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/*
* OMAP4 powerdomain control
*
* Copyright (C) 2009-2010 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 <plat/powerdomain.h>
#include <plat/prcm.h>
#include "prm44xx.h"
#include "prm-regbits-44xx.h"
#include "powerdomains.h"
static int omap4_pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst)
{
prm_rmw_mod_reg_bits(OMAP_POWERSTATE_MASK,
(pwrst << OMAP_POWERSTATE_SHIFT),
pwrdm->prcm_offs, OMAP4_PM_PWSTCTRL);
return 0;
}
static int omap4_pwrdm_read_next_pwrst(struct powerdomain *pwrdm)
{
return prm_read_mod_bits_shift(pwrdm->prcm_offs,
OMAP4_PM_PWSTCTRL, OMAP_POWERSTATE_MASK);
}
static int omap4_pwrdm_read_pwrst(struct powerdomain *pwrdm)
{
return prm_read_mod_bits_shift(pwrdm->prcm_offs,
OMAP4_PM_PWSTST, OMAP_POWERSTATEST_MASK);
}
static int omap4_pwrdm_read_prev_pwrst(struct powerdomain *pwrdm)
{
return prm_read_mod_bits_shift(pwrdm->prcm_offs, OMAP4_PM_PWSTST,
OMAP4430_LASTPOWERSTATEENTERED_MASK);
}
static int omap4_pwrdm_set_lowpwrstchange(struct powerdomain *pwrdm)
{
prm_rmw_mod_reg_bits(OMAP4430_LOWPOWERSTATECHANGE_MASK,
(1 << OMAP4430_LOWPOWERSTATECHANGE_SHIFT),
pwrdm->prcm_offs, OMAP4_PM_PWSTCTRL);
return 0;
}
static int omap4_pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm)
{
prm_rmw_mod_reg_bits(OMAP4430_LASTPOWERSTATEENTERED_MASK,
OMAP4430_LASTPOWERSTATEENTERED_MASK,
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);
prm_rmw_mod_reg_bits(OMAP4430_LOGICRETSTATE_MASK, v,
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);
prm_rmw_mod_reg_bits(m, (pwrst << __ffs(m)), 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);
prm_rmw_mod_reg_bits(m, (pwrst << __ffs(m)), pwrdm->prcm_offs,
OMAP4_PM_PWSTCTRL);
return 0;
}
static int omap4_pwrdm_read_logic_pwrst(struct powerdomain *pwrdm)
{
return prm_read_mod_bits_shift(pwrdm->prcm_offs, OMAP4_PM_PWSTST,
OMAP4430_LOGICSTATEST_MASK);
}
static int omap4_pwrdm_read_logic_retst(struct powerdomain *pwrdm)
{
return prm_read_mod_bits_shift(pwrdm->prcm_offs, OMAP4_PM_PWSTCTRL,
OMAP4430_LOGICRETSTATE_MASK);
}
static int omap4_pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
{
u32 m;
m = omap2_pwrdm_get_mem_bank_stst_mask(bank);
return prm_read_mod_bits_shift(pwrdm->prcm_offs, OMAP4_PM_PWSTST, m);
}
static int omap4_pwrdm_read_mem_retst(struct powerdomain *pwrdm, u8 bank)
{
u32 m;
m = omap2_pwrdm_get_mem_bank_retst_mask(bank);
return prm_read_mod_bits_shift(pwrdm->prcm_offs, OMAP4_PM_PWSTCTRL, m);
}
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 ((prm_read_mod_reg(pwrdm->prcm_offs, OMAP4_PM_PWSTST) &
OMAP_INTRANSITION_MASK) &&
(c++ < PWRDM_TRANSITION_BAILOUT))
udelay(1);
if (c > PWRDM_TRANSITION_BAILOUT) {
printk(KERN_ERR "powerdomain: waited too long for "
"powerdomain %s 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_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_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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