430_LOGICRETSTATE_MASK, v,
pwrdm->prcm_partition, pwrdm->prcm_offs,
OMAP4_PM_PWSTCTRL);
return 0;
}
static int omap4_pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank,
u8 pwrst)
{
u32 m;
m = omap2_pwrdm_get_mem_bank_onstate_mask(bank);
omap4_prminst_rmw_inst_reg_bits(m, (pwrst << __ffs(m)),
pwrdm->prcm_partition, pwrdm->prcm_offs,
OMAP4_PM_PWSTCTRL);
return 0;
}
static int omap4_pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank,
u8 pwrst)
{
u32 m;
m = omap2_pwrdm_get_mem_bank_retst_mask(bank);
omap4_prminst_rmw_inst_reg_bits(m, (pwrst << __ffs(m)),
pwrdm->prcm_partition, pwrdm->prcm_offs,
OMAP4_PM_PWSTCTRL);
return 0;
}
static int omap4_pwrdm_read_logic_pwrst(struct powerdomain *pwrdm)
{
u32 v;
v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
OMAP4_PM_PWSTST);
v &= OMAP4430_LOGICSTATEST_MASK;
v >>= OMAP4430_LOGICSTATEST_SHIFT;
return v;
}
static int omap4_pwrdm_read_logic_retst(struct powerdomain *pwrdm)
{
u32 v;
v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
OMAP4_PM_PWSTCTRL);
v &= OMAP4430_LOGICRETSTATE_MASK;
v >>= OMAP4430_LOGICRETSTATE_SHIFT;
return v;
}
/**
* omap4_pwrdm_read_prev_logic_pwrst - read the previous logic powerstate
* @pwrdm: struct powerdomain * to read the state for
*
* Reads the previous logic powerstate for a powerdomain. This
* function must determine the previous logic powerstate by first
* checking the previous powerstate for the domain. If that was OFF,
* then logic has been lost. If previous state was RETENTION, the
* function reads the setting for the next retention logic state to
* see the actual value. In every other case, the logic is
* retained. Returns either PWRDM_POWER_OFF or PWRDM_POWER_RET
* depending whether the logic was retained or not.
*/
static int omap4_pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm)
{
int state;
state = omap4_pwrdm_read_prev_pwrst(pwrdm);
if (state == PWRDM_POWER_OFF)
return PWRDM_POWER_OFF;
if (state != PWRDM_POWER_RET)
return PWRDM_POWER_RET;
return omap4_pwrdm_read_logic_retst(pwrdm);
}
static int omap4_pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
{
u32 m, v;
m = omap2_pwrdm_get_mem_bank_stst_mask(bank);
v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
OMAP4_PM_PWSTST);
v &= m;
v >>= __ffs(m);
return v;
}
static int omap4_pwrdm_read_mem_retst(struct powerdomain *pwrdm, u8 bank)
{
u32 m, v;
m = omap2_pwrdm_get_mem_bank_retst_mask(bank);
v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
OMAP4_PM_PWSTCTRL);
v &= m;
v >>= __ffs(m);
return v;
}
/**
* omap4_pwrdm_read_prev_mem_pwrst - reads the previous memory powerstate
* @pwrdm: struct powerdomain * to read mem powerstate for
* @bank: memory bank index
*
* Reads the previous memory powerstate for a powerdomain. This
* function must determine the previous memory powerstate by first
* checking the previous powerstate for the domain. If that was OFF,
* then logic has been lost. If previous state was RETENTION, the
* function reads the setting for the next memory retention state to
* see the actual value. In every other case, the logic is
* retained. Returns either PWRDM_POWER_OFF or PWRDM_POWER_RET
* depending whether logic was retained or not.
*/
static int omap4_pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
{
int state;
state = omap4_pwrdm_read_prev_pwrst(pwrdm);
if (state == PWRDM_POWER_OFF)
return PWRDM_POWER_OFF;
if (state != PWRDM_POWER_RET)
return PWRDM_POWER_RET;
return omap4_pwrdm_read_mem_retst(pwrdm, bank);
}
static int omap4_pwrdm_wait_transition(struct powerdomain *pwrdm)
{
u32 c = 0;
/*
* REVISIT: pwrdm_wait_transition() may be better implemented
* via a callback and a periodic timer check -- how long do we expect
* powerdomain transitions to take?
*/
/* XXX Is this udelay() value meaningful? */
while ((omap4_prminst_read_inst_reg(pwrdm->prcm_partition,
pwrdm->prcm_offs,
OMAP4_PM_PWSTST) &
OMAP_INTRANSITION_MASK) &&
(c++ < PWRDM_TRANSITION_BAILOUT))
udelay(1);
if (c > PWRDM_TRANSITION_BAILOUT) {
pr_err("powerdomain: %s: waited too long to complete transition\n",
pwrdm->name);
return -EAGAIN;
}
pr_debug("powerdomain: completed transition in %d loops\n", c);
return 0;
}
struct pwrdm_ops omap4_pwrdm_operations = {
.pwrdm_set_next_pwrst = omap4_pwrdm_set_next_pwrst,
.pwrdm_read_next_pwrst = omap4_pwrdm_read_next_pwrst,
.pwrdm_read_pwrst = omap4_pwrdm_read_pwrst,
.pwrdm_read_prev_pwrst = omap4_pwrdm_read_prev_pwrst,
.pwrdm_set_lowpwrstchange = omap4_pwrdm_set_lowpwrstchange,
.pwrdm_clear_all_prev_pwrst = omap4_pwrdm_clear_all_prev_pwrst,
.pwrdm_set_logic_retst = omap4_pwrdm_set_logic_retst,
.pwrdm_read_logic_pwrst = omap4_pwrdm_read_logic_pwrst,
.pwrdm_read_prev_logic_pwrst = omap4_pwrdm_read_prev_logic_pwrst,
.pwrdm_read_logic_retst = omap4_pwrdm_read_logic_retst,
.pwrdm_read_mem_pwrst = omap4_pwrdm_read_mem_pwrst,
.pwrdm_read_mem_retst = omap4_pwrdm_read_mem_retst,
.pwrdm_read_prev_mem_pwrst = omap4_pwrdm_read_prev_mem_pwrst,
.pwrdm_set_mem_onst = omap4_pwrdm_set_mem_onst,
.pwrdm_set_mem_retst = omap4_pwrdm_set_mem_retst,
.pwrdm_wait_transition = omap4_pwrdm_wait_transition,
};
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