/*
* File: arch/blackfin/mach-common/pm.c
* Based on: arm/mach-omap/pm.c
* Author: Cliff Brake <cbrake@accelent.com> Copyright (c) 2001
*
* Created: 2001
* Description: Blackfin power management
*
* Modified: Nicolas Pitre - PXA250 support
* Copyright (c) 2002 Monta Vista Software, Inc.
* David Singleton - OMAP1510
* Copyright (c) 2002 Monta Vista Software, Inc.
* Dirk Behme <dirk.behme@de.bosch.com> - OMAP1510/1610
* Copyright 2004
* Copyright 2004-2008 Analog Devices Inc.
*
* Bugs: Enter bugs at http://blackfin.uclinux.org/
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see the file COPYING, or write
* to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <linux/suspend.h>
#include <linux/sched.h>
#include <linux/proc_fs.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <asm/gpio.h>
#include <asm/dma.h>
#include <asm/dpmc.h>
#ifdef CONFIG_PM_WAKEUP_GPIO_POLAR_H
#define WAKEUP_TYPE PM_WAKE_HIGH
#endif
#ifdef CONFIG_PM_WAKEUP_GPIO_POLAR_L
#define WAKEUP_TYPE PM_WAKE_LOW
#endif
#ifdef CONFIG_PM_WAKEUP_GPIO_POLAR_EDGE_F
#define WAKEUP_TYPE PM_WAKE_FALLING
#endif
#ifdef CONFIG_PM_WAKEUP_GPIO_POLAR_EDGE_R
#define WAKEUP_TYPE PM_WAKE_RISING
#endif
#ifdef CONFIG_PM_WAKEUP_GPIO_POLAR_EDGE_B
#define WAKEUP_TYPE PM_WAKE_BOTH_EDGES
#endif
void bfin_pm_suspend_standby_enter(void)
{
unsigned long flags;
#ifdef CONFIG_PM_WAKEUP_BY_GPIO
gpio_pm_wakeup_request(CONFIG_PM_WAKEUP_GPIO_NUMBER, WAKEUP_TYPE);
#endif
local_irq_save_hw(flags);
bfin_pm_standby_setup();
#ifdef CONFIG_PM_BFIN_SLEEP_DEEPER
sleep_deeper(bfin_sic_iwr[0], bfin_sic_iwr[1], bfin_sic_iwr[2]);
#else
sleep_mode(bfin_sic_iwr[0], bfin_sic_iwr[1], bfin_sic_iwr[2]);
#endif
bfin_pm_standby_restore();
#if defined(CONFIG_BF54x) || defined(CONFIG_BF52x) || defined(CONFIG_BF561) || \
defined(CONFIG_BF538) || defined(CONFIG_BF539) || defined(CONFIG_BF51x)
bfin_write_SIC_IWR0(IWR_DISABLE_ALL);
#if defined(CONFIG_BF52x) || defined(CONFIG_BF51x)
/* BF52x system reset does not properly reset SIC_IWR1 which
* will screw up the bootrom as it relies on MDMA0/1 waking it
* up from IDLE instructions. See this report for more info:
* http://blackfin.uclinux.org/gf/tracker/4323
*/
if (ANOMALY_05000435)
bfin_write_SIC_IWR1(IWR_ENABLE(10) | IWR_ENABLE(11));
else
bfin_write_SIC_IWR1(IWR_DISABLE_ALL);
#else
bfin_write_SIC_IWR1(IWR_DISABLE_ALL);
#endif
# ifdef CONFIG_BF54x
bfin_write_SIC_IWR2(IWR_DISABLE_ALL);
# endif
#else
bfin_write_SIC_IWR(IWR_DISABLE_ALL);
#endif
local_irq_restore_hw(flags);
}
int bf53x_suspend_l1_mem(unsigned char *memptr)
{
dma_memcpy(memptr, (const void *) L1_CODE_START, L1_CODE_LENGTH);
dma_memcpy(memptr + L1_CODE_LENGTH, (const void *) L1_DATA_A_START,
L1_DATA_A_LENGTH);
dma_memcpy(memptr + L1_CODE_LENGTH + L1_DATA_A_LENGTH,
(const void *) L1_DATA_B_START, L1_DATA_B_LENGTH);
memcpy(memptr + L1_CODE_LENGTH + L1_DATA_A_LENGTH +
L1_DATA_B_LENGTH, (const void *) L1_SCRATCH_START,
L1_SCRATCH_LENGTH);
return 0;
}
int bf53x_resume_l1_mem(unsigned char *memptr)
{
dma_memcpy((void *) L1_CODE_START, memptr, L1_CODE_LENGTH);
dma_memcpy((void *) L1_DATA_A_START, memptr + L1_CODE_LENGTH,
L1_DATA_A_LENGTH);
dma_memcpy((void *) L1_DATA_B_START, memptr + L1_CODE_LENGTH +
L1_DATA_A_LENGTH, L1_DATA_B_LENGTH);
memcpy((void *) L1_SCRATCH_START, memptr + L1_CODE_LENGTH +
L1_DATA_A_LENGTH + L1_DATA_B_LENGTH, L1_SCRATCH_LENGTH);
return 0;
}
#ifdef CONFIG_BFIN_WB
static void flushinv_all_dcache(void)
{
u32 way, bank, subbank, set;
u32 status, addr;
u32 dmem_ctl = bfin_read_DMEM_CONTROL();
for (bank = 0; bank < 2; ++bank) {
