linux-sg2042/arch/blackfin/mach-common/pm.c

300 lines
6.4 KiB
C

/*
* Blackfin power management
*
* Copyright 2006-2009 Analog Devices Inc.
*
* Licensed under the GPL-2
* based on arm/mach-omap/pm.c
* Copyright 2001, Cliff Brake <cbrake@accelent.com> and others
*/
#include <linux/suspend.h>
#include <linux/sched.h>
#include <linux/proc_fs.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <asm/cplb.h>
#include <asm/gpio.h>
#include <asm/dma.h>
#include <asm/dpmc.h>
#include <asm/pm.h>
#ifdef CONFIG_BF60x
struct bfin_cpu_pm_fns *bfin_cpu_pm;
#endif
void bfin_pm_suspend_standby_enter(void)
{
#if !BFIN_GPIO_PINT
bfin_pm_standby_setup();
#endif
#ifdef CONFIG_BF60x
bfin_cpu_pm->enter(PM_SUSPEND_STANDBY);
#else
# 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
#endif
#if !BFIN_GPIO_PINT
bfin_pm_standby_restore();
#endif
#ifndef CONFIG_BF60x
#ifdef SIC_IWR0
bfin_write_SIC_IWR0(IWR_DISABLE_ALL);
# ifdef SIC_IWR1
/* 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);
# endif
# ifdef SIC_IWR2
bfin_write_SIC_IWR2(IWR_DISABLE_ALL);
# endif
#else
bfin_write_SIC_IWR(IWR_DISABLE_ALL);
#endif
#endif
}
int bf53x_suspend_l1_mem(unsigned char *memptr)
{
dma_memcpy_nocache(memptr, (const void *) L1_CODE_START,
L1_CODE_LENGTH);
dma_memcpy_nocache(memptr + L1_CODE_LENGTH,
(const void *) L1_DATA_A_START, L1_DATA_A_LENGTH);
dma_memcpy_nocache(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_nocache((void *) L1_CODE_START, memptr, L1_CODE_LENGTH);
dma_memcpy_nocache((void *) L1_DATA_A_START, memptr + L1_CODE_LENGTH,
L1_DATA_A_LENGTH);
dma_memcpy_nocache((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;
}
#if defined(CONFIG_BFIN_EXTMEM_WRITEBACK) || defined(CONFIG_BFIN_L2_WRITEBACK)
# ifdef CONFIG_BF60x
__attribute__((l1_text))
# endif
static void flushinv_all_dcache(void)
{
register u32 way, bank, subbank, set;
register 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
int bfin_pm_suspend_mem_enter(void)
{
int ret;
#ifndef CONFIG_BF60x
int wakeup;
#endif
unsigned char *memptr = kmalloc(L1_CODE_LENGTH + L1_DATA_A_LENGTH
+ L1_DATA_B_LENGTH + L1_SCRATCH_LENGTH,
GFP_ATOMIC);
if (memptr == NULL) {
panic("bf53x_suspend_l1_mem malloc failed");
return -ENOMEM;
}
#ifndef CONFIG_BF60x
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
#endif
ret = blackfin_dma_suspend();
if (ret) {
kfree(memptr);
return ret;
}
#ifdef CONFIG_GPIO_ADI
bfin_gpio_pm_hibernate_suspend();
#endif
#if defined(CONFIG_BFIN_EXTMEM_WRITEBACK) || defined(CONFIG_BFIN_L2_WRITEBACK)
flushinv_all_dcache();
#endif
_disable_dcplb();
_disable_icplb();
bf53x_suspend_l1_mem(memptr);
#ifndef CONFIG_BF60x
do_hibernate(wakeup | vr_wakeup); /* See you later! */
#else
bfin_cpu_pm->enter(PM_SUSPEND_MEM);
#endif
bf53x_resume_l1_mem(memptr);
_enable_icplb();
_enable_dcplb();
#ifdef CONFIG_GPIO_ADI
bfin_gpio_pm_hibernate_restore();
#endif
blackfin_dma_resume();
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
#if !(defined(BF533_FAMILY) || defined(CONFIG_BF561))
/*
* 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;
}
#ifdef CONFIG_BFIN_PM_WAKEUP_TIME_BENCH
void bfin_pm_end(void)
{
u32 cycle, cycle2;
u64 usec64;
u32 usec;
__asm__ __volatile__ (
"1: %0 = CYCLES2\n"
"%1 = CYCLES\n"
"%2 = CYCLES2\n"
"CC = %2 == %0\n"
"if ! CC jump 1b\n"
: "=d,a" (cycle2), "=d,a" (cycle), "=d,a" (usec) : : "CC"
);
usec64 = ((u64)cycle2 << 32) + cycle;
do_div(usec64, get_cclk() / USEC_PER_SEC);
usec = usec64;
if (usec == 0)
usec = 1;
pr_info("PM: resume of kernel completes after %ld msec %03ld usec\n",
usec / USEC_PER_MSEC, usec % USEC_PER_MSEC);
}
#endif
static const struct platform_suspend_ops bfin_pm_ops = {
.enter = bfin_pm_enter,
.valid = bfin_pm_valid,
#ifdef CONFIG_BFIN_PM_WAKEUP_TIME_BENCH
.end = bfin_pm_end,
#endif
};
static int __init bfin_pm_init(void)
{
suspend_set_ops(&bfin_pm_ops);
return 0;
}
__initcall(bfin_pm_init);