5b8a14be51
On OMAP4, there is no support to read previous logic state or previous memory state achieved when a power domain transitions to RET. Instead there are module level context registers. In order to support the powerdomain level logic/mem_off_counters on OMAP4, instead use the previous power state achieved (RET) and the *programmed* logic/mem RET state to derive if a powerdomain lost logic or did not. If the powerdomain is programmed to enter RET state and lose logic in RET state, knowing that the powerdomain entered RET is good enough to derive that the logic was lost as well, in such cases. Signed-off-by: Tero Kristo <t-kristo@ti.com> [paul@pwsan.com: removed dependency on functional power state series for now; bumped copyright date] Signed-off-by: Paul Walmsley <paul@pwsan.com>
285 lines
7.6 KiB
C
285 lines
7.6 KiB
C
/*
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* OMAP4 powerdomain control
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*
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* Copyright (C) 2009-2010, 2012 Texas Instruments, Inc.
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* Copyright (C) 2007-2009 Nokia Corporation
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*
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* Derived from mach-omap2/powerdomain.c written by Paul Walmsley
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* Rajendra Nayak <rnayak@ti.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/io.h>
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#include <linux/errno.h>
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#include <linux/delay.h>
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#include <linux/bug.h>
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#include "powerdomain.h"
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#include <plat/prcm.h>
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#include "prm2xxx_3xxx.h"
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#include "prm44xx.h"
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#include "prminst44xx.h"
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#include "prm-regbits-44xx.h"
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static int omap4_pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst)
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{
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omap4_prminst_rmw_inst_reg_bits(OMAP_POWERSTATE_MASK,
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(pwrst << OMAP_POWERSTATE_SHIFT),
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pwrdm->prcm_partition,
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pwrdm->prcm_offs, OMAP4_PM_PWSTCTRL);
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return 0;
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}
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static int omap4_pwrdm_read_next_pwrst(struct powerdomain *pwrdm)
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{
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u32 v;
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v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
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OMAP4_PM_PWSTCTRL);
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v &= OMAP_POWERSTATE_MASK;
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v >>= OMAP_POWERSTATE_SHIFT;
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return v;
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}
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static int omap4_pwrdm_read_pwrst(struct powerdomain *pwrdm)
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{
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u32 v;
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v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
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OMAP4_PM_PWSTST);
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v &= OMAP_POWERSTATEST_MASK;
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v >>= OMAP_POWERSTATEST_SHIFT;
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return v;
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}
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static int omap4_pwrdm_read_prev_pwrst(struct powerdomain *pwrdm)
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{
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u32 v;
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v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
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OMAP4_PM_PWSTST);
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v &= OMAP4430_LASTPOWERSTATEENTERED_MASK;
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v >>= OMAP4430_LASTPOWERSTATEENTERED_SHIFT;
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return v;
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}
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static int omap4_pwrdm_set_lowpwrstchange(struct powerdomain *pwrdm)
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{
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omap4_prminst_rmw_inst_reg_bits(OMAP4430_LOWPOWERSTATECHANGE_MASK,
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(1 << OMAP4430_LOWPOWERSTATECHANGE_SHIFT),
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pwrdm->prcm_partition,
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pwrdm->prcm_offs, OMAP4_PM_PWSTCTRL);
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return 0;
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}
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static int omap4_pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm)
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{
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omap4_prminst_rmw_inst_reg_bits(OMAP4430_LASTPOWERSTATEENTERED_MASK,
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OMAP4430_LASTPOWERSTATEENTERED_MASK,
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pwrdm->prcm_partition,
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pwrdm->prcm_offs, OMAP4_PM_PWSTST);
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return 0;
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}
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static int omap4_pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst)
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{
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u32 v;
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v = pwrst << __ffs(OMAP4430_LOGICRETSTATE_MASK);
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omap4_prminst_rmw_inst_reg_bits(OMAP4430_LOGICRETSTATE_MASK, v,
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pwrdm->prcm_partition, pwrdm->prcm_offs,
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OMAP4_PM_PWSTCTRL);
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return 0;
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}
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static int omap4_pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank,
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u8 pwrst)
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{
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u32 m;
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m = omap2_pwrdm_get_mem_bank_onstate_mask(bank);
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omap4_prminst_rmw_inst_reg_bits(m, (pwrst << __ffs(m)),
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pwrdm->prcm_partition, pwrdm->prcm_offs,
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OMAP4_PM_PWSTCTRL);
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return 0;
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}
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static int omap4_pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank,
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u8 pwrst)
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{
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u32 m;
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m = omap2_pwrdm_get_mem_bank_retst_mask(bank);
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omap4_prminst_rmw_inst_reg_bits(m, (pwrst << __ffs(m)),
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pwrdm->prcm_partition, pwrdm->prcm_offs,
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OMAP4_PM_PWSTCTRL);
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return 0;
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}
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static int omap4_pwrdm_read_logic_pwrst(struct powerdomain *pwrdm)
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{
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u32 v;
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v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
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OMAP4_PM_PWSTST);
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v &= OMAP4430_LOGICSTATEST_MASK;
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v >>= OMAP4430_LOGICSTATEST_SHIFT;
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return v;
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}
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static int omap4_pwrdm_read_logic_retst(struct powerdomain *pwrdm)
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{
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u32 v;
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v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
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OMAP4_PM_PWSTCTRL);
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v &= OMAP4430_LOGICRETSTATE_MASK;
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v >>= OMAP4430_LOGICRETSTATE_SHIFT;
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return v;
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}
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/**
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* omap4_pwrdm_read_prev_logic_pwrst - read the previous logic powerstate
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* @pwrdm: struct powerdomain * to read the state for
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*
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* Reads the previous logic powerstate for a powerdomain. This
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* function must determine the previous logic powerstate by first
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* checking the previous powerstate for the domain. If that was OFF,
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* then logic has been lost. If previous state was RETENTION, the
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* function reads the setting for the next retention logic state to
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* see the actual value. In every other case, the logic is
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* retained. Returns either PWRDM_POWER_OFF or PWRDM_POWER_RET
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* depending whether the logic was retained or not.