if (!(dmem_ctl & (1 << (DMC1_P - bank))))
continue;
for (way = 0; way < 2; ++way)
for (subbank = 0; subbank < 4; ++subbank)
for (set = 0; set < 64; ++set) {
bfin_write_DTEST_COMMAND(
way << 26 |
bank << 23 |
subbank << 16 |
set << 5
);
CSYNC();
status = bfin_read_DTEST_DATA0();
/* only worry about valid/dirty entries */
if ((status & 0x3) != 0x3)
continue;
/* construct the address using the tag */
addr = (status & 0xFFFFC800) | (subbank << 12) | (set << 5);
/* flush it */
__asm__ __volatile__("FLUSHINV[%0];" : : "a"(addr));
}
}
}
#endif
static inline void dcache_disable(void)
{
#ifdef CONFIG_BFIN_DCACHE
unsigned long ctrl;
#ifdef CONFIG_BFIN_WB
flushinv_all_dcache();
#endif
SSYNC();
ctrl = bfin_read_DMEM_CONTROL();
ctrl &= ~ENDCPLB;
bfin_write_DMEM_CONTROL(ctrl);
SSYNC();
#endif
}
static inline void dcache_enable(void)
{
#ifdef CONFIG_BFIN_DCACHE
unsigned long ctrl;
SSYNC();
ctrl = bfin_read_DMEM_CONTROL();
ctrl |= ENDCPLB;
bfin_write_DMEM_CONTROL(ctrl);
SSYNC();
#endif
}
static inline void icache_disable(void)
{
#ifdef CONFIG_BFIN_ICACHE
unsigned long ctrl;
SSYNC();
ctrl = bfin_read_IMEM_CONTROL();
ctrl &= ~ENICPLB;
bfin_write_IMEM_CONTROL(ctrl);
SSYNC();
#endif
}
static inline void icache_enable(void)
{
#ifdef CONFIG_BFIN_ICACHE
unsigned long ctrl;
SSYNC();
ctrl = bfin_read_IMEM_CONTROL();
ctrl |= ENICPLB;
bfin_write_IMEM_CONTROL(ctrl);
SSYNC();
#endif
}
int bfin_pm_suspend_mem_enter(void)
{
unsigned long flags;
int wakeup, ret;
unsigned char *memptr = kmalloc(L1_CODE_LENGTH + L1_DATA_A_LENGTH
+ L1_DATA_B_LENGTH + L1_SCRATCH_LENGTH,
GFP_KERNEL);
if (memptr == NULL) {
panic("bf53x_suspend_l1_mem malloc failed");
return -ENOMEM;
}
wakeup = bfin_read_VR_CTL() & ~FREQ;
wakeup |= SCKELOW;
#ifdef CONFIG_PM_BFIN_WAKE_PH6
wakeup |= PHYWE;
#endif
#ifdef CONFIG_PM_BFIN_WAKE_GP
wakeup |= GPWE;
#endif
local_irq_save_hw(flags);
ret = blackfin_dma_suspend();
if (ret) {
local_irq_restore_hw(flags);
kfree(memptr);
return ret;
}
bfin_gpio_pm_hibernate_suspend();
dcache_disable();
icache_disable();
bf53x_suspend_l1_mem(memptr);
do_hibernate(wakeup | vr_wakeup); /* Goodbye */
bf53x_resume_l1_mem(memptr);
icache_enable();
dcache_enable();
bfin_gpio_pm_hibernate_restore();
blackfin_dma_resume();
local_irq_restore_hw(flags);
kfree(memptr);
return 0;
}
/*
* bfin_pm_valid - Tell the PM core that we only support the standby sleep
* state
* @state: suspend state we're checking.
*
*/
static int bfin_pm_valid(suspend_state_t state)
{
return (state == PM_SUSPEND_STANDBY
#ifndef BF533_FAMILY
/*
* On BF533/2/1:
* If we enter Hibernate the SCKE Pin is driven Low,
* so that the SDRAM enters Self Refresh Mode.
* However when the reset sequence that follows hibernate
* state is executed, SCKE is driven High, taking the
* SDRAM out of Self Refresh.
*
* If you reconfigure and access the SDRAM "very quickly",
* you are likely to avoid errors, otherwise the SDRAM
* start losing its contents.
* An external HW workaround is possible using logic gates.
*/
|| state == PM_SUSPEND_MEM
#endif
);
}
/*
* bfin_pm_enter - Actually enter a sleep state.
* @state: State we're entering.
*
*/
static int bfin_pm_enter(suspend_state_t state)
{
switch (state) {
case PM_SUSPEND_STANDBY:
bfin_pm_suspend_standby_enter();
break;
case PM_SUSPEND_MEM:
bfin_pm_suspend_mem_enter();
break;
default:
return -EINVAL;
}
return 0;
}
struct platform_suspend_ops bfin_pm_ops = {
.enter = bfin_pm_enter,
.valid = bfin_pm_valid,
};
static int __init bfin_pm_init(void)
{
suspend_set_ops(&bfin_pm_ops);
return 0;
}
__initcall(bfin_pm_init);