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*/
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static int omap4_pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm)
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{
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int state;
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state = omap4_pwrdm_read_prev_pwrst(pwrdm);
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if (state == PWRDM_POWER_OFF)
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return PWRDM_POWER_OFF;
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if (state != PWRDM_POWER_RET)
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return PWRDM_POWER_RET;
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return omap4_pwrdm_read_logic_retst(pwrdm);
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}
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static int omap4_pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
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{
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u32 m, v;
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m = omap2_pwrdm_get_mem_bank_stst_mask(bank);
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v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
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OMAP4_PM_PWSTST);
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v &= m;
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v >>= __ffs(m);
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return v;
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}
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static int omap4_pwrdm_read_mem_retst(struct powerdomain *pwrdm, u8 bank)
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{
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u32 m, v;
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m = omap2_pwrdm_get_mem_bank_retst_mask(bank);
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v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
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OMAP4_PM_PWSTCTRL);
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v &= m;
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v >>= __ffs(m);
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return v;
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}
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/**
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* omap4_pwrdm_read_prev_mem_pwrst - reads the previous memory powerstate
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* @pwrdm: struct powerdomain * to read mem powerstate for
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* @bank: memory bank index
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*
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* Reads the previous memory powerstate for a powerdomain. This
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* function must determine the previous memory powerstate by first
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* checking the previous powerstate for the domain. If that was OFF,
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* then logic has been lost. If previous state was RETENTION, the
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* function reads the setting for the next memory retention state to
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* see the actual value. In every other case, the logic is
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* retained. Returns either PWRDM_POWER_OFF or PWRDM_POWER_RET
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* depending whether logic was retained or not.
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*/
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static int omap4_pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
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{
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int state;
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state = omap4_pwrdm_read_prev_pwrst(pwrdm);
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if (state == PWRDM_POWER_OFF)
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return PWRDM_POWER_OFF;
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if (state != PWRDM_POWER_RET)
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return PWRDM_POWER_RET;
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return omap4_pwrdm_read_mem_retst(pwrdm, bank);
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}
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static int omap4_pwrdm_wait_transition(struct powerdomain *pwrdm)
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{
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u32 c = 0;
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/*
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* REVISIT: pwrdm_wait_transition() may be better implemented
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* via a callback and a periodic timer check -- how long do we expect
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* powerdomain transitions to take?
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*/
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/* XXX Is this udelay() value meaningful? */
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while ((omap4_prminst_read_inst_reg(pwrdm->prcm_partition,
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pwrdm->prcm_offs,
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OMAP4_PM_PWSTST) &
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OMAP_INTRANSITION_MASK) &&
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(c++ < PWRDM_TRANSITION_BAILOUT))
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udelay(1);
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if (c > PWRDM_TRANSITION_BAILOUT) {
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pr_err("powerdomain: %s: waited too long to complete transition\n",
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pwrdm->name);
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return -EAGAIN;
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}
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pr_debug("powerdomain: completed transition in %d loops\n", c);
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return 0;
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}
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struct pwrdm_ops omap4_pwrdm_operations = {
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.pwrdm_set_next_pwrst = omap4_pwrdm_set_next_pwrst,
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.pwrdm_read_next_pwrst = omap4_pwrdm_read_next_pwrst,
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.pwrdm_read_pwrst = omap4_pwrdm_read_pwrst,
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.pwrdm_read_prev_pwrst = omap4_pwrdm_read_prev_pwrst,
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.pwrdm_set_lowpwrstchange = omap4_pwrdm_set_lowpwrstchange,
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.pwrdm_clear_all_prev_pwrst = omap4_pwrdm_clear_all_prev_pwrst,
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.pwrdm_set_logic_retst = omap4_pwrdm_set_logic_retst,
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.pwrdm_read_logic_pwrst = omap4_pwrdm_read_logic_pwrst,
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.pwrdm_read_prev_logic_pwrst = omap4_pwrdm_read_prev_logic_pwrst,
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.pwrdm_read_logic_retst = omap4_pwrdm_read_logic_retst,
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.pwrdm_read_mem_pwrst = omap4_pwrdm_read_mem_pwrst,
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.pwrdm_read_mem_retst = omap4_pwrdm_read_mem_retst,
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.pwrdm_read_prev_mem_pwrst = omap4_pwrdm_read_prev_mem_pwrst,
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.pwrdm_set_mem_onst = omap4_pwrdm_set_mem_onst,
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.pwrdm_set_mem_retst = omap4_pwrdm_set_mem_retst,
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.pwrdm_wait_transition = omap4_pwrdm_wait_transition,
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};
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